1
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Mondal J, Maji D, Mitra S, Biswas R. Temperature-Dependent Dielectric Relaxation Measurements of (Betaine + Urea + Water) Deep Eutectic Solvent in Hz-GHz Frequency Window: Microscopic Insights into Constituent Contributions and Relaxation Mechanisms. J Phys Chem B 2024. [PMID: 38949428 DOI: 10.1021/acs.jpcb.4c02784] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/02/2024]
Abstract
A combined experimental and simulation study of dielectric relaxation (DR) of a deep eutectic solvent (DES) composed of betaine, urea, and water with the composition [Betaine:Urea:Water = 11.7:12:1 (weight ratio) and 9:18:5 (molar ratio)] was performed to explore and understand the interaction and dynamics of this system. Temperature-dependent (303 ≤ T/K ≤ 343) measurements were performed over 9 decades of frequency, combining three different measurement setups. Measured DR, comprising four distinct steps with relaxation times spreading over a few picoseconds to several nanoseconds, was found to agree well with simulations. The simulated total DR spectra, upon dissection into three self (intraspecies) and three cross (interspecies) interaction contributions, revealed that the betaine-betaine self-term dominated (∼65%) the relaxation, while the urea-urea and water-water interactions contributed only ∼7% and ∼1%, respectively. The cross-terms (betaine-urea, betaine-water, and urea-water) together accounted for <30% of the total DR. The slowest DR component with a time constant of ∼1-10 ns derived dominant contribution from betaine-betaine interactions, where betaine-water and urea-water interactions also contributed. The subnanosecond (0.1-0.6 ns) time scale originated from all interactions except betaine-water interaction. An extensive interaction of water with betaine and urea severely reduced the average number of water-water H-bonds (∼0.7) and heavily decreased the static dielectric constant of water in this DES (εs ∼ 2). Furthermore, simulated first rank collective single particle reorientational relaxations (C1(t)) and the structural H-bond fluctuation dynamics (CHB (t)) exhibited multiexponential kinetics with time scales that corresponded well with those found both in the simulated and measured DR.
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Affiliation(s)
- Jayanta Mondal
- Department of Chemical and Biological Sciences, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700106, India
| | - Dhrubajyoti Maji
- Department of Chemical and Biological Sciences, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700106, India
| | - Sudipta Mitra
- Department of Chemical and Biological Sciences, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700106, India
| | - Ranjit Biswas
- Department of Chemical and Biological Sciences, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700106, India
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2
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Dynamics of a PEG based polymer gel Electrolyte: A combined frequency dependent dielectric relaxation and Time-resolved fluorescence spectroscopic study. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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3
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Dinda S, Sil A, Das A, Tarif E, Biswas R. Does urea modify microheterogeneous nature of ionic amide deep eutectics? Clues from non-reactive and reactive solute-centered dynamics. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.118126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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4
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Kumbhakar K, Dey A, Mondal A, De P, Biswas R. Interactions and Dynamics in Aqueous Solutions of pH-Responsive Polymers: A Combined Fluorescence and Dielectric Relaxation Study. J Phys Chem B 2021; 125:6023-6035. [PMID: 34057364 DOI: 10.1021/acs.jpcb.1c03435] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Interaction and dynamics of aqueous solutions of pH-responsive smart polymers are investigated via steady-state, time-resolved fluorescence emission spectroscopy with the help of external local reporter coumarin 153 (C153), while MHz to GHz dielectric relaxation spectroscopic (DRS) measurement reports the intrinsic medium relaxation features. A series of pH-responsive random copolymers (DPL-DP60) comprising of a pH-responsive moiety 2-((leucinyl)oxy)ethyl methacrylate (l-Leu-HEMA) and hydrophobic methyl methacrylate (MMA) are synthesized and characterized. A balance between the pH-responsive (l-Leu-HEMA) and the hydrophobic (MMA) content dictates the phase transition pH, which is found to be ∼5-7 for these aqueous copolymer solutions (1 mg/mL). Dynamic light scattering measurements in aqueous solutions of these polymers reflect a small particle size (∼2-8 nm) at solution pH below their individual phase transition pH, while a large particle size (∼140-340 nm) forms beyond their phase transition pH. No signature of a phase transition pH-driven abrupt change in static and dynamic properties of aqueous polymer solutions has been registered from pH-dependent dielectric relaxation as well as solute (C153)-centric fluorescence measurements. A significant impact of varying the l-Leu-HEMA/MMA segment ratio on steady-state fluorescence emission and rotational anisotropy decay of the fluorophore solute (C153) has been observed. MHz to GHz DRS in aqueous solutions of these pH-responsive polymers reflects bulk water-like dielectric features.
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Affiliation(s)
- Kajal Kumbhakar
- Chemical, Biological and Macromolecular Sciences (CBMS), S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700106, India
| | - Asmita Dey
- Polymer Research Centre and Centre for Advanced Functional Materials, Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, 741246 Nadia, West Bengal, India
| | - Amrita Mondal
- Chemical, Biological and Macromolecular Sciences (CBMS), S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700106, India
| | - Priyadarsi De
- Polymer Research Centre and Centre for Advanced Functional Materials, Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, 741246 Nadia, West Bengal, India
| | - Ranjit Biswas
- Chemical, Biological and Macromolecular Sciences (CBMS), S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700106, India
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Baksi A, Rajbangshi J, Biswas R. Water in biodegradable glucose–water–urea deep eutectic solvent: modifications of structure and dynamics in a crowded environment. Phys Chem Chem Phys 2021; 23:12191-12203. [DOI: 10.1039/d1cp00734c] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Molecular dynamics simulations have been performed on a highly viscous (η ∼ 255 cP) naturally abundant deep eutectic solvent (NADES) composed of glucose, urea and water in a weight ratio of 6 : 4 : 1 at 328 K.
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Affiliation(s)
- Atanu Baksi
- Department of Chemical, Biological and Macromolecular Sciences
- S. N. Bose National Centre for Basic Sciences
- Kolkata 700106
- India
| | - Juriti Rajbangshi
- Department of Chemical, Biological and Macromolecular Sciences
- S. N. Bose National Centre for Basic Sciences
- Kolkata 700106
- India
| | - Ranjit Biswas
- Department of Chemical, Biological and Macromolecular Sciences
- S. N. Bose National Centre for Basic Sciences
- Kolkata 700106
- India
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6
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Tarif E, Mondal J, Biswas R. How frictional response during solute solvation controls solute rotation in naturally abundant deep eutectic solvent (NADES)? A case study with amino acid derivative containing DES. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.112451] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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7
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Kumbhakar K, Saha B, De P, Biswas R. Cloud Point Driven Dynamics in Aqueous Solutions of Thermoresponsive Copolymers: Are They Akin to Criticality Driven Solution Dynamics? J Phys Chem B 2019; 123:11042-11054. [PMID: 31794221 DOI: 10.1021/acs.jpcb.9b07840] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Cloud point driven interaction and relaxation dynamics of aqueous solutions of amphiphilic thermoresponsive copolymers were explored through picosecond resolved and steady state fluorescence measurements employing hydrophilic (coumarin 343, C343) and hydrophobic (coumarin 153, C153) solute probes of comparable sizes. These thermoresponsive random copolymers, with tunable cloud point temperatures (Tcp's) between 298 and 323 K, were rationally designed first and then synthesized via reversible addition-fragmentation chain transfer (RAFT) copolymerization of methyl methacrylate (MMA) and poly(ethylene glycol) monomethyl ether methacrylate (PEGMA). Subsequently, copolymers were characterized by NMR spectroscopy and size exclusion chromatography (SEC). A balance between the hydrophilic (PEGMA) and the hydrophobic (MMA) content dictates the critical aggregation concentration (CAC), with CAC ∼ 2-14 mg/L for these copolymers in aqueous media. No abrupt changes in the steady state spectral features of both C153 and C343 in the aqueous solutions of these polymers near but below the cloud point temperatures were observed. Interestingly, spectral properties of C153 in these solutions show the impact of hydrophobic/hydrophilic interaction balance but not by those of C343. More specifically, C153 reported a blue shift (relative to that in neat water) and heterogeneity in its local environment. This suggested different locations for the hydrophilic (C343) and the hydrophobic (C153) probes. In addition, the excited state fluorescence lifetime (⟨τlife⟩) of C153 increased with the increase of hydrophobic (MMA) content in these copolymers. However, C343 reported no such variations, although fluorescence anisotropy decays for both solutes were significantly slowed down in these aqueous solutions compared to neat water. Anisotropy decays indicated bimodal time-dependent friction for these solutes in aqueous solutions of these copolymers but monomodal in neat water. A linear dependence of the average rotational relaxation rates (⟨krot⟩ = ⟨τrot⟩-1) of the type ⟨krot⟩ ∝ (|T - Tcp|/Tcp)γ with negative values for the exponent γ was observed for both solutes. No slowing down of the solute rotation with temperature approaching the Tcp was detected; rather, rotation became faster upon increasing the solution temperature, suggesting domination of the local friction.
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Affiliation(s)
- Kajal Kumbhakar
- Chemical, Biological and Macromolecular Sciences (CBMS) , S. N. Bose National Centre for Basic Sciences , JD Block, Sector III, Salt Lake, Kolkata 700106 , India
| | - Biswajit Saha
- Polymer Research Centre and Centre for Advanced Functional Materials, Department of Chemical Sciences , Indian Institute of Science Education and Research Kolkata , Mohanpur 741246 , Nadia, West Bengal , India
| | - Priyadarsi De
- Polymer Research Centre and Centre for Advanced Functional Materials, Department of Chemical Sciences , Indian Institute of Science Education and Research Kolkata , Mohanpur 741246 , Nadia, West Bengal , India
| | - Ranjit Biswas
- Chemical, Biological and Macromolecular Sciences (CBMS) , S. N. Bose National Centre for Basic Sciences , JD Block, Sector III, Salt Lake, Kolkata 700106 , India
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8
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Tarif E, Mondal J, Biswas R. Interaction and Dynamics in a Fully Biodegradable Glucose-Containing Naturally Abundant Deep Eutectic Solvent: Temperature-Dependent Time-Resolved Fluorescence Measurements. J Phys Chem B 2019; 123:9378-9387. [PMID: 31599593 DOI: 10.1021/acs.jpcb.9b06783] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A new room-temperature deep eutectic solvent (DES) composed of glucose, urea, and water has been prepared and its relaxation dynamics explored via temperature-dependent time-resolved fluorescence measurements employing hydrophilic and hydrophobic solute probes. Differential scanning calorimetry measurements indicate a glass transition temperature (Tg) of ∼236 K. Measured viscosity coefficients (η) vary from ∼600 to ∼100 cP in the temperature range 318 ≤ T/K ≤ 343 and exhibit Arrhenius-type temperature dependence with an activation energy of ∼65 kJ mol-1. Interestingly, this DES forms a stable liquid at ∼300 K but is too viscous to be accurately measured by us below 318 K. Temperature-dependent dynamic fluorescence anisotropy measurements using hydrophobic and hydrophilic solutes of similar sizes reveal bi-exponential kinetics and Arrhenius-type temperature dependence for solute rotation times (⟨τr⟩) but with significantly decreased activation energies, ∼31 kJ mol-1 (hydrophobic) and ∼21 kJ mol-1 (hydrophilic). Deviation from hydrodynamics is further reflected in the strong fractional viscosity dependence of ⟨τr⟩: ⟨τr⟩ ∝ (η/T)p with p ≈ 0.3-0.5, indicating pronounced temporal heterogeneity in the relaxation dynamics. Dynamic fluorescence Stokes shift measurements (temporal resolution ∼85 ps) produce dynamic shifts of ∼500-700 cm-1, bi-exponential solvation energy relaxation with time constants in the range ∼0.2 ns and ∼4 ns, and estimated missing amplitudes of ∼65-75%. Impact of the density difference between a nonpolar solvent and this DES on the estimated missing amplitudes is explored via measuring the temperature-dependent densities and refractive indices of this DES. Lifetime measurements suggest considerable temperature dependence for the hydrophobic solute but no such dependence for the hydrophilic one. Excitation energy dependence of fluorescence emission of various solutes with widely different lifetimes indicates mild spatial heterogeneity for this DES.
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Affiliation(s)
- Ejaj Tarif
- Chemical, Biological and Macromolecular Sciences (CBMS) , S. N. Bose National Centre for Basic Sciences , JD Block, Sector III, Salt Lake , Kolkata 700106 , India
| | - Jayanta Mondal
- Chemical, Biological and Macromolecular Sciences (CBMS) , S. N. Bose National Centre for Basic Sciences , JD Block, Sector III, Salt Lake , Kolkata 700106 , India
| | - Ranjit Biswas
- Chemical, Biological and Macromolecular Sciences (CBMS) , S. N. Bose National Centre for Basic Sciences , JD Block, Sector III, Salt Lake , Kolkata 700106 , India
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9
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Solvent dependent relaxation dynamics in lithium ion battery electrolytes: Coupling to medium friction. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.111225] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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10
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Fujii K, Aramaki M, Kimura Y. Excited-State Proton Transfer of 5,8-Dicyano-2-naphthol in High-Temperature and High-Pressure Methanol: Effect of Solvent Polarity and Hydrogen Bonding Ability. J Phys Chem B 2018; 122:12363-12374. [DOI: 10.1021/acs.jpcb.8b09235] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kaori Fujii
- Department of Applied Chemistry, Graduate School of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - Megumi Aramaki
- Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - Yoshifumi Kimura
- Department of Applied Chemistry, Graduate School of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
- Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
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11
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Ha MY, Yoon TJ, Tlusty T, Jho Y, Lee WB. Widom Delta of Supercritical Gas-Liquid Coexistence. J Phys Chem Lett 2018; 9:1734-1738. [PMID: 29553732 DOI: 10.1021/acs.jpclett.8b00430] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Density fluctuations and the Widom line are of great importance in understanding the critical phenomena and the behaviors of supercritical fluids (SCFs). We report on the direct classification of liquid-like and gas-like molecules coexisting in the SCF, identified by machine learning analysis on simulation data. The deltoid coexistence region encloses the Widom line and may therefore be termed the Widom delta. Number fractions of gas-like and liquid-like particles are found to undergo continuous transition across the delta, following a simplified two-state model. These fractions are closely related to the magnitude of supercritical anomaly, which originates from the fluctuation between the two types. This suggests a microscopic view of the SCF as a mixture of liquid-like and gas-like structures, providing an integrative explanation to the anomalous behaviors near the critical point and the Widom line.
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Affiliation(s)
- Min Young Ha
- School of Chemical and Biological Engineering, Institute of Chemical Processes , Seoul National University , Seoul 08826 , Republic of Korea
| | - Tae Jun Yoon
- School of Chemical and Biological Engineering, Institute of Chemical Processes , Seoul National University , Seoul 08826 , Republic of Korea
| | - Tsvi Tlusty
- Center for Soft and Living Matter , Institute for Basic Science (IBS) , Ulsan 44919 , Korea
- Department of Physics , Ulsan National Institute of Science and Technology (UNIST) , Ulsan 44919 , Korea
| | - Yongseok Jho
- Department of Physics and Research Institute of Natural Science , Gyeongsang National University , Jinju 52828 , Republic of Korea
| | - Won Bo Lee
- School of Chemical and Biological Engineering, Institute of Chemical Processes , Seoul National University , Seoul 08826 , Republic of Korea
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12
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Ingrosso F, Ruiz-López MF. Modeling Solvation in Supercritical CO 2. Chemphyschem 2017; 18:2560-2572. [PMID: 28719104 DOI: 10.1002/cphc.201700434] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2017] [Indexed: 11/10/2022]
Abstract
In recent decades, a microscopic understanding of solute-solvent intermolecular interactions has been key to advances in technologies based on supercritical carbon dioxide. In many cases, computational work has provided the impetus for new discoveries, shedding new light on important concepts such as the local structure around the solute in the supercritical medium, the influence of the peculiar properties of the latter on the molecular behavior of dissolved substances and, importantly, CO2 -philicity. In this Review, the theoretical work that has been relevant to these developments is surveyed and, by presenting some crucial open questions, the possible routes to achieving further progress based on the interplay between theory and experiments is discussed.
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Affiliation(s)
- Francesca Ingrosso
- SRSMC UMR 7565, Université de Lorraine, BP 70239, 54506, Vandoeuvre-lès-Nancy, France.,SRSMC UMR 7565, CNRS, BP 70239, 54506, Vandoeuvre-lès-Nancy, France
| | - Manuel F Ruiz-López
- SRSMC UMR 7565, Université de Lorraine, BP 70239, 54506, Vandoeuvre-lès-Nancy, France.,SRSMC UMR 7565, CNRS, BP 70239, 54506, Vandoeuvre-lès-Nancy, France
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13
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Indra S, Biswas R. How Heterogeneous Are Trehalose/Glycerol Cryoprotectant Mixtures? A Combined Time-Resolved Fluorescence and Computer Simulation Investigation. J Phys Chem B 2016; 120:11214-11228. [PMID: 27723334 DOI: 10.1021/acs.jpcb.6b06511] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Heterogeneity and molecular motions in representative cryoprotectant mixtures made of trehalose and glycerol are investigated in the temperature range 298 ≤ T (K) ≤ 353, via time-resolved fluorescence Stokes shift and anisotropy measurements, and molecular dynamics simulations of four-point density-time correlations and H-bond relaxations. Mixtures containing 5 and 20 wt % of trehalose along with neat glycerol are studied. Viscosity coefficients for these systems lie in the range 0.30 < η (P) < 23. Measured solute (Coumarin 153) rotation and solvation times reveal a substantial departure from the hydrodynamic viscosity dependence, suggesting the strong microheterogeneous nature of these systems. Fluorescence anisotropy decays are highly nonexponential, reflecting a non-Markovian character of the medium friction. A complete missing of the Stokes shift dynamics in these systems at 298 K but partial detection of it at other higher temperatures (shift magnitude being ∼400-600 cm-1) indicates rigid solute environments. An amorphous solid-like feature emerges in the simulated radial distribution functions at these temperatures. Analyses of mean squared displacements reveal rattling-in-a-cage motion, non-Gaussian displacement distributions, and strong dynamic heterogeneity features. Simulated dynamic structure factors and four-point correlations hint, respectively, at very long α-relaxation and correlated time scales at 298 K. This explains the long solute rotation times (∼80-200 ns) measured at 298 K. Stretched exponential decay of the simulated H-bond relaxations with long time scales further highlights the strong temporal heterogeneity and slow dynamics inherent to these systems. In summary, this work provides the first insight into the molecular motions and interspecies interaction in a representative cryoprotectant mixture, and stimulates further study to investigate the interconnection between cryoprotection and dynamic heterogeneity.
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Affiliation(s)
- Sandipa Indra
- Department of Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences , Block-JD, Salt Lake, Sector-III, Kolkata 700106, India
| | - Ranjit Biswas
- Department of Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences , Block-JD, Salt Lake, Sector-III, Kolkata 700106, India
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14
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Mukherjee K, Barman A, Biswas R. Impact of the aggregation behaviour of sodium cholate and sodium deoxycholate on aqueous solution structure and dynamics: A combined time resolved fluorescence and dielectric relaxation spectroscopic study. J Mol Liq 2016. [DOI: 10.1016/j.molliq.2016.07.053] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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15
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Liu Z, Fang Z, Muroya Y, Fu H, Yan Y, Katsumura Y, Lin M. Local density augmentation of supercritical water probed by 4,4′-bpyH radical: A pulse radiolysis study. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2016.05.059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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16
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INDRA SANDIPA, BISWAS RANJIT. Are N-methyl groups of Tetramethylurea (TMU) Hydrophobic? A composition and temperature-dependent fluorescence spectroscopic investigation of TMU/water binary mixtures. J CHEM SCI 2016. [DOI: 10.1007/s12039-016-1072-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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17
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Indra S, Guchhait B, Biswas R. Structural anomaly and dynamic heterogeneity in cycloether/water binary mixtures: Signatures from composition dependent dynamic fluorescence measurements and computer simulations. J Chem Phys 2016; 144:124506. [DOI: 10.1063/1.4943967] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Sandipa Indra
- Department of Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Block-JD, Sector-III, Salt Lake, Kolkata 700098, India
| | - Biswajit Guchhait
- Department of Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Block-JD, Sector-III, Salt Lake, Kolkata 700098, India
| | - Ranjit Biswas
- Department of Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Block-JD, Sector-III, Salt Lake, Kolkata 700098, India
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18
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Indra S, Biswas R. Heterogeneity in (2-butoxyethanol + water) mixtures: Hydrophobicity-induced aggregation or criticality-driven concentration fluctuations? J Chem Phys 2015; 142:204501. [DOI: 10.1063/1.4921651] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Sandipa Indra
- Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700098, India
| | - Ranjit Biswas
- Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700098, India
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19
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Das A, Das S, Biswas R. Density relaxation and particle motion characteristics in a non-ionic deep eutectic solvent (acetamide + urea): Time-resolved fluorescence measurements and all-atom molecular dynamics simulations. J Chem Phys 2015; 142:034505. [DOI: 10.1063/1.4906119] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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20
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Guchhait B, Das S, Daschakraborty S, Biswas R. Interaction and dynamics of (alkylamide + electrolyte) deep eutectics: Dependence on alkyl chain-length, temperature, and anion identity. J Chem Phys 2014; 140:104514. [DOI: 10.1063/1.4866178] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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21
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Lee SY, Lee MH, Park Y, You SS. Modeling for Ligand-Capped Metallic Nanoparticles in a Gas-Expanded Liquids System: Surface Fraction Model. Ind Eng Chem Res 2013. [DOI: 10.1021/ie300816t] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Seong Yun Lee
- Department of Applied Chemical
Engineering, Korea University of Technology and Education, 307 Gajeon-ri, Byeongcheon-myeon, Cheonan-city, Korea 330-708
| | - Mun Hyeong Lee
- Department of Applied Chemical
Engineering, Korea University of Technology and Education, 307 Gajeon-ri, Byeongcheon-myeon, Cheonan-city, Korea 330-708
| | - YoonKook Park
- Department of Biological and
Chemical Engineering, Hongik University, Sejong, Korea 339-701
| | - Seong-Sik You
- Department of Applied Chemical
Engineering, Korea University of Technology and Education, 307 Gajeon-ri, Byeongcheon-myeon, Cheonan-city, Korea 330-708
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22
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Ingrosso F, Ladanyi BM. Intermolecular Structure and Collective Dynamics of Supercritical Fluoroform Studied by Molecular Dynamics Simulations. J Phys Chem B 2013; 117:654-67. [DOI: 10.1021/jp310246v] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Francesca Ingrosso
- Theoretical Chemistry and Biochemistry
Group SRSMC UMR 7565, CNRS − Université de Lorraine, Boulevard des Aiguillettes, BP 70239 54506
Vandoeuvre-lès-Nancy Cedex, France
- CNRS, SRSMC, UMR 7565,
Vandoeuvre-lès-Nancy, F-54506, France
| | - Branka M. Ladanyi
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523,
United States
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23
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Banerjee S, Sutanto S, Kleijn JM, van Roosmalen MJE, Witkamp GJ, Stuart MAC. Colloidal interactions in liquid CO2--a dry-cleaning perspective. Adv Colloid Interface Sci 2012; 175:11-24. [PMID: 22538166 DOI: 10.1016/j.cis.2012.03.005] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2011] [Revised: 03/16/2012] [Accepted: 03/16/2012] [Indexed: 11/28/2022]
Abstract
Liquid CO(2) is a viable alternative for the toxic and environmentally harmful solvents traditionally used in dry-cleaning industry. Although liquid CO(2) dry-cleaning is being applied already at a commercial scale, it is still a relatively young technique which poses many challenges. The focus of this review is on the causes of the existing problems and directions to solve them. After presenting an overview of the state-of-the-art, we analyze the detergency challenges from the fundamentals of colloid and interface science. The properties of liquid CO(2) such as dielectric constant, density, Hamaker constant, refractive index, viscosity and surface tension are presented and in the subsequent chapters their effects on CO(2) dry-cleaning operation are delineated. We show, based on theory, that the van der Waals forces between a model soil (silica) and model fabric (cellulose) through liquid CO(2) are much stronger compared to those across water or the traditional dry-cleaning solvent PERC (perchloroethylene). Prevention of soil particle redeposition in liquid CO(2) by electrostatic stabilization is challenging and the possibility of using electrolytes having large anionic parts is discussed. Furthermore, the role of different additives used in dry-cleaning, such as water, alcohol and surfactants, is reviewed. Water is not only used as an aid to remove polar soils, but also enhances adhesion between fabric and soil by forming capillary bridges. Its role as a minor component in liquid CO(2) is complex as it depends on many factors, such as the chemical nature of fabrics and soil, and also on the state of water itself, whether present as molecular solution in liquid CO(2) or phase separated droplets. The phenomena of wicking and wetting in liquid CO(2) systems are predicted from the Washburn-Lucas equation for fabrics of various surface energies and pore sizes. It is shown that nearly complete wetting is desirable for good detergency. The effect of mechanical action and fluid dynamic conditions on dry-cleaning is analyzed theoretically. From this it follows that in liquid CO(2) an order of magnitude higher Reynold's number is required to exceed the binding forces between fabric and soil as opposed to PERC or water, mainly due to the strong van der Waals forces and the low viscosity of CO(2) at dry-cleaning operational conditions.
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Affiliation(s)
- Soumi Banerjee
- Laboratory of Physical Chemistry and Colloid Science, Dreijenplein 6, Wageningen University, Wageningen, The Netherlands.
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Gutkowski KI, Fernández-Prini R, Aramendía PF, Japas ML. Critical Effects on Attractive Solutes in Binary Liquid Mixtures Close to Their Consolute Point: A New Experimental Strategy. J Phys Chem B 2011; 115:15303-12. [DOI: 10.1021/jp209007y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Karin I. Gutkowski
- Gerencia Química, CAC, Comisión Nacional de Energía Atómica, Avenida Libertador 8250, 1429-Buenos Aires, Argentina
| | - Roberto Fernández-Prini
- Gerencia Química, CAC, Comisión Nacional de Energía Atómica, Avenida Libertador 8250, 1429-Buenos Aires, Argentina
- INQUIMAE/DQIAQF, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, 1428-Buenos Aires, Argentina
| | - Pedro F. Aramendía
- INQUIMAE/DQIAQF, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, 1428-Buenos Aires, Argentina
| | - M. Laura Japas
- Gerencia Química, CAC, Comisión Nacional de Energía Atómica, Avenida Libertador 8250, 1429-Buenos Aires, Argentina
- Escuela de Ciencia y Tecnología, Universidad Nacional de San Martín, Martín de Irigoyen 3100, 1650-San Martín, Provincia Buenos Aires, Argentina
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Excited state intramolecular charge transfer reaction in non-aqueous reverse micelles: Effects of solvent confinement and electrolyte concentration#. J CHEM SCI 2011. [DOI: 10.1007/s12039-011-0149-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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Dellis D, Skarmoutsos I, Samios J. Solvation Structure and Dynamics of cis- and trans-1,2 Dichloroethene Isomers in Supercritical Carbon Dioxide. A Molecular Dynamics Simulation Study. J Phys Chem B 2011; 115:12098-107. [DOI: 10.1021/jp204202p] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Dimitris Dellis
- University of Athens, Department of Chemistry, Laboratory of Physical Chemistry, Panepistimiopolis 157-71, Athens, Greece
| | - Ioannis Skarmoutsos
- Department of Chemistry, Imperial College London, London SW7 2AZ, United Kingdom
| | - Jannis Samios
- University of Athens, Department of Chemistry, Laboratory of Physical Chemistry, Panepistimiopolis 157-71, Athens, Greece
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Gazi HAR, Biswas R. Heterogeneity in Binary Mixtures of (Water + Tertiary Butanol): Temperature Dependence Across Mixture Composition. J Phys Chem A 2011; 115:2447-55. [DOI: 10.1021/jp109772h] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Harun Al Rasid Gazi
- Department of Chemical, Biological & Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700 098, India
| | - Ranjit Biswas
- Department of Chemical, Biological & Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700 098, India
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Das A, Biswas R, Chakrabarti J. Dipolar Solute Rotation in a Supercritical Polar Fluid. J Phys Chem A 2011; 115:973-8. [DOI: 10.1021/jp1086398] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Amit Das
- Department of Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Block JD, Sector III, Salt Lake, Kolkata-700 098, India
| | - Ranjit Biswas
- Department of Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Block JD, Sector III, Salt Lake, Kolkata-700 098, India
| | - J. Chakrabarti
- Department of Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Block JD, Sector III, Salt Lake, Kolkata-700 098, India
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A study of solvation of benzaldehyde and cinnamaldehyde in CO2 by molecular dynamics simulation. Chem Phys Lett 2010. [DOI: 10.1016/j.cplett.2010.04.046] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Adkins SS, Chen X, Chan I, Torino E, Nguyen QP, Sanders AW, Johnston KP. Morphology and stability of CO2-in-water foams with nonionic hydrocarbon surfactants. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:5335-5348. [PMID: 20345107 DOI: 10.1021/la903663v] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The morphologies, stabilities, and viscosities of high-pressure carbon dioxide-in-water (C/W) foams (emulsions) formed with branched nonionic hydrocarbon surfactants were investigated by in situ optical microscopy and capillary rheology. Over two dozen hydrocarbon surfactants were shown to stabilize C/W foams with Sauter mean bubble diameters as low as 1 to 2 microm. Coalescence of the C/W foam bubbles was rare for bubbles larger than about 0.5 microm over a 60 h time frame, and Ostwald ripening became very slow. By better blocking of the CO(2) and water phases with branched and double-tailed surfactants, the interfacial tension decreases, the surface pressure increases, and the C/W foams become very stable. For branched surfactants with propylene oxide middle groups, the stabilities were markedly lower for air/water foams and decane-water emulsions. The greater stability of the C/W foams to coalescence may be attributed to a smaller capillary pressure, lower drainage rates, and a sufficient surface pressure and thus limiting surface elasticity, plus small film sizes, to hinder spatial and surface density fluctuations that lead to coalescence. Unexpectedly, the foams were stable even when the surfactant favored the CO(2) phase over the water phase, in violation of Bancroft's rule. This unusual behavior is influenced by the low drainage rate, which makes Marangoni stabilization of less consequence and the strong tendency of emerging holes in the lamella to close as a result of surfactant tail flocculation in CO(2). The high distribution coefficient toward CO(2) versus water is of significant practical interest for mobility control in CO(2) sequestration and enhanced oil recovery by foam formation.
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Affiliation(s)
- Stephanie S Adkins
- Department of Chemical Engineering, University of Texas, Austin, Texas 78712, USA
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Cabaço MI, Besnard M, Longelin S, Danten Y. Evolution with the density of CO2 clustering studied by Raman spectroscopy. J Mol Liq 2010. [DOI: 10.1016/j.molliq.2009.09.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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33
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Guchhait B, Al Rasid Gazi H, Kashyap HK, Biswas R. Fluorescence Spectroscopic Studies of (Acetamide + Sodium/Potassium Thiocyanates) Molten Mixtures: Composition and Temperature Dependence. J Phys Chem B 2010; 114:5066-81. [DOI: 10.1021/jp1001176] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Biswajit Guchhait
- Department of Chemical, Biological and Macromolecular Sciences, and Unit for Nanoscience and Nanotechnology, S. N. Bose National Centre for Basic Sciences, Block-JD, Sector-III, Salt Lake, Kolkata-700098, India
| | - Harun Al Rasid Gazi
- Department of Chemical, Biological and Macromolecular Sciences, and Unit for Nanoscience and Nanotechnology, S. N. Bose National Centre for Basic Sciences, Block-JD, Sector-III, Salt Lake, Kolkata-700098, India
| | - Hemant K. Kashyap
- Department of Chemical, Biological and Macromolecular Sciences, and Unit for Nanoscience and Nanotechnology, S. N. Bose National Centre for Basic Sciences, Block-JD, Sector-III, Salt Lake, Kolkata-700098, India
| | - Ranjit Biswas
- Department of Chemical, Biological and Macromolecular Sciences, and Unit for Nanoscience and Nanotechnology, S. N. Bose National Centre for Basic Sciences, Block-JD, Sector-III, Salt Lake, Kolkata-700098, India
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34
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Skarmoutsos I, Guardia E. Effect of the local hydrogen bonding network on the reorientational and translational dynamics in supercritical water. J Chem Phys 2010; 132:074502. [DOI: 10.1063/1.3305326] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
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Yang X, Qin Z, Wang G, Wang J. Molecular dynamics simulation of benzene-propene-cumene mixtures in different phases. J Phys Chem B 2009; 113:12299-305. [PMID: 19694424 DOI: 10.1021/jp903562m] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Molecular dynamics simulations have been performed to study the microscopic configuration and dynamic behavior of mixtures of benzene, propene, and cumene for the cumene synthesis process. The comparisons have been made for the intermolecular radial distribution functions of the binary and ternary mixtures at the conditions that are near, below, and above their respective critical points. The results have shown that in both binary and ternary mixtures propene molecules have a small tendency to cluster in the liquid state, but at supercritical conditions they tend to be uniformly distributed. Contrary to propene, cumene molecules have a tendency to cluster in ternary mixtures. A moderate local density augmentation is also found in the benzene-propene binary supercritical fluid. The excess functions for benzene-propene binary mixtures have shown that there exists an enhancement of the potential energy when benzene mixes with propene. This enhancement provides a rational explanation for the experimental critical properties, which exhibit the behavior of the nonmonotonous dependence of critical pressure on compositions.
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Affiliation(s)
- Xiaofeng Yang
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, Shanxi 030001, China.
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Excited state intramolecular charge transfer reaction in 4-(1-azetidinyl)benzonitrile: Solvent isotope effects. J CHEM SCI 2009. [DOI: 10.1007/s12039-009-0011-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Skarmoutsos I, Dellis D, Samios J. The Effect of Intermolecular Interactions on Local Density Inhomogeneities and Related Dynamics in Pure Supercritical Fluids. A Comparative Molecular Dynamics Simulation Study. J Phys Chem B 2009; 113:2783-93. [DOI: 10.1021/jp809271n] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Ioannis Skarmoutsos
- Department of Chemistry, Laboratory of Physical Chemistry, University of Athens, Panepistimiopolis 157-71, Athens, Greece
| | - Dimitris Dellis
- Department of Chemistry, Laboratory of Physical Chemistry, University of Athens, Panepistimiopolis 157-71, Athens, Greece
| | - Jannis Samios
- Department of Chemistry, Laboratory of Physical Chemistry, University of Athens, Panepistimiopolis 157-71, Athens, Greece
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39
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Ehlers F, Lenzer T, Oum K. Excited-State Dynamics of 12′-Apo-β-caroten-12′-al and 8′-Apo-β-caroten-8′-al in Supercritical CO2, N2O, and CF3H. J Phys Chem B 2008; 112:16690-700. [DOI: 10.1021/jp807086n] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Florian Ehlers
- Max-Planck-Institut für biophysikalische Chemie, Abt. Spektroskopie und Photochemische Kinetik (10100), Am Fassberg 11, 37077 Göttingen, Germany, and Georg-August-Universität Göttingen, Institut für Physikalische Chemie, Tammannstrasse 6, 37077 Göttingen, Germany
| | - Thomas Lenzer
- Max-Planck-Institut für biophysikalische Chemie, Abt. Spektroskopie und Photochemische Kinetik (10100), Am Fassberg 11, 37077 Göttingen, Germany, and Georg-August-Universität Göttingen, Institut für Physikalische Chemie, Tammannstrasse 6, 37077 Göttingen, Germany
| | - Kawon Oum
- Max-Planck-Institut für biophysikalische Chemie, Abt. Spektroskopie und Photochemische Kinetik (10100), Am Fassberg 11, 37077 Göttingen, Germany, and Georg-August-Universität Göttingen, Institut für Physikalische Chemie, Tammannstrasse 6, 37077 Göttingen, Germany
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40
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Biswas R, Rohman N, Pradhan T, Buchner R. Intramolecular charge transfer reaction, polarity, and dielectric relaxation in AOT/water/heptane reverse micelles: pool size dependence. J Phys Chem B 2008; 112:9379-88. [PMID: 18630864 DOI: 10.1021/jp8023149] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Intramolecular charge transfer (ICT) reaction in a newly synthesized molecule, of 4-(1-morpholenyl) benzonitrile (M6C), in AOT/water/heptane reverse micelles at different pool sizes has been studied by using steady-state and time-resolved fluorescence emission spectroscopy. The pool size dependences of the reaction equilibrium constant and reaction rate have been explained in terms of the average polarity of the confined solvent pools estimated from the fluorescence emission Stokes shift of a nonreactive probe, coumarin 153, dissolved in these microemulsions. The complex permittivity measurements in the frequency range 0.01<or=nu/GHz<or=2 for these microemulsions at different pool sizes (0<or=w0<or=40) and AOT concentrations (0.1<or=c/M<or=0.5) at 298.15 K have also been performed. At sufficient water content, a large dispersion with a relaxation time of approximately 600 ps has been observed at approximately 300 MHz and attributed to the average reorientation of water molecules residing in the close vicinity of the polar interface of the AOT headgroup and n-heptane. The reorientation of these interfacial water molecules is probably responsible for the nanosecond component observed in numerous polar solvation dynamics experiments in these reverse micelles. Subsequently, the estimated polarity and the measured reorientational time scale have been used to explain the dramatic slowing down of the ICT reaction rate and its dependence on pool size in these confined environments.
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Affiliation(s)
- Ranjit Biswas
- Department of Chemical, Biological and Macromolecular Sciences, and Unit for Nanoscience and Technology, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700 098, India.
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41
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Fujisawa T, Terazima M, Kimura Y. Solvent Effects on the Local Structure of p-Nitroaniline in Supercritical Water and Supercritical Alcohols. J Phys Chem A 2008; 112:5515-26. [DOI: 10.1021/jp710530m] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tomotsumi Fujisawa
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto, 606-8502, Japan, and Division of Research Initiatives, International Innovation Center, Kyoto University, Kyoto, 606-8501, Japan
| | - Masahide Terazima
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto, 606-8502, Japan, and Division of Research Initiatives, International Innovation Center, Kyoto University, Kyoto, 606-8501, Japan
| | - Yoshifumi Kimura
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto, 606-8502, Japan, and Division of Research Initiatives, International Innovation Center, Kyoto University, Kyoto, 606-8501, Japan
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42
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Biswas R, Das AR, Pradhan T, Touraud D, Kunz W, Mahiuddin S. Spectroscopic Studies of Catanionic Reverse Microemulsion: Correlation with the Superactivity of Horseradish Peroxidase Enzyme in a Restricted Environment. J Phys Chem B 2008; 112:6620-8. [DOI: 10.1021/jp711368p] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Ranjit Biswas
- Department of Chemical, Biological and Macromolecular Sciences, and Unit for Nanoscience and Technology, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake City, Kolkata 700 098, India, Institute of Physical and Theoretical Chemistry, University of Regensburg, D-93040 Regensburg, Germany, and Material Science Division, North−East Institute of Science and Technology, Jorhat 785006, Assam, India
| | - Arup R. Das
- Department of Chemical, Biological and Macromolecular Sciences, and Unit for Nanoscience and Technology, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake City, Kolkata 700 098, India, Institute of Physical and Theoretical Chemistry, University of Regensburg, D-93040 Regensburg, Germany, and Material Science Division, North−East Institute of Science and Technology, Jorhat 785006, Assam, India
| | - Tuhin Pradhan
- Department of Chemical, Biological and Macromolecular Sciences, and Unit for Nanoscience and Technology, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake City, Kolkata 700 098, India, Institute of Physical and Theoretical Chemistry, University of Regensburg, D-93040 Regensburg, Germany, and Material Science Division, North−East Institute of Science and Technology, Jorhat 785006, Assam, India
| | - Didier Touraud
- Department of Chemical, Biological and Macromolecular Sciences, and Unit for Nanoscience and Technology, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake City, Kolkata 700 098, India, Institute of Physical and Theoretical Chemistry, University of Regensburg, D-93040 Regensburg, Germany, and Material Science Division, North−East Institute of Science and Technology, Jorhat 785006, Assam, India
| | - Werner Kunz
- Department of Chemical, Biological and Macromolecular Sciences, and Unit for Nanoscience and Technology, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake City, Kolkata 700 098, India, Institute of Physical and Theoretical Chemistry, University of Regensburg, D-93040 Regensburg, Germany, and Material Science Division, North−East Institute of Science and Technology, Jorhat 785006, Assam, India
| | - Sekh Mahiuddin
- Department of Chemical, Biological and Macromolecular Sciences, and Unit for Nanoscience and Technology, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake City, Kolkata 700 098, India, Institute of Physical and Theoretical Chemistry, University of Regensburg, D-93040 Regensburg, Germany, and Material Science Division, North−East Institute of Science and Technology, Jorhat 785006, Assam, India
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Pradhan T, Ghoshal P, Biswas R. Structural transition in alcohol-water binary mixtures: A spectroscopic study. J CHEM SCI 2008. [DOI: 10.1007/s12039-008-0033-0] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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44
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Gohres JL, Kitchens CL, Hallett JP, Popov AV, Hernandez R, Liotta CL, Eckert CA. A Spectroscopic and Computational Exploration of the Cybotactic Region of Gas-Expanded Liquids: Methanol and Acetone. J Phys Chem B 2008; 112:4666-73. [DOI: 10.1021/jp077552p] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- John L. Gohres
- School of Chemical & Biomolecular Engineering, School of Chemistry and Biochemistry, Specialty Separations Center, and Center for Computational and Molecular Science and Technology, Georgia Institute of Technology, Atlanta, Georgia 30332
| | - Christopher L. Kitchens
- School of Chemical & Biomolecular Engineering, School of Chemistry and Biochemistry, Specialty Separations Center, and Center for Computational and Molecular Science and Technology, Georgia Institute of Technology, Atlanta, Georgia 30332
| | - Jason P. Hallett
- School of Chemical & Biomolecular Engineering, School of Chemistry and Biochemistry, Specialty Separations Center, and Center for Computational and Molecular Science and Technology, Georgia Institute of Technology, Atlanta, Georgia 30332
| | - Alexander V. Popov
- School of Chemical & Biomolecular Engineering, School of Chemistry and Biochemistry, Specialty Separations Center, and Center for Computational and Molecular Science and Technology, Georgia Institute of Technology, Atlanta, Georgia 30332
| | - Rigoberto Hernandez
- School of Chemical & Biomolecular Engineering, School of Chemistry and Biochemistry, Specialty Separations Center, and Center for Computational and Molecular Science and Technology, Georgia Institute of Technology, Atlanta, Georgia 30332
| | - Charles L. Liotta
- School of Chemical & Biomolecular Engineering, School of Chemistry and Biochemistry, Specialty Separations Center, and Center for Computational and Molecular Science and Technology, Georgia Institute of Technology, Atlanta, Georgia 30332
| | - Charles A. Eckert
- School of Chemical & Biomolecular Engineering, School of Chemistry and Biochemistry, Specialty Separations Center, and Center for Computational and Molecular Science and Technology, Georgia Institute of Technology, Atlanta, Georgia 30332
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Pradhan T, Ghoshal P, Biswas R. Excited State Intramolecular Charge Transfer Reaction in Binary Mixtures of Water and Tertiary Butanol (TBA): Alcohol Mole Fraction Dependence. J Phys Chem A 2008; 112:915-24. [DOI: 10.1021/jp0770460] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Tuhin Pradhan
- Department of Chemical, Biological and Macromolecular Sciences, and Unit for Nanoscience and Technology, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake City, Kolkata 700 098, India
| | - Piue Ghoshal
- Department of Chemical, Biological and Macromolecular Sciences, and Unit for Nanoscience and Technology, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake City, Kolkata 700 098, India
| | - Ranjit Biswas
- Department of Chemical, Biological and Macromolecular Sciences, and Unit for Nanoscience and Technology, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake City, Kolkata 700 098, India
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46
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Cabaço MI, Longelin S, Danten Y, Besnard M. Local Density Enhancement in Supercritical Carbon Dioxide Studied by Raman Spectroscopy. J Phys Chem A 2007; 111:12966-71. [DOI: 10.1021/jp0756707] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- M. Isabel Cabaço
- Centro de Física Atómica da UL, Av. Prof. Gama Pinto 2, 1694-003 Lisboa Codex and Departamento de Física, Instituto Superior Técnico, UTL, Av. Rovisco Pais 1049-001 Lisboa, Portugal, and Institut des Sciences Moléculaires, CNRS (UMR 5255), Université Bordeaux 1, 351 Cours de la Libération 33405 Talence Cedex, France
| | - S. Longelin
- Centro de Física Atómica da UL, Av. Prof. Gama Pinto 2, 1694-003 Lisboa Codex and Departamento de Física, Instituto Superior Técnico, UTL, Av. Rovisco Pais 1049-001 Lisboa, Portugal, and Institut des Sciences Moléculaires, CNRS (UMR 5255), Université Bordeaux 1, 351 Cours de la Libération 33405 Talence Cedex, France
| | - Y. Danten
- Centro de Física Atómica da UL, Av. Prof. Gama Pinto 2, 1694-003 Lisboa Codex and Departamento de Física, Instituto Superior Técnico, UTL, Av. Rovisco Pais 1049-001 Lisboa, Portugal, and Institut des Sciences Moléculaires, CNRS (UMR 5255), Université Bordeaux 1, 351 Cours de la Libération 33405 Talence Cedex, France
| | - M. Besnard
- Centro de Física Atómica da UL, Av. Prof. Gama Pinto 2, 1694-003 Lisboa Codex and Departamento de Física, Instituto Superior Técnico, UTL, Av. Rovisco Pais 1049-001 Lisboa, Portugal, and Institut des Sciences Moléculaires, CNRS (UMR 5255), Université Bordeaux 1, 351 Cours de la Libération 33405 Talence Cedex, France
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Pradhan T, Biswas R. Electrolyte-Concentration and Ion-Size Dependence of Excited-State Intramolecular Charge-Transfer Reaction in (Alkylamino)benzonitriles: Steady-State Spectroscopic Studies. J Phys Chem A 2007; 111:11514-23. [DOI: 10.1021/jp075820d] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Tuhin Pradhan
- Department of Chemical, Biological & Macromolecular Sciences, and Unit for Nano Science & Technology, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700 098, India
| | - Ranjit Biswas
- Department of Chemical, Biological & Macromolecular Sciences, and Unit for Nano Science & Technology, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700 098, India
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Vener MV, Tovmash AV, Rostov IV, Basilevsky MV. Molecular simulations of outersphere reorganization energies in polar and quadrupolar solvents. The case of intramolecular electron and hole transfer. J Phys Chem B 2007; 110:14950-5. [PMID: 16869609 DOI: 10.1021/jp061069h] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Outersphere reorganization energies (lambda) for intramolecular electron and hole transfer are studied in anion- and cation-radical forms of complex organic substrates (p-phenylphenyl-spacer-naphthyl) in polar (water, 1,2-dichloroethane, tetrahydrofuran) and quadrupolar (supercritical CO2) solvents. Structure and charge distributions of solute molecules are obtained at the HF/6-31G(d,p) level. Standard Lennard-Jones parameters for solutes and the nonpolarizable simple site-based models of solvents are used in molecular dynamics (MD) simulations. Calculation of lambda is done by means of the original procedure, which treats electrostatic polarization of a solvent in terms of a usual nonpolarizable MD scheme supplemented by scaling of reorganization energies at the final stage. This approach provides a physically relevant background for separating inertial and inertialless polarization responses by means of a single parameter epsilon(infinity), optical dielectric permittivity of the solvent. Absolute lambda values for hole transfer in 1,2-dichloroethane agree with results of previous computations in terms of the different technique (MD/FRCM, Leontyev, I. V.; et al. Chem. Phys. 2005, 319, 4). Computed lambda values for electron transfer in tetrahydrofuran are larger than the experimental values by ca. 2.5 kcal/mol; for the case of hole transfer in 1,2-dichloroethane the discrepancy is of similar magnitude provided the experimental data are properly corrected. The MD approach gives nonzero lambda values for charge-transfer reaction in supercritical CO2, being able to provide a uniform treatment of nonequilibrium solvation phenomena in both quadrupolar and polar solvents.
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Affiliation(s)
- M V Vener
- Karpov Institute of Physical Chemistry, ul. Vorontsovo Pole 10, Moscow 105064, Russia
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Local density augmentation of excited 1-(dimethylamino)naphthalene in supercritical water. J Supercrit Fluids 2006. [DOI: 10.1016/j.supflu.2006.02.013] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Skarmoutsos I, Samios J. Local Density Inhomogeneities and Dynamics in Supercritical Water: A Molecular Dynamics Simulation Approach. J Phys Chem B 2006; 110:21931-7. [PMID: 17064161 DOI: 10.1021/jp060955p] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Molecular dynamics atomistic simulations in the canonical ensemble (NVT-MD) have been used to investigate the "Local Density Inhomogeneities and their Dynamics" in pure supercritical water. The simulations were carried out along a near-critical isotherm (Tr = T/Tc = 1.03) and for a wide range of densities below and above the critical one (0.2 rho(c) - 2.0 rho(c)). The results obtained reveal the existence of significant local density augmentation effects, which are found to be sufficiently larger in comparison to those reported for nonassociated fluids. The time evolution of the local density distribution around each molecule was studied in terms of the appropriate time correlation functions C(Delta)rhol(t). It is found that the shape of these functions changes significantly by increasing the density of the fluid. Finally, the local density reorganization times for the first and second coordination shell derived from these correlations exhibit a decreasing behavior by increasing the density of the system, signifying the density effect upon the dynamics of the local environment around each molecule.
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Affiliation(s)
- Ioannis Skarmoutsos
- Department of Chemistry, Laboratory of Physical Chemistry, University of Athens, Panepistimiopolis 157-71, Athens, Greece
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