Papers by Keyword: Mica

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Authors: V. Manić, Lj. Miljković, B. Đurić-Stanojević
Authors: Yu Zhang Wang, Jing Jie Sha, Lei Liu, Hong Yan Fu, Yun Fei Chen
Abstract: For studying DNA electrical double layer in electrolyte solution, the key process is to create the template for DNA processing. In this paper, we described a straightforward method for depositing DNA on a substrate. The mica was chosen as the substrate materials because of its atomically flat and negatively charged surface in solution, and mica was coated by the polylysine to absorb the DNA molecules. Using by AFM, the DNA molecules have been probed obtaining a high resolution in air and liquid, and the method is simple and easy operated. This method can be used for nano-manipulation and the quality of the DNA under physiological conditions.
Authors: K. Yamana, M. Miyamoto, Satoshi Nakamura, K. Kihara
Authors: Hong Ya Wu, Ji Zhou
Abstract: The anisotropic permittivity of fluorophlogopite and biotite was measured as a function of frequency in directions along and perpendicular to the cleavage planes. The measurements were performed using an impedance analyzer in the frequency range between 0.01MHz and 10MHz at room temperature. Micas showed anisotropic dielectric properties and the anisotropy of biotite was stronger than fluorophlogopite. The permittivity reduced with the increase of frequency. These properties depended on the structure, composition and defects of micas.
Authors: A. Paszternák, A. Pilbáth, Z. Keresztes, Ilona Felhősi, J. Telegdi, Erika Kálmán
Abstract: The layer formation of phosphonic acids on mica surface as a model system, from aqueous and ethanol solutions has been investigated. The aggregation behavior (critical micelle concentration, cmc) of molecules in the solution phase has been determined by surface tension measurements in order to select the appropriate concentration for the layer formation experiments. Layer formation of self-assembling molecules of alkyl-phosphonic acids has been followed by atomic force microscopy (AFM). Nucleation, growth and coalescence of densely packed islands of phosphonates from ethanol solution have been recorded on mica surface. The structure of islands depends on the length of alkyl-chains. Self-assembly of phosphonates has been also observed from aqueous solution, as presented by octyl-phosphonic acid (OcPA). The height of OcPA islands is 1.46 􀁲 0.22 nm, which is practically equal with the length of molecule (1.4 nm). This shows that OcPA molecules form monolayer height domains on the mica surface.
Authors: Jun Su, Cai Hong Li

This paper examined the effect of addition of four polyolefins and mica on colorimetry of ethylene propylene diene rubber (EPDM) composites. The results illustrate that the addition of mica can turn EPDM control from lighter, redder, and yellower to darker, greener and bluer, respectively. The total color change (ΔE) of EPDM/mica composites changed with various types of polyolefins. Ethylene alpha olefin (POE) with lowest crystallinity decrease the Δa of EPDM/mica composites to the greatest extent, while EPDM/mica/Polypropylene (PP) composite, with highest crystallinity of PP, has little change of the lightness value.

Authors: S. Eabenrajkumar, K. Palanikumar, Pitchandi Kasivisvanathan
Abstract: Metal Matrix Composites are being widely used in numerous applications like aerospace, Automobiles, Consumer goods etc. However, machining of these composites are being faced a lot of drawbacks in terms of increases in thrust force, machined surface roughness and tool wear etc. due to reinforcements of high hardness. In this paper, thrust forces in drilling of Al6061/mica composites with 1 and 3 weight% are recorded from Dynamometer for analysis. Cutting tool material of Tungsten carbide coated with TiAlN with 8 mm diameter was used. Al 6061/Micap composites were scrutinized on cast surface with the help of optical microscope. Also, Thrust force was analysed for different Cutting Speed and feed. It can be concluded that, as weight% of mica increases Thrust forces were decreased.
Authors: Bai Jia, Chaysuwan Duangrudee
Abstract: SiO2, Al2O3, MgO, MgF2, SrCO3, CaCO3, CaF2 and P2O5 were used to prepare machinable glass-ceramic with 4 mol% of fluorapatite for restorative dental applications. XRD showed that the glass heat treated at 792°C (the first crystallization temperature+20°C) for 6 hours consisted of calcium-mica, fluorapatite, strontium apatite, anorthite, forsterite, fluorite and stishovite crystalline phases. The microstructures of the resultant glass-ceramic, observed by SEM, were found to exhibit plate-like mica crystals and many tabular particles embedded in the mica phases. The particles, determined by EDS, were rich in calcium. The three-point bending strength (158 MPa) closely matched that of nature tooth. Average Vickers hardness of the received glass-ceramic (2.6 GPa) was lower than that of natural tooth.
Authors: Gultekin Goller, Ipek Akin
Abstract: The aim of this study is to investigate the crystallization behavior and in-vitro bioactivity character of glass ceramics having 3:7 weight ratio of fluorapatite (Ca10(PO4)6F2) to potassium mica (K2Mg3AlSi3O10F2) as a function of cerium oxide addition, and compare the morphology of hydroxycarbonate apatite (HCA) layer formation depending on cerium oxide addition.
Authors: Nurbaiti Abdul Hanid, Mat Uzir Wahit, Qi Peng Guo
Abstract: A series of regenerated cellulose (RC) nanocomposites which were incorporated with the layered silicate mica were successfully prepared via ionic liquid. The effect of the mica loadings was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The mechanical properties which were investigated via tensile testing indicated that upon the introduction of the mica displayed a significant enhancement on the mechanical stability of the RC. The results showed the potential of mica to reinforce the RC polymers matrix.
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