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Ghamari N, Ahmadi R, Sheikhzadeh MS, Afshar A. Development of PDMS/TiO 2/Ag 3PO 4 antibacterial coating on 316L/PDMS implants: Evaluation of superhydrophobicity, bio-corrosion, mechanical behaviour, surface nanostructure and chemistry. J Mech Behav Biomed Mater 2024; 150:106315. [PMID: 38100981 DOI: 10.1016/j.jmbbm.2023.106315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Revised: 12/05/2023] [Accepted: 12/07/2023] [Indexed: 12/17/2023]
Abstract
Nanocomposite coatings based on polydimethylsiloxane were developed by adding silver phosphate and titania nanoparticles with a PDMS pre-layer for 316L stainless steel. FTIR spectra and XRD patterns confirmed the synthesis of TiO2 and Ag3PO4 nanoparticles and nanocomposite coating. FESM and AFM images show that with the increase of Ag3PO4 nanoparticles, the roughness of coatings increased (Ra and Rq for adding 7 wt% of Ag3PO4 coating was 29 and 293 nm). The wettability results demonstrated that the presence of 7 wt% Ag3PO4 nanoparticles in the coating has the highest water contact angle (152 °). Nano-scratch results proved that creating a pre-layer of PDMS can increase the scratch resistance of PDMS + TiO2+Ag3PO4 nanocomposite coating (displacement and scratch coefficient were 408 nm and 0.07μΝ-1/2 with the pre-layer). Corrosion current density of 316lSS with PDMS + TiO2+Ag3PO4 coating was 0.00045 μA/cm2, while for 316LSS with pure PDMS coating was 0.00114 μA/cm2 at 37 °C in PBS solution. The Nyquist curves showed the diameter of the semicircle for the nanocomposite coating was larger than pure PDMS coating, which indicates the higher corrosion resistance of the nanocomposite coating (5.98 × 107 Ω). By increasing Ag3PO4 nanoparticles from 1 to 7 wt%, the number of E. coli bacteria in contact with the nanocomposite decreased significantly from 580000 to 31000 CFU/cm2. In the disk diffusion test, the largest inhibition zone was related to the nanocomposite coating with the addition of 7 wt% Ag3PO4 (23 mm). Therefore, the PDMS + TiO2+Ag3PO4 nanocomposite coating has improved properties such as superhydrophobicity, advanced mechanical behavior, bio-corrosion resistance, and antibacterial activity.
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Affiliation(s)
- Niloufar Ghamari
- Department of Materials Science and Engineering, Sharif University of Technology, Azadi Avenue, 14588, Tehran, Iran
| | - Reza Ahmadi
- Department of Materials Science and Engineering, Sharif University of Technology, Azadi Avenue, 14588, Tehran, Iran.
| | - Mohammad Sajjad Sheikhzadeh
- Department of Materials Science and Engineering, Sharif University of Technology, Azadi Avenue, 14588, Tehran, Iran
| | - Abdollah Afshar
- Department of Materials Science and Engineering, Sharif University of Technology, Azadi Avenue, 14588, Tehran, Iran
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Sanders SL, Douglas LD, Sill TE, Stewart K, Pieniazek N, Li C, Walters E, Al-Hashimi M, Fang L, Davidson RD, Banerjee S. Tetrapodal textured Janus textiles for accessible menstrual health. iScience 2023; 26:108224. [PMID: 38107878 PMCID: PMC10725076 DOI: 10.1016/j.isci.2023.108224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 09/15/2023] [Accepted: 10/12/2023] [Indexed: 12/19/2023] Open
Abstract
Menstruating individuals without access to adequate hygiene products often improvise with alternatives that pose health risks and limit their participation in society. We describe here a menstrual hygiene product based on low-cost materials, which are integrated onto fabrics to imbue unidirectional permeability. A body-facing "Janus" fabric top layer comprising ZnO tetrapods spray-coated onto polyester mosquito netting imparts hierarchical texturation, augmenting the micron-scale texturation derived from the weave of the underlying fabric. The asymmetric coating establishes a gradient in wettability, which underpins flash spreading and unidirectional permeability. The hygiene product accommodates a variety of absorptive media, which are sandwiched between the Janus layer and a second outward-facing coated densely woven fabric. An assembled prototype demonstrates outstanding ability to wick saline solutions and a menstrual fluid simulant while outperforming a variety of commercially alternatives. The results demonstrate a versatile menstrual health product that provides a combination of dryness, discretion, washability, and safety.
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Affiliation(s)
- Sarah L. Sanders
- Department of Chemistry, Texas A&M University, College Station, TX 77842-3012, USA
- Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77843-3003, USA
| | - Lacey D. Douglas
- Department of Chemistry, Texas A&M University, College Station, TX 77842-3012, USA
- Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77843-3003, USA
| | - Tiffany E. Sill
- Department of Chemistry, Texas A&M University, College Station, TX 77842-3012, USA
- Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77843-3003, USA
| | - Kaylyn Stewart
- Department of Chemistry, Texas A&M University, College Station, TX 77842-3012, USA
- Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77843-3003, USA
| | - Noah Pieniazek
- Department of Chemistry, Texas A&M University, College Station, TX 77842-3012, USA
- Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77843-3003, USA
| | - Chenxuan Li
- Department of Chemistry, Texas A&M University, College Station, TX 77842-3012, USA
| | - Eve Walters
- Department of Chemistry, Texas A&M University, College Station, TX 77842-3012, USA
- Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77843-3003, USA
| | | | - Lei Fang
- Department of Chemistry, Texas A&M University, College Station, TX 77842-3012, USA
| | - Rachel D. Davidson
- Department of Chemistry, Texas A&M University, College Station, TX 77842-3012, USA
- Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77843-3003, USA
| | - Sarbajit Banerjee
- Department of Chemistry, Texas A&M University, College Station, TX 77842-3012, USA
- Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77843-3003, USA
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Meng Y, Gao Y, Li J, Liu J, Wang X, Yu F, Wang T, Gao K, Zhang Z. Preparation and characterization of cross-linked waterborne acrylic /PTFE composite coating with good hydrophobicity and anticorrosion properties. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Effects of Snake-Bioinspired Surface Texture on the Finger-Sealing Performance under Varied Working Conditions. MACHINES 2022. [DOI: 10.3390/machines10070569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The tribological performance of the friction pair between the rotor and finger feet is a crucial index affecting the service life of finger seals. In recent years, the surface texture has attracted a considerable number of researchers owing to its extraordinary potential in improving antifriction and wear resistance. This paper, inspired by snakeskins, introduces three texture forms (e.g., diamond, ellipse, and hexagon) into the rotor. The effects on finger-sealing performance are analyzed by considering finger seals’ varied working conditions. First, a numerical model of textured finger seals under hydrodynamic lubrication is established based on the Reynolds equation. Then, the sealing performance analysis of textured finger seals is performed considering varied working conditions given rotation speed, pressure difference, seal clearance, and working temperature. The numerical results show that: (1) the textured domain produces a noticeable hydrodynamic pressure effect and cavitation, which effectively improves the bearing capacity of the fluid film; (2) the higher the rotation speed or the lower the inlet/outlet pressure difference, the stronger the dynamic pressure effect of textured finger seals and the better the antifriction and wear resistance; (3) for good antifriction and wear resistance of a textured finger seal, the seal clearance should be as shallow as possible (≤10 μm), and the working temperature should be as low as possible (≤120 °C); and (4) the ellipse texture has a higher average dimensionless pressure and a lower friction coefficient, which is superior to diamond and hexagon ones in terms of friction and wear performance.
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Esmeryan KD, Rangelov I, Chaushev TA. Hydrophobic soot nanoparticles as a non-cytotoxic motility activator of human spermatozoa. NANOSCALE ADVANCES 2022; 4:2806-2815. [PMID: 36132011 PMCID: PMC9417005 DOI: 10.1039/d2na00192f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Accepted: 04/22/2022] [Indexed: 05/04/2023]
Abstract
Sperm cryopreservation is vital in combating the human infertility, but regrettably, the toxicity of cryoprotectants and the occurrence of intracellular icing, osmotic shocks or shrinkage of the cells below a given threshold volume greatly affects the success rate of this technique. Using the virtue of nanotechnologies and depositing water-repellent soot nanoparticles on the inner walls of cryovials may outline new directions in the development of cryobiology, but doubts related to the soot's venomosity question its practical implementability. The scientific content of this article eliminates the existing apprehensions by analyzing the cytotoxicity of three types of rapeseed oil soot, differing in morphology, surface chemistry and zeta potential, towards human spermatozoa. Upon intermittent evaluations of the sperm motility within 270 min of incubation in vials comprising carbon nanoparticles, we reveal that this soot category is non-cytotoxic or at worst, faintly toxic to the gametes provided by twenty individuals. Enhanced progressive sperm motility is observed at ∼50-60% of patients following the soot treatments, which is attributed to electrostatic repulsions and biochemical alterations in the seminal plasma. These fascinating results open new horizons for incorporation of the rapeseed oil soot as a tool for functional preparation and activation of human spermatozoa preceding in vitro fertilization.
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Affiliation(s)
- Karekin D Esmeryan
- Acoustoelectronics Laboratory, Georgi Nadjakov Institute of Solid State Physics, Bulgarian Academy of Sciences 72, Tzarigradsko Chaussee Blvd. 1784 Sofia Bulgaria +359 2 979 5811
| | - Ivaylo Rangelov
- Research Department, Medical Center Neovitro OOD 20, Petko Y. Todorov Blvd. 1408 Sofia Bulgaria
| | - Todor A Chaushev
- Research Department, Medical Center Neovitro OOD 20, Petko Y. Todorov Blvd. 1408 Sofia Bulgaria
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Zhang Y, Liu T, Kang J, Guo N, Guo Z, Chen J, Yin Y. Design of Multi-Functional Superhydrophobic Coating via Bacterium-Induced Hierarchically Structured Minerals on Steel Surface. Front Microbiol 2022; 13:934966. [PMID: 35783444 PMCID: PMC9244379 DOI: 10.3389/fmicb.2022.934966] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Accepted: 05/19/2022] [Indexed: 11/25/2022] Open
Abstract
The fabrication of an eco-friendly, multi-functional, and mechanically robust superhydrophobic coating using a simple method has many practical applications. Here, inspired by shell nacre, the micro- or nano-scale surface roughness that is necessary for superhydrophobic coatings was formed via Bacillus subtilis–induced mineralization. The biomineralized film coated with hexadecyltrimethoxysilane (HDTMS) exhibited superhydrophobicity with water contact angles of 156°. The biomimetic HDTMS/calcite-coating showed excellent self-cleaning, anti-icing, and anti-corrosion performances. Furthermore, mechanically robust superhydrophobicity could be realized by hierarchically structured biomineralized surfaces at two different length scales, with a nano-structure roughness to provide water repellency and a micro-structure roughness to provide durability. Our design strategy may guide the development of “green” superhydrophobic coatings that need to retain effective multi-functional abilities in harsh marine environments.
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Affiliation(s)
- Yiwen Zhang
- College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai, China
| | - Tao Liu
- College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai, China
- *Correspondence: Tao Liu,
| | - Jian Kang
- State Key Laboratory of RAL, Northeastern University, Shenyang, China
| | - Na Guo
- College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai, China
| | - Zhangwei Guo
- College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai, China
| | - Jinghao Chen
- School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, Beijing, China
| | - Yansheng Yin
- Engineering Technology Research Center for Corrosion Control and Protection of Materials in Extreme Marine Environment, Guangzhou Maritime University, Guangzhou, China
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7
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Zhao K, Sun L. How to Compute the Contact Angle inside an Opaque Capillary Tube: A Universal Equation. ADVANCED THEORY AND SIMULATIONS 2022. [DOI: 10.1002/adts.202100474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Kaiqi Zhao
- State Key Laboratory of Mechanical Transmission School of Materials Science and Engineering Chongqing University Chongqing 400044 China
| | - Lidong Sun
- State Key Laboratory of Mechanical Transmission School of Materials Science and Engineering Chongqing University Chongqing 400044 China
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Ariati R, Sales F, Souza A, Lima RA, Ribeiro J. Polydimethylsiloxane Composites Characterization and Its Applications: A Review. Polymers (Basel) 2021; 13:polym13234258. [PMID: 34883762 PMCID: PMC8659928 DOI: 10.3390/polym13234258] [Citation(s) in RCA: 54] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2021] [Revised: 11/30/2021] [Accepted: 12/02/2021] [Indexed: 11/16/2022] Open
Abstract
Polydimethylsiloxane (PDMS) is one of the most promising elastomers due its remarkable proprieties such as good thermal stability, biocompatibility, corrosion resistance, flexibility, low cost, ease of use, chemically inertia, hyperplastic characteristics, and gas permeability. Thus, it can be used in areas such as microfluidic systems, biomedical devices, electronic components, membranes for filtering and pervaporation, sensors, and coatings. Although pure PDMS has low mechanical properties, such as low modulus of elasticity and strength, it can be improved by mixing the PDMS with other polymers and by adding particles or reinforcements. Fiber-reinforced PDMS has proved to be a good alternative to manufacturing flexible displays, batteries, wearable devices, tactile sensors, and energy harvesting systems. PDMS and particulates are often used in the separation of liquids from wastewater by means of porosity followed by hydrophobicity. Waxes such as beeswax and paraffin have proved to be materials capable of improving properties such as the hydrophobic, corrosion-resistant, thermal, and optical properties of PDMS. Finally, when blended with polymers such as poly (vinyl chloride-co-vinyl acetate), PDMS becomes a highly efficient alternative for membrane separation applications. However, to the best of our knowledge there are few works dedicated to the review and comparison of different PDMS composites. Hence, this review will be focused on PDMS composites, their respective applications, and properties. Generally, the combination of elastomer with fibers, particles, waxes, polymers, and others it will be discussed, with the aim of producing a review that demonstrates the wide applications of this material and how tailored characteristics can be reached for custom applications.
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Affiliation(s)
- Ronaldo Ariati
- ESTiG, Instituto Politécnico de Bragança, 5300-252 Bragança, Portugal; (R.A.); (F.S.); (J.R.)
| | - Flaminio Sales
- ESTiG, Instituto Politécnico de Bragança, 5300-252 Bragança, Portugal; (R.A.); (F.S.); (J.R.)
| | - Andrews Souza
- MEtRICs, Mechanical Engineering Department, Campus de Azurém, University of Minho, 4800-058 Guimarães, Portugal;
| | - Rui A. Lima
- MEtRICs, Mechanical Engineering Department, Campus de Azurém, University of Minho, 4800-058 Guimarães, Portugal;
- CEFT, Faculdade de Engenharia da Universidade do Porto (FEUP), Rua Roberto Frias, 4200-465 Porto, Portugal
- Correspondence:
| | - João Ribeiro
- ESTiG, Instituto Politécnico de Bragança, 5300-252 Bragança, Portugal; (R.A.); (F.S.); (J.R.)
- CIMO, Instituto Politécnico de Bragança, 5300-252 Bragança, Portugal
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9
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Almonte L, Pimentel C, Rodríguez‐Cañas E, Abad J, Fernández V, Colchero J. Rose petal effect: A subtle combination of nano‐scale roughness and chemical variability. NANO SELECT 2021. [DOI: 10.1002/nano.202100193] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Affiliation(s)
- Lisa Almonte
- Centro de Investigación en Óptica y Nanofísica Departamento de Física Universidad de Murcia Murcia Spain
| | - Carlos Pimentel
- Instituto Andaluz de Ciencias de la Tierra (CSIC‐UGR) Armilla Spain
| | - Enrique Rodríguez‐Cañas
- Laboratorio de Microscopía Electrónica de Barrido Instituto de Investigación Desarrollo e Innovación en Biotecnología Sanitaria de Elche (IDiBE) Universidad Miguel Hernández Elche Spain
| | - José Abad
- Applied Physics Department Technical University of Cartagena Cartagena Spain
| | - Victoria Fernández
- Department of Systems and Natural Resources School of Forest Engineering Technical University of Madrid Madrid Spain
| | - Jaime Colchero
- Centro de Investigación en Óptica y Nanofísica Departamento de Física Universidad de Murcia Murcia Spain
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Baldelli A, Ou J, Li W, Amirfazli A. Spray-On Nanocomposite Coatings: Wettability and Conductivity. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:11393-11410. [PMID: 32822195 DOI: 10.1021/acs.langmuir.0c01020] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Nanocomposite coatings, i.e., a combination of nanocompounds, and a polymer matrix together with suitable additives and solvents is a very versatile method for producing multifunctional coatings. Some of the most desired coating properties have a high repellency to liquids (e.g., superhydrophobic and/or superoleophobic) and electrical and thermal conductivities. From a practical perspective, coatings that can be sprayed are very suitable for large-scale production, conformity, and reduced time and cost. Carbon-based, metallic, and ceramic are the three groups of nanocompounds commonly used to formulate spray-on nanocomposite coatings. In this invited feature article, we discuss the applications, advantages, and challenges of using such nanocompounds to produce coatings with good water repellency or/and elevated electrical or/and thermal conductivities. We also discuss the role of additives and solvents briefly in relation to the properties of the coatings. Important spraying parameters, such as stand-off distance and its influence on the final coating properties, will also be examined. Our overall aim is to provide a guideline for the production of practical multifunctional nanocomposites utilizing carbon-based, metallic, or ceramic nanoparticles or nanofibers that covers both aspects of in-air wettability and conductivity under one umbrella.
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Affiliation(s)
- Alberto Baldelli
- School of Materials Engineering, Jiangsu University of Technology, Changzhou 213001, P. R. China
- Department of Mechanical Engineering University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - Junfei Ou
- School of Materials Engineering, Jiangsu University of Technology, Changzhou 213001, P. R. China
| | - Wen Li
- School of Materials Engineering, Jiangsu University of Technology, Changzhou 213001, P. R. China
| | - Alidad Amirfazli
- School of Materials Engineering, Jiangsu University of Technology, Changzhou 213001, P. R. China
- Department of Mechanical Engineering, York University, Toronto, Ontario M3J 1P3, Canada
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11
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From Extremely Water-Repellent Coatings to Passive Icing Protection—Principles, Limitations and Innovative Application Aspects. COATINGS 2020. [DOI: 10.3390/coatings10010066] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The severe environmental conditions in winter seasons and/or cold climate regions cause many inconveniences in our routine daily-life, related to blocked road infrastructure, interrupted overhead telecommunication, internet and high-voltage power lines or cancelled flights due to excessive ice and snow accumulation. With the tremendous and nature-inspired development of physical, chemical and engineering sciences in the last few decades, novel strategies for passively combating the atmospheric and condensation icing have been put forward. The primary objective of this review is to reveal comprehensively the major physical mechanisms regulating the ice accretion on solid surfaces and summarize the most important scientific breakthroughs in the field of functional icephobic coatings. Following this framework, the present article introduces the most relevant concepts used to understand the incipiency of ice nuclei at solid surfaces and the pathways of water freezing, considers the criteria that a given material has to meet in order to be labelled as icephobic and clarifies the modus operandi of superhydrophobic (extremely water-repellent) coatings for passive icing protection. Finally, the limitations of existing superhydrophobic/icephobic materials, various possibilities for their unconventional practical applicability in cryobiology and some novel hybrid anti-icing systems are discussed in detail.
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12
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Scalable fabrication of robust superhydrophobic membranes by one-step spray-coating for gravitational water-in-oil emulsion separation. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2019.115898] [Citation(s) in RCA: 55] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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13
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Esmeryan KD, Castano CE, Chaushev TA, Mohammadi R, Vladkova TG. Silver-doped superhydrophobic carbon soot coatings with enhanced wear resistance and anti-microbial performance. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.123880] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Abstract
Superhydrophobic surfaces have drawn attention from scientists and engineers because of their extreme water repellency. More interestingly, these surfaces have also demonstrated an infinite influence on civil engineering materials. In this feature article, the history of wettability theory is described firstly. The approaches to construct hierarchical micro/nanostructures such as chemical vapor deposition (CVD), electrochemical, etching, and flame synthesis methods are introduced. Then, the advantages and limitations of each method are discussed. Furthermore, the recent progress of superhydrophobicity applied on civil engineering materials and its applications are summarized. Finally, the obstacles and prospects of superhydrophobic civil engineering materials are stated and expected. This review should be of interest to scientists and civil engineers who are interested in superhydrophobic surfaces and novel civil engineering materials.
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Geraldi NR, Guan JH, Dodd LE, Maiello P, Xu BB, Wood D, Newton MI, Wells GG, McHale G. Double-sided slippery liquid-infused porous materials using conformable mesh. Sci Rep 2019; 9:13280. [PMID: 31527694 PMCID: PMC6746700 DOI: 10.1038/s41598-019-49887-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Accepted: 08/23/2019] [Indexed: 12/04/2022] Open
Abstract
Often wetting is considered from the perspective of a single surface of a rigid substrate and its topographical properties such as roughness or texture. However, many substrates, such as membranes and meshes, have two useful surfaces. Such flexible substrates also offer the potential to be formed into structures with either a double-sided surface (e.g. by joining the ends of a mesh as a tape) or a single-sided surface (e.g. by ends with a half-twist). When a substrate possesses holes, it is also possible to consider how the spaces in the substrate may be connected or disconnected. This combination of flexibility, holes and connectedness can therefore be used to introduce topological concepts, which are distinct from simple topography. Here, we present a method to create a Slippery Liquid-Infused Porous Surface (SLIPS) coating on flexible conformable doubled-sided meshes and for coating complex geometries. By considering the flexibility and connectedness of a mesh with the surface properties of SLIPS, we show it is possible to create double-sided SLIPS materials with high droplet mobility and droplet control on both faces. We also exemplify the importance of flexibility using a mesh-based SLIPS pipe capable of withstanding laminar and turbulent flows for 180 and 90 minutes, respectively. Finally, we discuss how ideas of topology introduced by the SLIPS mesh might be extended to create completely new types of SLIPS systems, such as Mobius strips and auxetic metamaterials.
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Affiliation(s)
- Nicasio R Geraldi
- School of Science and Technology, Nottingham Trent University, Nottingham, NG11 8NS, UK.
| | - Jian H Guan
- Smart Materials and Surfaces Laboratory, Faculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK
| | - Linzi E Dodd
- Smart Materials and Surfaces Laboratory, Faculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK
| | - Pietro Maiello
- Smart Materials and Surfaces Laboratory, Faculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK
| | - Ben B Xu
- Smart Materials and Surfaces Laboratory, Faculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK
| | - David Wood
- Smart Materials and Surfaces Laboratory, Faculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK
| | - Michael I Newton
- School of Science and Technology, Nottingham Trent University, Nottingham, NG11 8NS, UK
| | - Gary G Wells
- Smart Materials and Surfaces Laboratory, Faculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK
| | - Glen McHale
- Smart Materials and Surfaces Laboratory, Faculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK
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