1
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Mayoral E, Arcos-Casarrubias J, Gama Goicochea A. Self – assembly of model surfactants as reverse micelles in nonpolar solvents and their role as interfacial tension modifiers. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.126244] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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2
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Nonpolar Interface Composition in Cetyltrimethylammonium Bromide Reverse Micellar Environments to Control Size and Induce Anisotropy on Gold Nanoparticles. ChemistrySelect 2019. [DOI: 10.1002/slct.201903844] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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3
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Liu D, Du C, Chen Z, Wang X, Shen W. The stability boundaries of droplets of water/AOT/Dynol-604/isooctane mixed microemulsions. J DISPER SCI TECHNOL 2019. [DOI: 10.1080/01932691.2019.1650758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Doudou Liu
- School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, China
| | - Changfei Du
- School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, China
| | - Zhiyun Chen
- School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, China
| | - Xue Wang
- School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, China
| | - Weiguo Shen
- School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, China
- Department of Chemistry, Lanzhou University, Lanzhou, China
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4
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Komal, Singh G, Singh G, Kang TS. Aggregation Behavior of Sodium Dioctyl Sulfosuccinate in Deep Eutectic Solvents and Their Mixtures with Water: An Account of Solvent's Polarity, Cohesiveness, and Solvent Structure. ACS OMEGA 2018; 3:13387-13398. [PMID: 31458052 PMCID: PMC6644625 DOI: 10.1021/acsomega.8b01637] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2018] [Accepted: 10/02/2018] [Indexed: 06/09/2023]
Abstract
An anionic surfactant sodium dioctyl sulfosuccinate (AOT) aggregates in deep eutectic solvents (DESs) and their mixtures with water (up to 50% w/w) in a contrasting manner. Two DESs, a mixture of choline chloride + urea and choline chloride + ethylene glycol, commonly known as Reline and Ethaline, respectively, are used as solvents. Behavior of AOT at air-solution interface and aggregation in bulk is investigated using surface tension, conductivity, fluorescence, and dynamic light scattering measurements. The obtained results are correlated with structural aspects of solvent systems as well as with inherent properties of solvent such as Kamlet-Taft polarity parameters, degree of cohesiveness derived from Gordon parameter (G), and cohesive energy density. It is observed that the spontaneity of aggregation in neat DESs or DES-water mixtures follows a trend reflected by various solvent parameters. However, characteristic properties of aggregation in water does not fit into this trend, where critical aggregation concentration of AOT is found in between 30 and 50% (w/w) of respective DES-water mixtures. 1H NMR and 1H-1H 2D NOESY spectroscopy is employed to get insights into reason behind this anomalous behavior. It is observed that AOT forms self-assembled structures similar to that of other surfactants in neat DESs, whereas it undergoes nanosegregation in DESs-water mixtures. The present results are expected to be useful for colloidal aspects of DESs and their mixtures with water.
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Affiliation(s)
- Komal
- Department of Chemistry, UGC Sponsored
Centre for Advanced Studies-II, Guru Nanak
Dev University, Amritsar 143005, India
| | - Gagandeep Singh
- Department of Chemistry, UGC Sponsored
Centre for Advanced Studies-II, Guru Nanak
Dev University, Amritsar 143005, India
| | - Gurbir Singh
- Department of Chemistry, UGC Sponsored
Centre for Advanced Studies-II, Guru Nanak
Dev University, Amritsar 143005, India
| | - Tejwant Singh Kang
- Department of Chemistry, UGC Sponsored
Centre for Advanced Studies-II, Guru Nanak
Dev University, Amritsar 143005, India
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5
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Modulation of probe-genomic DNA interaction within the confined interior of a reverse micelle: Is the bulk-like properties of water truly achieved in large reverse micelles? Int J Biol Macromol 2018; 118:1203-1210. [PMID: 29969635 DOI: 10.1016/j.ijbiomac.2018.06.180] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2018] [Revised: 05/29/2018] [Accepted: 06/28/2018] [Indexed: 11/20/2022]
Abstract
The prime motivation of the present study is to explore the effect of reverse micellar confinement on the binding interaction of an anthracene-based probe 9-methyl anthroate with herring-sperm DNA. The structural modification of the genomic DNA from its native B-form to the non-native C-form and subsequently to the condensed Ψ-form as a function of the level of hydration (W0, defined as [water] / [surfactant]) of the reverse micellar core is found to reveal a remarkable regulatory role on the stability of the stacking interaction (intercalation) of the probe within the DNA helix; the interaction being progressively stabilized at higher W0. Particularly, a close perusal of the dynamical aspects of the interaction is found to be counter-intuitive to the popular notion of the properties of the confined water within the reverse micelles typically approaching bulk-like properties at sufficiently high hydration levels (W0 > 10).
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6
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Kar B, Ghosh P, Kundu K, Bardhan S, Paul BK, Das S. Benzimidazolium-based high temperature ionic liquid-in-oil microemulsion for regioselective nitration reaction. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.07.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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7
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Sett R, Sen S, Paul BK, Guchhait N. How Does Nanoconfinement within a Reverse Micelle Influence the Interaction of Phenazinium-Based Photosensitizers with DNA? ACS OMEGA 2018; 3:1374-1385. [PMID: 31458466 PMCID: PMC6641382 DOI: 10.1021/acsomega.7b01820] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/21/2017] [Accepted: 01/17/2018] [Indexed: 06/10/2023]
Abstract
The major focus of the present work lies in exploring the influence of nanoconfinement within aerosol-OT (AOT) reverse micelles on the binding interaction of two phenazinium-based photosensitizers, namely, phenosafranin (PSF) and safranin-O (SO), with the DNA duplex. Circular dichroism and dynamic light-scattering studies reveal the condensation of DNA within the reverse micellar interior (transformation of the B-form of native DNA to ψ-form). Our results unveil a remarkable effect of the degree of hydration of the reverse micellar core on the stability of the stacking interaction (intercalation) of the drugs (PSF and SO) into DNA; increasing size of the water nanopool (that is, w 0) accompanies decreasing curvature of the DNA duplex structure with the consequent effect of increasing stabilization of the drug:DNA intercalation. The marked differences in the dynamical aspects of the interaction scenario following encapsulation within the reverse micellar core and the subsequent dependence on the size of the water nanopool are also meticulously explored. The differential degrees of steric interactions offered by the drug molecules (presence of methyl substitutions on the planar phenazinium ring in SO) are also found to affect the extent of intercalation of the drugs to DNA. In this context, it is imperative to state that the water pool of the reverse micellar core is often argued to approach bulk-like properties of water with increasing micellar size (typically w 0 ≥ 10), so that deviation from the bulk water properties is likely to be minimized in large reverse micelles (w 0 ≥ 10). On the contrary, our results (particularly quantitative elucidation of micropolarity and dynamical aspects of the interaction) explicitly demonstrate that the bulk-like behavior of the nanoconfined water is not truly achieved even in large reverse micelles.
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Affiliation(s)
- Riya Sett
- Department
of Chemistry, University of Calcutta, 92 A. P. C. Road, Kolkata 700009, India
| | - Swagata Sen
- Department
of Chemistry, University of Calcutta, 92 A. P. C. Road, Kolkata 700009, India
| | - Bijan K. Paul
- Department
of Chemistry, Mahadevananda Mahavidyalaya, Barrackpore, Kolkata 700120, India
| | - Nikhil Guchhait
- Department
of Chemistry, University of Calcutta, 92 A. P. C. Road, Kolkata 700009, India
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8
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Hollamby MJ, Smith CF, Britton MM, Danks AE, Schnepp Z, Grillo I, Pauw BR, Kishimura A, Nakanishi T. The aggregation of an alkyl-C 60 derivative as a function of concentration, temperature and solvent type. Phys Chem Chem Phys 2018; 20:3373-3380. [PMID: 29260811 DOI: 10.1039/c7cp06348b] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Contrast-variation small-angle neutron scattering (CV-SANS), small-angle X-ray scattering (SAXS), nuclear magnetic resonance (NMR) measurements of diffusion and isothermal titration calorimetry (ITC) are used to gain insight into the aggregation of an alkyl-C60 derivative, molecule 1, in n-hexane, n-decane and toluene as a function of concentration and temperature. Results point to an associative mechanism of aggregation similar to other commonly associating molecules, including non-ionic surfactants or asphaltenes in non-aqueous solvents. Little aggregation is detected in toluene, but small micelle-like structures form in n-alkane solvents, which have a C60-rich core and alkyl-rich shell. The greatest aggregation extent is found in n-hexane, and at 0.1 M the micelles of 1 comprise around 6 molecules at 25 °C. These micelles become smaller when the concentration is lowered, or if the solvent is changed to n-decane. The solution structure is also affected by temperature, with a slightly larger aggregation extent at 10 °C than at 25 °C. At higher concentrations, for example in solutions of 1 above 0.3 M in n-decane, a bicontinuous network becomes apparent. Overall, these findings aid our understanding of the factors driving the assembly of alkyl-π-conjugated hydrophobic amphiphiles such as 1 in solution and thereby represent a step towards the ultimate goal of exploiting this phenomenon to form materials with well-defined order.
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Affiliation(s)
- Martin J Hollamby
- School of Physical and Geographical Sciences, Keele University, Keele, Staffordshire, ST55BG, UK.
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9
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Wang X, Chen Z, Shen W. The volumetric properties of water/AOT/isooctane microemulsions with small-size droplets. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.06.076] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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10
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Florez Tabares JS, Correa NM, Silber JJ, Sereno LE, Molina PG. Droplet-droplet interactions investigated using a combination of electrochemical and dynamic light scattering techniques. The case of water/BHDC/benzene:n-heptane system. SOFT MATTER 2015; 11:2952-2962. [PMID: 25727358 DOI: 10.1039/c5sm00146c] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
In this contribution the electrochemistry of [Fe(CN)6](4-/3-) as the probe molecule was investigated in benzyl-n-hexadecyldimethylammonium chloride (BHDC) reverse micelles (RMs) varying the composition of the external solvent (benzene:n-heptane mixtures) and the surfactant concentration, at a fixed water content and probe concentration. The electrochemical and dynamic light scattering results show that in water/BHDC/benzene:n-heptane systems the aggregate sizes increase on increasing BHDC concentration. This behavior was unexpected since it is known that for water/BHDC/benzene RM systems keeping the water content constant and the surfactant concentration below 0.2 M, the droplet sizes are independent of the concentration of the surfactant. We explain the results considering that on changing the external solvent to benzene:n-heptane mixtures, RMs tend to associate in clusters and equilibrium between free RMs and droplet clusters is established. A model is presented which, using electrochemical and dynamic light scattering data, allows calculating the aggregation number of the RMs, the number of RMs that form the droplet clusters and the standard electron transfer heterogeneous rate constant.
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11
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Du C, He W, Yin T, Shen W. Volumetric properties of water/AOT/isooctane microemulsions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:15135-15142. [PMID: 25489979 DOI: 10.1021/la5041344] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The densities of AOT/isooctane micelles and water/AOT/isooctane microemulsions with the molar ratios R of water to AOT being 2, 8, 10, 12, 16, 18, 20, 25, 30, and 40 were measured at 303.15 K. The apparent specific volumes of AOT and the quasi-component water/AOT at various concentrations were calculated and used to estimate the volumetric properties of AOT and water in the droplets and in the continuous oil phase, to discuss the interaction between the droplets, and to determine the critical micelle concentration and the critical microemulsion concentrations. A thermodynamic model was proposed to analysis the stability boundary of the microemulsion droplets, which confirms the maximum value of R being about 65 for the stable AOT/water/isooctane microemulsion droplets.
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Affiliation(s)
- Changfei Du
- School of Chemistry and Molecular Engineering, East China University of Science and Technology , Shanghai 200237, China
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12
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Girardi VR, Silber JJ, Mariano Correa N, Darío Falcone R. The use of two non-toxic lipophilic oils to generate environmentally friendly anionic reverse micelles without cosurfactant. Comparison with the behavior found for traditional organic non-polar solvents. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2014.05.077] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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13
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Gutierrez JA, Falcone RD, Lopez-Quintela MA, Buceta D, Silber JJ, Correa NM. On the Investigation of the Droplet-Droplet Interactions of Sodium 1,4-Bis(2-ethylhexyl) Sulfosuccinate Reverse Micelles upon Changing the External Solvent Composition and Their Impact on Gold Nanoparticle Synthesis. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201301612] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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14
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Kundu K, Paul BK. Physicochemical Investigation of Biocompatible Mixed Surfactant Reverse Micelles: III. Aqueous NaCl Solubilization, Thermodynamic Parameters of Desolubilization Process and Conductometric Studies. J SURFACTANTS DETERG 2013. [DOI: 10.1007/s11743-013-1473-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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15
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Bumajdad A, Madkour M, Shaaban E, Seoud OAE. FT-IR and 1H NMR studies of the state of solubilized water in water-in-oil microemulsions stabilized by mixtures of single- and double-tailed cationic surfactants. J Colloid Interface Sci 2013. [DOI: 10.1016/j.jcis.2012.10.071] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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16
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Klíčová L, Sebej P, Štacko P, Filippov SK, Bogomolova A, Padilla M, Klán P. CTAB/water/chloroform reverse micelles: a closed or open association model? LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:15185-15192. [PMID: 23072317 DOI: 10.1021/la303245e] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The micellization of cetyltrimethylammonium bromide (CTAB) in chloroform in the presence of water was examined. Three scenarios of the reverse micelle formation, the closed, open and Eicke's association models, were considered in the interpretation of the experimental data. The growth of the aggregates was observed through the changes of NMR signals of associated water, probing the microenvironment of the premicellar aggregates and the interior of reverse micelles. This technique if combined with isothermal titration calorimetry (ITC) revealed that hydrated surfactant premicellar aggregates are already present at ∼6 mM CTAB. NMR, ITC and conductometry were used to determine the critical micelle concentration (cmc) to be ∼40 mM CTAB. It is suggested that the variation of the cmc values reflects the fact that the NMR analysis indicated the beginning of the reverse micelle formation, whereas conductometry and ITC measurements provided the upper limit and an average value of a so-called apparent cmc, respectively. The cmc values were found to be unaffected by the water content. The presence of reverse micelles, the existence of multiple equilibria, and high polydispersity of the samples were evidenced by DOSY NMR spectroscopy. As a result, we validated Eicke's association model, according to which cyclic inverse micelles are formed by a structural reorganization of linear associates within a narrow concentration range, called the apparent cmc. New experimental results have also been gained for micellization of cetyltrimethylammonium chloride (CTAC) in chloroform in the presence of water; a similar mechanism of reverse micelle formation has been suggested.
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Affiliation(s)
- L'ubica Klíčová
- Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
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17
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Correa NM, Silber JJ, Riter RE, Levinger NE. Nonaqueous Polar Solvents in Reverse Micelle Systems. Chem Rev 2012; 112:4569-602. [DOI: 10.1021/cr200254q] [Citation(s) in RCA: 204] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- N. Mariano Correa
- Departamento de Química, Universidad Nacional de Río Cuarto, Agencia
Postal #3, C.P. X5804BYA Río Cuarto, Argentina
| | - Juana J. Silber
- Departamento de Química, Universidad Nacional de Río Cuarto, Agencia
Postal #3, C.P. X5804BYA Río Cuarto, Argentina
| | - Ruth E. Riter
- Department of Chemistry, Agnes Scott College, Decatur, Georgia 30030-3770, United
States
| | - Nancy E. Levinger
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872,
United States
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18
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Zheng P, Ma Y, Peng X, Yin T, An X, Shen W. Determination of the interaction enthalpy between microemulsion droplets by isothermal titration microcalorimetry. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:12280-12283. [PMID: 21913718 DOI: 10.1021/la2026686] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A new experimental design for the measurement of the real heat of dilution of the microemulsion droplets by isothermal titration microcalorimetry (ITC) has been reported and used to study the interaction enthalpies of the droplets for the system of water/sodium bis(2-ethylhexyl)-sulfosuccinate (AOT)/toluene. The results are in good agreement with those determined from light-scattering experiments.
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Affiliation(s)
- Peizhu Zheng
- School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China
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19
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Agazzi FM, Falcone RD, Silber JJ, Correa NM. Solvent Blends Can Control Cationic Reversed Micellar Interdroplet Interactions. The Effect of n-Heptane:Benzene Mixture on BHDC Reversed Micellar Interfacial Properties: Droplet Sizes and Micropolarity. J Phys Chem B 2011; 115:12076-84. [DOI: 10.1021/jp203014j] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Federico M. Agazzi
- Departamento de Química, Universidad Nacional de Río Cuarto, Agencia Postal # 3, C.P. X5804BYA Río Cuarto, Argentina
| | - R. Dario Falcone
- Departamento de Química, Universidad Nacional de Río Cuarto, Agencia Postal # 3, C.P. X5804BYA Río Cuarto, Argentina
| | - Juana J. Silber
- Departamento de Química, Universidad Nacional de Río Cuarto, Agencia Postal # 3, C.P. X5804BYA Río Cuarto, Argentina
| | - N. Mariano Correa
- Departamento de Química, Universidad Nacional de Río Cuarto, Agencia Postal # 3, C.P. X5804BYA Río Cuarto, Argentina
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20
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Zhu R, Lu R, Yu A. Photophysics and locations of IR125 and C152 in AOT reverse micelles. Phys Chem Chem Phys 2011; 13:20844-54. [DOI: 10.1039/c1cp21946d] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Mchedlov-Petrossyan NO, Vodolazkaya NA, Gurina YA, Sun WC, Gee KR. Medium Effects on the Prototropic Equilibria of Fluorescein Fluoro Derivatives in True and Organized Solution. J Phys Chem B 2010; 114:4551-64. [DOI: 10.1021/jp909854s] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nikolay O. Mchedlov-Petrossyan
- V.N. Karazin Kharkov National University, Svoboda Sq. 4, Kharkov, 61077, Ukraine, and Invitrogen Life Technologies, Eugene, Oregon 97402
| | - Natalya A. Vodolazkaya
- V.N. Karazin Kharkov National University, Svoboda Sq. 4, Kharkov, 61077, Ukraine, and Invitrogen Life Technologies, Eugene, Oregon 97402
| | - Yuliya A. Gurina
- V.N. Karazin Kharkov National University, Svoboda Sq. 4, Kharkov, 61077, Ukraine, and Invitrogen Life Technologies, Eugene, Oregon 97402
| | - Wei-Chuan Sun
- V.N. Karazin Kharkov National University, Svoboda Sq. 4, Kharkov, 61077, Ukraine, and Invitrogen Life Technologies, Eugene, Oregon 97402
| | - Kyle R. Gee
- V.N. Karazin Kharkov National University, Svoboda Sq. 4, Kharkov, 61077, Ukraine, and Invitrogen Life Technologies, Eugene, Oregon 97402
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22
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Huang CC, Hohn KL. Tetrakis(dimethylamino)ethylene Chemiluminescence (TDE CL) Characterization of the CMC and the Viscosity of Reversed Microemulsions. J Phys Chem B 2010; 114:2685-94. [DOI: 10.1021/jp9077618] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chien-Chang Huang
- Department of Chemical Engineering, Kansas State University, 1005 Durland Hall, Manhattan, Kansas 66506-5102
| | - Keith L. Hohn
- Department of Chemical Engineering, Kansas State University, 1005 Durland Hall, Manhattan, Kansas 66506-5102
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23
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Satpati AK, Kumbhakar M, Nath S, Pal H. Influence of Confined Water on the Photophysics of Dissolved Solutes in Reverse Micelles. Chemphyschem 2009; 10:2966-78. [DOI: 10.1002/cphc.200900527] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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24
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Moulik SP, Mitra D. Amphiphile self-aggregation: An attempt to reconcile the agreement–disagreement between the enthalpies of micellization determined by the van’t Hoff and Calorimetry methods. J Colloid Interface Sci 2009; 337:569-78. [DOI: 10.1016/j.jcis.2009.05.064] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2009] [Revised: 05/24/2009] [Accepted: 05/27/2009] [Indexed: 10/20/2022]
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25
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Valero M, Sanchez F, Gomez-Herrera C, Lopez-Cornejo P. Study of water solubilized in AOT/n-decane/water microemulsions. Chem Phys 2008. [DOI: 10.1016/j.chemphys.2008.01.048] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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26
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Baruah B, Crans DC, Levinger NE. Simple oxovanadates as multiparameter probes of reverse micelles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:6510-8. [PMID: 17489609 DOI: 10.1021/la063072y] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Using a wide range of different methods, researchers have found that the environment inside reverse micelles differs from bulk aqueous solution in many ways. Here, we present a new tool, a series of aqueous oxovanadium(V) reactions, to probe pH, viscosity, and ionic strength in the aqueous interior of reverse micelles. In addition to their potential as anionic probe analogues to phosphates, simple oxovanadium(V) compounds have equilibrium characteristics in aqueous media exquisitely sensitive to their environment. Therefore, the speciation of vanadate equilibria can be used as a parameter to characterize the intramicellar medium. Vanadate speciation is monitored through 51V NMR spectroscopy, which also yields information through chemical shifts and linewidths of spectral features. The speciation observed suggests that the relative acidity of a basic vanadate stock solution is slightly reduced in large, w0 >or= 12, reverse micelles, but that for smaller reverse micelles, speciation reflects the strong interaction of these negatively charged oxometalates with the reverse micelle and suggest an increased solution viscosity in the reverse micelles. This interpretation is obtained through different responses closely linked to the reverse micellar size and the specific conditions in the stock solutions used to form reverse micelles.
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Affiliation(s)
- Bharat Baruah
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, USA
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27
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Chen J, Zhang J, Han B, Feng X, Hou M, Li W, Zhang Z. Effect of Compressed CO2 on the Critical Micelle Concentration and Aggregation Number of AOT Reverse Micelles in Isooctane. Chemistry 2006; 12:8067-74. [PMID: 16862630 DOI: 10.1002/chem.200501593] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The effect of compressed CO2 on the critical micelle concentration (cmc) and aggregation number of sodium bis-2-ethylhexylsulfosuccinate (AOT) reverse micelles in isooctane solution was studied by UV/Vis and fluorescence spectroscopy methods in the temperature range of 303.2-318.2 K and at different pressures or mole fractions of CO2 (X(CO2)). The capacity of the reverse micelles to solubilize water was also determined by direct observation. The standard Gibbs free energy (DeltaGo(m)), standard enthalpy (DeltaHo(m)), and standard entropy (DeltaSo(m)) for the formation of the reverse micelles were calculated by using the cmc data determined. It was discovered that the cmc versus X(CO2) curve and the DeltaGo(m) versus X(CO2) curve for a fixed temperature have a minimum, and the aggregation number and water-solubilization capacity of the reverse micelles reach a maximum at the X(CO2) value corresponding to that minimum. These results indicate that CO2 at a suitable concentration favors the formation of and can stabilize AOT reverse micelles. A detailed thermodynamic study showed that the driving force for the formation of the reverse micelles is entropy.
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Affiliation(s)
- Jing Chen
- The Center for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China
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Baruah B, Roden JM, Sedgwick M, Correa NM, Crans DC, Levinger NE. When Is Water Not Water? Exploring Water Confined in Large Reverse Micelles Using a Highly Charged Inorganic Molecular Probe. J Am Chem Soc 2006; 128:12758-65. [PMID: 17002370 DOI: 10.1021/ja0624319] [Citation(s) in RCA: 160] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The interior water pool of aerosol OT (AOT) reverse micelles tends toward bulk water properties as the micelle size increases. Thus, deviations from bulk water behavior in large reverse micelles are less expected than in small reverse micelles. Probing the interior water pool of AOT reverse micelles with a highly charged decavanadate (V(10)) oligomer using (51)V NMR spectroscopy shows distinct changes in solute environment. For example, when an acidic stock solution of protonated V(10) is placed in a reverse micelle, the (51)V chemical shifts show that the V(10) is deprotonated consistent with a decreased proton concentration in the intramicellar water pool. Results indicate that a proton gradient exists inside the reverse micelles, leaving the interior neutral while the interfacial region is acidic.
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Affiliation(s)
- Bharat Baruah
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523-1872, USA
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García-Río L, Godoy A, Rodríguez-Dafonte P. Influence of the Oil on the Properties of Microemulsions as Reaction Media. European J Org Chem 2006. [DOI: 10.1002/ejoc.200600086] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Andrade SM, Teixeira C, Togashi DM, Costa SM, Sobral AJ. Self-association of free base porphyrins with aminoacid substituents in AOT reverse micelles. J Photochem Photobiol A Chem 2006. [DOI: 10.1016/j.jphotochem.2005.10.015] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Tyagi R, Lala S, Verma AK, Nandy AK, Mahato SB, Maitra A, Basu MK. Targeted delivery of arjunglucoside I using surface hydrophilic and hydrophobic nanocarriers to combat experimental leishmaniasis. J Drug Target 2005; 13:161-71. [PMID: 16036304 DOI: 10.1080/10611860500046732] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
The purpose of the present study was to investigate the therapeutic efficacy of the indigenous drug arjunglucoside I (AG) against in vivo models of experimental leishmaniasis by incorporating it in surface hydrophilic co-polymeric nanogel particles of size less than 100 nm diameter and to compare its efficacy with that of the free drug as well as the drug encapsulated in hydrophobic poly-dl-lactide (PLA) nanoparticles. The drug AG, having glucose at the terminal end of the glycosidic chain, was isolated from an indigenous source. Drug-incorporated ultra-low-sized nanogels (approximately 90 nm in diameter) composed of cross-linked random co-polymer of N-isopropylacrylamide (NIPAAM) and N-vinyl pyrrolidone(VP) were prepared, characterized and used as delivery vehicles to combat experimental leishmaniasis in hamster models. For comparison, drug-encapsulated hydrophobic nanoparticles (approximately 250 nm in diameter) made from PLA were used as a control. The drug AG was incorporated in these nanocarriers and these drug-nanocarrier complexes were physically characterized. The efficacy of lowering spleen parasite load by the free drug, as well as that incorporated in nanogels and PLA nanoparticles were examined in vivo in equimolar concentration against hamsters undergoing experimental leishmaniasis. The reduction of drug toxicity by the nanogels and PLA nanoparticles was also assessed. The efficacy in the lowering of spleen parasite load with the free drug was found to be only 38% but was much higher when the drug was incorporated in co-polymeric nanogels (79%) or in polymeric nanoparticles (75%). Both the nanocarriers were found to be effective in reducing hepatotoxicity and nephrotoxicity nearly to the same extent. It was apparent that in addition to a smaller size and better drug release profile, the contribution of other parameters, e.g. overall surface hydrophilicity or hydrophobicity of the vehicles, also play an important role in the macrophage uptake of the drug. However, whatever be the exact mechanism, being highly efficient, non-hepatotoxic and non-nephrotoxic, AG in either of the two nanoparticulate forms may have useful application in humans
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Affiliation(s)
- Richa Tyagi
- Department of Chemistry, University of Delhi, Delhi, 110 007, India
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Chakraborty I, Moulik SP. Physicochemical studies on microemulsions. J Colloid Interface Sci 2005; 289:530-41. [PMID: 16112235 DOI: 10.1016/j.jcis.2005.03.080] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2004] [Revised: 03/24/2005] [Accepted: 03/30/2005] [Indexed: 10/25/2022]
Abstract
Both volume- and temperature-induced percolation of conductance of w/o microemulsions formed with AOT in cyclic aliphatic and aromatic oils (cyclohexane, cyclohexanone, toluene, and xylenes), and volume percolation of water/AOT/oil systems using linear aliphatic hydrocarbons (n-hexane, n-heptane, n-octane, i-octane, and n-decane) have been studied. The effect of additives, viz. sodium cholate (NaC), sodium deoxycholate (NaDC), cholesterol, n-butanol, and t-butanol, toluene, and xylenes (o, m, and p) on the temperature-induced percolating processes using the oils cyclohexane and cyclohexanone has been examined. The percolation results have been analyzed in the light of scaling equation, and the energy of activation of the ion-transport phenomenon has been evaluated for both pre- and postpercolation stages. From the percolation data, the diameter of the microdispersed water droplets, their population, and surface area have been estimated. The enthalpy of dispersion of water in AOT/oil medium has been determined from isothermal titration calorimetric (ITC) measurements.
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Affiliation(s)
- Indranil Chakraborty
- Centre for Surface Science, Department of Chemistry, Jadavpur University, Kolkata-700 032, India
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Merino‐Garcia D, Andersen SI. Calorimetric Evidence about the Application of the Concept of CMC to Asphaltene Self‐Association. J DISPER SCI TECHNOL 2005. [DOI: 10.1081/dis-200045600] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Togashi DM, Costa SMB, Sobral AJFN, A. M. d'A. R. Gonsalves. Self-Aggregation of Lipophilic Porphyrins in Reverse Micelles of Aerosol OT. J Phys Chem B 2004. [DOI: 10.1021/jp037901p] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Denisio M. Togashi
- Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, 1049-001 Lisbon, Portugal, and Departamento de Química, Universidade de Coimbra, P-3000 Coimbra, Portugal
| | - Sílvia M. B. Costa
- Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, 1049-001 Lisbon, Portugal, and Departamento de Química, Universidade de Coimbra, P-3000 Coimbra, Portugal
| | - Abílio J. F. N. Sobral
- Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, 1049-001 Lisbon, Portugal, and Departamento de Química, Universidade de Coimbra, P-3000 Coimbra, Portugal
| | - A. M. d'A. R. Gonsalves
- Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, 1049-001 Lisbon, Portugal, and Departamento de Química, Universidade de Coimbra, P-3000 Coimbra, Portugal
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Dykes GM, Brierley LJ, Smith DK, McGrail PT, Seeley GJ. Supramolecular solubilisation of hydrophilic dyes by using individual dendritic branches. Chemistry 2001; 7:4730-9. [PMID: 11757666 DOI: 10.1002/1521-3765(20011105)7:21<4730::aid-chem4730>3.0.co;2-a] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Individual dendritic branches can solubilise hydrophilic dyes in apolar media. The functional group at the focal point of the dendritic branch plays a key role in the dye uptake process. Supramolecular interactions between carboxylic acid and amine groups have been shown to be effective in enabling efficient solubilisation to occur. The necessary complementarity of this interaction is further illustrated by a series of control experiments. The extent of dendritic branching (i.e. dendritic generation) plays a key role in controlling the extent of dye uptake, with higher-generation dendritic branches exhibiting more efficient uptake at lower concentrations. UV/Visible spectroscopic methods have shown that the dendritic branches, in addition to the tuning of the extent of dye uptake, also tune the optical properties of the solubilised dye and this provides further insight into the interactions occurring between the solubilised dye and the individual dendritic branches. Furthermore, it is shown that suitably functionalised dendritic branches can transport hydrophilic dyes through an apolar phase and deliver them continuously into an aqueous medium.
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Affiliation(s)
- G M Dykes
- Department of Chemistry, University of York Heslington, UK.
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Majhi PR, Moulik SP, Burke SE, Rodgers M, Palepu R. Physicochemical Investigations on the Interaction of Surfactants and Salts with Polyvinylpyrrolidone in Aqueous Medium. J Colloid Interface Sci 2001; 235:227-234. [PMID: 11254295 DOI: 10.1006/jcis.2000.7367] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Microcalorimetric investigations have been carried out onthe interaction of the surfactants sodium cholate, sodium deoxycholate, tetradecyltrimethylammonium bromide, cetyl(hexadecyl)trimethylammonium bromide, and p-tert-octylphenoxy polyoxy-ethylene ether (Triton X-100) and the salts potassium iodide, sodium benzoate, sodium bromide, and sodium salicylate with the neutral polymer polyvinylpyrrolidone (PVP). The enthalpy of dilution of the surfactants has been measured in the absence and presence of the polymer and the results are compared to determine the effect of PVP on the micellization of the surfactants and the energetics of the process. As well, the micellization activity of the surfactants in the presence of the polymer has been studied by conductometric and fluorimetric methods. The enthalpy of dilution of the salts has been measured to provide an understanding of the nature and magnitude of their interaction with PVP. Copyright 2001 Academic Press.
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Affiliation(s)
- P. R. Majhi
- Centre for Surface Science, Department of Chemistry, Jadavpur University, Calcutta, 736732, India
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