scholarly journals Osteoinduction Evaluation of Fluorinated Hydroxyapatite and Tantalum Composite Coatings on Magnesium Alloys

2021 ◽  
Vol 9 ◽  
Author(s):  
Zheng Cao ◽  
Li Li ◽  
Linjun Yang ◽  
LiLi Yao ◽  
Haiyan Wang ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Composite Coatings ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Implant Design ◽  
Water Contact ◽  
Thermal Synthesis ◽  
X Ray ◽  
Wide Range ◽  
Novel Strategy

Magnesium (Mg) alloys have a wide range of biomaterial applications, but their lack of biocompatibility and osteoinduction property impedes osteointegration. In order to enhance the bioactivity of Mg alloy, a composite coating of fluorinated hydroxyapatite (FHA) and tantalum (Ta) was first developed on the surface of the alloy through thermal synthesis and magnetron sputtering technologies in this study. The samples were characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), energy dispersive spectroscopy (EDS) mapping, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and water contact angle measurement (WCA), which characterized the surface alternation and confirmed the deposition of the target FHA/Ta coating. The results of cell morphology showed that the MC3T3-E1 cells on the surface of Mg/FHA/Ta samples had the largest spreading area and lamellipodia. Moreover, the FHA coating endowed the surface with superior cell viability and osteogenic properties, while Ta coating played a more important role in osteogenic differentiation. Therefore, the combination of FHA and Ta coatings could synergistically promote biological functions, thus providing a novel strategy for implant design.

Effect of Plasma-Induced Polymerization on Contact Angle of Paper

2011 ◽  
Vol 396-398 ◽  
pp. 1619-1623
Author(s):  
Zhao Ping Song ◽  
Jun Rong Li ◽  
Hui Ning Xiao
Keyword(s):  
Contact Angle ◽  
Photoelectron Spectroscopy ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Polymer Grafting ◽  
Hydrophobic Property ◽  
Cellulose Fibres ◽  
Water Contact ◽  
X Ray ◽  
Factors Associated

Hydrophobic modification of cellulose fibres was conducted by plasma-induced polymer grafting in an attempt to increase the hydrophobicity of paper. Two hydrophobic monomers, i.e., butyl acrylate (BA) and 2-ethylhexyl acrylate (2-EHA) were grafted on cellulose fibres, induced by atmospheric cold plasma. Various influencing factors associated with the plasma-induced grafting were investigated, including the contact time and reaction temperature with monomers, and the dosage of monomers. Contact-angle measurement, infrared spectrum (IR), X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM) were used to ascertain the occurrence of the grafting. The results showed that the hydrophobic property of the modified paper sheet was improved significantly after the plasma-induced grafting. The water contact angle on the surface of the paper reached up to higher than125°.

scholarly journals The Preparation and Properties of Multilayer Cu-MTa2O5 Composite Coatings on Ti6Al4V for Biomedical Applications

Nanomaterials ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1498 ◽  
Author(s):  
Zeliang Ding ◽  
Yi Wang ◽  
Quan Zhou ◽  
Ziyu Ding ◽  
Yiyong Wu ◽  
...  
Keyword(s):  
Adhesion Strength ◽  
Photoelectron Spectroscopy ◽  
Composite Coatings ◽  
Antibacterial Properties ◽  
Corrosion Current ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
X Ray ◽  
Force Microscopy ◽  
Antibacterial Performance

For the enhancement of the anticorrosion and antibacterial performance of the biomedical alloy Ti6Al4V, a novel Cu incorporated multilayer Ta2O5ceramic composite coating Cu-Ta2O5/Ta2O5/Ta2O5-TiO2/TiO2/Ti (coating codeCu-MTa2O5) was developed by radio frequency (RF) and direct current (DC) reactive magnetron sputtering. Meanwhile, to better display the multilayer Ta2O5 coating mentioned above, a monolayer Ta2O5 ceramic coating was deposited onto the surface of Ti6Al4V alloy as a reference. The surface morphology, microstructure, phase constituents, and elemental states of the coating were evaluated by atomic force microscopy, scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy, respectively. The adhesion strength, wettability, anticorrosion and antibacterial properties of the coating were examined by a scratch tester, contact angle measurement, electrochemical workstations, and plate counting method, respectively. The results showed that the deposited coatings were amorphous and hydrophobic. Cu doped into the Ta2O5 coating existed as CuO and Cu2O. A Ta2O5-TiO2/TiO2/Ti multi-interlayer massively enhanced the adhesion strength of the coating, which was 2.9 times stronger than that of the monolayer Ta2O5coating. The multilayer Cu-MTa2O5 coating revealed a higher corrosion potential and smaller corrosion current density as compared to the uncoated Ti6Al4V, indicating the better anticorrosion performance of Ti6Al4V. Moreover, a 99.8% antibacterial effect of Cu-MTa2O5 coated against Staphylococcus aureuswas obtained.

scholarly journals High Loading Capacity and Wear Resistance of Graphene Oxide/Organic Molecule Assembled Multilayer Film

2021 ◽  
Vol 9 ◽  
Author(s):  
Li Chen ◽  
Gang Wu ◽  
Yin Huang ◽  
Changning Bai ◽  
Yuanlie Yu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
Multilayer Films ◽  
Thickness Measurement ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Film Structure ◽  
Silicon Substrates ◽  
Water Contact ◽  
Macro Scale

Taking advantage of the strong charge interactions between negatively charged graphene oxide (GO) sheets and positively charged poly(diallyldimethylammonium chloride) (PDDA), self-assembled multilayer films of (GO/PDDA)n were created on hydroxylated silicon substrates by alternating electrostatic adsorption of GO and PDDA. The formation and structure of the films were analyzed by means of water contact angle measurement, thickness measurement, atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). Meanwhile, tribological behaviors in micro- and macro- scale were investigated by AFM and a ball-on-plate tribometer, respectively. The results showed that (GO/PDDA)n multilayer films exhibited excellent friction-reducing and anti-wear abilities in both micro- and macro-scale, which was ascribed to the special structure in (GO/PDDA)n multilayer films, namely, a well-stacked GO–GO layered structure and an elastic 3D crystal stack in whole. Such a film structure is suitable for design molecular lubricants for MEMS and other microdevices.

Bio-Inspired In Situ Fabrication of 11-Mercaptoundecanoic Acid Coating on Stainless Steel 304 for Corrosion Protection

2018 ◽  
Vol 913 ◽  
pp. 375-383
Author(s):  
Shuo Tian Sun ◽  
Yan Hua Lei ◽  
Tao Liu ◽  
Run Hua Fan ◽  
Shi Bin Sun
Keyword(s):  
Corrosion Protection ◽  
Photoelectron Spectroscopy ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Film Structure ◽  
Covalent Attachment ◽  
Water Contact ◽  
In Situ Fabrication ◽  
Corrosion Resistance Property

Bio-inspired in situ fabrication of 11-Mercaptoundecanoic Acid was proposed to prepare self-assembled coating of alkanethiolates on SS304 alloy. In this method, the SS304 was coated with a reactive biopolymer – Polydopamine (PDA) by dispersing them in a dopamine solution and mildly stirring at room temperature with subsequent covalent attachment of 11-Mercaptoundecanoic Acid molecules through the interaction between thiol groups and Polydopamine. The formation and surface structure of the coating were characterized by water contact angle measurement, scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). The electronic properties of such obtained functional film were studied by potentiodynamic polarization curve and EIS in 3.5% NaCl solution. Corrosion protection efficiency near 99 % was evaluated, and the excellent corrosion resistance property could be ascribed to the compact film structure and good seawater stability for modified SS304 surface, especially in limiting the infiltration of Cl-.

East Asian Calligraphy Black Ink-Coated Paper as Flexible Conducting Electrode for Supercapacitor

2021 ◽  
Author(s):  
Ren-Jie Xie ◽  
I-Chun Cheng ◽  
Jian-Zhang Chen
Keyword(s):  
Flexible Electronics ◽  
Photoelectron Spectroscopy ◽  
Low Cost ◽  
East Asian ◽  
Electrical Conductance ◽  
Angle Measurement ◽  
Bending Test ◽  
Coated Paper ◽  
Water Contact ◽  
X Ray

Abstract East Asian calligraphy black ink (hereafter called simply “black ink”) is used to fabricate flexible conducting chromatography paper electrode by a simple and low-cost method. The black ink-coated paper was characterized by scanning electron microscopy, surface profiler, water contact angle measurement, electrical resistance measurement, X-ray photoelectron spectroscopy, and X-ray diffraction. The hydrophilicity slightly decreased after black ink coating but still provided good adhesion to the follow-up reduced graphene oxide/polyaniline/chitosan slurry coating for fabricating supercapacitor electrodes. A 1000-cycle repeated bending test with a bending radius of 5 mm revealed good conductance retention. Instrumental analyses indicated that the carbon black in the black ink was the main contributor to the electrical conductance. The supercapacitor with black-ink-coated paper electrodes exhibited an areal specific capacitance of up to 179.08 mF/cm² and coulomb efficiency of 80%. This confirmed that the black-ink-coated paper electrode could be feasibly applied to a supercapacitor. This black-ink-coated paper can be easily fabricated in resource-limited settings, and it provides new possibilities for the use of paper-based electrodes in flexible electronics.

Superhydrophobic Coatings Prepared by Micro/nano Particles Mixed with Fluorocarbon Resin

2011 ◽  
Vol 687 ◽  
pp. 552-556
Author(s):  
Yu Hong Qi ◽  
Zhan Ping Zhang ◽  
Jing Zhao Wang ◽  
Ya Meng Chen
Keyword(s):  
Contact Angle ◽  
Electrochemical Impedance ◽  
Composite Coatings ◽  
Single Layer ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Nano Particles ◽  
Mass Ratio ◽  
Water Contact ◽  
Marine Corrosion

In this paper, single and multilayer superhydrophobic composite coatings, based on fluorocarbon resin and micro-tourmaline and nano-TiO2powers, were prepared by conventional air spray method. The tourmaline and TiO2particles were modified by fluoroalkylsilane. The wettability and marine corrosion of the coatings surfaces were investigated respectively by contact angle measurement and Electrochemical Impedance Spectroscopy (EIS) method, and their morphology was examined by Scanning Electron Microscopy (SEM). The results showed that the water contact angle of coatings was mainly controlled by the mass ratio of the fluorocarbon resin and particles. The contact angle increased with the increase of particle concentration, which reached about 156° when the mass ratio of the particles and fluorocarbon resin was 2:1 for single and multilayer composite coatings, but the impedance valve of the multilayer is higher than that of the single layer.

Fabrication of superhydrophobic cotton fabrics through wrapping silica with plasma-induced grafting polymerization

2017 ◽  
Vol 89 (3) ◽  
pp. 401-410 ◽  
Author(s):  
Yongqiang Li ◽  
Chao Zou ◽  
Jianzhong Shao ◽  
Ya’nan Li
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Cotton Fabric ◽  
Photoelectron Spectroscopy ◽  
Contact Angle Measurement ◽  
Cotton Fabrics ◽  
Angle Measurement ◽  
Water Contact ◽  
Washing Durability ◽  
Before And After

Cotton fabric is commonly used in daily life, but it is easily wetted and contaminated by liquid. Herein, we present a simple and environmentally friendly plasma technology for hydrophobic modification of cotton fabric. In order to endow superhydrophobicity to cotton fabric, helium plasma inducing graft polymerization of 1,3,5,7-tetravinyl-1,3,5,7-tetramethylcyclotetrasiloxane (D4Vi) was utilized to wrap SiO2 particles on cotton fabrics. Cotton fabrics were successively dipped in silica sol and D4Vi, then treated by plasma. Cotton fabrics before and after modification were characterized by using field emission scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and water contact angle measurement. The experimental results showed that the cotton-SiO2-D4Vi consisted of nanoscale SiO2 protrusions and low-surface-energy film polymerized by D4Vi. In addition, the one wrapped SiO2 of 161 nm presented excellent hydrophobicity, washing durability, and repellency toward different types of liquids with a water contact angle of 152°.

scholarly journals Fabrication and characterization of superhydrophobic and superlipophilic silica nanofibers mats with excellent heat resistance

2016 ◽  
Vol 52 (1) ◽  
pp. 87-92 ◽  
Author(s):  
S. Gao ◽  
H. Watanabe ◽  
K. Nakane ◽  
K. Zhao
Keyword(s):  
Contact Angle ◽  
Heat Resistance ◽  
Photoelectron Spectroscopy ◽  
Treatment Time ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
High Specific Surface Area ◽  
Water Contact ◽  
Water Filter ◽  
Silica Nanofibers

A kind of silica nanofibers (SNF) mats with superhydrophobicity and superlipophilicity as well as excellent heat resistance, had been prepared by modifying of 1, 1, 1, 3, 3, 3-hexamethyldisilazane on electrospun SNF mats. The effects of heat treatment time on properties of modified SNF mats were investigated by scanning electron microscopy, nitrogen absorption analysis, X-ray photoelectron spectroscopy, and contact angle measurement. With high specific surface area 240.1 m2/g, the optimal modified SNF mat approached water contact angle (WCA) 153.2? and fuel contact angle (FCA) 0?, furthermore, even after annealing by 450?C in air for 1h , WCA remained at 135.5? and FCA kept at 3.8?, which opened a new way to improve heat resistance of fuel-water filter paper.

Adsorption of Hyperbranched Polysiloxysilane Modified with Triethoxy Group onto the Silicon Wafer

2007 ◽  
Vol 19 (5-6) ◽  
pp. 700-710 ◽  
Author(s):  
Yasuko Yamada ◽  
Tomoyasu Hirai ◽  
Ryohei Kikuchi ◽  
Teruaki Hayakawa ◽  
Masa-Aki Kakimoto
Keyword(s):  
Contact Angle ◽  
Silicon Wafer ◽  
Photoelectron Spectroscopy ◽  
Dynamic Contact Angle ◽  
Dynamic Contact ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Wafer Surface ◽  
Water Contact ◽  
Silicon Wafer Surface

Triethoxysilyl functionalized hyperbranched polsiloxysilanes at the focal (FT-HBPSs) and terminal (TT-HBPSs) positions were synthesized to investigate adsorption behavior onto a silicon wafer surface. The surface of the silicon wafer adsorbed with the HBPSs was characterized by X-ray photoelectron spectroscopy, atomic force microscopy (AFM), static and dynamic water contact angle measurements. The AFM images indicated the formation size of dot-like structures were approximately 200 nm. The presence of vinyl terminal groups of FT-HBPSs permitted conversion of the surface from a non-polar hydrocarbon to a polar hydroxylated or carboxylated structures. After the polarity was changed, the surface properties were also studied using the above surface analysis techniques. The dynamic contact angle measurement indicated that the silicon wafer surface modified by FT-HBPSs was more hydrophilic in water than TT-HBPS. This behavior can be explained by the difference of connecting points between HBPS and the silicon wafer surface.

scholarly journals Activation of Sphalerite by Ammoniacal Copper Solution in Froth Flotation

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Xian Xie ◽  
Kai Hou ◽  
Bo Yang ◽  
Xiong Tong
Keyword(s):  
Photoelectron Spectroscopy ◽  
Copper Sulphate ◽  
Separation Efficiency ◽  
Froth Flotation ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Activation Effect ◽  
X Ray ◽  
Copper Solution ◽  
Measurement Results

The activation of sphalerite particles by ammoniacal copper solution (ACS) was investigated in this study. This microflotation study was conducted on a single sphalerite mineral with the particles size of 38 μm to 75 μm. Results showed that ACS has somewhat better activation effect than copper sulphate (a traditional activator) with sodium isobutyl xanthate as the collector. Agglomeration observation, contact angle measurement, and X-ray photoelectron spectroscopy measurement results of sphalerite particles verified the superiority of this new activator. Therefore, the substitution of copper sulphate with ACS would increase the separation efficiency not only in marmatite flotation but also in sphalerite flotation.

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