http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Haldorai, Y.,Shim, J.J. North-Holland 2014 Materials letters Vol.116 No.-
This paper reports a facile and residue free synthesis of copper oxide (CuO) nanospindles by the thermal decomposition of a 3D precursor complex, copper benzoate dihydrazinate at 100<SUP>o</SUP>C. Transmission electron microscopy revealed monodispersed nanospindles with a mean diameter of approximately 22nm. X-ray diffraction and selected-area electron diffraction showed that the nanospindles were composed of a pure monoclinic phase of polycrystalline CuO. The nanospindles were also confirmed by Raman spectroscopy. The enhancement of the thermal conductivity of ethylene glycol (EG) in the presence of CuO nanospindles was examined. No surfactant was used as a dispersant. The volume fraction of CuO nanospindles suspended in EG was less than 5vol%. The thermal conductivity of the CuO nanofluids increased with increasing particle loading.
Haldorai, Yuvaraj,Vilian, A.T. Ezhil,Rethinasabapathy, Muruganantham,Huh, Yun Suk,Han, Young-Kyu Elsevier 2017 Sensors and actuators. B, Chemical Vol.247 No.-
<P><B>Abstract</B></P> <P>A composite comprising reduced graphene oxide (RGO) and titanium nitride (TiN) was fabricated via a combined two-step process of sol-gel and ammonia annealing. Transmission electron microscopy showed that TiN nanoparticles with a mean diameter of <10nm were densely decorated onto the RGO surface. Cyclic voltammetry indicated that a glassy carbon electrode (GCE) modified with the RGO–TiN nanocomposite exhibited an excellent electrocatalytic activity toward the oxidation of dopamine in 0.1M phosphate buffer solution (pH=7). The combined use of RGO and TiN resulted in a higher current response and a lower oxidation potential (0.23V) than those of bare GCE, RGO/GCE, and TiN/GCE. In addition, the developed electrochemical sensor showed a linear relationship with the dopamine concentration from 0.1 to 80μM with a limit of detection of 0.012μM (S/N=3). The sensor demonstrated excellent selectivity, good stability, and reproducibility. The sensor was applied to the determination of dopamine in urine samples by the standard addition method and gave recoveries of 97.0–101.5%.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Facile synthesis of RGO-TiN composite. </LI> <LI> Excellent electrocatalytic activity towards the oxidation of DA. </LI> <LI> The low detection limit for DA sensing was identified as 0.012μM. </LI> <LI> The sensor showed a high sensitivity of 35.8μA μM<SUP>−1</SUP> cm<SUP>−2</SUP>. </LI> <LI> Excellent selectivity with good stability and reproducibility of the electrode. </LI> </UL> </P>
Haldorai, Yuvaraj,Yeon, Sun-Hwa,Huh, Yun Suk,Han, Young-Kyu Elsevier 2017 Sensors and actuators. B Chemical Vol.239 No.-
<P><B>Abstract</B></P> <P>A nanocomposite consisting of reduced graphene oxide (rGO) decorated with tin oxide (SnO<SUB>2</SUB>) nanoparticles was fabricated using a hydrothermal route. Cyclic voltammetry showed that a glassy carbon electrode (GCE) modified with the rGO/SnO<SUB>2</SUB> composite exhibited an excellent electrocatalytic activity towards the oxidation of amino acid tryptophan (Trp) in 0.1M phosphate buffer solution (pH=7). The combined use of rGO and SnO<SUB>2</SUB> results in higher current response and lower oxidation potential (0.76V) compared to those of a bare GCE, SnO<SUB>2</SUB>/GCE, and rGO/GCE. Differential pulse voltammetry study showed a linear relationship to the Trp concentration of 1–100μM. The low detection limit of Trp was identified at 0.04μM (S/N=3) with sensitivity of 37.3μAμM<SUP>−1</SUP> cm<SUP>−2</SUP>. The sensor demonstrated an excellent selectivity, good stability, and reproducibility. The sensor was applied to the determination of Trp in spiked milk and amino acid injection samples by the standard addition method and gave recoveries of 98.0–101.3% and 98.1–102.5%, respectively.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hydrothermal synthesis of rGO/SnO<SUB>2</SUB> flower-like nanocomposite. </LI> <LI> Excellent electrocatalytic activity towards the oxidation of tryptophan. </LI> <LI> The low detection limit for tryptophan sensing was identified as 0.04μM (S/N=3). </LI> <LI> The sensor showed a high sensitivity of 37.3μAμM<SUP>−1</SUP> cm<SUP>−2</SUP>. </LI> <LI> Excellent selectivity with good stability and reproducibility of the electrode. </LI> </UL> </P>
Fabrication of [60] Fullerene Grafted Polymer: Self-Assembly Behavior in Polar Solvents
Haldorai, Yuvaraj,Islam, Muhammad Naoshad,Shim, Jae-Jin Chemic Publishing Company 2014 Asian Journal of Chemistry Vol.26 No.2
<P>In of this report we prepared anew type of [60] fullerene grafted poly(2-bromomethyl)acrylic acid. First step was the free-radical polymerization of 2-(bromomethyl)acrylic acid Wing 2,2'-azobisisobutyronitrile. Then:a nucleophilie substitution reaction was performed to substitute the bromine atoms present in the polymer with azide groups Finally the C-60 grafted polymer was prepared by the reaction of azido functionalized polymer with C-60. Results of Fourier transform infrared spectroscopy and ultraviolet visible spectroscopy indicated that the C-60 was Chemically bonded to the polymer, The aggregation behavior of the resulting polymer in polar solvents was studied by transmission electron microscopy. The resultant polymer retained both electronic property of the C-60 moiety and processability property of the polymer.</P>
Chemo-responsive bilayer actuator film: fabrication, characterization and actuator response
Haldorai, Yuvaraj,Shim, Jae-Jin The Royal Society of Chemistry 2014 NEW JOURNAL OF CHEMISTRY Vol.38 No.6
<P>A chemo-responsive bilayer actuator was fabricated by cross-linking a polysaccharide based highly hydrophilic material with the polyamide-6 (PA-6) substrate. The hydrogel material was prepared by grafting the polyacrylamide (PAAm) and poly(acrylic acid) (PAA) copolymer onto carboxymethyl cellulose (CMC) [poly(AA-<I>co</I>-AAm)-<I>g</I>-CMC]. The successful grafting of the copolymer onto CMC was confirmed by Fourier transform infrared spectroscopy and thermogravimetric analysis. The swelling behavior of the poly(AA-<I>co</I>-AAm)-<I>g</I>-CMC hydrogel was examined at a range of pH values and ionic strengths. Fabrication of the bilayer actuator was performed by drop casting a poly(AAm-<I>co</I>-AA)-<I>g</I>-CMC solution onto a PA-6 substrate followed by subsequent cross-linking under ultraviolet radiation. Cross-linking was performed to make the material readily swellable in water but prevent complete dissolution. The actuator response was measured in both water and ethanol.</P> <P>Graphic Abstract</P><P>A bilayer actuator showing fast and stable curling/uncurling motion was prepared by photo-cross-linking poly(AAm-<I>co</I>-AA)-<I>g</I>-CMC onto PA-6. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4nj00014e'> </P>
Haldorai, Y.,Shim, J.J. North-Holland 2014 Materials letters Vol.133 No.-
Reduced graphene oxide (RGO)/zinc oxide (ZnO) composite was synthesized via a simple and environmentally-friendly route using supercritical carbon dioxide. The structure and morphology of the resulting composite was characterized by transmission electron microscopy, X-ray diffraction and Raman spectroscopy. The nanocomposite exhibited enhanced photocatalytic activity for hydrogen (H<SUB>2</SUB>) production from water photo-splitting because the ZnO nanoparticles on the RGO sheets can capture light energy and facilitate excited electron transfer for photocatalytic H<SUB>2</SUB> production via RGO, which acts as an efficient electron mediator.