51
|
Chakraborty A, Seth D, Setua P, Sarkar N. Dynamics of Solvent and Rotational Relaxation of Glycerol in the Nanocavity of Reverse Micelles. J Phys Chem B 2006; 110:5359-66. [PMID: 16539469 DOI: 10.1021/jp056650c] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
The dynamics of solvent and rotational relaxation of Coumarin 480 and Coumarin 490 in glycerol containing bis-2-ethyl hexyl sulfosuccinate sodium salt (AOT) reverse micelles have been investigated with steady-state and time-resolved fluorescence spectroscopy. We observed slower solvent relaxation of glycerol confined in the nanocavity of AOT reverse micelles compared to that in pure glycerol. However, the slowing down in the solvation time on going from neat glycerol to glycerol confined reverse micelles is not comparable to that on going from pure water or acetonitrile to water or acetonitrile confined AOT reverse micellar aggregates. While solvent relaxation times were found to decrease with increasing glycerol content in the reverse micellar pool, rotational relaxation times were found to increase with increase in glycerol content.
Collapse
Affiliation(s)
- Anjan Chakraborty
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, WB, India
| | | | | | | |
Collapse
|
52
|
Affiliation(s)
- Ilan Benjamin
- Department of Chemistry, University of California, Santa Cruz, California 95064, USA
| |
Collapse
|
53
|
Bauduin P, Touraud D, Kunz W, Savelli MP, Pulvin S, Ninham BW. The influence of structure and composition of a reverse SDS microemulsion on enzymatic activities and electrical conductivities. J Colloid Interface Sci 2005; 292:244-54. [PMID: 16009371 DOI: 10.1016/j.jcis.2005.05.043] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2005] [Revised: 05/17/2005] [Accepted: 05/18/2005] [Indexed: 11/16/2022]
Abstract
The activity of the enzyme horse radish peroxidase (HRP) is studied in a series of reverse microemulsions composed of dodecane, aqueous buffer, sodium dodecylsufate (SDS) and alcohols of the homologous series 1-butanol to 1-octanol. The HRP catalyzed reaction is the oxidation of a classical water soluble substrate, the 2,2-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS) by hydrogen peroxide. In parallel electrical conductivity measurements are performed on the same solutions. The structural changes in the microemulsions, as inferred by the conductivity measurements, correlate remarkably well with the changes in the enzymatic activities. In particular it is found that (a) the maximum activity of the enzyme is always related to its optimum hydration and that this hydration can be related to the microemulsion structures, (b) the enzyme inhibition caused by the alcohols in microemulsions is a consequence of both the solubility of the alcohols in the buffer and the rigidity of the interfacial film. Consequently, it can be concluded that enzymatic activity measurements are a valuable tool to study confined systems such as microemulsions and, in particular, the amount of available hydration water. Enzymatic activities can be finely tuned by small changes in microemulsion structures, probably in a predictive way.
Collapse
Affiliation(s)
- Pierre Bauduin
- Institute of Physical and Theoretical Chemistry, University of Regensburg, 93040 Regensburg, Germany
| | | | | | | | | | | |
Collapse
|
54
|
Grant CD, Steege KE, Bunagan MR, Castner EW. Microviscosity in Multiple Regions of Complex Aqueous Solutions of Poly(ethylene oxide)−Poly(propylene oxide)−Poly(ethylene oxide). J Phys Chem B 2005; 109:22273-84. [PMID: 16853900 DOI: 10.1021/jp053929k] [Citation(s) in RCA: 92] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Aqueous poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO109-PPO41-PEO109) copolymers are nonionic surfactants that self-organize to form aggregate structures with increasing temperature or concentration. We have studied two concentrations over a range of temperatures so that the copolymers are in one of three microphases: unimers, micelles, or hydrogels formed from body centered cubic aggregates of micelles. Three different coumarin dyes were chosen based on their hydrophobicity so that different aggregate regions could be probed independently-water insoluble coumarin 153 (C153), hydrophobic coumarin 102 (C102), and the hydrophilic sodium carboxylate form of coumarin 343 (C343-). Fluorescence anisotropy experiments provide detailed information on the local microviscosity. C153 experiences a fourfold increase in reorientation time and hence microviscosity with increasing temperature through the microphase transition from unimers to micelles. C102 also shows an increase in microviscosity with temperature but smaller in magnitude and with the microphase transition shifted to higher temperature relative to C153. C343- shows only a slight sensitivity to the microphase transition. For any of the three coumarin probes, fluorescence anisotropies do not show any correlation with the microphase transition to form cubic hydrogels.
Collapse
Affiliation(s)
- Christian D Grant
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, New Jersey 08854-8087, USA
| | | | | | | |
Collapse
|
55
|
Samant V, Singh AK, Ramakrishna G, Ghosh HN, Ghanty TK, Palit DK. Ultrafast Intermolecular Hydrogen Bond Dynamics in the Excited State of Fluorenone. J Phys Chem A 2005; 109:8693-704. [PMID: 16834271 DOI: 10.1021/jp050848f] [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
Steady-state fluorescence and time-resolved absorption measurements in pico- and femtosecond time domain have been used to investigate the dynamics of hydrogen bond in the excited singlet (S(1)) state of fluorenone in alcoholic solvents. A comparison of the features of the steady-state fluorescence spectra of fluorenone in various kinds of media demonstrates that two spectroscopically distinct forms of fluorenone in the S(1) state, namely the non-hydrogen-bonded (or free) molecule as well as the hydrogen-bonded complex, are responsible for the dual-fluorescence behavior of fluorenone in solutions of normal alcoholic solvents at room temperature (298 K). However, in 2,2,2-trifluoroethanol (TFE), a strong hydrogen bond donating solvent, emission from only the hydrogen-bonded complex is observed. Significant differences have also been observed in the temporal evolution of the absorption spectroscopic properties of the S(1) state of fluorenone in protic and aprotic solvents following photoexcitation using 400 nm laser pulses. An ultrafast component representing the solvent-induced vibrational energy relaxation (VER) process has been associated with the dynamics of the S(1) state of fluorenone in all kinds of solvents. However, in protic solvents, in addition to the VER process, further evolution of the spectroscopic and dynamical properties of the S(1) state have been observed because of repositioning of the hydrogen bonds around the carbonyl group. In normal alcohols, two different kinds of hydrogen-bonded complex of the fluorenone-alcohol system with different orientations of the hydrogen bond with respect to the carbonyl group and the molecular plane of fluorenone have been predicted. On the other hand, in TFE, formation of only one kind of hydrogen-bonded complex has been observed. These observations have been supported by theoretical calculations of the geometries of the hydrogen-bonded complexes in the ground and the excited states of fluorenone. Linear correlation between the lifetimes of the equilibration process occurring because of repositioning of the hydrogen bonds and Debye or longitudinal relaxation times of the normal alcoholic solvents establish the fact that, in weakly hydrogen bond donating solvents, the hydrogen bond dynamics can be described as merely a solvation process. Whereas, in TFE, hydrogen bond dynamics is better described by a process of conversion between two distinct excited states, namely, the non-hydrogen-bonded form and the hydrogen-bonded complex.
Collapse
Affiliation(s)
- Vaishali Samant
- Radiation Chemistry & Chemical Dynamics Division, Bhabha Atomic Research Center, Mumbai 400089, India
| | | | | | | | | | | |
Collapse
|
56
|
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.
Collapse
Affiliation(s)
- Michael R Harpham
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, USA
| | | | | |
Collapse
|
57
|
Tamoto Y, Segawa H, Shirota H. Solvation dynamics in aqueous anionic and cationic micelle solutions: sodium alkyl sulfate and alkyltrimethylammonium bromide. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:3757-3764. [PMID: 15835934 DOI: 10.1021/la046953i] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Solvation dynamics of the fluorescence probe, coumarin 102, in anionic surfactant, sodium alkyl sulfate (C(n)H(2n+1)SO(4)Na; n = 8, 10, 12, and 14), and cationic surfactant, alkyltrimethylammonium bromide (C(n)H(2n+1)N(CH(3))(3)Br; n = 10, 12, 14, and 16), micelle solutions have been investigated by a picosecond streak camera system. The solvation dynamics in the time range of 10(-10)-10(-8) s is characterized by a biexponential function. The faster solvation time constants are about 110-160 ps for both anionic and cationic micelle solutions, and the slower solvation time constants for sodium alkyl sulfate and alkyltrimethylammonium bromide micelle solutions are about 1.2-2.6 ns and 450-740 ps, respectively. Both the faster and the slower solvation times become slower with longer alkyl chain surfactant micelles. The alkyl-chain-length dependence of the solvation dynamics in both sodium alkyl sulfate and alkyltrimethylammonium bromide micelles can be attributed to the variation of the micellar surface density of the polar headgroup by the change of the alkyl chain length. The slower solvation time constants of sodium alkyl sulfate micelle solutions are about 3.5 times slower than those of alkyltrimethylammonium bromide micelle solutions for the same alkyl-chain-length surfactants. The interaction energies of the geometry optimized mimic clusters (H(2)O-C(2)H(5)SO(4)(-) and H(2)O-C(2)H(5)N(CH(3))(3)(+)) have been estimated by the density functional theory calculations to understand the interaction strengths between water and alkyl sulfate and alkyltrimethylammonium headgroups. The difference of the slower solvation time constants between sodium alkyl sulfate and alkyltrimethylammonium bromide micelle solutions arises likely from their different specific interactions.
Collapse
Affiliation(s)
- Yushi Tamoto
- Department of Applied Chemistry, Graduate School of Engineering, and Department of General Systems Sciences, Graduate School of Arts & Sciences, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
| | | | | |
Collapse
|
58
|
Grant CD, DeRitter MR, Steege KE, Fadeeva TA, Castner EW. Fluorescence probing of interior, interfacial, and exterior regions in solution aggregates of poly(ethylene oxide)- poly(propylene oxide)-poly(ethylene oxide) triblock copolymers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:1745-1752. [PMID: 15723468 DOI: 10.1021/la047560m] [Citation(s) in RCA: 101] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Fluorescence spectroscopy is used to probe local environments within regions of different polarity and hydrophobicity in aqueous aggregates of PEO(109)-PPO(41)-PEO(109) triblock copolymers. These copolymer aggregates have well characterized microphases in aqueous solution. Concentrations and temperatures for our studies are chosen such that the copolymers are in unimer, micellar, or micellar hydrogel forms. The observed fluorescence spectra and lifetimes from solutions individually labeled with each of the three coumarin probes report on the changes in the local polarity of the core, exterior, interfacial, and corona regions of these copolymer aggregates. This multiple fluorescence probe methodology will be straightforward to apply in general to problems in polymer and biopolymer aggregates, especially those that display strong hydrophobic effects.
Collapse
Affiliation(s)
- Christian D Grant
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, New Jersey 08854-8087, USA
| | | | | | | | | |
Collapse
|
59
|
Faeder J, Ladanyi BM. Solvation Dynamics in Reverse Micelles: The Role of Headgroup−Solute Interactions. J Phys Chem B 2005; 109:6732-40. [PMID: 16851757 DOI: 10.1021/jp045202m] [Citation(s) in RCA: 107] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
We present molecular dynamics simulation results for solvation dynamics in the water pool of anionic-surfactant reverse micelles (RMs) of varying water content, w(0). The model RMs are designed to represent water/aerosol-OT/oil systems, where aerosol-OT is the common name for sodium bis(2-ethylhexyl)sulfosuccinate. To determine the effects of chromophore-headgroup interactions on solvation dynamics, we compare the results for charge localization in model ionic diatomic chromophores that differ only in charge sign. Electronic excitation in both cases is modeled as charge localization on one of the solute sites. We find dramatic differences in the solvation responses for anionic and cationic chromophores. Solvation dynamics for the cationic chromophore are considerably slower and more strongly w(0)-dependent than those for the anionic chromophore. Further analysis indicates that the difference in the responses can be ascribed in part to the different initial locations of the two chromophores relative to the surfactant interface. In addition, slow motion of the cationic chromophore relative to the interface is the main contributor to the longer-time decay of the solvation response to charge localization in this case.
Collapse
Affiliation(s)
- James Faeder
- Theoretical Biology and Biophysics Group, MS K710, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | | |
Collapse
|
60
|
Yui H, Guo Y, Koyama K, Sawada T, John G, Yang B, Masuda M, Shimizu T. Local environment and property of water inside the hollow cylinder of a lipid nanotube. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:721-727. [PMID: 15641846 DOI: 10.1021/la040109a] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
We investigated the local environment of water confined inside the hollow cylinder of lipid nanotubes (LNTs) by time-resolved fluorescent measurements and attenuated-total-reflectance infrared (ATR-IR) spectroscopy. The LNT was obtained by self-assembly of cardanyl glucosides in water at room temperature and had an open-ended cylindrical nanospace with a diameter of 10-15 nm, a length of 10-100 microm, and hydrophilic inner and outer surfaces. We introduced a fluorescent probe of 8-anilinonaphthalene-1-sulfonate into the confined water and observed an extremely slow dynamic Stokes shift with a correlation time of 1.26 ns, which was 2-3 orders of magnitude longer than that of bulk-phase water. From the peak shift of the fluorescent spectrum, the local solvent polarity (ET(30)) of the confined water was estimated as 50 kcal/mol, which is 20% lower than that in bulk water. ATR-IR measurements showed that the hydrogen-bond network of water inside the LNT was more developed than that in bulk water at room temperature, which is in contrast to the water in other self-assembled confined geometries, such as Aerosol-OT (AOT) reversed micelles.
Collapse
Affiliation(s)
- Hiroharu Yui
- CREST, Japan Science and Technology Agency, Nanoarchitectonics Research Center, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 4, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8562, Japan.
| | | | | | | | | | | | | | | |
Collapse
|
61
|
Pal S, Vishal G, Gandhi KS, Ayappa KG. Ion exchange in reverse micelles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:767-778. [PMID: 15641853 DOI: 10.1021/la048771u] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The distribution and dynamics of alkali cations inside Na-AOT reverse micelles have been investigated using Monte Carlo and molecular dynamics simulations. Water is modeled using the extended simple point charge (SPC/E) model. Simulations were carried out for alkali salts of Li+, Na+, K+, and Cs+ placed into the aqueous core of the reverse micelle, for situations corresponding to one and three molecules of added salt. In all cases, we observe that the larger K+ and Cs+ ions exchange with the Na+ counterion; however, the smaller Li+ ion prefers to remains solvated within the core of the reverse micelle. Our study reveals that the oil-water interface of the Na-AOT reverse micelle has the greatest selectivity toward Cs+ followed by K+ and Li+. A model based on enthalpic contributions illustrates that the solvation energies of the different cations in water control the ion-exchange process. The hydration number of the first water shell for Li+ situated in the aqueous core of the reverse micelle with radius R = 14.1 A was similar to that observed at infinite dilution in bulk water.
Collapse
Affiliation(s)
- Sandeep Pal
- Department of Chemical Engineering, Indian Institute of Science, Bangalore 560012, India
| | | | | | | |
Collapse
|
62
|
IWAMI Y, YAMAMOTO M, NISHI N, KAKIUCHI T. Fluorescence Lifetime Measurements of Coumarin 343 for Sub-ps Solvation Dynamics in W|Aerosol-OT|1,2-Dichloroethane Reverse Micelle Systems. BUNSEKI KAGAKU 2005. [DOI: 10.2116/bunsekikagaku.54.485] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Yasunobu IWAMI
- Department of Energy and Hydrocarbon Chemistry, Kyoto University
| | | | - Naoya NISHI
- Department of Energy and Hydrocarbon Chemistry, Kyoto University
| | - Takashi KAKIUCHI
- Department of Energy and Hydrocarbon Chemistry, Kyoto University
| |
Collapse
|
63
|
Fusek F, Grančičová O, Lath D. Aquation of α-cis-[CoCl 2(edda)] - and of β-cis-[CoCl 2(trien)] + in cationic and anionic reverse micelles. JOURNAL OF CHEMICAL RESEARCH 2005. [DOI: 10.3184/0308234053431068] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The aquation of α-cis-[CoCl2(edda)]- and of β-cis-[CoCl2(trien)]+ has been studied in reverse micelles of water/AOT/n-heptane and water/CTAB/n-heptane+CHCl3 for various concentrations of water and AOT at 298.1 K. The reaction rate depends on the molar ratio W as well as on the concentration of AOT. These results demonstrate the important effect of micelle size as well as of structure and state of confined water in the aquation rate.
Collapse
Affiliation(s)
- Frederik Fusek
- Department of Physical and Theoretical Chemistry, Faculty of Natural Science, Comenius University, Mlynská dolina, 842 15 Bratislava, Slovakia
| | - Ol'ga Grančičová
- Department of Physical and Theoretical Chemistry, Faculty of Natural Science, Comenius University, Mlynská dolina, 842 15 Bratislava, Slovakia
| | - Dieter Lath
- Polymer Institute, Slovak Academy of Sciences, Dúbravská cesta 9, 842 36 Bratislava, Slovakia
| |
Collapse
|
64
|
Pant D, Girault HH. Time-resolved total internal reflection fluorescence spectroscopy : Part I. Photophysics of Coumarin 343 at liquid/liquid interface. Phys Chem Chem Phys 2005; 7:3457-63. [PMID: 16273146 DOI: 10.1039/b507830j] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Pico-second time-resolved time-correlated single photon counting (TCSPC) technique under the total internal reflection (TIR) condition has been used to study the photophysical properties of Coumarin 343 (C343) dye molecules adsorbed at the water/1,2-dichloroethane (DCE) interface. The fluorescence decay profile of C343 under TIR condition at the water/DCE interface was non-exponential and fitted to the double exponential decay function with the fluorescence lifetimes 0.3 and 3.6 ns, which proved the existence of two different forms of C343 species having largely different lifetimes at the interface. The longer fluorescence lifetime component of C343 at the interface is attributed to the emission from the monomeric form of the dye molecules and the shorter lifetime component is due to the aggregation of dye molecules. The penetration depth dependence of decay curves indicated no change in the fluorescence lifetime components, however, the amplitude corresponding to the lifetime of aggregate increased and the amplitude corresponding to the lifetime of monomer decreased with the decrease in penetration depth of the aqueous phase from the interface. Aggregation is significant in the interfacial layer. The decrease in monomer lifetime at the interface compared to that in the bulk solution is interpreted in terms of excitation energy migration between the dye molecules.
Collapse
Affiliation(s)
- Debi Pant
- Laboratoire d'Electrochimie, Ecole Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland
| | | |
Collapse
|
65
|
Sando GM, Dahl K, Owrutsky JC. Vibrational Relaxation Dynamics of Azide in Ionic and Nonionic Reverse Micelles. J Phys Chem A 2004. [DOI: 10.1021/jp0463363] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Gerald M. Sando
- Code 6111, U.S. Naval Research Laboratory, Washington, D.C. 20375-5342
| | - Kevin Dahl
- Code 6111, U.S. Naval Research Laboratory, Washington, D.C. 20375-5342
| | | |
Collapse
|
66
|
Li I, Bandara J, Shultz MJ. Time evolution studies of the H2O/quartz interface using sum frequency generation, atomic force microscopy, and molecular dynamics. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2004; 20:10474-10480. [PMID: 15544375 DOI: 10.1021/la048639u] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Many interfacial studies on solid surfaces, for example, quartz/water, assume that a standard cleaning procedure regenerates the surface reproducibly. In the reported work, the results of two surface specific techniques, sum frequency generation (SFG) spectroscopy and atomic force microscopy, show that the effects of prolonged exposure to Nanopure water and to pH 10 NaOH are distinctly different. In conjunction with the experimental data, molecular mechanics is used to correlate the SFG spectral frequencies to the hydrogen stretching vibrations of the surface-bound water molecules. It is found that after 17 days of soaking in water, water molecules penetrate into the SiO2 matrix to produce a swollen and amorphous layer; it is likely that broken Si-O bonds from the polishing process serve as nucleation sites for hydration and swelling. Disorder introduced in the interfacial water layer is detected by the rising intensity of the weakly hydrogen-bonded SFG peak at 3450 cm(-1). Dominance of the 3450 cm(-1) is absent in a pH 10, NaOH-soaked quartz disk, indicating that the strong hydrogen-bonded network in water remains intact.
Collapse
Affiliation(s)
- Irene Li
- Department of Chemistry, Tufts University, 62 Talbot Avenue, Medford, Massachusetts 02155, USA
| | | | | |
Collapse
|
67
|
Li S, Shepherd TD, Thompson WH. Simulations of the Vibrational Relaxation of a Model Diatomic Molecule in a Nanoconfined Polar Solvent. J Phys Chem A 2004. [DOI: 10.1021/jp048361e] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Shenmin Li
- Department of Chemistry, University of Kansas, Lawrence, Kansas 66045-7582, and Department of Chemistry/Physics, Westminster College, Salt Lake City, Utah 84105
| | - Tricia D. Shepherd
- Department of Chemistry, University of Kansas, Lawrence, Kansas 66045-7582, and Department of Chemistry/Physics, Westminster College, Salt Lake City, Utah 84105
| | - Ward H. Thompson
- Department of Chemistry, University of Kansas, Lawrence, Kansas 66045-7582, and Department of Chemistry/Physics, Westminster College, Salt Lake City, Utah 84105
| |
Collapse
|
68
|
Senapati S, Berkowitz ML. Computer Simulation Studies of Water States in Perfluoro Polyether Reverse Micelles: Effects of Changing the Counterion. J Phys Chem A 2004. [DOI: 10.1021/jp048954p] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sanjib Senapati
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
| | - Max L. Berkowitz
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
| |
Collapse
|
69
|
Hirose Y, Yui H, Sawada T. The Ultrafast Relaxation Dynamics of a Viscosity Probe Molecule in an AOT-Reversed Micelle: Contribution of the Specific Interactions with the Local Environment. J Phys Chem B 2004. [DOI: 10.1021/jp0370775] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Yasushi Hirose
- Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan, and Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency (JST), 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan
| | - Hiroharu Yui
- Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan, and Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency (JST), 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan
| | - Tsuguo Sawada
- Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan, and Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency (JST), 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan
| |
Collapse
|
70
|
Thompson WH. Simulations of time-dependent fluorescence in nano-confined solvents. J Chem Phys 2004; 120:8125-33. [PMID: 15267732 DOI: 10.1063/1.1691391] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The time-dependent fluorescence of a model diatomic molecule with a charge-transfer electronic transition in confined solvents has been simulated. The effect of confining the solvent is examined by comparing results for solutions contained within hydrophobic spherical cavities of varying size (radii of 10-20 angstroms). In previous work [J. Chem. Phys. 118, 6618 (2002)] it was found that the solute position in the cavity critically affects the absorption and fluorescence spectra and their dependence on cavity size. Here we examine the effect of cavity size on the time-dependent fluorescence, a common experimental probe of solvent dynamics. The present results confirm a prediction that motion of the solute in the cavity after excitation can be important in the time-dependent fluorescence. The effects of solvent density are also considered. The results are discussed in the context of interpreting time-dependent fluorescence measurements of confined solvent systems.
Collapse
Affiliation(s)
- Ward H Thompson
- Department of Chemistry, University of Kansas, Lawrence, Kansas 66045, USA
| |
Collapse
|
71
|
Shirota H, Tamoto Y, Segawa H. Dynamic Fluorescence Probing of the Microenvironment of Sodium Dodecyl Sulfate Micelle Solutions: Surfactant Concentration Dependence and Solvent Isotope Effect. J Phys Chem A 2004. [DOI: 10.1021/jp035861j] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hideaki Shirota
- Department of General Systems Sciences, Graduate School of Arts & Sciences, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan, and Department of Applied Chemistry, Graduate School of Engineering, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
| | - Yushi Tamoto
- Department of General Systems Sciences, Graduate School of Arts & Sciences, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan, and Department of Applied Chemistry, Graduate School of Engineering, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
| | - Hiroshi Segawa
- Department of General Systems Sciences, Graduate School of Arts & Sciences, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan, and Department of Applied Chemistry, Graduate School of Engineering, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
| |
Collapse
|
72
|
Shirota H, Segawa H. Solvation dynamics of formamide and N,N-dimethylformamide in aerosol OT reverse micelles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2004; 20:329-335. [PMID: 15743074 DOI: 10.1021/la030161r] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The solvation dynamics of formamide and N,N-dimethylformamide in Aerosol OT reverse micelles has been investigated in this work. The solvation dynamics of formamide and N,N-dimethylformamide in the reverse micelles is more than 100 times slower than that of the pure solvents. The solvation dynamics of formamide in the reverse micelle solution depends strongly on the molar ratio between formamide and Aerosol OT (w = [polar solvent]/[Aerosol OT]), but that of N,N-dimethylformamide in the reverse micelle solution shows a tiny w dependence. We have estimated the interaction energies of the geometry-optimized clusters of a simple model of the Aerosol OT polar headgroup (CH3SO3-) and formamide or N,N-dimethylformamide by ab initio calculations (the second-order Møller-Plesset perturbation theory) to find their interactions. The interaction energies of the mimic clusters estimated by the ab initio calculations and the features of the slow solvation dynamics and w dependence in formamide and N,N-dimethylformamide reverse micelles are discussed.
Collapse
Affiliation(s)
- Hideaki Shirota
- Department of General Systems Sciences, Graduate School of Arts and Sciences, University of Tokyo, Meguro-ku, Tokyo 153-8902, Japan.
| | | |
Collapse
|
73
|
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.
Collapse
Affiliation(s)
- Michael R Harpham
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523-1872, USA
| | | | | | | |
Collapse
|
74
|
Kitano H, Imai M, Gemmei-Ide M, Takaha K. Raman spectroscopic study on the structure of water in aqueous solution of zwitterionic surfactants. J Colloid Interface Sci 2004; 269:459-65. [PMID: 14654407 DOI: 10.1016/j.jcis.2003.08.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The structure and hydrogen bonding of water in aqueous solutions of various surfactants were analyzed using the contours of the O-H stretching in the polarized Raman spectra. From the relative intensity of the collective band (C value) corresponding to a long-range coupling of the O-H stretching in the aqueous surfactant solutions, the number of hydrogen bonds disrupted due to the presence of one surfactant molecule (N(corr) value) was evaluated. The N(corr) value for decylsulfobetaine was slightly negative, whereas those for ordinary ionic surfactants such as sodium dodecylsulfate and dodecyltrimethylammonium chloride were large positive values. Furthermore, the N(corr) for carboxybetaine surfactant was a small positive value. These results suggest that zwitterionic surfactants do not disturb the hydrogen-bonded network structure of water significantly, probably due to the counteraction of the electrostriction effect by the proximity between the anionic and cationic groups.
Collapse
Affiliation(s)
- Hiromi Kitano
- Department of Chemical and Biochemical Engineering, Toyama University, 930-8555, Toyama, Japan.
| | | | | | | |
Collapse
|
75
|
García-Río L, Hervés P, Mejuto JC, Pérez-Juste J, Rodríguez-Dafonte P. Pseudophase Approach to Reactivity in Microemulsions: Quantitative Explanation of the Kinetics of the Nitroso Group Transfer Reactions between N-methyl-N-nitroso-p- toluenesulfonamide and Secondary Alkylamines in Water/AOT/Isooctane Microemulsions. Ind Eng Chem Res 2003. [DOI: 10.1021/ie0208523] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- L. García-Río
- Facultad de Química, Departamento de Química Física, Universidad de Santiago de Compostela, Santiago de Compostela, Spain, and Facultad de Ciencias, Departamento de Química Física, Campus de As Lagoas, Universidad de Vigo, Ourense, Spain
| | - P. Hervés
- Facultad de Química, Departamento de Química Física, Universidad de Santiago de Compostela, Santiago de Compostela, Spain, and Facultad de Ciencias, Departamento de Química Física, Campus de As Lagoas, Universidad de Vigo, Ourense, Spain
| | - J. C. Mejuto
- Facultad de Química, Departamento de Química Física, Universidad de Santiago de Compostela, Santiago de Compostela, Spain, and Facultad de Ciencias, Departamento de Química Física, Campus de As Lagoas, Universidad de Vigo, Ourense, Spain
| | - J. Pérez-Juste
- Facultad de Química, Departamento de Química Física, Universidad de Santiago de Compostela, Santiago de Compostela, Spain, and Facultad de Ciencias, Departamento de Química Física, Campus de As Lagoas, Universidad de Vigo, Ourense, Spain
| | - P. Rodríguez-Dafonte
- Facultad de Química, Departamento de Química Física, Universidad de Santiago de Compostela, Santiago de Compostela, Spain, and Facultad de Ciencias, Departamento de Química Física, Campus de As Lagoas, Universidad de Vigo, Ourense, Spain
| |
Collapse
|
76
|
Shirota H, Segawa H. Time-Resolved Fluorescence Study on Liquid Oligo(ethylene oxide)s: Coumarin 153 in Poly(ethylene glycol)s and Crown Ethers. J Phys Chem A 2003. [DOI: 10.1021/jp022514l] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hideaki Shirota
- Department of General Systems Sciences, Graduate School of Arts and Sciences, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
| | - Hiroshi Segawa
- Department of General Systems Sciences, Graduate School of Arts and Sciences, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
| |
Collapse
|
77
|
Baumann R, Ferrante C, Kneuper E, Deeg FW, Bräuchle C. Influence of Confinement on the Solvation and Rotational Dynamics of Coumarin 153 in Ethanol. J Phys Chem A 2003. [DOI: 10.1021/jp027172y] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Robert Baumann
- Department Chemie, Bereich Physikalische Chemie, Ludwig-Maximilians- Universität, Butenandtstrasse 5-13, D-81377 München, Germany
| | - Camilla Ferrante
- Department Chemie, Bereich Physikalische Chemie, Ludwig-Maximilians- Universität, Butenandtstrasse 5-13, D-81377 München, Germany
| | - Erwin Kneuper
- Department Chemie, Bereich Physikalische Chemie, Ludwig-Maximilians- Universität, Butenandtstrasse 5-13, D-81377 München, Germany
| | - Fred-Walter Deeg
- Department Chemie, Bereich Physikalische Chemie, Ludwig-Maximilians- Universität, Butenandtstrasse 5-13, D-81377 München, Germany
| | - Christoph Bräuchle
- Department Chemie, Bereich Physikalische Chemie, Ludwig-Maximilians- Universität, Butenandtstrasse 5-13, D-81377 München, Germany
| |
Collapse
|
78
|
Senapati S, Berkowitz ML. Water structure and dynamics in phosphate fluorosurfactant based reverse micelle: A computer simulation study. J Chem Phys 2003. [DOI: 10.1063/1.1531585] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
79
|
Cave RJ, Castner EW. Time-Dependent Density Functional Theory Investigation of the Ground and Excited States of Coumarins 102, 152, 153, and 343. J Phys Chem A 2002. [DOI: 10.1021/jp026718d] [Citation(s) in RCA: 140] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Robert J. Cave
- Department of Chemistry, Harvey Mudd College, Claremont, California 91711
| | - Edward W. Castner
- Department of Chemistry and Chemical Biology, Rutgers University, 610 Taylor Road, Piscataway, New Jersey 08854-8087
| |
Collapse
|
80
|
|
81
|
Boyd JE, Briskman A, Sayes CM, Mittleman D, Colvin V. Terahertz Vibrational Modes of Inverse Micelles. J Phys Chem B 2002. [DOI: 10.1021/jp0255740] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Joel E. Boyd
- Department of Chemistry, and Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77251
| | - Ari Briskman
- Department of Chemistry, and Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77251
| | - Christie M. Sayes
- Department of Chemistry, and Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77251
| | - Daniel Mittleman
- Department of Chemistry, and Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77251
| | - Vicki Colvin
- Department of Chemistry, and Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77251
| |
Collapse
|
82
|
Seifert G, Patzlaff T, Graener H. Size dependent ultrafast cooling of water droplets in microemulsions by picosecond infrared spectroscopy. PHYSICAL REVIEW LETTERS 2002; 88:147402. [PMID: 11955174 DOI: 10.1103/physrevlett.88.147402] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2001] [Indexed: 05/23/2023]
Abstract
The ultrafast thermal relaxation of reversed micelles in n-octane/AOT/water (where AOT denotes sodium di-2-ethylhexyl sulfosuccinate) microemulsions was investigated by time-resolved infrared pump-probe spectroscopy. This picosecond cooling process can be described in terms of heat diffusion, demonstrating a new method to determine the nanometer radii of the water droplets. The reverse micelles are stable against transient temperatures far above the equilibrium stability range. The amphiphilic interface layer (AOT) seems to provide an efficient heat contact between the water and the nonpolar solvent.
Collapse
Affiliation(s)
- G Seifert
- Martin-Luther-Universität Halle-Wittenberg, Fachbereich Physik, Hoher Weg 8, D-06099 Halle, Germany
| | | | | |
Collapse
|
83
|
Rack JJ, McCleskey TM, Birnbaum ER. Perturbing the Sequestered Water-Pool in Microemulsions: The Role of the Probe in Affecting Reverse Micelle Equilibria. J Phys Chem B 2001. [DOI: 10.1021/jp012472l] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jeffrey J. Rack
- Chemistry Division, MS J514, Los Alamos National Laboratories, Los Alamos, New Mexico 87545
| | - T. Mark McCleskey
- Chemistry Division, MS J514, Los Alamos National Laboratories, Los Alamos, New Mexico 87545
| | - Eva R. Birnbaum
- Chemistry Division, MS J514, Los Alamos National Laboratories, Los Alamos, New Mexico 87545
| |
Collapse
|
84
|
Benderskii AV, Eisenthal KB. Dynamical Time Scales of Aqueous Solvation at Negatively Charged Lipid/Water Interfaces. J Phys Chem A 2001. [DOI: 10.1021/jp0120155] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
85
|
Faeder J, Ladanyi BM. Solvation Dynamics in Aqueous Reverse Micelles: A Computer Simulation Study. J Phys Chem B 2001. [DOI: 10.1021/jp010632n] [Citation(s) in RCA: 150] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- James Faeder
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523
| | - Branka M. Ladanyi
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523
| |
Collapse
|
86
|
Squitieri E, Benjamin I. Organic Monolayers as Mimics of Liquid/Liquid Interfaces: Molecular Dynamics Study of Electronic Spectra and Solvent Dynamics. J Phys Chem B 2001. [DOI: 10.1021/jp0101716] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Emilio Squitieri
- Escuela de Quimica, Facultad de Ciencias, University Central de Venezuela, Caracas, Venezuela
| | - Ilan Benjamin
- Department of Chemistry, University of California, Santa Cruz, California 95064
| |
Collapse
|
87
|
Michael D, Benjamin I. Molecular dynamics computer simulations of solvation dynamics at liquid/liquid interfaces. J Chem Phys 2001. [DOI: 10.1063/1.1334902] [Citation(s) in RCA: 96] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
88
|
Lock AJ, Woutersen S, Bakker HJ. Ultrafast Energy Equilibration in Hydrogen-Bonded Liquids. J Phys Chem A 2001. [DOI: 10.1021/jp003158e] [Citation(s) in RCA: 165] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- A. J. Lock
- FOM Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands
| | - S. Woutersen
- FOM Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands
| | - H. J. Bakker
- FOM Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands
| |
Collapse
|
89
|
Benderskii AV, Eisenthal KB. Effect of Organic Surfactant on Femtosecond Solvation Dynamics at the Air-Water Interface. J Phys Chem B 2000. [DOI: 10.1021/jp0025429] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
90
|
Willard DM, Levinger NE. Influence of Morphology on Polar Solvation Dynamics in Lecithin Reverse Micelles. J Phys Chem B 2000. [DOI: 10.1021/jp002076n] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- 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
| |
Collapse
|
91
|
Kloepfer JA, Vilchiz VH, Lenchenkov VA, Germaine AC, Bradforth SE. The ejection distribution of solvated electrons generated by the one-photon photodetachment of aqueous I− and two-photon ionization of the solvent. J Chem Phys 2000. [DOI: 10.1063/1.1309011] [Citation(s) in RCA: 161] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
92
|
|
93
|
Faeder J, Ladanyi BM. Molecular Dynamics Simulations of the Interior of Aqueous Reverse Micelles. J Phys Chem B 2000. [DOI: 10.1021/jp993076u] [Citation(s) in RCA: 382] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- J. Faeder
- Department of Chemistry, Colorado State University, Ft. Collins, Colorado 80523
| | - B. M. Ladanyi
- Department of Chemistry, Colorado State University, Ft. Collins, Colorado 80523
| |
Collapse
|
94
|
Pant D, Levinger NE. Polar Solvation Dynamics of H2O and D2O at the Surface of Zirconia Nanoparticles. J Phys Chem B 1999. [DOI: 10.1021/jp991746q] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Debi Pant
- 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
| |
Collapse
|