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Czaderna-Lekka A, Tarnacka M, Wojnarowska Z, Hachuła B, Paluch M, Kamiński K. On the relationship between the Debye process in dielectric response and a dissociation-association phenomenon in phenyl alcohols. Phys Chem Chem Phys 2023; 25:14590-14597. [PMID: 37191250 DOI: 10.1039/d3cp00816a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
In this paper, we have examined a series of phenyl-substituted primary monohydroxy alcohols (phenyl alcohols, PhAs), from ethanol to hexanol by means of dielectric and Fourier transform infrared (FTIR) spectroscopies supported by the mechanical investigations. The combination of both dielectric and mechanical data allows calculation of the energy barrier, Ea, for dissociation by the Rubinstein approach developed to describe the dynamical properties of self-assembling macromolecules. It was observed that the determined activation energy remains constant, |Ea,RM| ∼ 12.9-14.2 kJ mol-1, regardless of the molecular weight of the examined material. Surprisingly, the obtained values agree very well with Ea of the dissociation process determined from the FTIR data analysed within the van't Hoff relationship, where Ea,vH ∼ 9.13-13.64 kJ mol-1. Thus, the observed agreement between Ea determined by both applied approaches clearly implies that in the case of the examined series of PhAs, the dielectric Debye-like process is governed by the association-dissociation phenomenon as proposed by the transient chain model.
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Affiliation(s)
- Anna Czaderna-Lekka
- August Chełkowski Institute of Physics, University of Silesia in Katowice, 75 Pułku Piechoty 1, 41-500 Chorzów, Poland.
| | - Magdalena Tarnacka
- August Chełkowski Institute of Physics, University of Silesia in Katowice, 75 Pułku Piechoty 1, 41-500 Chorzów, Poland.
| | - Zaneta Wojnarowska
- August Chełkowski Institute of Physics, University of Silesia in Katowice, 75 Pułku Piechoty 1, 41-500 Chorzów, Poland.
| | - Barbara Hachuła
- Institute of Chemistry, University of Silesia in Katowice, Szkolna 9, 40-006 Katowice, Poland
| | - Marian Paluch
- August Chełkowski Institute of Physics, University of Silesia in Katowice, 75 Pułku Piechoty 1, 41-500 Chorzów, Poland.
| | - Kamil Kamiński
- August Chełkowski Institute of Physics, University of Silesia in Katowice, 75 Pułku Piechoty 1, 41-500 Chorzów, Poland.
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2
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Zhai Y, Luo P, Nagao M, Nakajima K, Kikuchi T, Kawakita Y, Kienzle PA, Z Y, Faraone A. Relevance of hydrogen bonded associates to the transport properties and nanoscale dynamics of liquid and supercooled 2-propanol. Phys Chem Chem Phys 2021; 23:7220-7232. [PMID: 33876082 DOI: 10.1039/d0cp05481j] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
2-Propanol was investigated, in both the liquid and supercooled states, as a model system to study how hydrogen bonds affect the structural relaxation and the dynamics of mesoscale structures, of approximately several Ångstroms, employing static and quasi-elastic neutron scattering and molecular dynamics simulation. Dynamic neutron scattering measurements were performed over an exchanged wave-vector range encompassing the pre-peak, indicative of the presence of H-bonding associates, and the main peak. The dynamics observed at the pre-peak is associated with the formation and disaggregation of the H-bonded associates and is measured to be at least one order of magnitude slower than the dynamics at the main peak, which is identified as the structural relaxation. The measurements indicate that the macroscopic shear viscosity has a similar temperature dependence as the dynamics of the H-bonded associates, which highlights the important role played by these structures, together with the structural relaxation, in defining the macroscopic rheological properties of the system. Importantly, the characteristic relaxation time at the pre-peak follows an Arrhenius temperature dependence whereas at the main peak it exhibits a non-Arrhenius behavior on approaching the supercooled state. The origin of this differing behavior is attributed to an increased structuring of the hydrophobic domains of 2-propanol accommodating a more and more encompassing H-bond network, and a consequent set in of dynamic cooperativity.
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Affiliation(s)
- Yanqin Zhai
- Department of Nuclear, Plasma, and Radiological Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
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3
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Tourlakis GM, Adamopoulos SAT, Gavra IK, Milpanis AA, Tsagri LF, Pachygianni ASG, Chatzikokolis SS, Tsekouras AA. Sign flipping of spontaneous polarization in vapour-deposited films of small polar organic molecules. Phys Chem Chem Phys 2021; 23:14352-14362. [PMID: 34169950 DOI: 10.1039/d1cp01584b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Films of polar molecules vapour-deposited on sufficiently cold substrates are not only amorphous, but also exhibit charge polarization across their thickness. This is an effect known for 50 years, but it is very poorly understood and no mechanism exists in the literature that can explain and predict it. We investigated this bulk effect for 18 small organic molecules as a function of substrate temperature (30-130 K). We found that, as a rule, alcohol films have the negative end on the vacuum side at all temperatures. Alkyl acetates and toluene showed positive voltages which reached a maximum around the middle of the temperature range investigated. Tetrahydrofuran showed positive voltages which dropped with increasing deposition temperature. Diethyl ether, acetone, propanal, and butanal showed positive film voltages at low temperatures, negative at intermediate temperatures and again positive voltages at higher temperatures. In all cases, film voltages were monitored during heating leading to film evaporation. Film voltages were irreversibly eliminated before film elimination, but voltage profiles during temperature ramps differed vastly depending on compound and deposition temperature. In general, there was a gradual voltage reduction, but propanal, butanal, and diethyl ether showed a change in voltage sign during temperature ramp in films deposited at low temperatures. All these data expand substantially the experimental information regarding spontaneous polarization in vapour-deposited films, but still require complementary measurements as well as numerical simulations for a detailed explanation of the phenomenon.
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Affiliation(s)
- Georgios M Tourlakis
- Physical Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, Zografos, GR-15784, Greece.
| | - Sotirios Alexandros T Adamopoulos
- Physical Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, Zografos, GR-15784, Greece.
| | - Irini K Gavra
- Physical Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, Zografos, GR-15784, Greece.
| | - Alexandros A Milpanis
- Physical Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, Zografos, GR-15784, Greece.
| | - Liveria F Tsagri
- Physical Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, Zografos, GR-15784, Greece.
| | - Aikaterini Sofia G Pachygianni
- Physical Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, Zografos, GR-15784, Greece.
| | - Stylianos S Chatzikokolis
- Physical Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, Zografos, GR-15784, Greece.
| | - Athanassios A Tsekouras
- Physical Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, Zografos, GR-15784, Greece.
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4
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Ngai KL, Wang LM. Relations between the Structural α-Relaxation and the Johari-Goldstein β-Relaxation in Two Monohydroxyl Alcohols: 1-Propanol and 5-Methyl-2-hexanol. J Phys Chem B 2019; 123:714-719. [PMID: 30601008 DOI: 10.1021/acs.jpcb.8b11453] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The hydrogen-bonded monohydroxyl alcohols form a large class of glass formers studied more than one hundred years, and still the structure and dynamics have continued to be a research problem. Recent advance suggests a hydrogen-bonded transient supramolecular structure, which is the origin of the Debye relaxation dominating the dielectric loss spectra of many monohydroxyl alcohols. Obscured by the slower Debye relaxation, the structural α-relaxation is either not resolved or showing up as a shoulder and the supposedly universal Johari-Goldstein (JG) β-relaxation is not always observed. Thus, properties of the α-relaxation and the JG β-relaxation as well as the strong connection between the two relaxations generally observed in other classes of glass formers are not commonly known in the monohydroxyl alcohols. Notwithstanding, extremely broadband dielectric relaxation and high-precision light scattering experiments published recently have resolved the α-relaxation and a secondary relaxation in two archetypal monohydroxyl alcohols, 1-propanol and 5-methyl-2-hexanol (5M2H) by Gabriel et al. We analyzed their experimental data and applied the Coupling Model to show that the secondary relaxations in 1-propanol and 5M2H are JG β-relaxations with strong connection to the α-relaxation. The result is novel because it is not known before whether the secondary relaxations of these two monohydroxyl alcohols are JG β-relaxation involving the entire molecule or are intramolecular relaxations. On the basis of this conclusion, we predict that the secondary relaxation is pressure-dependent and the ratio τβ( T, P)/τα( T, P) is invariant to variations of P and T, whereas τα( T, P) is maintained constant and provided that the frequency dispersion of the α-relaxation is also constant. The prediction is compared with the dielectric data of 5M2H at elevated pressures. On the basis of the identification of monohydroxyl alcohols as short-chain polymeric liquids by others, an explanation of the stronger T and P dependences of τα( T, P) than the Debye relaxation time τD( T, P) is given.
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Affiliation(s)
- K L Ngai
- CNR-IPCF, Università di Pisa , Largo B. Pontecorvo 3 , I-56127 Pisa , Italy.,State Key Lab of Metastable Materials Science and Technology, and College of Materials Science and Engineering , Yanshan University , Qinhuangdao , Hebei 066004 , China
| | - Li-Min Wang
- State Key Lab of Metastable Materials Science and Technology, and College of Materials Science and Engineering , Yanshan University , Qinhuangdao , Hebei 066004 , China
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Jensen MH, Gainaru C, Alba-Simionesco C, Hecksher T, Niss K. Slow rheological mode in glycerol and glycerol–water mixtures. Phys Chem Chem Phys 2018; 20:1716-1723. [DOI: 10.1039/c7cp06482a] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Glycerol–water mixtures were studied at molar concentrations ranging from xgly = 1 (neat glycerol) to xgly = 0.3 using shear mechanical spectroscopy.
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Affiliation(s)
- M. H. Jensen
- Glass & Time, IMFUFA, Department of Science and Environment, Roskilde University
- DK-4000 Roskilde
- Denmark
- Laboratoire Léon Brillouin, CNRS CEA-UMR 12, CEA Saclay
- 91191 Gif-sur-Yvette Cedex
| | - C. Gainaru
- Fakultät Physik, Technische Universität Dortmund
- 44221 Dortmund
- Germany
| | - C. Alba-Simionesco
- Laboratoire Léon Brillouin, CNRS CEA-UMR 12, CEA Saclay
- 91191 Gif-sur-Yvette Cedex
- France
| | - T. Hecksher
- Glass & Time, IMFUFA, Department of Science and Environment, Roskilde University
- DK-4000 Roskilde
- Denmark
| | - K. Niss
- Glass & Time, IMFUFA, Department of Science and Environment, Roskilde University
- DK-4000 Roskilde
- Denmark
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6
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Adrjanowicz K, Jakobsen B, Hecksher T, Kaminski K, Dulski M, Paluch M, Niss K. Communication: Slow supramolecular mode in amine and thiol derivatives of 2-ethyl-1-hexanol revealed by combined dielectric and shear-mechanical studies. J Chem Phys 2015; 143:181102. [DOI: 10.1063/1.4935510] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Affiliation(s)
- K. Adrjanowicz
- Department of Sciences, DNRF Centre “Glass and Time,” IMFUFA, Roskilde University, P.O. Box 260, DK-4000 Roskilde, Denmark
- NanoBioMedical Centre, Adam Mickiewicz University, ul. Umultowska 85, 61-614 Poznan, Poland
| | - B. Jakobsen
- Department of Sciences, DNRF Centre “Glass and Time,” IMFUFA, Roskilde University, P.O. Box 260, DK-4000 Roskilde, Denmark
| | - T. Hecksher
- Department of Sciences, DNRF Centre “Glass and Time,” IMFUFA, Roskilde University, P.O. Box 260, DK-4000 Roskilde, Denmark
| | - K. Kaminski
- Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland
| | - M. Dulski
- Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland
| | - M. Paluch
- Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland
| | - K. Niss
- Department of Sciences, DNRF Centre “Glass and Time,” IMFUFA, Roskilde University, P.O. Box 260, DK-4000 Roskilde, Denmark
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7
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Mesele OO, Vartia AA, Laage D, Thompson WH. Reorientation of Isomeric Butanols: The Multiple Effects of Steric Bulk Arrangement on Hydrogen-Bond Dynamics. J Phys Chem B 2015; 120:1546-59. [DOI: 10.1021/acs.jpcb.5b07692] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Oluwaseun O. Mesele
- Department
of Chemistry, University of Kansas, Lawrence, Kansas 66045, United States
| | - Anthony A. Vartia
- Department
of Chemistry, University of Kansas, Lawrence, Kansas 66045, United States
| | - Damien Laage
- Department
of Chemistry, Ecole Normale Supérieure, UMR ENS-CNRS-UPMC 8640, 24 rue Lhmond, 75005 Paris, France
| | - Ward H. Thompson
- Department
of Chemistry, University of Kansas, Lawrence, Kansas 66045, United States
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8
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Saini MK, Murthy SSN. Glass Formation in Binary Solutions of Acetaminophen with Guaifenesin and Mephenesin. J SOLUTION CHEM 2015. [DOI: 10.1007/s10953-015-0364-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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9
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Li X, Chen Z, Li Z, Gao Y, Tu W, Li X, Zhang Y, Liu YD, Wang LM. Comparative study of dynamics in glass forming mixtures of Debye-type N-ethylacetamide with water, alcohol, and amine. J Chem Phys 2014; 141:104506. [DOI: 10.1063/1.4895066] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Xin Li
- State Key Lab of Metastable Materials Science and Technology, and College of Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei 066004, China
| | - Zeming Chen
- State Key Lab of Metastable Materials Science and Technology, and College of Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei 066004, China
| | - Zijing Li
- State Key Lab of Metastable Materials Science and Technology, and College of Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei 066004, China
| | - Yanqin Gao
- State Key Lab of Metastable Materials Science and Technology, and College of Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei 066004, China
| | - Wenkang Tu
- State Key Lab of Metastable Materials Science and Technology, and College of Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei 066004, China
| | - Xiangqian Li
- State Key Lab of Metastable Materials Science and Technology, and College of Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei 066004, China
| | - Yaqi Zhang
- State Key Lab of Metastable Materials Science and Technology, and College of Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei 066004, China
| | - Ying Dan Liu
- State Key Lab of Metastable Materials Science and Technology, and College of Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei 066004, China
| | - Li-Min Wang
- State Key Lab of Metastable Materials Science and Technology, and College of Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei 066004, China
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10
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Singh LP, Alba-Simionesco C, Richert R. Dynamics of glass-forming liquids. XVII. Dielectric relaxation and intermolecular association in a series of isomeric octyl alcohols. J Chem Phys 2014; 139:144503. [PMID: 24116631 DOI: 10.1063/1.4823998] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
It is well established that many mono-hydroxy alcohols show an extra relaxation process of the Debye type in addition to the signatures of primary and secondary structural relaxations, which is observed only in dielectric spectroscopy and related techniques. In order to gain further insight into the nature of this Debye peak, we study the linear and nonlinear dielectric behavior of a series of isomeric octyl alcohols and of mixtures of n-propanol with one of the octanols. These samples display systematic variations of the Debye peak intensity and concomitant changes in the Kirkwood correlation factor gK from 0.1 to 4, indicative of different equilibrium constants, K(c∕r), that characterize the populations of non-polar ring and polar open chain structures. For cases where K(c∕r) is not too far from unity, we find that a high electric field shifts K(c∕r) towards more chains, and that the accompanying change in the end-to-end vector of hydrogen-bond connected structures occurs on the Debye time scale. The results suggest that gK is correlated with the spectral separation of the Debye and primary structural peaks, as both features depend on steric hindrance of chain flexibility or bond rotation barriers and on average chain lengths. Based on the complex dynamics of supercooled mono-hydroxy alcohols with three relaxation peaks that cover many orders of magnitude in frequency, it is argued that a frequency dependent gK may be required for assessing the average orientational correlations within hydrogen-bonded structures correctly.
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Affiliation(s)
- Lokendra P Singh
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, USA
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11
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Gao Y, Bi D, Li X, Liu R, Tian Y, Wang LM. Debye-type dielectric relaxation in glass-forming 3-methylthio-1-hexanol. J Chem Phys 2013; 139:024503. [DOI: 10.1063/1.4812743] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
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12
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Pawlus S, Klotz S, Paluch M. Effect of compression on the relationship between viscosity and dielectric relaxation time in hydrogen-bonded primary alcohols. PHYSICAL REVIEW LETTERS 2013; 110:173004. [PMID: 23679720 DOI: 10.1103/physrevlett.110.173004] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2012] [Indexed: 06/02/2023]
Abstract
High pressure viscosity and dielectric measurements were carried out on two monohydroxy alcohols, 2-ethyl-1-hexanol and 5-methyl-2-hexanol, at room temperature. Analysis of the dielectric relaxation times versus viscosity revealed the breakdown of the Einstein-Debye relation above some characteristic pressure. The failure of the Einstein-Debye relation is a manifestation of pressure induced changes of supramolecular hydrogen bonded structures which occur in these liquids.
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Affiliation(s)
- S Pawlus
- Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland
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13
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Gong H, Chen Z, Bi D, Sun M, Tian Y, Wang LM. Unusual Dielectric Strength of Debye Relaxation in Monohydroxy Alcohols upon Mixing. J Phys Chem B 2012; 116:11482-7. [DOI: 10.1021/jp304110t] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hongxiang Gong
- State Key
Lab of Metastable Materials Science and Technology, and College of
Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei, 066004 China
| | - Zeming Chen
- State Key
Lab of Metastable Materials Science and Technology, and College of
Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei, 066004 China
| | - Dongyang Bi
- State Key
Lab of Metastable Materials Science and Technology, and College of
Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei, 066004 China
| | - Mingdao Sun
- State Key
Lab of Metastable Materials Science and Technology, and College of
Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei, 066004 China
| | - Yongjun Tian
- State Key
Lab of Metastable Materials Science and Technology, and College of
Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei, 066004 China
| | - Li-Min Wang
- State Key
Lab of Metastable Materials Science and Technology, and College of
Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei, 066004 China
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14
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Pawlus S, Paluch M, Dzida M. Molecular dynamics changes induced by solvent in 2-ethyl-1-hexanol. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2011; 84:031503. [PMID: 22060375 DOI: 10.1103/physreve.84.031503] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2011] [Indexed: 05/31/2023]
Abstract
Apart from other classes of materials, supramolecular structures may exist in H-bonded liquids due to the existence of hydrogen bonding. The dynamics of these structures remains one of the most exciting topics of interest of modern science because of its crucial meaning for the behavior of water and its participation in biological processes. A special group of these liquids form monohydroxy alcohols due to their similarity to water, their ability to vitrification, and the existence of the Debye relaxation process in dielectric loss spectra reflecting the dynamics of H-bond structures. Dynamics of these structures can be studied by changes of thermodynamic conditions, by immersion of the liquid into the constraint geometry, and by dilution in a nonassociated solvent. Herein we studied the behavior of relaxation dynamics of mixtures of 2-ethyl-1-hexanol with bromobutane using broadband dielectric spectroscopy. Analysis of the results exhibits the existence of crossover in temperature dependence of static permittivity of the Debye process at some particular temperature T(c). This temperature shifts to lower values with increasing concentration of bromobutane. Moreover, below some "critical" concentration of alcohol in the mixture the shape of the Debye process loses exponentiality and the temperature dependence of relaxation times starts to change. This change was illuminated based on the analysis of the steepness index. For the lowest concentration, the value of this parameter becomes the same as the value of the steepness index of faster relaxation, called process II, of pure alcohol at ambient pressure. The observed change in relaxation dynamics with lowering concentration of alcohol is astonishingly similar to the behavior observed in the same material at elevated pressure. A possible origin of these similarities is also discussed.
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Affiliation(s)
- Sebastian Pawlus
- Institute of Physics, University of Silesia, Uniwersytecka 4, PL-40-007 Katowice, Poland.
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15
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Hydrogen bond fluctuations and dispersive interactions of alcohol/alkane mixtures. An ultrasonic relaxation study. Chem Phys Lett 2011. [DOI: 10.1016/j.cplett.2011.05.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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16
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Lederle C, Hiller W, Gainaru C, Böhmer R. Diluting the hydrogen bonds in viscous solutions of n-butanol with n-bromobutane: II. A comparison of rotational and translational motions. J Chem Phys 2011; 134:064512. [DOI: 10.1063/1.3549123] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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17
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Jakobsen B, Maggi C, Christensen T, Dyre JC. Investigation of the shear-mechanical and dielectric relaxation processes in two monoalcohols close to the glass transition. J Chem Phys 2008; 129:184502. [DOI: 10.1063/1.3007988] [Citation(s) in RCA: 84] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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18
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El Goresy T, Böhmer R. Diluting the hydrogen bonds in viscous solutions of n-butanol with n-bromobutane: A dielectric study. J Chem Phys 2008; 128:154520. [DOI: 10.1063/1.2903403] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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19
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Huth H, Wang LM, Schick C, Richert R. Comparing calorimetric and dielectric polarization modes in viscous 2-ethyl-1-hexanol. J Chem Phys 2007; 126:104503. [PMID: 17362071 DOI: 10.1063/1.2539105] [Citation(s) in RCA: 106] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Dielectric relaxation and dynamic heat capacity measurements are compared for 2-ethyl-1-hexanol near its glass transition temperature Tg in order to further clarify the origin of the prominent Debye-type loss peak observed in many monohydroxy alcohols and other hydrogen-bonding liquids. While the dielectric spectrum epsilon" displays two distinct polarization processes that are separated by a factor of 2000 in terms of the peak frequency, the heat capacity cp" shows only a single peak. The dielectric process with lower amplitude and higher peak frequency coincides with the calorimetric signal, whereas the large dielectric Debye signal is not associated with calorimetric modes. The authors conclude that the Debye process corresponds to a transition among states which differ in energy only in the case of an external electric field.
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Affiliation(s)
- Heiko Huth
- Institute of Physics, University of Rostock, Universitätsplatz 3, 18051 Rostock, Germany
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Wang LM, Angell CA, Richert R. Fragility and thermodynamics in nonpolymeric glass-forming liquids. J Chem Phys 2007; 125:074505. [PMID: 16942349 DOI: 10.1063/1.2244551] [Citation(s) in RCA: 149] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
For nonpolymeric supercooled liquids, the empirical correlation m = 56Tg DeltaCp(Tg)/DeltaHm provides a reliable means of correlating dynamic and thermodynamic variables. The dynamics are characterized by the fragility or steepness index m and the glass transition temperature Tg, while thermodynamics enter in terms of the heat capacity step DeltaCp at Tg and the melting enthalpy DeltaHm. The combination of the above correlation with the 23 rule for the Tg/Tm ratio yields an expression, m = 40DeltaCp(Tg)/DeltaSm, which was rationalized as the correlation of the thermodynamic and kinetic fragilities. Defining a thermodynamic fragility via DeltaCp(Tg)/DeltaSm also reveals that the slopes in Kauzmann's original DeltaS(T)/DeltaSm versus T/Tm plot reflect the fragility concept [Chem. Rev. 43, 219 (1948)], so long as Tm/Tg = 1.5. For the many liquids whose excess heat capacity is a hyperbolic function of temperature, we deduce that the fragility cannot exceed m = 170, unless the Tg/Tm = 2/3 rule breaks down.
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Affiliation(s)
- Li-Min Wang
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, USA
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Affiliation(s)
- S.S.N. Murthy
- a School of Physical Sciences, Jawaharlal Nehru University , New Delhi , 110067 , India
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Syutkin V, Bol’shakov B, Dzhonson A. On the relation between oxygen diffusion and secondary relaxation in glassy n-butanol. Chem Phys 2006. [DOI: 10.1016/j.chemphys.2005.10.029] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Minoguchi A, Richert R, Angell CA. Dielectric Relaxation in Aqueous Solutions of Hydrazine and Hydrogen Peroxide: Water Structure Implications. J Phys Chem B 2004. [DOI: 10.1021/jp0471608] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ayumi Minoguchi
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604
| | - Ranko Richert
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604
| | - C. Austen Angell
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604
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Hiejima Y, Yao M. Dielectric relaxation of lower alcohols in the whole fluid phase. J Chem Phys 2003. [DOI: 10.1063/1.1609981] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Murthy SSN, Tyagi M. Experimental study of the high frequency relaxation process in monohydroxy alcohols. J Chem Phys 2002. [DOI: 10.1063/1.1494428] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Tyagi M, Murthy SSN. Study of the nature of glass transitions in the plastic crystalline phases of cyclo-octanol, cycloheptanol, cyanoadamantane and cis-1,2-dimethylcyclohexane. J Chem Phys 2001. [DOI: 10.1063/1.1342811] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Sudo S, Shinyashiki N, Yagihara S. The dielectric relaxation of supercooled ethyleneglycol-water mixtures. J Mol Liq 2001. [DOI: 10.1016/s0167-7322(01)00113-1] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Qi F, Schug KU, Dupont S, Döß A, Böhmer R, Sillescu H, Kolshorn H, Zimmermann H. Structural relaxation of the fragile glass-former propylene carbonate studied by nuclear magnetic resonance. J Chem Phys 2000. [DOI: 10.1063/1.481588] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
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Fitz BD, Mijovic J. Segmental Dynamics and Density Fluctuations in Polymer Networks during Chemical Vitrification. Macromolecules 1999. [DOI: 10.1021/ma981435y] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Benjamin D. Fitz
- Department of Chemical Engineering and Chemistry, Polytechnic University, Brooklyn, New York 11201
| | - Jovan Mijovic
- Department of Chemical Engineering and Chemistry, Polytechnic University, Brooklyn, New York 11201
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Ngai KL. Relation between some secondary relaxations and the α relaxations in glass-forming materials according to the coupling model. J Chem Phys 1998. [DOI: 10.1063/1.477334] [Citation(s) in RCA: 353] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Vyazovkin VL, Tolkatchev VA. Methyl radicals migration in glassy ethanol-1,2d5 at 90 K as studied by hydrogen atom abstraction from the additives. Chem Phys 1997. [DOI: 10.1016/s0301-0104(96)00354-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Murthy SSN. Dielectric Relaxation in Monohydroxy Alcohols and Its Connection to the Glass Transition Process. ACTA ACUST UNITED AC 1996. [DOI: 10.1021/jp953596z] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- S. S. N. Murthy
- School of Physical Sciences, Jawaharlal Nehru University, New Delhi 110 067, India
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Murthy SSN, Paikaray A, Arya N. Molecular relaxation and excess entropy in liquids and their connection to the structure of glass. J Chem Phys 1995. [DOI: 10.1063/1.469232] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Murthy SSN, Sobhanadri J, Gangasharan, Sobhanadri J. The origin of β relaxation in organic glasses. J Chem Phys 1994. [DOI: 10.1063/1.466292] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Gangasharan, Murthy SSN. Study of α‐, β‐, and γ‐relaxation processes in some supercooled liquids and supercooled plastic crystals. J Chem Phys 1993. [DOI: 10.1063/1.465470] [Citation(s) in RCA: 55] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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