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Sivaranjani, K.,Rakkiyappan, R.,Joo, Young Hoon Elsevier 2018 Journal of the Franklin Institute Vol.355 No.8
<P><B>Abstract</B></P> <P>This paper focuses on the synchronization problem of semi-Markovian jumping complex dynamical networks with time-varying coupling delays against actuator failures. In an aim to shrink the treatment of network resources event triggered control strategy is proposed to achieve the synchronization criteria. By constructing Lyapunov–Krasovski functional, some delay dependent criteria that assures the synchronization of CDN are derived with the help of the general integral inequalities. It should be noted that the general integral inequality used here is general than that of Jensen inequality, the Wirtinger-based inequality, the Bessel-Legendre inequality, the Wirtinger-based double integral inequality, and the auxiliary function-based integral inequalities. The resulting LMIs can be easily verified with the help of the available softwares. Finally, simulation results are proposed to verify the effectiveness of the general integral inequality and designed control law.</P>
P.R. Sivaranjani,Asad Syed,Abdallah M. Elgorban,Ali H. Bahkali,R. Balakrishnaraja,Rajender S. Varma,S. Sudheer Khan 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.118 No.-
The current study offers the design of a novel photocatalyst for the effective removal of pharmaceuticalswherein the heterojunction was constructed with the objective of capturing maximum solar spectrumand to ensure effective separation of photogenerated charge carriers. The nano-heterojunction was fabricatedthrough ultrasonication-assisted co-precipitation method by the hierarchical deposition of a-Fe2O3 and b-La2S3 on cubic CoCr2O4 spinel. The fabricated nanomaterials were extensively characterizedby using XRD, Raman, FTIR, XPS, SEM, TEM, EDAX, PL, EIS, BET, and DRS. The photoluminescence and EISanalysis revealed the mitigated charge carrier recombination in CoCr2O4/a-Fe2O3/b-La2S3 (CFL) thatresulted in superior photodegradation of doxycycline (DOX) (92.83 %) under visible light irradiation. Mineralization percentage of 92.5 % was affirmed by TOC analysis. Further, the influence of pH, ions, concentrationof DOX and CFL dosage on the photodegradation process was studied. The active participationof the reactive species involved in the reaction were identified by scavenging assay and ESR. Finally, apossible photocatalytic mechanism of CFL for the degradation of DOX with underlying pathway is proposedwith the help of GC–MS/MS analysis. The study highlights the great promise of CFL photocatalystas well as the potential of n-n-p heterojunction for appliances in the photodegradation of organicpollutants.
Bhardwaj, Jyoti,Devarakonda, Sivaranjani,Kumar, Suveen,Jang, Jaesung Elsevier Sequoia 2017 Sensors and actuators. B Chemical Vol.253 No.-
<P><B>Abstract</B></P> <P>The need for low-cost, sensitive, and reliable sensors for the detection of whole bacterial cells in food samples without pre-treatment has been increasing. Outbreaks of foodborne diseases can be severe, especially in developing countries; however, most bio-detection tools are unaffordable. Here, we have developed a rapid and low-cost paper-based electrochemical immunosensor for label-free detection of <I>Staphylococcus aureus</I>, using antibody (Ab)-single walled carbon nanotube (SWCNT) bio-conjugates. Anti-<I>S. aureus</I> antibodies were covalently attached onto the SWCNTs, using the <I>N</I>-(3-dimethylaminopropyl)-<I>N</I>’-ethylcarbodiimide hydrochloride/<I>N</I>-hydroxysuccinimide coupling reagent. These Ab-SWCNT bio-conjugates were then immobilized on the working electrode, and the presence of <I>S. aureus</I> was detected by analyzing the change in peak current following antigen-antibody complex formation. Differential pulse voltammetry was performed with a bacterial concentration ranging from 10 to 10<SUP>7</SUP> colony forming units (CFU) mL<SUP>−1</SUP>. A selectivity assay using <I>Escherichia coli</I> B<I>, Bacillus subtilis</I>, and <I>S. epidermidis</I> (to examine cross-reactivity) showed that the sensor was specific to <I>S. aureus.</I> Moreover, this immunosensor showed a good linear relationship (R<SUP>2</SUP> =0.976) between the increase in peak current and logarithmic <I>S. aureus</I> concentration, with a rapid detection time (30min) and a limit of detection of 13CFUmL<SUP>−1</SUP> in spiked milk samples. This low-cost immunosensor can be used for rapid detection of pathogens in actual food samples with high sensitivity and specificity.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A sensitive paper based electrochemical sensor for label-free detection of bacteria in food samples is presented. </LI> <LI> Ab-SWCNT conjugate was used to decrease the functionalization steps and increase the robustness of the immunosensors. </LI> <LI> A detection limit of 13 CFUmL-1 in spiked milk samples was obtained with rapid detection time (∼30min). </LI> <LI> A highly linear behavior and high specificity were observed. </LI> </UL> </P>
LIZHENGHUA,Heon Jong Jeong,Kumarsrinivasan Sivaranjani,Byung Jin Song,Su Bin Park,Donghao Li,Chul Wee Lee,Mingshi Jin,김지만 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.5
Highly ordered mesoporous tungsten trioxide (WO3) with high surface area (75 m2/g) and well-defined mesopores were successfully prepared through a hard templating method using a meso-porous silica KIT-6 as a template and (NH4)6H2W12O40 · xH2O as a tungsten precursor. Oxidative desulfurization of a model oil with H2O2 as the oxidant was carried out at 50℃ under atmospheric pressure in order to analyze the catalytic activity. The desulfurization reactions were optimized by various kinds of reaction parameters such as H2O2/S molar ratio, reaction temperatures and series of sulfur-containing compounds [dibenzothiophene (DBT), benzothiophene (BT) and 4,6-dimethyl dibenzothiophene (4,6-DMBT)]. Excellent catalytic activity for the removal of the sulfur-containing compounds from the model oil was observed with mesoporous WO3 catalyst, where the activity was maintained during 5 recycle tests without any regeneration process. The high catalytic activity and durability is mainly attributed to well-defined mesopores and high surface area of mesoporous WO3 catalyst.
Li, Chengbin,Oh, Hwa-Yong,Cho, Hye-Jin,Kumarsrininasan, Sivaranjani,Choi, Jong-Ha,Li, Zhenghua,Hong, Gyoung-Hee,Park, Su-Bin,Kim, Ji Man American Scientific Publishers 2016 Journal of nanoscience and nanotechnology Vol.16 No.11
<P>Binary oxide catalyst (Cu0.15Co2.84O4) supported on mesoporous CeO2 has been prepared by an incipient wetness impregnation method. The produced catalysts with different loading of binary oxide (0-30 wt%) have been thoroughly characterized and applied for a water-gas shift (WGS) reaction. The characterization results indicate that the binary oxide catalysts are highly dispersed on the mesoporous CeO2 support without significant loss of mesostructural properties, even though the catalyst loading reaches 30 wt%. The highest catalytic activity towards WGS reaction has been achieved from the 30 wt% Cu0.15Co2.84O4/CeO2 catalyst, showing 100% CO conversion and very low methane yield (nearly zero%) at relatively low temperature (similar to 300 degrees C). The present Cu0.15Co2.84O4/CeO2 catalyst can be recycled more than three times with loss of the activity. Metallic cobalt species are formed during the reaction, whose structural properties are maintained under the repeated WGS reaction conditions. Excellent catalytic activity and durability originate from the highly dispersed binary oxides on the pore surface of mesoporous CeO2, which is probably due to the strong metal-support interaction.</P>
Synthesis and Characterization of In2O3Nanoparticles
A. Ayeshamariam,M. Kashif,S. Muthu Raja,S. Sivaranjani,C. SANJEEVIRAJA,M. Bououdina 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.2
Metal-oxide nanostructures have elicited increasing interest in both fundamental and appliedsciences. Among metal oxide nanostructures, In2O3 has the potential for use asa semiconductormaterial. This article provides details on studies carried out thus far for the synthesis and thecharacterization of In2O3 nanostructures. In this research, various techniques were investigatedfor the fabrication of diverse and fascinating spherical shaped In2O3 nanostructures. Brunauer-Emmett-Teller (BET) analyses of the In2O3 nanostructures through detailed refinements of thestructure of the In2O3 nanoparticles by using the Rietveld method, followed by microstructuralanalyses using scanning electron microscopy/ transmission electron microscopy (SEM/TEM) anda chemical composition analysis are presented and discussed. Decreasing crystallinity with animprovement in specific surface area was observed from the structural characterization. The energydispersive analysisresults showed that the as-prepared In2O3 powder sample was stoichiometric,containing almost equal proportions of indium and oxygen. The microstructural analysis (TEM andSEM) demonstrated precise control over the diameters of the nanoparticles, which is an importantadvantage of the solution combustion approach.