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A visible-light-sensitive siloxene-based composite material with enhanced photocatalytic activity
Kang, Hyeo Ji,Lee, Sunhye,Jung, Hyuk Joon,Yang, Hee Jung,Lee, Kyu Hyung,Hur, Nam Hwi Elsevier 2018 Journal of photochemistry and photobiology Chemist Vol.365 No.-
<P><B>Abstract</B></P> <P>A novel layer-stacking approach that produces a layered composite of siloxene and reduced graphene oxide (RGO) sheets is presented. This method is based on the assembly of siloxene and graphene oxide sheets, followed by reduction at low temperature using solid hydrazine. High-resolution transmission electron microscopy reveals that the resulting siloxene-RGO composite has a layered structure with sheets that appear to be alternately stacked in a face-to-face fashion. This composite exhibits excellent photocatalytic activity under visible-light irradiation, with a photocurrent density that is about 40 times higher than that of the siloxene sheets alone. It is evident that the RGO sheets stacked on the siloxene surfaces are the key elements that increase the photocatalytic activity of the layered composite. This layer-stacking approach enhances siloxene properties in many ways, rendering ample opportunities for the development of new siloxene-based composite materials with novel functionalities.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A new siloxene-reduced graphene oxide (RGO) composite was synthesized by a layer-by-layer approach. </LI> <LI> The assembly of siloxene and graphene oxide sheets was reduced at low temperature by solid hydrazine. </LI> <LI> The siloxene-RGO composite has a layered structure that is alternately stacked in a face-to-face fashion. </LI> <LI> The photocurrent density produced by the composite is about 40 times higher than that of siloxene sheets alone. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>A visible-light-sensitive layered siloxene-RGO composite was synthesized by the low-temperature reduction of a siloxene-GO composite with solid hydrazine.</P> <P>[DISPLAY OMISSION]</P>
Kang, Jung Ae,Kim, Hye Rim,Yoon, Sunhye,Nam, You Ree,Park, Sang Hyun,Go, Kyung-Chan,Yang, Gwang-Wung,Rho, Young-Hwan,Park, Hyo-Suk,Jang, Beom Su The Korean Association for Radiation Protection 2016 방사선방어학회지 Vol.41 No.3
Background: Ionizing radiation causes cellular damage and death through the direct damage and/or indirectly the production of ROS, which induces oxidative stress. This study was designed to evaluate the in vivo radioprotective effects of a bio-active material coated fabric (BMCF) against ${\gamma}$-irradiation-induced cellular damage in Sprague-Dawley (SD) rats. Materials and Methods: Healthy male SD rats wore bio-active material coated (concentrations in 10% and 30%) fabric for 7 days after 3 Gy of ${\gamma}$-irradiation. Radioprotective effects were evaluated by performing various biochemical assays including spleen and thymus index, WBC count, hepatic damage marker enzymes [aspartate transaminase (AST) and alanine transaminase (ALT)] in plasma, liver antioxidant enzymes, and mitochondrial activity in muscle. Results and Discussions: Exposure to ${\gamma}$-irradiation resulted in hepatocellular and immune systemic damage. Gamma-irradiation induced decreases in antioxidant enzymes. However, wearing the BMCF-30% decreased significantly AST and ALT activities in plasma. Furthermore, wearing the BMCF-30% increased SOD (superoxide dismutase) and mitochondrial activity. Conclusion: These results suggest that wearing BMCF offers effective radioprotection against ${\gamma}$-irradiation-induced cellular damage in SD rats.