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Sorcar, Saurav,Thompson, Jamie,Hwang, Yunju,Park, Young Ho,Majima, Tetsuro,Grimes, Craig A.,Durrant, James R.,In, Su-Il The Royal Society of Chemistry 2018 Energy & environmental science Vol.11 No.11
<P>The production of solar fuels offers a viable pathway for reducing atmospheric CO2 concentrations and the storage and transport of solar energy. While photoconversion of CO2 into C1 hydrocarbon products, notably methane (CH4), is known, the ability to directly achieve significant quantities of higher-order hydrocarbons represents an important step towards practical implementation of solar fuel technologies. We describe an efficient, stable, and readily synthesized CO2-reduction photocatalyst, Pt-sensitized graphene-wrapped defect-induced blue-coloured titania, that produces a record high combined photocatalytic yield of ethane (C2H6) and methane. For the first time, a systematic ultraviolet photoelectron spectroscopy study on the mechanism underlying ethane formation indicates that the process is dependent upon upward band bending at the reduced blue-titania/graphene interface. Furthermore, transient absorption spectroscopy indicates photogenerated holes move into the graphene while electrons accumulate on the Ti<SUP>3+</SUP> sites, a phenomenon contradicting prior assumptions that graphene acts as an electron extractor. We find that both mechanisms serve to enhance multielectron transfer processes that generate ˙CH3. Utilizing a continuous flow-through (CO2, H2O) photoreactor, over the course of multiple 7 h runs approximate totals of 77 μmol g<SUP>−1</SUP> C2H6 and 259 μmol g<SUP>−1</SUP> CH4 are obtained under one sun AM 1.5G illumination. The photocatalyst exhibits an apparent quantum yield of 7.9%, 5.2% CH4 and 2.7% C2H6, and stable photocatalytic performance over the test duration of 42 h. The carbon source for both products is verified using <SUP>13</SUP>CO2 isotopic experiments.</P>
The Biocompatibility of Nanoporous Acupuncture Needles
Sorcar, Saurav,Grimes, Craig A.,In, Su-Il Elsevier Science B.V., Amsterdam 2018 JOURNAL OF ACUPUNCTURE AND MERIDIAN STUDIES Vol.11 No.3
<P><B>Abstract</B></P> <P>We investigate the biocompatibility of a new class of acupuncture needles that possess a hierarchical nano/microscale porous surface topology, referred to as porous acupuncture needles (PAN). The PAN is synthesized via a facile electrochemical anodization technique by which a surface area approximately 20 times greater than a conventional acupuncture needle, of approximately the same diameter, is obtained. PAN biocompatibility is evaluated using a variety of standard tests, with results indicating that the PAN can safely be used within therapeutic practice.</P>
( Saurav Sorcar ),인수일 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
In the present work we report a facile and readily-scalable electrochemical anodization technique for preparation of superhydrophilic TiO<sub>2</sub> films having reversible wettability properties. The electrochemically anodized Titanium (Ti) foils manifest nanoscale topographical features, interconnected nanowebs and nanofibrils, that enhance both surface roughness and light absorption. After 5 min of UV illumination a water contact angle (WCA) of 4.8° is measured for a 5 μL deionized water droplet, while after 5 min of whitelight illumination the WCA is 3.2°. Moreover, under UV illumination the superhydrophilic Ti foils exhibit self-cleaning properties. Key factors contributing to the superhydrophilic character include surface topology, and surface chemical reactions.
( Saurav Sorcar ),인수일 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Photocatalytic reduction of CO<sub>2</sub> to fuel offers an exciting opportunity for helping to solve current energy and global warming problems. Although a number of solar active catalysts have been reported, most of them suffer from low product yield, instability and low quantum efficiency. Therefore, the design and fabrication of highly active photocatalysts remains an unmet challenge. In the present work we utilize hydrogen doped, blue-colored reduced titania for photocatalytic conversion of CO<sub>2</sub> into methane (CH<sub>4</sub>). The photocatalyst is obtained by exposure of TiO<sub>2</sub> to NaBH<sub>4</sub> at 350 °C for 0.5 h. Sensitized with Pt nanoparticles, the material promotes solar spectrum photoconversion of CO<sub>2</sub> to CH<sub>4</sub> with an apparent quantum yield of 12.40 % and a time normalized CH<sub>4</sub> generation rate of 80.35 micromolg<sup>-1</sup>h<sup>-1</sup>, which to the best of our knowledge is a record for photocatalytic based CO<sub>2</sub> reduction.
Saurav Sorcar,Abdul Razzaq,Haining Tian,Craig A. Grimes,인수일 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.46 No.-
In the present work we report a facile and readily-scalable electrochemical anodization technique forpreparation of superhydrophilic TiO2 [3TD$DIF]films having reversible wettability properties. The electrochemicallyanodized[34TD$DIF] Titanium [35TD$DIF](Ti[36TD$DIF]) foils manifest nanoscale topographical features, interconnected nanowebsand nanofibrils, that enhance both surface roughness and light absorption. After 5 min of UVillumination a water contact angle (WCA) of 4.88 is measured for a 5 mL [37TD$DIF]deionized water droplet, whileafter 5 min of [38TD$DIF]whitelight illumination the WCA is 3.28. Moreover, under UV illumination thesuperhydrophilic Ti foils exhibit self-cleaning properties. Key factors contributing to the superhydrophiliccharacter include surface topology, and surface chemical reactions.
The Biocompatibility of Nanoporous Acupuncture Needles
Saurav Sorcar,Craig A. Grimes,인수일 사단법인약침학회 2018 Journal of Acupuncture & Meridian Studies Vol.11 No.3
We investigate the biocompatibility of a new class of acupuncture needles that possess ahierarchical nano/microscale porous surface topology, referred to as porous acupunctureneedles (PAN). The PAN is synthesized via a facile electrochemical anodization techniqueby which a surface area approximately 20 times greater than a conventional acupunctureneedle, of approximately the same diameter, is obtained. PAN biocompatibility is evaluatedusing a variety of standard tests, with results indicating that the PAN can safely beused within therapeutic practice.