1
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Miyata T, Sato YK, Kawagoe Y, Shirasu K, Wang HF, Kumagai A, Kinoshita S, Mizukami M, Yoshida K, Huang HH, Okabe T, Hagita K, Mizoguchi T, Jinnai H. Effect of inorganic material surface chemistry on structures and fracture behaviours of epoxy resin. Nat Commun 2024; 15:1898. [PMID: 38459006 PMCID: PMC10923874 DOI: 10.1038/s41467-024-46138-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2023] [Accepted: 02/15/2024] [Indexed: 03/10/2024] Open
Abstract
The mechanisms underlying the influence of the surface chemistry of inorganic materials on polymer structures and fracture behaviours near adhesive interfaces are not fully understood. This study demonstrates the first clear and direct evidence that molecular surface segregation and cross-linking of epoxy resin are driven by intermolecular forces at the inorganic surfaces alone, which can be linked directly to adhesive failure mechanisms. We prepare adhesive interfaces between epoxy resin and silicon substrates with varying surface chemistries (OH and H terminations) with a smoothness below 1 nm, which have different adhesive strengths by ~13 %. The epoxy resins within sub-nanometre distance from the surfaces with different chemistries exhibit distinct amine-to-epoxy ratios, cross-linked network structures, and adhesion energies. The OH- and H-terminated interfaces exhibit cohesive failure and interfacial delamination, respectively. The substrate surface chemistry impacts the cross-linked structures of the epoxy resins within several nanometres of the interfaces and the adsorption structures of molecules at the interfaces, which result in different fracture behaviours and adhesive strengths.
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Affiliation(s)
- Tomohiro Miyata
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Miyagi, 980-8577, Japan
| | - Yohei K Sato
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Miyagi, 980-8577, Japan
| | - Yoshiaki Kawagoe
- Department of Aerospace Engineering, Graduate School of Engineering, Tohoku University, 6-6-01 Aramaki Aza Aoba, Aoba-ku, Sendai, Miyagi, 980-8579, Japan.
| | - Keiichi Shirasu
- Department of Finemechanics, Graduate School of Engineering, Tohoku University, 6-6-01 Aramaki Aza Aoba, Aoba-ku, Sendai, Miyagi, 980-8579, Japan.
| | - Hsiao-Fang Wang
- Department of Chemical and Materials Engineering, National Central University, No. 300, Zhongda Rd., Zhongli Dist., Taoyuan City, 320317, Taiwan
| | - Akemi Kumagai
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Miyagi, 980-8577, Japan
| | - Sora Kinoshita
- Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, 6-6-07 Aramaki Aza Aoba, Aoba-ku, Sendai, Miyagi, 980-8579, Japan
| | - Masashi Mizukami
- New Industry Creation Hatchery Center, Tohoku University, Sendai, Miyagi, 980-0845, Japan
| | - Kaname Yoshida
- Nanostructures Research Laboratory, Japan Fine Ceramics Center, Nagoya, Aichi, 456-8587, Japan
| | - Hsin-Hui Huang
- Nanostructures Research Laboratory, Japan Fine Ceramics Center, Nagoya, Aichi, 456-8587, Japan
| | - Tomonaga Okabe
- Department of Aerospace Engineering, Graduate School of Engineering, Tohoku University, 6-6-01 Aramaki Aza Aoba, Aoba-ku, Sendai, Miyagi, 980-8579, Japan
- Research Center for Structural Materials, Polymer Matrix Hybrid Composite Materials Group, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki, 305-0047, Japan
- Department of Materials Science and Engineering, University of Washington, BOX 352120, Seattle, WA, 98195, USA
| | - Katsumi Hagita
- Department of Applied Physics, National Defense Academy, Yokosuka, Kanagawa, 239-0811, Japan
| | - Teruyasu Mizoguchi
- Institute of Industrial Science, The University of Tokyo, Meguro-ku, Tokyo, 153-8505, Japan
| | - Hiroshi Jinnai
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Miyagi, 980-8577, Japan.
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2
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Gel Network Amplifies Nano-Scale Adsorption at Solid/Liquid Interface to Sub-Millimeter-Scale. J Colloid Interface Sci 2022; 626:276-282. [DOI: 10.1016/j.jcis.2022.06.127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Revised: 06/20/2022] [Accepted: 06/24/2022] [Indexed: 11/22/2022]
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3
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SUZUKI Y, MIZUHATA M. Predictive Zeta Potential Measurement Method Applicable to Nonaqueous Solvents in High-concentration Dispersion Systems for the System of LiClO<sub>4</sub>–Propylene Carbonate Solution and LiCoO<sub>2</sub> Powder Sheet. ELECTROCHEMISTRY 2022. [DOI: 10.5796/electrochemistry.22-66050] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- Yoshimasa SUZUKI
- Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University
| | - Minoru MIZUHATA
- Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University
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4
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Recovery and characterization of useful benzene derivatives from spent engine oil through solvent extraction. Chem Eng Res Des 2021. [DOI: 10.1016/j.cherd.2021.08.031] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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5
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Yu M, Zhao S, Yang L, Ji N, Wang Y, Xiong L, Sun Q. Preparation of a superhydrophilic SiO 2 nanoparticles coated chitosan-sodium phytate film by a simple ethanol soaking process. Carbohydr Polym 2021; 271:118422. [PMID: 34364563 DOI: 10.1016/j.carbpol.2021.118422] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Revised: 07/04/2021] [Accepted: 07/06/2021] [Indexed: 12/25/2022]
Abstract
The development of environmentally friendly and transparent superhydrophilic food packaging materials is essential in our daily lives. The objective of this study was to develop a simple method of preparing a superhydrophilic, transparent, and biodegradable composite film. The composite film was obtained by soaking a chitosan-sodium phytate film in an ethanol solution of SiO2 nanoparticles. The results showed that when the chitosan-sodium phytate film was coated with SiO2 nanoparticles that were dissolved in 75% ethanol, its water contact angle (WCA) was reduced from 100° to 3°, and the film surface was changed from a hydrophobic to a superhydrophilic. Furthermore, the oxygen transmission rate (OTR) was significantly reduced, and the mechanical properties of the film were improved. The method is easy to carry out and can be used for the potential production of superhydrophilic materials.
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Affiliation(s)
- Mengting Yu
- College of Food Science and Engineering, Qingdao Agricultural University, Qingdao, Shandong Province 266109, China
| | - Shuangshuang Zhao
- College of Food Science and Engineering, Qingdao Agricultural University, Qingdao, Shandong Province 266109, China
| | - Lu Yang
- College of Food Science and Engineering, Qingdao Agricultural University, Qingdao, Shandong Province 266109, China
| | - Na Ji
- College of Food Science and Engineering, Qingdao Agricultural University, Qingdao, Shandong Province 266109, China
| | - Yanfei Wang
- College of Food Science and Engineering, Qingdao Agricultural University, Qingdao, Shandong Province 266109, China
| | - Liu Xiong
- College of Food Science and Engineering, Qingdao Agricultural University, Qingdao, Shandong Province 266109, China
| | - Qingjie Sun
- College of Food Science and Engineering, Qingdao Agricultural University, Qingdao, Shandong Province 266109, China.
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6
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Kitaoka H, Hashimoto K, Nishi N, Sakka T. Solid Surface Induced Anisotropic Clustering in Ethanol-Cyclohexane Binary Liquids Studied by Molecular Dynamics Simulations. CHEM LETT 2021. [DOI: 10.1246/cl.210292] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Haru Kitaoka
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Kota Hashimoto
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Naoya Nishi
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Tetsuo Sakka
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
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7
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Guo Y, Surblys D, Matsubara H, Ohara T. A molecular dynamics study of the effect of functional groups and side chain on adsorption of alcoholic surfactant and interfacial thermal transport. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116243] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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8
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Yamamoto R, Fujikawa S, Kimizuka N. Polar Switching of Dipolar Molecules Confined in Submicron- and Micron-sized Pores in Polymer Films. CHEM LETT 2020. [DOI: 10.1246/cl.190917] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Ryosuke Yamamoto
- 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
| | - Shigenori Fujikawa
- 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
- International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, 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
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9
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Yamamoto R, Kimizuka N. Polar Switching of Dipolar Molecules Induced by Solid Dispersion-to-organogel Phase Transition. CHEM LETT 2020. [DOI: 10.1246/cl.190950] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Ryosuke Yamamoto
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Nobuo Kimizuka
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
- Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
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10
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Boonpai S, Wannakao S, Suriye K, Márquez V, Panpranot J, Jongsomjit B, Praserthdam P, Bell AT. Influence of surface Sn species and hydrogen interactions on the OH group formation over spherical silica-supported tin oxide catalysts. REACT CHEM ENG 2020. [DOI: 10.1039/d0re00178c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The catalyst stability for propane dehydrogenation can be improved by adding acidic nanomaterials that serve as coke reservoirs.
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Affiliation(s)
- Sirawat Boonpai
- Center of Excellence on Catalysis and Catalytic Reaction Engineering
- Department of Chemical Engineering
- Faculty of Engineering
- Chulalongkorn University
- Bangkok 10330
| | | | | | - Victor Márquez
- Center of Excellence on Catalysis and Catalytic Reaction Engineering
- Department of Chemical Engineering
- Faculty of Engineering
- Chulalongkorn University
- Bangkok 10330
| | - Joongjai Panpranot
- Center of Excellence on Catalysis and Catalytic Reaction Engineering
- Department of Chemical Engineering
- Faculty of Engineering
- Chulalongkorn University
- Bangkok 10330
| | - Bunjerd Jongsomjit
- Center of Excellence on Catalysis and Catalytic Reaction Engineering
- Department of Chemical Engineering
- Faculty of Engineering
- Chulalongkorn University
- Bangkok 10330
| | - Piyasan Praserthdam
- Center of Excellence on Catalysis and Catalytic Reaction Engineering
- Department of Chemical Engineering
- Faculty of Engineering
- Chulalongkorn University
- Bangkok 10330
| | - Alexis T. Bell
- Department of Chemical and Biomolecular Engineering
- University of California, Berkeley
- California 94720-1462
- USA
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11
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Yamamoto R, Minami Y, Hui JKH, Morikawa MA, Kimizuka N. Enhanced Electric Polarization and Polar Switching of Dipolar Aromatic Liquids Confined in Supramolecular Gel Networks. J Am Chem Soc 2019; 142:1424-1432. [PMID: 31880931 DOI: 10.1021/jacs.9b11276] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Ryosuke Yamamoto
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Yusuke Minami
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Joseph K.-H. Hui
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Masa-aki Morikawa
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
- Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Nobuo Kimizuka
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
- Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
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12
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He X, Ngo D, Kim SH. Mechanochemical Reactions of Adsorbates at Tribological Interfaces: Tribopolymerizations of Allyl Alcohol Coadsorbed with Water on Silicon Oxide. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:15451-15458. [PMID: 31390866 DOI: 10.1021/acs.langmuir.9b01663] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Mechanochemical reactions of adsorbed molecules at tribological interfaces can benefit or impede lubrication, depending on the type of reactions induced by the interfacial shear or friction. Shear-induced polymerization of oxidatively chemisorbed organic species can occur at tribological interfaces, and their products can mitigate the wear of the surface in the case of the intermittent cessation of the lubricant supply. In contrast, tribochemical reactions involving water molecules impinging from the ambient air could facilitate surface wear. In this study, we investigated how such processes are affected when a silicon oxide surface is exposed to the environment containing both water and polymerizable organic molecules. For the polymerizable organic moiety, allyl alcohol was chosen because it is known to have a good tribopolymerization activity and can compete with water for surface adsorption sites. The adsorbate composition can be divided into two regimes: water-rich and alcohol-rich. The tribopolymerization yield was found to be significantly enhanced, compared to the alcohol-only case, in both water-rich and alcohol-rich regimes. The coadsorbed water molecules appeared to be incorporated into the tribopolymerization product of allyl alcohol. The friction coefficient qualitatively correlated with the tribopolymerization yield. Surprisingly, a small degree of surface wear was observed in the alcohol-rich regime, although wear was completely suppressed in the water-rich regime and the alcohol-only condition. These results suggested that the wear prevention effect does not necessarily correlate with the tribopolymerization effects.
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Affiliation(s)
- Xin He
- Department of Chemical Engineering and Materials Research Institute , Pennsylvania State University , University Park , Pennsylvania 16802 , United States
| | - Dien Ngo
- Department of Chemical Engineering and Materials Research Institute , Pennsylvania State University , University Park , Pennsylvania 16802 , United States
| | - Seong H Kim
- Department of Chemical Engineering and Materials Research Institute , Pennsylvania State University , University Park , Pennsylvania 16802 , United States
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14
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Abstract
Abstract
This article reviews the surface forces measurement as a novel tool for materials science. The history of the measurement is briefly described in the Introduction. The general overview covers specific features of the surface forces measurement as a tool for studying the solid-liquid interface, confined liquids and soft matter. This measurement is a powerful way for understanding interaction forces, and for characterizing (sometime unknown) phenomena at solid-liquid interfaces and soft complex matters. The surface force apparatus (SFA) we developed for opaque samples can study not only opaque samples in various media, but also electrochemical processes under various electrochemical conditions. Electrochemical SFA enables us to determine the distribution of counterions between strongly bound ones in the Stern layer and those diffused in the Gouy-Chapman layer. The shear measurement is another active area of the SFA research. We introduced a resonance method, i.e. the resonance shear measurement (RSM), that is used to study the effective viscosity and lubricity of confined liquids in their thickness from μm to contact. Advantages of these measurements are discussed by describing examples of each measurement. These studies demonstrate how the forces measurement is used for characterizing solid-liquid interfaces, confined liquids and reveal unknown phenomena. The readers will be introduced to the broad applications of the forces measurement in the materials science field.
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15
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Yasui T, Kamio E, Matsuyama H. Inorganic/Organic Double-Network Ion Gels with Partially Developed Silica-Particle Network. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:10622-10633. [PMID: 30119613 DOI: 10.1021/acs.langmuir.8b01930] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Tough inorganic/organic composite network gels consisting of a partially developed silica-particle network and a large amount of an ionic liquid, named micro-double-network (μ-DN) ion gel, are fabricated via two methods. One is a one-pot/one-step process conducted using a simultaneous network formation via sol-gel reaction of tetraethyl orthosilicate and free radical polymerization of N, N-dimethylacrylamide in an ionic liquid. When the network formation rates of the inorganic and organic networks are almost the same, the μ-DN structure is formed. The second method is simpler and involved the use of silica nanoparticles as the starting material. By controlling the dispersion state of the silica nanoparticles in an ionic liquid, the μ-DN structure is formed. In both μ-DN ion gels, silica nanoparticles partially aggregate and form network-like clusters. When a large deformation is induced in the μ-DN ion gels, the silica-particle clusters rupture and dissipate the loaded energy. The fracture stress and Young's modulus of the μ-DN ion gel increase as the size of the silica nanoparticles decreases. The increment in the mechanical strength would have been caused by the increase in the total van der Waals attraction forces and the total number of hydrogen bonding in the silica-particle networks.
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Affiliation(s)
- Tomoki Yasui
- Center for Membrane and Film Technology and Department of Chemical Science and Engineering , Kobe University , 1-1 Rokkodai-cho , Nada-ku, Kobe , Hyogo 657-8501 , Japan
| | - Eiji Kamio
- Center for Membrane and Film Technology and Department of Chemical Science and Engineering , Kobe University , 1-1 Rokkodai-cho , Nada-ku, Kobe , Hyogo 657-8501 , Japan
| | - Hideto Matsuyama
- Center for Membrane and Film Technology and Department of Chemical Science and Engineering , Kobe University , 1-1 Rokkodai-cho , Nada-ku, Kobe , Hyogo 657-8501 , Japan
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16
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Wang Y, Cai R, Chen L, Cai X, Chen R, Chen C, Ge G. Experimental and Modeling Studies on the Filtration of SiO 2 Nanoparticles Aerosolized from Different Solvents. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:8733-8744. [PMID: 30001129 DOI: 10.1021/acs.est.8b02010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The filtration performance of a fibrous filter in removing nano-SiO2 aerosols atomized using different solvents including methanol, ethanol, 1-propanol, water, and the ethanol/water mixture has been investigated. Through discrete element method (DEM) simulation and filtration experiments, the efficiency variation caused by the combinative interaction of the particle-filter adhesion and interparticle attraction has been analyzed and verified. The adhesion force between the solvent-coated nanoparticles and the filter is considered as the key factor to influence their initial filtration efficiency and can be balanced by their interparticle interaction. The stronger the adhesion, the higher the initial filtration efficiency. Primary aggregate is formed through the particle-fiber interaction, and further agglomerate is caused by particle migration on the fibers, i.e. secondary aggregate. Hydrogen bonding interaction is considered as the main factor causing interparticle secondary agglomeration, and plenty of OH groups existing in the nano-SiO2 aerosols yielded from alcohol promotes the particle secondary aggregation. As a result, the Brown diffusion capture of the filter is significantly abated, and the as-formed agglomerate is scraped off the filter surface by the alcohol molecules, causing the filtration efficiency decreases. This study highlights the surface affinity properties of nanoaerosols and their balance between particle-particle and particle-fiber interactions in the filtration process.
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Affiliation(s)
- Youfeng Wang
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience , National Center for Nanoscience and Technology , Beijing 100190 , P. R. China
| | - Rongrong Cai
- Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Education Ministry, School of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou 510640 , P. R. China
| | - Lan Chen
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience , National Center for Nanoscience and Technology , Beijing 100190 , P. R. China
| | - Xiaoyong Cai
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience , National Center for Nanoscience and Technology , Beijing 100190 , P. R. China
| | - Rui Chen
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience , National Center for Nanoscience and Technology , Beijing 100190 , P. R. China
| | - Chunying Chen
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience , National Center for Nanoscience and Technology , Beijing 100190 , P. R. China
| | - Guanglu Ge
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience , National Center for Nanoscience and Technology , Beijing 100190 , P. R. China
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17
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Mhanna R, Abdel Hamid AR, Dutta S, Lefort R, Noirez L, Frick B, Morineau D. More room for microphase separation: An extended study on binary liquids confined in SBA-15 cylindrical pores. J Chem Phys 2017; 146:024501. [DOI: 10.1063/1.4972126] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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18
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Kurihara K. Molecular Architecture Studied by the Surface Forces Measurement. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:12290-12303. [PMID: 27807975 DOI: 10.1021/acs.langmuir.6b03074] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
This feature article reviews the surface forces measurement as a tool for studying molecular architecture chemistry. The history of the measurement is briefly described in the Introduction. The general overview covers specific features of the surface forces measurement as a tool for studying and using molecular architecture. This measurement is powerful for understanding interaction forces and for characterizing and discovering the phenomena at solid-liquid interfaces and soft complex matter. An apparatus for opaque samples was developed, which can be used to study not only opaque samples in various media but also electrochemical processes under various electrochemical potentials. Our studies of molecular architecture are reviewed; they include biological molecular recognition especially involved in the enzyme-substrate interaction; polyelectrolyte brushes exhibiting steric repulsion, which can be reproduced by the osmotic pressure of the counterions, and a density-dependent transition; the hydrogen-bonded molecular macrocluster formation of alcohol and carboxylic acids adsorbed on silica in nonpolar solvents such as cyclohexane; and surface forces between ferrocene-modified electrodes under various applied potentials. These studies demonstrate how the forces measurement is used to identify interacting species such as in biological systems to reveal unknown phenomena and to characterize soft complex matter and the effective potential of the electrodes. Readers will be introduced to the broad applications of the force measurement.
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Affiliation(s)
- Kazue Kurihara
- Institute of Multidisciplinary Research for Advanced Materials & Advanced Institute for Materials Research, Tohoku University , Katahira, Aoba-ku, Sendai 980-8577, Japan
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George JP, Kumar P, Telmore VM, Deb AC, Kumar A, Radhakrishna J. Separation of urea, hexamethylenetetramine, and their reaction products in sol–gel feed solution by zwitterionic HILIC. J LIQ CHROMATOGR R T 2016. [DOI: 10.1080/10826076.2015.1132726] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
| | - Pranaw Kumar
- Fuel Chemistry Division, Bhabha Atomic Research Centre, Mumbai, Maharashtra, India
| | | | - Ashok Chandra Deb
- Fuel Chemistry Division, Bhabha Atomic Research Centre, Mumbai, Maharashtra, India
| | - Ashok Kumar
- Fuel Chemistry Division, Bhabha Atomic Research Centre, Mumbai, Maharashtra, India
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20
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Fukami K, Kinoshita M. ELECTROCHEMISTRY 2016; 84:726-731. [DOI: 10.5796/electrochemistry.84.726] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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21
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Soga Y, Imanaka H, Imamura K, Ishida N. Effect of surface hydrophobicity on short-range hydrophobic attraction between silanated silica surfaces. ADV POWDER TECHNOL 2015. [DOI: 10.1016/j.apt.2015.10.017] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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22
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Karnes JJ, Gobrogge EA, Walker RA, Benjamin I. Unusual Structure and Dynamics at Silica/Methanol and Silica/Ethanol Interfaces—A Molecular Dynamics and Nonlinear Optical Study. J Phys Chem B 2015; 120:1569-78. [DOI: 10.1021/acs.jpcb.5b07777] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- John J. Karnes
- Department
of Chemistry and Biochemistry, University of California-Santa Cruz, Santa
Cruz, California 95064, United States
| | - Eric A. Gobrogge
- Department
of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59715, United States
| | - Robert A. Walker
- Department
of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59715, United States
| | - Ilan Benjamin
- Department
of Chemistry and Biochemistry, University of California-Santa Cruz, Santa
Cruz, California 95064, United States
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Sakai K, Okada K, Uka A, Misono T, Endo T, Sasaki S, Abe M, Sakai H. Effects of Water on Solvation Layers of Imidazolium-Type Room Temperature Ionic Liquids on Silica and Mica. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:6085-6091. [PMID: 25996798 DOI: 10.1021/acs.langmuir.5b01184] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Effects of the addition of water on solvation layers of imidazolium-type room temperature ionic liquids (RT-ILs) have been studied through force curve measurements of atomic force microscopy (AFM). Two kinds of RT-ILs were employed in this study; one is a hydrophilic RT-IL (1-butyl-3-methylimidazolium tetrafluoroborate, BmimBF4), and the other is a hydrophobic one (1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, EmimTFSI). These RT-ILs form solvation layers on hydrophilic solid substances (i.e., silica and mica) in the absence of added water. The addition of water into BmimBF4 resulted in the disruption of the solvation layers and then the formation of an interfacial water phase on silica. In contrast, the formation of the interfacial water phase was not evidenced on mica because of the absence of hydrogen-bonding sites on the mica surface. Interestingly, the addition of water into EmimTFSI induced the formation of the interfacial water phase on the two solid surfaces. In the EmimTFSI system, importantly, significantly greater adhesion forces were observed on silica than on mica. This reflects the different formation mechanisms of the interfacial water phase on the two solid surfaces. We conclude that the hydrogen bonding is a key factor in determining whether water molecules can be adsorbed on the solid surfaces, but it is also necessary to take into account the hydrophilic/hydrophobic nature of the RT-ILs.
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Affiliation(s)
| | | | | | | | | | - Shinya Sasaki
- §Department of Mechanical Engineering, Faculty of Engineering, Tokyo University of Science, 6-3-1 Niijuku, Katsushika, Tokyo 125-8585, Japan
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Xu H, Zhang D, Hu J, Tian C, Shen YR. Structure of the submonolayer of ethanol adsorption on a vapor/fused silica interface studied with sum frequency vibrational spectroscopy. J Phys Chem A 2015; 119:4573-80. [PMID: 25580676 DOI: 10.1021/jp510706u] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Sum-frequency vibrational spectroscopy in the CH and OH stretch region was used to study ethanol adsorption on fused silica from vapor of different ethanol partial pressures. It was found that the adsorbed ethanol molecules were oriented with their methyl group tilted away from the surface normal by an average angle of ∼45° at low ethanol vapor pressures and ∼39° when approaching saturated vapor pressure. The spectral change with ethanol vapor pressure and the deduced adsorption isotherm show that ethanol molecules have two distinct adsorption sites on silica: One is the silanol group site to which an ethanol molecule can be strongly hydrogen-bonded, and the other is the siloxane (Si-O-Si) group site to which an ethanol molecule can be weakly bonded. The presence of water in vapor significantly reduced the surface coverage of ethanol on silica due to competitive adsorption between ethanol and water.
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Affiliation(s)
- Huijie Xu
- †Department of Physics, State Key Laboratory of Surface Physics, and Key Laboratory of Micro- and Nano-Photonic Structures (MOE), Fudan University, Shanghai 200433, China
| | - Donghua Zhang
- ‡Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
| | - Jun Hu
- ‡Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
| | - Chuanshan Tian
- †Department of Physics, State Key Laboratory of Surface Physics, and Key Laboratory of Micro- and Nano-Photonic Structures (MOE), Fudan University, Shanghai 200433, China.,§Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China
| | - Y Ron Shen
- †Department of Physics, State Key Laboratory of Surface Physics, and Key Laboratory of Micro- and Nano-Photonic Structures (MOE), Fudan University, Shanghai 200433, China.,∥Department of Physics, University of California, Berkeley, California 94720, United States
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Mukai SA, Koyama T, Tsujii K, Deguchi S. Anomalous long-range repulsion between silica surfaces induced by density inhomogeneities in supercritical ethanol. SOFT MATTER 2014; 10:6645-6650. [PMID: 25037983 DOI: 10.1039/c4sm00787e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Anomalous long-range repulsion, extending over several micrometres, emerged between silica surfaces around the ridge of density fluctuations in supercritical ethanol at temperatures and pressures near the gas/liquid critical point (T(c) = 241 °C, P(c) = 6.14 MPa). Analysis shows that augmentation of ethanol density around silica surfaces in the presence of density fluctuations facilitates dissociation of silanol groups, leading to long-range electrostatic repulsion in the nonpolar medium.
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Affiliation(s)
- Sada-atsu Mukai
- Research and Development Center for Marine Biosciences, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka 237-0061, Japan.
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26
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Koda R, Koyama A, Fukami K, Nishi N, Sakka T, Abe T, Kitada A, Murase K, Kinoshita M. Effect of cation species on surface-induced phase transition observed for platinum complex anions in platinum electrodeposition using nanoporous silicon. J Chem Phys 2014; 141:074701. [DOI: 10.1063/1.4892596] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
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Park JW, Shumaker-Parry JS. Structural Study of Citrate Layers on Gold Nanoparticles: Role of Intermolecular Interactions in Stabilizing Nanoparticles. J Am Chem Soc 2014; 136:1907-21. [DOI: 10.1021/ja4097384] [Citation(s) in RCA: 439] [Impact Index Per Article: 43.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Jong-Won Park
- Department of Chemistry, University of Utah, 1400 East 315 South
RM 2020, Salt Lake City, Utah 84112, United States
| | - Jennifer S. Shumaker-Parry
- Department of Chemistry, University of Utah, 1400 East 315 South
RM 2020, Salt Lake City, Utah 84112, United States
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28
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KASUYA M, KURIHARA K. Novel Surface Forces Apparatus for Characterizing Solid-Liquid Interfaces. ELECTROCHEMISTRY 2014. [DOI: 10.5796/electrochemistry.82.317] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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29
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Fukami K, Koda R, Sakka T, Ogata Y, Kinoshita M. Electrochemical deposition of platinum within nanopores on silicon: Drastic acceleration originating from surface-induced phase transition. J Chem Phys 2013; 138:094702. [DOI: 10.1063/1.4793526] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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30
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Mizukami M, Kobayashi A, Kurihara K. Structuring of interfacial water on silica surface in cyclohexane studied by surface forces measurement and sum frequency generation vibrational spectroscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:14284-14290. [PMID: 22974462 DOI: 10.1021/la303003u] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We investigated interfacial water, formed by adsorption or phase separation (prewetting transition), on a silica surface in water-cyclohexane binary liquids using a combination of colloidal probe atomic force microscopy (AFM) and sum frequency generation (SFG) vibrational spectroscopy. At 33 ± 9 ppm water, the long-range attraction extending to 19.4 ± 2.9 nm appeared, which was caused by the contact of water layers formed on silica surfaces. The attraction range increased with increasing water concentration and reached 97 ± 17 nm at the saturation concentration of water in cyclohexane (C*), indicating that the thickness of the water layer formed on silica was ca. 50 nm. The interfacial energy between the water adsorption layer and bulk solution (γ = 79.3 ± 2.0 mN/m) was estimated from the pull-off force, and was significantly larger than the value for the bulk water/cyclohexane interface (γ = 50.1 mN/m). SFG spectroscopy demonstrated that the interfacial water formed an icelike structure at C*. These results indicated that the interfacial water molecules formed an icelike ordered structure induced by the hydrogen bonding with surface silanol groups, resulting in the free OH groups being more exposed to the bulk solution. On the other hand, the water adsorption layer induced by phase separation at water concentrations above C* was found to be less ordered and its structure at the adsorption layer/bulk interface was almost the same as that of bulk water, although its thickness was almost the same as that formed at C*. To our knowledge, this is the first report of the observation of liquid adsorption layers formed by chemical interaction up to saturation and by the wetting transition above saturation, and their differences in the structure and properties at the molecular level.
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Affiliation(s)
- Masashi Mizukami
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, 980-8577, Japan
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31
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Wang J, Kanezashi M, Yoshioka T, Tsuru T. Effect of calcination temperature on the PV dehydration performance of alcohol aqueous solutions through BTESE-derived silica membranes. J Memb Sci 2012. [DOI: 10.1016/j.memsci.2012.05.073] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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32
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Tan L, Wan A. Structural changes in thermal-induced polyacrylonitrile gel under uniaxial drawing. Colloids Surf A Physicochem Eng Asp 2011. [DOI: 10.1016/j.colsurfa.2011.10.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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33
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José C, Bonetto RD, Gambaro LA, Torres MDPG, Foresti ML, Ferreira ML, Briand LE. Investigation of the causes of deactivation–degradation of the commercial biocatalyst Novozym® 435 in ethanol and ethanol–aqueous media. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.molcatb.2011.04.004] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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34
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Lee JH, Meredith JC. Non-DLVO silica interaction forces in NMP-water mixtures. II. An asymmetric system. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:10000-10006. [PMID: 21749082 DOI: 10.1021/la202176u] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The interaction between energetically asymmetric hydrophilic and hydrophobic surfaces has fundamental and practical importance in both industrial and natural colloidal systems. The interaction forces between a hydrophilic silica sphere and a silanated, hydrophobic glass plate in N-methyl-2-pyrrolidone (NMP)-water binary mixtures were measured using atomic force microscopy (AFM). A strong and long-range attractive force was observed in pure water and was attributed to the formation of capillary bridges associated with nanoscale bubbles initially present on the hydrophobic surface. When NMP was added, the capillary force and corresponding pull-off force became less attractive, which was explained readily in terms of the surface wettability by the binary solvent mixture. Similar to the case of symmetric (two hydrophilic) surfaces, the range of attraction between the asymmetric surfaces was maximized at around 30 vol % NMP, which is consistent with the formation of a thick adsorbed macrocluster layer on the hydrophilic silica surface.
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Affiliation(s)
- Jung-Hyun Lee
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, Georgia 30332-0100, United States
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35
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Lee JH, Gomez I, Meredith JC. Non-DLVO silica interaction forces in NMP-water mixtures. I. A symmetric system. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:6897-6904. [PMID: 21557629 DOI: 10.1021/la200976d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Despite the success of DLVO theory, there exist numerous examples of interactions that do not follow its predictions. One prominent example is the interaction between hydrophilic surfaces in mixtures of water with another polar, associating solvent. Interactions of such surfaces are still poorly understood yet play a key role in a wide variety of processes in nature, biology, and industry. The interaction forces between a silica sphere and a glass plate in N-methyl-2-pyrrolidone (NMP)-water binary mixtures were measured using the AFM technique. The interactions in pure NMP and pure water agreed qualitatively with DLVO theory. In contrast, the addition of NMP to water drastically altered the interactions, which no longer followed DLVO predictions. An unusually strong, long-range (50-80 nm), multistepped attractive force was observed on the approach of hydrophilic surfaces in the NMP concentration range of 30-50 vol %, where the adhesive pull-off force was also maximized. The maximum attractive force was observed at an NMP concentration near 30 vol %, consistent with the formation of a strong hydrogen-bonded complex between NMP and water near the solid surface. The analysis of force profiles, zeta potentials, solution viscosity, and contact angles suggests that attraction arises from the bridging of surface-adsorbed macrocluster layers known to form on hydrophilic surfaces in mixtures of associating liquids.
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Affiliation(s)
- Jung-Hyun Lee
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, Georgia 30332-0100, United States
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36
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Totland C, Steinkopf S, Blokhus AM, Nerdal W. Water structure and dynamics at a silica surface: Pake doublets in 1H NMR spectra. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:4690-4699. [PMID: 21413712 DOI: 10.1021/la1048997] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Detailed knowledge about the dynamics and structure of liquids in the vicinity of a solid surface is important in several fields of research. In this study a homogeneous model system of colloidal and nonporous silica particles with a narrow particle size distribution was used to examine such properties of adsorbed water and 1-heptanol. Doublet (1)H water resonances ("Pake doublets") indicate a preferred spatial orientation for the water molecules, as well as a lower molecular density in the surface-induced water structures compared to bulk water. These surface-induced structures are found to extend at least 8 nm from the silica surface. T(1) relaxation measurements at several temperatures indicate weaker H-bonding in the adsorbed water compared to bulk water. T(2) relaxation measurements at several temperatures reveal the presence of two water phases and give quantitative information on the mobility of water molecules and proton exchange processes. The presence of 1-heptanol changes the water characteristics, primarily in the water phase closer to the surface, where water molecules experience decreased translational and increased rotational freedom. In the absence of water, adsorbed 1-heptanol forms surface aggregates encompassing several molecular layers, where the first adsorbed layer shows severe restrictions in mobility and subsequent layers are more mobile.
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Affiliation(s)
- Christian Totland
- Department of Chemistry, University of Bergen, N-5007 Bergen, Norway
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37
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Kasuya M, Mizukami M, Kurihara K. Properties of Water at Solid Surface Revealed Using Surface Force Measurement. BUNSEKI KAGAKU 2010. [DOI: 10.2116/bunsekikagaku.59.957] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Motohiro Kasuya
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
| | - Masashi Mizukami
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
| | - Kazue Kurihara
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
- World Premier International Research Center, Advanced Institute for Materials Research
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38
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Mizukami M, Zhong G, Zhang L, Fukuchi I, Kurihara K. In situ polymerization of molecular macroclusters on a silica surface: poly(N-isopropylacrylamide) nanofilms. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:12364-12368. [PMID: 18823131 DOI: 10.1021/la8016936] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We have found that alcohols, carboxylic acids, and amides self-assemble into a unique molecular architecture, a hydrogen-bonded molecular macrocluster, when they are selectively adsorbed onto silica (glass and oxidized silicon) surfaces in nonpolar solvents such as cyclohexane. In our previous study, this phenomenon could be successfully applied to fabricate molecularly flat and defect-free nanofilms of several tens of nanometers thickness. In this study, we prepared a poly(N-isopropylacrylamide) [poly(NIPAAm)] film on the basis of in situ polymerization of a monomer macrocluster layer formed on silica surfaces and investigated how the molecular arrangement of the adsorbed NIPAAm monomers affects the efficiency of the polymerization of them. Poly(NIPAAm) films were prepared by the following two methods: (1) the one-solution method, the in situ photopolymerization of an NIPAAm monomer adsorption layer on silica in one solution (chloroform, cyclohexane, and toluene), and (2) the solution exchange method, adsorption of NIPAAm monomers onto a silica surface from NIPAAm (0.1 mol %) in chloroform, exhange of the solution to 0.005 mol % NIPAAm in cyclohexane, and then polymerization by UV irradiation. By the solution exchange method, molecularly flat, defect-free, and thermoresponsive films were obtained and the thickness could be controlled by the irradiation time, while only several nanometers thickness could be attained by the one-solution method. The structure of NIPAAm adsorption layers formed in each solution condition was characterized by attenuated total reflection Fourier transform infrared spectroscopy. It was revealed that only the solution exchange procedure induced the beta-sheet-like adsorbed structure of NIPAAm in which the double bonds of neighboring NIPAAm monomers were closely located, which should have resulted in effective polymerization.
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Affiliation(s)
- Masashi Mizukami
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan
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39
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Dong R, Keuser M, Zeng X, Zhao J, Zhang Y, Wu C, Pan D. Viscometric measurement of the thermodynamics of PAN terpolymer/DMSO/water system and effect of fiber-forming conditions on the morphology of PAN precursor. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/polb.21528] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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40
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Page PM, McCarty TA, Munson CA, Bright FV. The local microenvironment surrounding dansyl molecules attached to controlled pore glass in pure and alcohol-modified supercritical carbon dioxide. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:6616-6623. [PMID: 18537278 DOI: 10.1021/la8005184] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We report on the local microenvironment surrounding a free dansyl probe, dansyl attached to controlled pore glass (D-CPG), and dansyl molecules attached to trimethylsilyl-capped CPG (capped D-CPG) in pure and alcohol-modified supercritical CO2. These systems were selected to provide insights into the local microenvironment surrounding a reactive agent immobilized at a silica surface in contact with pure and cosolvent-modified supercritical CO2. Local surface-bound dansyl molecule solvation on the CPG surface depends on the dansyl molecule surface loading, the surface chemistry (uncapped versus capped), the bulk fluid density, and the alcohol gas phase absolute acidity. At high dansyl loadings, the surface-bound dansyl molecules are largely "solvated" by other dansyl molecules and these molecules are not affected significantly by the fluid phase. When the dansyl surface loading decreases, dansyl molecules can be accessed/solvated/wetted by the fluid phase. However, at the lowest dansyl loadings studied, the dansyl molecules are in a fluid inaccessible/restrictive environment and do not sense the fluid phase to any significant degree. In uncapped D-CPG, one can poise the system such that the local concentration of an environmentally less responsible cosolvent (alcohol) in the immediate vicinity of surface-immobilized dansyl molecules can approach 100% even though the bulk solution contains orders of magnitude less of this less environmentally responsible cosolvent. In capped C-CPG, the surface excess is attenuated in comparison to that of uncapped D-CPG. The extent of this cosolvent surface excess is discussed in terms of the dansyl surface loading, the local density fluctuations, the cosolvent and surface silanol gas phase acidities, and the silica surface chemistry. These results also have implications for cleanings, extractions, heterogeneous reactions, separations, and nanomaterial fabrication using supercritical fluids.
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Affiliation(s)
- Phillip M Page
- Department of Chemistry, Natural Sciences Complex, University at Buffalo, The State University of New York, Buffalo, NY 14260-3000, USA
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41
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Mizukami M, Kurihara K. ELECTROCHEMISTRY 2008; 76:763-767. [DOI: 10.5796/electrochemistry.76.763] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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42
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Andoh Y, Kurahashi K, Sakuma H, Yasuoka K, Kurihara K. Anisotropic molecular clustering in liquid ethanol induced by a charged fully hydroxylated silicon dioxide (SiO2) surface. Chem Phys Lett 2007. [DOI: 10.1016/j.cplett.2007.10.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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43
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Suzuki T, Koyama T, Kurihara K. Selectivity in substrate–enzyme complexation studied by surface forces measurement. Colloid Polym Sci 2007. [DOI: 10.1007/s00396-007-1746-1] [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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44
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Suzuki T, Zhang YW, Koyama T, Sasaki DY, Kurihara K. Direct Observation of Substrate−Enzyme Complexation by Surface Forces Measurement1. J Am Chem Soc 2006; 128:15209-14. [PMID: 17117872 DOI: 10.1021/ja061822k] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The substrate-enzyme complexation of heptaprenyl diphosphate synthase was directly investigated using colloidal probe atomic force microscopy (AFM) and a quartz crystal microbalance (QCM) in order to obtain new insights into the molecular mechanism of the enzyme reaction. This enzyme is composed of two dissociable subunits that exhibit a catalytic activity only when they are associated together in the presence of a cofactor, Mg2+, and a substrate, farnesyl diphosphate (FPP). The QCM measurement revealed that FPP was preferentially bound to subunit II in the presence of Mg2+, while the AFM measurement showed that the adhesive force between the subunits was observed only in the presence of both Mg2+ and FPP. This is the first direct demonstration of the specific interaction involved in the enzyme reaction. The dependence of the Mg2+ concentration on the specific interaction between subunits I and II well agreed with that on the enzyme activity of heptaprenyl diphosphate synthase. This indicated that the observed adhesive forces were indeed involved in the catalytic reaction of this enzyme. On the basis of these results, we discussed the processes involved in the substrate-enzyme complexation. The first, the substrate FPP bound to subunit II using Mg2+, followed by the formation of the subunit I-FPP-Mg2+-subunit II complex. Our study showed a very useful methodology for examining the elemental processes of biological reactions such as an enzyme reaction.
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Affiliation(s)
- Takehiro Suzuki
- Institute for Multidisciplinary Research for Advanced Materials, Tohoku University, Aoba-ku, Sendai 980-8577, Japan
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45
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Smith WE, Zukoski CF. Aggregation and gelation kinetics of fumed silica-ethanol suspensions. J Colloid Interface Sci 2006; 304:359-69. [PMID: 17034807 DOI: 10.1016/j.jcis.2006.09.016] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2006] [Revised: 08/11/2006] [Accepted: 09/09/2006] [Indexed: 11/21/2022]
Abstract
The kinetics of aggregation and gelation of fumed silica suspended in ethanol were investigated as a function of volume fraction. At low particle concentrations, gelation is well described by aggregation into a primary minimum arising from hydrogen bonding and dispersion forces. The gelation is extremely slow due to an energetic barrier (approximately 25 kT) in the interparticle potential associated with solvation forces. The solvation forces also contribute to the formation of a secondary minimum in the interparticle potential. The depth of this minimum (approximately 3 kT) is sufficient that, at a critical particle concentration, long-range diffusion is arrested due to the short-range attractions and the cooperative nature of particle interactions, as described by mode coupling theory. The presence of the secondary minimum is also observed in the microstructure of the gels studied using X-ray scattering. These observations reinforce the importance of understanding the role of solvent-particle interactions in manipulating suspension properties.
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Affiliation(s)
- William E Smith
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
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46
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Parida SK, Dash S, Patel S, Mishra BK. Adsorption of organic molecules on silica surface. Adv Colloid Interface Sci 2006; 121:77-110. [PMID: 16879799 DOI: 10.1016/j.cis.2006.05.028] [Citation(s) in RCA: 516] [Impact Index Per Article: 28.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2005] [Revised: 05/17/2006] [Accepted: 05/17/2006] [Indexed: 11/29/2022]
Abstract
The adsorption behaviour of various organic adsorbates on silica surface is reviewed. Most of the structural information on silica is obtained from IR spectral data and from the characteristics of water present at the silica surface. Silica surface is generally embedded with hydroxy groups and ethereal linkages, and hence considered to have a negative charged surface prone to adsorption of electron deficient species. Adsorption isotherms of the adsorbates delineate the nature of binding of the adsorbate with silica. Aromatic compounds are found to involve the pi-cloud in hydrogen bonding with silanol OH group during adsorption. Cationic and nonionic surfactants adsorb on silica surface involving hydrogen bonding. Sometimes, a polar part of the surfactants also contributes to the adsorption process. Styryl pyridinium dyes are found to anchor on silica surface in flat-on position. On modification of the silica by treating with alkali, the adsorption behaviour of cationic surfactant or polyethylene glycol changes due to change in the characteristics of silica or modified silica surface. In case of PEG-modified silica, adsolubilization of the adsorbate is observed. By using a modified adsorption equation, hemimicellization is proposed for these dyes. Adsorptions of some natural macromolecules like proteins and nucleic acids are investigated to study the hydrophobic and hydrophilic binding sites of silica. Artificial macromolecules like synthetic polymers are found to be adsorbed on silica surface due to the interaction of the multifunctional groups of the polymers with silanols. Preferential adsorption of polar adsorbates is observed in case of adsorbate mixtures. When surfactant mixtures are considered to study competitive adsorption on silica surface, critical micelle concentration of individual surfactant also contributes to the adsorption isotherm. The structural study of adsorbed surface and the thermodynamics of adsorption are given some importance in this review.
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Affiliation(s)
- Sudam K Parida
- Centre of Studies in Surface Science and Technology, Department of Chemistry, Jyoti Vihar, 768 019, Orissa, India
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Macrocluster Formation of Alcohol on Silica Surface in Cyclohexane: Analysis of Interfacial Energy between Adsorption Layer and Bulk Solution. E-JOURNAL OF SURFACE SCIENCE AND NANOTECHNOLOGY 2006. [DOI: 10.1380/ejssnt.2006.244] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Aarts IMP, Pipino ACR, Hoefnagels JPM, Kessels WMM, van de Sanden MCM. Quasi-ice monolayer on atomically smooth amorphous SiO2 at room temperature observed with a high-finesse optical resonator. PHYSICAL REVIEW LETTERS 2005; 95:166104. [PMID: 16241820 DOI: 10.1103/physrevlett.95.166104] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2005] [Indexed: 05/05/2023]
Abstract
The structure of an H(2)O monolayer bound to atomically smooth hydroxylated amorphous silica is probed under ambient conditions by near-infrared evanescent-wave cavity ring-down absorption spectroscopy. Employing a miniature monolithic optical resonator, we find sharp (approximately 10 cm(-1)) and polarized (>10:1) vibration-combination bands for surface OH and adsorbed H(2)O, which reveal ordered species in distinct local environments. Indicating first-monolayer uniqueness, the absorption bands for adsorbed H(2)O show intensity saturation and line narrowing with completion of one monolayer. Formation of the ordered H(2)O monolayer likely arises from H bonding to a quasicrystalline surface OH network.
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Affiliation(s)
- I M P Aarts
- Department of Applied Physics, Eindhoven University of Technology, The Netherlands
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Mizukami M, Nakagawa Y, Kurihara K. Surface induced hydrogen-bonded macrocluster formation of methanol on silica surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:9402-5. [PMID: 16207012 DOI: 10.1021/la0512190] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Recently, we have succeeded in identifying the structure of the adsorption layer of ethanol on a silica surface in cyclohexane to be a hydrogen-bonded linear aggregate (polymer), which we call a surface molecular macrocluster. In this work, we studied the effect of the miscibility of liquids on the formation of the surface molecular macroclusters for confirming that this is a surface induced phenomenon. We investigated the interaction and the structure of methanol adsorbed on a silica surface in methanol-cyclohexane binary liquids by a combination of colloidal probe atomic force microscopy, adsorption excess isotherm measurement, and FTIR spectroscopy using the attenuated total reflection (ATR) mode, and compared the results with those of the ethanol-cyclohexane and 1-propanol-cyclohexane binary liquids. The former system is immiscible at methanol concentrations of ca. 8-90 mol %, and the latter two are miscible at any composition. At 0.03 mol % methanol, which is far from the critical concentration for the phase separation, the contact of the methanol macrocluster layers formed on the silica surface brought about the attraction from a distance of 42 +/- 5 nm which was similar to that observed in ethanol-cyclohexane. At a methanol concentration of 9.0 mol %, above bulk phase separation, completely different force profiles were observed. These results demonstrated that the molecular macrocluster formation was different from the wetting induced by the bulk.
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Affiliation(s)
- Masashi Mizukami
- Institute of Multidisciplinary Research for Advanced Material, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan
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Liu W, Zhang L, Shen Y. Interfacial layer structure at alcohol/silica interfaces probed by sum-frequency vibrational spectroscopy. Chem Phys Lett 2005. [DOI: 10.1016/j.cplett.2005.06.113] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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