The Experts below are selected from a list of 229290 Experts worldwide ranked by ideXlab platform
Sp P Ng - One of the best experts on this subject based on the ideXlab platform.
-
Surface modification of polyester synthetic leather with tetramethylsilane by atmospheric pressure plasma
Applied Surface Science, 2015Co-Authors: C H Kwong, Sp P NgAbstract:Abstract Much works have been done on synthetic materials but scarcely on synthetic leather owing to its Surface structures in terms of porosity and roughness. This paper examines the use of atmospheric pressure plasma (APP) treatment for improving the Surface performance of polyester synthetic leather by use of a precursor, tetramethylsilane (TMS). Plasma deposition is regarded as an effective, simple and single-step method with low pollution. Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR) confirm the deposition of organosilanes on the sample's Surface. The results showed that under a particular combination of treatment parameters, a Hydrophobic Surface was achieved on the APP treated sample with sessile drop static contact angle of 138°. The Hydrophobic Surface is stable without hydrophilic recovery 30 days after plasma treatment.
Paul Fente - One of the best experts on this subject based on the ideXlab platform.
-
how water meets a Hydrophobic Surface
Physical Review Letters, 2006Co-Authors: Adele Poyno, Liang Hong, I K Robinso, Steve Granick, Zha Zhang, Paul FenteAbstract:Synchrotron x-ray reflectivity measurements of the interface between water and methyl-terminated octadecylsilane monolayers with stable contact angle $g100\ifmmode^\circ\else\textdegree\fi{}$ conclusively show a depletion layer, whether or not the water is degassed. The thickness is of order one water molecule: 2--4 \AA{} with electron density $l40%$ that of bulk water. Considerations of coherent and incoherent averaging of lateral inhomogeneities show that the data cannot be explained by ``nanobubbles.'' When the contact angle is lower, unstable in time, or when monolayers fail to be sufficiently smooth over the footprint of the x-ray beam, there is no recognizable depletion.
Evangelos Gogolides - One of the best experts on this subject based on the ideXlab platform.
-
Hydrophobic and superHydrophobic Surfaces fabricated using atmospheric pressure cold plasma technology a review
Advances in Colloid and Interface Science, 2018Co-Authors: P Dimitrakellis, Evangelos GogolidesAbstract:Abstract Hydrophobic Surfaces are often used to reduce wetting of Surfaces by water. In particular, superHydrophobic Surfaces are highly desired for several applications due to their exceptional properties such as self-cleaning, anti-icing, anti-friction and others. Such Surfaces can be prepared via numerous methods including plasma technology, a dry technique with low environmental impact. Atmospheric pressure plasma (APP) has recently attracted significant attention as lower-cost alternative to low-pressure plasmas, and as a candidate for continuous rather than batch processing. Although there are many reviews on water-repellent Surfaces, and a few reviews on APP technology, there are hardly any review works on APP processing for Hydrophobic and superhydrohobic Surface fabrication, a topic of high importance in nanotechnology and interface science. Herein, we critically review the advances on Hydrophobic and superHydrophobic Surface fabrication using APP technology, trying also to give some perspectives in the field. After a short introduction to superHydrophobicity of nanostructured Surfaces and to APPs we focus this review on three different aspects: (1) The atmospheric plasma reactor technology used for fabrication of (super)Hydrophobic Surfaces. (2) The APP process for Hydrophobic Surface preparation. The Hydrophobic Surface preparation processes are categorized methodologically as: a) activation, b) grafting, c) polymerization, d) roughening and hydrophobization. Each category includes subcategories related to different precursors used. (3) One of the most important sections of this review concerns superHydrophobic Surfaces fabricated using APP. These are methodologically characterized as follows: a) single step processes where micro-nano textured topography and low Surface energy coating are created at the same time, or b) multiple step processes, where these steps occur sequentially in or out of the plasma. We end the review with some perspectives in the field. We aspire to address scientists, who will get involved in the fields of (super)Hydrophobicity and/or in atmospheric pressure plasma processing.
Jingcheng Hao - One of the best experts on this subject based on the ideXlab platform.
-
facile fabrication of a robust super Hydrophobic Surface on magnesium alloy
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2014Co-Authors: Qingwei Chu, Ju Liang, Jingcheng HaoAbstract:Abstract A super-Hydrophobic Surface was successfully fabricated on magnesium alloy by electrodeposition of Zn–Co coating from choline chloride-based ionic liquid and subsequent Surface modification. The water contact angle (CA) was measured to be as high as 152. Based on Surface analysis by scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared (FTIR), the super-Hydrophobicity can be attributed to both the rough and porous micro- and nano-scale binary structural Zn–Co coating and Surface enrichment of low Surface energy stearic acid (SA). The corrosion behavior was investigated with potentiodynamic polarization measurements and it was found that the super-Hydrophobic coating considerably improved the corrosion resistant performance of magnesium alloy in 0.1 mol/L NaCl solution. In addition, the stability of the super-Hydrophobic property was investigated by immersion in aqueous solution, finger touching and abrasion with sandpaper. The results showed that the super-Hydrophobic coating exhibited high stability in aqueous solution, the rough Surface textures were retained and the coating still exhibited a large contact angle after mechanical destroy.
Jijia Zhang - One of the best experts on this subject based on the ideXlab platform.
-
a electro deposition process for fabrication of biomimetic super Hydrophobic Surface and its corrosion resistance on magnesium alloy
Electrochimica Acta, 2014Co-Authors: Jijia Zhang, Sirong YuAbstract:Abstract Super-Hydrophobic Surface has many special functions that are studied wildly. The ingenious microstructures of typical plant leaves with super-Hydrophobicity enlighten researchers to design and fabricate artificial super-Hydrophobic Surface. Being the lightest alloy among structural metals materials magnesium alloy was restricted due to its poor corrosion resistance. A super-Hydrophobic Surface with self-cleaning was successfully deposited on AZ91D magnesium alloy by the nickel plating process. The super-Hydrophobic Surfaces were covered with cauliflower-like cluster binary micro-nano structural Ni coatings. The procedure was that the samples were processed by plating after pretreatment, finally modified by stearic acid (CH 3 (CH 2 ) 16 COOH). The Surface morphologies, chemical composition, wettability and corrosion resistance are characterized by means of SEM, FT-IR, water contact angle and electrochemical impedance spectroscopy (EIS) measurements. The as-prepared super-Hydrophobic Surface has a contact angle as high as 160.8 ± 1° and a SA as low as 1.8 ± 1°, showing good long-term stability. The super-Hydrophobic Surface exhibited excellent corrosion resistance property in the 3.5 wt. % NaCl solution. This method could provide a straightforward and effective route to fabricate large-area super-Hydrophobic Surface with anticorrosion and self-cleaning for a great number of potential applications, and easily extended to other metal materials.
-
biomimetic Hydrophobic Surface fabricated by chemical etching method from hierarchically structured magnesium alloy substrate
Applied Surface Science, 2013Co-Authors: Ya Liu, Jijia Zhang, Yaming WangAbstract:Abstract As one of the lightest metal materials, magnesium alloy plays an important role in industry such as automobile, airplane and electronic product. However, magnesium alloy is hindered due to its high chemical activity and easily corroded. Here, inspired by typical plant Surfaces such as lotus leaves and petals of red rose with super-Hydrophobic character, the new Hydrophobic Surface is fabricated on magnesium alloy to improve anti-corrosion by two-step methodology. The procedure is that the samples are processed by laser first and then immersed and etched in the aqueous AgNO 3 solution concentrations of 0.1 mol/L, 0.3 mol/L and 0.5 mol/L for different times of 15 s, 40 s and 60 s, respectively, finally modified by DTS (CH 3 (CH 2 ) 11 Si(OCH 3 ) 3 ). The microstructure, chemical composition, wettability and anti-corrosion are characterized by means of SEM, XPS, water contact angle measurement and electrochemical method. The Hydrophobic Surfaces with microscale crater-like and nanoscale flower-like binary structure are obtained. The low-energy material is contained in Surface after DTS treatment. The contact angles could reach up to 138.4 ± 2°, which Hydrophobic property is both related to the micro–nano binary structure and chemical composition. The results of electrochemical measurements show that anti-corrosion property of magnesium alloy is improved. Furthermore, our research is expected to create some ideas from natural enlightenment to improve anti-corrosion property of magnesium alloy while this method can be easily extended to other metal materials.
