scholarly journals Effect of Cr Layer on the Structure and Properties of Cr/DLC Films

2016 ◽  
Vol 18 (4) ◽  
pp. 275
Author(s):  
Xiaohong Jiang ◽  
A.V. Rogachev ◽  
D.G. Piliptsou
Keyword(s):  
Crystal Surface ◽  
Chemical Properties ◽  
Carbon Films ◽  
Substantial Improvement ◽  
Structure And Properties ◽  
Double Crystal ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Arc Deposition ◽  
And Chemical Properties

This paper focuses on the Cr interlayer effect on the structure and properties of Cr/DLC films. To improve structural, mechanical and chemical properties of a-C films, we developed two layer chromium-carbon films produced by cathode magnetic filtered arc deposition. Microstructure and properties of these films are explained depending on the Cr-interlayer size. The structure is analyzed by Raman spectroscopy. Moreover, we also estimated residual stress, the friction coefficient, hardness, the elastic modulus and corrosion parameters by X-ray double crystal surface profilometry, tribotesting, nanoindenter-testing, as well as contact angle measurements and potentiodynamic polarization analysis. As a result of the comparative analysis, we revealed a substantial improvement in the characteristics of the produced two layer films. The results provide theoretical basis for the application of these films.

On Studying Surface and Nanomechanical Properties of Ti-O Films by Alkali Treatment

2011 ◽  
Vol 138-139 ◽  
pp. 821-825 ◽  
Author(s):  
Feng Wen ◽  
Yang Cao ◽  
Yu Zhou
Keyword(s):  
Contact Angle ◽  
Treatment Time ◽  
Alkali Treatment ◽  
Chemical Properties ◽  
Nanomechanical Properties ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Micro Arc Oxidation ◽  
The Times ◽  
And Chemical Properties

Titanium oxide (Ti-O) films have been widely used in the fields of electron, photology and medicine due to its distinctive optical, electrical and chemical properties. In this paper, Ti-O films were synthesized by micro-arc oxidation firstly, and then surface was modified by NaOH alkali solution under different treatment time. The wettabilities of as-prepared films were investigated by contact angle measurements using four common liquids. nanoindentation was adopted to obtain the films’ nanohardness and modulus. The results show that Ti-O films tend towards hydrophilia and its surface energy increased after alkali treatment, but no obvious effects to nanohardness and modulus of Ti-O films. Surface roughness of Ti-O films increases after alkali treatment firstly, but decreased with continuing to increasing the times of alkali treatment.

New, Highly Structured Carbon Black of the OMCARB Series for Reducing the Hysteresis in Rubber. Part 1. Features of the Structure and Properties of Carbon Black

2016 ◽  
Vol 43 (12) ◽  
pp. 17-22
Author(s):  
G.V. Moiseevskaya ◽  
G.I. Razd'yakonova ◽  
A.A. Petin ◽  
E.A. Strizhak
Keyword(s):  
Carbon Black ◽  
Chemical Properties ◽  
Morphological Characteristics ◽  
Structural Data ◽  
Structure And Properties ◽  
Elastomeric Materials ◽  
Rubber Part ◽  
Average Size ◽  
Branched Structure ◽  
And Chemical Properties

The aim of this work was to study the properties of carbon black CH85 of the OMCARB series and to compare them with the properties of standard carbon blacks N339 and N234. The morphological characteristics, the size distribution of the globules and aggregates, the surface area, the proportion of micropore area, the degree of branching of aggregates, and also the mechanical and chemical properties were measured and calculated. The average size of the aggregates of CH85 is greater than that of N339 and N234, and the aggregates have a more open and branched structure. The iodine adsorption by CH85 is practically the same as that by N339 and lower than that by N234. The low-hysteresis index calculated on the basis of structural data is much better for CH85. This opens up the possibility of using this type of carbon black for the development of elastomeric materials with low hysteresis.

Improvement of Hydrophilic Stability of Diamond-Like Carbon Films by O2/CF4 Plasma Post-Treatment

2015 ◽  
Vol 1125 ◽  
pp. 38-44
Author(s):  
Chavin Jongwannasiri ◽  
Shuichi Watanabe
Keyword(s):  
Carbon Films ◽  
Post Treatment ◽  
Attenuated Total Reflectance ◽  
Diamond Like Carbon ◽  
Total Reflectance ◽  
Force Microscopy ◽  
Angle Measurements ◽  
Atomic Force ◽  
Contact Angle Measurements ◽  
Before And After

In this article, the results obtained from a study carried out on the plasma post-treatment of diamond-like carbon (DLC) films using an oxygen/tetrafluoromethane (O2/CF4) gas mixture is reported. The surface morphology and chemical bonding of the films before and after the plasma post-treatment were characterized using atomic force microscopy (AFM) and attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy. The effect of adding CF4 to the O2 plasma on the wettability of the films was also examined using contact angle measurements. The results indicate that the surface roughness increased with the addition of CF4 to the O2 plasma, whereas oxygen-and fluorinated-based functional groups were generated on the surface of the DLC films submitted to O2/CF4 plasma post-treatment. The surface energy also decreased with increasing CF4 fraction, causing the surface of the films to be hydrophobic. Furthermore, the films containing 20% CF4 exhibited higher hydrophilic stability than the others. Thus, the addition of a small amount of CF4 to O2 plasma can be considered beneficial in improving the hydrophilic stability of surface of DLC films.

Structure and properties of 2-[(E)-2-(4-dipropylaminophenyl)-1-ethenyl]-1,3,3-trimethyl-3H-indolium chloride

2013 ◽  
Vol 67 (4) ◽  
Author(s):  
Martina Lešková ◽  
Yaroslav Bazel ◽  
Marcel Torok ◽  
Yaroslav Studenyak
Keyword(s):  
Theoretical Study ◽  
Chemical Properties ◽  
Molar Absorptivity ◽  
Structure And Properties ◽  
Acid Base ◽  
Analytical Wavelength ◽  
Styryl Dye ◽  
Wide Range ◽  
Charged Form ◽  
And Chemical Properties

AbstractThe structure of styryl dye, 2-[(E)-2-(4-dipropylaminophenyl)-1-ethenyl]-1,3,3-trimethyl-3H-indolium chloride (I), was investigated using methods such as UV-VIS, fluorescence spectroscopy, and NMR (1H, 13C, APT, HMQC, COSY) and also by examining its electrochemical properties. A study of the acid-base properties revealed the existence of three different forms of the dye. The mechanisms of protolysis and hydrolysis are discussed. The reagent exists in a reactive single-charged form I + over a wide range of acidity (pH 4–11). The optimum analytical wavelength of the singlecharged form is 550 nm, where the molar absorptivity is 5.51 × 104 L mol−1 cm−1. The values of the optimum analytical wavelength and molar absorptivity of the protolysed and hydrolysed forms are: λ max(I-H2+) = 380 nm, ɛ(I-H2+) = 2.01 × 104 L mol−1 cm−1; λ max(I-OH) = 320 nm, ɛ(I-OH) = 1.12 × 104 L mol−1 cm−1. A theoretical study of the spectral and chemical properties of I was carried out by performing quantum chemical calculations.

The Structure and Properties of Some Urons and Thiourons

1969 ◽  
Vol 39 (2) ◽  
pp. 140-147 ◽  
Author(s):  
C. D. Egginton ◽  
C. P. Vale
Keyword(s):  
Nmr Spectroscopy ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Structure And Properties ◽  
Physical And Chemical ◽  
And Chemical Properties

A number of compounds containing the uron ring have been synthesized and their structures confirmed using nmr spectroscopy. Analogous compounds containing a thiouron ring derived from thiourea have also been prepared and similarly examined. The physical and chemical properties of these compounds have been studied. A number of them have been examined as bases for crease-resistant textile treatment.

Studying Effects of Bias Voltage on Properties, Wettability and Platelet Adhered Behavior of DLC Films Prepared By DC-MFCVAD

2007 ◽  
Vol 353-358 ◽  
pp. 2203-2206
Author(s):  
Feng Wen ◽  
Nan Huang ◽  
Yong Xiang Leng ◽  
Zhi Li ◽  
Yang Cao
Keyword(s):  
Bias Voltage ◽  
Biomedical Applications ◽  
Vacuum Arc ◽  
X Ray ◽  
Magnetic Filter ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Vacuum Arc Deposition ◽  
Scratch Tests ◽  
Arc Deposition

Diamond-Like carbon (DLC) films were prepared under different bias voltage by direct current magnetic filter cathode vacuum arc deposition (DC-MFCVAD). Bias voltages changed from 0 to -200 V. The study intends to investigate the effect on the properties of DLC films for biomedical applications. X-ray photoelectron spectrum (XPS) was used to investigate composition of the films. Nano-scratch tests were used to characterize effects of bias voltage to adhesion. Furthermore, the wettability of the DLC films was investigated by contact angle measurements using four common liquids. Finally, platelet adhesion experiments were done to evaluate the interaction of blood with DLC films. The results showed that the adhesion, wettability and hemo-compatibility of DLC films were affected by bias voltage.

scholarly journals Pepsinogen and Pepsin

1962 ◽  
Vol 45 (4) ◽  
pp. 57-76 ◽  
Author(s):  
Roger M. Herriott
Keyword(s):  
Chemical Properties ◽  
Protein Chain ◽  
Physical And Chemical Properties ◽  
Structure And Properties ◽  
Profound Change ◽  
Pepsinogen A ◽  
Close Proximity ◽  
Unique Manner ◽  
Physical And Chemical ◽  
And Chemical Properties

Evidence relating to the structure and properties of swine pepsinogen and pepsin has been reviewed and used to suggest a tentative two dimensional picture of the skeleton of these two proteins. When pepsinogen, a folded single peptide chain, is converted to pepsin, there is a profound change in the physical and chemical properties of the protein. In an as yet unknown manner, except that it is initiated by a peptic cleavage of the protein chain, a single enzymic site is formed. This site is made up, quite probably, of the secondary carboxyl group of glutamic acid or of aspartic acid and a tyrosine phenol group in close proximity so that they can form hydrogen or hydrophobic bonds with the substrate in some unique manner that permits hydrolysis to occur at an accelerated rate.

scholarly journals Characterization of Active Edible Films based on Citral Essential Oil, Alginate and Pectin

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1980 ◽  
Author(s):  
Valentina Siracusa ◽  
Santina Romani ◽  
Matteo Gigli ◽  
Cinzia Mannozzi ◽  
Juan Cecchini ◽  
...  
Keyword(s):  
Essential Oil ◽  
Transmission Rate ◽  
Chemical Properties ◽  
Barrier Properties ◽  
Edible Films ◽  
Water Contact ◽  
Good Thermal Stability ◽  
Angle Measurements ◽  
Physico Chemical ◽  
Contact Angle Measurements

Thermal, structural and physico-chemical properties of different composite edible films based on alginate and pectin with the addition of citral essential oil (citral EO) as an agent to improve barrier properties, were investigated. The obtained films were clear and transparent, with a yellow hue that increased with citral EO addition. All the films displayed good thermal stability up to 160 °C, with a slight improvement observed by increasing the amount of citral EO in the composites. Gas transmission rate (GTR) strongly depended on the polymer structure, gas type and temperature, with improvement in barrier performance for composite samples. Also, citral EO did not exert any weakening action on the tensile behavior. On the contrary, an increase of the elastic modulus and of the tensile strength was observed. Lastly, water contact angle measurements demonstrated the dependence of the film wettability on the content of citral EO.

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