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Bigham A, Fasolino I, Borsacchi S, Valente C, Calucci L, Turacchio G, Pannico M, Serrano-Ruiz M, Ambrosio L, Raucci MG. A theragenerative bio-nanocomposite consisting of black phosphorus quantum dots for bone cancer therapy and regeneration. Bioact Mater 2024; 35:99-121. [PMID: 38283385 PMCID: PMC10818087 DOI: 10.1016/j.bioactmat.2024.01.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2023] [Revised: 01/11/2024] [Accepted: 01/18/2024] [Indexed: 01/30/2024] Open
Abstract
Recently, the term theragenerative has been proposed for biomaterials capable of inducing therapeutic approaches followed by repairing/regenerating the tissue/organ. This study is focused on the design of a new theragenerative nanocomposite composed of an amphiphilic non-ionic surfactant (Pluronic F127), bioactive glass (BG), and black phosphorus (BP). The nanocomposite was prepared through a two-step synthetic strategy, including a microwave treatment that turned BP nanosheets (BPNS) into quantum dots (BPQDs) with 5 ± 2 nm dimensions in situ. The effects of surfactant and microwave treatment were assessed in vitro: the surfactant distributes the ions homogenously throughout the composite and the microwave treatment chemically stabilizes the composite. The presence of BP enhanced bioactivity and promoted calcium phosphate formation in simulated body fluid. The inherent anticancer activity of BP-containing nanocomposites was tested against osteosarcoma cells in vitro, finding that 150 μg mL-1 was the lowest concentration which prevented the proliferation of SAOS-2 cells, while the counterpart without BP did not affect the cell growth rate. Moreover, the apoptosis pathways were evaluated and a mechanism of action was proposed. NIR irradiation was applied to induce further proliferation suppression on SAOS-2 cells through hyperthermia. The inhibitory effects of bare BP nanomaterials and nanocomposites on the migration and invasion of bone cancer, breast cancer, and prostate cancer cells were assessed in vitro to determine the anticancer potential of nanomaterials against primary and secondary bone cancers. The regenerative behavior of the nanocomposites was tested with healthy osteoblasts and human mesenchymal stem cells; the BPQDs-incorporated nanocomposite significantly promoted the proliferation of osteoblast cells and induced the osteogenic differentiation of stem cells. This study introduces a new multifunctional theragenerative platform with promising potential for simultaneous bone cancer therapy and regeneration.
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Affiliation(s)
- Ashkan Bigham
- Institute of Polymers, Composites and Biomaterials, National Research Council of Italy (IPCB-CNR), Viale John Fitzgerald Kennedy 54, Mostra d’Oltremare Padiglione 20, 80125, Naples, Italy
- Department of Chemical, Materials and Production Engineering, University of Naples Federico II, Piazzale V. Tecchio 80, 80125, Naples, Italy
| | - Ines Fasolino
- Institute of Polymers, Composites and Biomaterials, National Research Council of Italy (IPCB-CNR), Viale John Fitzgerald Kennedy 54, Mostra d’Oltremare Padiglione 20, 80125, Naples, Italy
| | - Silvia Borsacchi
- Institute for the Chemistry of OrganoMetallic Compounds-ICCOM, Italian National Research Council-CNR, via G. Moruzzi 1, 56124, Pisa, Italy
- Center for Instrument Sharing of the University of Pisa (CISUP), 56126, Pisa, Italy
| | - Carmen Valente
- Institute of Experimental Endocrinology and Oncology “G. Salvatore” (IEOS), National Research Council (CNR), Via Pietro Castellino 111, 80131, Napoli, Italy
| | - Lucia Calucci
- Institute for the Chemistry of OrganoMetallic Compounds-ICCOM, Italian National Research Council-CNR, via G. Moruzzi 1, 56124, Pisa, Italy
- Center for Instrument Sharing of the University of Pisa (CISUP), 56126, Pisa, Italy
| | - Gabriele Turacchio
- Institute of Experimental Endocrinology and Oncology “G. Salvatore” (IEOS), National Research Council (CNR), Via Pietro Castellino 111, 80131, Napoli, Italy
| | - Marianna Pannico
- Institute of Polymers, Composites, and Biomaterials, National Research Council of Italy (IPCB-CNR), Pozzuoli, Italy
| | - Manuel Serrano-Ruiz
- Institute for the Chemistry of OrganoMetallic Compounds-ICCOM, National Research Council-CNR, Sesto Fiorentino, Italy
| | - Luigi Ambrosio
- Institute of Polymers, Composites and Biomaterials, National Research Council of Italy (IPCB-CNR), Viale John Fitzgerald Kennedy 54, Mostra d’Oltremare Padiglione 20, 80125, Naples, Italy
| | - Maria Grazia Raucci
- Institute of Polymers, Composites and Biomaterials, National Research Council of Italy (IPCB-CNR), Viale John Fitzgerald Kennedy 54, Mostra d’Oltremare Padiglione 20, 80125, Naples, Italy
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2
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Landi N, Maurina E, Marongiu D, Simbula A, Borsacchi S, Calucci L, Saba M, Carignani E, Geppi M. Solid-State Nuclear Magnetic Resonance of Triple-Cation Mixed-Halide Perovskites. J Phys Chem Lett 2022; 13:9517-9525. [PMID: 36200785 PMCID: PMC9575147 DOI: 10.1021/acs.jpclett.2c02313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Accepted: 09/15/2022] [Indexed: 06/16/2023]
Abstract
Mixed-cation lead mixed-halide perovskites are the best candidates for perovskite-based photovoltaics, thanks to their higher efficiency and stability compared to the single-cation single-halide parent compounds. TripleMix (Cs0.05MA0.14FA0.81PbI2.55Br0.45 with FA = formamidinium and MA = methylammonium) is one of the most efficient and stable mixed perovskites for single-junction solar cells. The microscopic reasons why triple-cation perovskites perform so well are still under debate. In this work, we investigated the structure and dynamics of TripleMix by exploiting multinuclear solid-state nuclear magnetic resonance (SSNMR), which can provide this information at a level of detail not accessible by other techniques. 133Cs, 13C, 1H, and 207Pb SSNMR spectra confirmed the inclusion of all ions in the perovskite, without phase segregation. Complementary measurements showed a peculiar longitudinal relaxation behavior for the 1H and 207Pb nuclei in TripleMix with respect to single-cation single-halide perovskites, suggesting slower dynamics of both organic cations and halide anions, possibly related to the high photovoltaic performances.
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Affiliation(s)
- Noemi Landi
- Department
of Chemistry and Industrial Chemistry, University
of Pisa, via G. Moruzzi 13, 56124Pisa, Italy
| | - Elena Maurina
- Department
of Chemistry and Industrial Chemistry, University
of Pisa, via G. Moruzzi 13, 56124Pisa, Italy
| | - Daniela Marongiu
- Department
of Physics, University of Cagliari, S.P. Monserrato-Sestu Km. 0700, 09042Monserrato, Cagliari, Italy
| | - Angelica Simbula
- Department
of Physics, University of Cagliari, S.P. Monserrato-Sestu Km. 0700, 09042Monserrato, Cagliari, Italy
| | - Silvia Borsacchi
- Institute
for the Chemistry of OrganoMetallic Compounds - ICCOM, Italian National Research Council - CNR, via G. Moruzzi 1, 56124Pisa, Italy
- Center
for Instrument Sharing, University of Pisa
(CISUP), 56126Pisa, Italy
| | - Lucia Calucci
- Institute
for the Chemistry of OrganoMetallic Compounds - ICCOM, Italian National Research Council - CNR, via G. Moruzzi 1, 56124Pisa, Italy
- Center
for Instrument Sharing, University of Pisa
(CISUP), 56126Pisa, Italy
| | - Michele Saba
- Department
of Physics, University of Cagliari, S.P. Monserrato-Sestu Km. 0700, 09042Monserrato, Cagliari, Italy
| | - Elisa Carignani
- Institute
for the Chemistry of OrganoMetallic Compounds - ICCOM, Italian National Research Council - CNR, via G. Moruzzi 1, 56124Pisa, Italy
| | - Marco Geppi
- Department
of Chemistry and Industrial Chemistry, University
of Pisa, via G. Moruzzi 13, 56124Pisa, Italy
- Institute
for the Chemistry of OrganoMetallic Compounds - ICCOM, Italian National Research Council - CNR, via G. Moruzzi 1, 56124Pisa, Italy
- Center
for Instrument Sharing, University of Pisa
(CISUP), 56126Pisa, Italy
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3
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Vanni M, Provinciali G, Calvo FD, Carignani E, Dreyfuss S, Mézailles N, Mio AM, Nicotra G, Caporali S, Borsacchi S, Peruzzini M, Caporali M. Ru‐P nanoalloy from elemental phosphorus as P‐source: synthesis, characterization and catalytic evaluation. ChemCatChem 2022. [DOI: 10.1002/cctc.202200685] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Matteo Vanni
- ICCOM CNR Firenze: Istituto di Chimica dei Composti Organo Metallici Consiglio Nazionale Delle Ricerche Sezione di Firenze National Research Council ITALY
| | - Giacomo Provinciali
- ICCOM CNR Firenze: Istituto di Chimica dei Composti Organo Metallici Consiglio Nazionale Delle Ricerche Sezione di Firenze National Research Council ITALY
| | - Fuencisla Delgado Calvo
- ICCOM CNR Firenze: Istituto di Chimica dei Composti Organo Metallici Consiglio Nazionale Delle Ricerche Sezione di Firenze National Research Council ITALY
| | - Elisa Carignani
- ICCOM CNR Pisa: Istituto di Chimica dei Composti Organo Metallici Consiglio Nazionale delle Ricerche Sezione di Pisa National Research Council ITALY
| | - Sébastien Dreyfuss
- Universite Paul Sabatier: Universite Toulouse III Paul Sabatier Laboratoire Hétérochimie Fondamentale et Appliquée FRANCE
| | - Nicolas Mézailles
- University of Toulouse: Universite Federale Toulouse Midi-Pyrenees Laboratoire Hétérochimie Fondamentale et Appliquée FRANCE
| | - Antonio Massimiliano Mio
- IMM CNR: Istituto per la Microelettronica e Microsistemi Consiglio Nazionale delle Ricerche National Research Council ITALY
| | - Giuseppe Nicotra
- IMM CNR: Istituto per la Microelettronica e Microsistemi Consiglio Nazionale delle Ricerche National Research Council ITALY
| | - Stefano Caporali
- University of Florence: Universita degli Studi di Firenze Department of Industrial Engineering ITALY
| | - Silvia Borsacchi
- ICCOM CNR Pisa: Istituto di Chimica dei Composti Organo Metallici Consiglio Nazionale delle Ricerche Sezione di Pisa National Research Council ITALY
| | - Maurizio Peruzzini
- ICCOM CNR Firenze: Istituto di Chimica dei Composti Organo Metallici Consiglio Nazionale Delle Ricerche Sezione di Firenze National Research Council ITALY
| | - Maria Caporali
- National Research Council Institute of Chemistry of Organometallic Compounds Via Madonna del Piano 10 50019 Sesto Fiorentino ITALY
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Hossain K, Florean L, Del Tedesco A, Cattaruzza E, Geppi M, Borsacchi S, Canton P, Benedetti A, Riello P, Scarso A. Modification of Amorphous Mesoporous Zirconia Nanoparticles with Bisphosphonic Acids: A Straightforward Approach for Tailoring the Surface Properties of the Nanoparticles. Chemistry 2021; 27:17941-17951. [PMID: 34705317 PMCID: PMC9299609 DOI: 10.1002/chem.202103354] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Indexed: 12/02/2022]
Abstract
The use of readily prepared bisphosphonic acids obtained in few steps through a thio‐Michael addition of commercially available thiols on tetraethyl vinylidenebisphosphonate enables the straightforward surface modification of amorphous mesoporous zirconia nanoparticles. Simple stirring of the zirconia nanoparticles in a buffered aqueous solution of the proper bisphosphonic acid leads to the surface functionalization of the nanoparticles with different kinds of functional groups, charge and hydrophobic properties. Formation of both chemisorbed and physisorbed layers of the bisphosphonic acid take place, observing after extensive washing a grafting density of 1.1 molecules/nm2 with negligible release in neutral or acidic pH conditions, demonstrating stronger loading compared to monophosphonate derivatives. The modified nanoparticles were characterized by IR, XPS, ζ‐potential analysis to investigate the loading of the bisphosphonic acid, FE‐SEM to investigate the size and morphologies of the nanoparticles and 31P and 1H MAS NMR to investigate the coordination motif of the phosphonate units on the surface. All these analytical techniques demonstrated the strong affinity of the bisphosphonic moiety for the Zr(IV) metal centers. The functionalization with bisphosphonic acids represents a straightforward covalent approach for tailoring the superficial properties of zirconia nanoparticles, much straightforward compared the classic use of trisalkoxysilane or trichlorosilane reagents typically employed for the functionalization of silica and metal oxide nanoparticles. Extension of the use of bisphosphonates to other metal oxide nanoparticles is advisable.
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Affiliation(s)
- Khohinur Hossain
- Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca' Foscari Venezia, Via Torino 155, 30172, Venezia Mestre, Italy
| | - Luca Florean
- Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca' Foscari Venezia, Via Torino 155, 30172, Venezia Mestre, Italy
| | - Anna Del Tedesco
- Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca' Foscari Venezia, Via Torino 155, 30172, Venezia Mestre, Italy
| | - Elti Cattaruzza
- Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca' Foscari Venezia, Via Torino 155, 30172, Venezia Mestre, Italy
| | - Marco Geppi
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, via G. Moruzzi 13, 56124, Pisa, Italy
| | | | - Patrizia Canton
- Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca' Foscari Venezia, Via Torino 155, 30172, Venezia Mestre, Italy
| | - Alvise Benedetti
- Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca' Foscari Venezia, Via Torino 155, 30172, Venezia Mestre, Italy
| | - Pietro Riello
- Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca' Foscari Venezia, Via Torino 155, 30172, Venezia Mestre, Italy
| | - Alessandro Scarso
- Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca' Foscari Venezia, Via Torino 155, 30172, Venezia Mestre, Italy
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Vanni M, Bellini M, Borsacchi S, Calucci L, Caporali M, Caporali S, d'Acapito F, Geppi M, Giaccherini A, Ienco A, Manca G, Mio AM, Nicotra G, Oberhauser W, Serrano-Ruiz M, Banchelli M, Vizza F, Peruzzini M. Interlayer Coordination of Pd-Pd Units in Exfoliated Black Phosphorus. J Am Chem Soc 2021; 143:10088-10098. [PMID: 34185506 PMCID: PMC9295127 DOI: 10.1021/jacs.1c01754] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
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The chemical functionalization of
2D exfoliated black phosphorus
(2D BP) continues to attract great interest, although a satisfactory
structural characterization of the functionalized material has seldom
been achieved. Herein, we provide the first complete structural characterization
of 2D BP functionalized with rare discrete Pd2 units, obtained
through a mild decomposition of the organometallic dimeric precursor
[Pd(η3-C3H5)Cl]2. A multitechnique approach, including HAADF-STEM, solid-state NMR,
XPS, and XAS, was used to study in detail the morphology of the palladated
nanosheets (Pd2/BP) and to unravel the coordination of
Pd2 units to phosphorus atoms of 2D BP. In particular,
XAS, backed up by DFT modeling, revealed the existence of unprecedented
interlayer Pd–Pd units, sandwiched between stacked BP layers.
The preliminary application of Pd2/BP as a catalyst for
the hydrogen evolution reaction (HER) in acidic medium highlighted
an activity increase due to the presence of Pd2 units.
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Affiliation(s)
- Matteo Vanni
- Institute for the Chemistry of Organometallic Compounds (CNR-ICCOM), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy.,Department of Biotechnology, Chemistry and Pharmacy, University of Siena, 53100 Siena, Italy
| | - Marco Bellini
- Institute for the Chemistry of Organometallic Compounds (CNR-ICCOM), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy
| | - Silvia Borsacchi
- Institute for the Chemistry of Organometallic Compounds (CNR-ICCOM), SS Pisa, Via Moruzzi 1, 56124 Pisa, Italy.,Center for Instrument Sharing of the University of Pisa (CISUP), Lungarno Pacinotti 43/44, 56126 Pisa, Italy
| | - Lucia Calucci
- Institute for the Chemistry of Organometallic Compounds (CNR-ICCOM), SS Pisa, Via Moruzzi 1, 56124 Pisa, Italy.,Center for Instrument Sharing of the University of Pisa (CISUP), Lungarno Pacinotti 43/44, 56126 Pisa, Italy
| | - Maria Caporali
- Institute for the Chemistry of Organometallic Compounds (CNR-ICCOM), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy
| | - Stefano Caporali
- Department of Industrial Engineering, University of Florence, Via di S. Marta 3, 50139 Firenze, Italy
| | - Francesco d'Acapito
- CNR-IOM-OGG c/o European Synchrotron Radiation Facility, 71 Avenue des Martyrs, CS 40220, 38043 Grenoble Cedex 9, France
| | - Marco Geppi
- Center for Instrument Sharing of the University of Pisa (CISUP), Lungarno Pacinotti 43/44, 56126 Pisa, Italy.,Department of Chemistry and Industrial Chemistry (DCCI), University of Pisa, Via Moruzzi 13, 56121 Pisa, Italy
| | - Andrea Giaccherini
- Department of Earth Sciences, University of Florence, Via La Pira 4, 50121 Firenze, Italy
| | - Andrea Ienco
- Institute for the Chemistry of Organometallic Compounds (CNR-ICCOM), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy
| | - Gabriele Manca
- Institute for the Chemistry of Organometallic Compounds (CNR-ICCOM), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy
| | - Antonio Massimiliano Mio
- Institute for Microelectronics and Microsystems (CNR-IMM), VIII strada 5, I-95121 Catania, Italy
| | - Giuseppe Nicotra
- Institute for Microelectronics and Microsystems (CNR-IMM), VIII strada 5, I-95121 Catania, Italy
| | - Werner Oberhauser
- Institute for the Chemistry of Organometallic Compounds (CNR-ICCOM), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy
| | - Manuel Serrano-Ruiz
- Institute for the Chemistry of Organometallic Compounds (CNR-ICCOM), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy
| | - Martina Banchelli
- Institute of Applied Physics "Nello Carrara" (CNR-IFAC), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy
| | - Francesco Vizza
- Institute for the Chemistry of Organometallic Compounds (CNR-ICCOM), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy
| | - Maurizio Peruzzini
- Institute for the Chemistry of Organometallic Compounds (CNR-ICCOM), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy
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Nardelli F, Martini F, Carignani E, Rossi E, Borsacchi S, Cettolin M, Susanna A, Arimondi M, Giannini L, Geppi M, Calucci L. Glassy and Polymer Dynamics of Elastomers by 1H-Field-Cycling NMR Relaxometry: Effects of Fillers. J Phys Chem B 2021; 125:4546-4554. [PMID: 33885314 PMCID: PMC8279540 DOI: 10.1021/acs.jpcb.1c00885] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Revised: 04/07/2021] [Indexed: 11/30/2022]
Abstract
1H spin-lattice relaxation rate (R1) dispersions were acquired by field-cycling (FC) NMR relaxometry between 0.01 and 35 MHz over a wide temperature range on polyisoprene rubber (IR), either unfilled or filled with different amounts of carbon black, silica, or a combination of both, and sulfur cured. By exploiting the frequency-temperature superposition principle and constructing master curves for the total FC NMR susceptibility, χ″(ω) = ωR1(ω), the correlation times for glassy dynamics, τs, were determined. Moreover, the contribution of polymer dynamics, χpol″(ω), to χ″(ω) was singled out by subtracting the contribution of glassy dynamics, χglass″(ω), well represented by the Cole-Davidson spectral density. Glassy dynamics resulted moderately modified by the presence of fillers, τs values determined for the filled rubbers being slightly different from those of the unfilled one. Polymer dynamics was affected by the presence of fillers in the Rouse regime. A change in the frequency dependence of χpol″(ω) at low frequencies was observed for all filled rubbers, more pronounced for those reinforced with silica, which suggests that the presence of the filler particles can affect chain conformations, resulting in a different Rouse mode distribution, and/or interchain interactions modulated by translational motions.
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Affiliation(s)
- Francesca Nardelli
- Dipartimento
di Chimica e Chimica Industriale, Università
di Pisa, via G. Moruzzi 13, 56124 Pisa, Italy
- Istituto
di Chimica dei Composti OrganoMetallici, Consiglio Nazionale delle
Ricerche, via G. Moruzzi
1, 56124 Pisa, Italy
| | - Francesca Martini
- Dipartimento
di Chimica e Chimica Industriale, Università
di Pisa, via G. Moruzzi 13, 56124 Pisa, Italy
- Istituto
di Chimica dei Composti OrganoMetallici, Consiglio Nazionale delle
Ricerche, via G. Moruzzi
1, 56124 Pisa, Italy
- Centro
per l’Integrazione della Strumentazione Scientifica dell’Università
di Pisa (CISUP), Lungarno
Pacinotti 43, 56126 Pisa, Italy
| | - Elisa Carignani
- Dipartimento
di Chimica e Chimica Industriale, Università
di Pisa, via G. Moruzzi 13, 56124 Pisa, Italy
- Istituto
di Chimica dei Composti OrganoMetallici, Consiglio Nazionale delle
Ricerche, via G. Moruzzi
1, 56124 Pisa, Italy
| | - Elena Rossi
- Dipartimento
di Chimica e Chimica Industriale, Università
di Pisa, via G. Moruzzi 13, 56124 Pisa, Italy
| | - Silvia Borsacchi
- Istituto
di Chimica dei Composti OrganoMetallici, Consiglio Nazionale delle
Ricerche, via G. Moruzzi
1, 56124 Pisa, Italy
- Centro
per l’Integrazione della Strumentazione Scientifica dell’Università
di Pisa (CISUP), Lungarno
Pacinotti 43, 56126 Pisa, Italy
| | | | | | | | - Luca Giannini
- Pirelli
Tyre SpA, Viale Sarca 222, 20126 Milano, Italy
| | - Marco Geppi
- Dipartimento
di Chimica e Chimica Industriale, Università
di Pisa, via G. Moruzzi 13, 56124 Pisa, Italy
- Istituto
di Chimica dei Composti OrganoMetallici, Consiglio Nazionale delle
Ricerche, via G. Moruzzi
1, 56124 Pisa, Italy
- Centro
per l’Integrazione della Strumentazione Scientifica dell’Università
di Pisa (CISUP), Lungarno
Pacinotti 43, 56126 Pisa, Italy
| | - Lucia Calucci
- Istituto
di Chimica dei Composti OrganoMetallici, Consiglio Nazionale delle
Ricerche, via G. Moruzzi
1, 56124 Pisa, Italy
- Centro
per l’Integrazione della Strumentazione Scientifica dell’Università
di Pisa (CISUP), Lungarno
Pacinotti 43, 56126 Pisa, Italy
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7
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Gelli R, Martini F, Geppi M, Borsacchi S, Ridi F, Baglioni P. Exploring the interplay of mucin with biologically-relevant amorphous magnesium-calcium phosphate nanoparticles. J Colloid Interface Sci 2021; 594:802-811. [PMID: 33794402 DOI: 10.1016/j.jcis.2021.03.062] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Revised: 02/01/2021] [Accepted: 03/11/2021] [Indexed: 10/21/2022]
Abstract
HYPOTHESIS It has been recently shown that, in our organism, the secretions of Ca2+, Mg2+ and phosphate ions lead to the precipitation of amorphous magnesium-calcium phosphate nanoparticles (AMCPs) in the small intestine, where the glycoprotein mucin is one of the most abundant proteins, being the main component of the mucus hydrogel layer covering gut epithelium. Since AMCPs precipitate in vivo in a mucin-rich environment, we aim at studying the effect of this glycoprotein on the formation and features of endogenous-like AMCPs. EXPERIMENTS AMCPs were synthesized from aqueous solution in the presence of different concentrations of mucin, and the obtained particles were characterised in terms of crystallinity, composition and morphology. Solid State NMR investigation was also performed in order to assess the interplay between mucin and AMCPs at a sub-nanometric level. FINDING Results show that AMCPs form in the presence of mucin and the glycoprotein is efficiently incorporated in the amorphous particles. NMR indicates the existence of interactions between AMCPs and mucin, revealing how AMCPs in mucin-hybrid nanoparticles affect the features of both proteic and oligosaccharidic portions of the glycoprotein. Considering that the primary function of mucin is the protection of the intestine from pathogens, we speculate that the nature of the interaction between AMCPs and mucin described in the present work might be relevant to the immune system, suggesting a novel type of scenario which could be investigated by combining physico-chemical and biomedical approaches.
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Affiliation(s)
- Rita Gelli
- Department of Chemistry "Ugo Schiff" and CSGI, University of Florence, via della Lastruccia 3, 50019 Sesto Fiorentino, Florence, Italy
| | - Francesca Martini
- Department of Chemistry and Industrial Chemistry, University of Pisa, via G. Moruzzi 13, Pisa 56124, Italy; Center for Instrument Sharing of the University of Pisa (CISUP), Lungarno Pacinotti 43/44, 56126 Pisa, Italy
| | - Marco Geppi
- Department of Chemistry and Industrial Chemistry, University of Pisa, via G. Moruzzi 13, Pisa 56124, Italy; Center for Instrument Sharing of the University of Pisa (CISUP), Lungarno Pacinotti 43/44, 56126 Pisa, Italy
| | - Silvia Borsacchi
- Institute for the Chemistry of OrganoMetallic Compounds, Italian National Council for Research, CNR-ICCOM Pisa, via G. Moruzzi 1, Pisa 56124, Italy; Center for Instrument Sharing of the University of Pisa (CISUP), Lungarno Pacinotti 43/44, 56126 Pisa, Italy.
| | - Francesca Ridi
- Department of Chemistry "Ugo Schiff" and CSGI, University of Florence, via della Lastruccia 3, 50019 Sesto Fiorentino, Florence, Italy.
| | - Piero Baglioni
- Department of Chemistry "Ugo Schiff" and CSGI, University of Florence, via della Lastruccia 3, 50019 Sesto Fiorentino, Florence, Italy
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8
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Martini F, Carignani E, Nardelli F, Rossi E, Borsacchi S, Cettolin M, Susanna A, Geppi M, Calucci L. Glassy and Polymer Dynamics of Elastomers by 1H Field-Cycling NMR Relaxometry: Effects of Cross-Linking. Macromolecules 2020; 53:10028-10039. [PMID: 33250523 PMCID: PMC7690040 DOI: 10.1021/acs.macromol.0c01439] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Revised: 10/20/2020] [Indexed: 11/28/2022]
Abstract
![]()
1H spin lattice relaxation
rate (R1) dispersions were acquired by
field-cycling (FC) NMR relaxometry
between 0.01 and 35 MHz over a wide temperature range on polyisoprene
(IR), polybutadiene (BR), and poly(styrene-co-butadiene)
(SBR) rubbers, obtained by vulcanization under different conditions,
and on the corresponding uncured elastomers. By exploiting the frequency–temperature
superposition principle, χ″(ωτs) master curves were constructed by shifting the total FC NMR susceptibility,
χ″(ω) = ωR1(ω),
curves along the frequency axis by the correlation times for glassy
dynamics, τs. Longer τs values and,
correspondingly, higher glass transition temperatures were determined
for the sulfur-cured elastomers with respect to the uncured ones,
which increased by increasing the cross-link density, whereas no significant
changes were found for fragility. The contribution of polymer dynamics,
χpol″(ω), to χ″(ω)
was singled out by subtracting the contribution of glassy dynamics,
χglass″(ω), well represented using a
Cole–Davidson spectral density. For all elastomers, χpol″(ω) was found to represent a small fraction, on the order of
0.05–0.14, of the total χ″(ω), which did
not show a significant dependence on cross-link density. In the investigated
temperature and frequency ranges, polymer dynamics was found to encompass
regimes I (Rouse dynamics) and II (constrained Rouse dynamics) of
the tube reptation model for the uncured elastomers and only regime
I for the vulcanized ones. This is clear evidence that chemical cross-links
impose constraints on chain dynamics on a larger space and time scale
than free Rouse modes.
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Affiliation(s)
- Francesca Martini
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via G. Moruzzi 13, 56124 Pisa, Italy.,Istituto di Chimica dei Composti OrganoMetallici, Consiglio Nazionale Delle Ricerche, Via G. Moruzzi 1, 56124 Pisa, Italy
| | - Elisa Carignani
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via G. Moruzzi 13, 56124 Pisa, Italy.,Istituto di Chimica dei Composti OrganoMetallici, Consiglio Nazionale Delle Ricerche, Via G. Moruzzi 1, 56124 Pisa, Italy
| | - Francesca Nardelli
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via G. Moruzzi 13, 56124 Pisa, Italy.,Istituto di Chimica dei Composti OrganoMetallici, Consiglio Nazionale Delle Ricerche, Via G. Moruzzi 1, 56124 Pisa, Italy
| | - Elena Rossi
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via G. Moruzzi 13, 56124 Pisa, Italy
| | - Silvia Borsacchi
- Istituto di Chimica dei Composti OrganoMetallici, Consiglio Nazionale Delle Ricerche, Via G. Moruzzi 1, 56124 Pisa, Italy
| | | | | | - Marco Geppi
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via G. Moruzzi 13, 56124 Pisa, Italy.,Istituto di Chimica dei Composti OrganoMetallici, Consiglio Nazionale Delle Ricerche, Via G. Moruzzi 1, 56124 Pisa, Italy
| | - Lucia Calucci
- Istituto di Chimica dei Composti OrganoMetallici, Consiglio Nazionale Delle Ricerche, Via G. Moruzzi 1, 56124 Pisa, Italy
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9
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Abstract
Abstract
In this paper, different aspects concerning anisotropy in Nuclear Magnetic Resonance (NMR) spectroscopy have been reviewed. In particular, the relevant theory has been presented, showing how anisotropy stems from the dependence of internal nuclear spin interactions on the molecular orientation with respect to the external magnetic field direction. The consequences of anisotropy in the use of NMR spectroscopy have been critically discussed: on one side, the availability of very detailed structural and dynamic information, and on the other side, the loss of spectral resolution. The experiments used to measure the anisotropic properties in solid and soft materials, where, in contrast to liquids, such properties are not averaged out by the molecular tumbling, have been described. Such experiments can be based either on static low-resolution techniques or on one- and two-dimensional pulse sequences exploiting Magic Angle Spinning (MAS). Examples of applications of NMR spectroscopy have been shown, which exploit anisotropy to obtain important physico-chemical information on several categories of systems, including pharmaceuticals, inorganic materials, polymers, liquid crystals, and self-assembling amphiphiles in water. Solid-state NMR spectroscopy can be considered, nowadays, one of the most powerful characterization techniques for all kinds of solid, either amorphous or crystalline, and semi-solid systems for the obtainment of both structural and dynamic properties on a molecular and supra-molecular scale.
Graphic abstract
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10
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Martini F, Borsacchi S, Barcaro G, Caporali M, Vanni M, Serrano-Ruiz M, Geppi M, Peruzzini M, Calucci L. Phosphorene and Black Phosphorus: The 31P NMR View. J Phys Chem Lett 2019; 10:5122-5127. [PMID: 31411891 DOI: 10.1021/acs.jpclett.9b01788] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
This work aims at characterizing for the first time the 31P spin interactions determining the nuclear magnetic resonance (NMR) properties of solid black phosphorus (bP) and of its few-layer exfoliated form (fl-bP). Indeed, the knowledge of these properties is still very poor, despite the great interest received by this layered phosphorus allotrope and its exfoliated 2D form, phosphorene. By combining density functional theory (DFT) calculations and solid-state NMR experiments on suspensions of fl-bP nanoflakes and on solid bP, it has been possible to characterize the 31P homonuclear dipolar and chemical shift interactions, identifying the network of 31P nuclei more strongly dipolarly coupled and highlighting two kinds of magnetically nonequivalent 31P nuclei. These results add an important missing piece of information to the fundamental chemico-physical knowledge of bP and support future extensive applications of NMR spectroscopy to the characterization of phosphorene-based materials.
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Affiliation(s)
- Francesca Martini
- Department of Chemistry and Industrial Chemistry, University of Pisa, via G. Moruzzi 13, I-56124 Pisa, Italy
- Institute for the Chemistry of OrganoMetallic Compounds, Italian National Council for Research, CNR-ICCOM, via G. Moruzzi 1, I-56124 Pisa, Italy
| | - Silvia Borsacchi
- Institute for the Chemistry of OrganoMetallic Compounds, Italian National Council for Research, CNR-ICCOM, via G. Moruzzi 1, I-56124 Pisa, Italy
| | - Giovanni Barcaro
- Institute for the Physico-Chemical Processes, Italian National Council for Research, CNR-IPCF, via G. Moruzzi 1, I-56124 Pisa, Italy
| | - Maria Caporali
- Institute for the Chemistry of OrganoMetallic Compounds, Italian National Council for Research, CNR-ICCOM, Via Madonna del Piano 10, I-50019 Sesto Fiorentino, Italy
| | - Matteo Vanni
- Institute for the Chemistry of OrganoMetallic Compounds, Italian National Council for Research, CNR-ICCOM, Via Madonna del Piano 10, I-50019 Sesto Fiorentino, Italy
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, via Aldo Moro 2, I-53100 Siena, Italy
| | - Manuel Serrano-Ruiz
- Institute for the Chemistry of OrganoMetallic Compounds, Italian National Council for Research, CNR-ICCOM, Via Madonna del Piano 10, I-50019 Sesto Fiorentino, Italy
| | - Marco Geppi
- Department of Chemistry and Industrial Chemistry, University of Pisa, via G. Moruzzi 13, I-56124 Pisa, Italy
- Institute for the Chemistry of OrganoMetallic Compounds, Italian National Council for Research, CNR-ICCOM, via G. Moruzzi 1, I-56124 Pisa, Italy
| | - Maurizio Peruzzini
- Institute for the Chemistry of OrganoMetallic Compounds, Italian National Council for Research, CNR-ICCOM, Via Madonna del Piano 10, I-50019 Sesto Fiorentino, Italy
| | - Lucia Calucci
- Institute for the Chemistry of OrganoMetallic Compounds, Italian National Council for Research, CNR-ICCOM, via G. Moruzzi 1, I-56124 Pisa, Italy
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11
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Martini F, Guazzelli E, Martinelli E, Borsacchi S, Geppi M, Galli G. Molecular Dynamics of Amphiphilic Random Copolymers in the Bulk: A
1
H and
19
F NMR Relaxometry Study. MACROMOL CHEM PHYS 2019. [DOI: 10.1002/macp.201900177] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Francesca Martini
- Dipartimento di Chimica e Chimica Industriale Università di Pisa via G. Moruzzi 13 56124 Pisa Italy
- Consiglio Nazionale delle Ricerche–CNR Istituto di Chimica dei Composti OrganoMetallici Sede Secondaria di Pisa via G. Moruzzi 1 56124 Pisa Italy
| | - Elisa Guazzelli
- Dipartimento di Chimica e Chimica Industriale Università di Pisa via G. Moruzzi 13 56124 Pisa Italy
| | - Elisa Martinelli
- Dipartimento di Chimica e Chimica Industriale Università di Pisa via G. Moruzzi 13 56124 Pisa Italy
| | - Silvia Borsacchi
- Consiglio Nazionale delle Ricerche–CNR Istituto di Chimica dei Composti OrganoMetallici Sede Secondaria di Pisa via G. Moruzzi 1 56124 Pisa Italy
| | - Marco Geppi
- Dipartimento di Chimica e Chimica Industriale Università di Pisa via G. Moruzzi 13 56124 Pisa Italy
- Consiglio Nazionale delle Ricerche–CNR Istituto di Chimica dei Composti OrganoMetallici Sede Secondaria di Pisa via G. Moruzzi 1 56124 Pisa Italy
| | - Giancarlo Galli
- Dipartimento di Chimica e Chimica Industriale Università di Pisa via G. Moruzzi 13 56124 Pisa Italy
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12
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Bolognesi M, Moschetto S, Trapani M, Prescimone F, Ferroni C, Manca G, Ienco A, Borsacchi S, Caporali M, Muccini M, Peruzzini M, Serrano-Ruiz M, Calucci L, Castriciano MA, Toffanin S. Noncovalent Functionalization of 2D Black Phosphorus with Fluorescent Boronic Derivatives of Pyrene for Probing and Modulating the Interaction with Molecular Oxygen. ACS Appl Mater Interfaces 2019; 11:22637-22647. [PMID: 31141339 PMCID: PMC6602408 DOI: 10.1021/acsami.9b04344] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
We studied the chemical-physical nature of interactions involved in the formation of adducts of two-dimensional black phosphorus (2D BP) with organoboron derivatives of a conjugated fluorescent molecule (pyrene). Time-resolved fluorescence spectroscopy showed a stabilization effect of 2D BP on all derivatives, in particular for the adducts endowed with the boronic functionalities. Also, a stronger modulation of the fluorescence decay with oxygen was registered for one of the adducts compared to the corresponding organoboron derivative alone. Nuclear magnetic resonance experiments in suspension and density functional theory simulations confirmed that only noncovalent interactions were involved in the formation of the adducts. The energetic gain in their formation arises from the interaction of P atoms with both C atoms of the pyrene core and the B atom of the boronic functionalities, with a stronger contribution from the ester with respect to the acid one. The interaction results in the lowering of the band gap of 2D BP by around 0.10 eV. Furthermore, we demonstrated through Raman spectroscopy an increased stability toward oxidation in air of 2D BP in the adducts in the solid state (more than 6 months). The modification of the electronic structure at the interface between 2D BP and a conjugated organic molecule through noncovalent stabilizing interactions mediated by the B atom is particularly appealing in view of creating heterojunctions for optoelectronic, photonic, and chemical sensing applications.
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Affiliation(s)
- Margherita Bolognesi
- Istituto
per lo Studio dei Materiali Nanostrutturati (ISMN)—Consiglio
Nazionale delle Ricerche (CNR), Via P. Gobetti 101, 40129 Bologna, Italy
| | - Salvatore Moschetto
- Istituto
per lo Studio dei Materiali Nanostrutturati (ISMN)—Consiglio
Nazionale delle Ricerche (CNR), Via P. Gobetti 101, 40129 Bologna, Italy
| | - Mariachiara Trapani
- Istituto
per lo Studio dei Materiali Nanostrutturati (ISMN)—Consiglio
Nazionale delle Ricerche (CNR), c/o Dipartimento di Scienze Chimiche,
Biologiche, Farmaceutiche e Ambientali, University of Messina, V.le F. Stagno d’Alcontres
31, 98166 Messina, Italy
| | - Federico Prescimone
- Istituto
per lo Studio dei Materiali Nanostrutturati (ISMN)—Consiglio
Nazionale delle Ricerche (CNR), Via P. Gobetti 101, 40129 Bologna, Italy
| | - Claudia Ferroni
- Istituto
per la Sintesi Organica e la Fotoreattività (ISOF)—Consiglio
Nazionale delle Ricerche (CNR), Via P. Gobetti 101, 40129 Bologna, Italy
| | - Gabriele Manca
- Istituto
di Chimica dei Composti Organometallici (ICCOM)—Consiglio Nazionale
delle Ricerche (CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Florence, Italy
| | - Andrea Ienco
- Istituto
di Chimica dei Composti Organometallici (ICCOM)—Consiglio Nazionale
delle Ricerche (CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Florence, Italy
| | - Silvia Borsacchi
- Istituto
di Chimica dei Composti Organometallici (ICCOM)—Consiglio Nazionale
delle Ricerche (CNR), via G. Moruzzi 1, 56124 Pisa, Italy
| | - Maria Caporali
- Istituto
di Chimica dei Composti Organometallici (ICCOM)—Consiglio Nazionale
delle Ricerche (CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Florence, Italy
| | - Michele Muccini
- Istituto
per lo Studio dei Materiali Nanostrutturati (ISMN)—Consiglio
Nazionale delle Ricerche (CNR), Via P. Gobetti 101, 40129 Bologna, Italy
| | - Maurizio Peruzzini
- Istituto
di Chimica dei Composti Organometallici (ICCOM)—Consiglio Nazionale
delle Ricerche (CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Florence, Italy
| | - Manuel Serrano-Ruiz
- Istituto
di Chimica dei Composti Organometallici (ICCOM)—Consiglio Nazionale
delle Ricerche (CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Florence, Italy
| | - Lucia Calucci
- Istituto
di Chimica dei Composti Organometallici (ICCOM)—Consiglio Nazionale
delle Ricerche (CNR), via G. Moruzzi 1, 56124 Pisa, Italy
| | - Maria Angela Castriciano
- Istituto
per lo Studio dei Materiali Nanostrutturati (ISMN)—Consiglio
Nazionale delle Ricerche (CNR), c/o Dipartimento di Scienze Chimiche,
Biologiche, Farmaceutiche e Ambientali, University of Messina, V.le F. Stagno d’Alcontres
31, 98166 Messina, Italy
- E-mail: (M.A.C.)
| | - Stefano Toffanin
- Istituto
per lo Studio dei Materiali Nanostrutturati (ISMN)—Consiglio
Nazionale delle Ricerche (CNR), Via P. Gobetti 101, 40129 Bologna, Italy
- E-mail: (S.T.)
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13
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Abstract
In designing drug delivery systems with improved release properties and bioavailability, the dynamic features of the active pharmaceutical ingredient can be crucial for the final product properties. In this work, we aimed at obtaining the first characterization of the molecular dynamic properties of one of the most common nonsteroidal anti-inflammatory drug, ibuprofen, intercalated in hydrotalcite, an interesting inorganic carrier. By exploiting a variety of solid state NMR techniques, including 1H and 13C MAS spectra and T1 relaxation measurements, performed at variable temperature and carrying out a synergic analysis of all results, it has been possible to ascertain that the mobility of ibuprofen within the carrier is remarkably increased. In particular, strong indications have been obtained that ibuprofen molecules, in addition to internal interconformational dynamics, experience an overall molecular motion. Also considering that ibuprofen is "anchored" to the charged surface of the hydrotalcite layers through its carboxylate moiety, such motion could be a wobbling-in-a-cone. Activation energies and correlation times of all the motions of intercalated ibuprofen have been determined.
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Affiliation(s)
- Elisa Carignani
- Dipartimento di Chimica e Chimica Industriale , Università di Pisa , via G. Moruzzi 13 , 56124 Pisa , Italy.,Istituto di Chimica dei Composti Organo Metallici - CNR , via G. Moruzzi 1 , 56124 Pisa , Italy
| | - Silvia Borsacchi
- Istituto di Chimica dei Composti Organo Metallici - CNR , via G. Moruzzi 1 , 56124 Pisa , Italy
| | - Paolo Blasi
- Scuola di Scienze del Farmaco e dei Prodotti della Salute , Università di Camerino , via Gentile III da Varano , 62032 Camerino , Italy
| | - Aurélie Schoubben
- Dipartimento di Scienze Farmaceutiche , Università di Perugia , via del Liceo 1 , 06123 Perugia , Italy
| | - Marco Geppi
- Dipartimento di Chimica e Chimica Industriale , Università di Pisa , via G. Moruzzi 13 , 56124 Pisa , Italy.,Istituto di Chimica dei Composti Organo Metallici - CNR , via G. Moruzzi 1 , 56124 Pisa , Italy
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14
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Borsacchi S, Sudhakaran UP, Calucci L, Martini F, Carignani E, Messori M, Geppi M. Rubber-Filler Interactions in Polyisoprene Filled with In Situ Generated Silica: A Solid State NMR Study. Polymers (Basel) 2018; 10:E822. [PMID: 30960747 PMCID: PMC6403753 DOI: 10.3390/polym10080822] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2018] [Revised: 07/21/2018] [Accepted: 07/23/2018] [Indexed: 02/07/2023] Open
Abstract
In this paper we used high- and low-resolution solid state Nuclear Magnetic Resonance (NMR) techniques to investigate a series of polyisoprene samples filled with silica generated in situ from tetraethoxysilane by sol-gel process. In particular, ¹H spin-lattice and spin-spin relaxation times allowed us to get insights into the dynamic properties of both the polymer bulk and the bound rubber, and to obtain a comparative estimate of the amount of bound rubber in samples prepared with different compositions and sol-gel reaction times. In all samples, three fractions with different mobility could be distinguished by ¹H T₂ and ascribed to loosely bound rubber, polymer bulk, and free chain ends. The amount of bound rubber was found to be dependent on sample preparation, and it resulted maximum in the sample showing the best dispersion of silica domains in the rubber matrix. The interpretation of the loosely bound rubber in terms of "glassy" behaviour was discussed, also on the basis of ¹H T₁ and T1ρ data.
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Affiliation(s)
- Silvia Borsacchi
- Italian National Council for Research-Institute for the Chemistry of OrganoMetallic Compounds, CNR-ICCOM, via G. Moruzzi 1, 56124 Pisa, Italy.
| | | | - Lucia Calucci
- Italian National Council for Research-Institute for the Chemistry of OrganoMetallic Compounds, CNR-ICCOM, via G. Moruzzi 1, 56124 Pisa, Italy.
| | - Francesca Martini
- Department of Chemistry and Industrial Chemistry, University of Pisa, via G. Moruzzi 13, 56124 Pisa, Italy.
| | - Elisa Carignani
- Department of Chemistry and Industrial Chemistry, University of Pisa, via G. Moruzzi 13, 56124 Pisa, Italy.
| | - Massimo Messori
- Department of Engineering "Enzo Ferrari", University of Modena and Reggio Emilia, via P. Vivarelli 10/1, 41125 Modena, Italy.
| | - Marco Geppi
- Department of Chemistry and Industrial Chemistry, University of Pisa, via G. Moruzzi 13, 56124 Pisa, Italy.
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15
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Passaglia E, Cicogna F, Costantino F, Coiai S, Legnaioli S, Lorenzetti G, Borsacchi S, Geppi M, Telesio F, Heun S, Ienco A, Serrano-Ruiz M, Peruzzini M. Polymer-Based Black Phosphorus (bP) Hybrid Materials by in Situ Radical Polymerization: An Effective Tool To Exfoliate bP and Stabilize bP Nanoflakes. Chem Mater 2018; 30:2036-2048. [PMID: 29887671 PMCID: PMC5989699 DOI: 10.1021/acs.chemmater.7b05298] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Revised: 02/28/2018] [Indexed: 05/12/2023]
Abstract
Black phosphorus (bP) has been recently investigated for next generation nanoelectronic multifunctional devices. However, the intrinsic instability of exfoliated bP (the bP nanoflakes) toward both moisture and air has so far overshadowed its practical implementation. In order to contribute to fill this gap, we report here the preparation of new hybrid polymer-based materials where bP nanoflakes (bPn) exhibit a significantly improved stability. The new materials have been prepared by different synthetic paths including: (i) the mixing of conventionally liquid-phase exfoliated bP (in dimethyl sulfoxide, DMSO) with poly(methyl methacrylate) (PMMA) solution; (ii) the direct exfoliation of bP in a polymeric solution; (iii) the in situ radical polymerization after exfoliating bP in the liquid monomer (methyl methacrylate, MMA). This last methodology concerns the preparation of stable suspensions of bPn-MMA by sonication-assisted liquid-phase exfoliation (LPE) of bP in the presence of MMA followed by radical polymerization. The hybrids characteristics have been compared in order to evaluate the bP dispersion and the effectiveness of the bPn interfacial interactions with polymer chains aimed at their long-term environmental stabilization. The passivation of the bPn is particularly effective when the hybrid material is prepared by in situ polymerization. By using this synthetic methodology, the nanoflakes, even if with a gradient of dispersion (size of aggregates), preserve their chemical structure from oxidation (as proved by both Raman and 31P-solid state NMR studies) and are particularly stable to air and UV light exposure. The feasibility of this approach, capable of efficiently exfoliating bP while protecting the bPn, has been then verified by using different vinyl monomers (styrene and N-vinylpyrrolidone), thus obtaining hybrids where the nanoflakes are embedded in polymer matrices with a variety of intriguing thermal, mechanical, and solubility characteristics.
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Affiliation(s)
- Elisa Passaglia
- Istituto
di Chimica dei Composti Organometallici (CNR-ICCOM), SS Pisa, Via Moruzzi 1, 56124 Pisa, Italy
| | - Francesca Cicogna
- Istituto
di Chimica dei Composti Organometallici (CNR-ICCOM), SS Pisa, Via Moruzzi 1, 56124 Pisa, Italy
| | - Federica Costantino
- Istituto
di Chimica dei Composti Organometallici (CNR-ICCOM), SS Pisa, Via Moruzzi 1, 56124 Pisa, Italy
| | - Serena Coiai
- Istituto
di Chimica dei Composti Organometallici (CNR-ICCOM), SS Pisa, Via Moruzzi 1, 56124 Pisa, Italy
| | - Stefano Legnaioli
- Istituto
di Chimica dei Composti Organometallici (CNR-ICCOM), SS Pisa, Via Moruzzi 1, 56124 Pisa, Italy
| | - Giulia Lorenzetti
- Istituto
di Chimica dei Composti Organometallici (CNR-ICCOM), SS Pisa, Via Moruzzi 1, 56124 Pisa, Italy
| | - Silvia Borsacchi
- Istituto
di Chimica dei Composti Organometallici (CNR-ICCOM), SS Pisa, Via Moruzzi 1, 56124 Pisa, Italy
| | - Marco Geppi
- Istituto
di Chimica dei Composti Organometallici (CNR-ICCOM), SS Pisa, Via Moruzzi 1, 56124 Pisa, Italy
- Dipartimento
di Chimica e Chimica Industriale (DCCI), Via Moruzzi 13, 56121 Pisa, Italy
| | - Francesca Telesio
- NEST,
Istituto Nanoscienze-CNR and Scuola Normale Superiore, Piazza San Silvestro 12, 56127 Pisa, Italy
| | - Stefan Heun
- NEST,
Istituto Nanoscienze-CNR and Scuola Normale Superiore, Piazza San Silvestro 12, 56127 Pisa, Italy
| | - Andrea Ienco
- Istituto
di Chimica dei Composti Organometallici (CNR-ICCOM), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy
| | - Manuel Serrano-Ruiz
- Istituto
di Chimica dei Composti Organometallici (CNR-ICCOM), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy
| | - Maurizio Peruzzini
- Istituto
di Chimica dei Composti Organometallici (CNR-ICCOM), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy
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16
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Borsacchi S, Geppi M, Macchi S, Ninham BW, Fratini E, Ambrosi M, Baglioni P, Lo Nostro P. Phase transitions in hydrophobe/phospholipid mixtures: hints at connections between pheromones and anaesthetic activity. Phys Chem Chem Phys 2018; 18:15375-83. [PMID: 27210443 DOI: 10.1039/c6cp00659k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The phase behavior of a mixture of a typical insect pheromone (olean) and a phospholipid (DOPC)/water dispersion is extensively explored through SAXS, NMR and DSC experiments. The results mimic those obtained with anaesthetics in phospholipid/water systems. They also mimic the behavior and microstructure of ternary mixtures of a membrane mimetic, bilayer-forming double chained surfactants, oils and water. Taken together with recent models for conduction of the nervous impulse, all hint at lipid involvement and the underlying unity in mechanisms of pheromone, anaesthetic and hydrophobic drugs, where a local phase change in the lipid membrane architecture may be at least partly involved in the transmission of the signal.
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Affiliation(s)
- Silvia Borsacchi
- Istituto di Chimica dei Composti OrganoMetallici (ICCOM) del CNR, 56124 Pisa, Italy
| | - Marco Geppi
- Department of Chemistry and Industrial Chemistry, University of Pisa, 56124 Pisa, Italy
| | - Sara Macchi
- Department of Chemistry and Industrial Chemistry, University of Pisa, 56124 Pisa, Italy
| | - Barry W Ninham
- Department of Chemistry & CSGI, University of Florence, 50019 Sesto Fiorentino (Firenze), Italy. and Department of Applied Mathematics, Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT 0200, Australia
| | - Emiliano Fratini
- Department of Chemistry & CSGI, University of Florence, 50019 Sesto Fiorentino (Firenze), Italy.
| | - Moira Ambrosi
- Department of Chemistry & CSGI, University of Florence, 50019 Sesto Fiorentino (Firenze), Italy.
| | - Piero Baglioni
- Department of Chemistry & CSGI, University of Florence, 50019 Sesto Fiorentino (Firenze), Italy. and Enzo Ferroni Foundation, 50019 Sesto Fiorentino (Firenze), Italy
| | - Pierandrea Lo Nostro
- Department of Chemistry & CSGI, University of Florence, 50019 Sesto Fiorentino (Firenze), Italy. and Enzo Ferroni Foundation, 50019 Sesto Fiorentino (Firenze), Italy
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17
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Civita P, Scopelliti C, Menicagli M, Lessi F, Millanta F, Borsacchi S, Freer G, Pistello M, Mazzanti C, Poli A. Molecular and Immunohistochemical Analyses Identify the Presence of Mouse Mammary Tumour Virus-Like Sequences in Feline Mammary Carcinomas. J Comp Pathol 2018. [DOI: 10.1016/j.jcpa.2017.10.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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18
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Tedesco AD, Ambrosi E, Borsacchi S, Benedetti A. Functionalization of Mesoporous Silica Nanoparticles with Organosilanes: Experimental Evidence of the Interaction Between Organic Groups and Silica Surface. CURR ORG CHEM 2017. [DOI: 10.2174/1385272821666161230120108] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Anna Del Tedesco
- Department of Molecular Sciences and Nanosystems and Centro di Microscopia Elettronica “Giovanni Stevanato”, Universita Ca' Foscari Venezia, via Torino 155/b, 30170 Venezia-Mestre, Italy
| | - Emmanuele Ambrosi
- Department of Molecular Sciences and Nanosystems and Centro di Microscopia Elettronica “Giovanni Stevanato”, Universita Ca' Foscari Venezia, via Torino 155/b, 30170 Venezia-Mestre, Italy
| | - Silvia Borsacchi
- Istituto di Chimica dei Composti Organometallici (ICCOM) del Consiglio Nazionale delle Ricerche, Area della Ricerca di Pisa-S. Cataldo, via G. Moruzzi 1, 56124 Pisa, Italy
| | - Alvise Benedetti
- Department of Molecular Sciences and Nanosystems and Centro di Microscopia Elettronica “Giovanni Stevanato”, Universita Ca' Foscari Venezia, via Torino 155/b, 30170 Venezia-Mestre, Italy
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19
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Barsi D, Borsacchi S, Calucci L, Tarantino A, Pinzino C, Bertoldo M. Tuning the functionalization degree of amylose and amylopectin with photochromic spiropyran by CuAAc reaction. POLYMER 2017. [DOI: 10.1016/j.polymer.2017.05.046] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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20
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Sottile M, Tomei G, Borsacchi S, Martini F, Geppi M, Ruggeri G, Pucci A. Epoxy resin doped with Coumarin 6: Example of accessible luminescent collectors. Eur Polym J 2017. [DOI: 10.1016/j.eurpolymj.2017.02.003] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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21
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Tonelli M, Martini F, Calucci L, Fratini E, Geppi M, Ridi F, Borsacchi S, Baglioni P. Structural characterization of magnesium silicate hydrate: towards the design of eco-sustainable cements. Dalton Trans 2016; 45:3294-304. [PMID: 26781557 DOI: 10.1039/c5dt03545g] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Magnesium-based cement is one of the most interesting eco-sustainable alternatives to standard cementitious binders. The reasons for the interest towards this material are twofold: (i) its production process, using magnesium silicates, brine or seawater, dramatically reduces CO2 emissions with respect to Portland cement production, and (ii) it is very well suited to applications in radioactive waste encapsulation. In spite of its potential, assessment of the structural properties of its binder phase (magnesium silicate hydrate or M-S-H) is far from complete, especially because of its amorphous character. In this work, a comprehensive structural characterization of M-S-H was obtained using a multi-technique approach, including a detailed solid-state NMR investigation and, in particular, for the first time, quantitative (29)Si solid-state NMR data. M-S-H was prepared through room-temperature hydration of highly reactive MgO and silica fume and was monitored for 28 days. The results clearly evidenced the presence in M-S-H of "chrysotile-like" and "talc-like" sub-nanometric domains, which are approximately in a 1 : 1 molar ratio after long-time hydration. Both these kinds of domains have a high degree of condensation, corresponding to the presence of a small amount of silanols in the tetrahedral sheets. The decisive improvement obtained in the knowledge of M-S-H structure paves the way for tailoring the macroscopic properties of eco-sustainable cements by means of a bottom-up approach.
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Affiliation(s)
- M Tonelli
- Department of Chemistry "Ugo Schiff" & CSGI, University of Florence, Sesto Fiorentino 50019, Florence, Italy.
| | - F Martini
- Istituto di Chimica dei Composti OrganoMetallici, Consiglio Nazionale delle Ricerche - CNR U.O.S. di Pisa, Pisa 56124, Italy.
| | - L Calucci
- Istituto di Chimica dei Composti OrganoMetallici, Consiglio Nazionale delle Ricerche - CNR U.O.S. di Pisa, Pisa 56124, Italy.
| | - E Fratini
- Department of Chemistry "Ugo Schiff" & CSGI, University of Florence, Sesto Fiorentino 50019, Florence, Italy.
| | - M Geppi
- Department of Chemistry and Industrial Chemistry, University of Pisa, Pisa 56124, Italy
| | - F Ridi
- Department of Chemistry "Ugo Schiff" & CSGI, University of Florence, Sesto Fiorentino 50019, Florence, Italy.
| | - S Borsacchi
- Istituto di Chimica dei Composti OrganoMetallici, Consiglio Nazionale delle Ricerche - CNR U.O.S. di Pisa, Pisa 56124, Italy.
| | - P Baglioni
- Department of Chemistry "Ugo Schiff" & CSGI, University of Florence, Sesto Fiorentino 50019, Florence, Italy.
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22
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Malba C, Sudhakaran UP, Borsacchi S, Geppi M, Enrichi F, Natile MM, Armelao L, Finotto T, Marin R, Riello P, Benedetti A. Structural and photophysical properties of rare-earth complexes encapsulated into surface modified mesoporous silica nanoparticles. Dalton Trans 2015; 43:16183-96. [PMID: 24874265 DOI: 10.1039/c4dt00760c] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The encapsulation of [Eu(dbm)3phen] into functionalized mesoporous silica nanoparticles (MSN) has been carried out to study the effect of chemical environments on the photoluminescence properties of the rare-earth complex. Surface functionalization was achieved by the reaction of the silanol groups on the surface of mesoporous silica with different organosilylating agents such as (3-aminopropyl)-triethoxysilane (APTES), (3-mercaptopropyl)-trimethoxysilane (MPTMS), and ethoxytrimethylsilane (ETMS). A change in the luminescence properties of the Eu(dbm)3phen complex has been observed on its encapsulation into surface modified mesoporous silica nanoparticles. The modification of photophysical properties is attributed to the interaction of Eu(dbm)3phen with the different chemical environments in the functionalized mesoporous silica nanoparticles (MSN). The luminescence properties of the rare-earth complex in surface-modified MSN increase in the order MSN < MSN-ETMS < MSN-MPTMS < MSN-APTES. The Eu(dbm)3phen complex encapsulated in the functionalized mesoporous silica nanoparticles shows an enhanced luminescence and an increased lifetime compared to the pure rare-earth complex in the solid state and that in unmodified MSN. This implies that some interactions of the lanthanide complexes take place during their incorporation process into the organically modified mesoporous silica nanoparticles. The organically modified mesoporous silica nanoparticles were characterized by Fourier transform infrared spectroscopy (FTIR) and N2 adsorption desorption measurements. The luminescence properties of the encapsulated Eu(dbm)3phen were studied in detail. Moreover, the effect of functionalized MSNs on the structural behaviour of the Eu(dbm)3phen was investigated by solid state nuclear magnetic resonance (SSNMR) techniques using an analogous diamagnetic model complex, Y(dbm)3phen, encapsulated into functionalized MSNs. These studies indicate that the encapsulated rare-earth complex shows some interactions with the functional groups anchored on the surface of MSNs.
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Affiliation(s)
- Chandrashekhar Malba
- Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca' Foscari Venezia, INSTN and Centro di Microscopia Elettronica "Giovanni Stevanato", via Torino 155/b, 30170 Venezia-Mestre, Italy.
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23
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Carlotti M, Gullo G, Battisti A, Martini F, Borsacchi S, Geppi M, Ruggeri G, Pucci A. Thermochromic polyethylene films doped with perylene chromophores: experimental evidence and methods for characterization of their phase behaviour. Polym Chem 2015. [DOI: 10.1039/c5py00486a] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
LLDPE films doped with aggregachromic PE-Pery fluorophores were proposed as a thermochromic system in the 30–70 °C regime.
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Affiliation(s)
- Marco Carlotti
- Stratingh Institute for Chemistry and Zernike Institute for Advanced Materials
- University of Groningen
- 9747 AG Groningen
- The Netherlands
| | - Giuseppa Gullo
- Dipartimento di Chimica e Chimica Industriale
- Università di Pisa
- 56124 Pisa
- Italy
| | - Antonella Battisti
- Istituto di Biofisica – CNR and NEST – Scuola Normale Superiore
- Pisa
- Italy
| | - Francesca Martini
- Istituto di Chimica dei Composti Organometallici del CNR
- 56124 Pisa
- Italy
- INSTM
- Unità di Ricerca di Pisa
| | - Silvia Borsacchi
- Istituto di Chimica dei Composti Organometallici del CNR
- 56124 Pisa
- Italy
- INSTM
- Unità di Ricerca di Pisa
| | - Marco Geppi
- Dipartimento di Chimica e Chimica Industriale
- Università di Pisa
- 56124 Pisa
- Italy
- Istituto di Chimica dei Composti Organometallici del CNR
| | - Giacomo Ruggeri
- Dipartimento di Chimica e Chimica Industriale
- Università di Pisa
- 56124 Pisa
- Italy
- INSTM
| | - Andrea Pucci
- Dipartimento di Chimica e Chimica Industriale
- Università di Pisa
- 56124 Pisa
- Italy
- INSTM
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24
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Borsacchi S, Calucci L, Geppi M, La Terra F, Pinzino C, Bertoldo M. Characterization of an amylose-graft-poly(n-butyl methacrylate) copolymer obtained by click chemistry by EPR and SS-NMR spectroscopies. Carbohydr Polym 2014; 112:245-54. [DOI: 10.1016/j.carbpol.2014.05.086] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2014] [Revised: 04/28/2014] [Accepted: 05/19/2014] [Indexed: 11/28/2022]
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25
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Borsacchi S, Paderni K, Messori M, Toselli M, Pilati F, Geppi M. Insights into Shape-Memory Poly(ε-caprolactone) Materials by Solid-State NMR. Macromolecules 2014. [DOI: 10.1021/ma5005716] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Silvia Borsacchi
- Dipartimento
di Chimica e Chimica Industriale, Università di Pisa, via Risorgimento
35, 56126 Pisa, Italy
- INSTM, via G. Giusti
9, 50121 Firenze, Italy
| | - Katia Paderni
- Dipartimento
di Ingegneria “Enzo Ferrari”, Università di Modena e Reggio Emilia, via Vignolese 905/A, 41125 Modena, Italy
- INSTM, via G. Giusti
9, 50121 Firenze, Italy
| | - Massimo Messori
- Dipartimento
di Ingegneria “Enzo Ferrari”, Università di Modena e Reggio Emilia, via Vignolese 905/A, 41125 Modena, Italy
- INSTM, via G. Giusti
9, 50121 Firenze, Italy
| | - Maurizio Toselli
- Dipartimento
di Chimica Industriale “Toso Montanari”, Università di Bologna, viale Risorgimento 4, 40136 Bologna, Italy
- INSTM, via G. Giusti
9, 50121 Firenze, Italy
| | - Francesco Pilati
- Dipartimento
di Ingegneria “Enzo Ferrari”, Università di Modena e Reggio Emilia, via Vignolese 905/A, 41125 Modena, Italy
- INSTM, via G. Giusti
9, 50121 Firenze, Italy
| | - Marco Geppi
- Dipartimento
di Chimica e Chimica Industriale, Università di Pisa, via Risorgimento
35, 56126 Pisa, Italy
- INSTM, via G. Giusti
9, 50121 Firenze, Italy
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26
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Concistrè M, Carignani E, Borsacchi S, Johannessen OG, Mennucci B, Yang Y, Geppi M, Levitt MH. Freezing of Molecular Motions Probed by Cryogenic Magic Angle Spinning NMR. J Phys Chem Lett 2014; 5:512-516. [PMID: 26276602 DOI: 10.1021/jz4026276] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Cryogenic magic angle spinning makes it possible to obtain the NMR spectra of solids at temperatures low enough to freeze out most molecular motions. We have applied cryogenic magic angle spinning NMR to a crystalline small-molecule solid (ibuprofen sodium salt), which displays a variety of molecular dynamics. Magic angle (13)C NMR spectra are shown for a wide range of temperatures, including in the cryogenic regime down to 20 K. The hydrophobic and hydrophilic regions of the molecular structure display different behavior in the cryogenic regime, with the hydrophilic region remaining well-structured, while the hydrophobic region exhibits a broad frozen conformational distribution.
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Affiliation(s)
- Maria Concistrè
- †School of Chemistry, University of Southampton, SO17 1BJ Southampton, United Kingdom
| | - Elisa Carignani
- ‡Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, 56126 Pisa, Italy
| | - Silvia Borsacchi
- ‡Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, 56126 Pisa, Italy
| | - Ole G Johannessen
- †School of Chemistry, University of Southampton, SO17 1BJ Southampton, United Kingdom
| | - Benedetta Mennucci
- ‡Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, 56126 Pisa, Italy
| | - Yifeng Yang
- §School of Engineering Science, University of Southampton, Southampton, United Kingdom
| | - Marco Geppi
- ‡Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, 56126 Pisa, Italy
| | - Malcolm H Levitt
- †School of Chemistry, University of Southampton, SO17 1BJ Southampton, United Kingdom
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Martini F, Borsacchi S, Geppi M, Ruggeri G, Pucci A. Understanding the aggregation of bis(benzoxazolyl)stilbene in PLA/PBS blends: a combined spectrofluorimetric, calorimetric and solid state NMR approach. Polym Chem 2014. [DOI: 10.1039/c3py01039b] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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28
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Fabbri P, Mohammad Poor S, Ferrari L, Rovati L, Borsacchi S, Geppi M, Lima P, Carlos L. Highly stable plastic optical fibre amplifiers containing [Eu(btfa)3(MeOH)(bpeta)]: A luminophore able to drive the synthesis of polyisocyanates. POLYMER 2014. [DOI: 10.1016/j.polymer.2013.12.043] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Borsacchi S, Sudhakaran U, Geppi M, Ricci L, Liuzzo V, Ruggeri G. Synthesis, characterization, and solid-state NMR investigation of organically modified bentonites and their composites with LDPE. Langmuir 2013; 29:9164-9172. [PMID: 23786424 DOI: 10.1021/la401686p] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Polymer/clay nanocomposites show remarkably improved properties (mechanical properties, as well as decreased gas permeability and flammability, etc.) with respect to their microscale counterparts and pristine polymers. Due to the substantially apolar character of most of the organic polymers, natural occurring hydrophilic clays are modified into organophilic clays with consequent increase of the polymer/clay compatibility. Different strategies have been developed for the preparation of nanocomposites with improved properties, especially aimed at achieving the best dispersion of clay platelets in the polymer matrix. In this paper we present the preparation and characterization of polymer/clay nanocomposites composed of low-density polyethylene (LDPE) and natural clay, montmorillonite-containing bentonite. Two different forms of the clay have been considered: the first, a commercial organophilic bentonite (Nanofil 15), obtained by exchanging the natural cations with dimethyldioctadecylammonium (2C18) cations, and the second, obtained by performing a grafting reaction of an alkoxysilane containing a polymerizable group, 3-(trimethoxysilyl)propyl methacrylate (TSPM), onto Nanofil 15. Both the clays and LDPE/clay nanocomposites were characterized by thermal, FT-IR, and X-ray diffraction techniques. The samples were also investigated by means of (29)Si, (13)C, and (1)H solid-state NMR, obtaining information on the structural properties of the modified clays. Moreover, by exploiting the effect of bentonite paramagnetic (Fe(3+)) ions on proton spin-lattice relaxation times (T1's), useful information about the extent of the polymer-clay dispersion and their interfacial interactions could be obtained.
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Affiliation(s)
- Silvia Borsacchi
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, 56126 Pisa, Italy.
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Bignotti F, Borsacchi S, de Santis R, Geppi M, Messori M, Sudhakaran UP. Interrelation between preparation conditions, structure, and mechanical reinforcement in isoprene rubber filled with
in situ
generated silica. J Appl Polym Sci 2012. [DOI: 10.1002/app.36337] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- F. Bignotti
- Dipartimento di Ingegneria Meccanica e Industriale, Università degli Studi di Brescia, Via Branze 38, 25123 Brescia, Italy
| | - S. Borsacchi
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, 56126 Pisa, Italy
| | - R. de Santis
- Dipartimento di Ingegneria Meccanica e Industriale, Università degli Studi di Brescia, Via Branze 38, 25123 Brescia, Italy
| | - M. Geppi
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, 56126 Pisa, Italy
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali, INSTM, Via G. Giusti 9, 50121 Firenze, Italy
| | - M. Messori
- Dipartimento di Ingegneria dei Materiali e dell'Ambiente, Università degli Studi di Modena e Reggio Emilia, Via Vignolese 905/A, 41125 Modena, Italy
| | - U. P. Sudhakaran
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, 56126 Pisa, Italy
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Borsacchi S, Martini F, Geppi M, Pilati F, Toselli M. Structure, dynamics and interactions of complex sol–gel hybrid materials through SSNMR and DSC: Part II, ternary systems based on PE–PEG block copolymer, PHS and silica. POLYMER 2011. [DOI: 10.1016/j.polymer.2011.07.055] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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32
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Cardelli A, Ricci L, Ruggeri G, Borsacchi S, Geppi M. Optical properties of a polyethylene dispersion with a luminescent silica prepared by surface grafting of a perylene derivative. Eur Polym J 2011. [DOI: 10.1016/j.eurpolymj.2011.05.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Carignani E, Borsacchi S, Geppi M. Dynamics by solid-state NMR: detailed study of ibuprofen Na salt and comparison with ibuprofen. J Phys Chem A 2011; 115:8783-90. [PMID: 21744822 DOI: 10.1021/jp202650n] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The various internal rotations and interconformational jumps of the Na-salt form of ibuprofen in the solid state were characterized in detail by means of the simultaneous analysis of a variety of low- and high-resolution NMR experiments aimed at measuring several (13)C and (1)H spectral and relaxation properties at different temperatures and frequencies. The results were first qualitatively analyzed to identify the motions of the different molecular fragments and to assign them to specific frequency regimes (slow, <10(3) Hz; intermediate, 10(3)-10(6) Hz; and fast, >10(6) Hz). Subsequently, a simultaneous fit of the experimental data sets most sensitive to each frequency range was performed by using suitable motional models, thus obtaining, for each motion, correlation times and activation energies. The motions so characterized were: the rotations of the three methyl groups and of the isobutyl group, occurring in the fast regime, and the π-flip of the phenyl ring, belonging to the intermediate motional regime. The results obtained for the Na-salt form were compared with those of the acidic form of ibuprofen, previously obtained from a similar solid-state NMR approach: despite the very similar chemical structure of the two compounds, their dynamic properties in the solid state are noticeably different.
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Affiliation(s)
- Elisa Carignani
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, v. Risorgimento 35, 56126 Pisa, Italy
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Carignani E, Borsacchi S, Geppi M. Detailed characterization of the dynamics of ibuprofen in the solid state by a multi-technique NMR approach. Chemphyschem 2011; 12:974-81. [PMID: 21381176 DOI: 10.1002/cphc.201000946] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2011] [Indexed: 02/05/2023]
Abstract
The internal rotations and interconformational jumps of ibuprofen in the solid state are fully characterized by the simultaneous analysis of a variety of low- and high-resolution NMR experiments for the measurement of several (13)C and (1)H spectral and relaxation properties, performed at different temperatures and, in some cases, frequencies. The results are first qualitatively analyzed to identify the motions of the different molecular fragments and to assign them to specific frequency ranges (slow, <10(3) Hz; intermediate, 10(3)-10(6) Hz; and fast, >10(6) Hz). In a second step, a simultaneous fit of the experimental data sets most sensitive to each frequency range is performed by means of suitable motional models to obtain, for each motion, values of correlation times and activation energies. The rotations of the three methyl groups around their ternary symmetry axes, which occur in the fast regime, are characterized by slightly different activation energies. Thanks to the simultaneous analysis of (1)H and (13)C data, the π-flip of the dimeric structure made by the acidic groups is also identified and seen to occur in the fast regime. On the contrary, the π-flip of the phenyl ring is found to occur in the slow motional regime, while the rotations of the isobutyl and propionic groups are frozen. The approach used appears to be of general applicability for studying the dynamics of small organic molecules.
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Affiliation(s)
- Elisa Carignani
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, 56126 Pisa, Italy
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35
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Borsacchi S, Ambrosi M, Nostro PL, Geppi M. Understanding the Properties of the Coagel and Gel Phases: A 2H and 13C NMR Study of Amphiphilic Ascorbic Acid Derivatives. J Phys Chem B 2010; 114:15872-8. [DOI: 10.1021/jp107324e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Silvia Borsacchi
- Department of Chemistry and Industrial Chemistry, University of Pisa, via Risorgimento 35, 56126 Pisa, Italy, and Department of Chemistry and CSGI, University of Florence, 50019 Sesto Fiorentino, Firenze, Italy
| | - Moira Ambrosi
- Department of Chemistry and Industrial Chemistry, University of Pisa, via Risorgimento 35, 56126 Pisa, Italy, and Department of Chemistry and CSGI, University of Florence, 50019 Sesto Fiorentino, Firenze, Italy
| | - Pierandrea Lo Nostro
- Department of Chemistry and Industrial Chemistry, University of Pisa, via Risorgimento 35, 56126 Pisa, Italy, and Department of Chemistry and CSGI, University of Florence, 50019 Sesto Fiorentino, Firenze, Italy
| | - Marco Geppi
- Department of Chemistry and Industrial Chemistry, University of Pisa, via Risorgimento 35, 56126 Pisa, Italy, and Department of Chemistry and CSGI, University of Florence, 50019 Sesto Fiorentino, Firenze, Italy
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36
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Sudhakaran U, Freris I, Geppi M, Borsacchi S, Cristofori D, Riello P, Benedetti A. A multinuclear solid-state magnetic resonance study on submicrometer-sized SiO2 particles encapsulated by a PMMA shell. Colloids Surf A Physicochem Eng Asp 2010. [DOI: 10.1016/j.colsurfa.2010.08.024] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Geppi M, Mollica G, Borsacchi S, Cappellozza S. Proton Spin−Lattice Relaxation in Silkworm Cocoons: Physisorbed Water and Serine Side-Chain Motions. J Phys Chem B 2010; 114:2586-92. [DOI: 10.1021/jp907843r] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Marco Geppi
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, via Risorgimento 35, 56126 Pisa, Italy, and CRA - Unità di Ricerca di Apicoltura e Bachicoltura di Bologna, sede di Padova, v. L. Eulero, 6a, 35143 Padova, Italy
| | - Giulia Mollica
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, via Risorgimento 35, 56126 Pisa, Italy, and CRA - Unità di Ricerca di Apicoltura e Bachicoltura di Bologna, sede di Padova, v. L. Eulero, 6a, 35143 Padova, Italy
| | - Silvia Borsacchi
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, via Risorgimento 35, 56126 Pisa, Italy, and CRA - Unità di Ricerca di Apicoltura e Bachicoltura di Bologna, sede di Padova, v. L. Eulero, 6a, 35143 Padova, Italy
| | - Silvia Cappellozza
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, via Risorgimento 35, 56126 Pisa, Italy, and CRA - Unità di Ricerca di Apicoltura e Bachicoltura di Bologna, sede di Padova, v. L. Eulero, 6a, 35143 Padova, Italy
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Borsacchi S, Calucci L, Czub J, Dabrowski R, Geppi M, Kuczyński W, Marini A, Mennucci B, Urban S. Orientational Order of Fluorinated Mesogens Containing the 1,3,2-Dioxaborinane Ring: A Multidisciplinary Approach. J Phys Chem B 2009; 113:15783-94. [DOI: 10.1021/jp908241n] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- S. Borsacchi
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, via Risorgimento 35, 56126 Pisa, Italy, Scuola Normale Superiore, Piazza dei Cavalieri 15, 56126 Pisa, Italy, Istituto per i Processi Chimico Fisici del CNR, via G. Moruzzi 1, 56124 Pisa, Italy, Institute of Physics, Jagellonian University, Reymonta 4, 30-059 Kraków, Poland, Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60179 Poznań, Poland, and Institute of Chemistry, Military University of Technology,
| | - L. Calucci
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, via Risorgimento 35, 56126 Pisa, Italy, Scuola Normale Superiore, Piazza dei Cavalieri 15, 56126 Pisa, Italy, Istituto per i Processi Chimico Fisici del CNR, via G. Moruzzi 1, 56124 Pisa, Italy, Institute of Physics, Jagellonian University, Reymonta 4, 30-059 Kraków, Poland, Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60179 Poznań, Poland, and Institute of Chemistry, Military University of Technology,
| | - J. Czub
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, via Risorgimento 35, 56126 Pisa, Italy, Scuola Normale Superiore, Piazza dei Cavalieri 15, 56126 Pisa, Italy, Istituto per i Processi Chimico Fisici del CNR, via G. Moruzzi 1, 56124 Pisa, Italy, Institute of Physics, Jagellonian University, Reymonta 4, 30-059 Kraków, Poland, Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60179 Poznań, Poland, and Institute of Chemistry, Military University of Technology,
| | - R. Dabrowski
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, via Risorgimento 35, 56126 Pisa, Italy, Scuola Normale Superiore, Piazza dei Cavalieri 15, 56126 Pisa, Italy, Istituto per i Processi Chimico Fisici del CNR, via G. Moruzzi 1, 56124 Pisa, Italy, Institute of Physics, Jagellonian University, Reymonta 4, 30-059 Kraków, Poland, Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60179 Poznań, Poland, and Institute of Chemistry, Military University of Technology,
| | - M. Geppi
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, via Risorgimento 35, 56126 Pisa, Italy, Scuola Normale Superiore, Piazza dei Cavalieri 15, 56126 Pisa, Italy, Istituto per i Processi Chimico Fisici del CNR, via G. Moruzzi 1, 56124 Pisa, Italy, Institute of Physics, Jagellonian University, Reymonta 4, 30-059 Kraków, Poland, Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60179 Poznań, Poland, and Institute of Chemistry, Military University of Technology,
| | - W. Kuczyński
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, via Risorgimento 35, 56126 Pisa, Italy, Scuola Normale Superiore, Piazza dei Cavalieri 15, 56126 Pisa, Italy, Istituto per i Processi Chimico Fisici del CNR, via G. Moruzzi 1, 56124 Pisa, Italy, Institute of Physics, Jagellonian University, Reymonta 4, 30-059 Kraków, Poland, Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60179 Poznań, Poland, and Institute of Chemistry, Military University of Technology,
| | - A. Marini
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, via Risorgimento 35, 56126 Pisa, Italy, Scuola Normale Superiore, Piazza dei Cavalieri 15, 56126 Pisa, Italy, Istituto per i Processi Chimico Fisici del CNR, via G. Moruzzi 1, 56124 Pisa, Italy, Institute of Physics, Jagellonian University, Reymonta 4, 30-059 Kraków, Poland, Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60179 Poznań, Poland, and Institute of Chemistry, Military University of Technology,
| | - B. Mennucci
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, via Risorgimento 35, 56126 Pisa, Italy, Scuola Normale Superiore, Piazza dei Cavalieri 15, 56126 Pisa, Italy, Istituto per i Processi Chimico Fisici del CNR, via G. Moruzzi 1, 56124 Pisa, Italy, Institute of Physics, Jagellonian University, Reymonta 4, 30-059 Kraków, Poland, Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60179 Poznań, Poland, and Institute of Chemistry, Military University of Technology,
| | - S. Urban
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, via Risorgimento 35, 56126 Pisa, Italy, Scuola Normale Superiore, Piazza dei Cavalieri 15, 56126 Pisa, Italy, Istituto per i Processi Chimico Fisici del CNR, via G. Moruzzi 1, 56124 Pisa, Italy, Institute of Physics, Jagellonian University, Reymonta 4, 30-059 Kraków, Poland, Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60179 Poznań, Poland, and Institute of Chemistry, Military University of Technology,
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Borsacchi S, Catalano D, Veracini CA. Structure and orientation of small molecules dissolved in the liquid crystalline phases of CsPFO/water system by multinuclear NMR. Phys Chem Chem Phys 2009; 11:3996-4006. [PMID: 19440629 DOI: 10.1039/b901895f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Pyridine, L-alanine and L-phenylalanine dissolved in the liquid crystalline phases of the lyotropic system CsPFO/water are studied by means of (2)H, (13)C and (1)H NMR. The orientational order parameters of the solutes are determined in a wide temperature range, together with some relevant geometrical parameters. In particular, a prevailing conformation for L-phenylalanine interacting with the micelle is suggested and, for all solutes, convincing representations of their specific interactions with the micelle surface are inferred. From (19)F and (13)C NMR spectra in the nematic phase, the orientational order parameters for the perfluorooctanoate chain inside the micelles are estimated.
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Affiliation(s)
- Silvia Borsacchi
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, via Risorgimento 35, 56126, Pisa, Italy
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Borsacchi S, Geppi M, Veracini CA, Lazzeri A, Di Cuia F, Geloni C. A multinuclear solid-state magnetic resonance study of the interactions between the inorganic and organic coatings of BaSO4 submicronic particles. Magn Reson Chem 2008; 46:52-57. [PMID: 18098232 DOI: 10.1002/mrc.2131] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Silica-coated BaSO4 submicronic particles, modified on the surface by treatment with stearic acid, have been characterized by means of 29Si, 13C, and 1H magic-angle-spinning (MAS) high-resolution techniques, and low-resolution 1H-FID analysis. Two types of adsorbed water were identified; adsorbed either inside or on the surface of BaSO4, most of the latter being removed by the silica coating. Evidences of silica-stearic acid interactions were found involving either carboxylic acid or carboxylate functional groups, and occurring by means of hydrogen and/or covalent bonds. Stearic acid was present as monolayer only, its chain being mostly rigid, even though a small fraction was subjected to fast inter-conformational motions.
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Affiliation(s)
- S Borsacchi
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, v. Risorgimento 35, 56126 Pisa Italy
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Marini M, Toselli M, Borsacchi S, Mollica G, Geppi M, Pilati F. Facile synthesis of core-shell organic–inorganic hybrid nanoparticles with amphiphilic polymer shell by one-step sol–gel reactions. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/pola.22511] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Borsacchi S, Geppi M, Ricci L, Ruggeri G, Veracini CA. Interactions at the surface of organophilic-modified laponites: a multinuclear solid-state NMR study. Langmuir 2007; 23:3953-60. [PMID: 17335254 DOI: 10.1021/la063040a] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Organically modified clays are largely employed in the preparation of nanostructured materials. The structural and dynamic characterization of the clay surface appears very important in the perspective of understanding the molecular mechanisms determining the improvement of the material properties. To this aim, in this work, a synthetic clay, Laponite, was studied in its untreated hydrophilic Na+-form, after ion exchange with alkylammonium cations and after subsequent grafting reaction with an alkoxysilane. These three samples were characterized by IR, SEM, TGA, and X-ray techniques and were deeply investigated by means of a wide combination of 29Si, 13C, and 1H high- and low-resolution solid-state NMR experiments. The grafting reaction with alkoxysilanes, occurring at the clay platelet edges, resulted in a reduction of the clay inter-platelet distances, and in an increased disorder in both the arrangement of the platelets and the conformational structure of the intercalated organic cation chains, probably due to the relative twisting of adjacent platelets.
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Affiliation(s)
- Silvia Borsacchi
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, v. Risorgimento 35, 56126 Pisa, Italy
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Borsacchi S, Cappellozza S, Catalano D, Geppi M, Ierardi V. Solid State NMR Investigation of the Molecular Dynamics of Cocoon Silks Produced by Different Bombyx mori (Lepidoptera) Strains. Biomacromolecules 2006; 7:1266-73. [PMID: 16602748 DOI: 10.1021/bm0510092] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Cocoons produced by different strains of Bombyx mori larvae were investigated by a combination of several high- and low-resolution 1H and 13C solid-state NMR techniques in order to characterize and compare their dynamic behavior at a molecular level. A detailed interpretation in terms of molecular motions in these very complex systems was possible thanks to the integrated analysis of different relaxation measurements and high-resolution selective experiments. Untreated cocoons of all strains were found to be mainly constituted by two different types of rigid domains and by a third one, more mobile, due to physisorbed water molecules. Dynamic processes in the MHz and kHz ranges were characterized by means of different 1H and 13C relaxation times. Cocoons arising from different strains exhibit a different content of physisorbed water and also slightly different dynamic behavior, especially in the MHz regime.
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Affiliation(s)
- Silvia Borsacchi
- Dipartimento di Chimica e Chimica Industriale, Università degli Studi di Pisa, v. Risorgimento 35, 56126 Pisa, Italy
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Borsacchi S, Geppi M, Veracini CA, Fallani F, Ricci L, Ruggeri G. Improving compatibility in LDPE–silica dispersions by photo-grafting reaction. Preparation and solid state NMR investigation. ACTA ACUST UNITED AC 2006. [DOI: 10.1039/b607354a] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Borsacchi S, Geppi M, Iuliano A, Veracini CA. Solid-state NMR characterization of diastereoisomeric chiral stationary phases and their soluble models. Solid State Nucl Magn Reson 2005; 28:193-203. [PMID: 16202569 DOI: 10.1016/j.ssnmr.2005.08.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2005] [Indexed: 05/04/2023]
Abstract
Two diastereoisomeric chiral stationary phases (CSPs), devised for enantioselective HPLC, showing unexplained differences in their chromatographic performances, have been characterized, together with their soluble models, by means of 13C-cross polarization/magic angle spinning (CP/MAS), 1H-MAS and 1H-free induction decay (FID) analysis. The NMR investigation of the soluble models has not highlighted significant structural/conformational differences between the two diastereoisomers, but has constituted a useful support for the analysis of the more complex NMR data of the CSPs. The organic chiral selectors of the stationary phases show a poor internal mobility and no conformational differences between the two diastereoisomers have been observed. On the contrary, interesting differences between the two CSPs have been found involving the silanols on the silica surface and the dynamics of the linking chains between the organic selectors and the silica surface itself. An explanation of the chromatographic behaviour has been proposed in terms of different proximity of the organic moieties with respect to the inorganic surface in the two CSPs.
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Affiliation(s)
- S Borsacchi
- Dipartimento di Chimica e Chimica Industriale, Università degli Studi di Pisa, v. Risorgimento 35, 56126 Pisa, Italy
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Bernazzani L, Borsacchi S, Catalano D, Gianni P, Mollica V, Vitelli M, Asaro F, Feruglio L. On the Interaction of Sodium Dodecyl Sulfate with Oligomers of Poly(Ethylene Glycol) in Aqueous Solution. J Phys Chem B 2004. [DOI: 10.1021/jp049673k] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Luca Bernazzani
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35 − I-56126 Pisa, Italy, and Dipartimento di Chimica, Università di Trieste, Via L. Giorgeri 1-I-34127 Trieste, Italy
| | - Silvia Borsacchi
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35 − I-56126 Pisa, Italy, and Dipartimento di Chimica, Università di Trieste, Via L. Giorgeri 1-I-34127 Trieste, Italy
| | - Donata Catalano
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35 − I-56126 Pisa, Italy, and Dipartimento di Chimica, Università di Trieste, Via L. Giorgeri 1-I-34127 Trieste, Italy
| | - Paolo Gianni
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35 − I-56126 Pisa, Italy, and Dipartimento di Chimica, Università di Trieste, Via L. Giorgeri 1-I-34127 Trieste, Italy
| | - Vincenzo Mollica
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35 − I-56126 Pisa, Italy, and Dipartimento di Chimica, Università di Trieste, Via L. Giorgeri 1-I-34127 Trieste, Italy
| | - Matteo Vitelli
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35 − I-56126 Pisa, Italy, and Dipartimento di Chimica, Università di Trieste, Via L. Giorgeri 1-I-34127 Trieste, Italy
| | - Fioretta Asaro
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35 − I-56126 Pisa, Italy, and Dipartimento di Chimica, Università di Trieste, Via L. Giorgeri 1-I-34127 Trieste, Italy
| | - Luigi Feruglio
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35 − I-56126 Pisa, Italy, and Dipartimento di Chimica, Università di Trieste, Via L. Giorgeri 1-I-34127 Trieste, Italy
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