1
|
Kölbel J, Anuschek ML, Stelzl I, Santitewagun S, Friess W, Zeitler JA. Dynamical Transition in Dehydrated Proteins. J Phys Chem Lett 2024; 15:3581-3590. [PMID: 38527099 PMCID: PMC11000241 DOI: 10.1021/acs.jpclett.3c03584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Revised: 03/16/2024] [Accepted: 03/19/2024] [Indexed: 03/27/2024]
Abstract
Terahertz time-domain spectroscopy and differential scanning calorimetry were used to study the role of the dynamics of biomolecules decoupled from solvent effects. Lyophilized sucrose exhibited steadily increasing absorption with temperature as anharmonic excitations commenced as the system emerged from a deep minimum of the potential energy landscape where harmonic vibrations dominate. The polypeptide bacitracin and two globular proteins, lysozyme and human serum albumin, showed a more complex temperature dependence. Further analysis focused on the spectral signature below and above the boson peak. We found evidence of the onset of anharmonic motions that are characteristic for partial unfolding and molecular jamming in the dry biomolecules. The activation of modes of the protein molecules at temperatures comparable to the protein dynamical transition temperature was observed in the absence of hydration. No evidence of Fröhlich coherence, postulated to facilitate biological function, was found in our experiments.
Collapse
Affiliation(s)
- Johanna Kölbel
- Department
of Chemical Engineering, University of Cambridge, Cambridge CB3 0AS, U.K.
| | - Moritz L. Anuschek
- Department
of Chemical Engineering, University of Cambridge, Cambridge CB3 0AS, U.K.
- Department
of Pharmacy - Center for Drug Research, Pharmaceutical Technology
and Biopharmaceutics, Ludwig-Maximilians
Universität, Butenandtstrasse
5, 81377 Munich, Germany
| | - Ivonne Stelzl
- Department
of Pharmacy - Center for Drug Research, Pharmaceutical Technology
and Biopharmaceutics, Ludwig-Maximilians
Universität, Butenandtstrasse
5, 81377 Munich, Germany
| | - Supawan Santitewagun
- Department
of Chemical Engineering, University of Cambridge, Cambridge CB3 0AS, U.K.
| | - Wolfgang Friess
- Department
of Pharmacy - Center for Drug Research, Pharmaceutical Technology
and Biopharmaceutics, Ludwig-Maximilians
Universität, Butenandtstrasse
5, 81377 Munich, Germany
| | - J. Axel Zeitler
- Department
of Chemical Engineering, University of Cambridge, Cambridge CB3 0AS, U.K.
| |
Collapse
|
2
|
Heczko D, Tarnacka M, Kamiński K, Paluch M, Kamińska E. Breakdown of isochronal superpositioning of α- and β-relaxation times in the van der Waals system – loratadine. J Mol Liq 2023. [DOI: 10.1016/j.molliq.2023.121377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
|
3
|
Ngai KL. Microscopic understanding of the Johari-Goldstein β relaxation gained from nuclear γ-resonance time-domain-interferometry experiments. Phys Rev E 2021; 104:015103. [PMID: 34412284 DOI: 10.1103/physreve.104.015103] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Accepted: 06/07/2021] [Indexed: 11/07/2022]
Abstract
Traditionally the study of dynamics of glass-forming materials has been focused on the structural α relaxation. However, in recent years experimental evidence has revealed that a secondary β relaxation belonging to a special class, called the Johari-Goldstein (JG) β relaxation, has properties strongly linked to the primary α relaxation. By invoking the principle of causality, the relation implies the JG β relaxation is fundamental and indispensable for generating the α relaxation, and the properties of the latter are inherited from the former. The JG β relaxation is observed together with the α relaxation mostly by dielectric spectroscopy. The macroscopic nature of the data allows the use of arbitrary or unproven procedures to analyze the data. Thus the results characterizing the JG β relaxation and the relation of its relaxation time τ_{β} to the α-relaxation time τ_{α} obtained can be equivocal and controversial. Coming to the rescue is the nuclear resonance time-domain-interferometry (TDI) technique covering a wide time range (10^{-9}-10^{-5}s) and a scattering vector q range (9.6-40nm^{-1}). TDI experiments have been carried out on four glass formers, ortho-terphenyl [M. Saito et al., Phys. Rev. Lett. 109, 115705 (2012)10.1103/PhysRevLett.109.115705], polybutadiene [T. Kanaya et al., J. Chem. Phys. 140, 144906 (2014)10.1063/1.4869541], 5-methyl-2-hexanol [F. Caporaletti et al., Sci. Rep. 9, 14319 (2019)10.1038/s41598-019-50824-7], and 1-propanol [F. Caporaletti et al., Nat. Commun. 12, 1867 (2021)10.1038/s41467-021-22154-8]. In this paper the TDI data are reexamined in conjunction with dielectric and neutron scattering data. The results show the JG β relaxation observed by dielectric spectroscopy is heterogeneous and comprises processes with different length scales. A process with a longer length scale has a longer relaxation time. TDI data also prove the primitive relaxation time τ_{0} of the coupling model falls within the distribution of the TDI q-dependent JG β-relaxation times. This important finding explains why the experimental dielectric JG β-relaxation times τ_{β}(T,P) is approximately equal to τ_{0}(T,P) as found in many glass formers at various temperature T and pressure P. The result, τ_{β}(T,P)≈τ_{0}(T,P), in turn explains why the ratio τ_{α}(T,P)/τ_{β}(T,P) is invariant to changes of T and pressure P at constant τ_{α}(T,P), the α-relaxation time.
Collapse
Affiliation(s)
- K L Ngai
- CNR-IPCF, Largo B. Pontecorvo 3, I-56127 Pisa, Italy
| |
Collapse
|
4
|
Hamachi T, Nishimura K, Kouno H, Kawashima Y, Tateishi K, Uesaka T, Kimizuka N, Yanai N. Porphyrins as Versatile, Aggregation-Tolerant, and Biocompatible Polarizing Agents for Triplet Dynamic Nuclear Polarization of Biomolecules. J Phys Chem Lett 2021; 12:2645-2650. [PMID: 33689350 DOI: 10.1021/acs.jpclett.1c00294] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Triplet dynamic nuclear polarization (triplet-DNP) achieves nuclear spin polarization at moderate temperatures by using spin polarization of photoexcited triplet electrons. The applications of triplet-DNP for biomolecules have been hampered because acenes, the only polarizing agents used so far, tend to aggregate and lose their polarization in biomolecular matrices. Here, we report for the first time use of porphyrins as polarizing agents of triplet-DNP and propose a new concept of aggregation-tolerant polarizing agents. Sodium salts of tetrakis(4-carboxyphenyl)porphyrin (TCPPNa) can be dispersed in amorphous as well as crystalline biomolecular matrices, and importantly, it can generate polarized triplet electrons even in a slightly aggregated state. Triplet-DNP of crystalline erythritol containing slightly aggregated TCPPNa can achieve more than 120-fold signal enhancement. Because TCPPNa is also the first biocompatible triplet-DNP polarizing agent, this work provides a crucial step forward for the biological and medical applications of triplet-DNP.
Collapse
Affiliation(s)
- Tomoyuki Hamachi
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Koki Nishimura
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Hironori Kouno
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Yusuke Kawashima
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Kenichiro Tateishi
- Cluster for Pioneering Research, RIKEN, RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Tomohiro Uesaka
- Cluster for Pioneering Research, RIKEN, RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Nobuo Kimizuka
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Nobuhiro Yanai
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
- JST-PRESTO, Honcho 4-1-8, Kawaguchi, Saitama 332-0012, Japan
| |
Collapse
|
5
|
Correlation between molecular dynamics and physical stability of two milled anhydrous sugars: Lactose and sucrose. Int J Pharm 2018; 551:184-194. [PMID: 30223078 DOI: 10.1016/j.ijpharm.2018.09.027] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2018] [Revised: 09/12/2018] [Accepted: 09/12/2018] [Indexed: 11/24/2022]
Abstract
The process of milling often results in amorphization and the physical stability of amorphous phase is linked with its molecular dynamics. This study focuses on a propensity of two disaccharides (lactose and sucrose) to amorphize on ball milling and the stability of the resultant amorphous phase. The amorphous content in milled sugars is estimated by Differential Scanning Calorimetry (DSC) and the stability was measured in terms of the tendency to recrystallize by Broadband Dielectric Spectroscopy (BDS). The results show that the amorphous content increases with milling time and is greater for lactose than sucrose. At the same degree of amorphization, sucrose recrystallize at temperature ∼15 °C higher than lactose, indicating higher stability. The molecular dynamics (beta relaxation process), suggest that milled sucrose is more stable with higher activation energy (∼9 kJ mol-1) than that of lactose. The moisture content of amorphous phase also impacts its molecular dynamics in terms of increase in activation energy as the moisture decrease with increasing the milling times. The study suggests a greater stability of amorphous sucrose and susceptibility of milled lactose to recrystallize, however, on extended milling when the moisture content decreases, lactose was seen to become relatively more stable.
Collapse
|
6
|
Moura Ramos JJ, Viciosa MT, Diogo HP. Thermal behaviour of two anti-inflammatory drugs (celecoxib and rofecoxib) and slow relaxation dynamics in their amorphous solid state. Comparison between the dynamic fragility obtained by dielectric spectroscopy and by thermostimulated currents. Mol Phys 2018. [DOI: 10.1080/00268976.2018.1533146] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Joaquim J. Moura Ramos
- CQE – Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
- CQFM – Centro de Química-Física Molecular, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
| | - M. Teresa Viciosa
- CQE – Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
- CQFM – Centro de Química-Física Molecular, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
| | - Hermínio P. Diogo
- CQE – Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
| |
Collapse
|
7
|
Unexpected Crossover in the kinetics of mutarotation in the supercooled region: the role of H-bonds. Sci Rep 2018; 8:5312. [PMID: 29593302 PMCID: PMC5871794 DOI: 10.1038/s41598-018-23117-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Accepted: 02/26/2018] [Indexed: 12/01/2022] Open
Abstract
Intra- and intermolecular studies on the molten L-sorbose have been carried out at variable temperature conditions to determine the crosover temperature (Tc). In addition, isothermal time-dependent FTIR and Raman measurements were performed to probe the pace of mutarotation and activation energy of this reaction in the studied saccharide, which varied from 53–62 kJ/mol up to 177–192 kJ/mol below and above Tc, respectively. To explain the change in activation barrier for the mutarotation a complementary analysis using difference FTIR spectra collected around Tc = 365 K in the hydroxyl region has been done. It was found that the alteration of kinetic parameters and molecular dynamics around Tc are strictly related to the variation in the strength of H-bonds which above Tc are significantly weaken, increasing the freedom of rotation of functional groups and movement of individual molecules. That phenomenon most likely affects the proton transfer, underlying molecular mechanism of mutarotation, which may lead to the significant increase in activation barrier. The new insight into a molecular aspect of the mutarotation around Tc has created an opportunity to better understanding the relationship between physics of condensed matter and the potential role of H-bonds dynamics on the progress of the chemical reaction in highly viscous systems.
Collapse
|
8
|
Minecka A, Kamińska E, Tarnacka M, Dzienia A, Madejczyk O, Waliłko P, Kasprzycka A, Kamiński K, Paluch M. High pressure studies on structural and secondary relaxation dynamics in silyl derivative of D-glucose. J Chem Phys 2017; 147:064502. [DOI: 10.1063/1.4989679] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
|
9
|
Madejczyk O, Kaminski K, Kaminska E, Jurkiewicz K, Tarnacka M, Burian A, Paluch M. Interplay between the static ordering and dynamical heterogeneities determining the dynamics of rotation and ordinary liquid phases in 1,6-anhydro-β-D-glucose. Sci Rep 2017; 7:42103. [PMID: 28165065 PMCID: PMC5292709 DOI: 10.1038/srep42103] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Accepted: 01/05/2017] [Indexed: 01/02/2023] Open
Abstract
In this letter, we reported thorough the structural and molecular dynamics studies on 1,6-anhydro-β-D-glucose, the second compound reported so far that is capable to form rotator and supercooled liquid phases. In contrast to the data presented for ethanol, temperature dependences of structural dynamics in both phases are very comparable. On the other hand, X ray measurements revealed unusually long range ordering/correlations between molecules in the ODIC (d ≈ 95 Å) and supercooled phases (d ≈ 30-40 Å) of this carbohydrate. Our consideration clearly demonstrated that the interplay between length scales of static range ordering and dynamical heterogeneities as well as internal molecular arrangement seem to be the key to understanding the molecular dynamics of different materials characterized by varying degree of disorder in the vicinity of the glass transition temperature.
Collapse
Affiliation(s)
- O. Madejczyk
- Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland
- Silesian Center for Education and Interdisciplinary Research, University of Silesia, ul. 75 Pulku Piechoty 1A, 41-500 Chorzow, Poland
| | - K. Kaminski
- Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland
- Silesian Center for Education and Interdisciplinary Research, University of Silesia, ul. 75 Pulku Piechoty 1A, 41-500 Chorzow, Poland
| | - E. Kaminska
- Department of Pharmacognosy and Phytochemistry, Medical University of Silesia in Katowice, School of Pharmacy with the Division of Laboratory Medicine in Sosnowiec, ul. Jagiellonska 4, 41-200 Sosnowiec, Poland
| | - K. Jurkiewicz
- Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland
- Silesian Center for Education and Interdisciplinary Research, University of Silesia, ul. 75 Pulku Piechoty 1A, 41-500 Chorzow, Poland
| | - M. Tarnacka
- Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland
- Silesian Center for Education and Interdisciplinary Research, University of Silesia, ul. 75 Pulku Piechoty 1A, 41-500 Chorzow, Poland
| | - A. Burian
- Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland
- Silesian Center for Education and Interdisciplinary Research, University of Silesia, ul. 75 Pulku Piechoty 1A, 41-500 Chorzow, Poland
| | - M. Paluch
- Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland
- Silesian Center for Education and Interdisciplinary Research, University of Silesia, ul. 75 Pulku Piechoty 1A, 41-500 Chorzow, Poland
| |
Collapse
|
10
|
Kaminska E, Tarnacka M, Jurkiewicz K, Kaminski K, Paluch M. High pressure dielectric studies on the structural and orientational glass. J Chem Phys 2016; 144:054503. [PMID: 26851927 DOI: 10.1063/1.4940776] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
High pressure dielectric studies on the H-bonded liquid D-glucose and Orientationally Disordered Crystal (ODIC) 1,6-anhydro-D-glucose (levoglucosan) were carried out. It was shown that in both compounds, the structural relaxation is weakly sensitive to compression. It is well reflected in the low pressure coefficient of the glass transition and orientational glass transition temperatures which is equal to 60 K/GPa for both D-glucose and 1,6-anhydro-D-glucose. Although it should be noted that ∂Tg(0)/∂p evaluated for the latter compound seems to be enormously high with respect to other systems forming ODIC phase. We also found that the shape of the α-loss peak stays constant for the given relaxation time independently on the thermodynamic condition. Consequently, the Time Temperature Pressure (TTP) rule is satisfied. This experimental finding seems to be quite intriguing since the TTP rule was shown to work well in the van der Waals liquids, while in the strongly associating compounds, it is very often violated. We have also demonstrated that the sensitivity of the structural relaxation process to the temperature change measured by the steepness index (mp) drops with pressure. Interestingly, this change is much more significant in the case of D-glucose with respect to levoglucosan, where the fragility changes only slightly with compression. Finally, kinetics of ODIC-crystal phase transition was studied at high compression. It is worth mentioning that in the recent paper, Tombari and Johari [J. Chem. Phys. 142, 104501 (2015)] have shown that ODIC phase in 1,6-anhydro-D-glucose is stable in the wide range of temperatures and there is no tendency to form more ordered phase at ambient pressure. On the other hand, our isochronal measurements performed at varying thermodynamic conditions indicated unquestionably that the application of pressure favors solid (ODIC)-solid (crystal) transition in 1,6-anhydro-D-glucose. This result mimics the impact of pressure on the crystallization of fully disordered supercooled van der Waals liquids.
Collapse
Affiliation(s)
- E Kaminska
- Department of Pharmacognosy and Phytochemistry, School of Pharmacy with the Division of Laboratory Medicine in Sosnowiec, Medical University of Silesia in Katowice, ul. Jagiellonska 4, 41-200 Sosnowiec, Poland
| | - M Tarnacka
- Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland
| | - K Jurkiewicz
- Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland
| | - K Kaminski
- 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
| |
Collapse
|
11
|
Wojnarowska Z, Rams-Baron M, Knapik J, Ngai KL, Kruk D, Paluch M. Dynamic Properties of Glass-Formers Governed by the Frequency Dispersion of the Structural α-Relaxation: Examples from Prilocaine. J Phys Chem B 2015; 119:12699-707. [DOI: 10.1021/acs.jpcb.5b06426] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Z. Wojnarowska
- Institute
of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland
- Silesian Center for Education and Interdisciplinary Research, 75 Pulku Piechoty 1A, 41-500 Chorzow, Poland
| | - M. Rams-Baron
- Institute
of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland
- Silesian Center for Education and Interdisciplinary Research, 75 Pulku Piechoty 1A, 41-500 Chorzow, Poland
| | - J. Knapik
- Institute
of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland
- Silesian Center for Education and Interdisciplinary Research, 75 Pulku Piechoty 1A, 41-500 Chorzow, Poland
| | - K. L. Ngai
- CNR-IPCF, Largo B. Pontecorvo
3, I-56127 Pisa, Italy
- Dipartimento
di Fisica, Università di Pisa, Largo B. Pontecorvo 3, I-56127 Pisa, Italy
| | - D. Kruk
- Faculty
of Mathematics and Computer Science, University of Warmia and Mazury in Olsztyn, Sloneczna 54, Olsztyn PL-10710, Poland
| | - M. Paluch
- Institute
of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland
- Silesian Center for Education and Interdisciplinary Research, 75 Pulku Piechoty 1A, 41-500 Chorzow, Poland
| |
Collapse
|
12
|
Mora E, Diogo HP, Moura Ramos JJ. The Slow Molecular Mobility in Amorphous Ketoprofen and Ibuprofen. J Pharm Sci 2015; 104:3833-3841. [PMID: 26227966 DOI: 10.1002/jps.24591] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Revised: 06/15/2015] [Accepted: 07/01/2015] [Indexed: 11/11/2022]
Abstract
The slow molecular dynamics in two active pharmaceutical drugs, ketoprofen and ibuprofen, have been studied by differential scanning calorimetry (DSC) and thermally stimulated depolarization currents (TSDC). This study allowed finding the main kinetic features of the fast secondary (γ) relaxation, of the Johari-Goldstein relaxation, and of the main (glass transition) relaxation, in particular their distribution of relaxation times. The fragility index of the two glass formers was determined based on data from DSC and from TSDC. The obtained results were compared with those obtained by other experimental techniques, namely, dielectric relaxation spectroscopy.
Collapse
Affiliation(s)
- Elsa Mora
- CQE - Centro de Química Estrutural, Complexo I, IST, Universidade de Lisboa, Lisbon 1049-001, Portugal
| | - Hermínio P Diogo
- CQE - Centro de Química Estrutural, Complexo I, IST, Universidade de Lisboa, Lisbon 1049-001, Portugal.
| | - Joaquim J Moura Ramos
- CQFM - Centro de Química-Física Molecular and IN - Institute of Nanoscience and Nanotechnology, Instituto Superior Técnico, Universidade de Lisboa, Lisbon 1049-001, Portugal.
| |
Collapse
|
13
|
Yamamoto W, Sasaki K, Kita R, Yagihara S, Shinyashiki N. Dielectric study on temperature–concentration superposition of liquid to glass in fructose–water mixtures. J Mol Liq 2015. [DOI: 10.1016/j.molliq.2015.01.057] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
14
|
Tripathy SN, Wojnarowska Z, Knapik J, Shirota H, Biswas R, Paluch M. Glass transition dynamics and conductivity scaling in ionic deep eutectic solvents: The case of (acetamide + lithium nitrate/sodium thiocyanate) melts. J Chem Phys 2015; 142:184504. [DOI: 10.1063/1.4919946] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Satya N. Tripathy
- Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland
- Silesian Center for Education and Interdisciplinary Research, 75 Pulku Piechoty 1A, 41-500 Chorzow, Poland
| | - Zaneta Wojnarowska
- Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland
- Silesian Center for Education and Interdisciplinary Research, 75 Pulku Piechoty 1A, 41-500 Chorzow, Poland
| | - Justyna Knapik
- Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland
- Silesian Center for Education and Interdisciplinary Research, 75 Pulku Piechoty 1A, 41-500 Chorzow, Poland
| | - Hideaki Shirota
- Department of Nanomaterial Science and Department of Chemistry, Chiba University, 1-33 Yayoi, Inage-ku, Chiba 263-8522, Japan
| | - Ranjit Biswas
- Department of Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700098, India
| | - Marian Paluch
- Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland
- Silesian Center for Education and Interdisciplinary Research, 75 Pulku Piechoty 1A, 41-500 Chorzow, Poland
| |
Collapse
|
15
|
Kaminska E, Tarnacka M, Kolodziejczyk K, Dulski M, Zakowiecki D, Hawelek L, Adrjanowicz K, Zych M, Garbacz G, Kaminski K. Impact of low molecular weight excipient octaacetylmaltose on the liquid crystalline ordering and molecular dynamics in the supercooled liquid and glassy state of itraconazole. Eur J Pharm Biopharm 2014; 88:1094-104. [DOI: 10.1016/j.ejpb.2014.10.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2014] [Revised: 10/09/2014] [Accepted: 10/12/2014] [Indexed: 10/24/2022]
|
16
|
Bhattacharya S, Bhardwaj SP, Suryanarayanan R. Molecular Motions in Sucrose-PVP and Sucrose-Sorbitol Dispersions—II. Implications of Annealing on Secondary Relaxations. Pharm Res 2014; 31:2822-8. [DOI: 10.1007/s11095-014-1379-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2013] [Accepted: 04/07/2014] [Indexed: 11/29/2022]
|
17
|
Zhang H, Douglas JF. Glassy Interfacial Dynamics of Ni Nanoparticles: Part II Discrete Breathers as an Explanation of Two-Level Energy Fluctuations. SOFT MATTER 2013; 9:1266-1280. [PMID: 23585770 PMCID: PMC3622713 DOI: 10.1039/c2sm27533c] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Recent studies of the dynamics of diverse condensed amorphous materials have indicated significant heterogeneity in the local mobility and a progressive increase in collective particle motion upon cooling that takes the form of string-like particle rearrangements. In a previous paper (Part I), we examined the possibility that fluctuations in potential energy E and particle mobility μ associated with this 'dynamic heterogeneity' might offer information about the scale of collective motion in glassy materials based on molecular dynamics simulations of the glassy interfacial region of Ni nanoparticles (NPs) at elevated temperatures. We found that the noise exponent associated with fluctuations in the Debye-Waller factor, a mobility related quantity, was directly proportional to the scale of collective motion L under a broad range of conditions, but the noise exponent associated with E(t) fluctuations was seemingly unrelated to L. In the present work, we focus on this unanticipated difference between potential energy and mobility fluctuations by examining these quantities at an atomic scale. We find that the string atoms exhibit a jump-like motion between two well-separated bands of energy states and the rate at which these jumps occur seems to be consistent with the phenomenology of the 'slow-beta' relaxation process of glass-forming liquids. Concurrently with these local E(t) jumps, we also find 'quake-like' particle displacements having a power-law distribution in magnitude so that particle displacement fluctuations within the strings are strikingly different from local E(t) fluctuations. An analysis of these E(t) fluctuations suggests that we are dealing with 'discrete breather' excitations in which large energy fluctuations develop in arrays of non-linear oscillators by virtue of large anharmonicity in the interparticle interactions and discreteness effects associated with particle packing. We quantify string collective motions on a fast caging times scale (picoseconds) and explore the significance of these collective motions for understanding the Boson peak of glass-forming materials.
Collapse
Affiliation(s)
- Hao Zhang
- Department of Chemical and Materials Engineering, University of Alberta, AB T6G 2V4 Canada
| | - Jack F. Douglas
- Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, Maryland, 20899 USA
| |
Collapse
|
18
|
Kossack W, Adrjanowicz K, Tarnacka M, Kiprop Kipnusu W, Dulski M, Mapesa EU, Kaminski K, Pawlus S, Paluch M, Kremer F. Glassy dynamics and physical aging in fucose saccharides as studied by infrared- and broadband dielectric spectroscopy. Phys Chem Chem Phys 2013; 15:20641-50. [DOI: 10.1039/c3cp52551a] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
|
19
|
Liang J, Ludescher RD. Influence of glycerol on molecular mobility and hydrogen bond network in amorphous glucose matrix. Carbohydr Res 2012; 361:120-6. [DOI: 10.1016/j.carres.2012.08.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2012] [Revised: 08/24/2012] [Accepted: 08/25/2012] [Indexed: 11/15/2022]
|
20
|
Kaminski K, Adrjanowicz K, Zakowiecki D, Kaminska E, Wlodarczyk P, Paluch M, Pilch J, Tarnacka M. Dielectric Studies on Molecular Dynamics of Two Important Disaccharides: Sucrose and Trehalose. Mol Pharm 2012; 9:1559-69. [DOI: 10.1021/mp2004498] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- K. Kaminski
- Institute of Physics, University
of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland
| | - K. Adrjanowicz
- Institute of Physics, University
of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland
| | - D. Zakowiecki
- Preformulation Department R&D, Pharmaceutical Works Polpharma SA, Pelplinska 19, 83-200 Starogard Gdanski, Poland
| | - E. Kaminska
- Department
of Pharmacognosy and
Phytochemistry, Medical University of Silesia, ul. Jagiellonska 4,
41-200 Sosnowiec, Poland
| | - P. Wlodarczyk
- 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
| | - J. Pilch
- Department of Biological Sciences
Academy of Physical Education, Raciborska 1, 40-074 Katowice, Poland
| | - M. Tarnacka
- Institute of Physics, University
of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland
| |
Collapse
|
21
|
Wojnarowska Z, Swiety-Pospiech A, Grzybowska K, Hawelek L, Paluch M, Ngai KL. Fundamentals of ionic conductivity relaxation gained from study of procaine hydrochloride and procainamide hydrochloride at ambient and elevated pressure. J Chem Phys 2012; 136:164507. [DOI: 10.1063/1.4705274] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
|
22
|
Wojnarowska Z, Grzybowska K, Hawelek L, Swiety-Pospiech A, Masiewicz E, Paluch M, Sawicki W, Chmielewska A, Bujak P, Markowski J. Molecular dynamics studies on the water mixtures of pharmaceutically important ionic liquid lidocaine HCl. Mol Pharm 2012; 9:1250-61. [PMID: 22424553 DOI: 10.1021/mp2005609] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In this paper the molecular dynamics of a common local-anesthetic drug, lidocaine hydrochloride (LD-HCl), and its water mixtures were investigated. By means of broadband dielectric spectroscopy and calorimetric measurements it was shown that even a small addition of water causes a significant effect on the relaxation dynamics of analyzed protic ionic liquid. Apart from the two well-resolved relaxations (σ- and γ-processes) and the β-mode, identified as the JG-process, observed for anhydrous LD-HCl, a new relaxation peak (υ) is visible in the dielectric spectra of aqueous mixtures of this drug. Additionally, the significant effect of the water on the glass transition temperature of LD-HCl was found. The sample characterized with mole fraction of water X(w) = 0.44 reveals the glass transition temperature T(g), 42 K lower than that of anhydrous material (307 K). Finally, it was shown that by amorphization of the hydrochloride salt of lidocaine it is possible to obtain its room temperature ionic liquid form.
Collapse
Affiliation(s)
- Z Wojnarowska
- Institute of Physics, University of Silesia, ul Uniwersytecka 4, 40-007 Katowice, Poland.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
23
|
Capaccioli S, Ngai KL, Ancherbak S, Paciaroni A. Evidence of Coexistence of Change of Caged Dynamics at Tg and the Dynamic Transition at Td in Solvated Proteins. J Phys Chem B 2012; 116:1745-57. [DOI: 10.1021/jp2057892] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- S. Capaccioli
- CNR-IPCF, Consiglio Nazionale delle Ricerche, Istituto per i Processi Chimico-Fisici,
c/o Dipartimento di Fisica, Largo Bruno Pontecorvo 3, I-56127 Pisa,
Italy
- Dipartimento di Fisica, Università di Pisa, Largo Bruno Pontecorvo 3,
I-56127 Pisa, Italy
| | - K. L. Ngai
- CNR-IPCF, Consiglio Nazionale delle Ricerche, Istituto per i Processi Chimico-Fisici,
c/o Dipartimento di Fisica, Largo Bruno Pontecorvo 3, I-56127 Pisa,
Italy
| | - S. Ancherbak
- Dipartimento di Fisica, Università di Pisa, Largo Bruno Pontecorvo 3,
I-56127 Pisa, Italy
| | - A. Paciaroni
- Dipartimento di Fisica, Università di Perugia & IOM-CNR, Via A. Pascoli 1, 06123 Perugia, Italy
| |
Collapse
|
24
|
Pagnotta SE, Alegría A, Colmenero J. Dynamical behavior of highly concentrated trehalose water solutions: a dielectric spectroscopy study. Phys Chem Chem Phys 2012; 14:2991-6. [DOI: 10.1039/c2cp22402j] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
25
|
Hensel-Bielowka S, Wlodarczyk P, Mierzwa M, Paluch M, Ngai KL. Dynamics of α-Tetralone at Elevated Pressure and in Mixture with Oligostyrene. J Phys Chem B 2011; 116:22-9. [DOI: 10.1021/jp207071y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | - Patryk Wlodarczyk
- Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland, and
| | - Michal Mierzwa
- Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland, and
| | - Marian Paluch
- Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland, and
| | - Kia L. Ngai
- CNR-IPCF, Dipartimento di Fisica, Università di Pisa, Largo Bruno Pontecorvo 3, I-56127, Pisa, Italy
| |
Collapse
|
26
|
Broadband dielectric spectroscopy and calorimetric investigations of d-lyxose. Carbohydr Res 2011; 346:2165-72. [DOI: 10.1016/j.carres.2011.06.029] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2011] [Revised: 06/16/2011] [Accepted: 06/21/2011] [Indexed: 11/24/2022]
|
27
|
Bhattacharya S, Suryanarayanan R. Molecular Motions in Sucrose-PVP and Sucrose-Sorbitol Dispersions: I. Implications of Global and Local Mobility on Stability. Pharm Res 2011; 28:2191-203. [DOI: 10.1007/s11095-011-0447-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2010] [Accepted: 04/05/2011] [Indexed: 11/29/2022]
|
28
|
Kwon HJ, Seo JA, Kim HK, Hwang YH. Study of dielectric relaxations of anhydrous trehalose and maltose glasses. J Chem Phys 2011; 134:014508. [DOI: 10.1063/1.3517217] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
29
|
Kaminski K, Wlodarczyk P, Adrjanowicz K, Kaminska E, Wojnarowska Z, Paluch M. Origin of the Commonly Observed Secondary Relaxation Process in Saccharides. J Phys Chem B 2010; 114:11272-81. [DOI: 10.1021/jp1034773] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- K. Kaminski
- Institute of Physics, Silesian University, ul. Uniwersytecka 4, 40-007 Katowice, Poland
| | - P. Wlodarczyk
- Institute of Physics, Silesian University, ul. Uniwersytecka 4, 40-007 Katowice, Poland
| | - K. Adrjanowicz
- Institute of Physics, Silesian University, ul. Uniwersytecka 4, 40-007 Katowice, Poland
| | - E. Kaminska
- Institute of Physics, Silesian University, ul. Uniwersytecka 4, 40-007 Katowice, Poland
| | - Z. Wojnarowska
- Institute of Physics, Silesian University, ul. Uniwersytecka 4, 40-007 Katowice, Poland
| | - M. Paluch
- Institute of Physics, Silesian University, ul. Uniwersytecka 4, 40-007 Katowice, Poland
| |
Collapse
|
30
|
Sousa M, Brás AR, Veiga HIM, Ferreira FC, de Pinho MN, Correia NT, Dionísio M. Dynamical Characterization of a Cellulose Acetate Polysaccharide. J Phys Chem B 2010; 114:10939-53. [DOI: 10.1021/jp101665h] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Miriam Sousa
- REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal, Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, Av. República, Apart. 127, 2780-901 Oeiras, Portugal, IBB-Institute for Biotechnology and Bioengineering, Centre for Biological and Chemical Engineering, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal, and Universidade Técnica de Lisboa, Instituto Superior Técnico, ICEMS/DQEB,
| | - Ana Rita Brás
- REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal, Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, Av. República, Apart. 127, 2780-901 Oeiras, Portugal, IBB-Institute for Biotechnology and Bioengineering, Centre for Biological and Chemical Engineering, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal, and Universidade Técnica de Lisboa, Instituto Superior Técnico, ICEMS/DQEB,
| | - Helena Isabel M. Veiga
- REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal, Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, Av. República, Apart. 127, 2780-901 Oeiras, Portugal, IBB-Institute for Biotechnology and Bioengineering, Centre for Biological and Chemical Engineering, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal, and Universidade Técnica de Lisboa, Instituto Superior Técnico, ICEMS/DQEB,
| | - Frederico Castelo Ferreira
- REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal, Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, Av. República, Apart. 127, 2780-901 Oeiras, Portugal, IBB-Institute for Biotechnology and Bioengineering, Centre for Biological and Chemical Engineering, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal, and Universidade Técnica de Lisboa, Instituto Superior Técnico, ICEMS/DQEB,
| | - Maria Norberta de Pinho
- REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal, Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, Av. República, Apart. 127, 2780-901 Oeiras, Portugal, IBB-Institute for Biotechnology and Bioengineering, Centre for Biological and Chemical Engineering, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal, and Universidade Técnica de Lisboa, Instituto Superior Técnico, ICEMS/DQEB,
| | - Natália T. Correia
- REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal, Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, Av. República, Apart. 127, 2780-901 Oeiras, Portugal, IBB-Institute for Biotechnology and Bioengineering, Centre for Biological and Chemical Engineering, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal, and Universidade Técnica de Lisboa, Instituto Superior Técnico, ICEMS/DQEB,
| | - Madalena Dionísio
- REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal, Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, Av. República, Apart. 127, 2780-901 Oeiras, Portugal, IBB-Institute for Biotechnology and Bioengineering, Centre for Biological and Chemical Engineering, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal, and Universidade Técnica de Lisboa, Instituto Superior Técnico, ICEMS/DQEB,
| |
Collapse
|
31
|
Kaminski K, Kaminska E, Adrjanowicz K, Wojnarowska Z, Wlodarczyk P, Grzybowska K, Dulski M, Wrzalik R, Paluch M. Observation of the dynamics of clusters in d-glucose with the use of dielectric spectroscopy. Phys Chem Chem Phys 2010; 12:723-30. [DOI: 10.1039/b916699h] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
32
|
Transformation of the Strongly Hydrogen Bonded System into van der Waals one Reflected in Molecular Dynamics. ACTA ACUST UNITED AC 2010. [DOI: 10.1007/978-90-481-3408-3_26] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2023]
|
33
|
Kaminski K, Kaminska E, Ngai KL, Paluch M, Wlodarczyk P, Kasprzycka A, Szeja W. Identifying the origins of two secondary relaxations in polysaccharides. J Phys Chem B 2009; 113:10088-96. [PMID: 19572673 DOI: 10.1021/jp809760t] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The main goal of this paper is to identify the molecular origins of two secondary relaxations observed in mechanical as well as in dielectric spectra in polysaccharides, including cellulose, and starches, such as pullulan and dextran. This issue has been actively pursued by many research groups, but consensus has not been reached. By comparing experimental data of monosaccharides, disaccharides, and polysaccharides, we are able to make conclusions on the origins of two secondary relaxations in polysaccharides. The faster secondary relaxations of polysaccharides are similar to the faster secondary relaxations of mono-, di-, and oligosaccharides. These include comparable relaxation times and activation energies in the glassy states, and also all the faster secondary relaxations have larger dielectric strengths than the slower secondary relaxation. The similarities indicate that the faster secondary relaxations in the polysaccharides have the same origin as that in mono-, di-, and oligosaccharides. Furthermore, since the relaxation time of the faster secondary relaxation in several mono- and disaccharides was found to be insensitive to applied pressure, the faster secondary relaxations of the polysaccharides are identified as internal motions within their monomeric units. The slower secondary relaxations in polysaccharides also have similar characteristics to those of the slower secondary relaxations of the disaccharides (maltose, cellobiose, sucrose, and trehalose), which indicates the analogous motions govern the slower process in these two groups of carbohydrates. Earlier we have shown in disaccharides that the rotation of the monomeric units around the glycosidic bond is responsible for this process. The same motion can occur in polysaccharides in the form of a local chain rotation. These motions involve the whole molecule in disaccharides and a local segment in polysaccharides. It is intermolecular in nature (with relaxation time pressure dependent, as found before in a disaccharide), and hence, it is the precursor of the structural alpha-relaxation. These results lead us to identify the slower secondary relaxation of the polysaccharides as the Johari-Goldstein beta-relaxation, which is supposedly a universal and fundamental process in all glass-forming substances.
Collapse
Affiliation(s)
- K Kaminski
- Institute of Physics, Silesian University, ul. Uniwersytecka 4, 40-007 Katowice, Poland
| | | | | | | | | | | | | |
Collapse
|
34
|
Kaminski K, Kaminska E, Pawlus S, Wlodarczyk P, Paluch M, Ziolo J, Kasprzycka A, Szeja W, Ngai K, Pilch J. Dielectric properties of two diastereoisomers of the arabinose and their equimolar mixture. Carbohydr Res 2009; 344:2547-53. [DOI: 10.1016/j.carres.2009.10.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2009] [Revised: 09/22/2009] [Accepted: 10/02/2009] [Indexed: 11/30/2022]
|
35
|
Correia NT, Diogo HP, Moura Ramos JJ. Slow Molecular Mobility in the Amorphous Solid State of Fructose: Fragility and Aging. J Food Sci 2009; 74:E526-33. [PMID: 20492115 DOI: 10.1111/j.1750-3841.2009.01363.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Natália T Correia
- REQUIMTE, Depart. de Química, Faculdade de Ciências e Tecnologia da Univ. Nova de Lisboa, 2829-516 Caparica, Portugal
| | | | | |
Collapse
|
36
|
Santucci SC, Comez L, Scarponi F, Monaco G, Verbeni R, Legrand JF, Masciovecchio C, Gessini A, Fioretto D. Onset of the α-relaxation in the glass-forming solution LiCl–6H2O revealed by Brillouin scattering techniques. J Chem Phys 2009; 131:154507. [DOI: 10.1063/1.3223537] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
37
|
Wlodarczyk P, Kaminski K, Adrjanowicz K, Wojnarowska Z, Czarnota B, Paluch M, Ziolo J, Pilch J. Identification of the slower secondary relaxation’s nature in maltose by means of theoretical and dielectric studies. J Chem Phys 2009; 131:125103. [DOI: 10.1063/1.3224856] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
38
|
Bhattacharya S, Suryanarayanan R. Local Mobility in Amorphous Pharmaceuticals—Characterization and Implications on Stability. J Pharm Sci 2009; 98:2935-53. [DOI: 10.1002/jps.21728] [Citation(s) in RCA: 175] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
39
|
Tiwari RS, Ludescher RD. Vanillin Phosphorescence as a Probe of Molecular Mobility in Amorphous Sucrose. J Fluoresc 2009; 20:125-33. [DOI: 10.1007/s10895-009-0530-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2009] [Accepted: 08/07/2009] [Indexed: 10/20/2022]
|
40
|
Wlodarczyk P, Kaminski K, Paluch M, Ziolo J. Mutarotation in d-Fructose Melt Monitored by Dielectric Spectroscopy. J Phys Chem B 2009; 113:4379-83. [DOI: 10.1021/jp8095902] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- P. Wlodarczyk
- Institute of Physics, Silesian University, ul. Uniwersytecka 4, 40-007 Katowice, Poland
| | - K. Kaminski
- Institute of Physics, Silesian University, ul. Uniwersytecka 4, 40-007 Katowice, Poland
| | - M. Paluch
- Institute of Physics, Silesian University, ul. Uniwersytecka 4, 40-007 Katowice, Poland
| | - J. Ziolo
- Institute of Physics, Silesian University, ul. Uniwersytecka 4, 40-007 Katowice, Poland
| |
Collapse
|
41
|
Shinyashiki N, Shinohara M, Iwata Y, Goto T, Oyama M, Suzuki S, Yamamoto W, Yagihara S, Inoue T, Oyaizu S, Yamamoto S, Ngai KL, Capaccioli S. The Glass Transition and Dielectric Secondary Relaxation of Fructose−Water Mixtures. J Phys Chem B 2008; 112:15470-7. [DOI: 10.1021/jp807038r] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- N. Shinyashiki
- Department of Physics, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan, Research & Development Division, Nichirei Foods INC, 9, Shinminato, Mihama-ku, Chiba 261-8545, Japan, Naval Research Laboratory, Washington, D.C. 20375-5320, and Dipartimento di Fisica, Università di Pisa and polyLab, CNR-INFM, Largo B. Pontecorvo 3, I-56127 Pisa, Italy
| | - M. Shinohara
- Department of Physics, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan, Research & Development Division, Nichirei Foods INC, 9, Shinminato, Mihama-ku, Chiba 261-8545, Japan, Naval Research Laboratory, Washington, D.C. 20375-5320, and Dipartimento di Fisica, Università di Pisa and polyLab, CNR-INFM, Largo B. Pontecorvo 3, I-56127 Pisa, Italy
| | - Y. Iwata
- Department of Physics, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan, Research & Development Division, Nichirei Foods INC, 9, Shinminato, Mihama-ku, Chiba 261-8545, Japan, Naval Research Laboratory, Washington, D.C. 20375-5320, and Dipartimento di Fisica, Università di Pisa and polyLab, CNR-INFM, Largo B. Pontecorvo 3, I-56127 Pisa, Italy
| | - T. Goto
- Department of Physics, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan, Research & Development Division, Nichirei Foods INC, 9, Shinminato, Mihama-ku, Chiba 261-8545, Japan, Naval Research Laboratory, Washington, D.C. 20375-5320, and Dipartimento di Fisica, Università di Pisa and polyLab, CNR-INFM, Largo B. Pontecorvo 3, I-56127 Pisa, Italy
| | - M. Oyama
- Department of Physics, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan, Research & Development Division, Nichirei Foods INC, 9, Shinminato, Mihama-ku, Chiba 261-8545, Japan, Naval Research Laboratory, Washington, D.C. 20375-5320, and Dipartimento di Fisica, Università di Pisa and polyLab, CNR-INFM, Largo B. Pontecorvo 3, I-56127 Pisa, Italy
| | - S. Suzuki
- Department of Physics, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan, Research & Development Division, Nichirei Foods INC, 9, Shinminato, Mihama-ku, Chiba 261-8545, Japan, Naval Research Laboratory, Washington, D.C. 20375-5320, and Dipartimento di Fisica, Università di Pisa and polyLab, CNR-INFM, Largo B. Pontecorvo 3, I-56127 Pisa, Italy
| | - W. Yamamoto
- Department of Physics, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan, Research & Development Division, Nichirei Foods INC, 9, Shinminato, Mihama-ku, Chiba 261-8545, Japan, Naval Research Laboratory, Washington, D.C. 20375-5320, and Dipartimento di Fisica, Università di Pisa and polyLab, CNR-INFM, Largo B. Pontecorvo 3, I-56127 Pisa, Italy
| | - S. Yagihara
- Department of Physics, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan, Research & Development Division, Nichirei Foods INC, 9, Shinminato, Mihama-ku, Chiba 261-8545, Japan, Naval Research Laboratory, Washington, D.C. 20375-5320, and Dipartimento di Fisica, Università di Pisa and polyLab, CNR-INFM, Largo B. Pontecorvo 3, I-56127 Pisa, Italy
| | - T. Inoue
- Department of Physics, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan, Research & Development Division, Nichirei Foods INC, 9, Shinminato, Mihama-ku, Chiba 261-8545, Japan, Naval Research Laboratory, Washington, D.C. 20375-5320, and Dipartimento di Fisica, Università di Pisa and polyLab, CNR-INFM, Largo B. Pontecorvo 3, I-56127 Pisa, Italy
| | - S. Oyaizu
- Department of Physics, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan, Research & Development Division, Nichirei Foods INC, 9, Shinminato, Mihama-ku, Chiba 261-8545, Japan, Naval Research Laboratory, Washington, D.C. 20375-5320, and Dipartimento di Fisica, Università di Pisa and polyLab, CNR-INFM, Largo B. Pontecorvo 3, I-56127 Pisa, Italy
| | - S. Yamamoto
- Department of Physics, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan, Research & Development Division, Nichirei Foods INC, 9, Shinminato, Mihama-ku, Chiba 261-8545, Japan, Naval Research Laboratory, Washington, D.C. 20375-5320, and Dipartimento di Fisica, Università di Pisa and polyLab, CNR-INFM, Largo B. Pontecorvo 3, I-56127 Pisa, Italy
| | - K. L. Ngai
- Department of Physics, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan, Research & Development Division, Nichirei Foods INC, 9, Shinminato, Mihama-ku, Chiba 261-8545, Japan, Naval Research Laboratory, Washington, D.C. 20375-5320, and Dipartimento di Fisica, Università di Pisa and polyLab, CNR-INFM, Largo B. Pontecorvo 3, I-56127 Pisa, Italy
| | - S. Capaccioli
- Department of Physics, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan, Research & Development Division, Nichirei Foods INC, 9, Shinminato, Mihama-ku, Chiba 261-8545, Japan, Naval Research Laboratory, Washington, D.C. 20375-5320, and Dipartimento di Fisica, Università di Pisa and polyLab, CNR-INFM, Largo B. Pontecorvo 3, I-56127 Pisa, Italy
| |
Collapse
|
42
|
Slow molecular mobility in the crystalline and amorphous solid states of glucose as studied by thermally stimulated depolarization currents (TSDC). Carbohydr Res 2008; 343:2797-803. [DOI: 10.1016/j.carres.2008.07.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2008] [Revised: 06/25/2008] [Accepted: 07/01/2008] [Indexed: 11/23/2022]
|
43
|
Capaccioli S, Thayyil MS, Ngai KL. Critical Issues of Current Research on the Dynamics Leading to Glass Transition. J Phys Chem B 2008; 112:16035-49. [DOI: 10.1021/jp8057433] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- S. Capaccioli
- Dipartimento di Fisica, Università di Pisa and CNR-INFM, polylab, Largo Bruno Pontecorvo, 3, I-56127 Pisa, Italy
| | - M. Shahin Thayyil
- Dipartimento di Fisica, Università di Pisa, Largo Bruno Pontecorvo, 3, I-56127 Pisa, Italy, and Department of Physics, University of Calicut, Kerala, India
| | - K. L. Ngai
- Naval Research Laboratory, Washington, DC 20375-5320
| |
Collapse
|
44
|
Kaminski K, Kaminska E, Wlodarczyk P, Pawlus S, Kimla D, Kasprzycka A, Paluch M, Ziolo J, Szeja W, Ngai KL. Dielectric Studies on Mobility of the Glycosidic Linkage in Seven Disaccharides. J Phys Chem B 2008; 112:12816-23. [DOI: 10.1021/jp804240a] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- K. Kaminski
- Institute of Physics, Silesian Univ., ul. Uniwersytecka 4, 40-007 Katowice, Poland, Silesian University of Technology, Department of Chemistry, Division of Organic, Chemistry, Biochemistry and Biotechnology, ul. Krzywoustego 4, 44-100 Gliwice, Poland, and Naval Research Laboratory, Washington, DC 20375-5320
| | - E. Kaminska
- Institute of Physics, Silesian Univ., ul. Uniwersytecka 4, 40-007 Katowice, Poland, Silesian University of Technology, Department of Chemistry, Division of Organic, Chemistry, Biochemistry and Biotechnology, ul. Krzywoustego 4, 44-100 Gliwice, Poland, and Naval Research Laboratory, Washington, DC 20375-5320
| | - P. Wlodarczyk
- Institute of Physics, Silesian Univ., ul. Uniwersytecka 4, 40-007 Katowice, Poland, Silesian University of Technology, Department of Chemistry, Division of Organic, Chemistry, Biochemistry and Biotechnology, ul. Krzywoustego 4, 44-100 Gliwice, Poland, and Naval Research Laboratory, Washington, DC 20375-5320
| | - S. Pawlus
- Institute of Physics, Silesian Univ., ul. Uniwersytecka 4, 40-007 Katowice, Poland, Silesian University of Technology, Department of Chemistry, Division of Organic, Chemistry, Biochemistry and Biotechnology, ul. Krzywoustego 4, 44-100 Gliwice, Poland, and Naval Research Laboratory, Washington, DC 20375-5320
| | - D. Kimla
- Institute of Physics, Silesian Univ., ul. Uniwersytecka 4, 40-007 Katowice, Poland, Silesian University of Technology, Department of Chemistry, Division of Organic, Chemistry, Biochemistry and Biotechnology, ul. Krzywoustego 4, 44-100 Gliwice, Poland, and Naval Research Laboratory, Washington, DC 20375-5320
| | - A. Kasprzycka
- Institute of Physics, Silesian Univ., ul. Uniwersytecka 4, 40-007 Katowice, Poland, Silesian University of Technology, Department of Chemistry, Division of Organic, Chemistry, Biochemistry and Biotechnology, ul. Krzywoustego 4, 44-100 Gliwice, Poland, and Naval Research Laboratory, Washington, DC 20375-5320
| | - M. Paluch
- Institute of Physics, Silesian Univ., ul. Uniwersytecka 4, 40-007 Katowice, Poland, Silesian University of Technology, Department of Chemistry, Division of Organic, Chemistry, Biochemistry and Biotechnology, ul. Krzywoustego 4, 44-100 Gliwice, Poland, and Naval Research Laboratory, Washington, DC 20375-5320
| | - J. Ziolo
- Institute of Physics, Silesian Univ., ul. Uniwersytecka 4, 40-007 Katowice, Poland, Silesian University of Technology, Department of Chemistry, Division of Organic, Chemistry, Biochemistry and Biotechnology, ul. Krzywoustego 4, 44-100 Gliwice, Poland, and Naval Research Laboratory, Washington, DC 20375-5320
| | - W. Szeja
- Institute of Physics, Silesian Univ., ul. Uniwersytecka 4, 40-007 Katowice, Poland, Silesian University of Technology, Department of Chemistry, Division of Organic, Chemistry, Biochemistry and Biotechnology, ul. Krzywoustego 4, 44-100 Gliwice, Poland, and Naval Research Laboratory, Washington, DC 20375-5320
| | - K. L. Ngai
- Institute of Physics, Silesian Univ., ul. Uniwersytecka 4, 40-007 Katowice, Poland, Silesian University of Technology, Department of Chemistry, Division of Organic, Chemistry, Biochemistry and Biotechnology, ul. Krzywoustego 4, 44-100 Gliwice, Poland, and Naval Research Laboratory, Washington, DC 20375-5320
| |
Collapse
|
45
|
Kaminski K, Kaminska E, Hensel-Bielowka S, Pawlus S, Paluch M, Ziolo J. High pressure study on molecular mobility of leucrose. J Chem Phys 2008; 129:084501. [DOI: 10.1063/1.2969816] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
46
|
Kaminski K, Kaminska E, Hensel-Bielowka S, Chelmecka E, Paluch M, Ziolo J, Wlodarczyk P, Ngai KL. Identification of the Molecular Motions Responsible for the Slower Secondary (β) Relaxation in Sucrose. J Phys Chem B 2008; 112:7662-8. [DOI: 10.1021/jp711502a] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- K. Kaminski
- Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland, Statistical Division, Department of Instrumental Analysis, Medical University of Silesia, ul. Ostrogórska 30, Sosnowiec, Poland, and Naval Research Laboratory, Washington, D.C. 20375-5320
| | - E. Kaminska
- Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland, Statistical Division, Department of Instrumental Analysis, Medical University of Silesia, ul. Ostrogórska 30, Sosnowiec, Poland, and Naval Research Laboratory, Washington, D.C. 20375-5320
| | - S. Hensel-Bielowka
- Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland, Statistical Division, Department of Instrumental Analysis, Medical University of Silesia, ul. Ostrogórska 30, Sosnowiec, Poland, and Naval Research Laboratory, Washington, D.C. 20375-5320
| | - E. Chelmecka
- Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland, Statistical Division, Department of Instrumental Analysis, Medical University of Silesia, ul. Ostrogórska 30, Sosnowiec, Poland, and Naval Research Laboratory, Washington, D.C. 20375-5320
| | - M. Paluch
- Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland, Statistical Division, Department of Instrumental Analysis, Medical University of Silesia, ul. Ostrogórska 30, Sosnowiec, Poland, and Naval Research Laboratory, Washington, D.C. 20375-5320
| | - J. Ziolo
- Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland, Statistical Division, Department of Instrumental Analysis, Medical University of Silesia, ul. Ostrogórska 30, Sosnowiec, Poland, and Naval Research Laboratory, Washington, D.C. 20375-5320
| | - P. Wlodarczyk
- Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland, Statistical Division, Department of Instrumental Analysis, Medical University of Silesia, ul. Ostrogórska 30, Sosnowiec, Poland, and Naval Research Laboratory, Washington, D.C. 20375-5320
| | - K. L. Ngai
- Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland, Statistical Division, Department of Instrumental Analysis, Medical University of Silesia, ul. Ostrogórska 30, Sosnowiec, Poland, and Naval Research Laboratory, Washington, D.C. 20375-5320
| |
Collapse
|
47
|
Kessairi K, Capaccioli S, Prevosto D, Lucchesi M, Rolla P. Relaxation dynamics intert-butylpyridine/tristyrene mixture investigated by broadband dielectric spectroscopy. J Chem Phys 2007; 127:174502. [DOI: 10.1063/1.2784190] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
48
|
Capaccioli S, Ngai KL, Shinyashiki N. The Johari-Goldstein beta-relaxation of water. J Phys Chem B 2007; 111:8197-209. [PMID: 17585798 DOI: 10.1021/jp071857m] [Citation(s) in RCA: 129] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
There is a plethora of experimental data on the dynamics of water in mixtures with glycerol, ethylene glycol, ethylene glycol oligomers, poly(ethylene glycol) 400 and 600, propanol, poly(vinyl pyrrolidone), poly(vinyl methylether), and other substances. In spite of the differences in the water contents, the chemical compositions, and the glass transition temperatures Tg of these aqueous mixtures, a faster relaxation originating from the water (called the nu-process) is omnipresent, sharing the following common properties. The relaxation time tau(nu) has Arrhenius temperature dependence at temperatures below Tg of the mixture. The activation energies of tau(nu) all fall within a neighborhood of 50 kJ/mol. At the same temperature where mixtures are all in their glassy states, the values of tau(nu) of several mixtures are comparable. The Arrhenius temperature dependence of tau(nu) does not continue to higher temperatures and instead it crosses over to a stronger temperature dependence at temperatures above Tg. The dielectric relaxation strength of the nu-process, Deltaepsilon(nu)(T), has a stronger temperature dependence above Tg than below, mimicking the change of enthalpy, entropy, and volume when crossing Tg. These general property of the nu-process (except for the magnitude of the activation energy) had been found before in the secondary relaxation of the faster component in several binary nonaqueous mixtures. Other properties of the secondary relaxation in these nonaqueous mixtures have helped to identify it as the Johari-Goldstein (JG) secondary relaxation of the faster component. The similarities in properties lead us to conclude that the nu-processes in water mixtures are the JG secondary relaxations of water. The conclusion is reinforced by the processes behaving similarly to the nu-process found in 6 A thick water layer (two molecular layers) in fully hydrated Na-vermiculite clay, and in water confined in molecular sieves, silica hydrogels, and poly(2-hydroxyethyl methacrylate) hydrogels.
Collapse
Affiliation(s)
- S Capaccioli
- Dipartimento di Fisica, Università di Pisa, Largo B. Pontecorvo 3, I-56127, Pisa, Italy
| | | | | |
Collapse
|
49
|
Kaminska E, Kaminski K, Paluch M, Ziolo J, Ngai KL. Additive property of secondary relaxation processes in di-n-octyl and di-isooctyl phthalates: Signature of non-Johari-Goldstein relaxation. J Chem Phys 2007; 126:174501. [PMID: 17492868 DOI: 10.1063/1.2728903] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Broadband dielectric spectroscopy was used to study relaxation dynamics of supercooled di-n-octyl phthalate, di-isooctyl phthalate, and their mixtures. Additionally, low temperature measurements were performed to investigate the nature of the secondary relaxation processes in both glass formers. The authors found that the secondary relaxation observed in the mixture is the additive sum of the secondary relaxations of the two components. This experimental evidence indicates that these secondary relaxation processes are intramolecular in origin, and they are non-Johari-Goldstein secondary relaxations.
Collapse
Affiliation(s)
- Ewa Kaminska
- Institute of Physics, Silesian University, Uniwersytecka 4, 40-007 Katowice, Poland
| | | | | | | | | |
Collapse
|