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Reddy, Venu,Satish Babu, K.K.C.,Torati, Sri Ramulu,Eom, Yun Ji,Trung, Tran Quang,Lee, Nae-Eung,Kim, CheolGi Elsevier 2018 Journal of industrial and engineering chemistry Vol.63 No.-
<P><B>Abstract</B></P> <P>The development of environmentally benign, low-processing and low-cost approaches to the large-scale preparation of advanced nanomaterials based on the use of biological materials is currently attracting great interest. Here, we report the discovery that aqueous honey solutions reduce graphene oxide in a low-cost and an eco-friendly manner, yielding highly water dispersive functionalized reduced graphene sheets. The roles of honey in the reduction of graphene oxide of as-prepared graphene are demonstrated. The possible mechanism for the de-epoxidation of graphene oxide is elucidated. The fabricated a honey-reduced graphene oxide-based field-effect transistor exhibited ambipolar transfer characteristics, thereby demonstrating that the developed material may therefore have applications in electronic devices and sensors.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Venu Reddy,K.K.C. Satish Babu,Sri Ramulu Torati,엄윤지,TranQuangTrung,이내응,김철기 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.63 No.-
The development of environmentally benign, low-processing and low-cost approaches to the large-scale preparation of advanced nanomaterials based on the use of biological materials is currently attracting great interest. Here, we report the discovery that aqueous honey solutions reduce graphene oxide in a low-cost and an eco-friendly manner, yielding highly water dispersive functionalized reduced graphene sheets. The roles of honey in the reduction of graphene oxide of as-prepared graphene are demonstrated. The possible mechanism for the de-epoxidation of graphene oxide is elucidated. The fabricated a honey-reduced graphene oxide-based field-effect transistor exhibited ambipolar transfer characteristics, thereby demonstrating that the developed material may therefore have applications in electronic devices and sensors.
Reddy, Venu,Torati, Ramulu Sri,Oh, Sunjong,Kim, CheolGi American Chemical Society 2013 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.52 No.2
<P>We have presented a biological and eco-friendly method for the synthesis of gold nanoparticles from gold precursor (HAuCl<SUB>4</SUB>) using <I>Sapindus mukorossi</I> Gaertn. fruit pericarp (soapnut shells). We investigate the production of gold nanoparticles as a function of the concentration of HAuCl<SUB>4</SUB> and the amount of soapnut shells. Average nanoparticle sizes of 9, 17, and 19 nm were obtained by using the HAuCl<SUB>4</SUB> concentrations of 1, 5, and 10 mM, respectively, with a fixed amount of soapnut shells extract. The resulted gold nanoparticles are highly crystalline face-centered cubic (fcc) structures. FT–IR analysis suggests that the obtained gold nanoparticles might be stabilized through the interactions of carboxylic groups in the saponins and the carbonyl groups in the flavonoids present in the soapnut shells. These soapnut shells mediated gold nanoparticles were demonstrated to have good catalytic activity for the chemical reduction of <I>p</I>-nitroaniline.</P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ie302037c'>ACS Electronic Supporting Info</A></P>
Hepatic Fibrosis and Steatosis in Metabolic Syndrome
Venu Gopala Reddy Gangireddy,Courtney Pilkerton,Jun Xiang,Ruben Tinajero,Amie M. Ashcraft 대한비만학회 2022 The Korean journal of obesity Vol.31 No.1
Background: Metabolic syndrome (MetS) is a group of factors associated with increased risks of cardiovascular disease and overall mortality. Nonalcoholic fatty liver disease (NAFLD) is a common disorder that has been shown to cause hepatic steatosis and fibrosis. The relationship between NAFLD and MetS appears to be bidirectional, but very few studies have examined the role of MetS in hepatic steatosis and fibrosis. The present study investigated the relationships between MetS and its components and the severity of hepatic fibrosis and steatosis, and fibrosis independent of steatosis. Methods: The study was a cross-sectional population-based survey of 4,678 National Health and Nutrition Examination Survey participants from 2017 to 2018 in the United States. Hepatic fibrosis and steatosis were measured using liver elastography. The MetS components were assessed using demographic, examination, laboratory, and self-reported data. Results: Using survey-weighted population estimates, 26% of the population had steatosis, 7.5% had fibrosis, and 3.3% had fibrosis without steatosis. The adjusted odds ratio for any level of steatosis was 4.12 times higher (95% confidence interval [CI], 3.16–5.37) and any level of fibrosis was 3.34 times higher (95% CI, 2.26–4.94) among participants with MetS than those without. The adjusted odds ratio for fibrosis without steatosis is 2.67 times higher (95% CI, 1.47–4.87) among participants with MetS than those without. Conclusion: The presence of MetS significantly increases the risk of hepatic fibrosis and steatosis, providing evidence for MetS to be considered an additional independent risk factor for hepatic fibrosis together with other known etiologies.
Single Magnetic Bead Detection in a Microfluidic Chip Using Planar Hall Effect Sensor
Hyuntai Kim,Venu Reddy,Kun Woo Kim,Ilgyo Jeong,Xing Hao Hu,CheolGi Kim 한국자기학회 2014 Journal of Magnetics Vol.19 No.1
In this study, we fabricate an integrated microfluidic chip with a planar Hall effect (PHE) sensor for single magnetic bead detection. The PHE sensor was constructed with a junction size of 10 μm × 10 μm using a trilayer structure of Ta(3 nm)/NiFe(10 nm)/Cu(1.2 nm)/IrMn(10 nm)/Ta(3 nm). The sensitivity of the PHE sensor was 19.86 μV/Oe. A diameter of 8.18 μm magnetic beads was used, of which the saturation magnetization was ~2.1 emu/g. The magnetic susceptibility χ of these magnetic beads was calculated to be~0.14. The diluted magnetic beads solution was introduced to the microfluidic channel attributing a single bead flow and simultaneously the PHE sensor voltage was measured to be 0.35 μV. The integrated microchip was able to detect a magnetic moment of 1.98 × 10<SUP>?10</SUP> emu.
Sada Venkateswarlu,Manthrapudi Venu,Yenegu Veera Manohara Reddy,Bathinapatla Sravani,코두루말리카주나,윤민영,G. Madhavi 대한화학회 2019 Bulletin of the Korean Chemical Society Vol.40 No.6
A carbon paste electrode (CPE)/Cu nanowire (Cu NW)/poly(1-ethyl-3-methylimidazolium methyl sulfate) based sensor was successfully fabricated by the electro-polymerization of 1-ethyl-3-methylimidazolium methyl sulfate (EMIMS) onto the surface of Cu nanowires-modified carbon paste electrode. The morphology and chemical nature of Cu NWs were characterized by FTIR, FE-SEM, TEM, XRD techniques. The CPE/CuNWs/poly(EMIMS) showed an electrocatalytic activity toward the determination of etilefrine hydrochloride (ET-HCl) in the 0.11?M buffer solution of phosphate at pH 7.0. The CPE/CuNWs/poly(EMIMS) showed an excellent limit of detection (LOD) 2.3 ?M over the linear dynamic range of 0.1 to 1.3 ?M. The prepared CPE/CuNWs/poly(EMIMS) has exhibited high stability, good sensitivity, and low detection limit for the determination of ET-HCl. The validity of this advanced method was checked by applying in the blood plasma samples, with satisfactory results. This novel CPE/CuNWs/poly(EMIMS) can be an attractive material for the applications in biomedical and sensor fields.
Protein immobilization onto electrochemically synthesized CoFe nanowires
Torati, Sri Ramulu,Reddy, Venu,Yoon, Seok Soo,Kim, CheolGi Dove Medical Press 2015 INTERNATIONAL JOURNAL OF NANOMEDICINE Vol.10 No.-
<P>CoFe nanowires have been synthesized by the electrodeposition technique into the pores of a polycarbonate membrane with a nominal pore diameter of 50 nm, and the composition of CoFe nanowires varying by changing the source concentration of iron. The synthesized nanowire surfaces were functionalized with amine groups by treatment with aminopropyltriethoxysilane (APTES) linker, and then conjugated with streptavidin-Cy3 protein via ethyl (dimethylaminopropyl) carbodiimide and <I>N</I>-hydroxysuccinimide coupling chemistry. The oxide surface of CoFe nanowire is easily modified with aminopropyltriethoxysilane to form an amine terminating group, which is covalently bonded to streptavidin-Cy3 protein. The physicochemical properties of the nanowires were analyzed through different characterization techniques such as scanning electron microscope, energy dispersive spectroscopy, and vibrating sample magnetometer. Fluorescence microscopic studies and Fourier transform infrared studies confirmed the immobilization of protein on the nanowire surface. In addition, the transmission electron microscope analysis reveals the thin protein layer which is around 12–15 nm on the nanowire surfaces.</P>