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Hoshino T, Okamoto Y, Yamamoto A, Masunaga H. Dynamic behaviours of epoxy resin thin films during the curing process. SOFT MATTER 2023; 19:3267-3272. [PMID: 37082885 DOI: 10.1039/d2sm01500e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Epoxy resin thin films are widely used in applications such as coating materials, insulator films, and adhesives; accordingly, investigations of their physical properties have garnered increasing importance. Although the physical properties of thermoset epoxy thin films are strongly affected by the curing conditions, such as the heating temperature and curing time, the dynamic properties during the curing process have not been studied thoroughly. In this study, we investigated the thermal fluctuations on the surface of epoxy resin thin films using grazing-incidence X-ray photon correlation spectroscopy, to elucidate the dynamic behaviours during the curing process. We thus succeeded in observing the freezing of capillary waves during the thermal curing process. These results are expected to facilitate a deeper understanding of the curing mechanisms of various thin films.
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Affiliation(s)
- Taiki Hoshino
- International Center for Synchrotron Radiation Innovation Smart (SRIS), Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan.
- Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
- RIKEN SPring-8 Center, 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
| | - Yasushi Okamoto
- DENSO CORPORATION, 1-1, Showa-cho, Kariya, Aichi 448-8661, Japan
| | - Atsushi Yamamoto
- DENSO CORPORATION, 1-1, Showa-cho, Kariya, Aichi 448-8661, Japan
| | - Hiroyasu Masunaga
- Japan Synchrotron Radiation Research Institute/SPring-8, 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
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Matsumoto M, Takeuchi K, Inoue Y, Tsunashima K, Yamada H. Molecular Insight into the Ionic Conduction of Quaternary Ammonium and Phosphonium Cation-Based Ionic Liquids Using Dielectric and Spectroscopy Analyses. J Phys Chem B 2022; 126:10490-10499. [PMID: 36417887 DOI: 10.1021/acs.jpcb.2c06110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
We analyzed the primary properties of ionic liquids (ILs) comprising quaternary phosphonium cations and bis(trifluoromethylsulfonyl) amide anions and compared them with those of corresponding quaternary-ammonium-cation-based ILs. Broadband dielectric spectroscopy was used to confirm the coupling between the translational and orientational motions of ions, and our results demonstrated that the high ionic conductivity of the phosphonium-based ILs was attributed to their fast rotational dynamics. The differences between ILs with different cations were further evaluated using vibrational (Raman and terahertz) spectroscopy. The Raman spectroscopy data revealed that the cation structure affected the conformation and flexibility (conformational change) of the anion. Furthermore, terahertz spectroscopy allowed us to evaluate the relationship between ion transport and intermolecular interactions between the cation and anion of ILs.
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Affiliation(s)
- Mitsuhiro Matsumoto
- Department of Chemical Engineering, National Institute of Technology, Nara College, 22 Yata-cho, Yamatokoriyama, Nara639-1080, Japan
| | - Kazuki Takeuchi
- Department of Chemical Engineering, National Institute of Technology, Nara College, 22 Yata-cho, Yamatokoriyama, Nara639-1080, Japan
| | - Yohtaro Inoue
- Research Division of Polymer Functional Materials, Osaka Research Institute of Industrial Science and Technology, 2-7-1 Ayumino, Izumi, Osaka594-1157, Japan
| | - Katsuhiko Tsunashima
- Department of Applied Chemistry and Biochemistry, National Institute of Technology, Wakayama College, Gobo, Wakayama644-0023, Japan
| | - Hirohisa Yamada
- Department of Chemical Engineering, National Institute of Technology, Nara College, 22 Yata-cho, Yamatokoriyama, Nara639-1080, Japan
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Thomas Koller M, Kerscher M, Andreas Fröba P. Accurate Determination of Viscosity and Surface Tension by Surface Light Scattering in the Presence of a Contribution from the Rotational Flow in the Bulk of the Fluid. J Colloid Interface Sci 2022; 626:899-915. [DOI: 10.1016/j.jcis.2022.06.129] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Revised: 06/22/2022] [Accepted: 06/24/2022] [Indexed: 10/31/2022]
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4
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Hirade T, Michishio K, Kobayashi Y, Oshima N. Temperature dependence of positron annihilation lifetime in near-surface and bulk of room-temperature ionic liquid observed by a slow positron beam. Chem Phys Lett 2022. [DOI: 10.1016/j.cplett.2022.139507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Zaitsau DH, Ludwig R, Verevkin SP. Determination of the dispersion forces in the gas phase structures of ionic liquids using exclusively thermodynamic methods. Phys Chem Chem Phys 2021; 23:7398-7406. [PMID: 33876099 DOI: 10.1039/d0cp05439a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Ionic liquids are described by a delicate balance of Coulomb interaction, hydrogen bonding and dispersion forces. Dissecting the different types of interactions from thermodynamic properties is still a challenge. Here, we show that comparison of vaporization enthalpies of tetra-alkyl-ammonium ionic liquids with bis(trifluoromethylsulfonyl)imide [NTf2]- anions and the related molecular liquids, trialkylamines, allows for determining dispersion interactions in the gas phase ion-pairs. For this purpose, we measured vapor pressures and vaporization enthalpies of these ionic and molecular liquids by using a quartz-crystal microbalance. For supporting these data, we determined the vaporization enthalpies additionally from experimental activity coefficients at infinite dilution. Characteristic alkyl chain length dependences of the vaporization enthalpies have been established and were used for quantifying the dispersion forces in the gas phase species. The dissected dispersion contributions suggest that the alkyl chains do not show star-like topologies but embrace the anion maximizing the dispersion interactions. For the longest alkyl chains with eight carbon atoms, the dispersion interaction is as strong as two and a half hydrogen bonds. The proportion of dispersion in the gas phase species depending on the number of methylene groups in the ammonium cations is strongly supported by quantum chemical calculations.
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Affiliation(s)
- Dzmitry H Zaitsau
- Universität Rostock, Institut für Chemie, Abteilung für Physikalische Chemie, Dr-Lorenz-Weg 2, 18059, Rostock, Germany.
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Shirota H, Ando M, Kakinuma S, Takahashi K. Ultrafast Dynamics in Nonaromatic Cation Based Ionic Liquids: A Femtosecond Raman-Induced Kerr Effect Spectroscopic Study. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2020. [DOI: 10.1246/bcsj.20200198] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Hideaki Shirota
- Department of Chemistry, Chiba University, 1-33 Yayoi, Inage-ku, Chiba 263-8522, Japan
| | - Masatoshi Ando
- Department of Chemistry, Chiba University, 1-33 Yayoi, Inage-ku, Chiba 263-8522, Japan
| | - Shohei Kakinuma
- Department of Chemistry, Chiba University, 1-33 Yayoi, Inage-ku, Chiba 263-8522, Japan
| | - Kotaro Takahashi
- Department of Chemistry, Chiba University, 1-33 Yayoi, Inage-ku, Chiba 263-8522, Japan
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8
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Experimental and theoretical assessment of the interactions of ionic liquids (ILs) with fluoridated compounds (HF, R-F) in organic medium. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2018.12.040] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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9
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Abe H, Murata K, Kiyokawa S, Yoshimura Y. Surface tension anomalies in room temperature ionic liquids-acetone solutions. Chem Phys Lett 2018. [DOI: 10.1016/j.cplett.2018.03.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Panda S, Kundu K, Umapathy S, Gardas RL. A Combined Experimental and Theoretical Approach to Understand the Structure and Properties ofN-Methylpyrrolidone-Based Protic Ionic Liquids. Chemphyschem 2017; 18:3416-3428. [DOI: 10.1002/cphc.201700886] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Revised: 09/17/2017] [Indexed: 12/23/2022]
Affiliation(s)
- Somenath Panda
- Department of Chemistry; Indian Institute of Technology Madras; Chennai 600036 India
| | - Kaushik Kundu
- Department of Inorganic and Physical Chemistry; Indian Institute of Science; Bangalore 560012 India
| | - Siva Umapathy
- Department of Inorganic and Physical Chemistry; Indian Institute of Science; Bangalore 560012 India
| | - Ramesh L. Gardas
- Department of Chemistry; Indian Institute of Technology Madras; Chennai 600036 India
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12
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Martínez-Romero N, Aguilar-Sánchez R, Fu YC, Homberger M, Simon U. Electrochemical stability and electron transfer across 4-methyl-4′-(n-mercaptoalkyl) biphenyl monolayers on Au(100)-(1×1) electrodes in 1-hexyl-3-methylimidazolium hexafluorophosphate ionic liquid. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.02.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Sugioka D, Kameyama T, Kuwabata S, Torimoto T. Single-step preparation of two-dimensionally organized gold particles via ionic liquid/metal sputter deposition. Phys Chem Chem Phys 2015; 17:13150-9. [DOI: 10.1039/c5cp01602a] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Sputter deposition of Au onto an ionic liquid with a hydroxyl-functionalized cation produces a uniform monoparticle film on the liquid surface. The size of nanoparticles is controlled by the sputtering conditions.
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Affiliation(s)
- Daisuke Sugioka
- Graduate School of Engineering
- Nagoya University
- Furo-cho
- Chikusa-ku
- Japan
| | - Tatsuya Kameyama
- Graduate School of Engineering
- Nagoya University
- Furo-cho
- Chikusa-ku
- Japan
| | | | - Tsukasa Torimoto
- Graduate School of Engineering
- Nagoya University
- Furo-cho
- Chikusa-ku
- Japan
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15
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Jeon Y, Vaknin D, Bu W, Sung J, Ouchi Y, Sung W, Kim D. Surface nanocrystallization of an ionic liquid. PHYSICAL REVIEW LETTERS 2012; 108:055502. [PMID: 22400939 DOI: 10.1103/physrevlett.108.055502] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2011] [Revised: 11/27/2011] [Indexed: 05/31/2023]
Abstract
Surface crystallization at the vapor-liquid interface of the ionic liquid (1-butyl-3-methylimidazolium hexafluorophosphate) is observed in synchrotron x-ray diffraction studies. Sharp Bragg reflections emerge in grazing-angle x-ray diffraction patterns 37 °C above the bulk melting temperature, indicating the presence of a long-range ordered phase at the surface in coexistence with the bulk parent liquid. The unique structure of the vapor-liquid interface where butyl chains attached to the cations are expelled to the vapor side facilitates interionic electrostatic interactions that lead to the crystallization. Our results demonstrate the complexity of ionic-liquid structure with their tendency to spontaneously phase separate into nanodomains with finite correlation lengths in coexistence with the liquid phase. By virtue of interfacial boundary conditions, these nanodomains grow laterally to form quasi-two-dimensional crystals.
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Affiliation(s)
- Yoonnam Jeon
- Department of Physics, Sogang University, Seoul 121-742, Korea
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Steinrück HP. Recent developments in the study of ionic liquid interfaces using X-ray photoelectron spectroscopy and potential future directions. Phys Chem Chem Phys 2012; 14:5010-29. [DOI: 10.1039/c2cp24087d] [Citation(s) in RCA: 96] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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17
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Sun X, Luo H, Dai S. Ionic liquids-based extraction: a promising strategy for the advanced nuclear fuel cycle. Chem Rev 2011; 112:2100-28. [PMID: 22136437 DOI: 10.1021/cr200193x] [Citation(s) in RCA: 553] [Impact Index Per Article: 42.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xiaoqi Sun
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
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Tariq M, Freire MG, Saramago B, Coutinho JAP, Lopes JNC, Rebelo LPN. Surface tension of ionic liquids and ionic liquid solutions. Chem Soc Rev 2011; 41:829-68. [PMID: 21811714 DOI: 10.1039/c1cs15146k] [Citation(s) in RCA: 228] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Some of the most active scientific research fronts of the past decade are centered on ionic liquids. These fluids present characteristic surface behavior and distinctive trends of their surface tension versus temperature. One way to explore and understand their unique nature is to study their surface properties. This critical review analyses most of the surface tension data reported between 2001 and 2010 (187 references).
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Affiliation(s)
- Mohammad Tariq
- Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, Av. República, Apt. 127, 2780-901 Oeiras, Portugal
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Fernandes AM, Rocha MAA, Freire MG, Marrucho IM, Coutinho JAP, Santos LMNBF. Evaluation of Cation−Anion Interaction Strength in Ionic Liquids. J Phys Chem B 2011; 115:4033-41. [DOI: 10.1021/jp201084x] [Citation(s) in RCA: 199] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Marisa A. A. Rocha
- CIQ, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, R. Campo Alegre 687, P-4169-007 Porto, Portugal
| | | | - Isabel M. Marrucho
- Instituto de Tecnologia Química e Biológica, ITQB2, Universidade Nova de Lisboa, Avenida República, 2780-157 Oeiras, Portugal,
| | | | - Luís M. N. B. F. Santos
- CIQ, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, R. Campo Alegre 687, P-4169-007 Porto, Portugal
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Ohmasa Y, Yao M. Surface waves on non-Newtonian viscoelastic liquids. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2011; 83:031605. [PMID: 21517511 DOI: 10.1103/physreve.83.031605] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2010] [Indexed: 05/30/2023]
Abstract
In the present work, we study the dynamics of thermally excited fluctuations on the surface of non-Newtonian viscoelastic liquids, which shows complex behaviors such as crossover between the capillary wave and the elastic wave, and the coexistence of several modes. We show that the power spectrum is separated into surface localized modes and the bulk shear modes, and they are decomposed further into several modes using the partial fraction expansion. The peak positions of these modes are characterized by roots of a polynomial equation. We calculate the decomposition of the surface wave spectra numerically, and discuss evolution of constituent peaks with liquid parameters.
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Affiliation(s)
- Y Ohmasa
- Department of Intelligent Mechanical Engineering, Faculty of Engineering, Hiroshima Institute of Technology, Hiroshima 731-5193, Japan.
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21
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Mizoshiri M, Nagao T, Mizoguchi Y, Yao M. Dielectric permittivity of room temperature ionic liquids: A relation to the polar and nonpolar domain structures. J Chem Phys 2010; 132:164510. [DOI: 10.1063/1.3419906] [Citation(s) in RCA: 43] [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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