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- 저자 : Dayakar, T. (검색결과 6 건)
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Dayakar, T.,Venkateswara Rao, K.,Park, Jinsub,Sadasivuni, Kishor Kumar,Ramachandra Rao, K.,Jaya rambabu, N. Elsevier 2018 Materials chemistry and physics Vol.216 No.-
<P><B>Abstract</B></P> <P>An enzyme-free glucose sensor developed based on silver nanoparticles (Ag NPs) via bio-mediated route using <I>Ocimum tenuiflorum</I> leaves extract. The Ag NPs were characterized by X-ray diffraction (XRD), ultraviolet-visible (UV-Vis) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, Particle size analyzer (PSA), Scanning electron microscopy (SEM), Energy-dispersive X-ray (EDAX) spectroscopy, and Transmission electron microscopy (TEM), to study structural, optical and morphological properties. The electrocatalytic activity of Ag NPs towards the oxidation of glucose in the 0.1 M NaOH electrolyte solution was analyzed. The Ag NPs was coated on Glassy carbon electrode (GCE) and reports indicating the outstanding capability such as high sensitivity (895.8 μAmM<SUP>−1</SUP>cm<SUP>−2</SUP>), linear range (1–8.9 mM), response time (<4s), low detection limit (0.0048 μM, S/N = 3), long-term stability, reproducibility, repeatability, and selectivity of the sensor. Therefore, the bio-synthesized Ag NPs can markedly helpful to fabricate non-enzymatic, sustainable, simple, low cost, and eco-friendly glucose monitoring devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ocimum tenuiflorum leaf extract and silver nitrate were used to prepare Ag NPs. </LI> <LI> Structural, optical and morphological properties of Ag NPs were studied. </LI> <LI> The GCE modified with Ag NPs showed a sensitivity of 895.8 μAmM<SUP>−1</SUP>cm<SUP>−2</SUP>. </LI> <LI> Bio-mediated synthesized NPs showed sustainable glucose sensing properties. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Nano and Neutron Science Applications for Geomechanics
Dayakar Penumadu,Amal K. Dutta,Xin Luo,Kenneth G. Thomas 대한토목학회 2009 KSCE Journal of Civil Engineering Vol.13 No.4
Recent advances in experimental characterization techniques offer unique opportunities to evaluate mechanical properties of geomaterials. In this paper, authors introduce two such techniques that have significant potential to impact geomechanics community. The technique of using Instrumented indentation testing using nano-indenter to evaluate hardness and modulus of individual sand particles is introduced. Use of the measured data from nanoindenter on individual sand grain in modelling its assembly using numerical methods such as the discrete element method (for example PFC-2D) is addressed. Modulus for two silica sands with varying particle shape is presented for the depth of indentation in the range of 100 to 1000 nanometers. Use of neutron science for solving relevant problems to geotechnical engineering is also described in this paper. Neutrons are subatomic particles with no electric charge having duality and interacts with atomic nuclei, while X-ray interacts with electrons. Neutrons thus have significantly higher penetration power for most geo-materials when compared to X-rays and are sensitive to hydrogen. Use of neutrons for solving a new class of problems including non-destructive evaluation of strain at particle level while the assemblage is subjected to target stress conditions, and imaging applications including flow through partially saturated porous medium are presented. Recent advances in experimental characterization techniques offer unique opportunities to evaluate mechanical properties of geomaterials. In this paper, authors introduce two such techniques that have significant potential to impact geomechanics community. The technique of using Instrumented indentation testing using nano-indenter to evaluate hardness and modulus of individual sand particles is introduced. Use of the measured data from nanoindenter on individual sand grain in modelling its assembly using numerical methods such as the discrete element method (for example PFC-2D) is addressed. Modulus for two silica sands with varying particle shape is presented for the depth of indentation in the range of 100 to 1000 nanometers. Use of neutron science for solving relevant problems to geotechnical engineering is also described in this paper. Neutrons are subatomic particles with no electric charge having duality and interacts with atomic nuclei, while X-ray interacts with electrons. Neutrons thus have significantly higher penetration power for most geo-materials when compared to X-rays and are sensitive to hydrogen. Use of neutrons for solving a new class of problems including non-destructive evaluation of strain at particle level while the assemblage is subjected to target stress conditions, and imaging applications including flow through partially saturated porous medium are presented.
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Optimization of Infrared Heating Conditions of Sorghum Flour Using Central Composite Design
Indhurathna Swaminathan,Manisha Guha,Umesh Hebbar Hunglur,Dayakar Benhur Rao 한국식품과학회 2015 Food Science and Biotechnology Vol.24 No.5
Storage stability parameters like free fatty acid (FFA) content and lipase activity were evaluated for infrared heated sorghum flour. Infrared heating conditions (temperature and duration) were optimized using a central composite design. Processing at a temperature of 120℃ for 8.5 min was optimum to provide the lowest FFA content (0.03%), lipase activity (15 μeq·mg/h), and peak viscosity (318 BU). Correlation coefficient values (R2) for responses of FFA content (96.24%), lipase activity (97.74%), and peak viscosity (90.87%), derived using experimental data, indicated that the model was a good fit. Infrared heating at 120℃ for 8.5 min can be useful for development of shelf stable sorghum flour.
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Yang, Taeyoung,Shin, Dong Su,Yu, Jiyeon,Ji, Yuexing,Kim, Taek Gon,Dayakar, T,Park, Jinsub Institute of Physics 2018 Semiconductor science and technology Vol.33 No.12
<P>In this paper, we report on an ultraviolet (UV) photodetector based on a pn junction structure hollow anatase n-TiO<SUB>2</SUB> nanosphere monolayer film on a p-GaN template. In order to form and transfer the well-arrayed hollow TiO<SUB>2</SUB> nanosphere monolayer film onto polydimethylsiloxane (PDMS), a facile rubbing method and polyvinyl alcohol (PVA) aqueous solution was used. To investigate the effects of different-sized hollow TiO<SUB>2</SUB> nanospheres, anatase-TiO<SUB>2</SUB> spheres of various diameters were prepared by combining template synthesis and thermal treatment. The responsiveness of the fabricated UV photodetectors using anatase n-TiO<SUB>2</SUB> monolayer/p-GaN was increased from 0.17 to 0.21 A W<SUP>−1</SUP> upon reducing the size of the anatase-phased hollow n-TiO<SUB>2</SUB> spheres from 660 to 360 nm. Our suggested transferable anatase-TiO<SUB>2</SUB> monolayer film is a new n-type single-layer material for electronic and optical device fields developed through the universal usage of displaceable material for targeted hetero-templates.</P>
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