1
|
An R, Wu N, Gao Q, Dong Y, Laaksonen A, Shah FU, Ji X, Fuchs H. Integrative studies of ionic liquid interface layers: bridging experiments, theoretical models and simulations. NANOSCALE HORIZONS 2024; 9:506-535. [PMID: 38356335 DOI: 10.1039/d4nh00007b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/16/2024]
Abstract
Ionic liquids (ILs) are a class of salts existing in the liquid state below 100 °C, possessing low volatility, high thermal stability as well as many highly attractive solvent and electrochemical capabilities, etc., making them highly tunable for a great variety of applications, such as lubricants, electrolytes, and soft functional materials. In many applications, ILs are first either physi- or chemisorbed on a solid surface to successively create more functional materials. The functions of ILs at solid surfaces can differ considerably from those of bulk ILs, mainly due to distinct interfacial layers with tunable structures resulting in new ionic liquid interface layer properties and enhanced performance. Due to an almost infinite number of possible combinations among the cations and anions to form ILs, the diversity of various solid surfaces, as well as different external conditions and stimuli, a detailed molecular-level understanding of their structure-property relationship is of utmost significance for a judicious design of IL-solid interfaces with appropriate properties for task-specific applications. Many experimental techniques, such as atomic force microscopy, surface force apparatus, and so on, have been used for studying the ion structuring of the IL interface layer. Molecular Dynamics simulations have been widely used to investigate the microscopic behavior of the IL interface layer. To interpret and clarify the IL structure and dynamics as well as to predict their properties, it is always beneficial to combine both experiments and simulations as close as possible. In another theoretical model development to bridge the structure and properties of the IL interface layer with performance, thermodynamic prediction & property modeling has been demonstrated as an effective tool to add the properties and function of the studied nanomaterials. Herein, we present recent findings from applying the multiscale triangle "experiment-simulation-thermodynamic modeling" in the studies of ion structuring of ILs in the vicinity of solid surfaces, as well as how it qualitatively and quantitatively correlates to the overall ILs properties, performance, and function. We introduce the most common techniques behind "experiment-simulation-thermodynamic modeling" and how they are applied for studying the IL interface layer structuring, and we highlight the possibilities of the IL interface layer structuring in applications such as lubrication and energy storage.
Collapse
Affiliation(s)
- Rong An
- Herbert Gleiter Institute of Nanoscience, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
| | - Nanhua Wu
- Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, China
| | - Qingwei Gao
- College of Environmental and Chemical Engineering, Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power, Shanghai 200090, China
| | - Yihui Dong
- Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Aatto Laaksonen
- Energy Engineering, Division of Energy Science, Luleå University of Technology, 97187 Luleå, Sweden.
- Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-10691 Stockholm, Sweden.
- Center of Advanced Research in Bionanoconjugates and Biopolymers, ''Petru Poni" Institute of Macromolecular Chemistry, Iasi 700469, Romania
- State Key Laboratory of Materials-Oriented and Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Faiz Ullah Shah
- Chemistry of Interfaces, Luleå University of Technology, 97187 Luleå, Sweden
| | - Xiaoyan Ji
- Energy Engineering, Division of Energy Science, Luleå University of Technology, 97187 Luleå, Sweden.
| | - Harald Fuchs
- Herbert Gleiter Institute of Nanoscience, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
- Center for Nanotechnology (CeNTech), Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany.
| |
Collapse
|
2
|
Amano KI, Tozawa K, Tomita M, Takagi R, Iwayasu R, Nakano H, Murata M, Abe Y, Utsunomiya T, Sugimura H, Ichii T. Interaction between the substrate and probe in liquid metal Ga: experimental and theoretical analysis. RSC Adv 2023; 13:30615-30624. [PMID: 37859780 PMCID: PMC10582826 DOI: 10.1039/d3ra04459a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Accepted: 10/12/2023] [Indexed: 10/21/2023] Open
Abstract
Interaction between two bodies in a liquid metal is an important topic for development of metallic products with high performance. We conducted atomic force microscopy measurements and achieved the interaction between the substrate and the probe in liquid Ga of an opaque and highly viscous liquid. The interaction cannot be accessed with the normal atomic force microscopy, electron microscopy, and beam reflectometry. We performed a theoretical calculation using statistical mechanics of simple liquids by mixing an experimentally derived quantum effect. From both experiment and theory, we found an unusual behaviour in the interaction between the solvophobic substances, which has never been reported in water and ionic liquids. Shapes of the interaction curves between several solvophobic and solvophilic pairs in liquid Ga are also studied.
Collapse
Affiliation(s)
- Ken-Ichi Amano
- Department of Applied Biological Chemistry, Faculty of Agriculture, Meijo University Nagoya 468-8502 Japan
| | - Kentaro Tozawa
- Department of Applied Biological Chemistry, Faculty of Agriculture, Meijo University Nagoya 468-8502 Japan
| | - Maho Tomita
- Department of Applied Biological Chemistry, Faculty of Agriculture, Meijo University Nagoya 468-8502 Japan
| | - Riko Takagi
- Department of Applied Biological Chemistry, Faculty of Agriculture, Meijo University Nagoya 468-8502 Japan
| | - Rieko Iwayasu
- Department of Applied Biological Chemistry, Faculty of Agriculture, Meijo University Nagoya 468-8502 Japan
| | - Hiroshi Nakano
- Research Center for Computational Design of Advanced Functional Materials, National Institute of Advanced Industrial Science and Technology Tsukuba 305-8568 Japan
| | - Makoto Murata
- Department of Materials Science and Engineering, Kyoto University Kyoto 606-8501 Japan
| | - Yousuke Abe
- Department of Materials Science and Engineering, Kyoto University Kyoto 606-8501 Japan
| | - Toru Utsunomiya
- Department of Materials Science and Engineering, Kyoto University Kyoto 606-8501 Japan
| | - Hiroyuki Sugimura
- Department of Materials Science and Engineering, Kyoto University Kyoto 606-8501 Japan
| | - Takashi Ichii
- Department of Materials Science and Engineering, Kyoto University Kyoto 606-8501 Japan
| |
Collapse
|
3
|
Nagai S, Urata S, Suga K, Fukuma T, Hayashi Y, Miyazawa K. Three-dimensional ordering of water molecules reflecting hydroxyl groups on sapphire (001) and α-quartz (100) surfaces. NANOSCALE 2023; 15:13262-13271. [PMID: 37539559 DOI: 10.1039/d3nr02498a] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/05/2023]
Abstract
Water molecules on oxide surfaces influence the chemical reactivity and molecular adsorption behavior of oxides. Herein, three-dimensional atomic force microscopy (3D-AFM) and molecular dynamics simulations are used to visualize the surface hydroxyl (OH) groups and their hydration structures on sapphire (001) and α-quartz (100) surfaces at the atomic-scale. The obtained results revealed that the spatial density distributions and hydrogen-bonding strengths of surface OH groups affect their local hydration structures. In particular, the force curves obtained by 3D-AFM suggest that the hydration forces of water molecules intensify at sites where water molecules strongly interact with the surface OH groups. The insights obtained in this study deepen our understanding of the affinities of Al2O3 and SiO2 for water molecules and contribute to the use of 3D-AFM in the investigation of atomic-scale hydration structures on various surfaces, thereby benefiting a wide range of research fields dealing with solid-liquid interfaces.
Collapse
Affiliation(s)
- Sho Nagai
- Innovative Technology Laboratories, AGC Inc., 1-1 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
| | - Shingo Urata
- Planning Division, AGC Inc., 1-1 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
| | - Kent Suga
- Innovative Technology Laboratories, AGC Inc., 1-1 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
| | - Takeshi Fukuma
- Faculty of Frontier Engineering, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan.
- Nano Life Science Institute (WPI-NanoLSI), Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
| | - Yasuo Hayashi
- Innovative Technology Laboratories, AGC Inc., 1-1 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
| | - Keisuke Miyazawa
- Faculty of Frontier Engineering, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan.
- Nano Life Science Institute (WPI-NanoLSI), Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
| |
Collapse
|
4
|
Hashimoto K, Amano KI, Nishi N, Onishi H, Sakka T. Comparison of atomic force microscopy force curve and solvation structure studied by integral equation theory. J Chem Phys 2021; 154:164702. [PMID: 33940841 DOI: 10.1063/5.0046600] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Atomic force microscopy can observe structures of liquids (solvents) on solid surfaces as oscillating force curves. The oscillation originates from the solvation force, which is affected by the interaction between the probe, substrate, and solvents. To investigate the effects of the interactions on the force curve, we calculated the force curves by integral equation theory with various probe and substrate conditions. The probe solvophilicity affected the force curves more than the substrate solvophilicity in our calculation, and its reason is qualitatively explained by the amount of the desolvated solvents. We evaluated the probes and parameters in terms of the qualitative estimation of the number density distribution of the solvent on the wall. The negative of the force curve's derivative with respect to the surface separation reflected the number density distribution better than the force curve. This parameter is based on the method that is proposed previously by Amano et al. [Phys. Chem. Chem. Phys. 18, 15534 (2016)]. The normalized frequency shift can also be used for the qualitative estimation of the number density distribution if the cantilever amplitude is small. Solvophobic probes reflected the number density distribution better than the solvophilic probes. Solvophilic probes resulted in larger oscillation amplitudes than solvophobic probes and are suitable for measurements with a high S/N ratio.
Collapse
Affiliation(s)
- Kota Hashimoto
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Ken-Ichi Amano
- Faculty of Agriculture, Meijo University, 1-501 Shiogamaguchi, Tenpaku, Nagoya 468-8502, Japan
| | - Naoya Nishi
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Hiroshi Onishi
- Department of Chemistry, Graduate School of Science, Kobe University, Nada, Kobe, Hyogo 657-8501, Japan
| | - Tetsuo Sakka
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| |
Collapse
|
5
|
Calculation method of the number density distribution of liquid molecules or colloidal particles near a substrate from surface force apparatus measurement. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2020.137666] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
6
|
Subnanometer-scale imaging of nanobio-interfaces by frequency modulation atomic force microscopy. Biochem Soc Trans 2020; 48:1675-1682. [PMID: 32779720 DOI: 10.1042/bst20200155] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Revised: 07/15/2020] [Accepted: 07/17/2020] [Indexed: 11/17/2022]
Abstract
Recently, there have been significant advancements in dynamic-mode atomic force microscopy (AFM) for biological applications. With frequency modulation AFM (FM-AFM), subnanometer-scale surface structures of biomolecules such as secondary structures of proteins, phosphate groups of DNAs, and lipid-ion complexes have been directly visualized. In addition, three-dimensional AFM (3D-AFM) has been developed by combining a high-resolution AFM technique with a 3D tip scanning method. This method enabled visualization of 3D distributions of water (i.e. hydration structures) with subnanometer-scale resolution on various biological molecules such as lipids, proteins, and DNAs. Furthermore, 3D-AFM also allows visualization of subnanometer-scale 3D distributions of flexible surface structures such as thermally fluctuating lipid headgroups. Such a direct local information at nano-bio interfaces can play a critical role in determining the atomic- or molecular-scale model to explain interfacial structures and functions. Here, we present an overview of these recent advancements in the dynamic-mode AFM techniques and their biological applications.
Collapse
|
7
|
Integral equation theory based method to determine number density distribution of colloidal particles near a substrate using a force curve from colloidal probe atomic force microscopy. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.111584] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
8
|
Enhancement of stratification of colloidal particles near a substrate induced by addition of non-adsorbing polymers. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.136705] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
9
|
Zhang Z, Ryu S, Ahn Y, Jang J. Molecular features of hydration layers probed by atomic force microscopy. Phys Chem Chem Phys 2018; 20:30492-30501. [PMID: 30511076 DOI: 10.1039/c8cp06126b] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Structurally-ordered layers of water are universally formed on a solid surface in aqueous solution or under ambient conditions. Although such hydration layers are commonly probed via atomic force microscopy (AFM), the current understanding on how the hydration layers manifest themselves in an AFM experiment is far from complete. By using molecular dynamics simulation, we investigate the hydration layers on a hydrophilic or hydrophobic surface probed by a nanoscale tip. We study the density and molecular orientation of water, the free energy, and the force on the tip by varying the tip-surface distance. The force-distance curve oscillates due to the transition between the mono-, bi-, and tri-layers of water confined between the tip and the surface. If both the tip and the surface are hydrophobic, water confined between the tip and the surface evaporates due to the dewetting transition, giving a hydrophobic force without oscillation. The periodicity of oscillation in the force differs from the structural periodicity of water. With a close proximity of the tip, the molecular dipoles align parallel to the surface, regardless of whether the tip and the surface are hydrophilic or hydrophobic.
Collapse
Affiliation(s)
- Zhengqing Zhang
- Department of Nanoenergy Engineering, Pusan National University, Busan 46241, South Korea.
| | | | | | | |
Collapse
|
10
|
Amano KI, Ishihara T, Hashimoto K, Ishida N, Fukami K, Nishi N, Sakka T. Stratification of Colloidal Particles on a Surface: Study by a Colloidal Probe Atomic Force Microscopy Combined with a Transform Theory. J Phys Chem B 2018; 122:4592-4599. [PMID: 29611708 DOI: 10.1021/acs.jpcb.8b01082] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Colloidal probe atomic force microscopy (CP-AFM) can be used for measuring force curves between the colloidal probe and the substrate in a colloidal suspension. In the experiment, an oscillatory force curve reflecting the layer structure of the colloidal particles on the substrate is usually obtained. However, the force curve is not equivalent to the interfacial structure of the colloidal particles. In this paper, the force curve is transformed into the number density distribution of the colloidal particles as a function of the distance from the substrate surface using our newly developed transform theory. It is found by the transform theory that the interfacial stratification is enhanced by an increase in an absolute value of the surface potential of the colloidal particle, despite a simultaneous increase in a repulsive electrostatic interaction between the substrate and the colloidal particle. To elucidate the mechanism of the stratification, an integral equation theory is employed. It is found that crowding of the colloidal particles in the bulk due to the increase in the absolute value of the surface potential of the colloidal particle leads to pushing out some colloidal particles to the wall. The combined method of CP-AFM and the transform theory (the experimental-theoretical study of the interfacial stratification) is related to colloidal crystallization, glass transition, and aggregation on a surface. Thus, the combined method is important for developments of colloidal nanotechnologies.
Collapse
Affiliation(s)
- Ken-Ichi Amano
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering , Kyoto University , Kyoto 615-8510 , Japan
| | - Taira Ishihara
- 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
| | - Naoyuki Ishida
- Division of Applied Chemistry, Graduate School of Natural Science and Technology , Okayama University , Okayama 700-8530 , Japan
| | - Kazuhiro Fukami
- Department of Materials Science and Engineering, Graduate School of Engineering , Kyoto University , Kyoto 606-8501 , 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
| |
Collapse
|
11
|
Yu Z, Zhang F, Huang J, Sumpter BG, Qiao R. Ionic liquids-mediated interactions between nanorods. J Chem Phys 2017; 147:134704. [PMID: 28987112 DOI: 10.1063/1.5005541] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Surface forces mediated by room-temperature ionic liquids (RTILs) play an essential role in diverse applications including self-assembly, lubrication, and electrochemical energy storage. Therefore, their fundamental understanding is critical. Using molecular simulations, we study the interactions between two nanorods immersed in model RTILs at rod-rod separations where both structural and double layer forces are important. The interaction force between neutral rods oscillates as the two rods approach each other, similar to the classical structural forces. Such oscillatory force originates from the density oscillation of RTILs near each rod and is affected by the packing constraints imposed by the neighboring rods. The oscillation period and decay length of the oscillatory force are mainly dictated by the ion density distribution near isolated nanorods. When charges are introduced on the rods, the interaction force remains short-range and oscillatory, similar to the interactions between planar walls mediated by some protic RTILs reported earlier. Nevertheless, introducing net charges to the rods greatly changes the rod-rod interactions, e.g., by delaying the appearance of the first force trough and increasing the oscillation period and decay length of the interaction force. The oscillation period and decay length of the oscillatory force and free energy are commensurate with those of the space charge density near an isolated, charged rod. The free energy of rod-rod interactions reaches local minima (maxima) at rod-rod separations when the space charges near the two rods interfere constructively (destructively). The insight on the short-range interactions between nanorods in RTILs helps guide the design of novel materials, e.g., ionic composites based on rigid-rod polyanions and RTILs.
Collapse
Affiliation(s)
- Zhou Yu
- Department of Mechanical Engineering, Virginia Tech, Blacksburg, Virginia 24061, USA
| | - Fei Zhang
- Department of Mechanical Engineering, Virginia Tech, Blacksburg, Virginia 24061, USA
| | - Jingsong Huang
- Center for Nanophase Materials Sciences and Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Bobby G Sumpter
- Center for Nanophase Materials Sciences and Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Rui Qiao
- Department of Mechanical Engineering, Virginia Tech, Blacksburg, Virginia 24061, USA
| |
Collapse
|
12
|
Söngen H, Marutschke C, Spijker P, Holmgren E, Hermes I, Bechstein R, Klassen S, Tracey J, Foster AS, Kühnle A. Chemical Identification at the Solid-Liquid Interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:125-129. [PMID: 27960056 DOI: 10.1021/acs.langmuir.6b03814] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Solid-liquid interfaces are decisive for a wide range of natural and technological processes, including fields as diverse as geochemistry and environmental science as well as catalysis and corrosion protection. Dynamic atomic force microscopy nowadays provides unparalleled structural insights into solid-liquid interfaces, including the solvation structure above the surface. In contrast, chemical identification of individual interfacial atoms still remains a considerable challenge. So far, an identification of chemically alike atoms in a surface alloy has only been demonstrated under well-controlled ultrahigh vacuum conditions. In liquids, the recent advent of three-dimensional force mapping has opened the potential to discriminate between anionic and cationic surface species. However, a full chemical identification will also include the far more challenging situation of alike interfacial atoms (i.e., with the same net charge). Here we demonstrate the chemical identification capabilities of dynamic atomic force microscopy at solid-liquid interfaces by identifying Ca and Mg cations at the dolomite-water interface. Analyzing site-specific vertical positions of hydration layers and comparing them with molecular dynamics simulations unambiguously unravels the minute but decisive difference in ion hydration and provides a clear means for telling calcium and magnesium ions apart. Our work, thus, demonstrates the chemical identification capabilities of dynamic AFM at the solid-liquid interface.
Collapse
Affiliation(s)
- Hagen Söngen
- Institute of Physical Chemistry, Johannes Gutenberg University Mainz , Duesbergweg 10-14, 55099 Mainz, Germany
- Graduate School Materials Science in Mainz , Staudingerweg 9, 55128 Mainz, Germany
| | - Christoph Marutschke
- Institute of Physical Chemistry, Johannes Gutenberg University Mainz , Duesbergweg 10-14, 55099 Mainz, Germany
| | - Peter Spijker
- COMP Centre of Excellence, Department of Applied Physics, Aalto University , Helsinki FI-00076, Finland
| | - Eric Holmgren
- University of Rochester , Rochester, New York 14627, United States
| | - Ilka Hermes
- Institute of Physical Chemistry, Johannes Gutenberg University Mainz , Duesbergweg 10-14, 55099 Mainz, Germany
| | - Ralf Bechstein
- Institute of Physical Chemistry, Johannes Gutenberg University Mainz , Duesbergweg 10-14, 55099 Mainz, Germany
| | - Stefanie Klassen
- Institute of Physical Chemistry, Johannes Gutenberg University Mainz , Duesbergweg 10-14, 55099 Mainz, Germany
| | - John Tracey
- COMP Centre of Excellence, Department of Applied Physics, Aalto University , Helsinki FI-00076, Finland
| | - Adam S Foster
- COMP Centre of Excellence, Department of Applied Physics, Aalto University , Helsinki FI-00076, Finland
- Division of Electrical Engineering and Computer Science, Kanazawa University , Kanazawa 920-1192, Japan
| | - Angelika Kühnle
- Institute of Physical Chemistry, Johannes Gutenberg University Mainz , Duesbergweg 10-14, 55099 Mainz, Germany
| |
Collapse
|
13
|
Amano KI, Yokota Y, Ichii T, Yoshida N, Nishi N, Katakura S, Imanishi A, Fukui KI, Sakka T. A relationship between the force curve measured by atomic force microscopy in an ionic liquid and its density distribution on a substrate. Phys Chem Chem Phys 2017; 19:30504-30512. [DOI: 10.1039/c7cp06948k] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A relationship between the force curve measured in an ionic liquid and the solvation structure is studied. Applying the obtained relationship, candidates of the solvation structure are estimated from a measured force curve.
Collapse
Affiliation(s)
- Ken-ichi Amano
- Department of Energy and Hydrocarbon Chemistry
- Graduate School of Engineering
- Kyoto University
- Kyoto 615-8510
- Japan
| | - Yasuyuki Yokota
- Surface and Interface Science Laboratory
- RIKEN
- Saitama 351-0198
- Japan
| | - Takashi Ichii
- Department of Materials Science and Engineering
- Kyoto University
- Kyoto
- Japan
| | - Norio Yoshida
- Department of Chemistry, Graduate School of Science
- Kyushu University
- Fukuoka 819-0395
- Japan
| | - Naoya Nishi
- Department of Energy and Hydrocarbon Chemistry
- Graduate School of Engineering
- Kyoto University
- Kyoto 615-8510
- Japan
| | - Seiji Katakura
- Department of Energy and Hydrocarbon Chemistry
- Graduate School of Engineering
- Kyoto University
- Kyoto 615-8510
- Japan
| | - Akihito Imanishi
- Department of Materials Engineering Science
- Graduate School of Engineering Science
- Osaka University
- 1-3 Machikaneyama
- Toyonaka
| | - Ken-ichi Fukui
- Department of Materials Engineering Science
- Graduate School of Engineering Science
- Osaka University
- 1-3 Machikaneyama
- Toyonaka
| | - Tetsuo Sakka
- Department of Energy and Hydrocarbon Chemistry
- Graduate School of Engineering
- Kyoto University
- Kyoto 615-8510
- Japan
| |
Collapse
|
14
|
Amano KI, Iwaki M, Hashimoto K, Fukami K, Nishi N, Takahashi O, Sakka T. Number Density Distribution of Small Particles around a Large Particle: Structural Analysis of a Colloidal Suspension. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:11063-11070. [PMID: 27683951 DOI: 10.1021/acs.langmuir.6b02628] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Some colloidal suspensions contain two types of particles-small and large particles-to improve the lubricating ability, light absorptivity, and so forth. Structural and chemical analyses of such colloidal suspensions are often performed to understand their properties. In a structural analysis study, the observation of the number density distribution of small particles around a large particle (gLS) is difficult because these particles are randomly moving within the colloidal suspension by Brownian motion. We obtain gLS using the data from a line optical tweezer (LOT) that can measure the potential of mean force between two large colloidal particles (ΦLL). We propose a theory that transforms ΦLL into gLS. The transform theory is explained in detail and tested. We demonstrate for the first time that LOT can be used for the structural analysis of a colloidal suspension. LOT combined with the transform theory will facilitate structural analyses of the colloidal suspensions, which is important for both understanding colloidal properties and developing colloidal products.
Collapse
Affiliation(s)
- Ken-Ichi Amano
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University , Kyoto 615-8510, Japan
| | - Mitsuhiro Iwaki
- Quantitative Biology Center, RIKEN , Suita, Osaka 565-0874, Japan
- Graduate School of Frontier Biosciences, Osaka University , Suita, Osaka 565-0874, Japan
| | - Kota Hashimoto
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University , Kyoto 615-8510, Japan
| | - Kazuhiro Fukami
- Department of Materials Science and Engineering, Graduate School of Engineering, Kyoto University , Kyoto 606-8501, Japan
| | - Naoya Nishi
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University , Kyoto 615-8510, Japan
| | - Ohgi Takahashi
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University , Sendai 981-8558, Japan
| | - Tetsuo Sakka
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University , Kyoto 615-8510, Japan
| |
Collapse
|