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Abstract
In this work, monodisperse agarose gel nanoparticles were prepared using a W/O microemulsion as a template to control the size of the obtained particles. The combination of this template method with a temperature-induced gelling and a solvent exchange methodology has allowed preparing stable aqueous dispersions of monodisperse agarose gel nanoparticles in water. The average size, measured as an apparent hydrodynamic diameter, of the obtained particles was around 150 nm. The ability of the obtained hydrogel particles for the encapsulation and release of a synthetic insecticide (azamethiphos) was tested. The results evidence that the insecticide molecules encapsulated in the fabricated nanoparticles are released following a diffusion-controlled mechanism. These results combined with the biodegradability of the agarose provide the bases for the design of a new vector with application in the control of parasites in water reservoirs.
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Aferni AE, Guettari M, Tajouri T. Determination of the Water/AOT/Isooctane Reverse Micelles Size Parameters from Their Refractive Index Data. J SOLUTION CHEM 2017. [DOI: 10.1007/s10953-016-0563-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Acid Hydrolysis of Bromazepam Catalyzed by Micelles, Reverse Micelles, and Microemulsions. J CHEM-NY 2015. [DOI: 10.1155/2015/957950] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Kinetics of the acid hydrolysis of bromazepam (Bz) has been investigated in micelles, reverse micelles, and microemulcions of cetyltrimethylammonium bromide (CTAB) by spectrophotometric method. The rate of the acid hydrolysis of Bz was found to be enhanced both below and above the critical micelle concentration (CMC) of CTAB in aqueous solution. The pseudo-first-order rate constant (k′) shows an initial decrease for both low and high H+concentrations. With further increase in [CTAB], at low [H+], thek′attains an almost constant value, while, at high [H+], thek′passes through a maximum and then decreases. The kinetic data for catalysis by micelles of CTAB was interpreted with the pseudophase ion exchange (PIE) model. In CTAB/cyclohexane/1-butanol/water microemulsions, as the water to surfactant ratio (wo) increases, the physicochemical properties and droplet sizes of microemulsions significantly change and distinct changes in reaction environment can be marked. The rate of the hydrolysis reaction exhibits excellent correlation with the physicochemical properties and droplet sizes of the microemulsions and reverse micelles of CTAB. At [H+] = 0.001 M, in reverse micelles and microemulsions of CTAB, thek′of the acid hydrolysis of Bz decreases sharply followed by a slight increase with increasingwo.
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Tapp D, Taylor JM, Lubansky AS, Bain CD, Chakrabarti B. Theoretical analysis for the optical deformation of emulsion droplets. OPTICS EXPRESS 2014; 22:4523-4538. [PMID: 24663773 DOI: 10.1364/oe.22.004523] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We propose a theoretical framework to predict the three-dimensional shapes of optically deformed micron-sized emulsion droplets with ultra-low interfacial tension. The resulting shape and size of the droplet arises out of a balance between the interfacial tension and optical forces. Using an approximation of the laser field as a Gaussian beam, working within the Rayleigh-Gans regime and assuming isotropic surface energy at the oil-water interface, we numerically solve the resulting shape equations to elucidate the three-dimensional droplet geometry. We obtain a plethora of shapes as a function of the number of optical tweezers, their laser powers and positions, surface tension, initial droplet size and geometry. Experimentally, two-dimensional droplet silhouettes have been imaged from above, but their full side-on view has not been observed and reported for current optical configurations. This experimental limitation points to ambiguity in differentiating between droplets having the same two-dimensional projection but with disparate three-dimensional shapes. Our model elucidates and quantifies this difference for the first time. We also provide a dimensionless number that indicates the shape transformation (ellipsoidal to dumbbell) at a value ≈ 1.0, obtained by balancing interfacial tension and laser forces, substantiated using a data collapse.
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Agzenai Y, Lindman B, Alfredsson V, Topgaard D, Renamayor CS, Pacios IE. In Situ X-ray Polymerization: From Swollen Lamellae to Polymer–Surfactant Complexes. J Phys Chem B 2014; 118:1159-67. [DOI: 10.1021/jp411894e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yahya Agzenai
- Dpt. CC
y TT Fisicoquímicas, Facultad de Ciencias, UNED, P° Senda
del Rey 9, 28040 Madrid, Spain
- Physical Chemistry, Lund University, Box
124, SE-221 00 Lund, Sweden
| | - Björn Lindman
- Physical Chemistry, Lund University, Box
124, SE-221 00 Lund, Sweden
| | - Viveka Alfredsson
- Physical Chemistry, Lund University, Box
124, SE-221 00 Lund, Sweden
| | - Daniel Topgaard
- Physical Chemistry, Lund University, Box
124, SE-221 00 Lund, Sweden
| | - Carmen S. Renamayor
- Dpt. CC
y TT Fisicoquímicas, Facultad de Ciencias, UNED, P° Senda
del Rey 9, 28040 Madrid, Spain
| | - Isabel E. Pacios
- Dpt. CC
y TT Fisicoquímicas, Facultad de Ciencias, UNED, P° Senda
del Rey 9, 28040 Madrid, Spain
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Affiliation(s)
| | - Thomas G. Mason
- Department of Chemistry and Biochemistry,
- Department of Physics and Astronomy, and
- California NanoSystems Institute, University of California, Los Angeles, California 90095;
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Zhu X, Fryd MM, Huang JR, Mason TG. Optically probing nanoemulsion compositions. Phys Chem Chem Phys 2012; 14:2455-61. [DOI: 10.1039/c2cp23007k] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Effects of ageing conditions and block copolymer concentration on the stability and micellization of P123-Ti4+ sols prepared by the templating method. RESEARCH ON CHEMICAL INTERMEDIATES 2010. [DOI: 10.1007/s11164-010-0204-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Cushing BL, Kolesnichenko VL, O'Connor CJ. Recent advances in the liquid-phase syntheses of inorganic nanoparticles. Chem Rev 2005; 104:3893-946. [PMID: 15352782 DOI: 10.1021/cr030027b] [Citation(s) in RCA: 1255] [Impact Index Per Article: 66.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Brian L Cushing
- Advanced Materials Research Institute, University of New Orleans, Louisiana 70148-2820, USA.
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Pacios IE, Renamayor CS, Horta A, Lindman B, Thuresson K. Equilibrium between Poly(N,N-dimethylacrylamide) and the Lamellar Phase of Aerosol OT/Water. J Phys Chem B 2002. [DOI: 10.1021/jp025559v] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- I. E. Pacios
- CC. y TT. Fisicoquímicas, Facultad de Ciencias, UNED, P° Senda del Rey 9, 28040 Madrid, Spain, and Physical Chemistry 1, Center for Chemistry and Chemical Engineering, Lund University, P.O. Box 124, SSE-2211 00 Lund, Sweden
| | - C. S. Renamayor
- CC. y TT. Fisicoquímicas, Facultad de Ciencias, UNED, P° Senda del Rey 9, 28040 Madrid, Spain, and Physical Chemistry 1, Center for Chemistry and Chemical Engineering, Lund University, P.O. Box 124, SSE-2211 00 Lund, Sweden
| | - A. Horta
- CC. y TT. Fisicoquímicas, Facultad de Ciencias, UNED, P° Senda del Rey 9, 28040 Madrid, Spain, and Physical Chemistry 1, Center for Chemistry and Chemical Engineering, Lund University, P.O. Box 124, SSE-2211 00 Lund, Sweden
| | - B. Lindman
- CC. y TT. Fisicoquímicas, Facultad de Ciencias, UNED, P° Senda del Rey 9, 28040 Madrid, Spain, and Physical Chemistry 1, Center for Chemistry and Chemical Engineering, Lund University, P.O. Box 124, SSE-2211 00 Lund, Sweden
| | - K. Thuresson
- CC. y TT. Fisicoquímicas, Facultad de Ciencias, UNED, P° Senda del Rey 9, 28040 Madrid, Spain, and Physical Chemistry 1, Center for Chemistry and Chemical Engineering, Lund University, P.O. Box 124, SSE-2211 00 Lund, Sweden
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Ceraulo L, Ferrugia M, Tesoriere L, Segreto S, Livrea MA, Turco Liveri V. Interactions of melatonin with membrane models: portioning of melatonin in AOT and lecithin reversed micelles. J Pineal Res 1999; 26:108-12. [PMID: 10100737 DOI: 10.1111/j.1600-079x.1999.tb00570.x] [Citation(s) in RCA: 83] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The interaction of melatonin with water containing either sodium bis (2-ethylhexyl) sulfosuccinate (AOT) or soybean phosphatidylcholine (lecithin) reversed micelles has been investigated by UV absorption spectroscopy, at a molar ratio of melatonin:surfactant 1:800 for AOT and 1:400 for lecithin reversed micelles, and by varying the water:surfactant molar ratio (R). Our results suggest that in the presence of domains from apolar organic solvent to surfactant and to water, melatonin positions itself in the micellar phase, with a preferential location in the surfactant polar head group domain, independent of the nature of the surfactant and the amount of water encapsulated into the micellar core. Effects are due to the hydrophilic and lipophilic moieties of melatonin. The effectiveness of melatonin as an electron donor and free radical scavenger has been recently recognized. While supporting the hypothesis that melatonin may provide antioxidant protection without the benefit of receptors, present findings may suggest that the molecule could easily scavenge aqueous as well as lipophilic radicals.
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Affiliation(s)
- L Ceraulo
- Dipartimento di Chimica e Tecnologie Farmaceutiche, Palermo, Italy
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Arcoleo V, Aliotta F, Goffredi M, La Manna G, Liveri VT. Study of AOT-stabilized microemulsions of formamide and n-methylformamide dispersed in n-heptane. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 1997. [DOI: 10.1016/s0928-4931(96)00157-9] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Baptista MS, Tran CD. Electrical Conductivity, Near-Infrared Absorption, and Thermal Lens Spectroscopic Studies of Percolation of Microemulsions. J Phys Chem B 1997. [DOI: 10.1021/jp970017c] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mauricio S. Baptista
- Department of Chemistry, Marquette University, P.O. Box 1881, Milwaukee, Wisconsin 53201-1881
| | - Chieu D. Tran
- Department of Chemistry, Marquette University, P.O. Box 1881, Milwaukee, Wisconsin 53201-1881
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Structural and dynamical investigation of gelation containing water-in-oil microemulsions. Colloid Polym Sci 1996. [DOI: 10.1007/bf00656629] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Tanaka R, Okazaki K, Tsuzuki H. Abnormal Dielectric Response of Aerosol OT W/O Microemulsion in Cyclohexane at 298.15 K. CHEM LETT 1995. [DOI: 10.1246/cl.1995.1131] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Arcoleo V, Goffredi M, Liveri VT. Electrical conductivity and permittivity of water-AOT-n-heptane microemulsions. J SOLUTION CHEM 1995. [DOI: 10.1007/bf00972960] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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