scholarly journals Effect of Structure, Composition, and Micromorphology on the Hydrophobic Property of F-DLC Film

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Aihua Jiang ◽  
Jianrong Xiao ◽  
Xinyu Li ◽  
Zhiyong Wang
Keyword(s):  
Surface Roughness ◽  
Contact Angle ◽  
Photoelectron Spectroscopy ◽  
Fluorine Content ◽  
Relative Content ◽  
Diamond Like Carbon ◽  
Hydrophobic Property ◽  
Dlc Film ◽  
Vapor Deposition Technique ◽  
Xps Characterization

Fluorinated diamond-like carbon (F-DLC) films were prepared by radio frequency plasma-enhanced chemical vapor deposition technique with CF4and CH4as source gases under different deposition conditions. The chemical bonding structure and composition of the films were detected by Raman, Fourier transform infrared absorption spectrometry (FTIR), and X-ray photoelectron spectroscopy (XPS) characterization. The micromorphology and surface roughness of the film were observed and analyzed by atomic force microscopy (AFM). The results indicated that all the prepared films presented a diamond-like carbon structure. The relative content of fluorine in the films increased, containing more CF2groups. The ratio of hybrid structure sp3/sp2decreased. The surface roughness of the films increased when the gas flow ratioR(R = CF4/[CH4 + CF4]) or the deposition power increased. The contact angle of water with the surface of the F-DLC film was measured with a static drop-contact angle/surface tension measuring instrument. The hydrophobic property of the F-DLC films was found to be dependent on the sp2structure, fluorine content, and surface roughness of the films. The contact angle increased when the relative content of fluorine in the films and sp2content increased, whereas the contact angle first increased and then decreased with the surface roughness.

scholarly journals Elements-Added Diamond-Like Carbon Film for Biomedical Applications

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Narin Sunthornpan ◽  
Shuichi Watanabe ◽  
Nutthanun Moolsradoo
Keyword(s):  
Surface Roughness ◽  
Contact Angle ◽  
Friction Coefficient ◽  
Biomedical Applications ◽  
Carbon Film ◽  
Diamond Like Carbon ◽  
Cytotoxicity Test ◽  
Aisi 316L ◽  
Gaseous Mixtures ◽  
Dlc Film

Elements-added diamond-like carbon films for biomedical applications were investigated. The aim of this work was to study the effects of the elemental contents (silicon and silicon-nitrogen) in a DLC film on its properties for biomedical applications. Pure DLC, Si-DLC, and Si-N-DLC films were prepared from C2H2, C2H2 : TMS, and C2H2 : TMS : N2 gaseous mixtures, deposited on an AISI 316L substrate using the plasma-based ion implantation (PBII) technique. The structure of films was analyzed using Raman spectroscopy. The chemical composition of films was measured using energy dispersive X-ray spectroscopy (EDS). The average surface roughness of films was measured by using a surface roughness tester. The hardness and elastic modulus of films were measured by using a nanoindentation hardness tester. The friction coefficient of films was determined using a ball-on-disk tribometer. The surface contact angle was measured by a contact angle measurement. The corrosion performance of each specimen was measured using potentiodynamic polarization. The biocompatibility property of films was conducted using the MTT assay cytotoxicity test. The results indicate that the Si-N-DLC film shows the best hardness and friction coefficient (34.05 GPa and 0.13, respectively) with a nitrogen content of 0.5 at.%N, while the Si-DLC film with silicon content of 14.2 at.%Si reports the best contact angle and corrosion potential (92.47  and 0.398 V, respectively). The Si-N-DLC film shows the highest cell viability percentage of 81.96%, which is lower than the uncoated AISI 316L; this is a considerable improvement. All specimens do not demonstrate any cytotoxicity with approximate viabilities between 74% and 107%, indicating good biocompatibilities.

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°.

The Biocompatibility of Ti Alloy Improved by Nitrogen-Doped Diamond-Like Carbon Films

2014 ◽  
Vol 711 ◽  
pp. 250-254 ◽  
Author(s):  
Wufanbieke Baheti ◽  
Ming Xin Li ◽  
Fu Guo Wang ◽  
Jin Ge Song ◽  
Long Hua Xu ◽  
...  
Keyword(s):  
Contact Angle ◽  
Photoelectron Spectroscopy ◽  
Carbon Film ◽  
Chemical Vapor ◽  
Carbon Films ◽  
Diamond Like Carbon ◽  
Measuring Device ◽  
Nitrogen Doped ◽  
Angle Measuring ◽  
N Doping

The nitrogen-doped diamond-like carbon film was prepared on Ti6Al4V alloy by using plasma enhanced chemical vapor deposition (PECVD) technique,and its biocompatibility was studied.The surface morphology,chemical composition and contact angle were measured by scanning electron microscope (SEM),X-ray photoelectron spectroscopy(XPS),Raman Spectrometer and contact angle measuring device. Finally, the proliferation rate and cellular morphology of 3T3-E1 osteoblast cells on different sample surfaces were tested and Image J software was used to statistically analyze the count of the adhered cells. The results showed that cell adhesion and proliferation were significantly (P<0.05) increased on nitrogen-doped diamond-like carbon films , which illustrated that N doping improved the biocompatibility of DLC films. This finding has potential clinical application value to modify titanium alloy for new bone formation.

scholarly journals Glaze Icing on Superhydrophobic Coating Prepared by Nanoparticles Filling Combined with Etching Method for Insulators

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Chao Guo ◽  
Ruijin Liao ◽  
Yuan Yuan ◽  
Zhiping Zuo ◽  
Aoyun Zhuang
Keyword(s):  
Contact Angle ◽  
Photoelectron Spectroscopy ◽  
Superhydrophobic Surface ◽  
Power Transmission ◽  
Contact Angle Hysteresis ◽  
Transmission System ◽  
Sliding Angle ◽  
Power Transmission System ◽  
Etching Method ◽  
Xps Characterization

Icing on insulators may cause flashover or even blackout accidents in the power transmission system. However, there are few anti-icing techniques for insulators which consume energy or manpower. Considering the water repelling property, the superhydrophobic surface is introduced for anti-icing of insulators. Among the icing forms, the glaze icing owns the highest density, strongest adhesion, and greatest risk to the power transmission system but lacks researches on superhydrophobic surface. In this paper, superhydrophobic surfaces with contact angle of 166.4°, contact angle hysteresis of 0.9°, and sliding angle of less than 1° are prepared by nanoparticle filling combined with etching method. The coated glass slide and glass insulator showed excellent anti-icing performance in the glaze icing test at −5°C. The superhydrophobicity and anti-icing property of the coatings benefit from the low surface energy and hierarchical rough structure containing micron scale pits and nanoscale coralloid bulges supported by scanning electron microscopy (SEM), atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS) characterization.

Diamond-Like Carbon Films for Silicon Passivation in Microelectromechanical Devices

1995 ◽  
Vol 383 ◽  
Author(s):  
M. R. Houston ◽  
R. T. Howe ◽  
K Komvopoulos ◽  
R. Maboudian
Keyword(s):  
Contact Angle ◽  
Surface Properties ◽  
Photoelectron Spectroscopy ◽  
Microelectromechanical Systems ◽  
Adhesion Force ◽  
Contact Angles ◽  
Vacuum Arc ◽  
Diamond Like Carbon ◽  
Adhesion Forces ◽  
Water Contact

ABSTRACTThe surface properties of diamond-like carbon (DLC) films deposited by a vacuum arc technique on smooth silicon wafers are presented with specific emphasis given to stiction reduction in microelectromechanical systems (MEMS). The low deposition temperatures afforded by the vacuum arc technique should allow for easy integration of the DLC films into the current fabrication process of typical surface micromachines by means of a standard lift-off processing technique. Using X-ray photoelectron spectroscopy (XPS), contact angle analysis, and atomic force microscopy (AFM), the surface chemistry, microroughness, hydrophobicity, and adhesion forces of DLC-coated Si(100) surfaces were measured and correlated to the measured water contact angles. DLC films were found to be extremely smooth and possess a water contact angle of 87°, which roughly corresponds to a surface energy of 22 mJ/m2. It is shown that the pull-off forces measured by AFM correlate well with the predicted capillary forces. Pull-off forces are reduced on DLC surfaces by about a factor of five compared to 10 nN pull-off forces measured on the RCA-cleaned silicon surfaces. In the absence of meniscus forces, the overall adhesion force is expected to decrease by over an order of magnitude to the van der Waals attractive force present between two DLC-coated surfaces- To further improve the surface properties of DLC, films were exposed to a fluorine plasma which increased the contact angle to 99° and lowered the pull-off force by approximately 20% over that obtained with as-deposited DLC. The significance of these results is discussed with respect to stiction reduction in micromachines.

Developing an acidproof breathable composite fabric based on fluorinated polyurethane/isotropic pitch electrospun nanofibers

2019 ◽  
Vol 50 (6) ◽  
pp. 891-905
Author(s):  
Yiqing Shao ◽  
Qingle Zhang ◽  
Jianjian Gong ◽  
Xin Xia
Keyword(s):  
Contact Angle ◽  
Photoelectron Spectroscopy ◽  
Mechanical Test ◽  
Fluorine Content ◽  
Acid Resistance ◽  
Electrospun Nanofibers ◽  
Water Vapor Transport ◽  
High Porosity ◽  
Fluorinated Polyurethane ◽  
Composite Fabrics

To develop a series of novel acidproof and breathable fabric, electrospun fluorinated polyurethane/polyurethane and pitch nanofibers were directly deposited on polyester/cotton blended fabric. The layered and interpenetrated structured membranes were built to study the effects of different structures on the acidproof and breathable performances. The acidproof and breathable mechanism of different structured composite fabrics had been evaluated via emission scanning electron microscope, X-ray photoelectron spectroscopy, contact angle, porosity, pore size, comfort and mechanical test, respectively. The results showed that the layered structured composite fabric had advantages in acidproof property, i.e. the acid (H2SO4, 80%) contact angle was 130° due to the low surface energy caused by the high fluorine content (36.96%). Meanwhile, such structured composite fabric provided double protection, which made the acid-resistance pressure to reach a high value of 1050 Pa, while the interpenetrated structured composite fabric showed superior comfort and mechanical properties. Due to the high porosity (88.01%), the water vapor transport rate and air permeability were 7554.14 g/m2·24h and 46.33 mm/s, respectively. Due to the relative slip of fluorinated polyurethane/polyurethane fibers was restricted, the tensile strength and bursting strength of interpenetrated one was 1315 N and 795 N, which were higher than layered one.

Encapsulating Annealing of N+ Implanted 4H-SiC by Diamond-Like-Carbon Film

2007 ◽  
Vol 556-557 ◽  
pp. 583-586 ◽  
Author(s):  
Shingo Miyagawa ◽  
Tomoyuki Suzuki ◽  
Takahiro Kudo ◽  
Masataka Satoh
Keyword(s):  
Surface Roughness ◽  
Total Dose ◽  
Room Temperature ◽  
Carbon Film ◽  
Annealed Sample ◽  
Surface Roughening ◽  
Diamond Like Carbon ◽  
Mean Square ◽  
Dlc Film ◽  
Diamondlike Carbon

The encapsulating annealing of N+ implanted 4H-SiC(0001) is performed using diamondlike- carbon (DLC) films for the suppression of surface roughening. 4H-SiC(0001) sample with an off-orientation of 8o is multiply implanted by N+ with energy ranging from 15 to 120 keV at a total dose of 2.4×1015 cm-2 at room temperature. DLC films with thickness ranging from 0.3 to 1.8 μm are deposited on the surface of implanted sample using plasma-based ion implantation equipment with C2H4 gas. The DLC capped sample is annealed at 1500 oC for 5 min using IR image annealer. After annealing, DLC film is removed by the oxidization. The sample capped by DLC film with a thickness of 0.3 μm shows the root mean square (RMS) surface roughness of 0.6 nm while the annealed sample without DLC film shows RMS surface roughness of 5.2 nm. As the thickness of DLC film is increased from 0.3 to 1.8 μm, the RMS surface roughness is decreased from 0.6 to 0.2 nm.

scholarly journals Surface Modification of Polyethersulfone (PES) with UV Photo-Oxidation

Technologies ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 36
Author(s):  
Ibrahim Cisse ◽  
Sarah Oakes ◽  
Shreen Sachdev ◽  
Marc Toro ◽  
Shin Lutondo ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Contact Angle ◽  
Atomic Force Microscopy ◽  
Photoelectron Spectroscopy ◽  
Water Contact ◽  
X Ray ◽  
Force Microscopy ◽  
Photo Oxidation ◽  
Atomic Force ◽  
Modified Surfaces

Polyethersulfone (PES) films are widely employed in the construction of membranes where there is a desire to make the surface more hydrophilic. Therefore, UV photo-oxidation was studied in order to oxidize the surface of PES and increase hydrophilicity. UV photo-oxidation using low pressure mercury lamps emitting both 253.7 and 184.9 nm radiation were compared with only 253.7 nm photons. The modified surfaces were characterized using X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and water contact angle (WCA) measurements. Both sets of lamps gave similar results, showing an increase of the oxygen concentration up to a saturation level of ca. 29 at.% and a decrease in the WCA, i.e., an increase in hydrophilicity, down to ca. 40°. XPS detected a decrease of sp2 C-C aromatic group bonding and an increase in the formation of C-O, C=O, O=C-O, O=C-OH, O-(C=O)-O, and sulphonate and sulphate moieties. Since little change in surface roughness was observed by AFM, the oxidation of the surface caused the increase in hydrophilicity.

Wear Behavior of Diamond-Like Carbon Film Coated by Filtered Cathodic Arc

2012 ◽  
Vol 622-623 ◽  
pp. 901-905
Author(s):  
Nattaporn Khamnaulthong ◽  
Krisda Siangchaew ◽  
Pichet Limsuwan
Keyword(s):  
Wear Resistance ◽  
Photoelectron Spectroscopy ◽  
Wear Behavior ◽  
Carbon Film ◽  
Diamond Like Carbon ◽  
Carbon Oxidation ◽  
Film Properties ◽  
X Ray ◽  
Dlc Film ◽  
Cathodic Arc

Diamond-like carbon (DLC films were deposited on NiFe coupon by Filtered Cathodic Arc (FCA) technique. Two different DLC thicknesses were selected to compare thickness dependency on film properties change. The mechanical property as wear resistance under cyclic heating condition was investigated by nanoindenter (Hysitron). The detail of DLC film composition change was also studied using X-ray Photoelectron Spectroscopy (XPS). The roles of heating in material composition and wear behavior of DLC films are discussed. The effect of DLC film thickness is also considered. The results showed that thinner DLC (2 nm) has higher carbon oxidation resulting that deteriorate in wear resistance as compare to thicker one (5 nm). The heating accelerates these oxidation and wear in this study. .

Fabrication and Characterization of Fluorinated Polyimides (PI) Films with Improved Hydrophobic Property

NANO ◽  
2018 ◽  
Vol 13 (07) ◽  
pp. 1850080
Author(s):  
Yonghong Peng ◽  
Shuai Zhang ◽  
Fanghua Zhu ◽  
Wa Li ◽  
Yong Yi ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Contact Angle ◽  
Composite Film ◽  
Plasma Treatment ◽  
Inertial Confinement Fusion ◽  
Composite Films ◽  
Film Surface ◽  
Inertial Confinement ◽  
Hydrophobic Property ◽  
Fluorinated Polyimide

There is a demand for composite films with excellent hydrophobic properties in inertial confinement fusion (ICF) physics experiments. In this paper, we prepared fluorinated polyimide hydrophobic films using spinning and plasma etching methods. The experimental results indicate that the water contact angle for the perfluorodecyltrichlorosilane (PFTS) treatment polyimide (PI) film is 112.0[Formula: see text], which is larger than the pure PI film [Formula: see text]. The rap oil contact angle is 84.2[Formula: see text], which is also much larger than the contact angle of PI film [Formula: see text]. Moreover, the surface roughness of the prepared films was measured by white light interferometry (WLI). The surface roughness (Ra) of pure PI is 9.79[Formula: see text]nm, but with the application of FSiO2 particles, the Ra of the films increases to 65.05[Formula: see text]nm. After plasma treatment, the Ra of the PI/FSiO2 composite film increases to 186.71[Formula: see text]nm because plasma treatment can scratch the film surface and increase its roughness. However, treating the PI/FSiO2 composite film with the plasma and PFTS, the Ra is only 88.90[Formula: see text]nm. This decrease in Ra is due to the PFTS, which is able to reduce the surface roughness. The development of composite films, compared to pure PI films, could prove to be an extremely valuable material in ICF experiments.

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