1
|
Jiao S, Shell MS. Inverse design of pore wall chemistry and topology through active learning of surface group interactions. J Chem Phys 2024; 160:124705. [PMID: 38526115 DOI: 10.1063/5.0200900] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Accepted: 03/06/2024] [Indexed: 03/26/2024] Open
Abstract
Design of next-generation membranes requires a nanoscopic understanding of the effect of biologically inspired heterogeneous surface chemistries and topologies (roughness) on local water and solute behavior. In particular, the rejection of small, neutral solutes, such as boric acid, poses a heretofore unsolved challenge. In prior work, a computational inverse design technique using an evolutionary optimization successfully uncovered new surface design strategies for optimized transport of water over solutes in smooth, model pores consisting of two surface chemistries. However, extending such an approach to more complex (and realistic) scenarios involving many surface chemistries as well as surface roughness is challenging due to the expanded design space. In this work, we develop a new approach that uses active learning to optimize in a reduced feature space of surface group interactions, finding parameters that lead to their assembly into ordered, optimal patterns. This approach rapidly identifies novel surface functionalizations that maximize the difference in water and boric acid transport through the nanopore. Moreover, we find that the roughness of the nanopore wall, independent of its chemistry, can be leveraged to enhance transport selectivity: oscillations in the pore wall diameter optimally inhibit boric acid transport by creating energetic wells from which the solute must escape to transport down the pore. This proof-of-concept demonstrates the potential for active learning strategies, in concert with molecular simulations, to rapidly navigate complex design spaces of aqueous interfaces and is promising as a tool for engineering water-mediated surface interactions for a broad range of applications.
Collapse
Affiliation(s)
- Sally Jiao
- Department of Chemical Engineering, University of California, Santa Barbara, California 93106, USA
| | - M Scott Shell
- Department of Chemical Engineering, University of California, Santa Barbara, California 93106, USA
| |
Collapse
|
2
|
Jiao S, Robinson Brown DC, Shell MS. Relationships between Water's Structure and Solute Affinity at Polypeptoid Brush Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:761-771. [PMID: 38118078 DOI: 10.1021/acs.langmuir.3c02971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2023]
Abstract
Excellent antifouling surfaces are generally thought to create a tightly bound layer of water that resists solute adsorption, and highly hydrophilic surfaces such as those with zwitterionic functionalities are of significant current interest as antifoulant strategies. However, despite significant proofs-of-concept, we still lack a fundamental understanding of how the nanoscopic structure of this hydration layer translates to reduced fouling, how surface chemistry can be tuned to achieve antifouling through hydration water, and why, in particular, zwitterionic surfaces seem so promising. Here, we use molecular dynamics simulations and free energy calculations to investigate the molecular relationships among surface chemistry, hydration water structure, and surface-solute affinity across a variety of surface-decorated chemistries. Specifically, we consider polypeptoid-decorated surfaces that display well-known experimental antifouling capabilities and that can be synthesized sequence specifically, with precise backbone positioning of, e.g., charged groups. Through simulations, we calculate the affinities of a range of small solutes to polypeptoid brush surfaces of varied side-chain chemistries. We then demonstrate that measures of the structure of surface hydration water in response to a particular surface chemistry signal solute-surface affinity; specifically, we find that zwitterionic chemistries produce solute-surface repulsion through highly coordinated hydration water while suppressing tetrahedral structuring around the solute, in contrast to uncharged surfaces that show solute-surface affinity. Based on the relationship of this structural perturbation to the affinity of small-molecule solutes, we propose a molecular mechanism by which zwitterionic surface chemistries enhance solute repulsion, with broader implications for the design of antifouling surfaces.
Collapse
Affiliation(s)
- Sally Jiao
- Department of Chemical Engineering, University of California, Santa Barbara, California 93106, United States
| | - Dennis C Robinson Brown
- Department of Chemical Engineering, University of California, Santa Barbara, California 93106, United States
| | - M Scott Shell
- Department of Chemical Engineering, University of California, Santa Barbara, California 93106, United States
| |
Collapse
|
3
|
Palmer JC, Sarupria S, Truskett TM. Tribute to Pablo G. Debenedetti. J Phys Chem B 2023; 127:8075-8078. [PMID: 37766640 DOI: 10.1021/acs.jpcb.3c06020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/29/2023]
Affiliation(s)
- Jeremy C Palmer
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, United States
| | - Sapna Sarupria
- Department of Chemistry, Chemical Theory Center, University of Minnesota Twin Cities, Minneapolis, Minnesota 55455, United States
| | - Thomas M Truskett
- McKetta Department of Chemical Engineering and Department of Physics, The University of Texas at Austin, Austin, Texas 78712, United States
| |
Collapse
|
4
|
Carpenter J, Kim H, Suarez J, van der Zande A, Miljkovic N. The Surface Energy of Hydrogenated and Fluorinated Graphene. ACS APPLIED MATERIALS & INTERFACES 2023; 15:2429-2436. [PMID: 36563177 DOI: 10.1021/acsami.2c18329] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
The surface energy of graphene and its chemical derivatives governs fundamental interfacial interactions like molecular assembly, wetting, and doping. However, quantifying the surface energy of supported two-dimensional (2D) materials, such as graphene, is difficult because (1) they are so thin that electrostatic interactions emanating from the underlying substrate are not completely screened, (2) the contribution from the monolayer is sensitive to its exact chemical state, and (3) the adsorption of airborne contaminants, as well as contaminants introduced during transfer processing, screens the electrostatic interactions from the monolayer and underlying substrate, changing the determined surface energy. Here, we determine the polar and dispersive surface energy of bare, fluorinated, and hydrogenated graphene through contact angle measurements with water and diiodomethane. We accounted for many contributing factors, including substrate surface energies and combating adsorption of airborne contaminants. Hydrogenating graphene raises its polar surface energy with little effect on its dispersive surface energy. Fluorinating graphene lowers its dispersive surface energy with a substrate-dependent effect on its polar surface energy. These results unravel how changing the chemical structure of graphene modifies its surface energy, with applications for hybrid nanomaterials, bioadhesion, biosensing, and thin-film assembly.
Collapse
Affiliation(s)
- James Carpenter
- Department of Mechanical Science and Engineering, University of Illinois, Urbana, Illinois 61801, United States
| | - Hyunchul Kim
- Department of Mechanical Science and Engineering, University of Illinois, Urbana, Illinois 61801, United States
| | - Jules Suarez
- Department of Mechanical Science and Engineering, University of Illinois, Urbana, Illinois 61801, United States
| | - Arend van der Zande
- Department of Mechanical Science and Engineering, University of Illinois, Urbana, Illinois 61801, United States
- Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801, United States
| | - Nenad Miljkovic
- Department of Mechanical Science and Engineering, University of Illinois, Urbana, Illinois 61801, United States
- Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801, United States
- Department of Electrical and Computer Engineering, University of Illinois, Urbana, Illinois 61801, United States
- International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| |
Collapse
|
5
|
Wang Y, Zhao W, Han M, Xu J, Zhou X, Luu W, Han L, Tam KC. Topographical Design and Thermal-Induced Organization of Interfacial Water Structure to Regulate the Wetting State of Surfaces. JACS AU 2022; 2:1989-2000. [PMID: 36186561 PMCID: PMC9516702 DOI: 10.1021/jacsau.2c00273] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Revised: 08/05/2022] [Accepted: 08/08/2022] [Indexed: 06/16/2023]
Abstract
Smart surfaces with superhydrophobic/superhydrophilic characteristics can be controlled by external stimuli, such as temperature. These transitions are attributed to the molecular-level conformation of the grafted polymer chains due to the varied interactions at the interface. Here, tunable surfaces were prepared by grafting two well-known thermo-responsive polymers, poly(N-isopropylacrylamide) (PNIPAM) and poly(oligoethylene glycol)methyl ether acrylate (POEGMA188) onto micro-pollen particles of uniform morphology and roughness. Direct Raman spectra and thermodynamic analyses revealed that above the lower critical solution temperature, the bonded and free water at the interface partially transformed to intermediate water that disrupted the "water cage" surrounding the hydrophobic groups. The increased amounts of intermediate water produced hydrogen bonding networks that were less ordered around the polymer grafted microparticles, inducing a weaker binding interaction at the interface and a lower tendency to wet the surface. Combining the roughness factor, the bulk surface assembled by distinct polymer-grafted-pollen microparticles (PNIPAM or POEGMA188) could undergo a different wettability transition for liquid under air, water, and oil. This work identifies new perspectives on the interfacial water structure variation at a multiple length scale, which contributed to the temperature-dependent surface wettability transition. It offers inspiration for the application of thermo-responsive surface to liquid-gated multiphase separation, water purification and harvesting, biomedical devices, and printing.
Collapse
|
6
|
Ma J, Zheng Z, Hoque MJ, Li L, Rabbi KF, Ho JY, Braun PV, Wang P, Miljkovic N. A Lipid-Inspired Highly Adhesive Interface for Durable Superhydrophobicity in Wet Environments and Stable Jumping Droplet Condensation. ACS NANO 2022; 16:4251-4262. [PMID: 35275638 DOI: 10.1021/acsnano.1c10250] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Creating thin (<100 nm) hydrophobic coatings that are durable in wet conditions remains challenging. Although the dropwise condensation of steam on thin hydrophobic coatings can enhance condensation heat transfer by 1000%, these coatings easily delaminate. Designing interfaces with high adhesion while maintaining a nanoscale coating thickness is key to overcoming this challenge. In nature, cell membranes face this same challenge where nanometer-thick lipid bilayers achieve high adhesion in wet environments to maintain integrity. Nature ensures this adhesion by forming a lipid interface having two nonpolar surfaces, demonstrating high physicochemical resistance to biofluids attempting to open the interface. Here, developing an artificial lipid-like interface that utilizes fluorine-carbon molecular chains can achieve durable nanometric hydrophobic coatings. The application of our approach to create a superhydrophobic material shows high stability during jumping-droplet-enhanced condensation as quantified from a continual one-year steam condensation experiment. The jumping-droplet condensation enhanced condensation heat transfer coefficient up to 400% on tube samples when compared to filmwise condensation on bare copper. Our bioinspired materials design principle can be followed to develop many durable hydrophobic surfaces using alternate substrate-coating pairs, providing stable hydrophobicity or superhydrophobicity to a plethora of applications.
Collapse
Affiliation(s)
- Jingcheng Ma
- Department of Mechanical Science and Engineering, University of Illinois, Urbana, Illinois 61801, United States
| | - Zhuoyuan Zheng
- Department of Industrial and Enterprise Systems Engineering, University of Illinois, Urbana, Illinois 61801, United States
| | - Muhammad Jahidul Hoque
- Department of Mechanical Science and Engineering, University of Illinois, Urbana, Illinois 61801, United States
| | - Longnan Li
- Department of Mechanical Science and Engineering, University of Illinois, Urbana, Illinois 61801, United States
| | - Kazi Fazle Rabbi
- Department of Mechanical Science and Engineering, University of Illinois, Urbana, Illinois 61801, United States
| | - Jin Yao Ho
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Paul V Braun
- Department of Mechanical Science and Engineering, University of Illinois, Urbana, Illinois 61801, United States
- Department of Materials Science and Engineering, University of Illinois, Urbana, Illinois 61801, United States
- Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801, United States
| | - Pingfeng Wang
- Department of Industrial and Enterprise Systems Engineering, University of Illinois, Urbana, Illinois 61801, United States
| | - Nenad Miljkovic
- Department of Mechanical Science and Engineering, University of Illinois, Urbana, Illinois 61801, United States
- Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801, United States
- Department of Electrical and Computer Engineering, University of Illinois, Urbana, Illinois 61801, United States
- International Institute for Carbon Neutral Energy Research, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| |
Collapse
|
7
|
Jiao S, Rivera Mirabal DM, DeStefano AJ, Segalman RA, Han S, Shell MS. Sequence Modulates Polypeptoid Hydration Water Structure and Dynamics. Biomacromolecules 2022; 23:1745-1756. [PMID: 35274944 DOI: 10.1021/acs.biomac.1c01687] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We use molecular dynamics simulations to investigate the effect of polypeptoid sequence on the structure and dynamics of its hydration waters. Polypeptoids provide an excellent platform to study small-molecule hydration in disordered polymers, as they can be precisely synthesized with a variety of sidechain chemistries. We examine water behavior near a set of peptoid oligomers in which the number and placement of nonpolar versus polar sidechains are systematically varied. To do this, we leverage a new computational workflow enabling accurate sampling of polypeptoid conformations. We find that the hydration waters are less dense, are more tetrahedral, and have slower dynamics compared to bulk water. The magnitude of these shifts increases with the number of nonpolar groups. We also find that shifts in the water structure and dynamics are strongly correlated, suggesting that experimental insight into the dynamics of hydration water obtained by Overhauser dynamic nuclear polarization (ODNP) also contains information about water structural properties. We then demonstrate the ability of ODNP to probe site-specific dynamics of hydration water near these model peptoid systems.
Collapse
Affiliation(s)
- Sally Jiao
- Department of Chemical Engineering, University of California, Santa Barbara, California 93106, United States
| | - Daniela M Rivera Mirabal
- Department of Chemical Engineering, University of California, Santa Barbara, California 93106, United States.,Department of Chemical Engineering, University of Puerto Rico, Mayagüez, Puerto Rico 00681, United States
| | - Audra J DeStefano
- Department of Chemical Engineering, University of California, Santa Barbara, California 93106, United States
| | - Rachel A Segalman
- Department of Chemical Engineering, University of California, Santa Barbara, California 93106, United States.,Department of Materials, University of California, Santa Barbara, California 93106, United States
| | - Songi Han
- Department of Chemical Engineering, University of California, Santa Barbara, California 93106, United States.,Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - M Scott Shell
- Department of Chemical Engineering, University of California, Santa Barbara, California 93106, United States
| |
Collapse
|
8
|
Coburn PT, Li X, Li JY, Kishimoto Y, Li-Jessen NY. Progress in Vocal Fold Regenerative Biomaterials: An Immunological Perspective. ADVANCED NANOBIOMED RESEARCH 2022; 2:2100119. [PMID: 35434718 PMCID: PMC9007544 DOI: 10.1002/anbr.202100119] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Vocal folds, housed in the upper respiratory tract, are important to daily breathing, speech and swallowing functions. Irreversible changes to the vocal fold mucosae, such as scarring and atrophy, require a regenerative medicine approach to promote a controlled regrowth of the extracellular matrix (ECM)-rich mucosa. Various biomaterial systems have been engineered with an emphasis on stimulating local vocal fold fibroblasts to produce new ECM. At the same time, it is imperative to limit the foreign body reaction and associated immune components that can hinder the integration of the biomaterial into the host tissue. Modern biomaterial designs have become increasingly focused on actively harnessing the immune system to accelerate and optimize the process of tissue regeneration. An array of physical and chemical biomaterial parameters have been reported to effectively modulate local immune cells, such as macrophages, to initiate tissue repair, stimulate ECM production, promote biomaterial-tissue integration, and restore the function of the vocal folds. In this perspective paper, the unique immunological profile of the vocal folds will first be reviewed. Key physical and chemical biomaterial properties relevant to immunomodulation will then be highlighted and discussed. A further examination of the physicochemical properties of recent vocal fold biomaterials will follow to generate deeper insights into corresponding immune-related outcomes. Lastly, a perspective will be offered on the opportunity of integrating material-led immunomodulatory strategies into future vocal fold tissue engineering therapies.
Collapse
Affiliation(s)
- Patrick T. Coburn
- School of Communication Sciences and Disorders, McGill University, Canada
| | - Xuan Li
- Department of Mechanical Engineering, McGill University, Canada
| | - Jianyu. Y. Li
- Department of Mechanical Engineering, McGill University, Canada
- Department of Biomedical Engineering, McGill University, Canada
| | - Yo Kishimoto
- Department of Otolaryngology – Head & Neck Surgery, Kyoto University, Kyoto, Japan
| | - Nicole Y.K. Li-Jessen
- School of Communication Sciences and Disorders, McGill University, Canada
- Department of Biomedical Engineering, McGill University, Canada
- Department of Otolaryngology – Head & Neck Surgery, McGill University, Canada
| |
Collapse
|
9
|
Oh J, Orejon D, Park W, Cha H, Sett S, Yokoyama Y, Thoreton V, Takata Y, Miljkovic N. The apparent surface free energy of rare earth oxides is governed by hydrocarbon adsorption. iScience 2022; 25:103691. [PMID: 35036875 PMCID: PMC8752908 DOI: 10.1016/j.isci.2021.103691] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Revised: 11/01/2021] [Accepted: 12/20/2021] [Indexed: 12/01/2022] Open
Abstract
The surface free energy of rare earth oxides (REOs) has been debated during the last decade, with some reporting REOs to be intrinsically hydrophilic and others reporting hydrophobic. Here, we investigate the wettability and surface chemistry of pristine and smooth REO surfaces, conclusively showing that hydrophobicity stems from wettability transition due to volatile organic compound adsorption. We show that, for indoor ambient atmospheres and well-controlled saturated hydrocarbon atmospheres, the apparent advancing and receding contact angles of water increase with exposure time. We examined the surfaces comprehensively with multiple surface analysis techniques to confirm hydrocarbon adsorption and correlate it to wettability transition mechanisms. We demonstrate that both physisorption and chemisorption occur on the surface, with chemisorbed hydrocarbons promoting further physisorption due to their high affinity with similar hydrocarbon molecules. This study offers a better understanding of the intrinsic wettability of REOs and provides design guidelines for REO-based durable hydrophobic coatings. REOs are intrinsically hydrophilic but become hydrophobic as they adsorb hydrocarbons Our results demonstrate that both physisorption and chemisorption occur on the surface The adsorption of hydrocarbons was confirmed by multiple surface chemistry analysis Our work offers a better fundamental understanding of the intrinsic wettability of REO
Collapse
Affiliation(s)
- Junho Oh
- Department of Mechanical Science and Engineering, University of Illinois at Urbana–Champaign, Urbana, IL 61801, USA
- Department of Mechanical Engineering, BK21 FOUR ERICA-ACE Center, Hanyang University, Ansan, Gyeonggi 15588, Republic of Korea
- Corresponding author
| | - Daniel Orejon
- International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
- Institute for Multiscale Thermofluids, School of Engineering, University of Edinburgh, Edinburgh, EH9 3FD, UK
| | - Wooyoung Park
- Department of Mechanical Science and Engineering, University of Illinois at Urbana–Champaign, Urbana, IL 61801, USA
| | - Hyeongyun Cha
- Department of Mechanical Science and Engineering, University of Illinois at Urbana–Champaign, Urbana, IL 61801, USA
| | - Soumyadip Sett
- Department of Mechanical Science and Engineering, University of Illinois at Urbana–Champaign, Urbana, IL 61801, USA
| | - Yukihiro Yokoyama
- Department of Mechanical Science and Engineering, University of Illinois at Urbana–Champaign, Urbana, IL 61801, USA
| | - Vincent Thoreton
- International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
- Department of Materials Science and Engineering, Norwegian University of Science and Technology (NTNU), 7491 Trondheim, Norway
| | - Yasuyuki Takata
- International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Nenad Miljkovic
- Department of Mechanical Science and Engineering, University of Illinois at Urbana–Champaign, Urbana, IL 61801, USA
- International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
- Department of Electrical and Computer Engineering, University of Illinois at Urbana–Champaign, Urbana, IL 61801, USA
- Materials Research Laboratory, University of Illinois at Urbana–Champaign, Urbana, IL 61801, USA
- Corresponding author
| |
Collapse
|
10
|
Heydari P, Kharaziha M, Varshosaz J, Javanmard SH. Current knowledge of immunomodulation strategies for chronic skin wound repair. J Biomed Mater Res B Appl Biomater 2021; 110:265-288. [PMID: 34318595 DOI: 10.1002/jbm.b.34921] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Revised: 07/16/2021] [Accepted: 07/18/2021] [Indexed: 12/11/2022]
Abstract
In orchestrating the wound healing process, the immune system plays a critical role. Hence, controlling the immune system to repair skin defects is an attractive approach. The highly complex immune system includes the coordinated actions of several immune cells, which can produce various inflammatory and antiinflammatory cytokines and affect the healing of skin wounds. This process can be optimized using biomaterials, bioactive molecules, and cell delivery. The present review discusses various immunomodulation strategies for supporting the healing of chronic wounds. In this regard, following the evolution of the immune system and its role in the wound healing mechanism, the interaction between the extracellular mechanism and immune cells for acceleration wound healing will be firstly investigated. Consequently, the immune-based chronic wounds will be briefly examined and the mechanism of progression, and conventional methods of their treatment are evaluated. In the following, various biomaterials-based immunomodulation strategies are introduced to stimulate and control the immune system to treat and regenerate skin defects. Other effective methods of controlling the immune system in wound healing which is the release of bioactive agents (such as antiinflammatory, antigens, and immunomodulators) and stem cell therapy at the site of injury are reviewed.
Collapse
Affiliation(s)
- Parisa Heydari
- Department of Materials Engineering, Isfahan University of Technology, Isfahan, Iran
| | - Mahshid Kharaziha
- Department of Materials Engineering, Isfahan University of Technology, Isfahan, Iran
| | - Jaleh Varshosaz
- School of Pharmacy and Pharmaceutical Science, Isfahan University of Medical Science, Isfahan, Iran
| | - Shaghayegh Haghjooy Javanmard
- Applied Physiology Research Center, Cardiovascular Research Institute, Isfahan University of Medical Sciences, Isfahan, Iran
| |
Collapse
|
11
|
A Novel Computational Approach for the Discovery of Drug Delivery System Candidates for COVID-19. Int J Mol Sci 2021; 22:ijms22062815. [PMID: 33802169 PMCID: PMC7998631 DOI: 10.3390/ijms22062815] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Revised: 02/26/2021] [Accepted: 03/02/2021] [Indexed: 01/02/2023] Open
Abstract
In order to treat Coronavirus Disease 2019 (COVID-19), we predicted and implemented a drug delivery system (DDS) that can provide stable drug delivery through a computational approach including a clustering algorithm and the Schrödinger software. Six carrier candidates were derived by the proposed method that could find molecules meeting the predefined conditions using the molecular structure and its functional group positional information. Then, just one compound named glycyrrhizin was selected as a candidate for drug delivery through the Schrödinger software. Using glycyrrhizin, nafamostat mesilate (NM), which is known for its efficacy, was converted into micelle nanoparticles (NPs) to improve drug stability and to effectively treat COVID-19. The spherical particle morphology was confirmed by transmission electron microscopy (TEM), and the particle size and stability of 300-400 nm were evaluated by measuring DLSand the zeta potential. The loading of NM was confirmed to be more than 90% efficient using the UV spectrum.
Collapse
|
12
|
Monroe JI, Jiao S, Davis RJ, Robinson Brown D, Katz LE, Shell MS. Affinity of small-molecule solutes to hydrophobic, hydrophilic, and chemically patterned interfaces in aqueous solution. Proc Natl Acad Sci U S A 2021; 118:e2020205118. [PMID: 33372161 PMCID: PMC7821046 DOI: 10.1073/pnas.2020205118] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Performance of membranes for water purification is highly influenced by the interactions of solvated species with membrane surfaces, including surface adsorption of solutes upon fouling. Current efforts toward fouling-resistant membranes often pursue surface hydrophilization, frequently motivated by macroscopic measures of hydrophilicity, because hydrophobicity is thought to increase solute-surface affinity. While this heuristic has driven diverse membrane functionalization strategies, here we build on advances in the theory of hydrophobicity to critically examine the relevance of macroscopic characterizations of solute-surface affinity. Specifically, we use molecular simulations to quantify the affinities to model hydroxyl- and methyl-functionalized surfaces of small, chemically diverse, charge-neutral solutes represented in produced water. We show that surface affinities correlate poorly with two conventional measures of solute hydrophobicity, gas-phase water solubility and oil-water partitioning. Moreover, we find that all solutes show attraction to the hydrophobic surface and most to the hydrophilic one, in contrast to macroscopically based hydrophobicity heuristics. We explain these results by decomposing affinities into direct solute interaction energies (which dominate on hydroxyl surfaces) and water restructuring penalties (which dominate on methyl surfaces). Finally, we use an inverse design algorithm to show how heterogeneous surfaces, with multiple functional groups, can be patterned to manipulate solute affinity and selectivity. These findings, importantly based on a range of solute and surface chemistries, illustrate that conventional macroscopic hydrophobicity metrics can fail to predict solute-surface affinity, and that molecular-scale surface chemical patterning significantly influences affinity-suggesting design opportunities for water purification membranes and other engineered interfaces involving aqueous solute-surface interactions.
Collapse
Affiliation(s)
- Jacob I Monroe
- Department of Chemical Engineering, University of California, Santa Barbara, CA 93106
| | - Sally Jiao
- Department of Chemical Engineering, University of California, Santa Barbara, CA 93106
| | - R Justin Davis
- Department of Civil, Architectural and Environmental Engineering, University of Texas at Austin, Austin, TX 78712
| | - Dennis Robinson Brown
- Department of Chemical Engineering, University of California, Santa Barbara, CA 93106
| | - Lynn E Katz
- Department of Civil, Architectural and Environmental Engineering, University of Texas at Austin, Austin, TX 78712
| | - M Scott Shell
- Department of Chemical Engineering, University of California, Santa Barbara, CA 93106;
| |
Collapse
|
13
|
Xia Z, Villarreal E, Wang H, Lau BL. Nanoscale surface curvature modulates nanoparticle-protein interactions. Colloids Surf B Biointerfaces 2020; 190:110960. [DOI: 10.1016/j.colsurfb.2020.110960] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Revised: 02/28/2020] [Accepted: 03/09/2020] [Indexed: 02/07/2023]
|
14
|
Role of molecular architecture in the modulation of hydrophobic interactions. Curr Opin Colloid Interface Sci 2020. [DOI: 10.1016/j.cocis.2019.12.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
15
|
Liu J, Cui X, Xie L, Huang J, Zhang L, Liu J, Wang X, Wang J, Zeng H. Probing effects of molecular-level heterogeneity of surface hydrophobicity on hydrophobic interactions in air/water/solid systems. J Colloid Interface Sci 2019; 557:438-449. [DOI: 10.1016/j.jcis.2019.09.034] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2019] [Revised: 09/08/2019] [Accepted: 09/10/2019] [Indexed: 11/27/2022]
|
16
|
Qi C, Lei X, Zhou B, Wang C, Zheng Y. Temperature regulation of the contact angle of water droplets on the solid surfaces. J Chem Phys 2019; 150:234703. [PMID: 31228915 DOI: 10.1063/1.5090529] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
We investigate theoretically the stability of the wetting property, i.e., the contact angle values, as a function of the temperature. We find that the estimated temperature coefficient of the contact angle for the water droplets on an ordered water monolayer on a 100 surface of face-center cubic (FCC) is about one order of magnitude larger than that on a hydrophobic hexagonal surface in the temperature range between 290 K and 350 K, using molecular dynamics simulations. As temperature rises, the number of hydrogen bonds between the ordered water monolayer and the water droplet will increase, which therefore enhances the hydrophilicity of the ordered water monolayer at the FCC model surface. Our work thus provides an easily controllable and reversible way to control the degree of hydrophobicity of various solid surfaces exhibiting a similar wetting property of water droplets on the ordered water monolayer as such particular FCC (100) surfaces.
Collapse
Affiliation(s)
- Chonghai Qi
- School of Physics, Shandong University, Jinan 250100, China
| | - Xiaoling Lei
- Division of Interfacial Water and Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, People's Republic of China
| | - Bo Zhou
- School of Electronic Engineering, Chengdu Technological University, Chengdu 611730, China
| | - Chunlei Wang
- Division of Interfacial Water and Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, People's Republic of China
| | - Yujun Zheng
- School of Physics, Shandong University, Jinan 250100, China
| |
Collapse
|
17
|
Rego NB, Xi E, Patel AJ. Protein Hydration Waters Are Susceptible to Unfavorable Perturbations. J Am Chem Soc 2019; 141:2080-2086. [DOI: 10.1021/jacs.8b11448] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
|
18
|
Xi E, Marks SM, Fialoke S, Patel AJ. Sparse sampling of water density fluctuations near liquid-vapor coexistence. MOLECULAR SIMULATION 2018. [DOI: 10.1080/08927022.2018.1457218] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Erte Xi
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania , Philadelphia, PA, USA
| | - Sean M. Marks
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania , Philadelphia, PA, USA
| | - Suruchi Fialoke
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania , Philadelphia, PA, USA
| | - Amish J. Patel
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania , Philadelphia, PA, USA
| |
Collapse
|
19
|
Jabes BS, Bratko D, Luzar A. Extent of Surface Force Additivity on Chemically Heterogeneous Substrates at Varied Orientations. J Phys Chem B 2018; 122:3596-3603. [PMID: 29185778 DOI: 10.1021/acs.jpcb.7b10790] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Surface interactions between chemically mixed surfaces, as well as those among dissolved biomolecules, comprise distinct contributions from polar and hydrophobic moieties. These contributions are often context dependent. Approximate compliance to the Cassie additivity equation for the wetting free energies on mixed surfaces in water is, however, indicative of similarly additive forces between individual surface elements, suggesting a quadratic interpolation model for total force from the forces between pure surfaces. We use molecular dynamics/umbrella sampling simulations of parallel and nonparallel mixed surfaces with demonstrable Cassie-like behavior to verify how well the total surface force between the heterogeneous, molecularly rough surfaces can be approximated as a combination of forces among the homogeneous ones. When accounting for dissimilar distances of approach between functional groups of different types, our results for graphene surfaces with mixed methyl and nitrile coating show such a superposition to provide a reasonable first order approximation of interactions between the platelets. Deviations from additivity are more prominent in parallel-plate configurations, at high content of hydrophobic groups, and small separations. The inclusion of water polarizability does not visibly alter the observed behavior regardless of platelet orientations. The outcome of this study determines the necessary molecular conditions for observing force additivity that emphasize the context dependence of hydrophobic interaction in the presence of polar groups. This notion provides guidelines for the syntheses of new, chemically heterogeneous materials with tailored function-oriented properties in aqueous media.
Collapse
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
| |
Collapse
|
20
|
Abstract
An in-depth knowledge of the interaction of water with amorphous silica is critical to fundamental studies of interfacial hydration water, as well as to industrial processes such as catalysis, nanofabrication, and chromatography. Silica has a tunable surface comprising hydrophilic silanol groups and moderately hydrophobic siloxane groups that can be interchanged through thermal and chemical treatments. Despite extensive studies of silica surfaces, the influence of surface hydrophilicity and chemical topology on the molecular properties of interfacial water is not well understood. In this work, we controllably altered the surface silanol density, and measured surface water diffusivity using Overhauser dynamic nuclear polarization (ODNP) and complementary silica-silica interaction forces across water using a surface forces apparatus (SFA). The results show that increased silanol density generally leads to slower water diffusivity and stronger silica-silica repulsion at short aqueous separations (less than ∼4 nm). Both techniques show sharp changes in hydration properties at intermediate silanol densities (2.0-2.9 nm-2). Molecular dynamics simulations of model silica-water interfaces corroborate the increase in water diffusivity with silanol density, and furthermore show that even on a smooth and crystalline surface at a fixed silanol density, adjusting the spatial distribution of silanols results in a range of surface water diffusivities spanning ∼10%. We speculate that a critical silanol cluster size or connectivity parameter could explain the sharp transition in our results, and can modulate wettability, colloidal interactions, and surface reactions, and thus is a phenomenon worth further investigation on silica and chemically heterogeneous surfaces.
Collapse
|
21
|
Wang L, Cha X, Wu Y, Xu J, Cheng Z, Xiang Q, Xu J. Superhydrophobic Polymerized n-Octadecylsilane Surface for BTEX Sensing and Stable Toluene/Water Selective Detection Based on QCM Sensor. ACS OMEGA 2018; 3:2437-2443. [PMID: 31458538 PMCID: PMC6641280 DOI: 10.1021/acsomega.8b00061] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Accepted: 02/02/2018] [Indexed: 06/10/2023]
Abstract
The present study reports a facile and low-cost route to produce a superhydrophobic polymerized n-octadecylsilane surface with micronano hierarchical structure on the surface of quartz crystal microbalance (QCM). The surface is used as a novel functional sensing material to detect benzene, toluene, ethylbenzene, and xylene (BTEX) vapor on the basis of QCM platform. The composites were characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, and contact angle measurements. The type of solvent used to dissolve N-octadecyltrichlorosilane has a big impact on the morphology, wettability, and sensing performance of the polymer material. Further systematic studies suggest that surface wettability (contact angle) and molecular polarity of the detected analytes are effective factors in selective detection toward BTEX using resonator-type gas sensors. Gas sensing results toward toluene in different relative humidities show that the new-style sensor has stable toluene/water selective detection performance and that the disturbance of water is negligible. Besides, the limit of detection toward toluene of the sensor is lower than the odor threshold value.
Collapse
Affiliation(s)
- Luyu Wang
- NEST
Lab, Department of Physics, Department of Chemistry, College of Science, Shanghai University, Shanghai 200444, P. R.
China
| | - Xiaoli Cha
- NEST
Lab, Department of Physics, Department of Chemistry, College of Science, Shanghai University, Shanghai 200444, P. R.
China
| | - Yunling Wu
- Jiangsu
Key Laboratory for Carbon-Based Functional Materials & Devices,
Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou 215123, P. R. China
| | - Jin Xu
- School
of Industrial Engineering, Purdue University, 315 N. Grant Street, West Lafayette, Indiana 47907, United States
| | - Zhixuan Cheng
- NEST
Lab, Department of Physics, Department of Chemistry, College of Science, Shanghai University, Shanghai 200444, P. R.
China
| | - Qun Xiang
- NEST
Lab, Department of Physics, Department of Chemistry, College of Science, Shanghai University, Shanghai 200444, P. R.
China
| | - Jiaqiang Xu
- NEST
Lab, Department of Physics, Department of Chemistry, College of Science, Shanghai University, Shanghai 200444, P. R.
China
| |
Collapse
|
22
|
Yu Y, Krishnan NMA, Smedskjaer MM, Sant G, Bauchy M. The hydrophilic-to-hydrophobic transition in glassy silica is driven by the atomic topology of its surface. J Chem Phys 2018; 148:074503. [DOI: 10.1063/1.5010934] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Yingtian Yu
- Physics of AmoRphous and Inorganic Solids Laboratory (PARISlab), Department of Civil and Environmental Engineering, University of California, Los Angeles, California 90095, USA
| | - N. M. Anoop Krishnan
- Physics of AmoRphous and Inorganic Solids Laboratory (PARISlab), Department of Civil and Environmental Engineering, University of California, Los Angeles, California 90095, USA
| | - Morten M. Smedskjaer
- Department of Chemistry and Bioscience, Aalborg University, 9220 Aalborg, Denmark
| | - Gaurav Sant
- Laboratory for the Chemistry of Construction Materials (LC2), Department of Civil and Environmental Engineering, University of California, Los Angeles, California 90095, USA
- California Nanosystems Institute (CNSI), University of California, Los Angeles, California 90095, USA
| | - Mathieu Bauchy
- Physics of AmoRphous and Inorganic Solids Laboratory (PARISlab), Department of Civil and Environmental Engineering, University of California, Los Angeles, California 90095, USA
| |
Collapse
|
23
|
Montes de Oca JM, Menéndez CA, Accordino SR, Malaspina DC, Appignanesi GA. Studies on electrostatic interactions within model nano-confined aqueous environments of different chemical nature. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2017; 40:78. [PMID: 28929428 DOI: 10.1140/epje/i2017-11568-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Accepted: 09/05/2017] [Indexed: 06/07/2023]
Abstract
We study the potential of mean force for pairs of parallel flat surfaces with attractive electrostatic interactions by employing model systems functionalized with different charged, hydrophobic and hydrophilic groups. We study the way in which the local environment (hydrophobic or hydrophilic moieties) modulates the interaction between the attractive charged groups on the plates by removing or attracting nearby water and thus screening or not the electrostatic interaction. To explicitly account for the role of the solvent and the local hydrophobicity, we also perform studies in vacuo. Additionally, the results are compared to that for non-charged plates in order to single out and rationalize the non-additivity of the different non-covalent interactions. Our simulations demonstrate that the presence of neighboring hydrophobic groups promote water removal in the vicinity of the charged groups, thus enhancing charge attraction upon self-assembly. This role of the local hydrophobicity modulating electrostatic interactions is consistent with recent qualitative descriptions in the protein binding context.
Collapse
Affiliation(s)
- Joan Manuel Montes de Oca
- INQUISUR, Departamento de Química, Universidad Nacional del Sur (UNS)-CONICET, Avenida Alem 1253, 8000, Bahía Blanca, Argentina
| | - Cintia A Menéndez
- INQUISUR, Departamento de Química, Universidad Nacional del Sur (UNS)-CONICET, Avenida Alem 1253, 8000, Bahía Blanca, Argentina
| | - Sebastián R Accordino
- INQUISUR, Departamento de Química, Universidad Nacional del Sur (UNS)-CONICET, Avenida Alem 1253, 8000, Bahía Blanca, Argentina
| | - David C Malaspina
- Biomedical Engineering Department, Northwestern University, 2145 Sheridan Road, 60208, Evanston, IL, USA
| | - Gustavo A Appignanesi
- INQUISUR, Departamento de Química, Universidad Nacional del Sur (UNS)-CONICET, Avenida Alem 1253, 8000, Bahía Blanca, Argentina.
| |
Collapse
|
24
|
Chung L, Maestas DR, Housseau F, Elisseeff JH. Key players in the immune response to biomaterial scaffolds for regenerative medicine. Adv Drug Deliv Rev 2017; 114:184-192. [PMID: 28712923 DOI: 10.1016/j.addr.2017.07.006] [Citation(s) in RCA: 209] [Impact Index Per Article: 29.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Revised: 06/20/2017] [Accepted: 07/06/2017] [Indexed: 02/07/2023]
Abstract
The compatibility of biomaterials is critical to their structural and biological function in medical applications. The immune system is the first responder to tissue trauma and to a biomaterial implant. The innate immune effector cells, most notably macrophages, play a significant role in the defense against foreign bodies and the formation of a fibrous capsule around synthetic implants. Alternatively, macrophages participate in the pro-regenerative capacity of tissue-derived biological scaffolds. Research is now elucidating the role of the adaptive immune system, and T cells in particular, in directing macrophage response to synthetic and biological materials. Here, we review basic immune cell types and discuss recent research on the role of the immune system in tissue repair and its potential relevance to scaffold design. We will also discuss new emerging immune cell types relevant to biomaterial responses and tissue repair. Finally, prospects for specifically targeting and modulating the immune response to biomaterial scaffolds for enhancing tissue repair and regeneration will be presented.
Collapse
|
25
|
Bradford SM, Fisher EA, Meli MV. Ligand Shell Composition-Dependent Effects on the Apparent Hydrophobicity and Film Behavior of Gold Nanoparticles at the Air-Water Interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:9790-9796. [PMID: 27594307 DOI: 10.1021/acs.langmuir.6b02238] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Nanoparticles with well-defined interfacial energy and wetting properties are needed for a broad range of applications involving nanoparticle self-assembly including the formation of superlattices, stability of Pickering emulsions, and for the control of nanoparticle interactions with biological membranes. Theoretical, simulated, and recent experimental studies have found nanometer-scale chemical heterogeneity to have important effects on hydrophobic interactions. Here we report the study of 4 nm gold nanoparticles with compositionally well-defined mixed ligand shells of hydroxyl-(OH) and methyl-(CH3) terminated alkylthiols as Langmuir films. Compositions ranging from 0-25% hydroxyl were examined and reveal nonmonotonic changes in particle hydrophobicity at the air-water interface. Unlike nanoparticles capped exclusively with a methyl-terminated alkylthiol, extensive particle aggregation is found for ligand shells containing <2% hydroxyl-terminated chains. This aggregation was lessened upon increasing the quantity of OH-terminated chains. Nanoparticles capped with 25% OH yield films of well-separated nanoparticles exhibiting a fluid-phase regime in the surface pressure vs area isotherm. Compression-expansion hysteresis, monolayer collapse, and mean nanoparticle area measurements support the TEM-observed changes in film morphology. Such clear changes in the hydrophobicity of nanoparticles based on very small changes in the ligand shell composition are shown to impact the process of interfacial nanoparticle self-assembly and are an important demonstration of nanoscale wetting with consequences in both materials and biological applications of nanoparticles that require tunable hydrophobicity.
Collapse
Affiliation(s)
- Stephen M Bradford
- Department of Chemistry and Biochemistry, Mount Allison University , 63C York Street, Sackville, New Brunswick E4L 1E2, Canada
| | - Elizabeth A Fisher
- Department of Chemistry and Biochemistry, Mount Allison University , 63C York Street, Sackville, New Brunswick E4L 1E2, Canada
| | - M-Vicki Meli
- Department of Chemistry and Biochemistry, Mount Allison University , 63C York Street, Sackville, New Brunswick E4L 1E2, Canada
| |
Collapse
|
26
|
Geske J, Vogel M. Creating realistic silica nanopores for molecular dynamics simulations. MOLECULAR SIMULATION 2016. [DOI: 10.1080/08927022.2016.1221072] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Julian Geske
- Institut für Festkörperphysik, Technische Universität Darmstadt, Darmstadt, Germany
| | - Michael Vogel
- Institut für Festkörperphysik, Technische Universität Darmstadt, Darmstadt, Germany
| |
Collapse
|
27
|
Rana A, Patra A, Annamalai M, Srivastava A, Ghosh S, Stoerzinger K, Lee YL, Prakash S, Jueyuan RY, Goohpattader PS, Satyanarayana N, Gopinadhan K, Dykas MM, Poddar K, Saha S, Sarkar T, Kumar B, Bhatia CS, Giordano L, Shao-Horn Y, Venkatesan T. Correlation of nanoscale behaviour of forces and macroscale surface wettability. NANOSCALE 2016; 8:15597-15603. [PMID: 27510557 DOI: 10.1039/c6nr02076c] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
In this manuscript, we demonstrate a method based on atomic force microscopy which enables local probing of surface wettability. The maximum pull-off force, obtained from force spectroscopy shows a remarkable correlation with the macroscopically observed water contact angle, measured over a wide variety of surfaces starting from hydrophilic, all the way through to hydrophobic ones. This relationship, consequently, facilitates the establishment of a universal behaviour. The adhesion forces scale with the polar component of surface energy. However, no such relation could be established with the dispersive component. Hence, we postulate that the force(s) which enable us to correlate the force spectroscopy data measured on the nanoscale to the macroscopic contact angle are primarily arising from electrostatic-dipole-dipole interactions at the solid-liquid interface. London forces play less of a role. This effect in is line with density functional theory (DFT) calculations suggesting a higher degree of hydroxylation of hydrophilic surfaces. This result shows that molecular simulations and measurements on an atomic scale can be extrapolated to macroscopic surface wetting problems.
Collapse
Affiliation(s)
- Abhimanyu Rana
- NUSNNI-NanoCore, National University of Singapore (NUS), Singapore 117411.
| | - Abhijeet Patra
- NUSNNI-NanoCore, National University of Singapore (NUS), Singapore 117411. and NUS Graduate School for Integrative Sciences and Engineering (NGS), National University of Singapore (NUS), Singapore 117456
| | | | - Amar Srivastava
- NUSNNI-NanoCore, National University of Singapore (NUS), Singapore 117411.
| | - Siddhartha Ghosh
- NUSNNI-NanoCore, National University of Singapore (NUS), Singapore 117411.
| | - Kelsey Stoerzinger
- Electrochemical Energy Laboratory, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA 02139, USA.
| | - Yueh-Lin Lee
- Electrochemical Energy Laboratory, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA 02139, USA.
| | - Saurav Prakash
- NUSNNI-NanoCore, National University of Singapore (NUS), Singapore 117411. and NUS Graduate School for Integrative Sciences and Engineering (NGS), National University of Singapore (NUS), Singapore 117456
| | - Reuben Yeo Jueyuan
- Department of Electrical Engineering, National University of Singapore (NUS), 4 Engineering Drive 3, Singapore 117583
| | - Partho S Goohpattader
- Department of Electrical Engineering, National University of Singapore (NUS), 4 Engineering Drive 3, Singapore 117583
| | - Nalam Satyanarayana
- Department of Electrical Engineering, National University of Singapore (NUS), 4 Engineering Drive 3, Singapore 117583
| | - Kalon Gopinadhan
- NUSNNI-NanoCore, National University of Singapore (NUS), Singapore 117411.
| | - Michal M Dykas
- NUSNNI-NanoCore, National University of Singapore (NUS), Singapore 117411. and NUS Graduate School for Integrative Sciences and Engineering (NGS), National University of Singapore (NUS), Singapore 117456
| | - Kingshuk Poddar
- NUSNNI-NanoCore, National University of Singapore (NUS), Singapore 117411. and NUS Graduate School for Integrative Sciences and Engineering (NGS), National University of Singapore (NUS), Singapore 117456
| | - Surajit Saha
- NUSNNI-NanoCore, National University of Singapore (NUS), Singapore 117411.
| | - Tarapada Sarkar
- NUSNNI-NanoCore, National University of Singapore (NUS), Singapore 117411.
| | - Brijesh Kumar
- NUSNNI-NanoCore, National University of Singapore (NUS), Singapore 117411.
| | - Charanjit S Bhatia
- Department of Electrical Engineering, National University of Singapore (NUS), 4 Engineering Drive 3, Singapore 117583
| | - Livia Giordano
- Electrochemical Energy Laboratory, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA 02139, USA. and U.S. Department of Energy, National Energy Technology Laboratory, 626 Cochrans Mill Road, P.O. Box 10940, Pittsburgh, PA 15236-0940, USA
| | - Yang Shao-Horn
- Electrochemical Energy Laboratory, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA 02139, USA.
| | - T Venkatesan
- NUSNNI-NanoCore, National University of Singapore (NUS), Singapore 117411. and NUS Graduate School for Integrative Sciences and Engineering (NGS), National University of Singapore (NUS), Singapore 117456 and Department of Electrical Engineering, National University of Singapore (NUS), 4 Engineering Drive 3, Singapore 117583 and Department of Physics, Faculty of Science, National University of Singapore (NUS), Singapore 117551 and Department of Materials Science and Engineering, National University of Singapore (NUS), Singapore 117575
| |
Collapse
|
28
|
A Superamphiphobic Sponge with Mechanical Durability and a Self-Cleaning Effect. Sci Rep 2016; 6:29993. [PMID: 27435167 PMCID: PMC4951731 DOI: 10.1038/srep29993] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2016] [Accepted: 06/27/2016] [Indexed: 01/01/2023] Open
Abstract
A robust superamphiphobic sponge (SA-sponge) is proposed by using a single initiated chemical vapor deposition (i-CVD) process. Poly(3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-heptadecafluorodecyl methacrylate) (PFDMA) is deposited on a commercial sponge by the polymerization of fluoroalkyl acrylates during the i-CVD process. This PFDMA is conformally coated onto both the exterior and interior of the sponge structure by a single step of the i-CVD process at nearly room temperature. Due to the inherent porous structure of the sponge and the hydrophobic property of the fluorine-based PFDMA, the demonstrated SA-sponge shows not only superhydrophobicity but also superoleophobicity. Furthermore, the fabricated SA-sponge is robust with regard to physical and chemical damage. The fabricated SA-sponge can be utilized for multi-purpose applications such as gas-permeable liquid separators.
Collapse
|
29
|
Gupta PK, Meuwly M. Structure and Dynamics of Water/Methanol Mixtures at Hydroxylated Silica Interfaces Relevant to Chromatography. Chemphyschem 2016; 17:2938-44. [DOI: 10.1002/cphc.201600180] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2016] [Revised: 04/29/2016] [Indexed: 11/11/2022]
Affiliation(s)
- Prashant Kumar Gupta
- Department of Chemistry; University of Basel; Klingelbergstrasse 80 CH-4056 Basel Switzerland
- Lehrstuhl für Theoretische Chemie; Ruhr-Universität Bochum; Universitätsstraße 150 D-44801 Bochum Germany
| | - Markus Meuwly
- Department of Chemistry; University of Basel; Klingelbergstrasse 80 CH-4056 Basel Switzerland
| |
Collapse
|
30
|
Hydrophobic and Metallophobic Surfaces: Highly Stable Non-wetting Inorganic Surfaces Based on Lanthanum Phosphate Nanorods. Sci Rep 2016; 6:22732. [PMID: 26955962 PMCID: PMC4783694 DOI: 10.1038/srep22732] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2015] [Accepted: 02/18/2016] [Indexed: 11/08/2022] Open
Abstract
Metal oxides, in general, are known to exhibit significant wettability towards water molecules because of the high feasibility of synergetic hydrogen-bonding interactions possible at the solid-water interface. Here we show that the nano sized phosphates of rare earth materials (Rare Earth Phosphates, REPs), LaPO4 in particular, exhibit without any chemical modification, unique combination of intrinsic properties including remarkable hydrophobicity that could be retained even after exposure to extreme temperatures and harsh hydrothermal conditions. Transparent nanocoatings of LaPO4 as well as mixture of other REPs on glass surfaces are shown to display notable hydrophobicity with water contact angle (WCA) value of 120° while sintered and polished monoliths manifested WCA greater than 105°. Significantly, these materials in the form of coatings and monoliths also exhibit complete non-wettability and inertness towards molten metals like Ag, Zn, and Al well above their melting points. These properties, coupled with their excellent chemical and thermal stability, ease of processing, machinability and their versatile photo-physical and emission properties, render LaPO4 and other REP ceramics utility in diverse applications.
Collapse
|
31
|
Itoh H, Sakuma H. Dielectric constant of water as a function of separation in a slab geometry: A molecular dynamics study. J Chem Phys 2016; 142:184703. [PMID: 25978901 DOI: 10.1063/1.4919698] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Water in confining geometries shows various anomalous properties related to its structure and dynamics compared with bulk water. Here, the dielectric constant of water as a function of separation in a graphite slab geometry was studied using molecular dynamics simulations. The dielectric constants of water were calculated from the orientational polarization of water molecules when an external electric field was applied parallel and normal to the slabs. The reduction of the dielectric constant of water compared with bulk water can be explained by investigating the structure and dynamics of water in slab geometries. We found a preferred orientation of water molecules in the layer closest to the graphite surface. The self-diffusion coefficient distribution of water molecules along the direction normal to the slabs was also computed. Highly mobile water molecules in the intermediate region were generated by the weak hydrogen bonding produced by the preferred orientation of water molecules in the layer. We concluded that the dielectric constant of water in the slab geometry is lower than that of bulk water because of the reduction of the polarization of water and the highly mobile water molecules in the intermediate region arising from the preferred orientation of water molecules.
Collapse
Affiliation(s)
- Hidenosuke Itoh
- Corporate R&D Headquarters, Canon, Inc., 3-30-2 Shimomaruko, Ohta-ku, Tokyo 146-8501, Japan
| | - Hiroshi Sakuma
- National Institute for Materials Science (NIMS), Namiki, Tsukuba-city, Ibaraki 305-0044, Japan
| |
Collapse
|
32
|
Xi E, Remsing RC, Patel AJ. Sparse Sampling of Water Density Fluctuations in Interfacial Environments. J Chem Theory Comput 2016; 12:706-13. [DOI: 10.1021/acs.jctc.5b01037] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Erte Xi
- Department of Chemical and
Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Richard C. Remsing
- Department of Chemical and
Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Amish J. Patel
- Department of Chemical and
Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| |
Collapse
|
33
|
Carchini G, García-Melchor M, Łodziana Z, López N. Understanding and Tuning the Intrinsic Hydrophobicity of Rare-Earth Oxides: A DFT+U Study. ACS APPLIED MATERIALS & INTERFACES 2016; 8:152-160. [PMID: 26652180 DOI: 10.1021/acsami.5b07905] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Rare-earth oxides (REOs) possess a remarkable intrinsic hydrophobicity, making them candidates for a myriad of applications. Although the superhydrophobicity of REOs has been explored experimentally, the atomistic details of the structure at the oxide-water interface are still not well understood. In this work, we report a density functional theory study of the interaction between water and CeO2, Nd2O3, and α-Al2O3 to explain their different wettability. The wetting of the metal oxide surface is controlled by geometric and electronic factors. While the electronic term is related to the acid-base properties of the surface layer, the geometric factor depends on the matching between adsorption sites and oxygen atoms from the hexagonal water network. For all the metal oxides considered here, water dissociation is confined to the first oxide-water layer. Hydroxyl groups on α-Al2O3 are responsible for the strong oxide-water interaction, and thus, both Al- and hydroxyl-terminated wet. On CeO2, the intrinsic hydrophobicity of the clean surface disappears when lattice hydroxyl groups (created by the reaction of water with oxygen vacancies) are present as they dominate the interaction and drive wetting. Therefore, hydroxyls may convert a intrinsic nonwetting surface into a wetting one. Finally, we also report that surface modifications, like cation substitution, do not change the acid-base character of the surface, and thus they show the same nonwetting properties as native CeO2 or Nd2O3.
Collapse
Affiliation(s)
- Giuliano Carchini
- ICIQ - Institute of Chemical Research of Catalonia, The Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Max García-Melchor
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory , Menlo Park, California 94025, United States
| | - Zbigniew Łodziana
- Institute of Nuclear Physics, Polish Academy of Sciences , ulica Radzikowskiego 152, PL-31-342 Krakow, Poland
| | - Núria López
- ICIQ - Institute of Chemical Research of Catalonia , Av. Països Catalans 16, 43007 Tarragona, Spain
| |
Collapse
|
34
|
Wan R, Wang C, Lei X, Zhou G, Fang H. Enhancement of Water Evaporation on Solid Surfaces with Nanoscale Hydrophobic-Hydrophilic Patterns. PHYSICAL REVIEW LETTERS 2015; 115:195901. [PMID: 26588399 DOI: 10.1103/physrevlett.115.195901] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Indexed: 05/13/2023]
Abstract
Using molecular dynamics simulations, we show that the evaporation of nanoscale water on hydrophobic-hydrophilic patterned surfaces is unexpectedly faster than that on any surfaces with uniform wettability. The key to this phenomenon is that, on the patterned surface, the evaporation rate from the hydrophilic region only slightly decreases due to the correspondingly increased water thickness; meanwhile, a considerable number of water molecules evaporate from the hydrophobic region despite the lack of water film. Most of the evaporated water from the hydrophobic region originates from the hydrophilic region by diffusing across the contact lines. Further analysis shows that the evaporation rate from the hydrophobic region is approximately proportional to the total length of the contact lines.
Collapse
Affiliation(s)
- Rongzheng Wan
- Division of Interfacial Water and Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, P.O. Box 800-204, Shanghai 201800, China
| | - Chunlei Wang
- Division of Interfacial Water and Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, P.O. Box 800-204, Shanghai 201800, China
| | - Xiaoling Lei
- Division of Interfacial Water and Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, P.O. Box 800-204, Shanghai 201800, China
| | - Guoquan Zhou
- School of Sciences, Zhejiang A & F University, Lin'an 311300, P. R. China
| | - Haiping Fang
- Division of Interfacial Water and Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, P.O. Box 800-204, Shanghai 201800, China
| |
Collapse
|
35
|
Factorovich MH, Molinero V, Scherlis DA. Hydrogen-Bond Heterogeneity Boosts Hydrophobicity of Solid Interfaces. J Am Chem Soc 2015; 137:10618-23. [PMID: 26241823 DOI: 10.1021/jacs.5b05242] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Experimental and theoretical studies suggest that the hydrophobicity of chemically heterogeneous surfaces may present important nonlinearities as a function of composition. In this article, this issue is systematically explored using molecular simulations. The hydrophobicity is characterized by computing the contact angle of water on flat interfaces and the desorption pressure of water from cylindrical nanopores. The studied interfaces are binary mixtures of hydrophilic and hydrophobic sites, with and without the ability to form hydrogen bonds with water, intercalated at different scales. Water is described with the mW coarse-grained potential, where hydrogen-bonds are modeled in the absence of explicit hydrogen atoms, via a three-body term that favors tetrahedral coordination. We found that the combination of particles exhibiting the same kind of coordination with water gives rise to a linear dependence of contact angle with respect to composition, in agreement with the Cassie model. However, when only the hydrophilic component can form hydrogen bonds, unprecedented deviations from linearity are observed, increasing the contact angle and the vapor pressure above their values in the purely hydrophobic interface. In particular, the maximum enhancement is seen when a 35% of hydrogen bonding molecules is randomly scattered on a hydrophobic background. This effect is very sensitive to the heterogeneity length-scale, being significantly attenuated when the hydrophilic domains reach a size of 2 nm. The observed behavior may be qualitatively rationalized via a simple modification of the Cassie model, by assuming a different microrugosity for hydrogen bonding and non-hydrogen bonding interfaces.
Collapse
Affiliation(s)
- Matías H Factorovich
- Departamento de Química Inorgánica, Analítica y Química Física/INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires , Buenos Aires C1428EHA, Argentina
| | - Valeria Molinero
- Department of Chemistry, The University of Utah , 315 South 1400 East, Salt Lake City, Utah 84112-0850, United States
| | - Damián A Scherlis
- Departamento de Química Inorgánica, Analítica y Química Física/INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires , Buenos Aires C1428EHA, Argentina
| |
Collapse
|
36
|
Remsing RC, Weeks JD. Hydrophobicity Scaling of Aqueous Interfaces by an Electrostatic Mapping. J Phys Chem B 2014; 119:9268-77. [DOI: 10.1021/jp509903n] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Richard C. Remsing
- Institute
for Physical Science and Technology, Department of Chemistry and Biochemistry,
and Chemical Physics Program, University of Maryland, College Park, Maryland 20742, United States
- Department
of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - John D. Weeks
- Institute
for Physical Science and Technology, Department of Chemistry and Biochemistry,
and Chemical Physics Program, University of Maryland, College Park, Maryland 20742, United States
| |
Collapse
|
37
|
Song J, Franck J, Pincus P, Kim MW, Han S. Specific ions modulate diffusion dynamics of hydration water on lipid membrane surfaces. J Am Chem Soc 2014; 136:2642-9. [PMID: 24456096 PMCID: PMC3985948 DOI: 10.1021/ja4121692] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
![]()
Effects
of specific ions on the local translational diffusion of
water near large hydrophilic lipid vesicle surfaces were measured
by Overhauser dynamic nuclear polarization (ODNP). ODNP relies on
an unpaired electron spin-containing probe located at molecular or
surface sites to report on the dynamics of water protons within ∼10
Å from the spin probe, which give rise to spectral densities
for electron–proton cross-relaxation processes in the 10 GHz
regime. This pushes nuclear magnetic resonance relaxometry to more
than an order of magnitude higher frequencies than conventionally
feasible, permitting the measurement of water moving with picosecond
to subnanosecond correlation times. Diffusion of water within ∼10
Å of, i.e., up to ∼3 water layers around the spin probes
located on hydrophilic lipid vesicle surfaces is ∼5 times retarded
compared to the bulk water translational diffusion. This directly
reflects on the activation barrier for surface water diffusion, i.e.,
how tightly water is bound to the hydrophilic surface and surrounding
waters. We find this value to be modulated by the presence of specific
ions in solution, with its order following the known Hofmeister series.
While a molecular description of how ions affect the hydration structure
at the hydrophilic surface remains to be answered, the finding that
Hofmeister ions directly modulate the surface water diffusivity implies
that the strength of the hydrogen bond network of surface hydration
water is directly modulated on hydrophilic surfaces.
Collapse
Affiliation(s)
- Jinsuk Song
- Department of Chemistry and Biochemistry and ‡Materials and Physics Department, University of California, Santa Barbara , Santa Barbara, California 93106, United States
| | | | | | | | | |
Collapse
|
38
|
Patel AJ, Garde S. Efficient Method To Characterize the Context-Dependent Hydrophobicity of Proteins. J Phys Chem B 2014; 118:1564-73. [DOI: 10.1021/jp4081977] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Amish J. Patel
- Department
of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Shekhar Garde
- Howard P. Isermann Department of Chemical & Biological Engineering, and Center for Biotechnology & Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| |
Collapse
|
39
|
Liu J, Wang C, Guo P, Shi G, Fang H. Linear relationship between water wetting behavior and microscopic interactions of super-hydrophilic surfaces. J Chem Phys 2013; 139:234703. [DOI: 10.1063/1.4841815] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
|
40
|
Kumar V, Errington JR. Application of the interface potential approach to calculate the wetting properties of a water model system. MOLECULAR SIMULATION 2013. [DOI: 10.1080/08927022.2013.817672] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
41
|
|
42
|
Bagwell CL, Leonard DML, Griffiths JP, Moloney MG, Stratton NJ, Travers DP. Post-Polymerization Modification of Materials using Diaryldiazomethanes: Changes to Surface Macroscopic Properties. MACROMOL REACT ENG 2013. [DOI: 10.1002/mren.201200088] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Claire L. Bagwell
- Department of Chemistry, Chemistry Research Laboratory; The University of Oxford; 12 Mansfield Road Oxford OX1 3TA UK
| | - David M. L. Leonard
- Department of Chemistry, Chemistry Research Laboratory; The University of Oxford; 12 Mansfield Road Oxford OX1 3TA UK
| | - Jon-Paul Griffiths
- Oxford Advanced Surfaces Group Plc, Begbroke Centre for Innovation and Enterprise, Oxford University Begbroke Science Park; Sandy Lane Yarnton OX5 1PF UK
| | - Mark G. Moloney
- Department of Chemistry, Chemistry Research Laboratory; The University of Oxford; 12 Mansfield Road Oxford OX1 3TA UK
| | - Nick J. Stratton
- Department of Chemistry, Chemistry Research Laboratory; The University of Oxford; 12 Mansfield Road Oxford OX1 3TA UK
| | - Daniel P. Travers
- Department of Chemistry, Chemistry Research Laboratory; The University of Oxford; 12 Mansfield Road Oxford OX1 3TA UK
| |
Collapse
|
43
|
Effect of surface hydrophobicity on the dynamics of water at the nanoscale confinement: A molecular dynamics simulation study. Chem Phys 2013. [DOI: 10.1016/j.chemphys.2013.06.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
44
|
|
45
|
Azimi G, Dhiman R, Kwon HM, Paxson AT, Varanasi KK. Hydrophobicity of rare-earth oxide ceramics. NATURE MATERIALS 2013; 12:315-320. [PMID: 23333998 DOI: 10.1038/nmat3545] [Citation(s) in RCA: 206] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2012] [Accepted: 12/10/2012] [Indexed: 05/29/2023]
Abstract
Hydrophobic materials that are robust to harsh environments are needed in a broad range of applications. Although durable materials such as metals and ceramics, which are generally hydrophilic, can be rendered hydrophobic by polymeric modifiers, these deteriorate in harsh environments. Here we show that a class of ceramics comprising the entire lanthanide oxide series, ranging from ceria to lutecia, is intrinsically hydrophobic. We attribute their hydrophobicity to their unique electronic structure, which inhibits hydrogen bonding with interfacial water molecules. We also show with surface-energy measurements that polar interactions are minimized at these surfaces and with Fourier transform infrared/grazing-angle attenuated total reflection that interfacial water molecules are oriented in the hydrophobic hydration structure. Moreover, we demonstrate that these ceramic materials promote dropwise condensation, repel impinging water droplets, and sustain hydrophobicity even after exposure to harsh environments. Rare-earth oxide ceramics should find widespread applicability as robust hydrophobic surfaces.
Collapse
Affiliation(s)
- Gisele Azimi
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | | | | | | | | |
Collapse
|
46
|
Kim JY, Kim EK, Kim SS. Micro-nano hierarchical superhydrophobic electrospray-synthesized silica layers. J Colloid Interface Sci 2013; 392:376-381. [DOI: 10.1016/j.jcis.2012.09.075] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2012] [Revised: 09/14/2012] [Accepted: 09/17/2012] [Indexed: 10/27/2022]
|
47
|
Paxson AT, Varanasi KK. Self-similarity of contact line depinning from textured surfaces. Nat Commun 2013; 4:1492. [PMID: 23422660 PMCID: PMC3586717 DOI: 10.1038/ncomms2482] [Citation(s) in RCA: 125] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2012] [Accepted: 01/14/2013] [Indexed: 11/28/2022] Open
Abstract
The mobility of drops on surfaces is important in many biological and industrial processes, but the phenomena governing their adhesion, which is dictated by the morphology of the three-phase contact line, remain unclear. Here we describe a technique for measuring the dynamic behaviour of the three-phase contact line at micron length scales using environmental scanning electron microscopy. We examine a superhydrophobic surface on which a drop's adhesion is governed by capillary bridges at the receding contact line. We measure the microscale receding contact angle of each bridge and show that the Gibbs criterion is satisfied at the microscale. We reveal a hitherto unknown self-similar depinning mechanism that shows how some hierarchical textures such as lotus leaves lead to reduced pinning, and counter-intuitively, how some lead to increased pinning. We develop a model to predict adhesion force and experimentally verify the model's broad applicability on both synthetic and natural textured surfaces.
Collapse
Affiliation(s)
- Adam T. Paxson
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Kripa K. Varanasi
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| |
Collapse
|
48
|
Schwierz N, Horinek D, Liese S, Pirzer T, Balzer BN, Hugel T, Netz RR. On the relationship between peptide adsorption resistance and surface contact angle: a combined experimental and simulation single-molecule study. J Am Chem Soc 2012; 134:19628-38. [PMID: 23101566 DOI: 10.1021/ja304462u] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The force-induced desorption of single peptide chains from mixed OH/CH(3)-terminated self-assembled monolayers is studied in closely matched molecular dynamics simulations and atomic force microscopy experiments with the goal to gain microscopic understanding of the transition between peptide adsorption and adsorption resistance as the surface contact angle is varied. In both simulations and experiments, the surfaces become adsorption resistant against hydrophilic as well as hydrophobic peptides when their contact angle decreases below θ ≈ 50°-60°, thus confirming the so-called Berg limit established in the context of protein and cell adsorption. Entropy/enthalpy decomposition of the simulation results reveals that the key discriminator between the adsorption of different residues on a hydrophobic monolayer is of entropic nature and thus is suggested to be linked to the hydrophobic effect. By pushing a polyalanine peptide onto a polar surface, simulations reveal that the peptide adsorption resistance is caused by the strongly bound water hydration layer and characterized by the simultaneous gain of both total entropy in the system and total number of hydrogen bonds between water, peptide, and surface. This mechanistic insight into peptide adsorption resistance might help to refine design principles for anti-fouling surfaces.
Collapse
Affiliation(s)
- Nadine Schwierz
- Fachbereich für Physik, Freie Universität Berlin, 14195 Berlin, Germany
| | | | | | | | | | | | | |
Collapse
|
49
|
Vanzo D, Bratko D, Luzar A. Wettability of pristine and alkyl-functionalized graphane. J Chem Phys 2012; 137:034707. [DOI: 10.1063/1.4732520] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
50
|
Levesque M, Vuilleumier R, Borgis D. Scalar fundamental measure theory for hard spheres in three dimensions: Application to hydrophobic solvation. J Chem Phys 2012; 137:034115. [DOI: 10.1063/1.4734009] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
|