1
|
Hao X, Yang Y, Dong S, Zheng H, Wang R. Robust superhydrophobic self-cleaning coating prepared by silane modified multi-walled carbon nanotubes: A combined experimental and molecular dynamics study. J Mol Graph Model 2024; 132:108831. [PMID: 39033601 DOI: 10.1016/j.jmgm.2024.108831] [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: 05/29/2024] [Revised: 06/28/2024] [Accepted: 07/16/2024] [Indexed: 07/23/2024]
Abstract
As a functional material, superhydrophobic coating has been widely studied in the field of self-cleaning. However, obtaining superhydrophobic coatings with robustness through simple preparation processes remains a challenge. In this paper, a robust superhydrophobic coating is prepared based on multi-walled carbon nanotubes modified by octyltrimethoxysilane, and its performance and hydrophobic mechanism are studied by experiments and molecular dynamics simulation. The superhydrophobic coating is prepared by one-step spraying method. The coating is characterized and analyzed by scanning electron microscopy and Fourier transform infrared spectroscopy, and the properties of the coating are tested by experiments. Molecular dynamics simulation is used in the study to construct a molecular model system, and the molecular modification mechanism and coating wettability are simulated under the COMPASSII force field. The results show that octyltrimethoxysilane successfully modified carbon nanotubes, and the hydroxyl groups at the head of the molecular chain are bound to the surface of the carbon nanotubes in the form of hydrogen bonds, while the tail of the molecular chain is far away from the surface. After modification, the surface of carbon nanotubes changed from hydrophilic to hydrophobic. The prepared superhydrophobic coating not only has excellent self-cleaning properties, but also exhibits corrosion resistance to acid and alkali solutions. The coating still has superhydrophobic when the wear length is in the range of 400 cm. It can be seen that a robust superhydrophobic self-cleaning coating is successfully prepared by a simple one-step spraying method. The modification mechanism and the hydrophobic mechanism of the coating were obtained by the combination of experiment and molecular dynamics simulation, which provided theoretical support for the superhydrophobic of the coating at the micro level.
Collapse
Affiliation(s)
- Xiaoru Hao
- School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo, 454003, PR China.
| | - Yulong Yang
- School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo, 454003, PR China
| | - Shilin Dong
- School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo, 454003, PR China
| | - Haikun Zheng
- School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo, 454003, PR China
| | - Ruirui Wang
- School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo, 454003, PR China
| |
Collapse
|
2
|
Li T, Peng Y, You H, Guan X, Lv J, Yang C. Recent Developments in the Fabrication and Application of Superhydrophobic Suraces. CHEM REC 2024:e202400065. [PMID: 39248661 DOI: 10.1002/tcr.202400065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2024] [Revised: 07/11/2024] [Indexed: 09/10/2024]
Abstract
A superhydrophobic surface is defined as having a contact angle exceeding 150 °C, indicating a remarkable ability to repel water. Generally, superhydrophobicity originates from the utilization of low-surface-energy materials with unique micro- and nanostructures. Superhydrophobic surfaces have gained considerable recognition and are widely employed in diverse areas for anti-icing, oil-water separation, anticorrosion, self-cleaning, blood-repellent, and antibacterial applications. These surfaces can greatly enhance industrial processes by yielding significant performance improvements. In this review, we introduce the basic theories that provide a foundation for understanding the hydrophobic properties of superhydrophobic surfaces. We then discuss current techniques for fabricating superhydrophobic coatings, critically analyzing their strengths and limitations. Furthermore, we provide an overview of recent progress in the application of superhydrophobic materials. Finally, we summarize the challenges in developing superhydrophobic materials and future trends in this field. The insights provided by this review can help researchers understand the basic knowledge of superhydrophobic surfaces and obtain the latest progress and challenges in the application of superhydrophobic surfaces. It provides help for further research and practical application of superhydrophobic surfaces.
Collapse
Affiliation(s)
- Ting Li
- School of Mechanical Engineering, Guizhou University, Guiyang, 550025, China
| | - Yi Peng
- School of Mechanical Engineering, Guizhou University, Guiyang, 550025, China
| | - Hang You
- School of Mechanical Engineering, Guizhou University, Guiyang, 550025, China
| | - Xiaoya Guan
- School of Mechanical Engineering, Guizhou University, Guiyang, 550025, China
| | - Jin Lv
- School of Mechanical Engineering, Guizhou University, Guiyang, 550025, China
| | - Chong Yang
- School of Mechanical Engineering, Guizhou University, Guiyang, 550025, China
| |
Collapse
|
3
|
Balasankar A, Venkatesan R, Jeong DY, Oh TH, Kim SC, Vetcher AA, Ramasundaram S. Facile Fabrication of Hierarchical Structured Anodic Aluminum Oxide Molds for Large-Scale Production of Superhydrophobic Polymer Films. Polymers (Basel) 2024; 16:2344. [PMID: 39204563 PMCID: PMC11359746 DOI: 10.3390/polym16162344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2024] [Revised: 08/08/2024] [Accepted: 08/12/2024] [Indexed: 09/04/2024] Open
Abstract
Anodized aluminum oxide (AAO) molds were used for the production of large-area and inexpensive superhydrophobic polymer films. A controlled anodization methodology was developed for the fabrication of hierarchical micro-nanoporous (HMN) AAO imprint molds (HMN-AAO), where phosphoric acid was used as both an electrolyte and a widening agent. Heat generated upon repetitive high-voltage (195 V) anodization steps is effectively dissipated by establishing a cooling channel. On the HMN-AAO, within the hemispherical micropores, arrays of hexagonal nanopores are formed. The diameter and depth of the micro- and nanopores are 18/8 and 0.3/1.25 µm, respectively. The gradual removal of micropatterns during etching in both the vertical and horizontal directions is crucial for fabricating HMN-AAO with a high aspect ratio. HMN-AAO rendered polycarbonate (PC) and polymethyl methacrylate (PMMA) films with respective water contact angles (WCAs) of 153° and 151°, respectively. The increase in the WCA is 80% for PC (85°) and 89% for PMMA (80°). On the PC and PMMA films, mechanically robust arrays of nanopillars are observed within the hemispherical micropillars. The micro-nanopillars on these polymer films are mechanically robust and durable. Regular nanoporous AAO molds resulted in only a hydrophobic polymer film (WCA = 113-118°). Collectively, the phosphoric acid-based controlled anodization strategy can be effectively utilized for the manufacturing of HMN-AAO molds and roll-to-roll production of durable superhydrophobic surfaces.
Collapse
Affiliation(s)
- Athinarayanan Balasankar
- Department of Physics, Gobi Arts and Science College, Gobichettipalayam 638453, India
- Nano-Hybrid Technology Research Center, Korea Electrotechnology Research Institute, 9 Beon-gil, 12 Bulmosan-gil, Seongsan-gu, Changwon 51543, Republic of Korea;
| | - Raja Venkatesan
- School of Chemical Engineering, Yeungnam University, 280 Daehak-Ro, Gyeongsan 38541, Republic of Korea; (T.H.O.); (S.-C.K.)
| | - Dae-Yeong Jeong
- Nano-Hybrid Technology Research Center, Korea Electrotechnology Research Institute, 9 Beon-gil, 12 Bulmosan-gil, Seongsan-gu, Changwon 51543, Republic of Korea;
- Nanoeco. Co., Ltd., Technology Start-up Center, Seongju-dong, 10 Jeongiyigil, Seongsan-ku, Changwon 50062, Republic of Korea
| | - Tae Hwan Oh
- School of Chemical Engineering, Yeungnam University, 280 Daehak-Ro, Gyeongsan 38541, Republic of Korea; (T.H.O.); (S.-C.K.)
| | - Seong-Cheol Kim
- School of Chemical Engineering, Yeungnam University, 280 Daehak-Ro, Gyeongsan 38541, Republic of Korea; (T.H.O.); (S.-C.K.)
| | - Alexandre A. Vetcher
- Institute of Biochemical Technology and Nanotechnology, Peoples’ Friendship University of Russia n.a. P. Lumumba (RUDN), 6 Miklukho-Maklaya St., 117198 Moscow, Russia;
| | - Subramaniyan Ramasundaram
- School of Chemical Engineering, Yeungnam University, 280 Daehak-Ro, Gyeongsan 38541, Republic of Korea; (T.H.O.); (S.-C.K.)
| |
Collapse
|
4
|
Patsidis AC, Dimitrakellis P, Gogolides E, Psarras GC. Dielectric Response of ZnO/PMMA Nanocomposites with Atmospheric Pressure Plasma-Modified Surfaces. MATERIALS (BASEL, SWITZERLAND) 2024; 17:4063. [PMID: 39203241 PMCID: PMC11356202 DOI: 10.3390/ma17164063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/11/2024] [Revised: 08/03/2024] [Accepted: 08/09/2024] [Indexed: 09/03/2024]
Abstract
In this work, the effect of etching the surface of polymer matrix nanocomposites with atmospheric pressure plasma targeting to achieve enhanced dielectric properties was investigated. Polymer nanocomposites, with varying reinforcing phase content, were modified by atmospheric-pressure plasma resulting in an increase in the surface filler's concentration. Polymethyl methacrylate (PMMA) matrix nanocomposites reinforced with zinc oxide (ZnO) nanoparticles were prepared and dielectrically studied as a function of the nanoparticle content and the plasma modified surfaces. The electrical response of the composite systems was studied by means of Broadband Dielectric Spectroscopy (BDS) over a wide range of temperatures and frequencies. The dielectric permittivity increased with the embedded phase content and with plasma surface treatment. Energy density followed the same trend as dielectric permittivity, and the plasma-treated nanocomposite with the higher ZnO content exhibited approximately 27% higher energy density compared to the unreinforced matrix.
Collapse
Affiliation(s)
- Anastasios C. Patsidis
- Smart Materials & Nanodielectrics Laboratory, Department of Materials Science, School of Natural Sciences, University of Patras, 26504 Patras, Greece;
| | - Panagiotis Dimitrakellis
- Institute of Nanoscience and Nanotechnology, NCSR “Demokritos”, Aghia Paraskevi, 15341 Attiki, Greece; (P.D.); (E.G.)
| | - Evangelos Gogolides
- Institute of Nanoscience and Nanotechnology, NCSR “Demokritos”, Aghia Paraskevi, 15341 Attiki, Greece; (P.D.); (E.G.)
| | - Georgios C. Psarras
- Smart Materials & Nanodielectrics Laboratory, Department of Materials Science, School of Natural Sciences, University of Patras, 26504 Patras, Greece;
| |
Collapse
|
5
|
Holzdörfer U, Ali W, Schollmeyer E, Gutmann JS, Mayer-Gall T, Textor T. Novel Approach for the Preparation of a Highly Hydrophobic Coating Material Exhibiting Self-Healing Properties. Molecules 2024; 29:3766. [PMID: 39202846 PMCID: PMC11357608 DOI: 10.3390/molecules29163766] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2024] [Revised: 08/05/2024] [Accepted: 08/06/2024] [Indexed: 09/03/2024] Open
Abstract
A concept to prepare a highly hydrophobic composite with self-healing properties has been designed and verified. The new material is based on a composite of a crystalline hydrophobic fluoro wax, synthesized from montan waxes and perfluoroethylene alcohols, combined with spherical silica nanoparticles equipped with a hydrophobic shell. Highly repellent layers were prepared using this combination of a hydrophobic crystalline wax and silica nanoparticles. The novel aspect of our concept was to prepare a ladder-like structure of the hydrophobic shell allowing the inclusion of a certain share of wax molecules. Wax molecules trapped in the hydrophobic structure during mixing are hindered from crystallizing; therefore, these molecules maintain a higher mobility compared to crystallized molecules. When a thin layer of the composite material is mechanically damaged, the mobile wax molecules can migrate and heal the defects to a certain extent. The general preparation of the composite is described and XRD analysis demonstrated that a certain share of wax molecules in the composite are hindered to crystallize. Furthermore, we show that the resulting material can recovery its repellent properties after surface damage.
Collapse
Affiliation(s)
- Uwe Holzdörfer
- Deutsches Textilforschungszentrum Nord-West gGmbH, Adlerstr. 1, 47798 Krefeld, Germany
| | - Wael Ali
- Deutsches Textilforschungszentrum Nord-West gGmbH, Adlerstr. 1, 47798 Krefeld, Germany
- Physikalische Chemie, Center for Nanointegration Duisburg-Essen, Universität Duisburg-Essen, Universitätsstraße 2, 45117 Essen, Germany
| | - Eckhard Schollmeyer
- Deutsches Textilforschungszentrum Nord-West gGmbH, Adlerstr. 1, 47798 Krefeld, Germany
| | - Jochen S. Gutmann
- Deutsches Textilforschungszentrum Nord-West gGmbH, Adlerstr. 1, 47798 Krefeld, Germany
- Physikalische Chemie, Center for Nanointegration Duisburg-Essen, Universität Duisburg-Essen, Universitätsstraße 2, 45117 Essen, Germany
| | - Thomas Mayer-Gall
- Deutsches Textilforschungszentrum Nord-West gGmbH, Adlerstr. 1, 47798 Krefeld, Germany
- Physikalische Chemie, Center for Nanointegration Duisburg-Essen, Universität Duisburg-Essen, Universitätsstraße 2, 45117 Essen, Germany
| | - Torsten Textor
- TEXOVERSUM School of Textiles, Reutlingen University, Alteburgstr. 150, 72762 Reutlingen, Germany
| |
Collapse
|
6
|
Xie X, Liu J, Li G, Zhang K, Wang X, Zheng Z, Wang X, Kaplan DL. Silk fibroin catheter with stable bioinspired inner-surfaces for inhibition of bioadhesion. Int J Biol Macromol 2024; 274:133271. [PMID: 38906349 DOI: 10.1016/j.ijbiomac.2024.133271] [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: 03/10/2024] [Revised: 06/11/2024] [Accepted: 06/18/2024] [Indexed: 06/23/2024]
Abstract
Biofilm formation on indwelling medical devices such as catheters and ventilators due to the adhesion of bacteria poses significant challenges in healthcare. Surface modification with micro- and nano-structures offers a promising strategy to prevent bioadhesion and is safer than surface chemical modification approaches. Here, catheters were prepared using silk fibroin (SF) hydrogels and an infusion molding method, with the inner surface featuring a micropapillae structure inspired by lotus leaves (SF-CMP). After phenylethanol (PEA) fumigation treatment, the resulting catheters (SF-CMP PEA) displayed improved swelling resistance and mechanical properties compared to methanol-treated catheters (SF-CMP MeOH). PEA was more efficient than methanol in controlling the size, distribution, and content of silk crystalline β-sheet blocks and thus the swelling and mechanical properties. Moreover, the micro-papillae structure on SF-CMP PEA remained stable over 35 days in solution, in contrast to SF-CMP MeOH, which lasted <7 days. SF-CMP PEA exhibited repellent effects against E. coli and S. aureusin vitro, and low cytotoxicity to the endothelial cells cultured on the unpatterned surface. Additionally, subcutaneous implantation studies showed reduced inflammation around the micropatterned samples compared to controls with a plain, unpatterned surface. The unique properties of SF-based materials, including tunable structures, biocompatibility, degradation, and drug-loading capability make them an attractive material for anti-bioadhesion in applications ranging from indwelling medical devices to tissue engineering scaffolds.
Collapse
Affiliation(s)
- Xusheng Xie
- National Engineering Laboratory for Modern Silk, Soochow University, Suzhou, Jiangsu Province 215123, PR China; Anhui Key Laboratory of Spin Electron and Nanomaterials of Anhui Higher Education Institues, Suzhou University, Suzhou, Anhui Province 234000, PR China
| | - Jian Liu
- National Engineering Laboratory for Modern Silk, Soochow University, Suzhou, Jiangsu Province 215123, PR China
| | - Gang Li
- National Engineering Laboratory for Modern Silk, Soochow University, Suzhou, Jiangsu Province 215123, PR China
| | - Keying Zhang
- Anhui Key Laboratory of Spin Electron and Nanomaterials of Anhui Higher Education Institues, Suzhou University, Suzhou, Anhui Province 234000, PR China
| | - Xiuli Wang
- College of Basic Medical Sciences, Dalian Medical University, Dalian, Liaoning Province 116044, PR China
| | - Zhaozhu Zheng
- National Engineering Laboratory for Modern Silk, Soochow University, Suzhou, Jiangsu Province 215123, PR China; Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing, Jiangsu Province 210096, PR China.
| | - Xiaoqin Wang
- National Engineering Laboratory for Modern Silk, Soochow University, Suzhou, Jiangsu Province 215123, PR China.
| | - David L Kaplan
- Department of Biomedical Engineering, Tufts University, Medford, MA 02155, USA
| |
Collapse
|
7
|
Cheng J, Zhu Y, Zhan F, Wang L. Lotus leaf-inspired thermal insulation and anti-icing topography. RSC Adv 2024; 14:18798-18806. [PMID: 38863814 PMCID: PMC11166188 DOI: 10.1039/d4ra02843k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2024] [Accepted: 05/29/2024] [Indexed: 06/13/2024] Open
Abstract
Porous sandwich-like structures with surface roughness possess the capacity to sustain droplets, diminish the area of contact between solids and liquids, and augment heat conductivity, and thus delay ice formation when the temperature drops below the freezing point. The prevalence of this combination of surface roughness and a hollow sandwich structure has been observed in several organisms, such as lotus leaves, which have developed these features as a result of environmental adaptation. This study introduces a new design for a surface consisting of a micro-nano conical array and a foam structure with a gradient of pores. The primary components of this design were isocyanate and polyether. The hollow gradient sandwich structure was created by manipulating the water content to increase the porosity, resulting in the formation of a conical-pit morphology on the underside of the specimen. This configuration significantly decreased the amount of heat lost and the modulus of elasticity of the sample. Additionally, the micro-nano hydrophobic structure on the upper surface hindered the transmission of temperature and delayed the formation of ice. This concept, inspired by natural structures, has significant potential applications in the areas of anti-icing, energy conservation, and environmental preservation.
Collapse
Affiliation(s)
- Jianjun Cheng
- Key Laboratory of Advanced Marine Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences Ningbo 315201 China
| | - Yi Zhu
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University Beijing 100083 China
| | - Fei Zhan
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University Beijing 100083 China
| | - Lei Wang
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University Beijing 100083 China
| |
Collapse
|
8
|
Wu Z, He J, Zhao G, Tang X, Li J, Chen W, Li R. Superhydrophilic PANI/Ag/TA@PVDF Composite Membrane with Antifouling Property for Oil-Water Separation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:11329-11339. [PMID: 38748512 DOI: 10.1021/acs.langmuir.4c01229] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2024]
Abstract
The current membrane materials used for oil-water separation suffer from low separation efficiency and poor durability, and membrane contamination is also a key issue that must be addressed urgently. In this paper, a superhydrophilic PANI/Ag/TA@PVDF composite membrane with PANI-Ag NPs heterojunction structure was prepared via chelation and reduction of Ag+ by tannic acid (TA) and in situ growth of hydrochloric acid-doped polyaniline (PANI). TA endows the prepared composite membrane with excellent superhydrophilicity and underwater oleophobicity, remarkable oil-water separation capacity (the separation efficiency of more than 97% for soybean oil), and extraordinary antifouling properties. Notably, the range of photodegradation is expanded from UV to visible light by the construction of a Schottky heterostructure between PANI and Ag NPs, the photocatalytic degradation ability of composite membrane for organic pollutants has been improved obviously, and the degradation efficiency for crystal violet (CV) is 97.9%. Considering these merits, the PANI/Ag/TA@PVDF composite membrane provides an effective strategy to overcome the shortcomings of existing membrane materials, presenting enormous potential in the treatment and purification of oily wastewater.
Collapse
Affiliation(s)
- Zhenmin Wu
- Key Laboratory of Superlight Materials and Surface Technology of Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, P. R. China
| | - Jie He
- Key Laboratory of Superlight Materials and Surface Technology of Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, P. R. China
| | - Guoyu Zhao
- Key Laboratory of Superlight Materials and Surface Technology of Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, P. R. China
| | - Xiaoyan Tang
- Key Laboratory of Superlight Materials and Surface Technology of Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, P. R. China
| | - Junqing Li
- Key Laboratory of Superlight Materials and Surface Technology of Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, P. R. China
| | - Wenhang Chen
- Key Laboratory of Superlight Materials and Surface Technology of Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, P. R. China
| | - Ruiqi Li
- Key Laboratory of Superlight Materials and Surface Technology of Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, P. R. China
| |
Collapse
|
9
|
Dai Z, Lei M, Ding S, Zhou Q, Ji B, Wang M, Zhou B. Durable superhydrophobic surface in wearable sensors: From nature to application. EXPLORATION (BEIJING, CHINA) 2024; 4:20230046. [PMID: 38855620 PMCID: PMC11022629 DOI: 10.1002/exp.20230046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Accepted: 10/02/2023] [Indexed: 06/11/2024]
Abstract
The current generation of wearable sensors often experiences signal interference and external corrosion, leading to device degradation and failure. To address these challenges, the biomimetic superhydrophobic approach has been developed, which offers self-cleaning, low adhesion, corrosion resistance, anti-interference, and other properties. Such surfaces possess hierarchical nanostructures and low surface energy, resulting in a smaller contact area with the skin or external environment. Liquid droplets can even become suspended outside the flexible electronics, reducing the risk of pollution and signal interference, which contributes to the long-term stability of the device in complex environments. Additionally, the coupling of superhydrophobic surfaces and flexible electronics can potentially enhance the device performance due to their large specific surface area and low surface energy. However, the fragility of layered textures in various scenarios and the lack of standardized evaluation and testing methods limit the industrial production of superhydrophobic wearable sensors. This review provides an overview of recent research on superhydrophobic flexible wearable sensors, including the fabrication methodology, evaluation, and specific application targets. The processing, performance, and characteristics of superhydrophobic surfaces are discussed, as well as the working mechanisms and potential challenges of superhydrophobic flexible electronics. Moreover, evaluation strategies for application-oriented superhydrophobic surfaces are presented.
Collapse
Affiliation(s)
- Ziyi Dai
- Joint Key Laboratory of the Ministry of EducationInstitute of Applied Physics and Materials EngineeringUniversity of MacauAvenida da UniversidadeTaipaMacauChina
- State Key Laboratory of Crystal MaterialsInstitute of Novel SemiconductorsSchool of MicroelectronicsShandong UniversityJinanChina
| | - Ming Lei
- Joint Key Laboratory of the Ministry of EducationInstitute of Applied Physics and Materials EngineeringUniversity of MacauAvenida da UniversidadeTaipaMacauChina
| | - Sen Ding
- Joint Key Laboratory of the Ministry of EducationInstitute of Applied Physics and Materials EngineeringUniversity of MacauAvenida da UniversidadeTaipaMacauChina
| | - Qian Zhou
- School of Physics and ElectronicsCentral South UniversityChangshaChina
| | - Bing Ji
- School of Physics and ElectronicsHunan Normal UniversityChangshaChina
| | - Mingrui Wang
- Department of Mechanical EngineeringUniversity of AucklandAucklandNew Zealand
| | - Bingpu Zhou
- Joint Key Laboratory of the Ministry of EducationInstitute of Applied Physics and Materials EngineeringUniversity of MacauAvenida da UniversidadeTaipaMacauChina
| |
Collapse
|
10
|
Kumar R, Rezapourian M, Rahmani R, Maurya HS, Kamboj N, Hussainova I. Bioinspired and Multifunctional Tribological Materials for Sliding, Erosive, Machining, and Energy-Absorbing Conditions: A Review. Biomimetics (Basel) 2024; 9:209. [PMID: 38667221 PMCID: PMC11048303 DOI: 10.3390/biomimetics9040209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2024] [Revised: 03/27/2024] [Accepted: 03/28/2024] [Indexed: 04/28/2024] Open
Abstract
Friction, wear, and the consequent energy dissipation pose significant challenges in systems with moving components, spanning various domains, including nanoelectromechanical systems (NEMS/MEMS) and bio-MEMS (microrobots), hip prostheses (biomaterials), offshore wind and hydro turbines, space vehicles, solar mirrors for photovoltaics, triboelectric generators, etc. Nature-inspired bionic surfaces offer valuable examples of effective texturing strategies, encompassing various geometric and topological approaches tailored to mitigate frictional effects and related functionalities in various scenarios. By employing biomimetic surface modifications, for example, roughness tailoring, multifunctionality of the system can be generated to efficiently reduce friction and wear, enhance load-bearing capacity, improve self-adaptiveness in different environments, improve chemical interactions, facilitate biological interactions, etc. However, the full potential of bioinspired texturing remains untapped due to the limited mechanistic understanding of functional aspects in tribological/biotribological settings. The current review extends to surface engineering and provides a comprehensive and critical assessment of bioinspired texturing that exhibits sustainable synergy between tribology and biology. The successful evolving examples from nature for surface/tribological solutions that can efficiently solve complex tribological problems in both dry and lubricated contact situations are comprehensively discussed. The review encompasses four major wear conditions: sliding, solid-particle erosion, machining or cutting, and impact (energy absorbing). Furthermore, it explores how topographies and their design parameters can provide tailored responses (multifunctionality) under specified tribological conditions. Additionally, an interdisciplinary perspective on the future potential of bioinspired materials and structures with enhanced wear resistance is presented.
Collapse
Affiliation(s)
- Rahul Kumar
- Department of Mechanical and Industrial Engineering, Tallinn University of Technology, Ehitajate Tee 5, 19086 Tallinn, Estonia; (M.R.); (H.S.M.); (N.K.); (I.H.)
| | - Mansoureh Rezapourian
- Department of Mechanical and Industrial Engineering, Tallinn University of Technology, Ehitajate Tee 5, 19086 Tallinn, Estonia; (M.R.); (H.S.M.); (N.K.); (I.H.)
| | - Ramin Rahmani
- CiTin–Centro de Interface Tecnológico Industrial, 4970-786 Arcos de Valdevez, Portugal;
- proMetheus–Instituto Politécnico de Viana do Castelo (IPVC), 4900-347 Viana do Castelo, Portugal
| | - Himanshu S. Maurya
- Department of Mechanical and Industrial Engineering, Tallinn University of Technology, Ehitajate Tee 5, 19086 Tallinn, Estonia; (M.R.); (H.S.M.); (N.K.); (I.H.)
- Department of Engineering Sciences and Mathematics, Luleå University of Technology, 97187 Luleå, Sweden
| | - Nikhil Kamboj
- Department of Mechanical and Industrial Engineering, Tallinn University of Technology, Ehitajate Tee 5, 19086 Tallinn, Estonia; (M.R.); (H.S.M.); (N.K.); (I.H.)
- Department of Mechanical and Materials Engineering, University of Turku, 20500 Turku, Finland
- TCBC–Turku Clinical Biomaterials Centre, Department of Biomaterials Science, Faculty of Medicine, Institute of Dentistry, University of Turku, 20014 Turku, Finland
| | - Irina Hussainova
- Department of Mechanical and Industrial Engineering, Tallinn University of Technology, Ehitajate Tee 5, 19086 Tallinn, Estonia; (M.R.); (H.S.M.); (N.K.); (I.H.)
| |
Collapse
|
11
|
Li Y, Xue Y, Wang J, Zhang D, Zhao Y, Liu JJ. Antibacterial Hydrophilic ZnO Microstructure Film with Underwater Oleophobic and Self-Cleaning Antifouling Properties. NANOMATERIALS (BASEL, SWITZERLAND) 2024; 14:150. [PMID: 38251115 PMCID: PMC10820557 DOI: 10.3390/nano14020150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2023] [Revised: 12/22/2023] [Accepted: 01/03/2024] [Indexed: 01/23/2024]
Abstract
Super-hydrophilic and oleophobic functional materials can prevent pollution or adsorption by repelling oil, and have good circulation. However, traditional strategies for preparing these functional materials either use expensive fabrication machines or contain possibly toxic organic polymers, which may prohibit the practical application. The research of multifunctional ZnO microstructures or nanoarrays thin films with super-hydrophilic, antifouling, and antibacterial properties has not been reported yet. Moreover, the exploration of underwater oleophobic and self-cleaning antifouling properties in ZnO micro/nanostructures is still in its infancy. Here, we prepared ZnO microstructured films on fluorine-doped tin oxide substrates (F-ZMF) for the development of advanced self-cleaning type super-hydrophilic and oleophobic materials. With the increase of the accelerators, the average size of the F-ZMF microstructures decreased. The F-ZMF shows excellent self-cleaning performance and hydrophilic (water contact angle ≤ 10°) and oleophobic characteristics in the underwater antifouling experiment. Under a dark condition, F-ZMF-4 showed good antibacterial effects against Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli) with inhibition rates of 99.1% and 99.9%, respectively. This study broadens the application scope of ZnO-based material and provides a novel prospect for the development of self-cleaning super-hydrophilic and oleophobic materials.
Collapse
Affiliation(s)
| | | | | | | | - Yan Zhao
- School of Physical Science and Technology, College of Energy Materials and Chemistry, Inner Mongolia University, Hohhot 010021, China; (Y.L.); (Y.X.); (J.W.); (D.Z.)
| | - Jun-Jie Liu
- School of Physical Science and Technology, College of Energy Materials and Chemistry, Inner Mongolia University, Hohhot 010021, China; (Y.L.); (Y.X.); (J.W.); (D.Z.)
| |
Collapse
|
12
|
Wang B, Xing L, Xing T, Chen G. Preparation of Superhydrophobic Fabric Based on Dopamine and Michael Addition under Ultraviolet Light. ACS OMEGA 2023; 8:46786-46793. [PMID: 38107972 PMCID: PMC10720011 DOI: 10.1021/acsomega.3c05738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Revised: 10/08/2023] [Accepted: 11/03/2023] [Indexed: 12/19/2023]
Abstract
This work reports a simple, stable, and environmentally friendly method to prepare durable superhydrophobic surfaces. First, a polydopamine coating is formed by oxidative polymerization of dopamine to form a secondary reaction platform to provide reaction sites for subsequent experiments. We applied a polydopamine layer onto a fiber surface using the Michael addition-reaction-grafted tetrakis (3-mercaptopropionic acid) pentaerythritol ester, followed by the introduction of tetraallyl silane and (mercapto) methyl siloxane-dimethyl siloxane copolymer on the polydopamine by a thiol-ene click-reaction under ultraviolet light. The resulting superhydrophobic Nylon 56 fabric exhibited a 166° static contact angle as well as excellent stability. The surface morphology of all samples was observed by field emission scanning electron microscope, X-ray photoelectron spectroscopy and energy dispersion spectroscopy, and the elemental composition and surface chemical state of the samples were analyzed. It also had the ability of oil-water separation. Fabric with such benefits broadens the applicability and innovation of superhydrophobic textiles for environmental and industrial applications.
Collapse
Affiliation(s)
- Baoliang Wang
- Soochow University, No. 199 Ren’ai Road, Suzhou Industrial Park, Jiangsu 215123, P.R. China
| | - Lili Xing
- Soochow University, No. 199 Ren’ai Road, Suzhou Industrial Park, Jiangsu 215123, P.R. China
| | - Tieling Xing
- Soochow University, No. 199 Ren’ai Road, Suzhou Industrial Park, Jiangsu 215123, P.R. China
| | - Guoqiang Chen
- Soochow University, No. 199 Ren’ai Road, Suzhou Industrial Park, Jiangsu 215123, P.R. China
| |
Collapse
|
13
|
Le Donne A, Littlefair JD, Tortora M, Merchiori S, Bartolomé L, Grosu Y, Meloni S. Hydrophobicity of molecular-scale textured surfaces: The case of zeolitic imidazolate frameworks, an atomistic perspective. J Chem Phys 2023; 159:184709. [PMID: 37955326 DOI: 10.1063/5.0173110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2023] [Accepted: 10/19/2023] [Indexed: 11/14/2023] Open
Abstract
Hydrophobicity has proven fundamental in an inexhaustible amount of everyday applications. Material hydrophobicity is determined by chemical composition and geometrical characteristics of its macroscopic surface. Surface roughness or texturing enhances intrinsic hydrophilic or hydrophobic characteristics of a material. Here we consider crystalline surfaces presenting molecular-scale texturing typical of crystalline porous materials, e.g., metal-organic frameworks. In particular, we investigate one such material with remarkable hydrophobic qualities, ZIF-8. We show that ZIF-8 hydrophobicity is driven not only by its chemical composition but also its sub-nanoscale surface corrugations, a physical enhancement rare amongst hydrophobes. Studying ZIF-8's hydrophobic properties is challenging as experimentally it is difficult to distinguish between the materials' and the macroscopic corrugations' contributions to the hydrophobicity. The computational contact angle determination is also difficult as the standard "geometric" technique of liquid nanodroplet deposition is prone to many artifacts. Here, we characterise ZIF-8 hydrophobicity via: (i) the "geometric" approach and (ii) the "energetic" method, utilising the Young-Dupré formula and computationally determining the liquid-solid adhesion energy. Both approaches reveal nanoscale Wenzel-like bathing of the corrugated surface. Moreover, we illustrate the importance of surface linker termination in ZIF-8 hydrophobicity, which reduces when varied from sp3 N to sp2 N termination. We also consider halogenated analogues of the methyl-imidazole linker, which promote the transition from nanoWenzel-like to nanoCassie-Baxter-like states, further enhancing surface hydrophobicity. Present results reveal the complex interface physics and chemistry between water and complex porous, molecular crystalline surfaces, providing a hint to tune their hydrophobicity.
Collapse
Affiliation(s)
- Andrea Le Donne
- Dipartimento di Scienze Chimiche, Farmaceutiche ed Agrarie (DOCPAS), Università degli Studi di Ferrara (Unife), Via Luigi Borsari 46, I-44121 Ferrara, Italy
| | - Josh D Littlefair
- Dipartimento di Scienze Chimiche, Farmaceutiche ed Agrarie (DOCPAS), Università degli Studi di Ferrara (Unife), Via Luigi Borsari 46, I-44121 Ferrara, Italy
| | - Marco Tortora
- Dipartimento di Ingegneria Meccanica e Aerospaziale, Universitá di Roma "Sapienza," Via Eudossiana 18, 00184 Rome, Italy
| | - Sebastiano Merchiori
- Dipartimento di Scienze Chimiche, Farmaceutiche ed Agrarie (DOCPAS), Università degli Studi di Ferrara (Unife), Via Luigi Borsari 46, I-44121 Ferrara, Italy
| | - Luis Bartolomé
- Centre for Cooperative Research on Alternative Energies (CIC energiGUNE), Basque Research and Technology Alliance (BRTA), Alava Technology Park, Albert Einstein 48, 01510 Vitoria-Gasteiz, Spain
| | - Yaroslav Grosu
- Centre for Cooperative Research on Alternative Energies (CIC energiGUNE), Basque Research and Technology Alliance (BRTA), Alava Technology Park, Albert Einstein 48, 01510 Vitoria-Gasteiz, Spain
- Institute of Chemistry, University of Silesia in Katowice, Szkolna 9, 40-006 Katowice, Poland
| | - Simone Meloni
- Dipartimento di Scienze Chimiche, Farmaceutiche ed Agrarie (DOCPAS), Università degli Studi di Ferrara (Unife), Via Luigi Borsari 46, I-44121 Ferrara, Italy
| |
Collapse
|
14
|
Jia D, Lin Y, Zou Y, Zhang Y, Yu Q. Recent Advances in Dual-Function Superhydrophobic Antibacterial Surfaces. Macromol Biosci 2023; 23:e2300191. [PMID: 37265089 DOI: 10.1002/mabi.202300191] [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: 05/04/2023] [Revised: 05/31/2023] [Indexed: 06/03/2023]
Abstract
Bacterial adhesion and subsequent biofilm formation on the surfaces of synthetic materials imposes a significant burden in various fields, which can lead to infections in patients or reduce the service life of industrial devices. Therefore, there is increasing interest in imbuing surfaces with antibacterial properties. Bioinspired superhydrophobic surfaces with high water contact angles (>150°) exhibit excellent surface repellency against contaminations, thereby preventing initial bacterial adhesion and inhibiting biofilm formation. However, conventional superhydrophobic surfaces typically lack long-term durability and are incapable of achieving persistent efficacy against bacterial adhesion. To overcome these limitations, in recent decades, dual-function superhydrophobic antibacterial surfaces with both bacteria-repelling and bacteria-killing properties have been developed by introducing bactericidal components. These surfaces have demonstrated improved long-term antibacterial performance in addressing the issues associated with surface-attached bacteria. This review summarizes the recent advancements of these dual-function superhydrophobic antibacterial surfaces. First, a brief overview of the fabrication strategies and bacteria-repelling mechanism of superhydrophobic surfaces is provided and then the dual-function superhydrophobic antibacterial surfaces are classified into three types based on the bacteria-killing mechanism: i) mechanotherapy, ii) chemotherapy, and iii) phototherapy. Finally, the limitations and challenges of current research are discussed and future perspectives in this promising area are proposed.
Collapse
Affiliation(s)
- Dongxu Jia
- Department of Cardiovascular Surgery of the First Affiliated Hospital and Institute for Cardiovascular Science, Suzhou Medical College of Soochow University, Soochow University, Suzhou, 215000, P. R. China
- State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, P. R. China
| | - Yuancheng Lin
- State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, P. R. China
| | - Yi Zou
- State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, P. R. China
| | - Yanxia Zhang
- Department of Cardiovascular Surgery of the First Affiliated Hospital and Institute for Cardiovascular Science, Suzhou Medical College of Soochow University, Soochow University, Suzhou, 215000, P. R. China
| | - Qian Yu
- State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, P. R. China
| |
Collapse
|
15
|
Zhao M, Shang Y, Xiong Y, Zhang X. Reusable, Stable, Efficient and Multifunctional Superhydrophobic and Oleophilic Polyurethane Sponge for Oil-Water Separation Prepared Using Discarded Composite Insulator. MATERIALS (BASEL, SWITZERLAND) 2023; 16:6320. [PMID: 37763597 PMCID: PMC10532702 DOI: 10.3390/ma16186320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2023] [Revised: 09/17/2023] [Accepted: 09/19/2023] [Indexed: 09/29/2023]
Abstract
Oil spills and chemical leakages are a serious source of pollution in oceans and rivers, and have attracted worldwide attention. Many scientists are currently engaged in the development of oil-water separation technology. In this study, the umbrella skirt of a discarded silicone rubber insulator was utilized as feedstock, and polydimethylsiloxane (PDMS) was employed to immobilize the prepared powder (FXBW) onto a polyurethane (PU) sponge skeleton. Without any modifications using chemical reagents, a novel oil-water separation material, FXBW-PU, was developed, with a water contact angle of 155.3°. The FXBW-PU sponge exhibited an absorption capacity ranging from 11.79 to 26.59 g/g for various oils and organic solvents, while maintaining an excellent selective adsorption performance, even after undergoing ten compression cycles, due to its exceptional chemical and mechanical stability. With the assistance of a vacuum pump, the FXBW-PU sponge was utilized in a continuous separation apparatus, resulting in a separation efficiency exceeding 98.6% for various oils and organic solvents. The separation efficiency of n-hexane remains as high as 99.2% even after 10 consecutive separation cycles. Notably, the FXBW-PU sponge also separated the dichloromethane-in-water emulsions, which achieved the effect of purifying water. In summary, FXBW-PU sponge has great potential in the field of cleaning up oil/organic solvent contamination due to its low preparation cost, environmental friendliness and excellent performance.
Collapse
Affiliation(s)
- Meiyun Zhao
- Hubei Key Laboratory of Hydroelectric Machinery Design & Maintenace, China Three Gorges University, Yichang 443000, China; (M.Z.)
- College of Mechanical & Power Engineering, China Three Gorges University, Yichang 443000, China
| | - Yuanyuan Shang
- Hubei Key Laboratory of Hydroelectric Machinery Design & Maintenace, China Three Gorges University, Yichang 443000, China; (M.Z.)
| | - Yufan Xiong
- Hubei Key Laboratory of Hydroelectric Machinery Design & Maintenace, China Three Gorges University, Yichang 443000, China; (M.Z.)
| | - Xiaolong Zhang
- Hubei Key Laboratory of Hydroelectric Machinery Design & Maintenace, China Three Gorges University, Yichang 443000, China; (M.Z.)
| |
Collapse
|
16
|
Li J, Ding S, Wu J, Guo Z. Underwater Superoleophobic and Underoil Superhydrophilic Copper Benzene-1,3,5-tricarboxylate (HKUST-1) Mesh for Self-Cleaning and On-Demand Emulsion Separation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:6201-6210. [PMID: 37083365 DOI: 10.1021/acs.langmuir.3c00331] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Surfaces with underoil superhydrophilic (UOSHL) and underwater superoleophobic (UWOHB) have great potential for on-demand emulsion separation. However, the fabrication of underoil superhydrophilic based on wetting thermodynamic principles is quite challenging. Several previous studies have shown that some sarcocarps are able to spontaneously absorb water to moisturize themselves and have a unique UOSHL ability. By mimicking this unique ability of the sarcocarp, an outstanding UWOHB and UOSHL membrane was prepared. We choose 2300 mesh stainless steel mesh (SSM) as the substrate, then grow Cu and Cu(OH)2 on SSM by a simple electrochemical method, and finally grow HKUST-1 crystals via a fast in situ growth method. The whole preparation process is simple, low cost, and does not require complex and long-term hydrothermal reactions. By growing HKUST-1 crystals, the prepared surface successfully achieved the required UOSHL and UWOHB properties. When the water droplets come into contact with the membrane under n-hexane, it will diffuse and can completely spread out in 2 s. The as-prepared membrane exhibits outstanding anti-fouling and self-cleaning properties for rapeseed oil and crude oil with high viscosity underwater due to the special wetting. By prewetting the surface with an appropriate amount of the dispersion medium, it can rapidly and efficiently on-demand separate different emulsions. The separation efficiencies of water-in-oil emulsions and oil-in-water emulsions are above 99.00 and 97.00%. With their outstanding performance in self-cleaning, on-demand emulsion separation, low cost, and fast preparation, the as-prepared UOSHL and UWOHB HKUST-1 meshes show excellent potential for treating oily wastewater in practical applications.
Collapse
Affiliation(s)
- Jiahao Li
- Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, Wuhan 430062, People's Republic of China
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - Sili Ding
- Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, Wuhan 430062, People's Republic of China
| | - Jun Wu
- Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, Wuhan 430062, People's Republic of China
| | - Zhiguang Guo
- Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, Wuhan 430062, People's Republic of China
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| |
Collapse
|
17
|
Catley T, Corrigan RM, Parnell AJ. Designing Effective Antimicrobial Nanostructured Surfaces: Highlighting the Lack of Consensus in the Literature. ACS OMEGA 2023; 8:14873-14883. [PMID: 37151499 PMCID: PMC10157858 DOI: 10.1021/acsomega.2c08068] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Accepted: 04/07/2023] [Indexed: 05/09/2023]
Abstract
Research into nanostructured materials, inspired by the topography of certain insect wings, has provided a potential pathway toward drug-free antibacterial surfaces, which may be vital in the ongoing battle against antimicrobial resistance. However, to produce viable antibacterial nanostructured surfaces, we must first understand the bactericidal mechanism of action and how to optimize them to kill the widest range of microorganisms. This review discusses the parameters of nanostructured surfaces that have been shown to influence their bactericidal efficiency and highlights the highly variable nature of many of the findings. A large-scale analysis of the literature is also presented, which further shows a lack of clarity in what is understood about the factors influencing bactericidal efficiency. The potential reasons for the ambiguity, including how the killing effect may be a result of multiple factors and issues with nonstandardized testing of the antibacterial properties of nanostructured surfaces, are then discussed. Finally, a standard method for testing of antimicrobial killing is proposed that will allow comparison between studies and enable a deeper understanding about nanostructured surfaces and how to optimize their bactericidal efficiency.
Collapse
Affiliation(s)
- Thomas
E. Catley
- Department
of Physics and Astronomy, University of
Sheffield, Hicks Building, Hounsfield Road, Sheffield S3 7RH, United Kingdom
| | - Rebecca M. Corrigan
- Molecular
Microbiology, School of Biosciences, University
of Sheffield, Firth Court, Sheffield S10 2TN, United Kingdom
| | - Andrew J. Parnell
- Department
of Physics and Astronomy, University of
Sheffield, Hicks Building, Hounsfield Road, Sheffield S3 7RH, United Kingdom
| |
Collapse
|
18
|
Kodihalli Shivaprakash N, Banerjee PS, Banerjee SS, Barry C, Mead J. Advanced polymer processing technologies for micro‐ and nanostructured surfaces: A review. POLYM ENG SCI 2023. [DOI: 10.1002/pen.26280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2023]
Affiliation(s)
| | - Pratip Sankar Banerjee
- Department of Materials Science and Engineering Indian Institute of Technology Delhi New Delhi India
| | - Shib Shankar Banerjee
- Department of Materials Science and Engineering Indian Institute of Technology Delhi New Delhi India
| | - Carol Barry
- Nanomanufacturing Center, Department of Plastic Engineering University of Massachusetts Lowell Lowell Massachusetts USA
| | - Joey Mead
- Nanomanufacturing Center, Department of Plastic Engineering University of Massachusetts Lowell Lowell Massachusetts USA
| |
Collapse
|
19
|
Wang Q, Liu C, Wang H, Yin K, Yu Z, Wang T, Ye M, Pei X, Liu X. Laser-Heat Surface Treatment of Superwetting Copper Foam for Efficient Oil-Water Separation. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:736. [PMID: 36839104 PMCID: PMC9965063 DOI: 10.3390/nano13040736] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Revised: 02/13/2023] [Accepted: 02/14/2023] [Indexed: 06/18/2023]
Abstract
Oil pollution in the ocean has been a great threaten to human health and the ecological environment, which has raised global concern. Therefore, it is of vital importance to develop simple and efficient techniques for oil-water separation. In this work, a facile and low-cost laser-heat surface treatment method was employed to fabricate superwetting copper (Cu) foam. Nanosecond laser surface texturing was first utilized to generate micro/nanostructures on the skeleton of Cu foam, which would exhibit superhydrophilicity/superoleophilicity. Subsequently, a post-process heat treatment would reduce the surface energy, thus altering the surface chemistry and the surface wettability would be converted to superhydrophobicity/superoleophilicity. With the opposite extreme wetting scenarios in terms of water and oil, the laser-heat treated Cu foam can be applied for oil-water separation and showed high separation efficiency and repeatability. This method can provide a simple and convenient avenue for oil-water separation.
Collapse
Affiliation(s)
- Qinghua Wang
- School of Mechanical Engineering, Southeast University, Nanjing 211189, China
- State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China
| | - Chao Liu
- School of Mechanical Engineering, Southeast University, Nanjing 211189, China
| | - Huixin Wang
- Institute of Agricultural Facilities and Equipment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
- Key Laboratory of Protected Agriculture Engineering in the Middle and Lower Reaches of Yangtze River, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China
| | - Kai Yin
- State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China
| | - Zhongjie Yu
- School of Mechanical Engineering, Southeast University, Nanjing 211189, China
| | - Taiyuan Wang
- School of Mechanical Engineering, Southeast University, Nanjing 211189, China
| | - Mengqi Ye
- School of Mechanical Engineering, Southeast University, Nanjing 211189, China
| | - Xianjun Pei
- School of Mechanical Engineering, Southeast University, Nanjing 211189, China
| | - Xiaochao Liu
- School of Mechanical Engineering, Southeast University, Nanjing 211189, China
| |
Collapse
|
20
|
Wang L. A critical review on robust self-cleaning properties of lotus leaf. SOFT MATTER 2023; 19:1058-1075. [PMID: 36637093 DOI: 10.1039/d2sm01521h] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
The robust self-cleaning of a lotus leaf is the most classic and powerful phenomenon in nature, whose hybrid papillae and biological wax guarantee its functions. The stability of the lotus leaf surface function is determined by its overall structural design, and is also the fundamental reason for its long-term survival in the natural environment. In fact, the durability of lotus leaf surface function is facilitated by the coordination of many factors which is why it is challenging to be investigated using bionic technology. In this review, we comprehensively examined the synergistic effects of flexible characteristics, surface topography, hollow interlayers, leaf shape, and bent petioles on the structural stability of the lotus leaf surface. The key significance of these factors is in transferring the stress and strain on the surface downwards, reducing the load on the surface, improving the durability of the self-cleaning function, and ultimately ensuring respiration and photosynthesis of leaves in the natural environment. This comprehensive scrutiny offers a novel classical bionic scheme for enhancing the structural stability of a surface, which has potential for applications in deepwater self-cleaning, anti-drag, anti-icing, thermal insulation, and mechanical enhancement of membranes and buildings.
Collapse
Affiliation(s)
- Lei Wang
- Beijing Key Laboratory of Cryo-Biomedical Engineering, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
| |
Collapse
|
21
|
Mendrek B, Oleszko-Torbus N, Teper P, Kowalczuk A. Towards a modern generation of polymer surfaces: nano- and microlayers of star macromolecules and their design for applications in biology and medicine. Prog Polym Sci 2023. [DOI: 10.1016/j.progpolymsci.2023.101657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
|
22
|
Mohamed ME, Mekhaiel PS, Mahgoub FM. Construction of superhydrophobic graphene-based coating on steel substrate and its ultraviolet durability and corrosion resistance properties. Sci Rep 2023; 13:590. [PMID: 36631523 PMCID: PMC9834389 DOI: 10.1038/s41598-023-27647-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Accepted: 01/05/2023] [Indexed: 01/13/2023] Open
Abstract
For the first time, a facile and environmentally friendly approach for producing high-quality graphene from the biomass of banana leaves is described in this paper. Two rough coats of Ni-graphene, Ni@G, and Ni-graphene doped with chromium, Ni@Cr-G, were created on steel substrates by electrostatic deposition. These coatings were then submerged in an ethanolic solution of myristic acid, MA, to produce a superhydrophobic, SHP, surface. The Raman spectra demonstrated that the generated graphene was of high quality. Fourier transform infrared spectroscopy findings confirm the modification of the Ni@G coating by MA, Ni@G@MA, and the modification of the Ni@Cr-G composite with MA, Ni@Cr-G@MA. The results of the scanning electron microscope revealed that the created SHP coatings have nanoscale features. The wettability results showed that the water contact angle values for Ni@G@MA and Ni@Cr-G@MA coatings are 158° and 168°, while the water sliding angle values for both coatings are 4.0 o and 1.0°, respectively. The atomic force microscopy results show that both Ni@G and Ni@Cr-G coatings increase the roughness of the steel. The chemical and mechanical stability of the Ni@Cr-G@MA coating was higher than those of the Ni@G@MA coating. The coated steel by Ni@Cr-G@MA exhibits UV stability up to 110 h, while the SHP-coated steel by Ni@G@MA exhibits UV stability for 60 h. The potentiodynamic polarization results show that the value of the corrosion current density for bare steel is 13 times that of steel coated with Ni@G@MA, and 21 times that of coated steel with Ni@Cr-G@MA. The electrochemical impedance spectroscopy, EIS, results show that the charge transfer resistance for steel coated with Ni@G@MA is 38 times that of bare steel, while steel coated with Ni@Cr-G@MA is 57 times that of bare steel. Potentiodynamic polarization and EIS results show that the SHP Ni@Cr-G@MA film exhibits higher corrosion resistance than Ni@G@MA film.
Collapse
Affiliation(s)
- M. E. Mohamed
- grid.7155.60000 0001 2260 6941Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt
| | - P. S. Mekhaiel
- grid.7155.60000 0001 2260 6941Materials Science Department, Institute of Graduate Studies & Research, Alexandria University, Alexandria, Egypt
| | - F. M. Mahgoub
- grid.7155.60000 0001 2260 6941Materials Science Department, Institute of Graduate Studies & Research, Alexandria University, Alexandria, Egypt
| |
Collapse
|
23
|
Varol HS, Seeger S. Droplet Size-Assisted Polysiloxane Architecting. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:377-388. [PMID: 36527409 DOI: 10.1021/acs.langmuir.2c02607] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
(Super)antiwetting shielding around engineering materials and protecting them against harsh environmental conditions have been achieved via growing various geometry polysiloxane (or silicone) patterns around them by using a droplet-assisted growth method, where the polymerization takes place inside of the water droplets acting as reaction vessels. The size and distribution of these reaction vessels are the main factors in making different geometry silicone patterns; however, very little is known about the fate of these droplets throughout the polymerization. Here, we propose keeping the relative humidity (% RH) inside the reactor stable throughout the polymerization as a new coating parameter to force the size of the reaction vessel water droplets to be the same for building simply shaped silicone rods with controlled geometry and distribution. In this manner, we grew simple geometry cylindric microrods on surfaces and could tune their length, diameter, inter-rod spacing, and thus the (super)hydrophobicity. Here, we also demonstrate that with changes in the amplitude and stability of the % RH, it is possible to fabricate different (super)hydrophobic nanograsses, conical silicone microrods, and isotropic silicone nanofilaments. The proposed new way of tuning initial and in situ reaction vessel droplet size can be used as a single factor to formulate different geometry silicone patterns with tunable dimensions, leading to different roughness and hydrophobicity. To a certain extent, the droplet size-assisted silicone shaping in this work provides a new way to control the length, diameter, morphology, inter-rod spacing, and thus the (super)hydrophobicity of the silicone patterns, especially those in the shape of simple cylindrical microrods. This control over silicone architecting will help to prepare new (super)hydrophobic coatings with more controlled morphology and thus wettability; on the contrary, it will support surface scientists modeling the connection between surface geometry and (super)antiwetting of such irregular pillared surfaces that remain elusive.
Collapse
Affiliation(s)
- H Samet Varol
- Department of Chemistry, Universität Zürich, ZürichCH 8057, Switzerland
- Ernst-Berl Institut für Technische und Makromolekulare Chemie, Technische Universität Darmstadt, DarmstadtD-64287, Germany
| | - Stefan Seeger
- Department of Chemistry, Universität Zürich, ZürichCH 8057, Switzerland
| |
Collapse
|
24
|
Pompilio M, Ierides I, Cacialli F. Biomimetic Approaches to "Transparent" Photovoltaics: Current and Future Applications. Molecules 2022; 28:180. [PMID: 36615373 PMCID: PMC9822409 DOI: 10.3390/molecules28010180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Revised: 11/18/2022] [Accepted: 11/24/2022] [Indexed: 12/28/2022] Open
Abstract
There has been a surge in the interest for (semi)transparent photovoltaics (sTPVs) in recent years, since the more traditional, opaque, devices are not ideally suited for a variety of innovative applications spanning from smart and self-powered windows for buildings to those for vehicle integration. Additional requirements for these photovoltaic applications are a high conversion efficiency (despite the necessary compromise to achieve a degree of transparency) and an aesthetically pleasing design. One potential realm to explore in the attempt to meet such challenges is the biological world, where evolution has led to highly efficient and fascinating light-management structures. In this mini-review, we explore some of the biomimetic approaches that can be used to improve both transparent and semi-transparent photovoltaic cells, such as moth-eye inspired structures for improved performance and stability or tunable, coloured, and semi-transparent devices inspired by beetles' cuticles. Lastly, we briefly discuss possible future developments for bio-inspired and potentially bio-compatible sTPVs.
Collapse
|
25
|
Li Yang, Liu J, Mai C, Lv C, Guo Y, Zhao L, Jiang Y, Zhang H. Effect of Nanoparticle-Filled Lubricant Layer on Fluoropolymer Slippery Liquid-Infused Porous Surface. POLYMER SCIENCE SERIES B 2022. [DOI: 10.1134/s1560090422700609] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
|
26
|
Exploring chemical and structural features to tailor wetting properties of PVDF and PVDF/PMMA surfaces. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.125441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
27
|
Peng Y, Shang J, Liu C, Zhao S, Huang C, Bai Y, Li Y. A universal replica molding strategy based on natural bio-templates for fabrication of robust superhydrophobic surfaces. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.130879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
|
28
|
Chen C, Peng X. Constructing Superhydrophobic Sands Layer with PTFE Nanocoating for Desert Water Storage and Oil/Water Separation. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.130517] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
29
|
Huang Y, Zhao Z, Liu H, Zou X, Wang J. Two combination strategies of coordinated silicon elastomer and modified nano-silica to fabricate self-healing hybrid coating@fabrics with high oil-water separation capabilities. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.130685] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
30
|
Helal Hossain MD, Hossain N, Asaduzzaman Chowdhury M, Arefin Kowser M, Masud Rana M. Surface Synthesization of Magnesium Alloys for Improving Corrosion Resistance and Implant Applications. ARAB J CHEM 2022. [DOI: 10.1016/j.arabjc.2022.104465] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
|
31
|
Ragheb DM, Abdel-Gaber AM, Mahgoub FM, Mohamed ME. Eco-friendly method for construction of superhydrophobic graphene-based coating on copper substrate and its corrosion resistance performance. Sci Rep 2022; 12:17929. [PMID: 36289322 PMCID: PMC9605987 DOI: 10.1038/s41598-022-22915-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2022] [Accepted: 10/20/2022] [Indexed: 11/22/2022] Open
Abstract
In this work, Ni and Ni-graphene, Ni-G, films were electrodeposited on copper substrate by potentiostatic deposition. To achieve superhydrophobicity, myristic acid, MA, was used to modify the surface of the electrodeposited coatings. The manufactured Ni film modified with myristic acid, Ni-MA, and the Ni-G film modified with myristic acid, Ni-G-MA, show excellent superhydrophobic, SHP, properties with a water contact angle of 159° and 162°, respectively. The surface morphology of the prepared SHP films was investigated using a Scanning Electron Microscope, and the results revealed micro-nano structures in both Ni-MA and Ni-G-MA films. The Fourier Transform Infrared Spectrophotometer data showed that the Ni-MA and Ni-G-MA films were successfully grafted on the copper metal. The Ni-G-MA film possessed higher chemical stability and mechanical abrasion resistance than Ni-MA. The Ni-MA and Ni-G-MA films exhibit long-term durability in the outdoor environment for more than four months. The potentiodynamic polarization and electrochemical impedance spectroscopy results demonstrated that the SHP films on the copper substrate exhibit remarkable corrosion resistance in 0.5 M NaCl.
Collapse
Affiliation(s)
- D. M. Ragheb
- grid.7155.60000 0001 2260 6941Materials Science Department, Institute of Graduate Studies & Research, Alexandria University, Alexandria, Egypt
| | - A. M. Abdel-Gaber
- grid.7155.60000 0001 2260 6941Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt
| | - F. M. Mahgoub
- grid.7155.60000 0001 2260 6941Materials Science Department, Institute of Graduate Studies & Research, Alexandria University, Alexandria, Egypt
| | - M. E. Mohamed
- grid.7155.60000 0001 2260 6941Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt
| |
Collapse
|
32
|
Heating influence on hierarchical structures fabricated by direct laser interference patterning. Sci Rep 2022; 12:17728. [PMID: 36273021 PMCID: PMC9588078 DOI: 10.1038/s41598-022-22368-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Accepted: 10/13/2022] [Indexed: 11/26/2022] Open
Abstract
The combination of direct laser interference patterning (DLIP) with laser-induced periodic surface structures (LIPSS) enables the fabrication of functional surfaces reported for a wide spectrum of materials. The process throughput is usually increased by applying higher average laser powers. However, this causes heat accumulation impacting the roughness and shape of produced surface patterns. Consequently, the effect of substrate temperature on the topography of fabricated features requires detailed investigations. In this study, steel surfaces were structured with line-like patterns by ps-DLIP at 532 nm. To investigate the influence of substrate temperature on the resulting topography, a heating plate was used to adjust the temperature. Heating to 250 \documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$$^{\circ }$$\end{document}∘C led to a significant reduction of the produced structure depths, from 2.33 to 1.06 µm. The reduction is associated with the appearance of a different LIPSS type, depending on the grain orientation of the substrates and laser-induced superficial oxidation. This study revealed a strong effect of substrate temperature, which is also to be expected when heat accumulation effects arise from processing surfaces at high average laser power.
Collapse
|
33
|
Syafiq A, Balakrishnan V, Rahim NA. Durable self-cleaning nano-titanium dioxide superhydrophilic coating with anti-fog property. PIGMENT & RESIN TECHNOLOGY 2022. [DOI: 10.1108/prt-06-2022-0080] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Abstract
Purpose
This paper aims to design the nano-titanium dioxide (TiO2) coating system which has superhydrophilic property, self-cleaning mechanism and antifog property as well as strong adhesion on glass substrate.
Design/methodology/approach
Two hydrophilic materials have been used such as TiO2 nanoparticles as fillers and hydrophilic copolymer, Pluronic F-127 by using simple sol–gel approach. The prepared solution was applied onto glass through dip- and spray-coating techniques and then left for drying at ambient temperature.
Findings
The nano-TiO2 superhydrophilic coating has achieved the water contact angle of 4.9° ± 0.5°. The superhydrophilic coating showed great self-cleaning effect against concentrated syrup and methylene blue where thin layer of water washes the dirt contaminants away. The nano-TiO2 coating exhibits great antifog performance that maintains high transparency of around 89% when the coated glass is placed above hot-fog vapor for 10 min. The fog droplets were condensed into water film which allowed the transmission of light through the glass. The strong adhesion of coated glass shows no total failure at scratch profile when impacted with scratch load of 500, 800 and 1,200 mN.
Research limitations/implications
Findings will be useful in the development of self-cleaning superhydrophilic coating that is applicable on building glass and photovoltaic panel.
Practical implications
The developed nano-TiO2 coating is developed by the combination of hydrophilic organic copolymer–inorganic TiO2 network to achieve great superhydrophilic property, optimum self-cleaning ability and supreme antifog performance.
Social implications
The findings will be useful for residents in building glass window where the application will reduce dust accumulation and keep the glass clean for longer period.
Originality/value
The synthesis of nano-TiO2 superhydrophilic coating which can be sprayed on large glass panel and cured at ambient temperature.
Collapse
|
34
|
Syafiq A, Rahim NA, Balakrishnan V, Pandey A. Development of self-cleaning polydimethylsiloxane/nano-calcium carbonate-titanium dioxide coating with fog-resistance response for building glass. PIGMENT & RESIN TECHNOLOGY 2022. [DOI: 10.1108/prt-04-2022-0058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Abstract
Purpose
This paper introduced the simple synthesis process of self-cleaning coating with fog-resistance property using hydrophobic polydimethylsiloxane (PDMS) polymer and nano-calcium carbonate (nano-CaCO3) and titanium dioxide (TiO2).
Design/methodology/approach
The synthesis method of PDMS/nano-CaCO3-TiO2 is based on sol-gel process. The crosslinking between PDMS and nanoparticles is driven by the covalent bond at temperature of 50°C. The 3-Aminopropyltriethoxysilane is used as binder for nanoparticles attachment in polymer matrix. Two fabrication methods are used, which are dip- and spray-coating methods.
Findings
The prepared coated glass fulfilled the requirement of standard self-cleaning and fog-resistance performance. For the self-cleaning test BS EN 1096-5:2016, the coated glasses exhibited the dust haze value around 20%–25% at tilt angle of 10°. For the antifog test, the coated glasses showed the fog haze value were below 2% and the gloss value were above 85%. The obtained results completely achieved the standard antifog value ASTM F659-06 protocol.
Research limitations/implications
Findings will provide an infrastructure support for the building glass to enhance building’s energy efficiency, cleaning performance and friendly environment.
Practical implications
This study proposed the simple synthesis method using hydrophobic polymer and nano-CaCO3 and nano-TiO2, which can achieve optimum self-cleaning property at low tilt angle and fog-resistance performance for building glass.
Social implications
The research findings have high potential for building company, cleaning building company and government sector. The proposed project capable to reduces the energy consumption about 20% per annum due to labor cost, time-consuming and safety during manual cleaning.
Originality/value
The novel method to develop self-cleaning coating with fog-resistance using simple synthesis process and fabrication method for building glass application.
Collapse
|
35
|
An H, Jia N, Wang S, Peng Z, Chen S. Enhanced self-cleaning performance of bio-inspired micropillar-arrayed surface by shear. BIOINSPIRATION & BIOMIMETICS 2022; 17:066005. [PMID: 35931044 DOI: 10.1088/1748-3190/ac877b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Accepted: 08/05/2022] [Indexed: 06/15/2023]
Abstract
Inspired by the sliding behavior of gecko feet during climbing, the contribution of the shear effect to the self-cleaning performance of a bio-inspired micropillar-arrayed surface is studied through a load-shear-pull contact process. It is found that self-cleaning efficiency can be enhanced significantly by shear. The efficiency also depends on microparticle size. For the case of relatively large and small microparticles, self-cleaning efficiency increases first and then almost keeps a constant with the increase of shear distance at different preloads. For medium microparticles, shear can effectively improve self-cleaning efficiency only when the preload is small. The mechanical mechanism under such enhancement is mainly due to the varying contact states between microparticles and micropillars with the shear distance. When the shear distance is large enough, the final self-cleaning efficiency is not sensitive to shear distance anymore because the contact state reaches dynamic equilibrium. Based on such a self-cleaning mechanism of large microparticles, a simple and effective manipulator that can efficiently transfer solid particles is further proposed.
Collapse
Affiliation(s)
- Huazhen An
- Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, People's Republic of China
- Beijing Key Laboratory of Lightweight Multi-Functional Composite Materials and Structures, Beijing Institute of Technology, Beijing 100081, People's Republic of China
| | - Ning Jia
- Department of Applied Mechanics, University of Science and Technology Beijing, Beijing 100083, People's Republic of China
| | - Shuai Wang
- College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029,People's Republic of China
| | - Zhilong Peng
- Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, People's Republic of China
- Beijing Key Laboratory of Lightweight Multi-Functional Composite Materials and Structures, Beijing Institute of Technology, Beijing 100081, People's Republic of China
| | - Shaohua Chen
- Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, People's Republic of China
- Beijing Key Laboratory of Lightweight Multi-Functional Composite Materials and Structures, Beijing Institute of Technology, Beijing 100081, People's Republic of China
| |
Collapse
|
36
|
Huang H, Huang C, Xu C, Liu R. Development and characterization of lotus-leaf-inspired bionic antibacterial adhesion film through beeswax. Food Packag Shelf Life 2022. [DOI: 10.1016/j.fpsl.2022.100906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
37
|
Chen C, Zhan H, Bai X, Yuan Z, Zhao L, Liu Y, Feng S. Bionic superhydrophobic surfaces based on topography of copper oxides. BIOSURFACE AND BIOTRIBOLOGY 2022. [DOI: 10.1049/bsb2.12045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Affiliation(s)
- Chen Chen
- Key Laboratory for Precision & Non‐traditional Machining Technology of Ministry of Education Dalian University of Technology Dalian China
| | - Haiyang Zhan
- Key Laboratory for Precision & Non‐traditional Machining Technology of Ministry of Education Dalian University of Technology Dalian China
| | - Xiangge Bai
- Key Laboratory for Precision & Non‐traditional Machining Technology of Ministry of Education Dalian University of Technology Dalian China
| | - Zichao Yuan
- Key Laboratory for Precision & Non‐traditional Machining Technology of Ministry of Education Dalian University of Technology Dalian China
| | - Lei Zhao
- Key Laboratory for Precision & Non‐traditional Machining Technology of Ministry of Education Dalian University of Technology Dalian China
| | - Yahua Liu
- Key Laboratory for Precision & Non‐traditional Machining Technology of Ministry of Education Dalian University of Technology Dalian China
| | - Shile Feng
- Key Laboratory for Precision & Non‐traditional Machining Technology of Ministry of Education Dalian University of Technology Dalian China
| |
Collapse
|
38
|
Metal deposition and shape reproduction at biological temperatures on cell-level samples. Sci Rep 2022; 12:13328. [PMID: 35922439 PMCID: PMC9349294 DOI: 10.1038/s41598-022-17562-9] [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: 05/12/2022] [Accepted: 07/27/2022] [Indexed: 11/17/2022] Open
Abstract
The use of metal deposition has been limited to a limited number of applicable samples due to the increased temperature caused by accelerated electron impact on the substrate surface. The surfaces of various biological samples have a nanoscale structure with specific properties, which have been simulated in numerous studies. However, no examples of nano/microscale reproductions of biological surface features have used moulds. In this study, a mould that imitates the surface shape of a cellular-level biological material was fabricated, for the first time, and the shape was successfully reproduced using the mould. Al thin films were deposited on bovine sperm using magnetron sputtering without thermal denaturation with a cathode operating at a biological temperature. It is difficult to deposit films used as metal coatings on pre-treated biological materials at temperatures below 40 °C during evaporation. The Al thin film was peeled off and used as a mould to reproduce the shape of the sperm with high accuracy using a polymer. The results of this study represent a major innovation in reproducible biomimetic moulding technology, demonstrating biological temperature sputtering. We expect our non-destructive metal deposition and metal nano-moulding methods for biological samples to be the basis for the effective utilization of various biological structures.
Collapse
|
39
|
Baldanov BB, Ranzhurov TV. Effect of Plasma Treatment on Surface Wettability of Wheat Seeds. HIGH ENERGY CHEMISTRY 2022. [DOI: 10.1134/s0018143922040038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
40
|
Nakhoul A, Rudenko A, Maurice C, Reynaud S, Garrelie F, Pigeon F, Colombier J. Boosted Spontaneous Formation of High-Aspect Ratio Nanopeaks on Ultrafast Laser-Irradiated Ni Surface. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2200761. [PMID: 35618474 PMCID: PMC9313481 DOI: 10.1002/advs.202200761] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Revised: 04/21/2022] [Indexed: 05/27/2023]
Abstract
The capacity to synthesize and design highly intricated nanoscale objects of different sizes, surfaces, and shapes dramatically conditions the development of multifunctional nanomaterials. Ultrafast laser technology holds great promise as a contactless process able to rationally and rapidly manufacture complex nanostructures bringing innovative surface functions. The most critical challenge in controlling the growth of laser-induced structures below the light diffraction limit is the absence of external order associated to the inherent local interaction due to the self-organizing nature of the phenomenon. Here high aspect-ratio nanopatterns driven by near-field surface coupling and architectured by timely-controlled polarization pulse shaping are reported. Electromagnetic coupled with hydrodynamic simulations reveal why this unique optical manipulation allows peaks generation by inhomogeneous local absorption sustained by nanoscale convection. The obtained high aspect-ratio surface nanotopography is expected to prevent bacterial proliferation, and have great potential for catalysis, vacuum to deep UV photonics and sensing.
Collapse
Affiliation(s)
- Anthony Nakhoul
- Univ LyonUJM‐Saint‐Etienne, CNRS, IOGS, Laboratoire Hubert Curien, UMR5516St‐Etienne42023France
- Univ LyonMines Saint‐Etienne, CNRS, Centre SMS, Laboratoire Georges Friedel, UMR5307St‐Etienne42023France
| | - Anton Rudenko
- Arizona Center for Mathematical Sciences and College of Optical SciencesUniversity of ArizonaTucsonAZ85721USA
| | - Claire Maurice
- Univ LyonMines Saint‐Etienne, CNRS, Centre SMS, Laboratoire Georges Friedel, UMR5307St‐Etienne42023France
| | - Stéphanie Reynaud
- Univ LyonUJM‐Saint‐Etienne, CNRS, IOGS, Laboratoire Hubert Curien, UMR5516St‐Etienne42023France
| | - Florence Garrelie
- Univ LyonUJM‐Saint‐Etienne, CNRS, IOGS, Laboratoire Hubert Curien, UMR5516St‐Etienne42023France
| | - Florent Pigeon
- Univ LyonUJM‐Saint‐Etienne, CNRS, IOGS, Laboratoire Hubert Curien, UMR5516St‐Etienne42023France
| | - Jean‐Philippe Colombier
- Univ LyonUJM‐Saint‐Etienne, CNRS, IOGS, Laboratoire Hubert Curien, UMR5516St‐Etienne42023France
| |
Collapse
|
41
|
Luthfikasari R, Patil TV, Patel DK, Dutta SD, Ganguly K, Espinal MM, Lim KT. Plant-Actuated Micro-Nanorobotics Platforms: Structural Designs, Functional Prospects, and Biomedical Applications. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2201417. [PMID: 35801427 DOI: 10.1002/smll.202201417] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Revised: 06/14/2022] [Indexed: 06/15/2023]
Abstract
Plants are anatomically and physiologically different from humans and animals; however, there are several possibilities to utilize the unique structures and physiological systems of plants and adapt them to new emerging technologies through a strategic biomimetic approach. Moreover, plants provide safe and sustainable results that can potentially solve the problem of mass-producing practical materials with hazardous and toxic side effects, particularly in the biomedical field, which requires high biocompatibility. In this review, it is investigated how micro-nanostructures available in plants (e.g., nanoparticles, nanofibers and their composites, nanoporous materials, and natural micromotors) are adapted and utilized in the design of suitable materials for a micro-nanorobot platform. How plants' work on micro- and nanoscale systems (e.g., surface roughness, osmotically induced movements such as nastic and tropic, and energy conversion and harvesting) that are unique to plants, can provide functionality on the platform and become further prospective resources are examined. Furthermore, implementation across organisms and fields, which is promising for future practical applications of the plant-actuated micro-nanorobot platform, especially on biomedical applications, is discussed. Finally, the challenges following its implementation in the micro-nanorobot platform are also presented to provide advanced adaptation in the future.
Collapse
Affiliation(s)
- Rachmi Luthfikasari
- Department of Biosystems Engineering, Kangwon National University, Chuncheon, 24341, Republic of Korea
| | - Tejal V Patil
- Department of Biosystems Engineering, Kangwon National University, Chuncheon, 24341, Republic of Korea
- Interdisiplinary Program in Smart Agriculture, Kangwon National University, Chuncheon, 24341, Republic of Korea
| | - Dinesh K Patel
- Institute of Forest Science, Kangwon National University, Chuncheon, 24341, Republic of Korea
| | - Sayan Deb Dutta
- Department of Biosystems Engineering, Kangwon National University, Chuncheon, 24341, Republic of Korea
| | - Keya Ganguly
- Department of Biosystems Engineering, Kangwon National University, Chuncheon, 24341, Republic of Korea
| | - Maria Mercedes Espinal
- Department of Biosystems Engineering, Kangwon National University, Chuncheon, 24341, Republic of Korea
| | - Ki-Taek Lim
- Department of Biosystems Engineering, Kangwon National University, Chuncheon, 24341, Republic of Korea
- Interdisiplinary Program in Smart Agriculture, Kangwon National University, Chuncheon, 24341, Republic of Korea
- Institute of Forest Science, Kangwon National University, Chuncheon, 24341, Republic of Korea
| |
Collapse
|
42
|
Replica of Bionic Nepenthes Peristome-like and Anti-Fouling Structures for Self-Driving Water and Raman-Enhancing Detection. Polymers (Basel) 2022; 14:polym14122465. [PMID: 35746042 PMCID: PMC9231346 DOI: 10.3390/polym14122465] [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: 05/09/2022] [Revised: 06/14/2022] [Accepted: 06/15/2022] [Indexed: 11/25/2022] Open
Abstract
The flexible, anti-fouling, and bionic surface-enhanced Raman scattering (SERS) biochip, which has a Nepenthes peristome-like structure, was fabricated by photolithography, replicated technology, and thermal evaporation. The pattern of the bionic Nepenthes peristome-like structure was fabricated by two layers of photolithography with SU-8 photoresist. The bionic structure was then replicated by polydimethylsiloxane (PDMS) and grafting the zwitterion polymers (2-methacryloyloxyethyl phosphorylcholine, MPC) by atmospheric plasma polymerization (PDMS-PMPC). The phospholipid monomer of MPC immobilization plays an important role; it can not only improve hydrophilicity, anti-fouling and anti-bacterial properties, and biocompatibility, but it also allows for self-driving and unidirectional water delivery. Ag nanofilms (5 nm) were deposited on a PDMS (PDMS-Ag) substrate by thermal evaporation for SERS detection. Characterizations of the bionic SERS chips were measured by a scanning electron microscope (SEM), optical microscope (OM), X-ray photoelectron spectrometer (XPS), Fourier-transform infrared spectroscopy (FTIR), and contact angle (CA) testing. The results show that the superior anti-fouling capability of proteins and bacteria (E. coli) was found on the PDMS-PMPC substrate. Furthermore, the one-way liquid transfer capability of the bionic SERS chip was successfully demonstrated, which provides for the ability to separate samples during the flow channel, and which was detected by Raman spectroscopy. The SERS intensity (adenine, 10−4 M) of PDMS-Ag with a bionic structure is ~4 times higher than PDMS-Ag without a bionic structure, due to the multi-reflection of the 3D bionic structure. The high-sensitivity bionic SERS substrate, with its self-driving water capability, has potential for biomolecule separation and detection.
Collapse
|
43
|
Do VT, Tran NG, Chun DM. Fabrication of robust superhydrophobic micro-nano hierarchical surface structure using compression molding with carbon soot nanoparticles and thermoplastic polymer. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.124893] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
44
|
Role of Surface Topography in the Superhydrophobic Effect-Experimental and Numerical Studies. MATERIALS 2022; 15:ma15093112. [PMID: 35591445 PMCID: PMC9104868 DOI: 10.3390/ma15093112] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Revised: 04/12/2022] [Accepted: 04/14/2022] [Indexed: 01/14/2023]
Abstract
Within these studies, the effect of surface topography for hydrophobic coatings was studied both numerically and experimentally. Chemically modified polyurethane coating was patterned by application of a laser beam. A set of patterns with variously distant linear peaks and grooves was obtained. The cross section of the pattern showed that the edges of the peaks and grooves were not sharp, instead forming a rounded, rectangle-like shape. For such surfaces, experimental studies were performed, and in particular the static contact angle (SCA), contact angle hysteresis (CAH), and roll-off angle (ROA) were measured. Profilometry was used to create a numerical representation of the surface. Finite volume method was then applied to simulate the behavior of the water droplets. The model developed herewith enabled us to reproduce the experimental results with good accuracy. Based on the verified model, the calculation was extended to study the behavior of the water droplet on the simulated patterns, both spiked and rectangular. These two cases, despite a similar SCA of the water droplet, have shown extremely different ROA. Thus, more detailed studies were dedicated to other geometrical features of such topography, such as the size and distance of the surface elements. Based on the results obtained herewith, the future design of superhydrophobic and/or icephobic topography is discussed.
Collapse
|
45
|
Arango-Santander S. Bioinspired Topographic Surface Modification of Biomaterials. MATERIALS (BASEL, SWITZERLAND) 2022; 15:2383. [PMID: 35407716 PMCID: PMC8999667 DOI: 10.3390/ma15072383] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Revised: 03/11/2022] [Accepted: 03/16/2022] [Indexed: 12/17/2022]
Abstract
Physical surface modification is an approach that has been investigated over the last decade to reduce bacterial adhesion and improve cell attachment to biomaterials. Many techniques have been reported to modify surfaces, including the use of natural sources as inspiration to fabricate topographies on artificial surfaces. Biomimetics is a tool to take advantage of nature to solve human problems. Physical surface modification using animal and vegetal topographies as inspiration to reduce bacterial adhesion and improve cell attachment has been investigated in the last years, and the results have been very promising. However, just a few animal and plant surfaces have been used to modify the surface of biomaterials with these objectives, and only a small number of bacterial species and cell types have been tested. The purpose of this review is to present the most current results on topographic surface modification using animal and plant surfaces as inspiration to modify the surface of biomedical materials with the objective of reducing bacterial adhesion and improving cell behavior.
Collapse
|
46
|
Lotus-Leaf-Inspired Biomimetic Coatings: Different Types, Key Properties, and Applications in Infrastructures. INFRASTRUCTURES 2022. [DOI: 10.3390/infrastructures7040046] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
A universal infrastructural issue is wetting of surfaces; millions of dollars are invested annually for rehabilitation and maintenance of infrastructures including roadways and buildings to fix the damages caused by moisture and frost. The biomimicry of the lotus leaf can provide superhydrophobic surfaces that can repel water droplets, thus reducing the penetration of moisture, which is linked with many deterioration mechanisms in infrastructures, such as steel corrosion, sulfate attack, alkali-aggregate reactions, and freezing and thawing. In cold-region countries, the extent of frost damage due to freezing of moisture in many components of infrastructures will be decreased significantly if water penetration can be minimized. Consequently, it will greatly reduce the maintenance and rehabilitation costs of infrastructures. The present study was conducted to explore any attempted biomimicry of the lotus leaf to produce biomimetic coatings. It focuses on anti-wetting characteristics (e.g., superhydrophobicity, sliding angle, contact angle), self-cleaning capability, durability, and some special properties (e.g., light absorbance and transmission, anti-icing capacity, anti-fouling ability) of lotus-leaf-inspired biomimetic coatings. This study also highlights the potential applications of such coatings, particularly in infrastructures. The most abundant research across coating materials showed superhydrophobicity as being well-tested while self-cleaning capacity and durability remain among the properties that require further research with existing promise. In addition, the special properties of many coating materials should be validated before practical applications.
Collapse
|
47
|
Zhan F, Gao W, Zhao F, Qin P, Sun X, Sun C, Tang S, Wang L. Design of a flexible surface/interlayer for packaging. SOFT MATTER 2022; 18:2123-2128. [PMID: 35225321 DOI: 10.1039/d1sm01799c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Impact resistance and thermal insulation are important factors to be considered in the fields of encapsulation and drug transportation. In this study, a classic circular sleeve structure is designed by integrating the multi-level surface topography of the sleeve and a hollow sandwich in the wall, which effectively improves the energy absorption efficiency and thermal insulation effect. With the increase of the levels of surface structure, the stiffness of the whole structure and the stress on the topmost structure decreases, which is conducive to protecting the structure. In addition, the thermal conduction efficiency can be limited and the heat preservation ability would be improved as the reduction of the contacting area of packages with internal objects is attributed to such specific topography. Moreover, the synergistic effect of the hollow sandwich further enhances the advantages of mechanics and heat insulation. Based on the findings of this study, this novel design has potential applications in fields such as thermal insulation, packaging, and pharmaceuticals.
Collapse
Affiliation(s)
- Fei Zhan
- Third Orthopedics Department, Baoding No. 1 Central Hospital, Hebei 071000, China.
- School of Electrical and Electronic Engineering, Shijiazhuang Tiedao University, Hebei 050043, China
| | - Weina Gao
- Third Orthopedics Department, Baoding No. 1 Central Hospital, Hebei 071000, China.
| | - Feng Zhao
- Specialized Robot Engineering and Technological Centre of Hainan Province, Hainan Vocational University of Science and Technology, Haikou 571126, China
| | - Peng Qin
- Beijing Key Lab of Cryo-Biomedical Engineering and Key Lab of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.
| | - Xinlong Sun
- School of Textile Science and Engineering, Xi'an Polytechnic University, Xi'an, Shaanxi, 710048, China
| | - Chenkun Sun
- Beijing Key Lab of Cryo-Biomedical Engineering and Key Lab of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.
| | - Shousheng Tang
- Beijing Key Lab of Cryo-Biomedical Engineering and Key Lab of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.
| | - Lei Wang
- Beijing Key Lab of Cryo-Biomedical Engineering and Key Lab of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.
| |
Collapse
|
48
|
Erdem T, O’Neill T, Zupkauskas M, Caciagli A, Xu P, Lan Y, Bösecke P, Eiser E. Transparent Colloidal Crystals With Structural Colours. FRONTIERS IN PHYSICS 2022; 10. [DOI: 10.3389/fphy.2022.847142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Abstract
Spatially ordered arrangements of spherical colloids are known to exhibit structural colours. The intensity and brilliance of these structural colours typically improve with colloidal monodispersity, low concentrations of point and line defects and with increasing refractive index contrast between the colloids and the embedding medium. Here we show that suspensions of charge stabilised, fluorinated latex particles with low refractive-index contrast to their aqueous background form Wigner crystals with FCC symmetry for volume fractions between 13 and 40%. In reflection they exhibit both strong, almost angle-independent structural colours and sharp, more brilliant Bragg peaks despite the particle polydispersity and bimodal distribution. Simultaneously, these suspensions appear transparent in transmission. Furthermore, binary AB, A2B and A13B type mixtures of these fluorinated and similarly sized polystyrene particles appeared predominantly white but with clear Bragg peaks indicating a CsCl-like BCC structure and more complex crystals. We characterised the suspensions using a combination of reflectivity measurements and small-angle x-ray scattering, complemented by reflectivity modelling.
Collapse
|
49
|
Investigation of the Drag-Reduction Phenomenon on Plasma-Modified Surface. Symmetry (Basel) 2022. [DOI: 10.3390/sym14030524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Drag is one of the main energy-dissipating phenomena in engineering applications. Drag-reduction mechanisms have been studied to reduce this cost. Superhydrophobic surfaces (SHS) have high water repellency and have been studied as an alternative mechanism for reducing drag. The high level of repellency is due to the hierarchical structures in the micro- and nano-scales, making these surfaces able to trap air layers that impose the condition of slipping. The present work investigated the phenomenon of drag reduction on surfaces made of Sylgard® 184 elastomer and modified by low-pressure plasma treatments. Atmospheres with 40% Argon and 60% Acetylene, and 20% Argon and 80% Acetylene were used, varying the treatment times from 10 to 15 min of exposure to Acetylene. The surface, morphological and chemical modifications were confirmed by XPS and AFM analyses, showing the impression of a rough structure on the nanometric scale with deposition of chemical elements from the gas plasma. Furthermore, the obtained SHS showed lower resistance to flow, tested by the imposition of flow in channels.
Collapse
|
50
|
Chaffart D, Shi S, Ma C, Lv C, Ricardez-Sandoval LA. A Moving Front Kinetic Monte Carlo Algorithm for Moving Interface Systems. J Phys Chem B 2022; 126:2040-2059. [PMID: 35196012 DOI: 10.1021/acs.jpcb.1c10389] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
This work presents the development of a new kinetic Monte Carlo algorithm, referred to as Moving Front kinetic Monte Carlo (MFkMC), for simulating processes subject to moving interfaces. This framework is designed to capture the movement of transiently varying interfaces in a kinetic-like manner so that its movement can be described using Monte Carlo sampling. The MFkMC algorithm accomplishes this task by evaluating the behavior of the interfacial molecules and assigning kinetic Monte Carlo-style rate equations that describe the transition probability that a molecule would advance into the neighboring phase, displacing an interfacial molecule from the opposing phase and thus changing the interface. Due to its kinetic Monte Carlo structure, the MFkMC algorithm can additionally account for other important interfacial phenomena, such as interfacial surface reactions. The proposed algorithm was tested via applications to three different simple interfacial case studies. These studies validate the MFkMC algorithm and demonstrate its capabilities to accurately and efficiently simulate a variety of different moving interface systems.
Collapse
Affiliation(s)
- Donovan Chaffart
- Department of Chemical Engineering, University of Waterloo, Waterloo N2L 3G1, Canada
| | - Songlin Shi
- Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China
| | - Chen Ma
- Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China
| | - Cunjing Lv
- Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China
| | | |
Collapse
|