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Superhydrophobic Surface

Xiaoming Wang, Xingeng Li, Qingquan Lei, Yaping Wu, Wenjing Li
Composite superhydrophobic coating built with film former and filler is attracting much attention for its facile and convenient fabrication, but significant limitations and disadvantages still remain. In this paper, a composite superhydrophobic coating is introduced which can be cured at room temperature and made by dispersing modified silica nanoparticles with 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane in fluorosilicone resin. Silica content and dispersion time showed obvious influences on the morphology and topography of composite coating by reuniting dispersed nanoparticles to form peaks on the surface...
July 2018: Royal Society Open Science
Xiaolai Li, Yuliang Wang, Binglin Zeng, Yanshen Li, Huanshu Tan, Harold J W Zandvliet, Xuehua Zhang, Detlef Lohse
The formation and evolution of immersed surface micro- and nanobubbles are essential in various practical applications, such as the usage of superhydrophobic materials, drug delivery and mineral flotation. In this work, we investigate the entrapment of microbubbles on a hydrophobic surface, structured with microwells, when water flow passes along, and the subsequent microbubble dissolution. At entrapment, the microbubble is initially pinned at the edge of the microwell. At some point, the three phase contact line detaches from one side of the edge and separates from the wall, after which it is further receding...
August 13, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Ibrahim M Alarifi, Waseem S Khan, Ramazan Asmatulu
This study deals with the fabrication of polyacrylonitrile (PAN) nanofibers via an electrospinning process followed by stabilizing and carbonization in order to remove all non-carboneous matter and ensure a pure carboneous material. The as-spun PAN fibers were stabilized in air at 270°C for one hour and then carbonized at 750, 850, and 950°C in an inert atmosphere (argon) for another one hour. Differential scanning calorimetry and Raman spectroscopy were employed to determine the thermal and chemical properties of PAN...
2018: PloS One
Yingchao Dong, Lining Ma, Chuyang Y Tang, Fenglin Yang, Xie Quan, David Jassby, Michael J Zaworotko, Michael Dominic Guiver
Membrane distillation (MD) is a promising process for the treatment of highly saline wastewaters. The central component of MD is a stable porous hydrophobic membrane with a large liquid-vapor interface for efficient water vapor transport. A key challenge for current polymeric or hydrophobically modified inorganic membranes is insufficient operating stability, resulting in some issues such as wetting, fouling, flux and rejection decline. This study presents an overall conceptual design and application strategy for a superhydrophobic ceramic‒based carbon nanotube (CNT) desalination membrane having specially designed membrane structures with unprecedented operating stability and MD performance...
August 7, 2018: Nano Letters
Hanpeng Gao, Yan Liu, Shuyi Li, Guoyong Wang, Zhiwu Han, Luquan Ren
Recently, superhydrophobic surfaces with switchable wettability have attracted much attention. The ability to control the contact angle and adhesion of the multifunctional smart surface will be more beneficial to meet the complex practical applications, but until now this has been a challenge. Inspired by rose petals, we report a smart, biomimetic, and superhydrophobic surface whose wettability can switch reversibly between superhydrophobicity and superhydrophilicity on the Cu substance. At the same time, we can control the adhesion on the as-prepared superhydrophobic surface by covering and removing the ink...
August 7, 2018: Nanoscale
Binbin Zhang, Weichen Xu, Qingjun Zhu, Yantao Li, Baorong Hou
The potential marine corrosion-resistant and anti-biofouling applications of superhydrophobic materials arouse tremendous attention of researchers and engineers. Herein, we report an ultrafast (∼120 s) and eco-friendly one step electrodeposition strategy to construct fluorine-free superhydrophobic aluminum surface with outstanding water repellency and ultrahigh corrosion resistance to inhibit marine corrosion. As characterized through Field-emission scanning electron microscopy (FE-SEM), Atomic force microscopy (AFM), Energy dispersive spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS), the as-constructed non-fluorinated superhydrophobic surface is composed of manganese palmitate complex featuring with a typical dual-scale hierarchical papillae structures and low surface energy...
July 31, 2018: Journal of Colloid and Interface Science
Nandi Vrancken, Jiaqi Li, Stefanie Sergeant, Guy Vereecke, Geert Doumen, Frank Holsteyns, Chang Chen, Herman Terryn, Stefan De Gendt, XiuMei Xu
Superhydrophobic surfaces are highly promising for self-cleaning, anti-fouling and anti-corrosion applications. However, accurate assessment of the lifetime and sustainability of super-hydrophobic materials is hindered by the lack of large area characterization of superhydrophobic breakdown. In this work, attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR) is explored for a dynamic study of wetting transitions on immersed superhydrophobic arrays of silicon nanopillars. Spontaneous breakdown of the superhydrophobic state is triggered by in-situ modulation of the liquid surface tension...
August 2, 2018: Scientific Reports
Damon Aboud, Anne-Marie Kietzig
Oblique water drop impacts were performed on a superhydrophobic surface at normal Weber numbers in the range of 3 < We_n < 80 and at angles of incidence ranging from 0 < AOI < 60°. While holding We_n constant, we varied the AOI to investigate how the oblique nature of the impact affects the sliding length and spreading diameter of impacting drops. Our sliding length measurements indicate that drops impacting at We_n < 10 retain essentially full mobility on the surface, whereas the sliding of higher-We_n impacts is inhibited by drag forces...
July 31, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Hao Li, Tianyu Yan, Kristen A Fichthorn, Sirong Yu
In this work, we investigate the dynamic advancing and receding contact angles, and the mechanisms of motion of water droplets moving across nano-pillared superhydrophobic surfaces using molecular-dynamics simulation. We obtain equilibrium Cassie states of droplets on nano-pillared surfaces with different pillar heights, groove widths, and intrinsic contact angles. We quantitatively evaluate the dynamic advancing and receding contact angles along the advancing direction of an applied body force, and find that they depend on the roughness parameters and the applied body force in a predictable way...
July 30, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Kang Liu, Zhi Huang, Ali Hemmatifar, Diego I Oyarzun, Jun Zhou, Juan G Santiago
Efficient water removal from a cool surface during condensation is critically important to the enhancement of a variety of heat transfer applications. Previous work has focused on the fabrication of superhydrophobic surfaces which promote water droplets and removal via droplet shedding or jumping. Here, we report a novel strategy with a droplet self-cleaning surface which spontaneously transports all of the droplets from the condensation surface to the back side. We fabricate the self-cleaning surface by simply tailoring the wettability of the two sides of a porous membrane and demonstrate that the hydrophobic side is effective in clearing off droplets of a wide range of diameters...
July 30, 2018: ACS Applied Materials & Interfaces
Andreas Hirsch, Maria Eugenia Pérez-Ojeda, Isabell Wabra, Christoph Böttcher
Herein, we report the synthesis of fullerene derivatives with adjustable polarities and lyotropic aggregation properties. The polarity range spans from superhydrophobic to hydrophilic, while simultaneously providing a further reactive position with a view to grafting them onto other materials. The synthetic strategy relies on a selective protection with an isoxazoline moiety. The remaining octahedral positions were further functionalised with the desired groups to tune their solubility, yielding mixed [5:1] hexakisadducts...
July 30, 2018: Chemistry: a European Journal
Mohammad Yahya Baktash, Aida Asem Yousefi, Habib Bagheri
In this research, a new approach for extraction and determination of polycyclic aromatic hydrocarbons from sea and rain water samples was developed by implementing a superhydrophobic substrate and consuming the least amount of solvent. This version of solvent-supported microextraction enabled us to perform the procedure in the immersion mode with the slightest troubles arising from water leakage into the gas chromatography. The superhydrophobic property leads to the fixation of extracting solvent on the substrate surface during water sampling...
July 21, 2018: Ecotoxicology and Environmental Safety
Ni Wang, Yanbing Wang, Bin Shang, Peihua Wen, Bo Peng, Ziwei Deng
It is imperative to develop efficient and environmentally friendly oil-spill cleanup materials to solve the problems raised by frequent oil spillages and industrial discharge of organic solvents. Here, we present a bioinspired one-step construction of hierarchical superhydrophobic surfaces on various commercial porous materials by immersing the materials into an alkaline aqueous mixture consisting of dopamine (DA) and dodecyltrimethoxysilane (DTMS). The self-polymerization of DA constructs the bumpy surfaces, while the DTMS coatings enhance the hydrophobicity of the surfaces...
July 17, 2018: Journal of Colloid and Interface Science
Yubao Bi, Lei Han, Yangfan Zheng, Yunpeng Guan, Haijun Zhang, Shengtao Ge, Huifang Wang, Quanli Jia, Yuxin Zhang, Shaowei Zhang
Hydrophobic and oleophilic sorbents play an important role in the remediation processes of oil spills/leakages occurring globally from time to time. In this work, for the first time, lotus-seedpod-bioinspired 3D superhydrophobic diatomite porous ceramics with good mechanical strength and thermal stability were fabricated, using inexpensive porous diatomite as a substrate, and graphene/carbon nanobelts as modifiers. Thanks to the presence of graphene coating and in situ formed carbon nanobelts, the surface energy of the final porous ceramics was reduced and their surface roughness increased, conferring superhydrophobicity on them...
August 3, 2018: ACS Applied Materials & Interfaces
Tingting Ren, Mingqing Yang, Kaikai Wang, Yue Zhang, Junhui He
Human health and industrial instruments have been suffering from bacterial colonization on the surface of materials for a long time. Recently, antibacterial coatings are regarded as the new strategy to resist bacterial pathogens. In this work, novel highly transparent and superhydrophobic coatings with extremely low bacterial adhesion and bactericidal performance were prepared by spray-coating hydrophobic silica sol and CuO nanoparticles. The coated glass showed high transmittance in 300-2500 nm with a maximum value of 96...
August 1, 2018: ACS Applied Materials & Interfaces
Gyoung Gug Jang, D Barton Smith, Frederick Alyious List, Dominc F Lee, Anton V Ievlev, Liam Collins, Jaehyeung Park, Georgios Polizos
The anti-soiling (AS) performance of solar mirrors coated with a highly transparent, superhydrophobic nanoparticle-textured coating has been characterized. The AS coatings were created on the mirror surface by depositing nano-textured silica nanoparticle layers of ∼250 nm thickness using a draw-down coating process, followed by fluorination of the nanoparticles in a molecular vapor deposition process. Highly uniform surface features of the AS-coated mirrors (20 × 30 cm2, no measurable loss in specular reflectance, and water contact angle >165°) provided an outstanding AS performance...
August 2, 2018: Nanoscale
Lei Li, Chao Wang, Lina Yang, Mengke Su, Fanfan Yu, Li Tian, Honglin Liu
Biofluid analysis by surface-enhanced Raman scattering (SERS) is usually hindered by nonspecific interferences. It is challenging to drive targeted molecules towards sensitive areas with specific capture and quantitative recognition in complex biofluids. Herein, a highly specific and quantitative SERS analyzer for small molecule dopamine (DA) in serum is demonstrated on a portable Raman device by virtue of a transducer of mercaptophenylboronic acid (MPBA) and a site-directed decoration of plasmonic Ag dendrites on a superhydrophobic surface...
August 7, 2018: Nanoscale
Jaesung Kim, Se Pyeong Im, Jung Seok Lee, Jassy Mary S Lazarte, Si Won Kim, Jae Wook Jung, Jong Yong Kim, Young Rim Kim, Sangmin Lee, Gwang Joong Kim, Hyun Suk Jung, Kyun Oh Lee, Alexandra Adams, Kim D Thompson, Tae Sung Jung
In hagfish and lampreys, two representative jawless vertebrates, the humoral immunity is directly mediated by variable lymphocyte receptors B (VLRBs). Both monomeric VLRBs are structurally and functionally similar, but their C-terminal tails differ: lamprey VLRB has a Cys-rich tail that forms disulfide-linked pentamers of dimers, contributing to its multivalency, whereas hagfish VLRB has a superhydrophobic tail of unknown structure. Here, we reveal that VLRBs obtained from hagfish plasma have a globular-shaped multimerized form (approximately 0...
July 17, 2018: Scientific Reports
Maiping Yang, Weiqu Liu, Chi Jiang, Sha He, Yankun Xie, Zhengfang Wang
The purpose of this paper is to propose a facile, green and low-cost approach of the preparation of superhydrophobic cotton textiles, which can be fabricated with fluorinated TiO2 sols via a sol-gel method. The coating was prepared with TiO2 sols catalyzed with acetic acid, then modified by poly(Hexafluorobutyl methacrylate) (PHFBMA) which was synthesized by free radical polymerization. The wettability, surface morphology and chemical composition of pristine and modified cotton fabrics were investigated. The modified fabric presents a high contact angle reached up to 152...
October 1, 2018: Carbohydrate Polymers
Christopher Walker, Sebastian Lerch, Matthias Reininger, Hadi Eghlidi, Athanasios Milionis, Thomas M Schutzius, Dimos Poulikakos
Ice nucleation from vapor presents a variety of challenges across a wide range of industries and applications including refrigeration, transportation, and energy generation. However, a rational comprehensive approach to fabricating intrinsically icephobic surfaces for frost formation-both from water condensation (followed by freezing) and in particular from desublimation (direct growth of ice crystals from vapor)-remains elusive. Here, guided by nucleation physics, we investigate the effect of material composition and surface texturing (atomically smooth to nanorough) on the nucleation and growth mechanism of frost for a range of conditions within the sublimation domain (0 °C to -55 °C; partial water vapor pressures 6 to 0...
July 18, 2018: ACS Nano
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