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Shrestha, Nabeen K.,Bui, Hoa Thi,Yoon, Seog Joon,Patil, Supriya A.,Bathula, Chinna,Lee, Kiyoung,Noh, Yong-Young,Han, Sung-Hwan Elsevier 2019 Journal of electroanalytical chemistry Vol.847 No.-
<P><B>Abstract</B></P> <P>This work reports a facile solution based chemical transformation of thin film of CdCO<SUB>3</SUB> cuboids into Cd-based Prussian blue analogue structured thin film with controlled redox-state by manipulating the anion exchange reaction between the solid film and the aqueous solution of K<SUB>3</SUB>[Fe(CN)<SUB>6</SUB>] at 60°C. The progress of the transformation reaction is monitored <I>via</I> electron microscopy, X-ray difractometry and X-ray photoelectron spectroscopy. Based on the scenario of the reaction progress revealed by these analysis, the CdCO<SUB>3</SUB> cuboids are first found to be transformed into the smaller cuboids of cadmium ferricyanide, which, on further reaction, are transformed into the cadmium ferrocyanide cuboids. Thus, by controlling the redox-state of the Fe-metal center on the frameworks, the electrocatalytic activity of the frameworks on oxygen reduction reaction (ORR) is studied. The electrocatalytically inert CdCO<SUB>3</SUB> cuboids after transformation to the frameworks with Fe<SUP>3+</SUP>-centers demonstrate an enhanced catalytic activity on ORR, while the Fe<SUP>2+</SUP>-centers of the frameworks are found to relegate the catalytic activity, thereby manifesting the redox-sate modulated ORR activity of the frameworks. To the best of the authors' knowledge, this is the first report of this kind on redox-state specific ORR activity.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Conversion of CdCO<SUB>3</SUB> cuboid film into Cd-HCF frameworks <I>via</I> anion exchange </LI> <LI> Controlling reaction time to achieve Fe (III)-or Fe(II)- based Cd-HCF frameworks </LI> <LI> Fe(III) based Cd-HCF frameworks demonstrate electrocatalytic activity towards ORR. </LI> <LI> Fe(II) based Cd-HCF frameworks relegate the ORR catalytic activity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Sang-Hyun Oh,Eui-Seong Hwang,Eun-Seok Choi,Gyu-Dong Park,Jin-Gu Kim,Jin-Yong Seong,Jun-Hee Cho,Keun-Do Ban,Keun-Hwan Noh,Nam-Kyeong Kim,Seaung-Suk Lee,Seok-Won Lee,Seung-Jin Yeom,Soon-Yong Kweon,Suk-K 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
We have investigated the ferroelectric properties of integrated Pt/SrBi2Ta2O9 (SBT)/Pt capacitors with capacitor-level dielectric of boron phosphosilicate glass (BPSG). A signicant reduction of remanent polarization (P-P^) was observed in the SBT capacitor as covered with BPSG lm and the polarization decay depended strongly on top electorde size. Detailed analyses showed the degradation resulted from bismuth loss in the surface region of SBT, which is closely related with the impurites diused from BPSG into SBT layer. The degradation of Pt/SBT/Pt ferroelectric capacitor was successfully prevented by inserting SiO2 layer as a impurity blocking layer between the SBT and the BPSG. Thereby device performances of SBT-based ferroelectric memory were also considerably improved.
(+) - Catechin is a Potent Inhibitor of Intestinal Absorption of Cholesterol in Rats
Sang K. Noh,Sung I. Koo,Yongzhi Jiang 한국식품영양과학회 2003 Preventive Nutrition and Food Science Vol.8 No.1
Catechins exhibit a hypocholesterolemic effect in cholesterol-fed animals. The present study was conducted to examine whether (+)-catechin influences the absorption of cholesterol in rats. Male Sprague-Dawley rats were fed ad libitum an AIN-93G diet containing soybean oil for 5 wk. Rats with lymph cannulae were infused at 3.0 mL/h for 8 h via a duodenal catheter with a lipid emulsion containing radiolabeled cholesterol with or without (+)-catechin. Lymph was collected hourly for 8 h. The enteral infusion of (+)-catechin significantly lowered the lymphatic absorption of (14)^C-cholesterol (21.1±3.6% dose/8 h) compared with controls infused with the lipid emulsion devoid of (+)-catechin (38.2±1.2% dose/8 h). The intestinal absorption of α-tocopherol (24.2±3.0% dose/8 h) also was significantly decreased by (+)-catechin infusion, relative to controls (32.2±2.2% dose/8 h). However, the lymphatic outputs of oleic acid, phospholipid were not affected by enteral (+)-catechin infusion. The results indicate that (+)-catechin has a profound inhibitory effect on the intestinal absorption of cholesterol, α-tocopherol without affecting the absorption of fat.
(+)-Catechin is a Potent Inhibitor of Intestinal Absorption of Cholesterol in Rats
Noh, Sang K.,Koo, Sung I.,Jiang, Yongzhi The Korean Society of Food Science and Nutrition 2003 Preventive Nutrition and Food Science Vol.8 No.1
Catechins exhibit a hypocholesterolemic effect in cholesterol-fed animals. The present study was conducted to examine whether (+)-catechin influences the absorption of cholesterol in rats. Male Sprague-Dawley rats were fed ad libitum an AIN-93G diet containing soybean oil for 5 wk. Rats with lymph cannulae were infused at 3.0 mL/h for 8 h via a duodenal catheter with a lipid emulsion containing radiolabeled cholesterol with or without (+)-catechin. Lymph was collected hourly for 8 h. The enteral infusion of (+)-catechin significantly lowered the lymphatic absorption of $^{14}$ C-cholesterol (21.1 $\pm$ 3.6% dose/B h) compared with controls infused with the lipid emulsion devoid of (+)-catechin (38.2 $\pm$ 1.2% dose/8 h). The intestinal absorption of $\alpha$-tocopherol (24.2$\pm$3.0% dose/8 h) also was significantly decreased by (+)-catechin infusion, relative to controls (32.2$\pm$2.2% dose/8 h). However, the lymphatic outputs of oleic acid and phospholipid were not affected by enteral (+)-catechin infusion. The results indicate that (+)-catechin has a profound inhibitory effect on the intestinal absorption of cholesterol and $\alpha$-tocopherol without affecting the absorption of fat.