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Physicochemical characterization of green sodium oleate-based formulations. Part 2. Effect of anions. J Colloid Interface Sci 2022; 617:399-408. [DOI: 10.1016/j.jcis.2022.01.135] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Revised: 01/20/2022] [Accepted: 01/21/2022] [Indexed: 11/23/2022]
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2
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Lipid and surfactant self-assembly: Significance of NMR in developing our understanding. Curr Opin Colloid Interface Sci 2019. [DOI: 10.1016/j.cocis.2019.08.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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3
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Lees E, Rokkam S, Shanbhag S, Gunzburger M. The electroneutrality constraint in nonlocal models. J Chem Phys 2017; 147:124102. [PMID: 28964032 DOI: 10.1063/1.5003915] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We develop a nonlocal Nernst-Planck model for reaction and diffusion in multicomponent ionic systems. We apply the model to the one-dimensional liquid junction problem, in which two electrolytic solutions of different ionic concentrations are brought into contact via a permeable membrane. Transport of ions through the membrane induces an electric field which is modeled using two separate nonlocal conditions: charge conservation and Gauss' law. We investigate how well they satisfy the criterion of strict electroneutrality which stipulates that the net charge at each point in the domain is zero, by considering four different initial scenarios. Charge conservation and Gauss' law yield similar results for most practical scenarios in which the initial condition satisfies strict electroneutrality. However, Gauss' law has two important advantages over charge conservation: (i) it is numerically more stable and can be applied even when the concentration of all the charged species drops to zero and (ii) computationally, it is significantly cheaper. Further, this study provides insights on the prescription of electroneutrality conditions necessary to handle the physics of evolving charges in nonlocal peridynamic models that are aimed at modeling nonlocal reaction-diffusion or corrosion-type processes.
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Affiliation(s)
- Eitan Lees
- Department of Scientific Computing, Florida State University, Tallahassee, Florida 32306, USA
| | - Srujan Rokkam
- Advanced Cooling Technologies, Inc., Lancaster, Pennsylvania 17601, USA
| | - Sachin Shanbhag
- Department of Scientific Computing, Florida State University, Tallahassee, Florida 32306, USA
| | - Max Gunzburger
- Department of Scientific Computing, Florida State University, Tallahassee, Florida 32306, USA
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4
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Monduzzi M, Lampis S, Murgia S, Salis A. From self-assembly fundamental knowledge to nanomedicine developments. Adv Colloid Interface Sci 2014; 205:48-67. [PMID: 24182715 DOI: 10.1016/j.cis.2013.10.009] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2013] [Revised: 10/08/2013] [Accepted: 10/08/2013] [Indexed: 02/01/2023]
Abstract
This review highlights the key role of NMR techniques in demonstrating the molecular aspects of the self-assembly of surfactant molecules that nowadays constitute the basic knowledge which modern nanoscience relies on. The aim is to provide a tutorial overview. The story of a rigorous scientific approach to understand self-assembly in surfactant systems and biological membranes starts in the early seventies when the progresses of SAXRD and NMR technological facilities allowed to demonstrate the existence of ordered soft matter, and the validity of Tanford approach concerning self-assembly at a molecular level. Particularly, NMR quadrupolar splittings, NMR chemical shift anisotropy, and NMR relaxation of dipolar and quadrupolar nuclei in micellar solutions, microemulsions, and liquid crystals proved the existence of an ordered polar-apolar interface, on the NMR time scale. NMR data, rationalized in terms of the two-step model of relaxation, allowed to quantify the dynamic aspects of the supramolecular aggregates in different soft matter systems. In addition, NMR techniques allowed to obtain important information on counterion binding as well as on size of the aggregate through molecular self-diffusion. Indeed NMR self-diffusion proved without any doubt the existence of bicontinuous microemulsions and bicontinuous cubic liquid crystals, suggested by pioneering and brilliant interpretation of SAXRD investigations. Moreover, NMR self-diffusion played a fundamental role in the understanding of microemulsion and emulsion nanostructures, phase transitions in phase diagrams, and particularly percolation phenomena in microemulsions. Since the nineties, globalization of the knowledge along with many other technical facilities such as electron microscopy, particularly cryo-EM, produced huge progresses in surfactant and colloid science. Actually we refer to nanoscience: bottom up/top down strategies allow to build nanodevices with applications spanning from ICT to food technology. Developments in the applied fields have also been addressed by important progresses in theoretical skills aimed to understand intermolecular forces, and specific ion interactions. Nevertheless, this is still an open question. Our predictive ability has however increased, hence more ambitious targets can be planned. Nanomedicine represents a major challenging field with its main aims: targeted drug delivery, diagnostic, theranostics, tissue engineering, and personalized medicine. Few recent examples will be mentioned. Although the real applications of these systems still need major work, nevertheless new challenges are open, and perspectives based on integrated multidisciplinary approaches would enable both a deeper basic knowledge and the expected advances in biomedical field.
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Affiliation(s)
- Maura Monduzzi
- Dept. Scienze Chimiche e Geologiche, CNBS & CSGI, University of Cagliari, SS 554 Bivio Sestu, 09042 Monserrato, CA, Italy.
| | - Sandrina Lampis
- Dept. Scienze Chimiche e Geologiche, CNBS & CSGI, University of Cagliari, SS 554 Bivio Sestu, 09042 Monserrato, CA, Italy
| | - Sergio Murgia
- Dept. Scienze Chimiche e Geologiche, CNBS & CSGI, University of Cagliari, SS 554 Bivio Sestu, 09042 Monserrato, CA, Italy
| | - Andrea Salis
- Dept. Scienze Chimiche e Geologiche, CNBS & CSGI, University of Cagliari, SS 554 Bivio Sestu, 09042 Monserrato, CA, Italy
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5
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Patra A, Luong TQ, Mitra RK, Havenith M. Solvent dynamics in a reverse micellar water-pool: a spectroscopic investigation of DDAB–cyclohexane–water systems. Phys Chem Chem Phys 2013. [DOI: 10.1039/c2cp42560b] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Law SJ, Britton MM. Sizing of reverse micelles in microemulsions using NMR measurements of diffusion. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:11699-11706. [PMID: 22794150 DOI: 10.1021/la300796u] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
This paper reports the size of reverse micelles (RMs) in AOT/octane/H(2)O and CTAB/hexanol/H(2)O microemulsions using magnetic resonance (MR) pulsed field gradient (PFG) measurements of diffusion. Diffusion data were measured using the pulsed gradient stimulated echo (PGSTE) experiment for surfactant molecules residing in the RM interface. Inverse Laplace transformation of these data generated diffusion coefficients for the RMs, which were converted into hydrodynamic radii using the Stokes-Einstein relation. This technique is complementary to those previously used to size RMs, such as dynamic light scattering (DLS) and small-angle X-ray scattering (SAXS), but also offers several advantages, which are discussed. RM sizes, determined using the PGSTE method, in the AOT (sodium bis(2-ethylhexyl) sulfosuccinate) and CTAB (cetyltrimethylammonium bromide) microemulsions were compared with previous DLS and SAXS data, showing good agreement. Methods for determining number distributions from the PGSTE data, through the use of scaling factors, were investigated.
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Affiliation(s)
- Susan J Law
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom
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7
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Murgia S, Monduzzi M, Palazzo G. Quantification of specific anion binding to non-ionic Triton X-100 micelles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:1283-1289. [PMID: 22149392 DOI: 10.1021/la203918d] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Anion binding to nonionic micelles was quantified by self-diffusion. Four anions were probed by multinuclear PGSTE NMR measurements in a Triton X-100 micellar aqueous solution. The salt concentration used was sufficiently low to avoid any micellar growth affecting surface curvature. The micellar aggregates that provide a model surface are uncharged with hydrophilic headgroups so that electrostatic ion surface interactions play little or no role in prescribing specific anion binding. Anionic affinity to the micellar surface followed a Hofmeister series, (CH(3))(2)AsO(2)(-) ≫ CH(3)COO(-) > H(2)PO(4)(-) > F(-). The observed ion specificity is rationalized by calling into play the nonelectrostatic interactions occurring between the anions and the micellar surface.
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Affiliation(s)
- Sergio Murgia
- Department of Chemical Science, University of Cagliari, CNBS, and CSGI, ss 554, bivio Sestu, 09042 Monserrato (CA), Italy.
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8
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De Santis S, Gabrielli A, Palombo M, Maraviglia B, Capuani S. Non-Gaussian diffusion imaging: a brief practical review. Magn Reson Imaging 2011; 29:1410-6. [PMID: 21601404 DOI: 10.1016/j.mri.2011.04.006] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2010] [Revised: 02/15/2011] [Accepted: 04/03/2011] [Indexed: 11/30/2022]
Abstract
The departure from purely mono-exponential decay of the signal, as observed from brain tissue following a diffusion-sensitized sequence, has prompted the search for alternative models to characterize these unconventional water diffusion dynamics. Several approaches have been proposed in the last few years. While multi-exponential models have been applied to characterize brain tissue, several unresolved controversies about the interpretations of the results have motivated the search for alternative models that do not rely on the Gaussian diffusion hypothesis. In this brief review, diffusional kurtosis imaging (DKI) and anomalous diffusion imaging (ADI) techniques are addressed and compared with diffusion tensor imaging. Theoretical and experimental issues are briefly described to allow readers to understand similarities, differences and limitations of these two non-Gaussian models. However, since the ultimate goal is to improve specificity, sensitivity and spatial localization of diffusion MRI for the detection of brain diseases, special attention will be paid on the clinical feasibility of the proposed techniques as well as on the context of brain pathology investigations.
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Affiliation(s)
- Silvia De Santis
- Physics Department, Sapienza University of Rome, P.le A. Moro 5, 00185 Rome, Italy.
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9
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Murgia S, Palazzo G, Mamusa M, Lampis S, Monduzzi M. Aerosol-OT in water forms fully-branched cylindrical direct micelles in the presence of the ionic liquid 1-butyl-3-methylimidazolium bromide. Phys Chem Chem Phys 2011; 13:9238-45. [DOI: 10.1039/c1cp20209j] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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10
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Nostro PL, Murgia S, Lagi M, Fratini E, Karlsson G, Almgren M, Monduzzi M, Ninham BW, Baglioni P. Interconnected Networks: Structural and Dynamic Characterization of Aqueous Dispersions of Dioctanoylphosphatidylcholine. J Phys Chem B 2008; 112:12625-34. [DOI: 10.1021/jp803983t] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Pierandrea Lo Nostro
- Department of Chemistry and CSGI, University of Florence, via della Lastruccia 3, 50019 Sesto Fiorentino, Firenze, Italy, Department of Chemistry and CSGI, University of Cagliari, Cittadella Universitaria Monserrato, S.S. 554 Bivio Sestu, 09042 Monserrato, Cagliari, Italy, Department of Physical and Analytical Chemistry, Uppsala University, Uppsala SE-751 23, Sweden, and Department of Applied Mathematics, Research School of Physical Sciences and Engineering, Institute of Advanced Studies, Australian
| | - Sergio Murgia
- Department of Chemistry and CSGI, University of Florence, via della Lastruccia 3, 50019 Sesto Fiorentino, Firenze, Italy, Department of Chemistry and CSGI, University of Cagliari, Cittadella Universitaria Monserrato, S.S. 554 Bivio Sestu, 09042 Monserrato, Cagliari, Italy, Department of Physical and Analytical Chemistry, Uppsala University, Uppsala SE-751 23, Sweden, and Department of Applied Mathematics, Research School of Physical Sciences and Engineering, Institute of Advanced Studies, Australian
| | - Marco Lagi
- Department of Chemistry and CSGI, University of Florence, via della Lastruccia 3, 50019 Sesto Fiorentino, Firenze, Italy, Department of Chemistry and CSGI, University of Cagliari, Cittadella Universitaria Monserrato, S.S. 554 Bivio Sestu, 09042 Monserrato, Cagliari, Italy, Department of Physical and Analytical Chemistry, Uppsala University, Uppsala SE-751 23, Sweden, and Department of Applied Mathematics, Research School of Physical Sciences and Engineering, Institute of Advanced Studies, Australian
| | - Emiliano Fratini
- Department of Chemistry and CSGI, University of Florence, via della Lastruccia 3, 50019 Sesto Fiorentino, Firenze, Italy, Department of Chemistry and CSGI, University of Cagliari, Cittadella Universitaria Monserrato, S.S. 554 Bivio Sestu, 09042 Monserrato, Cagliari, Italy, Department of Physical and Analytical Chemistry, Uppsala University, Uppsala SE-751 23, Sweden, and Department of Applied Mathematics, Research School of Physical Sciences and Engineering, Institute of Advanced Studies, Australian
| | - Göran Karlsson
- Department of Chemistry and CSGI, University of Florence, via della Lastruccia 3, 50019 Sesto Fiorentino, Firenze, Italy, Department of Chemistry and CSGI, University of Cagliari, Cittadella Universitaria Monserrato, S.S. 554 Bivio Sestu, 09042 Monserrato, Cagliari, Italy, Department of Physical and Analytical Chemistry, Uppsala University, Uppsala SE-751 23, Sweden, and Department of Applied Mathematics, Research School of Physical Sciences and Engineering, Institute of Advanced Studies, Australian
| | - Mats Almgren
- Department of Chemistry and CSGI, University of Florence, via della Lastruccia 3, 50019 Sesto Fiorentino, Firenze, Italy, Department of Chemistry and CSGI, University of Cagliari, Cittadella Universitaria Monserrato, S.S. 554 Bivio Sestu, 09042 Monserrato, Cagliari, Italy, Department of Physical and Analytical Chemistry, Uppsala University, Uppsala SE-751 23, Sweden, and Department of Applied Mathematics, Research School of Physical Sciences and Engineering, Institute of Advanced Studies, Australian
| | - Maura Monduzzi
- Department of Chemistry and CSGI, University of Florence, via della Lastruccia 3, 50019 Sesto Fiorentino, Firenze, Italy, Department of Chemistry and CSGI, University of Cagliari, Cittadella Universitaria Monserrato, S.S. 554 Bivio Sestu, 09042 Monserrato, Cagliari, Italy, Department of Physical and Analytical Chemistry, Uppsala University, Uppsala SE-751 23, Sweden, and Department of Applied Mathematics, Research School of Physical Sciences and Engineering, Institute of Advanced Studies, Australian
| | - Barry W. Ninham
- Department of Chemistry and CSGI, University of Florence, via della Lastruccia 3, 50019 Sesto Fiorentino, Firenze, Italy, Department of Chemistry and CSGI, University of Cagliari, Cittadella Universitaria Monserrato, S.S. 554 Bivio Sestu, 09042 Monserrato, Cagliari, Italy, Department of Physical and Analytical Chemistry, Uppsala University, Uppsala SE-751 23, Sweden, and Department of Applied Mathematics, Research School of Physical Sciences and Engineering, Institute of Advanced Studies, Australian
| | - Piero Baglioni
- Department of Chemistry and CSGI, University of Florence, via della Lastruccia 3, 50019 Sesto Fiorentino, Firenze, Italy, Department of Chemistry and CSGI, University of Cagliari, Cittadella Universitaria Monserrato, S.S. 554 Bivio Sestu, 09042 Monserrato, Cagliari, Italy, Department of Physical and Analytical Chemistry, Uppsala University, Uppsala SE-751 23, Sweden, and Department of Applied Mathematics, Research School of Physical Sciences and Engineering, Institute of Advanced Studies, Australian
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12
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Szymański J, Patkowski A, Gapiński J, Wilk A, Hołyst R. Movement of Proteins in an Environment Crowded by Surfactant Micelles: Anomalous versus Normal Diffusion. J Phys Chem B 2006; 110:7367-73. [PMID: 16599511 DOI: 10.1021/jp055626w] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Small proteins move in crowded cell compartments by anomalous diffusion. In many of them, e.g., the endoplasmic reticulum, the proteins move between lipid membranes in the aqueous lumen. Molecular crowding in vitro offers a systematic way to study anomalous and normal diffusion in a well controlled environment not accessible in vivo. We prepared a crowded environment in vitro consisting of hexaethylene glycol monododecyl ether (C(12)E(6)) nonionic surfactant and water and observed lysozyme diffusion between elongated micelles. We have fitted the data obtained in fluorescence correlation spectroscopy using an anomalous diffusion model and a two-component normal diffusion model. For a small concentration of surfactant (below 4 wt %) the data can be fitted by single-component normal diffusion. For larger concentrations the normal diffusion fit gave two components: one very slow and one fast. The amplitude of the slow component grows with C(12)E(6) concentration. The ratio of diffusion coefficients (slow to fast) is on the order of 0.1 for all concentrations of surfactant in the solution. The fast diffusion is due to free proteins while the slow one is due to the protein-micelle complexes. The protein-micelle interaction is weak since even in a highly concentrated solution (35% of C(12)E(6)) the amplitude of the slow mode is only 10%, despite the fact that the average distance between the micelles is the same as the size of the protein. The anomalous diffusion model gave the anomaly index (r(2)(t) approximately t(alpha)), alpha monotonically decreasing from alpha = 1 (at 4% surfactant) to alpha = 0.88 (at 37% surfactant). The fits for two-component normal diffusion and anomalous diffusion were of equally good quality, but the physical interpretation was only straightforward for the former.
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Affiliation(s)
- Jedrzej Szymański
- Institute of Physical Chemistry, Polish Academy of Sciences, Department III, Kasprzaka 44/52, 01-224 Warsaw, Poland
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13
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Olla M, Semmler A, Monduzzi M, Hyde ST. From Monolayers to Bilayers: Mesostructural Evolution in DDAB/Water/Tetradecane Microemulsions. J Phys Chem B 2004. [DOI: 10.1021/jp037961v] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Maurizio Olla
- Dipartimento Chimica Inorganica ed Analitica, Università di Cagliari, and Dipartimento Scienze Chimiche, CSGI-Università di Cagliari, Cittadella Universitaria S.S. 554 bivio Sestu, Monserrato, 09042 (CA), Italy, Infineon Ventures GmbH, St.-Martin-Strasse 53, 81541 München, Germany, and Applied Maths Department, Research School of Physical Sciences, Australian National University, Canberra ACT 0200, Australia
| | - Armin Semmler
- Dipartimento Chimica Inorganica ed Analitica, Università di Cagliari, and Dipartimento Scienze Chimiche, CSGI-Università di Cagliari, Cittadella Universitaria S.S. 554 bivio Sestu, Monserrato, 09042 (CA), Italy, Infineon Ventures GmbH, St.-Martin-Strasse 53, 81541 München, Germany, and Applied Maths Department, Research School of Physical Sciences, Australian National University, Canberra ACT 0200, Australia
| | - Maura Monduzzi
- Dipartimento Chimica Inorganica ed Analitica, Università di Cagliari, and Dipartimento Scienze Chimiche, CSGI-Università di Cagliari, Cittadella Universitaria S.S. 554 bivio Sestu, Monserrato, 09042 (CA), Italy, Infineon Ventures GmbH, St.-Martin-Strasse 53, 81541 München, Germany, and Applied Maths Department, Research School of Physical Sciences, Australian National University, Canberra ACT 0200, Australia
| | - Stephen T. Hyde
- Dipartimento Chimica Inorganica ed Analitica, Università di Cagliari, and Dipartimento Scienze Chimiche, CSGI-Università di Cagliari, Cittadella Universitaria S.S. 554 bivio Sestu, Monserrato, 09042 (CA), Italy, Infineon Ventures GmbH, St.-Martin-Strasse 53, 81541 München, Germany, and Applied Maths Department, Research School of Physical Sciences, Australian National University, Canberra ACT 0200, Australia
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14
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Nagashima K, Lee, CT, Xu B, Johnston KP, DeSimone JM, Johnson CS. NMR Studies of Water Transport and Proton Exchange in Water-in-Carbon Dioxide Microemulsions. J Phys Chem B 2003. [DOI: 10.1021/jp0222705] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kaz Nagashima
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599, Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, 78712, and Department of Chemical Engineering, North Carolina State University, Raleigh, North Carolina 27695
| | - C. Ted Lee,
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599, Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, 78712, and Department of Chemical Engineering, North Carolina State University, Raleigh, North Carolina 27695
| | - Bin Xu
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599, Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, 78712, and Department of Chemical Engineering, North Carolina State University, Raleigh, North Carolina 27695
| | - Keith P. Johnston
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599, Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, 78712, and Department of Chemical Engineering, North Carolina State University, Raleigh, North Carolina 27695
| | - Joseph M. DeSimone
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599, Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, 78712, and Department of Chemical Engineering, North Carolina State University, Raleigh, North Carolina 27695
| | - Charles S. Johnson
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599, Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, 78712, and Department of Chemical Engineering, North Carolina State University, Raleigh, North Carolina 27695
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Mele S, Khan A, Monduzzi M. A didodecyldimethylammonium bromide ternary system: Characterization of three-phase stable emulsions by optical microscopy. J SURFACTANTS DETERG 2002. [DOI: 10.1007/s11743-002-0237-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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16
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Evertsson H, Stilbs P, Lindblom G, Engström S. NMR self diffusion measurements of the Monooleoylglycerol/Poly ethylene glycol/water L3 phase. Colloids Surf B Biointerfaces 2002. [DOI: 10.1016/s0927-7765(01)00311-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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17
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Pfeifer P, Ehrburger-Dolle F, Rieker TP, González MT, Hoffman WP, Molina-Sabio M, Rodríguez-Reinoso F, Schmidt PW, Voss DJ. Nearly space-filling fractal networks of carbon nanopores. PHYSICAL REVIEW LETTERS 2002; 88:115502. [PMID: 11909407 DOI: 10.1103/physrevlett.88.115502] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2001] [Revised: 10/17/2001] [Indexed: 05/23/2023]
Abstract
Small-angle x-ray scattering, nitrogen adsorption, and scanning tunneling microscopy show that a series of activated carbons host an extended fractal network of channels with dimension D(p) = 2.8-3.0 (pore fractal), channel width 15-20 A (lower end of scaling), network diameter 3000-3400 A (upper end of scaling), and porosity of 0.3-0.6. We interpret the network as a stack of quasiplanar invasion percolation clusters, formed by oxidative removal of walls between closed voids of diameter of approximately 10 A and held in registry by fibrils of the biological precursor, and point out unique applications.
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Affiliation(s)
- P Pfeifer
- Department of Physics, University of Missouri, Columbia, Missouri 65211, USA
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18
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Monduzzi M, Mele S. A Novel NMR Approach to Model Percolation in W/O Microemulsions. J Phys Chem B 2001. [DOI: 10.1021/jp012042v] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Maura Monduzzi
- Department Scienze Chimiche, and Consorzio CSGI, Cagliari University, S.S. 554, Bivio Sestu, 09042 Monserrato Cagliari, Italy
| | - Stefania Mele
- Department Scienze Chimiche, and Consorzio CSGI, Cagliari University, S.S. 554, Bivio Sestu, 09042 Monserrato Cagliari, Italy
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Lee CT, Bhargava P, Johnston KP. Percolation in Concentrated Water-in-Carbon Dioxide Microemulsions. J Phys Chem B 2000. [DOI: 10.1021/jp9941357] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- C. Ted Lee
- Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712
| | - Prashant Bhargava
- Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712
| | - Keith P. Johnston
- Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712
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22
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Caboi F, Capuzzi G, Baglioni P, Monduzzi M. Microstructure of Ca−AOT/Water/Decane w/o Microemulsions. J Phys Chem B 1997. [DOI: 10.1021/jp971274k] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Francesca Caboi
- Dipartimento Scienze Chimiche, Universita' di Cagliari, Via Ospedale 72, 09124 Cagliari, Italy, and Dipartimento di Chimica, Universita' di Firenze, Via G. Capponi 9, 50121 Firenze, Italy
| | - Giulia Capuzzi
- Dipartimento Scienze Chimiche, Universita' di Cagliari, Via Ospedale 72, 09124 Cagliari, Italy, and Dipartimento di Chimica, Universita' di Firenze, Via G. Capponi 9, 50121 Firenze, Italy
| | - Piero Baglioni
- Dipartimento Scienze Chimiche, Universita' di Cagliari, Via Ospedale 72, 09124 Cagliari, Italy, and Dipartimento di Chimica, Universita' di Firenze, Via G. Capponi 9, 50121 Firenze, Italy
| | - Maura Monduzzi
- Dipartimento Scienze Chimiche, Universita' di Cagliari, Via Ospedale 72, 09124 Cagliari, Italy, and Dipartimento di Chimica, Universita' di Firenze, Via G. Capponi 9, 50121 Firenze, Italy
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Lobry L, Ostrowsky N. Diffusion of Brownian particles trapped between two walls: Theory and dynamic-light-scattering measurements. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:12050-12056. [PMID: 9982832 DOI: 10.1103/physrevb.53.12050] [Citation(s) in RCA: 89] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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