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Timm J, Marschall R. Organosilica Nanoparticles with Ordered Trimodal Porosity and Selectively Functionalized Mesopores. CHEM-ING-TECH 2021. [DOI: 10.1002/cite.202100069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Jana Timm
- University of Bayreuth Universitätsstrasse 30 95447 Bayreuth Germany
| | - Roland Marschall
- University of Bayreuth Universitätsstrasse 30 95447 Bayreuth Germany
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Calovi M, Callone E, Ceccato R, Deflorian F, Rossi S, Dirè S. Effect of the Organic Functional Group on the Grafting Ability of Trialkoxysilanes onto Graphene Oxide: A Combined NMR, XRD, and ESR Study. MATERIALS 2019; 12:ma12233828. [PMID: 31766378 PMCID: PMC6926944 DOI: 10.3390/ma12233828] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Revised: 11/15/2019] [Accepted: 11/19/2019] [Indexed: 11/16/2022]
Abstract
The functional properties displayed by graphene oxide (GO)-polymer nanocomposites are strongly affected by the dispersion ability of GO sheets in the polymeric matrix, which can be largely improved by functionalization with organosilanes. The grafting to GO of organosilanes with the general formula RSi(OCH3)3 is generally explained by the condensation reactions of silanols with GO reactive groups. In this study, the influence of the organic group on the RSi(OCH3)3 grafting ability was analyzed in depth, taking into account the interactions of the R end chain group with GO oxidized groups. Model systems composed of commercial graphene oxide reacted with 3-aminopropyltrimethoxysilane (APTMS), 3-mercaptopropyltrimethoxysilane (MPTMS), and 3-methacryloxypropyltrimethoxysilane, (MaPTMS), respectively, were characterized by natural abundance 13C, 15N and 29Si solid state nuclear magnetic resonance (NMR), x-ray diffraction (XRD), and electron spin resonance (ESR). The silane organic tail significantly impacts the grafting, both in terms of the degree of functionalization and direct interaction with GO reactive sites. Both the NMR and XRD proved that this is particularly relevant for APTMS and to a lower extent for MPTMS. Moreover, the epoxy functional groups on the GO sheets appeared to be the preferential anchoring sites for the silane condensation reaction. The characterization approach was applied to the GO samples prepared by the nitric acid etching of graphene and functionalized with the same organosilanes, which were used as a filler in acrylic coatings obtained by cataphoresis, making it possible to correlate the structural properties and the corrosion protection ability of the layers.
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Affiliation(s)
- Massimo Calovi
- Department of Industrial Engineering, University of Trento, 38123 Trento, Italy
| | - Emanuela Callone
- “Klaus Müller” Magnetic Resonance Laboratory, Department of Industrial Engineering, University of Trento, 38123 Trento, Italy
- Correspondence: (E.C.); (S.D.); Tel.: +39-04-6428-2463 (E.C.); +39-04-6128-2456 (S.D.)
| | - Riccardo Ceccato
- Department of Industrial Engineering, University of Trento, 38123 Trento, Italy
| | - Flavio Deflorian
- Department of Industrial Engineering, University of Trento, 38123 Trento, Italy
| | - Stefano Rossi
- Department of Industrial Engineering, University of Trento, 38123 Trento, Italy
| | - Sandra Dirè
- “Klaus Müller” Magnetic Resonance Laboratory, Department of Industrial Engineering, University of Trento, 38123 Trento, Italy
- Correspondence: (E.C.); (S.D.); Tel.: +39-04-6428-2463 (E.C.); +39-04-6128-2456 (S.D.)
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Kohle FFE, Hinckley JA, Li S, Dhawan N, Katt WP, Erstling JA, Werner-Zwanziger U, Zwanziger J, Cerione RA, Wiesner UB. Amorphous Quantum Nanomaterials. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1806993. [PMID: 30516861 PMCID: PMC6440210 DOI: 10.1002/adma.201806993] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Revised: 11/08/2018] [Indexed: 05/30/2023]
Abstract
In quantum materials, macroscopic behavior is governed in nontrivial ways by quantum phenomena. This is usually achieved by exquisite control over atomic positions in crystalline solids. Here, it is demonstrated that the use of disordered glassy materials provides unique opportunities to tailor quantum material properties. By borrowing ideas from single-molecule spectroscopy, single delocalized π-electron dye systems are isolated in relatively rigid ultrasmall (<10 nm diameter) amorphous silica nanoparticles. It is demonstrated that chemically tuning the local amorphous silica environment around the dye over a range of compositions enables exquisite control over dye quantum behavior, leading to efficient probes for photodynamic therapy (PDT) and stochastic optical reconstruction microscopy (STORM). The results suggest that efficient fine-tuning of light-induced quantum behavior mediated via effects like spin-orbit coupling can be effectively achieved by systematically varying averaged local environments in glassy amorphous materials as opposed to tailoring well-defined neighboring atomic lattice positions in crystalline solids. The resulting nanoprobes exhibit features proven to enable clinical translation.
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Affiliation(s)
- Ferdinand F E Kohle
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, 14853, USA
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY, 14853, USA
| | - Joshua A Hinckley
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, 14853, USA
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY, 14853, USA
| | - Songying Li
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, 14853, USA
| | - Nikhil Dhawan
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, 14853, USA
| | - William P Katt
- Department of Molecular Medicine, Cornell University, Ithaca, NY, 14853, USA
| | - Jacob A Erstling
- Department of Biomedical Engineering, Cornell University, Ithaca, NY, 14853, USA
| | | | - Josef Zwanziger
- Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, B3H 4R2, Canada
| | - Richard A Cerione
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY, 14853, USA
- Department of Molecular Medicine, Cornell University, Ithaca, NY, 14853, USA
| | - Ulrich B Wiesner
- Department of Materials Science and Engineering, Cornell University, Ithaca, NY, 14853, USA
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Dubey AV, Gharat SB, Vijay Kumar A. Glycerol as a Recyclable Solvent for Copper-Mediated Ligand-Free C-S Cross-Coupling Reaction: Application to Synthesis of Gemmacin Precursor. ChemistrySelect 2017. [DOI: 10.1002/slct.201700684] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Abhishek V. Dubey
- Department of Chemistry; Institute of Chemical Technology, Matunga, Mumbai; Maharashtra India - 400019
| | - Siddhesh B. Gharat
- Department of Chemistry; Institute of Chemical Technology, Matunga, Mumbai; Maharashtra India - 400019
| | - A. Vijay Kumar
- Department of Chemistry; Institute of Chemical Technology, Matunga, Mumbai; Maharashtra India - 400019
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Ye Y, Zhang Q, Wang F, Li Y, Gao F, Zhang Y. Cu2+-catalyzed and H2O2-facilitated oxidation strategy for sensing copper(ii) based on cysteine-mediated aggregation of gold nanoparticles. RSC Adv 2017. [DOI: 10.1039/c7ra09750f] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
A novel colorimetric Cu2+ sensor using polyethyleneglycol-stabilized gold nanoparticles has been developed based on a cysteine/H2O2 system.
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Affiliation(s)
- Yingjie Ye
- Department of Materials and Chemical Engineering
- Henan Institute of Engineering
- Zhengzhou
- P. R. China
| | - Qian Zhang
- Department of Materials and Chemical Engineering
- Henan Institute of Engineering
- Zhengzhou
- P. R. China
| | - Fei Wang
- Department of Materials and Chemical Engineering
- Henan Institute of Engineering
- Zhengzhou
- P. R. China
| | - Yue Li
- Department of Materials and Chemical Engineering
- Henan Institute of Engineering
- Zhengzhou
- P. R. China
| | - Fengxian Gao
- Department of Materials and Chemical Engineering
- Henan Institute of Engineering
- Zhengzhou
- P. R. China
| | - Yongxing Zhang
- School of Physics and Electronic Information
- Huaibei Normal University
- Huaibei
- P. R. China
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Murugan B, Narashimhan Ramana L, Gandhi S, Sethuraman S, Krishnan UM. Engineered chemoswitchable mesoporous silica for tumor-specific cytotoxicity. J Mater Chem B 2013; 1:3494-3505. [DOI: 10.1039/c3tb20415d] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Yeh JD, Chen S. Heavy Metallic and Organometallic Ions Scavenging Using Silica-Based Adsorbent Functionalized with Ligands Containing Sulfur and Nitrogen Elements. J CHIN CHEM SOC-TAIP 2012. [DOI: 10.1002/jccs.201100322] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Synthesis and solid-state NMR characterization of cubic mesoporous silica SBA-1 functionalized with sulfonic acid groups. J Colloid Interface Sci 2011; 359:86-94. [PMID: 21507414 DOI: 10.1016/j.jcis.2011.03.072] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2011] [Revised: 03/17/2011] [Accepted: 03/22/2011] [Indexed: 11/23/2022]
Abstract
Well-ordered cubic mesoporous silicas SBA-1 functionalized with sulfonic acid groups have been synthesized through in situ oxidation of mercaptopropyl groups with H(2)O(2) via co-condensation of tetraethoxysilane (TEOS) and 3-mercaptopropyltrimethoxysilane (MPTMS) templated by cetyltriethylammonium bromide (CTEABr) under strong acidic conditions. Various synthesis parameters such as the amounts of H(2)O(2) and MPTMS on the structural ordering of the resultant materials were systematically investigated. The materials thus obtained were characterized by a variety of techniques including powder X-ray diffraction (XRD), multinuclear solid-state Nuclear Magnetic Resonance (NMR) spectroscopy, (29)Si{(1)H} 2D HETCOR (heteronuclear correlation) NMR spectroscopy, thermogravimetric analysis (TGA), and nitrogen sorption measurements. By using (13)C CPMAS NMR technique, the status of the incorporated thiol groups and their transformation to sulfonic acid groups can be monitored and, as an extension, to define the optimum conditions to be used for the oxidation reaction to be quantitative. In particular, (29)Si{(1)H} 2D HETCOR NMR revealed that the protons in sulfonic acid groups are in close proximity to the silanol Q(3) species, but not close enough to form a hydrogen bond.
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