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Ikehata A, Nakamura K, Ozaki Y. Extended molar absorption analysis of confined states of water in reverse micelles using near-infrared spectroscopy. Chem Phys Lett 2022. [DOI: 10.1016/j.cplett.2022.140055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Novaki LP, El Seoud OA, Lopes JCD. An FT-IR study on the structure of water solubilized by cetyltrimethylammonium bromide reverse aggregates in chloroform/n-Dodecane. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19971011220] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Ghosh SK, Ichiyanagi N, Okabayashi HF, Yoshino AH, Takeda T, O’Connor CJ. Effect of Hydration on the Very Slow Droplet–Lamellar Transition in Dioleylsulfosuccinate/Decane/Water System: A Small Angle X-ray Scattering Study. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2009. [DOI: 10.1246/bcsj.82.664] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Harpham MR, Ladanyi BM, Levinger NE. The Effect of the Counterion on Water Mobility in Reverse Micelles Studied by Molecular Dynamics Simulations. J Phys Chem B 2005; 109:16891-900. [PMID: 16853150 DOI: 10.1021/jp052773l] [Citation(s) in RCA: 96] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this study, mobility and structure of water molecules in Aerosol OT (bis(2-ethylhexyl) sulfosuccinate, AOT) reverse micelles with water content w0 = 5 and Na+, K+, Cs+ counterions have been explored with molecular dynamics (MD) simulations. Using the Faeder/Ladanyi model (J. Phys. Chem. B, 2000, 104, 1033) of the reverse micelle interior, MD simulations were performed to calculate the self-intermediate scattering function, FS(Q,t), for water hydrogen atoms that could be measured in a quasielastic neutron scattering experiment. Separate intermediate scattering functions FRS(Q,t) and FCMS(Q,t) were determined for rotational and translational motion. We find that the decay of FCMS(Q,t) is nonexponential and our analysis of the MD data indicates that this behavior arises from decreased water mobility for molecules close to the interface and from confinement-induced restrictions on the range of translational displacements. Rotational relaxation also exhibits nonexponential decay, which is consistent with relatively rapid restricted rotation and slower rotational relaxation over the full angular range. Rotational relaxation is anisotropic, with the O-H bond short-time rotational mobility considerably higher than that of the molecular dipole. This behavior is related to the decreased density of water-water hydrogen bonds in the vicinity of the interface compared to core or bulk water. We find that the interfacial mobility of water molecules is quite different for the three counterion types, but that the core mobility exhibits weak counterion dependence. Differences in interfacial mobility are strongly correlated with structural features, especially ion-water coordination, and the extent of disruption by the counterions of the water hydrogen bond network.
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Affiliation(s)
- Michael R Harpham
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, USA
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Castriciano MA, Romeo A, Villari V, Angelini N, Micali N, Scolaro LM. Aggregation Behavior of Tetrakis(4-sulfonatophenyl)porphyrin in AOT/Water/Decane Microemulsions. J Phys Chem B 2005; 109:12086-92. [PMID: 16852491 DOI: 10.1021/jp0508960] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
AOT/water/decane microemulsions have been used to entrap the water-soluble 5,10,15,20-tetrakis(4-sulfonatophenyl)porphyrin (TPPS4). Quasi-elastic light scattering technique has confirmed the confinement of the porphyrin and its various aggregates into the inner water pool. Various species have been detected as function of the size of the microemulsions, concentration of the porphyrin, pH, and aging of the solutions by using a combination of UV-vis absorption, steady fluorescence emission, fluorescence lifetime measurements, and time-resolved fluorescence anisotropy. Under neutral pH conditions, the porphyrin is present as the free base monomer (S414) in the inner water compartment, and it is free to rotate when the size of the droplet is large enough and the porphyrin concentration is low. On increasing the concentration and/or decreasing the microemulsion size, a H-dimer of the free base (S406) is prevalently formed. Aging both the S414 and S406 species leads to the formation of a new species (S424), which has been postulated as a H-type dimer of the diacid porphyrin. On decreasing the pH, the species S414 and S406 almost instantaneously convert into the diacid porphyrin, which is monomeric (S434). This latter is an intermediate in the eventual formation of J-aggregated TPPS4 (S490). A marked stability has been observed for the S424 species, which do not interconvert on changing the pH of the bulk aqueous phase.
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Affiliation(s)
- Maria Angela Castriciano
- Dipartimento di Chimica Inorganica, Chimica Analitica e Chimica Fisica, Università di Messina, Salita Sperone 31, 98166 Vill. S. Agata, Messina, Italy
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Castriciano MA, Romeo A, Villari V, Micali N, Scolaro LM. Nanosized Porphyrin J-Aggregates in Water/AOT/Decane Microemulsions. J Phys Chem B 2004. [DOI: 10.1021/jp048712p] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Maria Angela Castriciano
- Dipartimento di Chimica Inorganica, Chimica Analitica e Chimica Fisica, Università di Messina, Salita Sperone 31, 98166 Vill.S.Agata, Messina, Italy, INFM, Unità di Messina, Messina, Italy, and CNR - Istituto per i Processi Chimico-Fisici, sez. Messina, Via La Farina 237, 98123, Messina, Italy
| | - Andrea Romeo
- Dipartimento di Chimica Inorganica, Chimica Analitica e Chimica Fisica, Università di Messina, Salita Sperone 31, 98166 Vill.S.Agata, Messina, Italy, INFM, Unità di Messina, Messina, Italy, and CNR - Istituto per i Processi Chimico-Fisici, sez. Messina, Via La Farina 237, 98123, Messina, Italy
| | - Valentina Villari
- Dipartimento di Chimica Inorganica, Chimica Analitica e Chimica Fisica, Università di Messina, Salita Sperone 31, 98166 Vill.S.Agata, Messina, Italy, INFM, Unità di Messina, Messina, Italy, and CNR - Istituto per i Processi Chimico-Fisici, sez. Messina, Via La Farina 237, 98123, Messina, Italy
| | - Norberto Micali
- Dipartimento di Chimica Inorganica, Chimica Analitica e Chimica Fisica, Università di Messina, Salita Sperone 31, 98166 Vill.S.Agata, Messina, Italy, INFM, Unità di Messina, Messina, Italy, and CNR - Istituto per i Processi Chimico-Fisici, sez. Messina, Via La Farina 237, 98123, Messina, Italy
| | - Luigi Monsù Scolaro
- Dipartimento di Chimica Inorganica, Chimica Analitica e Chimica Fisica, Università di Messina, Salita Sperone 31, 98166 Vill.S.Agata, Messina, Italy, INFM, Unità di Messina, Messina, Italy, and CNR - Istituto per i Processi Chimico-Fisici, sez. Messina, Via La Farina 237, 98123, Messina, Italy
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Harpham MR, Ladanyi BM, Levinger NE, Herwig KW. Water motion in reverse micelles studied by quasielastic neutron scattering and molecular dynamics simulations. J Chem Phys 2004; 121:7855-68. [PMID: 15485248 DOI: 10.1063/1.1792592] [Citation(s) in RCA: 128] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Motion of water molecules in Aerosol OT [sodium bis(2-ethylhexyl) sulfosuccinate, AOT] reverse micelles with water content w(0) ranging from 1 to 5 has been explored both experimentally through quasielastic neutron scattering (QENS) and with molecular dynamics (MD) simulations. The experiments were performed at the energy resolution of 85 microeV over the momentum transfer (Q) range of 0.36-2.53 A(-1) on samples in which the nonpolar phase (isooctane) and the AOT alkyl chains were deuterated, thereby suppressing their contribution to the QENS signal. QENS results were analyzed via a jump-diffusion/isotropic rotation model, which fits the results reasonably well despite the fact that confinement effects are not explicitly taken into account. This analysis indicates that in reverse micelles with low-water content (w(0)=1 and 2.5) translational diffusion rate is too slow to be detected, while for w(0)=5 the diffusion coefficient is much smaller than for bulk water. Rotational diffusion coefficients obtained from this analysis increase with w(0) and are smaller than for bulk water, but rotational mobility is less drastically reduced than translational mobility. Using the Faeder/Ladanyi model [J. Phys. Chem. B 104, 1033 (2000)] of reverse micelle interior, MD simulations were performed to calculate the self-intermediate scattering function F(S)(Q,t) for water hydrogens. Comparison of the time Fourier transform of this F(S)(Q,t) with the QENS dynamic structure factor S(Q,omega), shows good agreement between the model and experiment. Separate intermediate scattering functions F(S) (R)(Q,t) and F(S) (CM)(Q,t) were determined for rotational and translational motion. Consistent with the decoupling approximation used in the analysis of QENS data, the product of F(S) (R)(Q,t) and F(S) (CM)(Q,t) is a good approximation to the total F(S)(Q,t). We find that the decay of F(S) (CM)(Q,t) is nonexponential and our analysis of the MD data indicates that this behavior is due to lower water mobility close to the interface and to confinement-induced restrictions on the range of translational displacements. Rotational relaxation also exhibits nonexponential decay. However, rotational mobility of O-H bond vectors in the interfacial region remains fairly high due to the lower density of water-water hydrogen bonds in the vicinity of the interface.
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Affiliation(s)
- Michael R Harpham
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523-1872, USA
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Aoudia M, Rodgers MAJ. Photoprocesses in AOT Reverse Micelles Containing Metalloporphyrins and Oligopeptides. J Phys Chem B 2003. [DOI: 10.1021/jp027106w] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- M. Aoudia
- Department of Chemistry, College of Science, Sultan Qaboos University, P.O. Box 36, Al-Khod, Sultanate of Oman, and Center for Photochemical Science, Department of Chemistry, Bowling Green State University, Bowling Green, Ohio 43403
| | - M. A. J. Rodgers
- Department of Chemistry, College of Science, Sultan Qaboos University, P.O. Box 36, Al-Khod, Sultanate of Oman, and Center for Photochemical Science, Department of Chemistry, Bowling Green State University, Bowling Green, Ohio 43403
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Freda M, Onori G, Paciaroni A, Santucci A. Elastic neutron scattering investigation of AOT–D2O–CCl4 systems in the reverse micellar phase. Chem Phys Lett 2001. [DOI: 10.1016/s0009-2614(01)01123-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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11
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Fioretto D, Freda M, Mannaioli S, Onori G, Santucci A. Infrared and Dielectric Study of Ca(AOT)2 Reverse Micelles. J Phys Chem B 1999. [DOI: 10.1021/jp9837028] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- D. Fioretto
- Istituto per la Fisica della Materia, Unità di Perugia and Dipartimento di Fisica, Università di Perugia, Via Pascoli, I-06100 Perugia, Italy, and Dipartimento di Fisica and Istituto per la Fisica della Materia, Unità di Tor Vergata, Via della Ricerca Scientifica,1 I-00133 Roma, Italy
| | - M. Freda
- Istituto per la Fisica della Materia, Unità di Perugia and Dipartimento di Fisica, Università di Perugia, Via Pascoli, I-06100 Perugia, Italy, and Dipartimento di Fisica and Istituto per la Fisica della Materia, Unità di Tor Vergata, Via della Ricerca Scientifica,1 I-00133 Roma, Italy
| | - S. Mannaioli
- Istituto per la Fisica della Materia, Unità di Perugia and Dipartimento di Fisica, Università di Perugia, Via Pascoli, I-06100 Perugia, Italy, and Dipartimento di Fisica and Istituto per la Fisica della Materia, Unità di Tor Vergata, Via della Ricerca Scientifica,1 I-00133 Roma, Italy
| | - G. Onori
- Istituto per la Fisica della Materia, Unità di Perugia and Dipartimento di Fisica, Università di Perugia, Via Pascoli, I-06100 Perugia, Italy, and Dipartimento di Fisica and Istituto per la Fisica della Materia, Unità di Tor Vergata, Via della Ricerca Scientifica,1 I-00133 Roma, Italy
| | - A. Santucci
- Istituto per la Fisica della Materia, Unità di Perugia and Dipartimento di Fisica, Università di Perugia, Via Pascoli, I-06100 Perugia, Italy, and Dipartimento di Fisica and Istituto per la Fisica della Materia, Unità di Tor Vergata, Via della Ricerca Scientifica,1 I-00133 Roma, Italy
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Pant D, Riter RE, Levinger NE. Influence of restricted environment and ionic interactions on water solvation dynamics. J Chem Phys 1998. [DOI: 10.1063/1.477666] [Citation(s) in RCA: 110] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Riter RE, Undiks EP, Kimmel JR, Levinger NE. Formamide in Reverse Micelles: Restricted Environment Effects on Molecular Motion. J Phys Chem B 1998. [DOI: 10.1021/jp981058r] [Citation(s) in RCA: 127] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ruth E. Riter
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872
| | - Erik P. Undiks
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872
| | - Joel R. Kimmel
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872
| | - Nancy E. Levinger
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872
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Riter RE, Undiks EP, Levinger NE. Impact of Counterion on Water Motion in Aerosol OT Reverse Micelles. J Am Chem Soc 1998. [DOI: 10.1021/ja980087c] [Citation(s) in RCA: 205] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Novaki LP, Seoud OA. A Fourier Transform Infrared Study on the Structure of Water Solubilized by Reverse Aggregates of Sodium and Magnesium Bis(2-ethylhexyl)sulfosuccinates in Organic Solvents. J Colloid Interface Sci 1998. [DOI: 10.1006/jcis.1998.5415] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Bey Temsamani M, Maeck M, El Hassani I, Hurwitz HD. Fourier Transform Infrared Investigation of Water States in Aerosol-OT Reverse Micelles as a Function of Counterionic Nature. J Phys Chem B 1998. [DOI: 10.1021/jp971844g] [Citation(s) in RCA: 100] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- M. Bey Temsamani
- Laboratoire de Thermodynamique Electrochimique, Université Libre de Bruxelles, Campus Plaine, CP 256, Boulevard du Triomphe, 1050 Brussels, Belgium
| | - M. Maeck
- Laboratoire de Thermodynamique Electrochimique, Université Libre de Bruxelles, Campus Plaine, CP 256, Boulevard du Triomphe, 1050 Brussels, Belgium
| | - I. El Hassani
- Laboratoire de Thermodynamique Electrochimique, Université Libre de Bruxelles, Campus Plaine, CP 256, Boulevard du Triomphe, 1050 Brussels, Belgium
| | - H. D. Hurwitz
- Laboratoire de Thermodynamique Electrochimique, Université Libre de Bruxelles, Campus Plaine, CP 256, Boulevard du Triomphe, 1050 Brussels, Belgium
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Riter RE, Willard DM, Levinger NE. Water Immobilization at Surfactant Interfaces in Reverse Micelles. J Phys Chem B 1998. [DOI: 10.1021/jp973330n] [Citation(s) in RCA: 259] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ruth E. Riter
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872
| | - Dale M. Willard
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872
| | - Nancy E. Levinger
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872
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