Surface Roughness and Seeding Process Influence on Boron Doped Micro/Nanocrystalline Diamond Adhesion on Titanium Substrate_ Crimson Publishers

Surface Roughness and Seeding Process Influence on Boron Doped Micro/Nanocrystalline Diamond Adhesion on Titanium Substrate by Silvia S Oishi* in Trends in Textile Engineering & Fashion Technology_

Journal of Textile Science and Engineering

 

Abstract
CVD (Chemical Vapor Deposition) diamond deposition on different materials requires surface treatment such as diamond particles seeding on the substrate dispersed in an appropriate solvent by using ultrasonic agitation. On the other hand, seeding process by electrostatic attraction of nanodiamond particle have produced films with higher nucleation density compared to that obtained from ultrasonic treatment. In addition, nucleation and growth of micro/nanocrystalline boron doped diamond films (BDD/NBDD) on titanium (Ti) substrates represent a complex process, mainly due to the poor film adhesion related to the difference in the thermal expansion coefficients between the film and the substrate. Thus, the substrate morphology associated to the seeding process can be determinant for this adhesion. In this context, the adhesion of BDD and NBDD films on Ti substrate was systematically considered in five different Ti surface roughness associated to two different seeding processes: ultrasonic agitation with 0.25μm diamond particle and electrostatic seeding with 4nm diamond particle in potassium chloride.

Thus, twenty different diamond film sample sets were grown by CVD technique following the combinations of BDD and NBDD morphologies, Ti roughnesses, and seeding methodologies. The samples were characterized by scanning electron microscopy, Raman scattering spectroscopy, and X-ray diffraction (XRD). The adhesion tests were performed by the Rockweel hardness test according to VDI 3198. The results showed that the BDD and NBDD films grown with electrostatic seeding with 4nm diamond particle presented the best adhesion regardless of substrate roughness while only the Ti substrates with higher roughness presented good adhesion for ultrasonic agitation pre-treatment with 0.25μm diamond particle. These results indicate that the electrostatic seeding pre-treatment associated with greater surface roughness have an important role in improving diamond films adhesion for the two studied morphologies.

Keywords: Micro/nanocrystalline boron doped diamond; HFCVD; Diamond seeding; Titanium; Adhesion

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Ageing and Health Services Use in Israel- Crimson Publishers

Ageing and Health Services Use in Israel by Ariela Lowenstein in Health Services

Israel, as many other countries, must cope with issues that arise from demographic changes that are expressed both in the size and composition of the population. One of the prominent changes is in the age-structure of the society, which is especially influenced by the ageing of the population. Israel's population consists of 12.8% Jewish elders and 4.4% Arab elders. However, the proportion of disabled Jewish elders is 16% compared with 31% among Arab elders [1]. Disability leads to loss of independence, increases consumption of health services, and raises the cost of medical treatments. Among minorities, lower rates in Health Services use were found, since cultural differences are often not considered. Lack of sensitivity towards minority needs may lead to a gap between potential consumers and existing services [2-6].

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Gerontology & Geriatrics Studies (ISSN: 2578-0093)

Gerontology & Geriatrics studies is a multidisciplinary journal for the publication of work from all areas of bio gerontology, with an emphasis on studies focused at the systems level of investigation, such as whole organisms, immune, endocrine and cellular systems, as well as whole population studies. Gerontology & Geriatrics studies welcomes researchers to publish their research work and wide variety of reviews, case reports, mini reviews, short communication, opinions etc. Gerontology & Geriatrics studies publishes articles on the biological aspects of aging which covers biochemistry, biodemography, comparative and evolutionary biology, endocrinology, cellular and molecular biology, exercise sciences, genetics, immunology, morphology, neuroscience, nutrition, pathology, physiology and biological underpinnings of late life diseases. Basic aspects of regeneration in diverse investigatory biological systems as well as in the context of medical applications, which dealt with a special section that also contains information on technological advances for the elderly. Gerontology & Geriatrics studies publishes international forum for the information that has clear and immediate applicability to health, care, and quality of life of the aged.

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