Academic literature on the topic 'Reversed micelles'

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Journal articles on the topic "Reversed micelles"

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Mwalupindi, Averrin G., Rezik A. Agbaria, and Isiah M. Warner. "Synthesis and Characterization of the Surfactant Terbium 3-[[1,2-Bis-[[(2-Ethylhexyl)Oxy]Carbonyl]Ethyl]Thio]Succinate as a Reagent for Determining Organic Analytes." Applied Spectroscopy 48, no. 9 (September 1994): 1132–37. http://dx.doi.org/10.1366/0003702944029497.

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The surfactant terbium 3-[[1,2-bis[[(2-ethylhexyl)oxy]carbonyl]ethyl]thio]succinate has been synthesized and characterized by use of its absorption, luminescence, and microviscosity properties. In the presence of small amounts of water, this surfactant aggregates in cyclohexane to form reversed micelles containing Tb(III) counterions. The critical reverse micelle concentration has been determined to be 5.7 × 10−5 M with the use of an optical probe. Organic analytes solubilized in reverse micelles have been detected indirectly with the use of the luminescence characteristics of Tb(III) counterions. The detection scheme is based on energy transfer from the solubilized organic donor to acceptor Tb(III) counterions. Analytical figures of merit for the micellar system in the presence of organic analytes are presented. The microviscosity of the reverse micellar core has been estimated with the use of a viscosity-sensitive luminescent probe.
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Gagliardi, Mariacristina, Agnese Vincenzi, Laura Baroncelli, and Marco Cecchini. "Stabilized Reversed Polymeric Micelles as Nanovector for Hydrophilic Compounds." Polymers 15, no. 4 (February 14, 2023): 946. http://dx.doi.org/10.3390/polym15040946.

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Small hydrophilic drugs are widely used for systemic administration, but they suffer from poor absorption and fast clearance. Their nanoencapsulation can improve biodistribution, targeted delivery, and pharmaceutical efficacy. Hydrophilics are effectively encapsulated in compartmented particles, such as liposomes or extracellular vesicles, which are biocompatible but poorly customizable. Polymeric vectors can form compartmental structures, also being functionalizable. Here, we report a system composed of polymeric stabilized reversed micelles for hydrophilic drugs encapsulation. We optimized the preparation procedure, and calculated the critical micellar concentration. Then, we developed a strategy for stabilization that improves micelle stability upon dilution. We tested the drug loading and delivery capabilities with creatine as a drug molecule. Prepared stabilized reversed micelles had a size of around 130 nm and a negative z-potential around −16 mV, making them functional as a drug carrier. The creatine cargo increased micelle size and depended on the loading conditions. The higher amount of loaded creatine was around 60 μg/mg of particles. Delivery tests indicated full release within three days in micelles with the lower cargo, while higher loadings can provide a sustained release for longer times. Obtained results are interesting and encouraging to test the same system with different drug cargoes.
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Huppertz, Thom, and Cornelis G. de Kruif. "Disruption and reassociation of casein micelles during high pressure treatment: influence of whey proteins." Journal of Dairy Research 74, no. 2 (February 12, 2007): 194–97. http://dx.doi.org/10.1017/s0022029906002263.

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In the study presented in this article, the influence of added α-lactalbumin and β-lactoglobulin on the changes that occur in casein micelles at 250 and 300 MPa were investigated by in-situ measurement of light transmission. Light transmission of a serum protein-free casein micelle suspension initially increased with increasing treatment time, indicating disruption of micelles, but prolonged holding of micelles at high pressure partially reversed HP-induced increases in light transmission, suggesting reformation of micellar particles of colloidal dimensions. The presence of α-la and/or β-lg did not influence the rate and extent of micellar disruption and the rate and extent of reformation of casein particles. These data indicate that reformation of casein particles during prolonged HP treatment occurs as a result of a solvent-mediated association of the micellar fragments. During the final stages of reformation, κ-casein, with or without denatured whey proteins attached, associates on the surface of the reformed particle to provide steric stabilisation.
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Burns, Janet L., and Yeshayahu Talmon. "Cryo-TEM of micellar solutions." Proceedings, annual meeting, Electron Microscopy Society of America 45 (August 1987): 500–501. http://dx.doi.org/10.1017/s0424820100127141.

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Micelles are aggregates of amphiphilic molecules, i.e., molecules that have both a hydrophilic and a hydrophobic (lyophilic) moiety. These aggregates, in equilibrium with free molecules, may attain various shapes: spherical, spheroidal, or cylindrical, depending on concentration, temperature, and presence of other solutes in the system. In all of these aggregates the hydrophilic “heads” are in contact with water, and the hydro-phobic “tails” form a non-aqueous domain within the micelle. When the solvent is non-aqueous the situation is reversed; “inverted micelles” form where the hydrophobic “tails” point outwards into the solvent. Most structural data on micellar systems have come from indirect methods such as NMR, light and x-ray scattering. Interpretation of these data is model dependent. Only TEM is capable of producing direct images of micellar aggregates. However, precaution should be taken to preserve the labile microstructures of these systems during specimen preparation.
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Klyachko, Natalia L., Natalia G. Bogdanova, Andrei V. Levashov, and Karel Martinek. "Micellar Enzymology: Superactivity of Enzymes in Reversed Micelles of Surfactants Solvated by Water/Organic Cosolvent Mixtures." Collection of Czechoslovak Chemical Communications 57, no. 3 (1992): 625–40. http://dx.doi.org/10.1135/cccc19920625.

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Catalytic properties of α-chymotrypsin, peroxidase and laccase, dissolved in water-immiscible organic solvents by entrapping them into the reversed micelles of surfactants solvated by water/organic cosolvent (glycerol or 1,4- or 2,3-butanediol or dimethyl sulfoxide) mixtures, are studied. As micelle-forming surfactants, sodium salt of bis(2-ethylhexyl)sulfosuccinate (Aerosol OT) in n-octane or cetyltrimethylammonium bromide in n-octane/chloroform (1 : 1 by volume) mixture are used. The dependences of the catalytic activity on the surfactant solvation degree are bell-shaped. Maxima of the catalytic activity of enzymes solubilized in the micellar systems are observed at such optimum values of the surfactant solvation degree at which the size of micellar inner cavity and of the entrapped protein molecule is approximately equal. With decreasing content of water in the micellar media studied, the catalytic activity of the solubilized enzymes increases considerably, and is much (10-100 times) higher than in bulk aqueous buffers. In conclusion, possible mechanisms of the micellar effects are suggested.
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Yu, Zhi-Jian, and Ronald D. Neuman. "Giant Rodlike Reversed Micelles." Journal of the American Chemical Society 116, no. 9 (May 1994): 4075–76. http://dx.doi.org/10.1021/ja00088a052.

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MOZHAEV, VADIM V., NICOLE BEC, and CLAUDE BALNY. "Baroenzymology in Reversed Micelles." Annals of the New York Academy of Sciences 750, no. 1 Enzyme Engine (March 1995): 94–96. http://dx.doi.org/10.1111/j.1749-6632.1995.tb19933.x.

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Vos, K., C. Laane, and A. J. W. G. Visser. "SPECTROSCOPY OF REVERSED MICELLES." Photochemistry and Photobiology 45, s1 (May 1987): 863–78. http://dx.doi.org/10.1111/j.1751-1097.1987.tb07897.x.

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Correa, N. Mariano, M. Alicia Biasutti, and Juana J. Silber. "Micropolarity of Reversed Micelles: Comparison between Anionic, Cationic, and Nonionic Reversed Micelles." Journal of Colloid and Interface Science 184, no. 2 (December 1996): 570–78. http://dx.doi.org/10.1006/jcis.1996.0653.

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Faisal, Khandokar Sadique, Andrew J. Clulow, Stephanie V. MacWilliams, Todd A. Gillam, Ashlyn Austin, Marta Krasowska, and Anton Blencowe. "Microstructure‒Thermal Property Relationships of Poly(Ethylene Glycol-b-Caprolactone) Copolymers and Their Micelles." Polymers 14, no. 20 (October 16, 2022): 4365. http://dx.doi.org/10.3390/polym14204365.

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The crystallinity of polymers strongly affects their properties. For block copolymers, whereby two crystallisable blocks are covalently tethered to one another, the molecular weight of the individual blocks and their relative weight fraction are important structural parameters that control their crystallisation. In the case of block copolymer micelles, these parameters can influence the crystallinity of the core, which has implications for drug encapsulation and release. Therefore, in this study, we aimed to determine how the microstructure of poly(ethylene glycol-b-caprolactone) (PEG-b-PCL) copolymers contributes to the crystallinity of their hydrophobic PCL micelle cores. Using a library of PEG-b-PCL copolymers with PEG number-average molecular weight (Mn) values of 2, 5, and 10 kDa and weight fractions of PCL (fPCL) ranging from 0.11 to 0.67, the thermal behaviour and morphology were studied in blends, bulk, and micelles using differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WXRD), and Synchrotron wide-angle X-ray scattering (WAXS). Compared to PEG and PCL homopolymers, the block copolymers displayed reduced crystallinity in the bulk phase and the individual blocks had a large influence on the crystallisation of one another. The fPCL was determined to be the dominant contributor to the extent and order of crystallisation of the two blocks. When fPCL < 0.35, the initial crystallisation of PEG led to an amorphous PCL phase. At fPCL values between 0.35 and 0.65, PEG crystallisation was followed by PCL crystallisation, whereas this behaviour was reversed when fPCL > 0.65. For lyophilised PEG-b-PCL micelles, the crystallinity of the core increased with increasing fPCL, although the core was predominately amorphous for micelles with fPCL < 0.35. These findings contribute to understanding the relationships between copolymer microstructure and micelle core crystallinity that are important for the design and performance of micellar drug delivery systems, and the broader application of polymer micelles.
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Dissertations / Theses on the topic "Reversed micelles"

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Bandyopadhyaya, Rajdip. "Modelling Of Precipitation In Reverse Micelles." Thesis, Indian Institute of Science, 1999. http://hdl.handle.net/2005/145.

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Nanoparticles have important applications in ceramics, metal catalysts, semiconductors etc. They are normally required to be of small size (~ nm) and monodisperse. The aim of the present work is to model the formation of nanoparticles, obtained by precipitation in reverse micellar microreactors. These are dispersions of tiny water drops in a surfactant laden oil medium. Two systems were investigated: (i) Reverse micelles, having nanometer sized spherical water droplets in the micellar core and (ii) Water-in-oil emulsions, having micron-sized aqueous drops. Two modes of precipitation, namely, gas-liquid (g-1) and liquid-liquid (1-1) were studied. In each case, the models could predict the number, average size and size distribution of the particles reported in literature. Two groups have obtained widely divergent number and size of CaCO3 nanoparticles, formed by g-1 precipitation in reverse micelles. These particles are used as a fine suspension in lube-oil additives, where they serve to neutralize acid produced during combustion in engines. Kandori et al. (J. Colloid Interface Sci, 122,1988, 78) obtained particles of about 100 nm size, by passing CO2 through a reverse micellar solution, containing dissolved Ca(OH)2 in the micellar core. Roman et al. (J. Colloid Interface Sci., 144,1991, 324), instead of using lime solution; added micron-sized solid lime particles in the oil and generated the reverse micelles by in situ reaction. This is a commercial process known as overbasing. It led to a higher amount of lime in the micelles as well as unreacted lime particles in oil, at the beginning of the experiment Upon passing CO2, they got particles of only 6 nm in size, compared to 100 nm reported by Kandori et al.. Furthermore, while Kandori et al. found that one particle formed from 108 micelles, Roman et al. got one particle out of only ten micelles. We have modelled the two processes in a common framework to explain the reported disparity in particle characteristics. A time scale analysis of CO2 mass transfer, reaction, collision-fusion of micelles, nucleation, and growth of particles was carried out It showed that, in the experiments of Kandori et al., the rate limiting steps are nucleation and fusion. The analysis also indicates that the contents of a particular micelle are well mixed and reaction of lime and incoming CO2 can be treated as instantaneous. In the process of Kandori et al., the amount of lime taken initially being very small, the average number of product molecules in a micelle is well below one. Rapid Brownian coalescence and exchange of micellar contents leads to Poisson distribution of CaCO3(l) molecules formed by reaction. The low occupancy therefore suggests that most of the micelles are empty. Nucleation in a particular micelle is much slow and occurs when it has a critical number of molecules. Thus only very few micelles can nucleate. Comparison of nucleation and growth time scales - both intrinsic growth in a micelle and growth during fusion of nucleated and non-nucleated micelles - show that growth is much faster than both nucleation and collision. Hence a micelle can have only one nucleus, with subsequent growth during collisions. A population balance equation (PBE) is written involving the above steps. Solution of the moments of the distribution yields the number of CaCO3 particles, its size, coefficient of variance (COV) etc. The model not only predicts the ratio of number of micelles to particles, obtained experimentally as 108, but also captures the maxima in this quantity with increasing micellar size. The increase in average particle size with micellar size is also predicted well. The process of of Roman et ai, in addition, involves the time scale of solubilization of solid lime into micelles. Its comparison with other time scales demarcates their experiments into two distinct phases. Phase I consists of reaction of lime initially present in micelles. Time scale analysis also suggests that, as the lime content in the micelles is large, a high degree of supersaturation is rapidly generated. This results in a burst of nuclei. The other conclusions, like, well-mixed micelle, Poisson distribution of CaCO3(l) molecules, instantaneous growth and mono-nucleated micelles are found to hold good. Once the pre-existing lime is finished, relative time scales indicate that, further precipitation is controlled entirely by fresh solubilization of lime. This marks the beginning of phase II. However, solubilization being the slowest step, CaCO3(l) in micelles never builds up for any further nucleation. Phase II thus consists of pure growth of the particles formed in phase I. On developing more general PBEs and with solution of resulting moment equations - written separately for the two phases - the experimental data on number of particles and temporal evolution to the final particle size of 6 nm could be predicted very well. The model also captures the qualitative trend in COV of particle radius with time. Thus within the same framework we could successfully predict both the results, differing by seven orders of magnitude. The above analysis indicates that relative rates of nucleation, fusion-growth and mass transfer of gas controls the carbonation process. We further simplify the process and obtain an analytical solution in the limit of instantaneous mass transfer. The solution gives close first estimates for both the experiments and also indicates the smallest panicle size that could be obtained for a given experimental condition. In contrast to g-1 mode, precipitation in 1-1 mode - using two reverse micellar solutions having two reactants- occurs only on coalescence of two micelles. To obviate the solution of multivariate PBEs, we have developed a general Monte Carlo (MC) simulation scheme for nanoparticle formation, using the interval of quiescence technique (IQ). Starting with a fixed number of micelles, we conduct each coalescence-redispersion and nucleation events in this population, in the ratio of their relative frequencies. Our simulation code is much more general and realistic than the scheme of Li and Park (Langmuir, 15,1999, 952). Poisson distribution with realistic micellar occupancies of reactants, binomial redispersion of solutes after fission, a nucleation rate with critical number of molecules and Brownian collision-fusion rates were used. These considerations are based on our earlier findings in g-1 precipitation and those known in the literature too. The simulation of Li and Park then becomes a special case of our code. Our simulation code was then used to predict experimental data on two systems. The results of Lianos and Thomas (Chem. Phys. Lett. 125, 1986, 299 and /. Colloid Interface 5c/., 117, 1987, 505), on number of molecules per CdS particle, as a function of micelle size and reactant concentrations have been predicted very well. For the Fe(OH)3 nanoparticles, our simulation provides a better prediction of the experimental particle size range, than that of Li and Park. Finally, 1-1 precipitation on mixing two emulsions, having respectively the two reactants, has been simulated. Here, large reactant amount leads to multiple nucleation in a single drop and renders growth rate to be finite. This requires solving a PBE for particle population in each drop. Moreover, emulsions have a drop size distribution due to independent coalescence and breakage. The IQ technique was used for handling these events. Thus a composite model of PBE and MC for a drop population was developed. Simulation of particle size distribution in MgCO3 precipitation shows that nearly monodisperse nanoparticles can be produced in emulsions. Furthermore, average particle size can be controlled by changing reactant concentration in a drop. The findings of the thesis have provided new issues to be addressed in modelling nanoparticle formation. It points out the importance of finding models for coalescence efficiency and critical nuclear size in micelles. Extension of our model and simulation to precipitation in other organized surfactant assemblies can be done by starting from appropriate time scale analysis.
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Baker, Michelle K. "The extraction of cytochrome c and DsRed2 into reverse micelles /." Full text available online, 2009. http://www.lib.rowan.edu/find/theses.

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Doolittle, John William. "Synthesis of microporous faujasitic zincophosphates in novel environments." Connect to resource, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1116983708.

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Thesis (Ph.D.)--Ohio State University, 2005.
Title from first page of PDF file. Document formatted into pages; contains xxiii, 248 p.; also includes graphics. Includes bibliographical references (p. 226-248). Available online via OhioLINK's ETD Center
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Mall, Sanjay. "Studies on the transfer and refolding of lysozyme in reversed micelles." Thesis, University of Bath, 1996. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319203.

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Gardner, Adam R. "Molecular dynamics of aot/water/isooctane reverse micelles dynamic and structural analysis and effect of zirconium ions on the micelles structure for ZrO2 nanoparticle production /." abstract and full text PDF (free order & download UNR users only), 2007. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1442844.

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Sinha, Kaustav. "Approach to develop reverse micelle large-scale synthesis process for magnetic nanopowders /." abstract and full text PDF (free order & download UNR users only), 2005. http://0-wwwlib.umi.com.innopac.library.unr.edu/dissertations/fullcit/1433113.

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Thesis (M.S.)--University of Nevada, Reno, 2005.
"August, 2005." Includes bibliographical references. Library also has microfilm. Ann Arbor, Mich. : ProQuest Information and Learning Company, [2005]. 1 microfilm reel ; 35 mm. Online version available on the World Wide Web.
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Corral, Jessica Olga. "Preparation of rare-earth (Eu3+, Tb3+, and Yb3+) doped Y2O3 luminescent ceramics by the use of reverse micelles." abstract and full text PDF (free order & download UNR users only), 2004. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1434067.

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Kitchens, Christopher Lawrence Roberts Christopher B. "Metallic nanoparticle synthesis within reverse micellar micromulsion systems." Auburn, Ala., 2004. http://repo.lib.auburn.edu/EtdRoot/2004/FALL/Chemical_Engineering/Dissertation/kitchcl_13_Dissertation(abbrv).pdf.

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Hicks, Tanya Temaca. "Preparation, characterization, and activity of mono-dispersed supported catalylsts [sic]." Available online, Georgia Institute of Technology, 2004:, 2004. http://etd.gatech.edu/theses/available/etd-07212004-102914/unrestricted/hicks%5Ftanya%5Ft%5F200412%5Fms.pdf.

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Thesis (M.S.)--Chemical Engineering, Georgia Institute of Technology, 2005.
Agrawal, Pradeep K., Committee Chair ; Bommarius, Andreas S., Committee Member ; Schork, F. Joseph, Committee Member. Includes bibliographical references.
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Brochette, Pascal. "Reactivite en micelles inverses." Paris 6, 1987. http://www.theses.fr/1987PA066087.

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En utilisant l'electron hydrate comme sonde intramicellaire, etude du comportement de l'eau au sein des microphases aqueuses, et du transfert d'electron de la chlorophylle vers des viologenes dans la microemulsion
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Books on the topic "Reversed micelles"

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1949-, Hinze Willie L., ed. Reversed micelles. Greenwich, Conn: JAI Press, 1994.

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Berezin, Ilʹi͡a Vasilʹevich. Deĭstvie fermentov v obrashchennykh mit͡s︡ellakh: Dolozheno na tridt͡s︡atʹ devi͡a︡tom ezhegodnom Bakhovskom chtenii 17 marta 1983 g. Moskva: "Nauka", 1985.

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United States. National Aeronautics and Space Administration., ed. Reverse micelle based synthesis of microporous materials in microgravity: (supported by NASA grant/contract no. NAG3-1416), final report. [Washington, DC: National Aeronautics and Space Administration, 1995.

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Structure and reactivity in reverse micelles. Amsterdam: Elsevier, 1989.

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Luisi, P. L., and B. E. Straub. Reverse Micelles: Biological and Technological Relevance of Amphiphilic Structures in Apolar Media. Springer, 1999.

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Lin, Jun-Liang. Investigation and applications of micellar mobile phases in reversed phase liquid chromatography. 1988.

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Zhao, Ailian. Synthesis and reactivity of ceramic particles formed in reversed micelles. 1991.

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Biomolecules in organic solvents. Boca Raton: CRC Press, 1992.

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Hinze, Willie L. Organized Assemblies in Chemical Analysis Vol. 1: Reversed Micelles (Organized Assemblies in Chemical Analysis Vol. 1). JAI Press, 1994.

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Hall, Rex Elliot. Applications of reverse micelles in normal phase liquid chromatography. 1989.

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Book chapters on the topic "Reversed micelles"

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Dekker, Matthijs. "Reversed Micelles for Protein Purification." In Molecular Interactions in Bioseparations, 533–44. Boston, MA: Springer US, 1993. http://dx.doi.org/10.1007/978-1-4899-1872-7_35.

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Pingarrón, J. M., and A. J. Reviejo. "Amperometric Biosensors in Reversed Micelles." In Biosensors for Direct Monitoring of Environmental Pollutants in Field, 305–16. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-015-8973-4_28.

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Laane, Colja, and Matthijs Dekker. "Biotechnological Applications Of Reversed Micelles." In Surfactants in Solution, 1–13. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4613-0839-3_1.

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Leodidis, E. B., and T. A. Hatton. "Selective Solubilisation in Reversed Micelles." In The Structure, Dynamics and Equilibrium Properties of Colloidal Systems, 201–20. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-011-3746-1_14.

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Boicelli, C. A., F. Conti, M. Giomini, and A. M. Giuliani. "Water Organization in Reversed Micelles." In Physical Methods on Biological Membranes and Their Model Systems, 141–62. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4684-7538-8_11.

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Kon-no, Kijiro. "Properties and Applications of Reversed Micelles." In Surface and Colloid Science, 125–51. Boston, MA: Springer US, 1993. http://dx.doi.org/10.1007/978-1-4615-3002-2_3.

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Hasmann, Francislene Andrea, Adalberto Pessoa, and Ines Conceicao Roberto. "β-Xylosidase Recovery by Reversed Micelles." In Twenty-First Symposium on Biotechnology for Fuels and Chemicals, 1101–11. Totowa, NJ: Humana Press, 2000. http://dx.doi.org/10.1007/978-1-4612-1392-5_86.

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Goto, Masahiro, and Fumiyuki Nakashio. "Separation of Proteins by New Reversed Micelles." In Biochemical Engineering for 2001, 540–43. Tokyo: Springer Japan, 1992. http://dx.doi.org/10.1007/978-4-431-68180-9_143.

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Goto, Masahiro, Tsutomu Ono, and Shintaro Furusaki. "Reversed Micelles as Novel Protein Refolding Media." In ACS Symposium Series, 374–83. Washington, DC: American Chemical Society, 1999. http://dx.doi.org/10.1021/bk-2000-0740.ch022.

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Jolivalt, Claude, Michel Minier, and Henri Renon. "Separation of Proteins by Using Reversed Micelles." In ACS Symposium Series, 87–107. Washington, DC: American Chemical Society, 1990. http://dx.doi.org/10.1021/bk-1990-0419.ch005.

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Conference papers on the topic "Reversed micelles"

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Dhami, Suman, Juan J. Cosa, Steven M. Bishop, Mary S. C. Simpson, and David Phillips. "Photophysics of sulphonated aluminum phthalocyanines in reversed micelles." In Europto Biomedical Optics '93, edited by Giulio Jori, Johan Moan, and Willem M. Star. SPIE, 1994. http://dx.doi.org/10.1117/12.168691.

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Carnahan, N. F., and L. Quintero. "On Reversed Micelles, Supercritical Solutions, EOR and Petroleum Reservoirs." In SPE Latin America Petroleum Engineering Conference. Society of Petroleum Engineers, 1992. http://dx.doi.org/10.2118/23753-ms.

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Tran, Chieu D. "Simultaneous Enhancement Of Fluorescence And Thermal Lensing By Reversed Micelles." In 1988 Los Angeles Symposium--O-E/LASE '88, edited by E. R. Menzel. SPIE, 1988. http://dx.doi.org/10.1117/12.945441.

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Jang, Taehyung, Sebok Lee, and Yoonsoo Pang. "Ultrafast Proton Transfer Dynamics of Photoacids in the Confined Environments of Reverse Micelles." In International Conference on Ultrafast Phenomena. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/up.2022.tu4a.64.

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Deprotonation of photoacids strongly dependent on the solvent properties becomes solvent-independent in the small reverse micelles of water and methanol cores, where the deprotonation and recombination dynamics of photoacids depends on the micelle size.
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Jang, Taehyung, Sebok Lee, and Yoonsoo Pang. "Excited-state Proton Transfer Dynamics of Photoacids Confined inside the Reverse Micelles." In Frontiers in Optics. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/fio.2022.jw5a.86.

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Excited-state proton transfer dynamics of photoacids becomes independent on the solvent basicity when confined in the small reverse micelles. Deprotonation and recombination dynamics of photoacids depend on the micelle size with the water and methanol cores.
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6

Kurahashi, Kensuke, Osamu Tomioka, and Yoshihiro Meguro. "Phase Behavior and Reverse Micelle Formation in Supercritical CO2 With DTAB and F-Pentanol for Decontamination of Radioactive Wastes." In ASME 2010 13th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2010. http://dx.doi.org/10.1115/icem2010-40257.

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To develop a metal separation method using supercritical CO2 (scCO2) solvent for the decontamination process of radioactive wastes, the reverse micelle formation in scCO2 was investigated. Dodecyltrimethylammonium bromide (DTAB) as a surfactant to form the reverse micelles and 2,2,3,3,4,4,5,5-octafluoro-1-pentanol (F-pentanol) as a modifier to increase the solubility of DTAB into scCO2 were used. The reverse micelles could be formed by using 0.02 mol/dm3 DTAB and 0.45 mol/dm3 F-pentanol. A water concentration dissolved in scCO2 was increased with an increase of pressure, and 0.42 mol/dm3 water, which was 3 times larger than that in the neat CO2, could be dissolved in scCO2 at 38 MPa. Moreover, 0.1 mol/dm3 HNO3 could dissolve at the same pressure as water. On the other hand, it was found that the solubility of water at outside of reverse micelles increased with F-pentanol. The ratio of water and F-pentanol affected the phase behavior of water in scCO2.
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7

Villeneuve, Pierre, Claire Bourlieu-Lacanal, David McClements, Eric Decker, and Erwann Durand. "Lipid oxidation in emulsions and bulk oils: A review of the importance of micelles." In 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/lzak8107.

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Lipid oxidation is a major cause of quality deterioration in food or cosmetic products. In these matrices, lipids are often present in a bulk or in emulsified forms. In both systems, the rate, extent and pathway of oxidation are highly dependent on the presence of colloidal structures and interfaces because these are the locations where oxidation normally occurs. In bulk oils, reverse micelles (association colloids) are present and are believed to play a crucial role on lipid oxidation. Conversely, in emulsions, surfactant micelles are present that also play a major role in lipid oxidation pathways. This review discusses the current understanding of the influence of micellar structures on lipid oxidation. In particular, is discussed the major impact of the presence of micelles in emulsions, or reverse micelles (association colloids) in bulk oil on the oxidative stability of both systems. Indeed, both micelles in emulsions and associate colloids in bulk oil are discussed as nanoscale structures that can serve as reservoirs of antioxidants and pro-oxidants and are involved in their transport within the concerned system. Their role as nanoreactors where lipid oxidation reactions occur is also commented. Significance of your research to the AOCS membership? The results underline the importance of a better understanding of the role of micelles in the control of lipid oxidation in food or cosmetic products.
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8

Kamel, Ahmed H., and Ahmed Alzahabi. "Effects of Salinity and Temperature on Rheological and Flow Characteristics of Surfactant-Based Fluids." In ASME 2020 Fluids Engineering Division Summer Meeting collocated with the ASME 2020 Heat Transfer Summer Conference and the ASME 2020 18th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/fedsm2020-20025.

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Abstract Surfactant-based, SB fluids exhibit complex rheological behavior due to substantial structural changes caused by the molecules self-assembled colloidal aggregation. Temperature and salinity affect their rheology and flow properties. In this study, both rheological and viscoelastic properties for the optimum concentration, 4%, of Aromox® APA-T viscoelastic surfactant (VES) were investigated using two brine solutions; 2 and 4% KCl and wide range of temperatures (72°F – 200°F). Flow properties were examined using a 1/2-in. straight and coiled tubing (CR = 0.019). The results show that increasing solution salinity promotes formation of rod-like micelles and increases its flexibility. Salinity affects micelles growth and their rheological and viscoelastic behavior is very sensitive to the nature and structure of the added salt. Different molecular structures are formed; spherical micelles occur first and then increased temperature and/or salinity promotes the formation of rod-like micelles. Later, rod-like micelles are aligned in the flow direction and form a large super ordered structure of micellar bundles or aggregates called shear induced structure (SIS). Different structures implies different rheological and flow properties. Likewise, rheology improves with increasing temperature up to 100°F. Further increase in temperature reverses the effects and viscosity decreases. In addition, drag reduction and flow characteristics of SB fluids are improved by the addition of salt and/or increasing temperature up to 100°F. Results obtained are in full agreement with rheological and viscoelastic behavior of SB fluids for both salinity and temperature.
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9

Petit, C., Th Zemb, and M. P. Pileni. "Gelation of reverse micelles." In The living cell in four dimensions. AIP, 1991. http://dx.doi.org/10.1063/1.40569.

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10

Kamel, Ahmed H. "Rheological Characteristics of Surfactant-Based Fluids: A Comprehensive Study." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-86044.

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Surfactant-based fluids, SB fluids exhibit complex rheological behavior due to substantial structural change caused by the molecules self-assembled colloidal aggregation. Various factors affect their rheological properties. Among these factors, surfactant concentration, shear rate, temperature, and salinity are investigated. One of the most popular surfactants, Aromox® APA-T viscoelastic surfactant (VES) is examined. The study focuses on four different concentrations (1.5%, 2%, 3%, and 4%) over a shear rate ranging from 0.0526 sec−1 to 1944 sec−1 using Bohlin rheometer. For salinity effects, two brine solutions are used; 2 and 4% KCl while for temperature effects, a wide range from ambient temperature of 72°F up to 200°F is covered. The results show that SB fluids exhibit a complex rheological behavior due to its unique nature and the various structures form in the solution. In general, SB fluids at all concentrations exhibit a non-Newtonian pseudo-plastic shear thinning behavior. As the surfactant concentration and/or shear increases, a stronger shear thinning behavior can be seen. Increasing solution salinity promotes formation of rod-like micelles and increases its flexibility. Salinity affects micelles’ growth and their rheological behavior is very sensitive to the nature and structure of the added salt. Different molecular structures are formed; spherical micelles occur first and then increased shear rate and/or salinity promotes the formation of rod-like micelles. Later, rod-like micelles are aligned in the flow direction and form a large super ordered structure of micellar bundles or aggregates called shear induced structure (SIS). Different structures implies different rheological properties. Likewise, rheology improves with increasing temperature up to 100°F. Further increase in temperature reverses the effects and viscosity decreases. However, the effects of temperature and salinity diminish at higher shear rates. Furthermore, a rheology master curve is developed to further understand the rheological behavior of SB fluids and correlate rheological properties to its microscopic structure.
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Reports on the topic "Reversed micelles"

1

Pfund, D. M., and J. L. Fulton. Small angle X-ray scattering studies of reverse micelles in supercritical fluids. Office of Scientific and Technical Information (OSTI), October 1994. http://dx.doi.org/10.2172/28247.

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2

Skinner, James. SISGR: Water dynamics in heterogeneous and confined environments: Salt solutions, reverse micelles, and lipid multi-bilayers. Office of Scientific and Technical Information (OSTI), November 2013. http://dx.doi.org/10.2172/1104482.

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