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Kannaiyan, Dinakaran,Kim, Eunhye,Won, Nayoun,Kim, Kang Wook,Jang, Yoon Hee,Cha, Min-Ah,Ryu, Du Yeol,Kim, Sungjee,Kim, Dong Ha Royal Society of Chemistry 2010 Journal of materials chemistry Vol.20 No.4
<P>Two-dimensional (2D) arrays of hybrid CdS/TiO<SUB>2</SUB> composite nanodots were fabricated on solid substrates using amphiphilic poly(styrene-<I>block</I>-ethylene oxide) diblock copolymer (PS-<I>b</I>-PEO) micelles as templates loaded with CdS nanoparticles (NPs) and TiO<SUB>2</SUB> sol–gel precursors. The inorganic precursors were selectively incorporated into PEO domains of PS-<I>b</I>-PEO due to the specific interactions. The addition of CdS quantum dots (QDs) into thin films of the PS-<I>b</I>-PEO/TiO<SUB>2</SUB> sol–gel mixture led to the morphological changes from mixed wire/hexagonal dot to well-defined, quasi-hexagonal dot arrays. The PS-<I>b</I>-PEO/TiO<SUB>2</SUB>/CdS system showed an enhanced absorption along with red shift behavior in the UV-visible spectral range compared with the PS-<I>b</I>-PEO/TiO<SUB>2</SUB> films. Photoluminescence (PL) studies showed a quenching of CdS emission in the presence of TiO<SUB>2</SUB>. An enhanced photocatalytic degradation of methylene blue (MB) was observed in the hybrid PS-<I>b</I>-PEO/TiO<SUB>2</SUB>/CdS thin film.</P> <P>Graphic Abstract</P><P>Ultrahigh density arrays of composite CdS/TiO<SUB>2</SUB> nanoparticles with enhanced photocatalytic performance were produced by a cooperative sol–gel chemistry and self-assembly of amphiphilic poly(styrene-<I>block</I>-ethylene oxide) block copolymers. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b917858a'> </P>
Kannaiyan, Dinakaran,Cha, Min-Ah,Jang, Yoon Hee,Sohn, Byeong-Hyeok,Huh, June,Park, Cheolmin,Kim, Dong Ha Royal Society of Chemistry 2009 New journal of chemistry Vol.33 No.12
<P>Well defined, ordered arrays of hybrid Ag/TiO<SUB>2</SUB> hetero nanodots were fabricated on solid substrates using amphiphilic poly(styrene-block-ethylene oxide) diblock copolymer (PS-<I>b</I>-PEO) micelles loaded with AgNO<SUB>3</SUB> and TiO<SUB>2</SUB> sol–gel precursors as templates. The inorganic precursors were selectively incorporated into PEO domains due to specific chemical affinity. The conversion of AgNO<SUB>3</SUB> to metallic Ag was induced by UV irradiation and confirmed by the presence of a surface plasmon band in the UV–vis absorbance spectra. The organic matrix has been removed by deep UV irradiation, leading to arrays of Ag/TiO<SUB>2</SUB> composite nanoparticles (NPs). The morphology and photocatalytic activities of the resulting hybrid nanoparticle arrays were studied. Markedly enhanced photocatalytic degradation of methylene blue has been observed for Ag/TiO<SUB>2</SUB> nanodot arrays compared with pure TiO<SUB>2</SUB> NP arrays.</P> <P>Graphic Abstract</P><P>A facile route to fabricate hybrid TiO<SUB>2</SUB>/Ag nanodot arrays, a promising photocatalytic thin film, utilising cooperative self assembly of a block copolymer and sol–gel precursors is demonstrated. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b9nj00245f'> </P>
Mathi Kannaiyan,Jinu GowthamiThankachi Raghuvaran,Karthikeyan Govindan,Elaya Perumal Annamalai 한양대학교 세라믹연구소 2020 Journal of Ceramic Processing Research Vol.21 No.1
In this present work, an attempt was made on optimising the Resistance Spot Welding (RSW) process parameters for joiningtwo dissimilar combinations of AISI 304 and AISI 1020 grade steel with each other. Experiments were conducted by varyingthe three weld process parameters such as welding current, pressure and welding time. The integrity of the weld joints wasevaluated mechanically and metallurgically. Tensile shear fracture, nugget diameter, and hardness properties were examined. Macrostructure, Microstructure, and Scanning Electron Microscopy (SEM) analysis were carried out on the tested samplesto validate the type of fracture occurred. Maximum nugget diameter and maximum tensile fracture of 6.666 mm and 10.5 kNwere achieved respectively. The experimental results confirmed the validity of the used Response Surface Methodology appliedfor optimising the welding process parameter in the RSW process. The Response Surface Methodology (RSM) results showthat the weld current is the most significant factor for Tensile Shear Fracture Load (TSFL) and nugget diameter, followed byweld pressure and time.
Huang, Song-Jeng,Kannaiyan, Sathiyalingam,Subramani, Murugan Techno-Press 2022 Advances in nano research Vol.13 No.4
In this study, the gravitating mechanical stir casting method was used to fabricating the Nb<sub>2</sub>O<sub>5</sub>/AZ31 magnesium matrix nanocomposites. Niobium pentoxide (Nb<sub>2</sub>O<sub>5</sub>) used as reinforcement with two different weight percentages (3 wt % and 6 wt %). The influence of Nb<sub>2</sub>O<sub>5</sub> on microstructure and mechanical properties has been investigated. The microstructure analysis showed that the composites are mainly composed of the primary α-magnesium phase and phase β-Mg<sub>17</sub>Al<sub>12</sub> secondary phase. The secondary phase was dispersed evenly along the grain boundary of the Mg phase. The Nb<sub>2</sub>O<sub>5</sub>/AZ31 nanocomposites revealed that the grain size and its lamellar shape (β-Mg<sub>17</sub>Al<sub>12</sub>) were gradually refined. Different strengthening mechanisms were assessed in terms of their contributions. Results showed that composite material properties of hardness, yield strength, and fracture study were directly related to Nb<sub>2</sub>O<sub>5</sub> as a reinforcement. The maximum values of the mechanical properties were achieved with the addition of 3 wt% Nb<sub>2</sub>O<sub>5</sub> on the AZ31 alloy.
Cha, Min-Ah,Shin, Changhak,Kannaiyan, Dinakaran,Jang, Yoon Hee,Kochuveedu, Saji Thomas,Ryu, Du Yeol,Kim, Dong Ha Royal Society of Chemistry 2009 Journal of materials chemistry Vol.19 No.39
<P>Hybrid titanium dioxide (TiO<SUB>2</SUB>) nanostructures with engineered morphologies were produced by a simple synthetic approach based on cooperative sol-gel chemistry and self-assembly of amphiphilic poly(styrene-<I>block</I>-ethylene oxide) (PS-<I>b</I>-PEO) block copolymer (BCP) <I>via</I> spin-coating common solutions of BCP and inorganic precursors. TiO<SUB>2</SUB> nanostructures with two extreme reverse morphologies, <I>i.e.</I>, TiO<SUB>2</SUB> dot-in-PS matrix and PS dot-in-TiO<SUB>2</SUB> matrix, were obtained by increasing the volumetric ratio of the TiO<SUB>2</SUB> sol-gel precursor from 10 to 50 vol%. Incorporation of silver nitrate into the TiO<SUB>2</SUB> matrix afforded a hybrid Ag/TiO<SUB>2</SUB> thin film with hexagonally packed arrays of PS nanodots. Upon removal of the PS-<I>b</I>-PEO template from the initial hybrid films by UV treatment, inorganic nanostructures having the same lateral morphologies as the initial films were derived. Among the structures investigated, the Ag/TiO<SUB>2</SUB> mesoporous film exhibited the best photocatalytic performance. The surface/internal morphology and the mechanism of structural evolution were investigated by atomic force microscopy (AFM), transmission electron microscopy (TEM), and grazing-incidence small-angle X-ray scattering (GISAXS).</P> <P>Graphic Abstract</P><P>TiO<SUB>2</SUB> and Ag/TiO<SUB>2</SUB> nanostructures with engineered morphologies and enhanced photocatalytic properties were produced by a cooperative sol-gel chemistry and block copolymer self-assembly. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b907922j'> </P>
Ponnusamy Senthil Kumar,Subramaniam Ramalingam,Kannaiyan Sathishkumar 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.1
Methylene blue dye was adsorbed on an adsorbent prepared from cashew nut shell. A batch adsorption study was carried out with variable adsorbent amount, initial dye concentration, contact time and pH. Studies showed that the pH of aqueous solutions affected dye removal as a result of removal efficiency increased with increasing solution pH. The experimental data were analyzed by the Langmuir, Freundlich, Redlich-Peterson, Koble-Corrigan, Toth, Temkin,Sips and Dubinin-Radushkevich models of adsorption using MATLAB 7.1. The experimental data yielded excellent fits within the following isotherm order: Redlich-Peterson>Toth>Sips>Koble-Corrigan>Langmuir>Temkin>Dubinin-Radushkevich>Freundlich, based on its correlation coefficient values. Three simplified kinetic models including a pseudofirst-order, pseudo-second-order and intraparticle diffusion equations were selected to follow the adsorption process. It was shown that the adsorption of methylene blue could be described by the pseudo-second-order equation. The results indicate that cashew nut shell activated carbon could be employed as a low cost alternative to commercial activated carbon in the removal of dyes from wastewater.
One Pot Synthesis and Characterization of Alginate Stabilized Semiconductor Nanoparticles
Parani Sundarrajan,Prabakaran Eswaran,Alexander Marimuthu,Lakshmi Baddireddi Subhadra,Pandian Kannaiyan 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.10
Uniform and well dispersed metal sulfide semiconductor nanoparticles incorporated into matrices of alginate biopolymer are prepared by using a facile in situ method. The reaction was accomplished by impregnation of alginate with divalent metal ions followed by reaction with thioacetamide. XRD analysis showed that the nanoparticles incorporated in the polymer matrix were of cubic structure with the average particle diameter of 1.8 to 4.8 nm. Field emission scanning electron microscopy and high resolution transmission electron microscopy images indicated that the particles were well dispersed and distributed uniformly in the matrices of alginate polymer. FT-IR spectra confirmed the presence of alginate in the nanocomposite. The crystalline nature and thermal stability of the alginate polymer was found to be influenced by the nature of the divalent metal ions used for the synthesis. The proposed method is considered to be a simple and greener approach for large scale synthesis of uniform sized nanoparticles.