1
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Merchiori S, Le Donne A, Littlefair JD, Lowe AR, Yu JJ, Wu XD, Li M, Li D, Geppert-Rybczyńska M, Scheller L, Trump BA, Yakovenko AA, Zajdel P, Chorążewski M, Grosu Y, Meloni S. Mild-Temperature Supercritical Water Confined in Hydrophobic Metal-Organic Frameworks. J Am Chem Soc 2024; 146:13236-13246. [PMID: 38701635 PMCID: PMC11099966 DOI: 10.1021/jacs.4c01226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2024] [Revised: 04/19/2024] [Accepted: 04/22/2024] [Indexed: 05/05/2024]
Abstract
Fluids under extreme confinement show characteristics significantly different from those of their bulk counterpart. This work focuses on water confined within the complex cavities of highly hydrophobic metal-organic frameworks (MOFs) at high pressures. A combination of high-pressure intrusion-extrusion experiments with molecular dynamic simulations and synchrotron data reveals that supercritical transition for MOF-confined water takes place at a much lower temperature than in bulk water, ∼250 K below the reference values. This large shifting of the critical temperature (Tc) is attributed to the very large density of confined water vapor in the peculiar geometry and chemistry of the cavities of Cu2tebpz (tebpz = 3,3',5,5'-tetraethyl-4,4'-bipyrazolate) hydrophobic MOF. This is the first time the shift of Tc is investigated for water confined within highly hydrophobic nanoporous materials, which explains why such a large reduction of the critical temperature was never reported before, neither experimentally nor computationally.
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Affiliation(s)
- Sebastiano Merchiori
- Department
of Chemical, Pharmaceutical and Agricultural Sciences, University of Ferrara, 44121 Ferrara, Italy
| | - Andrea Le Donne
- Department
of Chemical, Pharmaceutical and Agricultural Sciences, University of Ferrara, 44121 Ferrara, Italy
| | - Josh D. Littlefair
- Department
of Chemical, Pharmaceutical and Agricultural Sciences, University of Ferrara, 44121 Ferrara, Italy
| | | | - Jiang-Jing Yu
- College
of Chemistry and Chemical Engineering, and Chemistry and Chemical
Engineering Guangdong Laboratory, Shantou
University, Guangdong 515063, China
| | - Xu-Dong Wu
- College
of Chemistry and Chemical Engineering, and Chemistry and Chemical
Engineering Guangdong Laboratory, Shantou
University, Guangdong 515063, China
| | - Mian Li
- College
of Chemistry and Chemical Engineering, and Chemistry and Chemical
Engineering Guangdong Laboratory, Shantou
University, Guangdong 515063, China
| | - Dan Li
- College
of Chemistry and Materials Science, Jinan
University, Guangzhou 510632, China
| | | | - Lukasz Scheller
- Institute
of Physics, University of Silesia, 41-500 Chorzów, Poland
| | - Benjamin A. Trump
- NIST
Center for Neutron Research, National Institute
of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Andrey A. Yakovenko
- X-ray
Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Paweł Zajdel
- Institute
of Physics, University of Silesia, 41-500 Chorzów, Poland
| | - Mirosław Chorążewski
- Institute
of Chemistry, University of Silesia, Szkolna 9, 40-006 Katowice, Poland
| | - Yaroslav Grosu
- Institute
of Chemistry, University of Silesia, Szkolna 9, 40-006 Katowice, Poland
- Centre for
Cooperative Research on Alternative Energies (CIC energiGUNE), Basque Research and Technology Alliance (BRTA), 01510 Vitoria-Gasteiz, Spain
| | - Simone Meloni
- Department
of Chemical, Pharmaceutical and Agricultural Sciences, University of Ferrara, 44121 Ferrara, Italy
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2
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Ji J, Carpentier B, Chakraborty A, Nangia S. An Affordable Topography-Based Protocol for Assigning a Residue's Character on a Hydropathy (PARCH) Scale. J Chem Theory Comput 2024; 20:1656-1672. [PMID: 37018141 PMCID: PMC10902853 DOI: 10.1021/acs.jctc.3c00106] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Indexed: 04/06/2023]
Abstract
The hydropathy of proteins or quantitative assessment of protein-water interactions has been a topic of interest for decades. Most hydropathy scales use a residue-based or atom-based approach to assign fixed numerical values to the 20 amino acids and categorize them as hydrophilic, hydroneutral, or hydrophobic. These scales overlook the protein's nanoscale topography, such as bumps, crevices, cavities, clefts, pockets, and channels, in calculating the hydropathy of the residues. Some recent studies have included protein topography in determining hydrophobic patches on protein surfaces, but these methods do not provide a hydropathy scale. To overcome the limitations in the existing methods, we have developed a Protocol for Assigning a Residue's Character on the Hydropathy (PARCH) scale that adopts a holistic approach to assigning the hydropathy of a residue. The parch scale evaluates the collective response of the water molecules in the protein's first hydration shell to increasing temperatures. We performed the parch analysis of a set of well-studied proteins that include the following─enzymes, immune proteins, and integral membrane proteins, as well as fungal and virus capsid proteins. Since the parch scale evaluates every residue based on its location, a residue may have very different parch values inside a crevice versus a surface bump. Thus, a residue can have a range of parch values (or hydropathies) dictated by the local geometry. The parch scale calculations are computationally inexpensive and can compare hydropathies of different proteins. The parch analysis can affordably and reliably aid in designing nanostructured surfaces, identifying hydrophilic and hydrophobic patches, and drug discovery.
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Affiliation(s)
- Jingjing Ji
- Department
of Biomedical and Chemical Engineering, Syracuse University, Syracuse, New York 13244, United States
| | - Britnie Carpentier
- Department
of Biomedical and Chemical Engineering, Syracuse University, Syracuse, New York 13244, United States
| | - Arindam Chakraborty
- Department
of Chemistry, Syracuse University, Syracuse, New York 13244, United States
| | - Shikha Nangia
- Department
of Biomedical and Chemical Engineering, Syracuse University, Syracuse, New York 13244, United States
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3
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Mahmood A, Liu D, Sun Y, Wang Q, Chen S, Wang B, Chen L. Directional movement of gold nanoparticles on the silicon substrate due to the Laplace pressure: a molecular dynamics simulation study. J Mol Liq 2023. [DOI: 10.1016/j.molliq.2023.121767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
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4
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Khatir B, Golovin K. Comment on "Vapor Lubrication for Reducing Water and Ice Adhesion on Poly(dimethylsiloxane) Brushes": Vapor Alteration Alone Reduces Water Droplet Adhesion. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2208783. [PMID: 36960482 DOI: 10.1002/adma.202208783] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Revised: 10/26/2022] [Indexed: 05/17/2023]
Abstract
A reduction in lateral adhesion of water droplets on poly(dimethylsiloxane) (PDMS) brush surfaces exposed to various vapor conditions was recently reported. It was suggested that the mobility of droplets is due to swelling of the PDMS brushes. When changing the vapor surrounding sliding droplets on bare surfaces, a similar phenomenon is observed, presenting a much simpler explanation of the observed results.
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Affiliation(s)
- Behrooz Khatir
- Department of Mechanical & Industrial Engineering, University of Toronto, Toronto, ON, M5S 3G8, Canada
| | - Kevin Golovin
- Department of Mechanical & Industrial Engineering, University of Toronto, Toronto, ON, M5S 3G8, Canada
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5
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Xiao W, Cao X, Yao P, Garamus VM, Chen Q, Cheng J, Zou A. Enhanced Insecticidal Effect and Interface Behavior of Nicotine Hydrochloride Solution by a Vesicle Surfactant. Molecules 2022; 27:6916. [PMID: 36296512 PMCID: PMC9608593 DOI: 10.3390/molecules27206916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Revised: 10/09/2022] [Accepted: 10/12/2022] [Indexed: 11/17/2022] Open
Abstract
Nicotine hydrochloride (NCT) has a good control effect on hemiptera pests, but its poor interfacial behavior on the hydrophobic leaf leads to few practical applications. In this study, a vesicle solution by the eco-friendly surfactant, sodium diisooctyl succinate sulfonate (AOT), was prepared as the pesticide carrier for NCT. The physical chemical properties of NCT-loaded AOT vesicles (NCT/AOT) were investigated by techniques such as dynamic light scattering (DLS), small-angle X-ray scattering (SAXS), and cryogenic transmission electron microscopy (cryo-TEM). The results showed that the pesticide loading and encapsulation efficiency of NCT/AOT were 10.6% and 94.8%, respectively. The size of NCT/AOT vesicle was about 177 nm. SAXS and surface tension results indicated that the structure of the NCT/AOT vesicle still existed with low surface tension even after being diluted 200 times. The contact angle of NCT/AOT was always below 30°, which means it could wet the surface of the cabbage leaf well. Consequently, NCT/AOT vesicles could effectively reduce the bounce of pesticide droplets. In vitro release experiments showed that NCT/AOT vesicles had sustained release properties; 60% of NCT in NCT/AOT released after 24 h, and 80% after 48 h. Insecticidal activity assays against aphids revealed that AOT vesicles exhibited insecticidal activity and could have a synergistic insecticidal effect with NCT after the loading of NCT. Thus, the NCT/AOT vesicles significantly improved the insecticidal efficiency of NCT, which has potential application in agricultural production activities.
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Affiliation(s)
- Wenjun Xiao
- School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Xiufang Cao
- College of Science, Huazhong Agricultural University, Wuhan 430070, China
| | - Pengji Yao
- School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Vasil M. Garamus
- Department of Power-Based Materials Development, Institute of Metallic Biomaterials, Helmholtz-Zentrum Hereon, Max-Planck-Straße 1, 21502 Geesthacht, Germany
| | - Qibin Chen
- School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Jiagao Cheng
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China
| | - Aihua Zou
- School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China
- Shanghai Key Laboratory of Rare Earth Functional Materials, College of Chemistry and Materials Science, Shanghai Normal University, Shanghai 200234, China
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6
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Identifying hydrophobic protein patches to inform protein interaction interfaces. Proc Natl Acad Sci U S A 2021; 118:2018234118. [PMID: 33526682 DOI: 10.1073/pnas.2018234118] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Interactions between proteins lie at the heart of numerous biological processes and are essential for the proper functioning of the cell. Although the importance of hydrophobic residues in driving protein interactions is universally accepted, a characterization of protein hydrophobicity, which informs its interactions, has remained elusive. The challenge lies in capturing the collective response of the protein hydration waters to the nanoscale chemical and topographical protein patterns, which determine protein hydrophobicity. To address this challenge, here, we employ specialized molecular simulations wherein water molecules are systematically displaced from the protein hydration shell; by identifying protein regions that relinquish their waters more readily than others, we are then able to uncover the most hydrophobic protein patches. Surprisingly, such patches contain a large fraction of polar/charged atoms and have chemical compositions that are similar to the more hydrophilic protein patches. Importantly, we also find a striking correspondence between the most hydrophobic protein patches and regions that mediate protein interactions. Our work thus establishes a computational framework for characterizing the emergent hydrophobicity of amphiphilic solutes, such as proteins, which display nanoscale heterogeneity, and for uncovering their interaction interfaces.
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7
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Liu J, Sun Y, Zhou X, Li X, Kappl M, Steffen W, Butt HJ. One-Step Synthesis of a Durable and Liquid-Repellent Poly(dimethylsiloxane) Coating. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2100237. [PMID: 33955585 DOI: 10.1002/adma.202100237] [Citation(s) in RCA: 51] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Revised: 02/22/2021] [Indexed: 06/12/2023]
Abstract
Coatings with low sliding angles for liquid drops have a broad range of applications. However, it remains a challenge to have a fast, easy, and universal preparation method for coatings that are long-term stable, robust, and environmentally friendly. Here, a one-step grafting-from approach is reported for poly(dimethylsiloxane) (PDMS) brushes on surfaces through spontaneous polymerization of dichlorodimethylsilane fulfilling all these requirements. Drops of a variety of liquids slide off at tilt angles below 5°. This non-stick coating with autophobicity can reduce the waste of water and solvents in cleaning. The strong covalent attachment of the PDMS brush to the substrate makes them mechanically robust and UV-tolerant. Their resistance to high temperatures and to droplet sliding erosion, combined with the low film thickness (≈8 nm) makes them ideal candidates to solve the long-term degradation issues of coatings for heat-transfer surfaces.
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Affiliation(s)
- Jie Liu
- Max Planck Institute for Polymer Research, Ackermannweg 10, Mainz, D-55128, Germany
| | - Yuling Sun
- Max Planck Institute for Polymer Research, Ackermannweg 10, Mainz, D-55128, Germany
| | - Xiaoteng Zhou
- Max Planck Institute for Polymer Research, Ackermannweg 10, Mainz, D-55128, Germany
| | - Xiaomei Li
- Max Planck Institute for Polymer Research, Ackermannweg 10, Mainz, D-55128, Germany
| | - Michael Kappl
- Max Planck Institute for Polymer Research, Ackermannweg 10, Mainz, D-55128, Germany
| | - Werner Steffen
- Max Planck Institute for Polymer Research, Ackermannweg 10, Mainz, D-55128, Germany
| | - Hans-Jürgen Butt
- Max Planck Institute for Polymer Research, Ackermannweg 10, Mainz, D-55128, Germany
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8
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Ito K, Faraone A, Tyagi M, Yamaguchi T, Chen SH. Nanoscale dynamics of water confined in ordered mesoporous carbon. Phys Chem Chem Phys 2019; 21:8517-8528. [PMID: 30957810 PMCID: PMC11282953 DOI: 10.1039/c8cp07704e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/29/2024]
Abstract
The single particle dynamics of water confined within two ordered mesoporous carbon matrices was investigated in the temperature range from 290 K to 170 K by quasielastic neutron scattering using three high resolution neutron spectrometers. Thus, it was possible to investigate the mobility of water confined in model hydrophobic cavities at the nanoscale. Models developed for the nanoscale dynamics of supercooled water and water confined within hydrophilic matrices were able to describe the collected data but remarkable differences with analogous silica confined matrices were observed in these carbon samples. A significant fraction of the water molecules was immobile on the nanosecond timescale, even at room temperature. As the temperature was lowered, the mobility of the water molecules slowed down, but the strongly non-Arrhenius behavior observed in bulk water and for fully hydrated hydrophilic confinement was absent, which indicates frustration of the hydrogen bond network formation. The obtained results were relevant for applications of mesoporous carbon materials.
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Affiliation(s)
- Kanae Ito
- Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.
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9
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Franck JM, Han S. Overhauser Dynamic Nuclear Polarization for the Study of Hydration Dynamics, Explained. Methods Enzymol 2018; 615:131-175. [PMID: 30638529 DOI: 10.1016/bs.mie.2018.09.024] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
We outline the physical properties of hydration water that are captured by Overhauser Dynamic Nuclear Polarization (ODNP) relaxometry and explore the insights that ODNP yields about the water and the surface that this water is coupled to. As ODNP relies on the pairwise cross-relaxation between the electron spin of a spin probe and a proton nuclear spin of water, it captures the dynamics of single-particle diffusion of an ensemble of water molecules moving near the spin probe. ODNP principally utilizes the same physics as other nuclear magnetic resonance (NMR) relaxometry (i.e., relaxation measurement) techniques. However, in ODNP, electron paramagnetic resonance (EPR) excites the electron spins probes and their high net polarization acts as a signal amplifier. Furthermore, it renders ODNP parameters highly sensitive to water moving at rates commensurate with the EPR frequency of the spin probe (typically 10GHz). Also, ODNP selectively enhances the NMR signal contributions of water moving within close proximity to the spin label. As a result, ODNP can capture ps-ns movements of hydration waters with high sensitivity and locality, even in samples with protein concentrations as dilute as 10 µM. To date, the utility of the ODNP technique has been demonstrated for two major applications: the characterization of the spatial variation in the properties of the hydration layer of proteins or other surfaces displaying topological diversity, and the identification of structural properties emerging from highly disordered proteins and protein domains. The former has been shown to correlate well with the properties of hydration water predicted by MD simulations and has been shown capable of evaluating the hydrophilicity or hydrophobicity of a surface. The latter has been demonstrated for studies of an interhelical loop of proteorhodopsin, the partial structure of α-synuclein embedded at the lipid membrane surface, incipient structures adopted by tau proteins en route to fibrils, and the structure and hydration profile of a transmembrane peptide. This chapter focuses on offering a mechanistic understanding of the ODNP measurement and the molecular dynamics encoded in the ODNP parameters. In particular, it clarifies how the electron-nuclear dipolar coupling encodes information about the molecular dynamics in the nuclear spin self-relaxation and, more importantly, the electron-nuclear spin cross-relaxation rates. The clarification of the molecular dynamics underlying ODNP should assist in establishing a connection to theory and computer simulation that will offer far richer interpretations of ODNP results in future studies.
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Affiliation(s)
- John M Franck
- Department of Chemistry, Syracuse University, Syracuse, NY, United States.
| | - Songi Han
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, CA, United States; Department of Chemical Engineering, University of California Santa Barbara, Santa Barbara, CA, United States
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10
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Liu M, Hou Y, Li J, Tie L, Guo Z. Robust and self-repairing superamphiphobic coating from all-water-based spray. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2018.06.010] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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11
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Shen D, Zou G, Liu L, Wu A, Duley WW, Zhou YN. Investigation of impact and spreading of molten nanosized gold droplets on solid surfaces. APPLIED OPTICS 2018; 57:2080-2086. [PMID: 29603997 DOI: 10.1364/ao.57.002080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Accepted: 02/09/2018] [Indexed: 06/08/2023]
Abstract
Understanding the impact dynamics and spreading of molten nanosized droplets on a solid surface is a crucial step towards the design and control of nano-fabrication in many novel applications of nanotechnology. In this context, molecular dynamic (MD) simulations have been conducted to compute temperature and dynamic contact angles of nano-droplets during impact. The evolution of the morphology of a molten metallic nano-droplet impacting on a substrate has been studied using a combination of experimental and simulation techniques. Femtosecond lasers have been used to transfer nanosized gold droplets. Droplet morphology calculated in MD simulations is found to be in good agreement with that seen in scanning electron microscopy (SEM) images. It is found that the spreading of nanoscale molten gold droplets upon impact is enhanced by increasing the droplet impact energy. As observed in experimental data, MD simulation results show that a high droplet-substrate heat transfer rate together with increased wettability of the substrate facilitates spreading and results in a thinner metal deposit after solidification.
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12
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Zulkifli NS, Yunos MZ, Ahmad A, Harun Z, Akhair SHM, Ahmad RAR, Azhar FH, Rashid AQA, Ismail AE. Influence of hydrophobic surface treatment toward performance of air filter. IOP CONFERENCE SERIES: MATERIALS SCIENCE AND ENGINEERING 2017; 226:012170. [DOI: 10.1088/1757-899x/226/1/012170] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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13
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Jabes BS, Bratko D, Luzar A. Universal Repulsive Contribution to the Solvent-Induced Interaction Between Sizable, Curved Hydrophobes. J Phys Chem Lett 2016; 7:3158-3163. [PMID: 27463998 DOI: 10.1021/acs.jpclett.6b01442] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
In addition to the direct attraction, sizable hydrophobes in water experience an attractive force mediated by interfacial water. Using simple geometric arguments, we identify the conditions at which the water-induced interaction between curved hydrocarbon surfaces becomes repulsive. The repulsive contribution arises from the thermodynamic penalty due to the emergence of the liquid/vapor boundary created as water gets expelled between curved hydrophobes. By augmenting the mean field approach with atomistic simulations of pristine and alkyl-coated graphitic nanoparticles in three distinct geometries, spherical, cylindrical and planar, immersed in water, we show the macroscopic thermodynamics remarkably works down to the molecular scale. The new insights improve the prediction and control of wetting and dispersion properties for a broad class of nonpolar nanoparticles.
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Affiliation(s)
- B Shadrack Jabes
- Department of Chemistry, Virginia Commonwealth University , Richmond, Virginia 23284, United States
| | - Dusan Bratko
- Department of Chemistry, Virginia Commonwealth University , Richmond, Virginia 23284, United States
| | - Alenka Luzar
- Department of Chemistry, Virginia Commonwealth University , Richmond, Virginia 23284, United States
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14
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Eckardt O, Pietsch C, Zumann O, von der Lühe M, Brauer DS, Schacher FH. Well-Defined SiO2
@P(EtOx-stat
-EI) Core-Shell Hybrid Nanoparticles via Sol-Gel Processes. Macromol Rapid Commun 2015; 37:337-42. [DOI: 10.1002/marc.201500467] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Revised: 10/16/2015] [Indexed: 10/22/2022]
Affiliation(s)
- Oliver Eckardt
- Institute of Organic and Macromolecular Chemistry; Friedrich Schiller University Jena; Humboldtstr. 10 07743 Jena Germany
- Jena Center for Soft Matter (JCSM); Friedrich Schiller University Jena; Philosophenweg 7 07743 Jena Germany
| | - Christian Pietsch
- Institute of Organic and Macromolecular Chemistry; Friedrich Schiller University Jena; Humboldtstr. 10 07743 Jena Germany
- Jena Center for Soft Matter (JCSM); Friedrich Schiller University Jena; Philosophenweg 7 07743 Jena Germany
| | - Oliver Zumann
- Institute of Organic and Macromolecular Chemistry; Friedrich Schiller University Jena; Humboldtstr. 10 07743 Jena Germany
- Jena Center for Soft Matter (JCSM); Friedrich Schiller University Jena; Philosophenweg 7 07743 Jena Germany
| | - Moritz von der Lühe
- Institute of Organic and Macromolecular Chemistry; Friedrich Schiller University Jena; Humboldtstr. 10 07743 Jena Germany
- Jena Center for Soft Matter (JCSM); Friedrich Schiller University Jena; Philosophenweg 7 07743 Jena Germany
| | - Delia S. Brauer
- Otto Schott Institute of Materials Research; Friedrich Schiller University Jena; Fraunhoferstr. 6 07743 Jena Germany
| | - Felix H. Schacher
- Institute of Organic and Macromolecular Chemistry; Friedrich Schiller University Jena; Humboldtstr. 10 07743 Jena Germany
- Jena Center for Soft Matter (JCSM); Friedrich Schiller University Jena; Philosophenweg 7 07743 Jena Germany
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15
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Siretanu I, Chapel JP, Bastos-González D, Drummond C. Ions-Induced Nanostructuration: Effect of Specific Ionic Adsorption on Hydrophobic Polymer Surfaces. J Phys Chem B 2013; 117:6814-22. [DOI: 10.1021/jp400531x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Igor Siretanu
- CNRS, Centre de Recherche Paul
Pascal (CRPP), UPR 8641, F-33600 Pessac, France
- Université Bordeaux 1, CRPP, F-33600 Pessac, France
| | - Jean-Paul Chapel
- CNRS, Centre de Recherche Paul
Pascal (CRPP), UPR 8641, F-33600 Pessac, France
- Université Bordeaux 1, CRPP, F-33600 Pessac, France
| | - Delfi Bastos-González
- Biocolloid and Fluid Physics Group,
Department of Applied Physics, University of Granada, Av. Fuentenueva S/N, 18071 Granada, Spain
| | - Carlos Drummond
- CNRS, Centre de Recherche Paul
Pascal (CRPP), UPR 8641, F-33600 Pessac, France
- Université Bordeaux 1, CRPP, F-33600 Pessac, France
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16
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Abstract
Hydrophobic interactions guide protein folding, multidomain protein assembly, receptor-ligand binding, membrane formation, and cellular transportation. On the macroscale, hydrophobic interactions consist of the aggregation of "oil-like" objects in water by minimizing the interfacial energy. However, studies of the hydration behavior of small hydrophobic molecules have shown that the microscopic (~1 nm) hydration mechanism differs fundamentally from its macroscopic counterpart. Theoretical studies over the last two decades have pointed to an intricate dependence of molecular hydration mechanisms on the length scale. The microscopic-to-macroscopic crossover length scale is critically important to hydrophobic interactions in polymers, proteins, and other macromolecules. Accurate experimental determination of hydration mechanisms and interaction strengths directly influence our understanding of protein folding. In this Account, we discuss our recent measurements of the hydration energies of single hydrophobic homopolymers as they unfold. We describe in detail our single molecule force spectroscopy technique, the interpretation of the single polymer force curve, and how it relates to the hydration free energy of a hydrophobic polymer. Specifically, we show how temperature, side-chain sizes and solvent conditions, affect the driving force of hydrophobic collapse. The experiments reveal that the size of the nonpolar polymer side-chains changes the thermal signatures of hydration. The sizes of the polymer side-chains bridge the length scale where theories had predicted a transition between entropically driven microscopic hydration and enthalpically driven macroscopic hydrophobic hydration. Our experimental results revealed a crossover length scale of approximately 1 nm, similar to the results from recent theoretical studies. Experiments that probe solvent dependency show that the microscopic polymer hydration is correlated with macroscopic interfacial tension. Consistent with theoretical predictions, the solvent conditions affect the microscopic and macroscopic hydrophobic strengths in similar ways. Although the extended polymers and proteins span hundreds of nanometers, the experiments show that their hydration behavior is determined by the size of a single hydrophobic monomer. As the hydrophobic particle size decreases from the macroscopic to the microscopic regime, the scaling relationship changes from a dependence on interfacial area to a dependence on volume. Therefore, under these conditions, the driving force for the aggregation of hydrophobic molecules is reduced, which has significant implications for the strength of hydrophobic interactions in molecular systems, particularly in protein folding.
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Affiliation(s)
- Isaac T. S. Li
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S3H6, Canada
| | - Gilbert C. Walker
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S3H6, Canada
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17
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Daidone I, Iacobucci C, McLain SE, Smith JC. Alteration of water structure by peptide clusters revealed by neutron scattering in the small-angle region (below 1 Å(-1)). Biophys J 2012; 103:1518-24. [PMID: 23062344 DOI: 10.1016/j.bpj.2012.08.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2012] [Revised: 08/02/2012] [Accepted: 08/03/2012] [Indexed: 11/24/2022] Open
Abstract
Solution scattering of neutrons and x-rays can provide direct information on local interactions of importance for biomolecular folding and structure. Here, neutron scattering experiments are combined with molecular-dynamics simulation to interpret the scattering signal of a series of dipeptides with varying degrees of hydrophobicity (GlyAla, GlyPro, and AlaPro) in concentrated aqueous solution (1:20 solute/water ratio) in which the peptides form large segregates (up to 50-60 amino acids). Two main results are found: 1), the shift to lower Q of the so-called water-ring peak (Q ≈ 2 Å(-1)) arises mainly from an overlap of water-peptide and peptide-peptide correlations in the region of 1.3 <Q< 2 Å(-1), rather than from a shift of the water signal induced by the presence of the clusters; and 2), in the low-Q region (Q ≈ 0.6 Å(-1)) a positive peak is observed originating from both the solute-solute correlations and changes in the water structure induced by the formation of the clusters. In particular, the water molecules are found to be more connected than in the bulk with hydrogen-bonding directions tangential to the exposed hydrophobic surfaces, and this effect increases with increasing peptide hydrophobicity. This work demonstrates that important information on the (hydrophobic) hydration of biomolecules can be obtained in the very-small-angle region.
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Affiliation(s)
- Isabella Daidone
- Department of Physical and Chemical Sciences, University of L'Aquila, L'Aquila, Italy.
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Eun C, Berkowitz ML. Molecular dynamics simulation study of the water-mediated interaction between zwitterionic and charged surfaces. J Chem Phys 2012; 136:024501. [PMID: 22260597 DOI: 10.1063/1.3673960] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We calculated the potential of mean force (PMF) for the interaction between a model zwitterionic bilayer and a model charged bilayer. To understand the role of water, we separated the PMF into two components: one due to direct interaction and the other due to water-mediated interaction. In our calculations, we observed that water-mediated interaction is attractive at larger distances and repulsive at shorter. The calculation of the entropic and enthalpic contributions to the solvent-mediated components of the PMF showed that attraction is entropically dominant, while repulsion is dominated by the enthalpy.
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Affiliation(s)
- Changsun Eun
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
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Friesen AD, Matyushov DV. Non-Gaussian statistics of electrostatic fluctuations of hydration shells. J Chem Phys 2011; 135:104501. [DOI: 10.1063/1.3633478] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
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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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Matyushov DV. Nanosecond Stokes Shift Dynamics, Dynamical Transition, and Gigantic Reorganization Energy of Hydrated Heme Proteins. J Phys Chem B 2011; 115:10715-24. [DOI: 10.1021/jp200409z] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Dmitry V. Matyushov
- Center for Biological Physics, Arizona State University, P.O. Box 871504, Tempe, Arizona 85287-1504, United States
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Probing surface tension additivity on chemically heterogeneous surfaces by a molecular approach. Proc Natl Acad Sci U S A 2011; 108:6374-9. [PMID: 21460249 DOI: 10.1073/pnas.1014970108] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Surface free energy of a chemically heterogeneous surface is often treated as an approximately additive quantity through the Cassie equation [Cassie ABD (1948) Discuss Faraday Soc 3:11-16]. However, deviations from additivity are common, and molecular interpretations are still lacking. We use molecular simulations to measure the microscopic analogue of contact angle, Θ(c), of aqueous nanodrops on heterogeneous synthetic and natural surfaces as a function of surface composition. The synthetic surfaces are layers of graphene functionalized with prototypical nonpolar and polar head group: methyl, amino, and nitrile. We demonstrate positive as well as negative deviations from the linear additivity. We show the deviations reflect the uneven exposure of mixture components to the solvent and the linear relation is recovered if fractions of solvent-accessible surface are used as the measure of composition. As the spatial variations in polarity become of larger amplitude, the linear relation can no longer be obtained. Protein surfaces represent such natural patterned surfaces, also characterized by larger patches and roughness. Our calculations reveal strong deviations from linear additivity on a prototypical surface comprising surface fragments of melittin dimer. The deviations reflect the disproportionately strong influence of isolated polar patches, preferential wetting, and changes in the position of the liquid interface above hydrophobic patches. Because solvent-induced contribution to the free energy of surface association grows as cos Θ(c), deviations of cos Θ(c) from the linear relation directly reflect nonadditive adhesive energies of biosurfaces.
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Wang J, Kudesia S, Bratko D, Luzar A. Computational probe of cavitation events in protein systems. Phys Chem Chem Phys 2011; 13:19902-10. [PMID: 21922115 DOI: 10.1039/c1cp22082a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Jihang Wang
- Department of Chemistry, Virginia Commonwealth University, Richmond, VA 23284-2006, USA
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