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An overview and experimental analysis of WO3/TiO2 composite with enhanced electrochromic properties for smart windows application

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Tungsten 2024年第4期6卷 732-747页

作者： ayesha khan.mayur a.gaikwad Jin Hyeok Kim Anamika Kadam The Institute of Science Dr.Homi Bhabha State University Optoelectronics Convergence Research Center and Department of Materials Science and Engineering Chonnam National University

Internationally,standards for electrochromic（EC） requirements in smart window applications have been established,with ongoing global initiatives aimed at elevating them to highly advanced *** paper covers a comprehensive investigation of the structural,optical,morphological,and electrochemical properties of WO3/TiO2composite ***,an experimental analysis of WO3/TiO2was envisaged by a two-step ***,WO3thin films were hydrothermally deposited onto indium-doped tin oxide-coated glass substrates using an aqueous solution of Na2WO4·2H2O at a pH value of ***,a layer of TiO2was electrodeposited onto the WO3thin films.X-ray diffraction analysis confirmed the successful formation of WO3/TiO2composite films,with the WO3phase exhibiting a hexagonal tunnel *** electron microscopy revealed the formation of porous nanorods（NRs） of WO3,uniformly coated with TiO2,resulting in a porous morphology of the WO./*** EC performance of the WO3/TiO2films was thoroughly assessed through cyclic voltammetry and chronoamperometry measurements over a potential window ranging from-2.0 to+1.2 V（versus Ag/AgCl） in a 0.5 mol·L-1LiClO4-PC *** WO3/TiO2composite films exhibited cathodic electrochromism,characterized by a reversible color change from dark blue to *** improved EC performance in comparison to pure WO3films is attributed to enhanced double ion/electron insertion and extraction ***,the WO3/TiO2composite films demonstrated excellent optical modulation properties,with a significant modulation at 633 nm（46.87%）.The coloration efficiency reached a high value of 193.25 cm2·C-1,indicating their potential for practical EC ***,the WO3/TiO2composite films displayed exceptional EC stability,with no significant degradation observed over 2500 cyclic voltammetry *** superior EC performance can be attributed to the synergistic effect between the hexagonal WO3NRs

关键词： Electrochromism Smart window Stability WO3/TiO2

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Geochemistry of volcanic glass from Mahanadi offshore region,eastern continental margin of India:Constraints on the contribution of latest Toba super-eruption

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Acta Oceanologica Sinica 2024年第2期43卷 111-119页

作者： Muralidhar Kocherla Durbar Ray Manavalan Satyanarayanan Hilda Joao Virsen gaikwad PB Ramamurty CSIR-National Institute of Oceanography Dona Paula 403004GoaIndia CSIR-National Geophysical Research Institute Uppal RoadHyderabad 500007India

The tephra layers in multiple sediment cores from the offshore region of the Mahanadi basin in the northern Bay of Bengal were investigated for possible volcanic sources. The glass shards from those tephra layers were studied for size distribution, texture, and elemental geochemistry to establish chronostratigraphic markers for regional and global Quaternary correlation. The textural features of fine-grained(silty) volcanic glasses suggest the distal source of these tephra deposits. Major element composition with elevated SiO_(2) contents ranging between75%–76% and dominance of K_(2)O(> 4.5%) over CaO(< 0.9%) suggest ashes have originated from siliceous rhyolitic melts, similar to the petrographic composition of tephra from the Toba volcano. The bulk trace element compositions of the same glass shards were comparable with those reported in the youngest Toba tephra reported elsewhere. Likewise, the LREE-dominated chondrite normalized REE profiles of tephra from the Mahanadi basin closely resemble the characteristic REE patterns in Toba ash from other parts of the Indian Ocean and thus confirmed the contribution of the youngest Toba super-eruption for this ash layers.

关键词： Mahanadi basin Bay of Bengal volcanic glass glass morphology glass-chemistry

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Effect of interface on mid-infrared photothermal response of MoS2 thin film grown by pulsed laser deposition

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Nano Research 2017年第10期10卷 3571-3584页

作者： Ankur Goswami Priyesh Dhandaria Soupitak Pal Ryan McGee Faheem khan Zeljka Antic Ravi gaikwad Kovur Prashanthi Thomas Thundat Department of Chemical and Materials Engineering University of Alberta Edmonton T6G 1H9 Canada Department of Chemical Engineering University of California Santa Barbara 93106-5070 USA

This study reports on the mid-infrared （mid-IR） photothermal response of multilayer MoS2 thin films grown on crystalline （p-type silicon and c-axis- oriented single crystal sapphire） and amorphous （Si/SiO2 and Si/SiN） substrates by pulsed laser deposition （PLD）. The photothermal response of the MoS2 films is measured as the changes in the resistance of the MoS2 films when irradiated with a mid-IR （7 to 8.2 μm） source. We show that enhancing the temperature coefficient of resistance （TCR） of the MoS2 thin films is possible by controlling the film-substrate interface through a proper choice of substrate and growth conditions. The thin films grown by PLD are characterized using X-ray diffraction, Raman, atomic force microscopy, X-ray photoelectron microscopy, and transmission electron microscopy. The high-resolution transmission electron microscopy （HRTEM） images show that the MoS2 films grow on sapphire substrates in a layer-by-layer manner with misfit dislocations. The layer growth morphology is disrupted when the films are grown on substrates with a diamond cubic structure （e.g., silicon） because of twin growth formation. The growth morphology on amorphous substrates, such as Si/SiO2 or Si/SiN, is very different. The PLD-grown MoS2 films on silicon show higher TCR （-2.9% K^-1 at 296 K）, higher mid-IR sensitivity （△R/R = 5.2%）, and higher responsivity （8.7 V·W^-1） compared to both the PLD-grown films on other substrates and the mechanically exfoliated MoS2 flakes transferred to different substrates.

关键词： MoS2 pulsed laser deposition phototherrnal effect infrared (IR) detector interface

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Transport of yttrium metal ions through fibers supported liquid membrane solvent extraction

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Journal of Rare Earths 2010年第1期28卷 1-6页

作者： A.G.gaikwad A.M.Rajput CE & PD Division National Chemical Laboratory

A novel idea of transport of yttrium(Ⅲ) metal ions through fibers supported liquid membrane in two stage processes namely source to membrane and membrane to receiving phase has been *** fibers supported liquid membrane was impregnated with different concentrations *** experimental variables explored were concentration of yttrium(Ⅲ) ions,pH of source phase,PC-88A concentration in membrane phase,acid concentration in receiving phase and stirring *** pre-concentration of yttrium(Ⅲ) ions ...

关键词： fibers supported liquid membrane solvent extraction yttrium metal ion channel extraction stripping PC-88A rare earths

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The biological clock: future of neurological disorders therapy

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Neural Regeneration Research 2018年第3期13卷 567-568页

作者： Sagar gaikwad Institute of Life Sciences NALCO Square

Dear editors, The seminal, discoveries by Jeffrey Connor Hall, Michael Rosbash and Michael Warren Young have earned the Nobel Prize in Physiology and Medicine 2017 for revealing a crucial physiological mechanism explaining biological clock, with important implications for human health and diseases. The work explains the interplay between the biological clock, the transcriptional feedback loop, and neuroscience, where they identified genes and proteins that work together both in humans and other animals. This article describes the link between biological clock disruption and consequent neurodegeneration and also highlights the significance of biological clock modulators for possible clinical interventions in neurological disorders.

关键词： The biological clock future of neurological disorders therapy

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In-situ probing of thermal desorption of vapor molecules on a nanowire via work function variance

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Nano Research 2016年第11期9卷 3334-3345页

作者： Kovur Prashanthi John Eric Hawk Ryan McGee Ravi gaikwad Thomas Thundat Ingenuity Lab Department of Chemical and Materials Engineering University of Alberta Edmonton AB T6G 2V4 Canada

Nanowire sensors based on variations of their electrical properties show great potential for real-time, in situ monitoring of molecular adsorption and desorption. Although the molecular adsorption-induced change in the electronic work function is very sensitive, it does not have any specificity. However, the temperature dependency of the adsorption-induced work function variation can provide limited selectivity based on the desorption temperature. In this study, we report the in situ probing of molecular desorption by monitoring the work function variations of a single Pt nanowire as a function of temperature. The work function of a clean Pt nanowire shows a significant variation due to vapor adsorption at room temperature. Increasing the temperature of the nanowire results in a variation of the work function due to molecular desorption. Experimentally measured differential work function as a function of temperature shows desorption peaks at 36 and 44 ℃ for methanol and ethanol molecules respectively. Adsorption-induced variation of the Pt nanowire work function was further confirmed using ultraviolet photoelectron spectroscopy before and after exposure to methanol vapor. These results show that the molecular adsorption/desorption-induced variation of the work function and its temperature dependency can be used for developing nanoscale electro-calorimetric sensors.

关键词： Kelvin probe microscopy nanowires thermal desorption work function

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Ultrasound assisted multicomponent reactions:A green method for the synthesis of N-substituted 1,8-dioxo-decahydroacridines usingβ-cyclodextrin as a supramolecular reusable catalyst in water

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Chinese Journal of Catalysis 2016年第1期37卷 146-152页

作者： asha v.chate umesh b.rathod jagdish s.kshirsagar pradip a.gaikwad kishor d.mane pravin s.mahajan mukesh d.nikam charansingh h.gill 巴巴萨海布·安贝卡马拉特瓦达大学化学系印度奥兰加巴德431004

We demonstrate a superficial method for the synthesis of N-substituted 1,8-dioxo-decahydroacridines using β-cyclodextrin as a supramolecular,biodegradable,and reusable catalyst in aqueous *** reaction product is in excellent yield with moderate to excellent *** mechanistic transformation presumably proceeds via a one-pot,multicomponent cyclization of dimedone in the presence of aromatic aldehydes and aromatic amines/INH,undergoing a tandem Michael addition *** proposed approach in this study provides a highly efficient and environmentally benign route to N-substituted 1,8-dioxo-decahydroacridines.

关键词： Tandem reaction N-Substituted 1,8-dioxo-decahydroacridines β-Cyclodextrin Supramolecular catalysis Water

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Transport of Indium, Gallium and Thallium Metal Ions Through Chromatographic Fiber Supported Solid Membrane in Acetylacetone Containing Mixed Solvents

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Chinese Journal of Chemical Engineering 2011年第6期19卷 955-963页

作者： Abaji gaikwad Chemical Engineering and Process Development Division National Chemical Laboratory Pune 411008 India

The transport of metal ions of indium, gallium and thallium from source solution to receiving phase through the chromatographic fiber supported solid membrane in the acetylacetone （HAA） containing mixed solvent system has been explored. The fibers supported solid membranes were prepared with chemical synthesis from cellulose fibers and citric acid with the carboxylic acid ion exchange groups introduced. The experimental variables, such as concentration of metal ions （10^-2 to 10^-4 mol.L^-1） in the source solution, mixed solvent composition [for exampl, e, acetylacetone, （2,4-pentanedione）, （HAA） 20% （by volume）, 1,4-dioxane 10% to 60% and HC1 0.25 to 2 mol.L^-1] in the receiving phase and stirring speed （50-130 *** ） of the bulk source and receiving phase, were explored. The efficiency of mixed solvents for the transport of metal ions from the source to receiving phase through the fiber supported solid membrane was evaluated. The combined ion exchange solvent extraction （CIESE） was observed effective for the selective transport of thallium, indium and gallium metal ions through fiber supported solid membrane in mixed solvents. The oxonium salt formation in the receiving phase enhances thallium, indium and gallium metal ion transport through solid membrane phase. The selective transport of thallium metal ions from source phase was observed from indium and gallium metal ions in the presence of hydrochloric acid in organic solvents in receiving phase. The separation of thallium metal ions from the binary mixtures of Be（II）, Ti（IV）, AI（III） Ca（II）, Mg（II）, K （I）, La（III） and Y（III） was carried out in the mixed solvent system using cellulose fiber supported solid membrane.

关键词： metal ions transfer fiber supported solid membrane acetylacetone extraction stripping

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Toll-like receptor-4 antagonism mediates benefits during neuroinflammation

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Neural Regeneration Research 2016年第4期11卷 552-553页

作者： Sagar gaikwad Challagundla Naveen Reena Agrawal-Rajput Laboratory of Immunology School of Biological Sciences and BiotechnologyIndian Institute of Advanced Research

Neuroinflammation following immune activation in the central nervous system（CNS）leads to neuronal loss in specific areas of the CNS resulting in neurodegenerative ***,fine tuning the immune responses within the brai... 详细信息

关键词： neuronal tuning inflammation benefits aberrant microglia inappropriate cytokines bidirectional sepsis

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Capture of carbon dioxide over porous solid adsorbents lithium silicate, lithium aluminate and magnesium aluminate at pre-combustion temperatures

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Frontiers of Chemical Science and Engineering 2011年第2期5卷 215-226页

作者： P.V.Korake A.G.gaikwad CE&PD Division National Chemical LaboratoryPune 411008India

The capturing process for carbon dioxide over porous solid adsorbents such as lithium silicate,lithium aluminate,and magnesium aluminate at pre-combustion temperatures was *** silicate was prepared by the sol gel and solid fusion *** lithium silicate adsorbent was characterized by X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),scanning elec-tron microscopy(SEM),nuclear magnetic resonance(NMR),and surface *** capturing of carbon dioxide over lithium silicate,lithium aluminate,and magnesium aluminate was explored at different experimental condi-tions such as exposure time,temperature variation,and exposure carbon dioxide *** capturing process for carbon dioxide was investigated over these adsorbents with variation of their metal mole *** effect of the addition of(promoter)sodium,potassium,and cesium in the lithium silicate adsorbent was explored to investigate the variation of the capture of carbon dioxide over these adsorbents.

关键词： capturing CO_(2) lithium silicate lithium alu-minate magnesium aluminate

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