Hydrophilic polyaniline nanofibrous architecture using electrosynthesis method for supercapacitor application

D.S. Dhawale,R.R. Salunkhe,V.S. Jamadade,D.P. Dubal,S.M. Pawar,C.D. Lokhande 한국물리학회 2010 Current Applied Physics Vol.10 No.3

An electrosynthesis process of hydrophilic polyaniline nanofiber electrode for electrochemical supercapacitor is described. The TGA–DTA study showed polyaniline thermally stable up to 323 K. Polyaniline nanofibers exhibit amorphous nature as confirmed from XRD study. Smooth interconnected fibers having diameter between 120–125 nm and length typically ranges between 400–500 nm observed from SEM and TEM analysis. Contact angle measurement indicated hydrophilic nature of polyaniline fibers. Optical study revealed the presence of direct band gap with energy 2.52 eV. The Hall effect measurement showed room temperature resistivity ~3 × 10-4 Ω cm and Hall mobility 549.35 cm-2V-1 s-1. The supercapacitive performance of nanofibrous polyaniline film tested in 1 M H2SO4 electrolyte and showed highest specific capacitance of 861 F g-1 at the voltage scan rate of 10 mV/s.

In-silico elucidation of phytoconstituents against 1LPB protein and anti-dyslipidaemic activity of Psoralea corylifolia Linn leaf extract

Pushpa A. Karale,Shashikant C. Dhawale,Mahesh A. Karale 경희대학교 융합한의과학연구소 2023 Oriental Pharmacy and Experimental Medicine Vol.23 No.4

Psoralea corylifolia L. has been used in traditional Chinese and Ayurvedic medicine systems for management of various diseases. The various phytochemical constituents work in orchestric manner to treat diverse illnesses. Current pharmacotherapies shown beneficiary role in treatment of dyslipidaemia but facing life threatening side effects. The usage of herbs increased worldwide and paves the way for development of pharmaceuticals for hyperlipidemia treatment. The main objective of present work was to investigate anti-hyperlipidemic activity and in-silico pancreatic lipase inhibitory potential of Psoralea corylifolia L. (PC) leaf extract. The existence of several phytoconstituents was confirmed by the chromatographic research and mainly includes the flavonoids and furanocoumarins. All studied phytoconstituents were found to have superior binding affinity than standard orlistat (− 7.1 kcal/mol), with docking score ranges from − 10.6 to − 7.3 kcal/mol. At 200 mg/ kg/day the ethanolic leaf extract demonstrated highest lipid lowering action. Ethanolic leaf extract of Psoralea corylifolia revealed evidential antihyperlipidemic potential in a concentration dependent manner (P < 0.01). The serum lipid profile (LDL, VLDL, TG, TC) dropped firmly and HDL elevated in hyperlipidemic rats treated with plant extract compared with the hyperlipidemic group rats (P < 0.01). The hepatic TC and TG abruptly increased in hyperlipidemic rats and significantly reduced in hyperlipidemic rats administered with EPC compared with the control group (P < 0.01). The hyperlipidemic rats treated with atorvastatin and PC at different doses shown evidentiary increase in secretion of TC and TG compared with the hyperlipidemic group rats. The study results proposed that EPC leaf extract demonstrated noteworthy antihyperlipidemic action. The findings of docking study recommend utilization of the best ligands experimentally to develop novel anti-obesity agents. Psoralea corylifolia L. has been used in traditional Chinese and Ayurvedic medicine systems for management of various diseases. The various phytochemical constituents work in orchestric manner to treat diverse illnesses. Current pharmacotherapies shown beneficiary role in treatment of dyslipidaemia but facing life threatening side effects. The usage of herbs increased worldwide and paves the way for development of pharmaceuticals for hyperlipidemia treatment. The main objective of present work was to investigate anti-hyperlipidemic activity and in-silico pancreatic lipase inhibitory potential of Psoralea corylifolia L. (PC) leaf extract. The existence of several phytoconstituents was confirmed by the chromatographic research and mainly includes the flavonoids and furanocoumarins. All studied phytoconstituents were found to have superior binding affinity than standard orlistat (− 7.1 kcal/mol), with docking score ranges from − 10.6 to − 7.3 kcal/mol. At 200 mg/ kg/day the ethanolic leaf extract demonstrated highest lipid lowering action. Ethanolic leaf extract of Psoralea corylifolia revealed evidential antihyperlipidemic potential in a concentration dependent manner (P < 0.01). The serum lipid profile (LDL, VLDL, TG, TC) dropped firmly and HDL elevated in hyperlipidemic rats treated with plant extract compared with the hyperlipidemic group rats (P < 0.01). The hepatic TC and TG abruptly increased in hyperlipidemic rats and significantly reduced in hyperlipidemic rats administered with EPC compared with the control group (P < 0.01). The hyperlipidemic rats treated with atorvastatin and PC at different doses shown evidentiary increase in secretion of TC and TG compared with the hyperlipidemic group rats. The study results proposed that EPC leaf extract demonstrated noteworthy antihyperlipidemic action. The findings of docking study recommend utilization of the best ligands experimentally to develop novel anti-obesity agents. Keywords Psoralea

Slope Stability Analysis of Xanthan Gum Biopolymer Treated Laterite Soil Using Plaxis Limit Equilibrium Method (PLAXIS LE)

Shailendra P. Banne,Arun W. Dhawale,Rajkumar B. Patil,Manjitsinh Girase,Chinmay Kulkarni,Mayuri Dake,Simran Khan 대한토목학회 2024 KSCE Journal of Civil Engineering Vol.28 No.4

The landslides or slope failures are responsible for many fatalities and significant delays in travel by blocking the roads. The soil properties such as cohesiveness, angle of internal friction, and bulk unit weight are the primary parameters responsible for land stability and should be considered for the analysis. In this paper, a Xanthan Gum (XG) biopolymer is applied to the laterite soil to improve its engineering properties. The Plaxis Limit Equilibrium (LE) 2D software is utilized to analyze the slope's stability. Four section/ paths of the Lote Parshuram Ghat in the Ratnagiri area of Maharashtra, India are taken for the analysis. It is observed that the applicationof the XG to the soil which is exposed to atmosphere (normal condition) and submerged conditions improves the strength of the soil and stability of slopes. When compared to conventional laterite soil in its natural state, the cohesiveness of soil treated with XG at concentrations ranging from 1 to 5% is greatly improved, increasing from 250.51% to 378.64%. XG-treated laterite soil has a maximum dry density of 1.72 gm/cc, 28.36% higher than untreated soil. Submerged XG-treated soil often shows a factor of safety (FOS) improvement of across 57.25%. The slope stability analysis revealed that the optimum percentage of xanthan gum as a stabilizer for the submerged slope condition is 2.7% that increase the factor of safety. In case of normal condition, the factor of safety (FOS) and strength of the laterite soil increases with the reinforced percentage of xanthan gum.

Binder-free novel Cu₄SnS₄ electrode for high-performance supercapacitors

Lokhande, A.C.,Patil, Amar,Shelke, A.,Babar, P.T.,Gang, M.G.,Lokhande, V.C.,Dhawale, Dattatray S.,Lokhande, C.D.,Kim, Jin Hyeok Elsevier 2018 ELECTROCHIMICA ACTA Vol.284 No.-

<P><B>Abstract</B></P> <P>In this work, for the first time, we report the direct coating of ternary chalcogenide-based nanostructured Cu<SUB>4</SUB>SnS<SUB>4</SUB> (CTS) thin film electrodes for the energy storage application. The phase purity, composition, microstructure, optical and electrical properties of the synthesized electrode are validated through comprehensive characterization techniques. In the supercapacitive application, the CTS electrode delivers an excellent performance with the maximum specific capacitance of 704 F/g, an energy density of 27.77 Wh/kg and a power density of 7.14 kW/kg in 1 M NaOH electrolyte solution. The intrinsic electrode properties such as the electronic conductivity, crystal structure and film hydrophilicity are found to be influential parameters for the obtained high performance and are studied in detail. Furthermore, the solid-state supercapacitive device fabricated using CTS electrodes and polymer gel electrolyte (PVA/NaOH) in a symmetric configuration, demonstrated the highest specific capacitance of 34.9 F/g with an energy density of 2.4 Wh/kg, a power density of 0.291 kW/kg and more than 89.9% capacitive retention. The presented work reports a simple, cost-effective, scalable and replicable approach for electrode application in supercapacitor industry.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Specific capacitance of 704 F/g, an energy density of 27.77 Wh/kg and a power density of 7.14 kW/kg. </LI> <LI> The intrinsic electrode properties, such as the electronic conductivity, crystal structure and hydrophilicity are found to be influential parameters. </LI> <LI> Symmetric device: specific capacitance of 34.9 F/g, an energy density of 2.4 Wh/kg, a power density of 0.291 kW/kg with 89.9% capacitive retention for 1000 cycles. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>The obtained porous microstructure of the CTS thin film electrode using SILAR method and its electrochemical characterization in solid-state symmetric configuration. The CV and GCD curves are accomplished in the potential window range of 0–1.2 V. The device exhibited 89.9% stability retention after 1000 CV cycles.</P> <P>[DISPLAY OMISSION]</P>

Purification and Characterization of Bacterial Aryl Alcohol Oxidase from Sphingobacterium sp. ATM and Its Uses in Textile Dye Decolorization

Dhawal P. Tamboli,Amar A. Telke,Vishal V. Dawkar,Shekhar B. Jadhav,Sanjay P. Govindwar 한국생물공학회 2011 Biotechnology and Bioprocess Engineering Vol.16 No.4

Aryl alcohol oxidase (AAO) produced by dye decolorizing bacteria Sphingobacterium sp. ATM, was purified 22.63 fold to a specific activity of 21.75 μmol/min/mg protein using anion exchange and size exclusion chromatography. The molecular weight of the purified AAO was found to be 71 kDa using sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE),and confirmed by zymography of AAO using L-dopa. The enzyme showed substrate specificity towards veratryl alcohol, followed by n-propanol. The optimum pH and temperature of purified AAO were found to be 3.0 and 40°C, respectively. The K_m and V_(max) of AAO was 1.1615mM and 3.13 mM/min when veratryl alcohol was used as substrate. Sodium azide showed maximum inhibition while ethylenediamine tetra acetic acid (EDTA), L-cysteine and dithiothreitol showed slight inhibition. Metal ions also showed slight inhibition. HPLC analysis confirmed the degradation of Direct Red 5B. The metabolite obtained after decolorization of Direct Red 5B was characterized as 3 diazenyl 7 [-(phenyl carbonyl) amino] naphthalene-2-sulfonic acid using GC-MS analysis.

TENOR:A FAST ATPG FOR TRANSITION FAULTS IN COMBINATIONAL CIRCUITS

Tyagi,Dhawal,Ha,Dong Sam 대한전자공학회 1995 ICVC : International Conference on VLSI and CAD Vol.4 No.1

Delay fault testing becomes important for high speed VLS circuits. This paper presents an automatic test pattern generator called TENOR for delay faults in combinational circuits. TENOR considers transition faults which are a special class of gate delay faults. The key approach employed in TENOR is to map a transition fault into two stuck-at faults. After transition faults have been converted into stuck-at faults, several efficient algorithms developed for stuck-at faults are employed in TENOR. The algorithms include the FAN algorithm for test generation, parallel pattern single fault propagation for fault simulation, and superstring algorithm for test compaction. Experimental results indicate that TENOR is highly efficient in speed.

Purification and Characterization of Veratryl Alcohol Oxidase from Comamonas sp. UVS and Its Role in Decolorization of Textile Dyes

Umesh U. Jadhav,Vishal V. Dawkar,Dhawal P. Tamboli,Sanjay P. Govindwar 한국생물공학회 2009 Biotechnology and Bioprocess Engineering Vol.14 No.3

In the present work, we have purified veratryl alcohol oxidase (VAO) enzyme from Comamonas sp. UVS to evaluate its potential to decolorize textile dyes. VAO was purified (13.9 fold) by an ion exchange followed by the size exclusion chromatography. Molecular weight of the VAO was estimated to be about 66 kDa by SDS-PAGE. The optimum pH and temperature of oxidase were 30°C and 65°C, respectively. VAO showed maximum activity with n-propanol among the various substrates (n-propanol, veratryl alcohol, L-dopa, tryptophan, etc.). Under standard assay conditions, Km value of the enzyme was 2.5 mM towards veratrole. The enzyme activity was completely inhibited by 0.5 mM sodium azide. L-cysteine, dithiothreitol, and the metal chelator, EDTA had a slight inhibitory effect. The purified enzyme was able to decolorize textile dyes, Red HE7B (57.5%) and Direct Blue GLL (51.09%) within 15 h at 40 μg/mL concentration. GC-MS analysis of the metabolites suggested oxidative cleavage and desulphonation of these dyes In the present work, we have purified veratryl alcohol oxidase (VAO) enzyme from Comamonas sp. UVS to evaluate its potential to decolorize textile dyes. VAO was purified (13.9 fold) by an ion exchange followed by the size exclusion chromatography. Molecular weight of the VAO was estimated to be about 66 kDa by SDS-PAGE. The optimum pH and temperature of oxidase were 30°C and 65°C, respectively. VAO showed maximum activity with n-propanol among the various substrates (n-propanol, veratryl alcohol, L-dopa, tryptophan, etc.). Under standard assay conditions, Km value of the enzyme was 2.5 mM towards veratrole. The enzyme activity was completely inhibited by 0.5 mM sodium azide. L-cysteine, dithiothreitol, and the metal chelator, EDTA had a slight inhibitory effect. The purified enzyme was able to decolorize textile dyes, Red HE7B (57.5%) and Direct Blue GLL (51.09%) within 15 h at 40 μg/mL concentration. GC-MS analysis of the metabolites suggested oxidative cleavage and desulphonation of these dyes

Characterization of ash samples from sewage sludge incinerated in the fluidized bed rig

( Zhanel Arshabekova ),( Yerbol Sarbassov ),( Maria Izquierdo ),( Dhawal Shah ) 한국폐기물자원순환학회 2022 ISSE 초록집 Vol.2022 No.-

Daily production of municipal sewage sludge coming from wastewater treatment plants is becoming a global issue and requires efficient material and energy recovery. Limited applications of sewage sludge (SS) as raw material and decreasing amount of land in which SS is traditionally used as a soil conditioner represents a severe environmental problem in our society. The presence of heavy metals in the sludge further limits its suitability for usage as fertilizers. In the context of a circular economy, incineration with fluidized bed technologies, along with use of by-products such as ash for construction materials, is under investigation in different countries. Incineration of sewage sludge, along with coal, is an optimum way to utilize the organic content of the sludge, maintaining high combustion efficiency with low flue-gas emissions. Moreover, the application of incinerated sewage sludge ash (ISSA) in the cement industry also resolves the problem of SS and ISSA disposal. Pozzolanic properties indicate ISSA's high potential for exploitation as a supplementary cementing material. However, the application of ISSA in the cement manufacturing process requires careful control since the content of the raw material differs remarkably, determined by the method of SS production and incineration technique. In this work, a detailed thermo-chemical analysis of the ISSA produced from fluidized bed combustion of Kazakhstan’s municipal sewage sludge is performed and compared with the ISSA obtained from furnace incineration. The effect of SS combustion temperature on the ISSA’s pozzolanic activity is determined using TGA/DTA analysis and the Frattini test. Different amounts of SSA (5% - 35%) were utilized to evaluate the pozzolanic activity of mortar mixtures. Compressive strengths of Portland cement and ISSA mortars with 5-35 %wt ISSA were quantified and characterized chemically and physically through Fourier transform infrared spectroscopy and scanning electron microscopy analyses. It was found that the ISSA was capable of cementitious material at a content of up to 15%.