1
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Yang P, Kumarasiri A, Hore D. Surface populations as a model for the distance-dependence of the interfacial refractive index. J Chem Phys 2024; 161:054703. [PMID: 39087546 DOI: 10.1063/5.0221234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2024] [Accepted: 07/16/2024] [Indexed: 08/02/2024] Open
Abstract
Vibrational sum frequency spectra provide information about interfaces that is sensitive to the orientation of molecules, their electronic environment, and the local electric fields. Here, we use molecular dynamics simulations in order to study a surfactant, para-cyanophenol, at the air-water interface. The volume fractions of water and the organic surfactant are considered at various points over the nanometer-scale region in a Lorentz-Lorenz model. We find that the calculated ratios of nonlinear susceptibility tensor elements are in agreement with experimental data only when this depth profile was considered. We also use these data to evaluate the ratio of the C-N hyperpolarizability tensor elements in the interfacial region.
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Affiliation(s)
- Peter Yang
- Department of Chemistry, University of Victoria, Victoria, British Columbia V8W 3V6, Canada
| | - Aruna Kumarasiri
- Department of Chemistry, University of Victoria, Victoria, British Columbia V8W 3V6, Canada
| | - Dennis Hore
- Department of Chemistry, University of Victoria, Victoria, British Columbia V8W 3V6, Canada
- Department of Computer Science, University of Victoria, Victoria, British Columbia V8W 3P6, Canada
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2
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Zhang T, Gai K, Li R, Liang Y, Li L, Chen J, Nie M. Robust and self-lubricating polyvinyl alcohol tubes with a mucosa-like hierarchical architecture for endotracheal intubation. J Mater Chem B 2024; 12:1330-1343. [PMID: 38230443 DOI: 10.1039/d3tb02402d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2024]
Abstract
Mechanical mismatch between interventional intubation tubes and human tissues often triggers inevitable friction and causes secondary injury to patients during interventional therapy. Herein, we propose a fabrication strategy of a self-lubricating polyvinyl alcohol (PVA) tube by industrial extrusion technology followed by simple infiltration with water. First, biocompatible glycerin was introduced to weaken the intrinsic hydrogen interaction of PVA by new molecular complexation, broadening the gap between the melting and decomposition temperatures and enabling the stable extrusion of the PVA tube. Subsequently, the as-prepared PVA tube was infiltrated with an aqueous solution to construct a strong hydrogen bonding network between PVA and water molecules, forming a soft hydration layer similar to the upper epithelium layer of mucosa. Benefiting from the solid and liquid properties of the hydration layer as well as the small proportion relative to the whole, the infiltrated PVA tube exhibited excellent hydration lubrication behavior and robust mechanical property. The friction coefficient, tensile strength and elongation at break were measured to be 0.05, 26.2 MPa and 654%, respectively, surpassing the values of 0.5, 16.4 MPa and 240% observed in a commercial polyvinyl chloride tube. In vitro, the PVA intubation tube demonstrated significant biocompatibility, and short-term exposure exhibited minimal impacts on the morphology and proliferation of L929 cells. Ultimately, the potential of the infiltrated PVA tube for interventional intubation was demonstrated successfully using an in vivo rabbit model, providing a new idea for the follow-up development of interventional intubation tubes.
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Affiliation(s)
- Tongrui Zhang
- State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases & Department of Prosthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, Sichuan, China.
| | - Kuo Gai
- State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases & Department of Prosthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, Sichuan, China.
| | - Ruyi Li
- State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases & Department of Prosthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, Sichuan, China.
| | - Yi Liang
- State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases & Department of Prosthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, Sichuan, China.
| | - Li Li
- State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases & Department of Prosthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, Sichuan, China.
| | - Junyu Chen
- State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases & Department of Prosthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, Sichuan, China.
| | - Min Nie
- State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases & Department of Prosthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, Sichuan, China.
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3
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Mendes GR, Modenez IDA, Cagnani GR, Colombo RNP, Crespilho FN. Exploring Enzymatic Conformational Dynamics at Surfaces through μ-FTIR Spectromicroscopy. Anal Chem 2023; 95:11254-11262. [PMID: 37459476 DOI: 10.1021/acs.analchem.3c00872] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/02/2023]
Abstract
Immobilization of proteins onto solid supports has critical industrial, technological, and medical applications, and is a daily task in chemical research. Significant conformational rearrangements often occur due to enzyme-surface interactions, and it is of broad interest to develop methods to probe and better understand these molecular-level changes that contribute to the enzyme's catalytic activity and stability. While circular dichroism is a common method for solution-phase conformational study, the application to surface-supported proteins is not trivial and spatial mapping is not viable. On the other hand, a nonlinear laser spectroscopy technique used to analyze surfaces and interfaces is not often found in most laboratories, therefore requiring an alternative and reliable method. Here, we employed high-dimensional data spectromicroscopy analysis in the infrared region (μ-FTIR) to investigate the enzyme's conformational change when adsorbed onto solid matrices, across a ca. 20 mm2 area. Alcohol dehydrogenase (ADH) enzyme was adopted as a model enzyme to interact with CaF2, Au, and Au-thiol model substrates, strategically chosen for mapping the enzyme dynamics on solid surfaces with different polarity/hydrophobicity properties and extendable to other materials. Two-dimensional chemical maps indicate that the enzyme adsorbs with different patterns in which secondary structures dynamically adjust to optimize interprotein and enzyme-surface interactions. The results suggest an experimental approach to identify and map enzyme conformational dynamics onto different solid surfaces across space and provide insights into immobilized protein structure investigations for areas such as biosensing and bioenergy.
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Affiliation(s)
- Giovana Rossi Mendes
- São Carlos Institute of Chemistry, University of São Paulo, São Carlos 13560-970, Brazil
| | - Iago de Assis Modenez
- São Carlos Institute of Chemistry, University of São Paulo, São Carlos 13560-970, Brazil
| | - Giovana Rosso Cagnani
- São Carlos Institute of Chemistry, University of São Paulo, São Carlos 13560-970, Brazil
| | - Rafael N P Colombo
- São Carlos Institute of Chemistry, University of São Paulo, São Carlos 13560-970, Brazil
| | - Frank Nelson Crespilho
- São Carlos Institute of Chemistry, University of São Paulo, São Carlos 13560-970, Brazil
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4
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Akada K, Yamazoe K, Miyawaki J, Maeda R, Ito K, Harada Y. Hydrogen-Bonded Structure of Water in the Loop of Anchored Polyrotaxane Chain Controlled by Anchoring Density. Front Chem 2021; 9:743255. [PMID: 34765585 PMCID: PMC8577270 DOI: 10.3389/fchem.2021.743255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2021] [Accepted: 09/27/2021] [Indexed: 11/28/2022] Open
Abstract
Hydrogen-bonded network of water surrounding polymers is expected to be one of the most relevant factors affecting biocompatibility, while the specific hydrogen-bonded structure of water responsible for biocompatibility is still under debate. Here we study the hydrogen-bonded structure of water in a loop-shaped poly(ethylene glycol) chain in a polyrotaxane using synchrotron soft X-ray emission spectroscopy. By changing the density of anchoring molecules, hydrogen-bonded structure of water confined in the poly(ethylene glycol) loop was identified. The XES profile of the confined water indicates the absence of the low energy lone-pair peak, probably because the limited space of the polymer loop entropically inhibits the formation of tetrahedrally coordinated water. The volume of the confined water can be changed by the anchoring density, which implies the ability to control the biocompatibility of loop-shaped polymers.
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Affiliation(s)
- Keishi Akada
- Institute for Solid State Physics (ISSP), The University of Tokyo, Chiba, Japan
| | - Kosuke Yamazoe
- Institute for Solid State Physics (ISSP), The University of Tokyo, Chiba, Japan
| | - Jun Miyawaki
- Institute for Solid State Physics (ISSP), The University of Tokyo, Chiba, Japan.,Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, Chiba, Japan.,Synchrotron Radiation Research Organization, The University of Tokyo, Chiba, Japan
| | - Rina Maeda
- Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, Chiba, Japan
| | - Kohzo Ito
- Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, Chiba, Japan
| | - Yoshihisa Harada
- Institute for Solid State Physics (ISSP), The University of Tokyo, Chiba, Japan.,Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, Chiba, Japan.,Synchrotron Radiation Research Organization, The University of Tokyo, Chiba, Japan
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5
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Messina GML, Mazzuca C, Dettin M, Zamuner A, Di Napoli B, Ripani G, Marletta G, Palleschi A. From nanoaggregates to mesoscale ribbons: the multistep self-organization of amphiphilic peptides. NANOSCALE ADVANCES 2021; 3:3605-3614. [PMID: 36133720 PMCID: PMC9418424 DOI: 10.1039/d1na00216c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Accepted: 04/27/2021] [Indexed: 06/16/2023]
Abstract
This paper reports atomic force microscopy results and molecular dynamics simulations of the striking differences of long-term self-organization structures of negatively charged (AcA4)2KD (double tail) and AcA4D (single tail) peptides, respectively, forming micrometer-long, linearly ordered ribbon-like structures and nanometer-sized, unstructured, round-shaped aggregates. The subsequent formation steps of the long-range nanoribbons, experimentally observed only for the "double tail" (AcA4)2KD peptide, are analyzed in detail, showing that the initial "primary" unstructured round-shaped aggregates progressively evolve into longer nanofilaments and into micrometer-long, network-forming nanoribbon moieties. In particular, the long-range self-organization of the "double tail" peptides appears to be closely related to electrostatically driven diffusional motions of the primary aggregates and nanofilaments. The diffusional freedom degrees are prompted by the formation of a dynamic ternary air/liquid/substrate interface, due to the water evaporation process from the ultrathin films of the peptide solution cast onto a solid mica substrate. Overall, the initial aggregation of unstructured round-shaped moieties, for both the peptides, can be seen as an entropy-driven process, involving the intra- and intermolecular interactions of hydrophobic parts of the peptides, while the further formation of long nanoribbons, only for "double tail" peptides, can be viewed in terms of an enthalpy-driven process, mainly due to the predominant electrostatic interactions between the charged heads of the interacting peptides. The role of the solid-liquid interface, as the locus of the enthalpy-driven linear organization, is also highlighted.
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Affiliation(s)
- Grazia M L Messina
- Laboratory for Molecular Surfaces and Nanotechnology (LAMSUN), Department of Chemical Sciences, University of Catania, CSGI Viale A. Doria 6 I-95125 Catania Italy
| | - Claudia Mazzuca
- Department of Chemical Science and Technologies, University of Rome "Tor Vergata" Via della Ricerca Scientifica 1 00133 Rome Italy
| | - Monica Dettin
- Department of Industrial Engineering, University of Padova Padova Italy
| | - Annj Zamuner
- Department of Industrial Engineering, University of Padova Padova Italy
| | - Benedetta Di Napoli
- Department of Chemical Science and Technologies, University of Rome "Tor Vergata" Via della Ricerca Scientifica 1 00133 Rome Italy
| | - Giorgio Ripani
- Department of Chemical Science and Technologies, University of Rome "Tor Vergata" Via della Ricerca Scientifica 1 00133 Rome Italy
| | - Giovanni Marletta
- Laboratory for Molecular Surfaces and Nanotechnology (LAMSUN), Department of Chemical Sciences, University of Catania, CSGI Viale A. Doria 6 I-95125 Catania Italy
| | - Antonio Palleschi
- Department of Chemical Science and Technologies, University of Rome "Tor Vergata" Via della Ricerca Scientifica 1 00133 Rome Italy
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6
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Lecot S, Lavigne A, Yang Z, Chevolot Y, Phaner-Goutorbe M, Yeromonahos C. Effects of the Chemical and Structural Properties of Silane Monolayers on the Organization of Water Molecules and Ions at Interfaces, from Molecular Dynamics Simulations. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:5563-5572. [PMID: 33914530 DOI: 10.1021/acs.langmuir.1c00338] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Understanding the organization of the hydration layer at functionalized silica surfaces is relevant for a large range of biosensing applications or surface phenomena such as biomolecule adsorption. Silane monolayers are widely used to functionalize silica surfaces. Using molecular dynamics simulations, we have investigated the role of silane molecule head-group charge, alkyl chain length, and surface coverage in the structural organization and dynamic properties of Na+ ions, Cl- ions, and water molecules at the interface. The silane molecules studied are 3-aminopropyldimethylethoxysilane, n-propyldimethylmethoxysilane, octadecyldimethylmethoxysilane, and (dimethylamino)dimethylsilylundecanoate. Our results suggest that the distribution of interfacial ions is sensitive to the 2D dispersion of the silane-charged head groups. Also, while charged silane monolayers show a strong orientation of interfacial water molecules, which leads to a rupture in the hydrogen bond network and disturbs their tetrahedral organization, the arrangement of water molecules at the interface with uncharged silane monolayers seems to be related to the surface roughness and to alkyl chain length. In line with these results, the diffusion of ions and water molecules is higher at the CH3 long monolayer interface than at the CH3 short monolayer interface and at the charged monolayer interfaces. Also, whatever the silane molecules studied, bulk properties are recovered around 0.7 nm above the interface. The interfacial water organization is known to impact biomolecule adsorption. Therefore, these results could further help in optimizing the functionalization layers to capture analytes.
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Affiliation(s)
- Solène Lecot
- Université de Lyon, Ecole Centrale de Lyon, CNRS, INSA Lyon, Université Claude Bernard Lyon 1, CPE Lyon, CNRS, INL, UMR5270, 69130 Ecully, France
| | - Antonin Lavigne
- Université de Lyon, Ecole Centrale de Lyon, CNRS, INSA Lyon, Université Claude Bernard Lyon 1, CPE Lyon, CNRS, INL, UMR5270, 69130 Ecully, France
| | - Zihua Yang
- Université de Lyon, Ecole Centrale de Lyon, CNRS, INSA Lyon, Université Claude Bernard Lyon 1, CPE Lyon, CNRS, INL, UMR5270, 69130 Ecully, France
| | - Yann Chevolot
- Université de Lyon, Ecole Centrale de Lyon, CNRS, INSA Lyon, Université Claude Bernard Lyon 1, CPE Lyon, CNRS, INL, UMR5270, 69130 Ecully, France
| | - Magali Phaner-Goutorbe
- Université de Lyon, Ecole Centrale de Lyon, CNRS, INSA Lyon, Université Claude Bernard Lyon 1, CPE Lyon, CNRS, INL, UMR5270, 69130 Ecully, France
| | - Christelle Yeromonahos
- Université de Lyon, Ecole Centrale de Lyon, CNRS, INSA Lyon, Université Claude Bernard Lyon 1, CPE Lyon, CNRS, INL, UMR5270, 69130 Ecully, France
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7
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Zhang C, Adera S, Aizenberg J, Chen Z. Why Are Water Droplets Highly Mobile on Nanostructured Oil-Impregnated Surfaces? ACS APPLIED MATERIALS & INTERFACES 2021; 13:15901-15909. [PMID: 33754694 DOI: 10.1021/acsami.1c01649] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Porous lubricated surfaces (aka slippery liquid-infused porous surfaces, SLIPS) have been demonstrated to repel various liquids. The origin of this repellency, however, is not fully understood. By using surface-sensitive sum frequency generation vibrational spectroscopy, we characterized the water/oil interface of a water droplet residing on (a) an oil-impregnated nanostructured surface (SLIPS) and (b) the same oil layer without the underlying nanostructures. Different from water molecules in contact with bulk oil without nanostructures, droplets on SLIPS adopt a molecular orientation that is predominantly parallel to the water/oil interface, leading to weaker hydrogen bonding interactions between water droplets and the lubrication film, giving SLIPS their water repellency. Our results demonstrate that the molecular interactions between two contacting liquids can be manipulated by the implementation of nanostructured substrates. The results also offer the molecular principles for controlling nanostructure to reduce oil depletion-one of the limitations and major concerns of SLIPS.
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Affiliation(s)
- Chengcheng Zhang
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48103, United States
| | - Solomon Adera
- Department of Mechanical Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States
| | | | - Zhan Chen
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48103, United States
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8
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Zhao D, Wang Y, Su Q, Li L, Zhou J. Lysozyme Adsorption on Porous Organic Cages: A Molecular Simulation Study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:12299-12308. [PMID: 32988201 DOI: 10.1021/acs.langmuir.0c02233] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Recently, porous organic cages (POCs) have emerged as a novel porous material with many merits and are widely utilized in many application fields. In this work, for the first time, molecular dynamics simulations were performed to investigate the mechanism of lysozyme adsorption onto the CC3 crystal, a kind of widely studied POC material. The simulation results show that lysozyme adsorbs onto the surface of CC3 with "top end-on," "back-on," or "side-on" orientations. It is found that the van der Waals interaction is the primary contribution to the binding; the conformation of the lysozyme is well preserved during the adsorption process. This provides some evidence for its biocompatibility and feasibility in biorelated applications. Arginine plays an important role in mediating the adsorption through nonpolar aliphatic chains. More importantly, the distribution and structure of the water layer on the POC surface has a significant impact on adsorption. This study provides insights into the development of POC materials with defined morphologies for the adsorption of biomolecules and may help the rational design of biorelated systems.
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Affiliation(s)
- Daohui Zhao
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, School of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, P.R. China
- School of Chemistry and Chemical Engineering, Guangdong Provincial Key Lab for Green Chemical Product Technology, South China University of Technology, Guangzhou 510640, P. R. China
| | - Yuqing Wang
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, School of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, P.R. China
| | - Qianwen Su
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, School of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, P.R. China
| | - Libo Li
- School of Chemistry and Chemical Engineering, Guangdong Provincial Key Lab for Green Chemical Product Technology, South China University of Technology, Guangzhou 510640, P. R. China
| | - Jian Zhou
- School of Chemistry and Chemical Engineering, Guangdong Provincial Key Lab for Green Chemical Product Technology, South China University of Technology, Guangzhou 510640, P. R. China
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9
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Tomar D, Rana B, Jena KC. The structure of water–DMF binary mixtures probed by linear and nonlinear vibrational spectroscopy. J Chem Phys 2020; 152:114707. [DOI: 10.1063/1.5141757] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Affiliation(s)
- Deepak Tomar
- Department of Physics, Indian Institute of Technology Ropar, Rupnagar, Punjab 140001, India
| | - Bhawna Rana
- Department of Physics, Indian Institute of Technology Ropar, Rupnagar, Punjab 140001, India
| | - Kailash C. Jena
- Department of Physics, Indian Institute of Technology Ropar, Rupnagar, Punjab 140001, India
- Center for Biomedical Engineering, Indian Institute of Technology Ropar, Rupnagar, Punjab 140001, India
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10
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Perets EA, Yan ECY. Chiral Water Superstructures around Antiparallel β-Sheets Observed by Chiral Vibrational Sum Frequency Generation Spectroscopy. J Phys Chem Lett 2019; 10:3395-3401. [PMID: 31070921 PMCID: PMC9059516 DOI: 10.1021/acs.jpclett.9b00878] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Hydration modulates every aspect of protein structure and function. However, studying water structures in hydration shells remains challenging mostly due to overwhelming background from bulk water. We used vibrational sum frequency generation (SFG) spectroscopy to characterize hydrated films of an antiparallel β-sheet peptide (LK7β) adsorbed on glass slides. The hydrated films give chiral SFG response from water only when the peptide self-assembles into antiparallel β-sheets. Experiments of isotopic labeling, isotopic dilution of water, and H2O-D2O exchange kinetics corroborate the assignments of the chiral SFG response to water stretching modes. Because individual water molecules are achiral, the chiral SFG response indicates formation of chiral superstructures of water around the antiparallel β-sheet, implying that a protein secondary structure can imprint its chirality onto the surrounding water. This result demonstrates chiral SFG spectroscopy as a promising tool for probing water structures in protein hydration and addressing fundamental questions of protein structure-function.
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Affiliation(s)
- Ethan A. Perets
- Department of Chemistry, Yale University, New Haven, Connecticut 06520 United States
| | - E. Chui-Ying Yan
- Department of Chemistry, Yale University, New Haven, Connecticut 06520 United States
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11
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Sum-Frequency Generation Vibrational Spectroscopy: A Nonlinear Optical Tool to Probe the Polymer Interfaces. SPRINGER PROCEEDINGS IN PHYSICS 2019. [DOI: 10.1007/978-981-15-0202-6_3] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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12
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Jarisz TA, Lane S, Gozdzialski L, Hore DK. Ions, metabolites, and cells: Water as a reporter of surface conditions during bacterial growth. J Chem Phys 2018; 148:222825. [DOI: 10.1063/1.5023748] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Tasha A. Jarisz
- Department of Chemistry, University of Victoria, Victoria, British Columbia V8W 3V6, Canada
| | - Sarah Lane
- Department of Chemistry, University of Victoria, Victoria, British Columbia V8W 3V6, Canada
| | - Lea Gozdzialski
- Department of Chemistry, University of Victoria, Victoria, British Columbia V8W 3V6, Canada
| | - Dennis K. Hore
- Department of Chemistry, University of Victoria, Victoria, British Columbia V8W 3V6, Canada
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13
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Defante AP, Nyarko A, Kaur S, Burai TN, Dhinojwala A. Interstitial Water Enhances Sliding Friction. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:4084-4094. [PMID: 29505260 DOI: 10.1021/acs.langmuir.8b00100] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
This study examines how surfaces with different water contact angles (wettability) affect dry and underwater adhesion and friction. These studies were conducted by bringing a deformable hydrophobic poly(dimethylsiloxane) lens in contact with surfaces of gradient wettability. On the basis of our adhesion and friction results, we divide the results in three regions. In region I (water contact angles greater than 80°), the dry adhesion is lower than underwater adhesion. In contrast, in region III, (water contact angles less than 50°), the dry adhesion is higher than underwater adhesion. For surfaces with water contact angles between 50 and 80° (region II), the dry and wet adhesion values are comparable. Interestingly, in this region II, the underwater coefficient of friction (COF) values are higher than those in regions I and III. We have used surface-sensitive sum frequency generation (SFG) spectroscopy to probe whether the contact interface in static conditions and during dynamic sliding is dry or wet. The SFG results reveal that the contact is dry in region I. If this dry contact is maintained, the underwater COF follows the trend of adhesion hysteresis in dry conditions (adhesion hysteresis decreases with an increase in water contact angles). In region III, the contact is wet and the underwater COF follows the trend for adhesion hysteresis in wet conditions (adhesion hysteresis increases with an increase in water contact angles). By knowing whether the contact interfaces are dry or wet, we can relate the trends in COF with the trends in adhesion hysteresis. For conditions where the contact interfaces have both dry and wet patches (region II), the COF values are higher than those in completely dry conditions, suggesting that a partially lubricated system can exhibit a higher COF.
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Affiliation(s)
- Adrian P Defante
- Department of Polymer Science , The University of Akron , Akron , Ohio 44325-3909 , United States
| | - Alex Nyarko
- Department of Polymer Science , The University of Akron , Akron , Ohio 44325-3909 , United States
| | - Sukhmanjot Kaur
- Department of Polymer Science , The University of Akron , Akron , Ohio 44325-3909 , United States
| | - Tarak N Burai
- Department of Polymer Science , The University of Akron , Akron , Ohio 44325-3909 , United States
| | - Ali Dhinojwala
- Department of Polymer Science , The University of Akron , Akron , Ohio 44325-3909 , United States
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14
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Sanders SE, Vanselous H, Petersen PB. Water at surfaces with tunable surface chemistries. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:113001. [PMID: 29393860 DOI: 10.1088/1361-648x/aaacb5] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Aqueous interfaces are ubiquitous in natural environments, spanning atmospheric, geological, oceanographic, and biological systems, as well as in technical applications, such as fuel cells and membrane filtration. Where liquid water terminates at a surface, an interfacial region is formed, which exhibits distinct properties from the bulk aqueous phase. The unique properties of water are governed by the hydrogen-bonded network. The chemical and physical properties of the surface dictate the boundary conditions of the bulk hydrogen-bonded network and thus the interfacial properties of the water and any molecules in that region. Understanding the properties of interfacial water requires systematically characterizing the structure and dynamics of interfacial water as a function of the surface chemistry. In this review, we focus on the use of experimental surface-specific spectroscopic methods to understand the properties of interfacial water as a function of surface chemistry. Investigations of the air-water interface, as well as efforts in tuning the properties of the air-water interface by adding solutes or surfactants, are briefly discussed. Buried aqueous interfaces can be accessed with careful selection of spectroscopic technique and sample configuration, further expanding the range of chemical environments that can be probed, including solid inorganic materials, polymers, and water immiscible liquids. Solid substrates can be finely tuned by functionalization with self-assembled monolayers, polymers, or biomolecules. These variables provide a platform for systematically tuning the chemical nature of the interface and examining the resulting water structure. Finally, time-resolved methods to probe the dynamics of interfacial water are briefly summarized before discussing the current status and future directions in studying the structure and dynamics of interfacial water.
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Affiliation(s)
- Stephanie E Sanders
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853, United States of America
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15
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Hegemann D, Hocquard N, Heuberger M. Nanoconfined water can orient and cause long-range dipolar interactions with biomolecules. Sci Rep 2017; 7:17852. [PMID: 29259309 PMCID: PMC5736754 DOI: 10.1038/s41598-017-18258-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Accepted: 12/08/2017] [Indexed: 11/25/2022] Open
Abstract
Surface properties are generally determined by the top most surface layer also defining how molecules adsorb onto it. By exploring effects due to interactions with deeper subsurface layers, however, long-range interaction forces were found to also significantly contribute to molecular adsorption, in which hydration of the subsurface region is the key factor. Water molecules confined to a subsurface amphiphilic gradient are confirmed to cause these long-range dipolar interactions by preferential orientation, thus significantly changing the way how a protein interacts with the surface. These findings imply future exploitation of an additional factor to modulate adsorption processes.
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Affiliation(s)
- Dirk Hegemann
- Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Advanced Fibers, Lerchenfeldstrasse 5, 9014, St.Gallen, Switzerland.
| | - Nicolas Hocquard
- Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Advanced Fibers, Lerchenfeldstrasse 5, 9014, St.Gallen, Switzerland
| | - Manfred Heuberger
- Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Advanced Fibers, Lerchenfeldstrasse 5, 9014, St.Gallen, Switzerland.
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16
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A molecular dynamics study on the adsorption of a mussel protein on two different films: Polymer film and a SAM. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2017.03.070] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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17
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Hoarau M, Badieyan S, Marsh ENG. Immobilized enzymes: understanding enzyme – surface interactions at the molecular level. Org Biomol Chem 2017; 15:9539-9551. [DOI: 10.1039/c7ob01880k] [Citation(s) in RCA: 110] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Interactions between immobilized enzymes and supporting surfaces are complex and context-dependent and can significantly alter enzyme structure, stability and activity.
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Affiliation(s)
- Marie Hoarau
- Department of Chemistry
- University of Michigan
- Ann Arbor
- USA
| | | | - E. Neil G. Marsh
- Department of Chemistry
- University of Michigan
- Ann Arbor
- USA
- Department of Biological Chemistry
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18
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Roy S, Covert PA, Jarisz TA, Chan C, Hore DK. Surface–Bulk Vibrational Correlation Spectroscopy. Anal Chem 2016; 88:4682-91. [DOI: 10.1021/acs.analchem.5b04544] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Sandra Roy
- Department of Chemistry, University of Victoria, Victoria, British Columbia V8W 3V6, Canada
| | - Paul A. Covert
- Department of Chemistry, University of Victoria, Victoria, British Columbia V8W 3V6, Canada
| | - Tasha A. Jarisz
- Department of Chemistry, University of Victoria, Victoria, British Columbia V8W 3V6, Canada
| | - Chantelle Chan
- Department of Chemistry, University of Victoria, Victoria, British Columbia V8W 3V6, Canada
| | - Dennis K. Hore
- Department of Chemistry, University of Victoria, Victoria, British Columbia V8W 3V6, Canada
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19
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Petit T, Yuzawa H, Nagasaka M, Yamanoi R, Osawa E, Kosugi N, Aziz EF. Probing Interfacial Water on Nanodiamonds in Colloidal Dispersion. J Phys Chem Lett 2015; 6:2909-2912. [PMID: 26267179 DOI: 10.1021/acs.jpclett.5b00820] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The structure of interfacial water layers around nanoparticles dispersed in an aqueous environment may have a significant impact on their reactivity and on their interaction with biological species. Using transmission soft X-ray absorption spectroscopy in liquid, we demonstrate that the unoccupied electronic states of oxygen atoms from water molecules in aqueous colloidal dispersions of nanodiamonds have a different signature than bulk water. X-ray absorption spectroscopy can thus probe interfacial water molecules in colloidal dispersions. The impacts of nanodiamond surface chemistry and concentration on interfacial water electronic signature are discussed.
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Affiliation(s)
- Tristan Petit
- †Institute of Methods for Materials Development, Helmholtz-Zentrum Berlin, Albert-Einstein-Strasse 15, 12489 Berlin, Germany
| | - Hayato Yuzawa
- ‡Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan
| | | | - Ryoko Yamanoi
- §Nanocarbon Research Institute, Shinshu University, Ueda, Nagano 386-8567, Japan
| | - Eiji Osawa
- §Nanocarbon Research Institute, Shinshu University, Ueda, Nagano 386-8567, Japan
| | - Nobuhiro Kosugi
- ‡Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan
| | - Emad F Aziz
- †Institute of Methods for Materials Development, Helmholtz-Zentrum Berlin, Albert-Einstein-Strasse 15, 12489 Berlin, Germany
- ‡Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan
- ∥Freie Universität Berlin, FB Physik, Arnimallee 14, 14195 Berlin, Germany
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20
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Zhao D, Peng C, Zhou J. Lipase adsorption on different nanomaterials: a multi-scale simulation study. Phys Chem Chem Phys 2015; 17:840-50. [DOI: 10.1039/c4cp04696j] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Adsorption orientations of lipase on different nanomaterials with different surface chemistry.
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Affiliation(s)
- Daohui Zhao
- School of Chemistry and Chemical Engineering
- Guangdong Provincial Key Lab for Green Chemical Product Technology
- South China University of Technology
- Guangzhou
- P. R. China
| | - Chunwang Peng
- School of Chemistry and Chemical Engineering
- Guangdong Provincial Key Lab for Green Chemical Product Technology
- South China University of Technology
- Guangzhou
- P. R. China
| | - Jian Zhou
- School of Chemistry and Chemical Engineering
- Guangdong Provincial Key Lab for Green Chemical Product Technology
- South China University of Technology
- Guangzhou
- P. R. China
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21
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Ren H, Zhang L, Li X, Li Y, Wu W, Li H. Interfacial structure and wetting properties of water droplets on graphene under a static electric field. Phys Chem Chem Phys 2015; 17:23460-7. [DOI: 10.1039/c5cp04205d] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The equilibrium water droplets present a hemispherical, a conical and an ordered cylindrical shape with the increase of external E-field intensity.
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Affiliation(s)
- Hongru Ren
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials
- Ministry of Education
- Shandong University
- Jinan 250061
- People's Republic of China
| | - Leining Zhang
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials
- Ministry of Education
- Shandong University
- Jinan 250061
- People's Republic of China
| | - Xiongying Li
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials
- Ministry of Education
- Shandong University
- Jinan 250061
- People's Republic of China
| | - Yifan Li
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials
- Ministry of Education
- Shandong University
- Jinan 250061
- People's Republic of China
| | - Weikang Wu
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials
- Ministry of Education
- Shandong University
- Jinan 250061
- People's Republic of China
| | - Hui Li
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials
- Ministry of Education
- Shandong University
- Jinan 250061
- People's Republic of China
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22
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Lis D, Backus EHG, Hunger J, Parekh SH, Bonn M. Liquid flow along a solid surface reversibly alters interfacial chemistry. Science 2014; 344:1138-42. [DOI: 10.1126/science.1253793] [Citation(s) in RCA: 152] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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23
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Hall SA, Jena KC, Covert PA, Roy S, Trudeau TG, Hore DK. Molecular-Level Surface Structure from Nonlinear Vibrational Spectroscopy Combined with Simulations. J Phys Chem B 2014; 118:5617-36. [DOI: 10.1021/jp412742u] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Shaun A. Hall
- Department
of Chemistry, University of Victoria, Victoria, British Columbia, V8W 3V6, Canada
| | - Kailash C. Jena
- Department
of Chemistry, University of Victoria, Victoria, British Columbia, V8W 3V6, Canada
| | - Paul A. Covert
- Department
of Chemistry, University of Victoria, Victoria, British Columbia, V8W 3V6, Canada
| | - Sandra Roy
- Department
of Chemistry, University of Victoria, Victoria, British Columbia, V8W 3V6, Canada
| | - Travis G. Trudeau
- Department
of Chemistry, University of Victoria, Victoria, British Columbia, V8W 3V6, Canada
| | - Dennis K. Hore
- Department
of Chemistry, University of Victoria, Victoria, British Columbia, V8W 3V6, Canada
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24
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Ding B, Glukhova A, Sobczyk-Kojiro K, Mosberg HI, Tesmer JJG, Chen Z. Unveiling the membrane-binding properties of N-terminal and C-terminal regions of G protein-coupled receptor kinase 5 by combined optical spectroscopies. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:823-31. [PMID: 24401145 PMCID: PMC3983354 DOI: 10.1021/la404055a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/28/2013] [Revised: 12/21/2013] [Indexed: 06/03/2023]
Abstract
G protein-coupled receptor kinase 5 (GRK5) is thought to associate with membranes in part via N- and C-terminal segments that are typically disordered in available high-resolution crystal structures. Herein we investigate the interactions of these regions with model cell membrane using combined sum frequency generation (SFG) vibrational spectroscopy and attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy. It was found that both regions associate with POPC lipid bilayers but adopt different structures when doing so: GRK5 residues 2-31 (GRK5(2-31)) was in random coil whereas GRK5(546-565) was partially helical. When the subphase for the GRK5(2-31) peptide was changed to 40% TFE/60% 10 mM phosphate pH 7.4 buffer, a large change in the SFG amide I signal indicated that GRK5(2-31) became partially helical. By inspecting the membrane behavior of two different segments of GRK5(2-31), namely, GRK5(2-24) and GRK5(25-31), we found that residues 25-31 are responsible for membrane binding, whereas the helical character is imparted by residues 2-24. With SFG, we deduced that the orientation angle of the helical segment of GRK5(2-31) is 46 ± 1° relative to the surface normal in 40% TFE/60% 10 mM phosphate pH = 7.4 buffer but increases to 78 ± 11° with higher ionic strength. We also investigated the effect of PIP2 in the model membrane and concluded that the POPC:PIP2 (9:1) lipid bilayer did not change the behavior of either peptide compared to a pure POPC lipid bilayer. With ATR-FTIR, we also found that Ca(2+)·calmodulin is able to extract both peptides from the POPC lipid bilayer, consistent with the role of this protein in disrupting GRK5 interactions with the plasma membrane in cells.
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Affiliation(s)
- Bei Ding
- Department
of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Alisa Glukhova
- Life
Sciences Institute and the Department of Pharmacology, University of Michigan, Ann Arbor, Michigan 48109-2216, United States
| | - Katarzyna Sobczyk-Kojiro
- College
of Pharmacy, Department of Medicinal Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1065, United States
| | - Henry I. Mosberg
- College
of Pharmacy, Department of Medicinal Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1065, United States
| | - John J. G. Tesmer
- Life
Sciences Institute and the Department of Pharmacology, University of Michigan, Ann Arbor, Michigan 48109-2216, United States
| | - Zhan Chen
- Department
of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
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25
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Roy S, Covert PA, FitzGerald WR, Hore DK. Biomolecular Structure at Solid–Liquid Interfaces As Revealed by Nonlinear Optical Spectroscopy. Chem Rev 2014; 114:8388-415. [DOI: 10.1021/cr400418b] [Citation(s) in RCA: 93] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Sandra Roy
- Department
of Chemistry, University of Victoria, Victoria, British Columbia, V8W 3V6 Canada
| | - Paul A. Covert
- Department
of Chemistry, University of Victoria, Victoria, British Columbia, V8W 3V6 Canada
| | - William R. FitzGerald
- Department
of Chemistry, University of Victoria, Victoria, British Columbia, V8W 3V6 Canada
| | - Dennis K. Hore
- Department
of Chemistry, University of Victoria, Victoria, British Columbia, V8W 3V6 Canada
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26
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Affiliation(s)
- Shanghao Li
- Department of Chemistry, University of Miami, 1301 Memorial Drive, Cox Science Center, Coral
Gables, Florida 33146, United States
| | - Roger M. Leblanc
- Department of Chemistry, University of Miami, 1301 Memorial Drive, Cox Science Center, Coral
Gables, Florida 33146, United States
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27
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Watkins M, Reischl B. A simple approximation for forces exerted on an AFM tip in liquid. J Chem Phys 2013; 138:154703. [PMID: 23614432 DOI: 10.1063/1.4800770] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The critical quantity in understanding imaging using an atomic force microscope is the force the sample exerts on the tip. We put forward a simple one-to-one force to water density relationship, explain exactly how it occurs, and in which circumstances it holds. We argue that two wide classes of atomic force microscope (AFM) tip should lead to at least qualitative agreement with our model and represent a significant fraction of AFM tips as currently prepared. This connection between the short-range force and the unperturbed equilibrium water density removes the need to perform simulations for each tip location, conservatively speeding up simulations by around three orders of magnitude compared to current methods that explicitly calculate the force on a tip model at each point in space.
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Affiliation(s)
- Matthew Watkins
- London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom.
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28
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Wright LB, Freeman CL, Walsh TR. Benzene adsorption at the aqueous (0 1 1) α-quartz interface: is surface flexibility important? MOLECULAR SIMULATION 2013. [DOI: 10.1080/08927022.2013.796589] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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29
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Totland C, Lewis RT, Nerdal W. Long-range surface-induced water structures and the effect of 1-butanol studied by 1H nuclear magnetic resonance. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:11055-11061. [PMID: 23937632 DOI: 10.1021/la401972g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Thin films of water between glass plates were investigated in this study with regard to water structure and dynamics in the temperature range of 278-313 K. We further investigated how addition of 1-butanol (0.05 and 0.5 M) affects the range and properties of the surface-induced water structures. From the observation of two (1)H nuclear magnetic resonance (NMR) water resonances and two relaxation components, it was found that the interfacial water exists in a two-state mixture in dynamic equilibrium, with the respective structures interpreted as being high-density water (HDW) and low-density water (LDW). In the absence of 1-butanol, the LDW state is more pronounced, with a further shift in equilibrium toward the LDW state with an increase in temperature. However, in water film samples containing 1-butanol, the HDW state dominates at low temperatures while the LDW state becomes more visible at higher temperatures. Furthermore, the addition of 1-butanol significantly increased the extent of the surface-induced water structures. NMR relaxation shows that the dynamics of water in the HDW state is significantly affected by the presence of 1-butanol and further indicates that the distribution of values for the enthalpy of activation associated with translational motion of water molecules in the HDW state is narrower in the 0.05 M 1-butanol sample than in the 0.5 M 1-butanol sample.
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Affiliation(s)
- Christian Totland
- Department of Chemistry, University of Bergen, Realfagbygget, Allégaten 41, N-5007 Bergen, Norway
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30
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Wright LB, Rodger PM, Corni S, Walsh TR. GolP-CHARMM: First-Principles Based Force Fields for the Interaction of Proteins with Au(111) and Au(100). J Chem Theory Comput 2013; 9:1616-30. [DOI: 10.1021/ct301018m] [Citation(s) in RCA: 177] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Louise B. Wright
- University of Warwick, Dept.
of Chemistry and Centre for Scientific Computing, Coventry, CV4 7AL,
United Kingdom
| | - P. Mark Rodger
- University of Warwick, Dept.
of Chemistry and Centre for Scientific Computing, Coventry, CV4 7AL,
United Kingdom
| | | | - Tiffany R. Walsh
- Deakin University,
Institute for
Frontier Materials, Geelong, Vic. 3216, Australia
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31
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Cross LJK, Hore DK. Dual-modulator broadband infrared Mueller matrix ellipsometry. APPLIED OPTICS 2012; 51:5100-5110. [PMID: 22858950 DOI: 10.1364/ao.51.005100] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2012] [Accepted: 05/11/2012] [Indexed: 06/01/2023]
Abstract
A broadband mid-infrared Mueller matrix ellipsometer is described based on two photoelastic modulators and a step-scan interferometer. The data are analyzed using a combination hardware-software double Fourier transformation. Obtaining spectra of the Mueller matrix elements requires that the infrared wavelength-dependent retardation amplitude of the modulators be known through calibration and subsequently incorporated into the data processing. The spectroscopic capability of the instrument is demonstrated in transmission and reflection geometries by the measured Mueller matrices of air, an anisotropic quartz crystal, and the ZnSe-water interface, each from 2500-4000 cm(-1).
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Affiliation(s)
- Liam J K Cross
- Department of Chemistry, University of Victoria, Victoria, British Columbia, Canada
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32
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Gaigeot MP, Sprik M, Sulpizi M. Oxide/water interfaces: how the surface chemistry modifies interfacial water properties. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2012; 24:124106. [PMID: 22395098 DOI: 10.1088/0953-8984/24/12/124106] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The organization of water at the interface with silica and alumina oxides is analysed using density functional theory-based molecular dynamics simulation (DFT-MD). The interfacial hydrogen bonding is investigated in detail and related to the chemistry of the oxide surfaces by computing the surface charge density and acidity. We find that water molecules hydrogen-bonded to the surface have different orientations depending on the strength of the hydrogen bonds and use this observation to explain the features in the surface vibrational spectra measured by sum frequency generation spectroscopy. In particular, 'ice-like' and 'liquid-like' features in these spectra are interpreted as the result of hydrogen bonds of different strengths between surface silanols/aluminols and water.
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Affiliation(s)
- Marie-Pierre Gaigeot
- LAMBE UMR8587, Université d'Evry val d'Essonne, Boulevard F Mitterrand, Bâtiment Maupertuis, F-91025 Evry, France.
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33
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Bolis V, Busco C, Martra G, Bertinetti L, Sakhno Y, Ugliengo P, Chiatti F, Corno M, Roveri N. Coordination chemistry of Ca sites at the surface of nanosized hydroxyapatite: interaction with H₂O and CO. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2012; 370:1313-36. [PMID: 22349244 DOI: 10.1098/rsta.2011.0273] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
The affinity towards water of a selection of well-defined, nanostructured hydroxyapatite (HA) samples was investigated by H(2)O vapour adsorption microcalorimetry and infrared (IR) spectroscopy. A large hydrophilicity of all investigated materials was confirmed. The surface features of hydrated HA were investigated on the as-synthesized samples pre-treated in mild conditions at T=303 K, whereas dehydrated HA features were characterized on samples activated at T=573 K. The relatively large hydrophilicity of the hydrated surface (-Δ(ads)H~100-50 kJ mol(-1)) was due to the interaction of water with the highly polarized H(2)O molecules strongly coordinated to the surface Ca(2+) cations. At the dehydrated surface, exposing coordinatively unsaturated (cus) Ca(2+) cations, H(2)O was still molecularly adsorbed but more strongly (-Δ(ads)H~120-90 kJ mol(-1)). The use of CO adsorption to quantify the Lewis acidic strength of HA surface sites revealed only a moderate strength of cus Ca(2+) cations, as confirmed by both microcalorimetric and IR spectroscopic measurements and ab initio calculations. This result implies that the large HA/H(2)O interaction energy is due to the interplay between cus Ca(2+) sites and nearby hydrophilic PO(4) groups, not revealed by the CO probe. The lower density of cus Ca(2+) cations at the 573 K activated HA surface with respect to the pristine one did not affect the whole hydrophilicity of the surface, as the polarizing effect of Ca sites is so strong to extend up to the fourth hydrated layer, as confirmed by both high-coverage microcalorimetric and IR spectroscopic data. No specific effects due to the investigated specimen preparation method and/or different morphology were observed.
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Affiliation(s)
- Vera Bolis
- Dipartimento DiSCAFF, Università del Piemonte Orientale A. Avogadro, Largo G. Donegani 2, Novara, 28100, Italy.
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34
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Affiliation(s)
- Francisco Zaera
- Department of Chemistry, University of California, Riverside, California 92521, United States
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35
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Ye S, Ma S, Wei F, Li H. Intramolecular vibrational coupling in water molecules revealed by compatible multiple nonlinear vibrational spectroscopic measurements. Analyst 2012; 137:4981-7. [DOI: 10.1039/c2an35684h] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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36
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Totland C, Lewis RT, Nerdal W. 1H NMR relaxation of water: A probe for surfactant adsorption on kaolin. J Colloid Interface Sci 2011; 363:362-70. [DOI: 10.1016/j.jcis.2011.07.064] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2011] [Revised: 07/18/2011] [Accepted: 07/19/2011] [Indexed: 10/17/2022]
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37
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Martin DR, Friesen AD, Matyushov DV. Electric field inside a “Rossky cavity” in uniformly polarized water. J Chem Phys 2011; 135:084514. [DOI: 10.1063/1.3628679] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
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38
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39
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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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40
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Jena KC, Covert PA, Hore DK. Phase measurement in nondegenerate three-wave mixing spectroscopy. J Chem Phys 2011; 134:044712. [DOI: 10.1063/1.3548840] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
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