http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Goel Ashutosh (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
-
Fabrication of an Enzymatic Biofuel Cell with Electrodes on Both Sides of a Microfluidic Channel
Haroon Khan,김철민,Sung Yeol Kim,Sanket Goel,Prabhat K. Dwivedi,Ashutosh Sharma,김영호,Gyu Man Kim 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.6 No.3
Enzymatic biofuel cells (EBFCs) that utilize glucose as fuel in a human body to produce electricity are being explored as promising alternatives to power implantable devices. However, some limitations need to be overcome to render such micro-electronic devices practically applicable. Here, we propose a microfluidic EBFC architecture with electrodes on both sides of the microchannel and its fabrication via stencil method. Multiwalled carbon nanotube (MWCNT) electrodes are fabricated on both sides of a Y-shaped microfluidic channel to reduce the effect of the depletion boundary layer and cross-diffusional mixing of the fuel and oxidant, which are functions of the distance from the microchannel inlet. Therefore, the microchannel length is reduced by half, while maintaining the same MWCNT electrode area. The microchannel is produced by polydimethylsiloxane (PDMS) casting whereas the electrodes are fabricated by a PDMS stencil, using MWCNT patterned on etched indium tin oxide glass. The electrodes are modified with glucose oxidase and laccase via direct covalent bonding. The cell performance is studied at different microchannel heights and flow rates, obtaining a maximum power and current density of 153 µW cm−2 and 450 µA cm−2, respectively, at a microchannel height of 450 µm and flow rate of 25 mL h−1. The double-layer EBFC shows a 23% improvement in the performance compared to a single-layer EBFC.
-
-
Structure-solubility relationships in fluoride-containing phosphate based bioactive glasses
Shaharyar, Yaqoot,Wein, Eric,Kim, Jung-Ju,Youngman, Randall E.,Muñ,oz, Francisco,Kim, Hae-Won,Tilocca, Antonio,Goel, Ashutosh The Royal Society of Chemistry 2015 Journal of Materials Chemistry B Vol.3 No.48
<P>The dissolution of fluoride-containing bioactive glasses critically affects their biomedical applications. Most commercial fluoride-releasing bioactive glasses have been designed in the soda-lime-silica system. However, their relatively slow chemical dissolution and the adverse effect of fluoride on their bioactivity are stimulating the study of alternative biodegradable materials with higher biodegradability, such as biodegradable phosphate-based bioactive glasses, which can be a good candidate for applications where a fast release of active ions is sought. In order to design new biomaterials with controlled degradability and high bioactivity, it is essential to understand the connection between chemical composition, molecular structure, and solubility in physiological fluids. Accordingly, in this work we have combined the strengths of various experimental techniques with Molecular Dynamics (MD) simulations, to elucidate the impact of fluoride ions on the structure and chemical dissolution of bioactive phosphate glasses in the system: 10Na2O-(45 − <I>x</I>)CaO-45P2O5-<I>x</I>CaF2, where <I>x</I> varies between 0-10 mol%. NMR and MD data reveal that the medium-range atomic-scale structure of these glasses is dominated by <I>Q</I><SUP>2</SUP> phosphate units followed by <I>Q</I><SUP>1</SUP> units, and the MD simulations further show that fluoride tends to associate with network modifier cations to form alkali/alkaline-earth rich ionic aggregates. The impact of fluoride on chemical dissolution of glasses has been studied in deionized water, acidic (pH = 3.0), neutral (pH = 7.4) and basic (pH = 9.0) buffer solutions, while the bioactivity and cytotoxicity of glasses has been studied <I>in vitro</I> through their apatite-forming ability in simulated body fluid (SBF) and cell culture tests on mesenchymal stem cells (MSCs), respectively. The macroscopic trends observed from various chemical dissolution and bioactivity studies are discussed on the basis of the effect of fluoride on the atomistic structure of glasses, such as F-induced phosphate network re-polymerization, in an attempt to establish composition-structure-property relationships for these biomaterials.</P>
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
