Influence of reduced graphene oxide-TiO₂ composite nanofibers in organic indoline DN350 based dye sensitized solar cells

Patil, Jyoti V.,Mali, Sawanta S.,Shaikh, Jasmin S.,Patil, Akhilesh P.,Patil, Pramod S.,Hong, Chang Kook Elsevier 2019 Synthetic metals Vol.256 No.-

<P><B>Abstract</B></P> <P>In this study, the highly efficient organic indoline DN350 based dye sensitized solar cells (DSSCs) have been fabricated using reduced graphene oxide (rGO)-TiO<SUB>2</SUB> composite nanofibers (NFs) and tested its photovoltaic properties. The influence of the rGO on the morphology, structural properties of the TiO<SUB>2</SUB> NFs have been characterized by various techniques. Our photovoltaic results revealed that the modified rGO-TiO<SUB>2</SUB> composite NFs exhibited higher power conversion efficiency (PCE) in comparison with the pristine-TiO<SUB>2</SUB> NFs. The electrochemical analysis indicated that the GO content provides more active sites results in higher dye adsorption which consequently improves the DSSCs performance. Our optimized sample containing 4 mg-rGO-TiO<SUB>2</SUB> NFs exhibited the best performance with 4.43% PCE, which is higher than the pristine-TiO<SUB>2</SUB> NFs (3.83%). Overall, this study presents the rGO-TiO<SUB>2</SUB> composite NFs as a novel strategy for enhancing the efficiency of the organic indoline DN350 based DSSCs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Electrospun reduced graphene oxide (rGO)-TiO<SUB>2</SUB> composite nanofibers. </LI> <LI> rGO-TiO<SUB>2</SUB> composite nanofibers for organic indoline DN350 DSSCs. </LI> <LI> The 4.42% power conversion efficiency achieved for DSSC. </LI> </UL> </P>

Spherical crystallization of ezetimibe for improvement in physicochemical and micromeritic properties

Ashwini Patil,Yogesh Pore,Yogesh Gavhane,Shitalkumar Patil,Sachinkumar Patil 한국약제학회 2014 Journal of Pharmaceutical Investigation Vol.44 No.3

Spherical agglomerates of ezetimibe (EZT)were prepared with hydrophilic polymers; polyvinyl pyrrolidoneK30 (PVP) and/or poloxamer 188 (poloxamer) atdrug to polymer ratios of 1:1 (w/w) by spherical crystallizationtechnique, in order to improve its physicochemicaland micromeritic properties. Three different bridging liquids;chloroform, dichloromethane and/or ethyl acetatealong with good solvent acetone and poor solvent waterwere used to form six batches of agglomerates. Initialcharacterization of all batches in terms of micromeritic andphysicochemical properties resulted in optimization of (A3,EZT:PVP:ethyl acetate) and (B3, EZT:poloxamer:ethylacetate) batches and hence further investigated for drug–polymer interaction, crystallinity and morphology usingFTIR, XRPD, DSC and SEM techniques. The resultsindicated presence of hydrogen bonding, crystallinity andspherical shape in agglomerates. Therefore, the optimizedagglomerates (B3) were directly compressed into tablet. Unfortunately, drug release from the tablet was not satisfactory,suggesting a need of disintegrant from dissolutionpoint of view. Therefore, these agglomerates were recompressedincorporating certain excipients and evaluated asper pharmacopoeia. The dissolution rate of prepared tabletwas similar to that of marketed tablet (p[0.05). It couldbe concluded that spherical crystallization could be one ofthe effective and alternative approaches for improvedperformance of EZT and its tablet formulation.

Improved electrochemical performance of activated carbon/polyaniline composite electrode

Patil, D.S.,Pawar, S.A.,Devan, R.S.,Ron Ma, Y.,Ri Bae, W.,Hyeok Kim, J.,Patil, P.S. North-Holland 2014 Materials Letters Vol.117 No.-

The composite thin films of activated carbon/polyaniline (AC/PANI) have been deposited on stainless steel substrates by a facile dip coating technique. Surface morphology of the films is examined by field emission scanning electron microscopy, which revealed aggregated nanofiber like structure for PANI and well distributed nanofibers with porous structure for AC/PANI films. The highest specific capacitance of 534Fg<SUP>-1</SUP> at 5mVs<SUP>-1</SUP> and energy density of 78.49Whkg<SUP>-1</SUP> at 1mAcm<SUP>-2</SUP> is observed for the AC/PANI electrode, indicating positive synergistic effect of AC and PANI.

Polyaniline based electrodes for electrochemical supercapacitor: Synergistic effect of silver, activated carbon and polyaniline

Patil, D.S.,Pawar, S.A.,Devan, R.S.,Mali, S.S.,Gang, M.G.,Ma, Y.R.,Hong, C.K.,Kim, J.H.,Patil, P.S. Elsevier Sequoia 2014 Journal of electroanalytical chemistry Vol.724 No.-

The composite thin films of Silver-activated carbon/polyaniline (Ag-AC/PANI) have been deposited on stainless steel substrates by a facile dip coating technique. The formation of Ag-AC/PANI electrode is analyzed by Fourier transform infrared, Fourier transform-Raman and X-ray photoelectron spectroscopy techniques. Field Emission Scanning Electron Microscopy revealed the presence of Ag nanoparticles on the porous spongy background of PANI. The highest specific capacitance of 567Fg<SUP>-1</SUP>at 5mVs<SUP>-1</SUP> and energy density of 86.30Whkg<SUP>-1</SUP> at 1mAcm<SUP>-2</SUP> is observed for the Ag-AC/PANI indicating positive synergistic effect of silver, activated carbon and PANI. In which silver nanoparticles help in improving the electronic conductivity and activated carbon enhances the electrochemical stability of the PANI electrodes.

A simple, room temperature, solid-state synthesis route for metal oxide nanostructures

Patil, Supriya A.,Shinde, Dipak V.,Ahn, Do Young,Patil, Dilip V.,Tehare, Kailas K.,Jadhav, Vijaykumar V.,Lee, Joong K.,Mane, Rajaram S.,Shrestha, Nabeen K.,Han, Sung-Hwan The Royal Society of Chemistry 2014 Journal of Materials Chemistry A Vol.2 No.33

<P>In this work, we demonstrate an extremely simple but highly effective strategy for the synthesis of various functional metal oxides (MOs) such as ZnO, In2O3, Bi2O3, and SnO2nanoparticles with various distinct shapes at room temperature<I>via</I>a solid-state reaction method. The method involves only mixing and stirring of the corresponding metal salt and NaOH together in the solid phase, which yields highly crystalline metal oxides within 5-10 min of reaction time. The obtained paste can be directly doctor-bladed onto a variety of substrates for photoelectrochemical applications. The crystal structure and surface composition of the MOs are obtained by X-ray diffraction patterns, energy dispersive analysis and X-ray photoelectron spectroscopy, respectively. The surface morphology is confirmed from the scanning electron microscopy surface photo-images. The surface area and pore size distribution are studied by the N2adsorption method. As a proof-of-concept demonstration for the application, ZnO nanoplate structures are envisaged in DSSCs as photoanodes, which enables us to obtain excellent photovoltaic properties with a power conversion efficiency of 5%. The proposed method does not require a sophisticated instrumental setup or harsh conditions, and the method is easily scalable. Hence, it can be applied for the cost-effective and large-scale production of MO nanoparticles with high crystallinity.</P>

Enhanced magnetoelectric coupling in stretch-induced shear mode magnetoelectric composites

Patil Deepak Rajaram,Park Sung Hoon,Patil Seema,Kumar Ajeet,Ryu Jungho 한국세라믹학회 2021 한국세라믹학회지 Vol.58 No.6

Magnetoelectric (ME) laminates consisting of Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 (PMN-PT)-based single crystals have recently attracted significant interest owing to their excellent piezoelectric properties. Particularly, ME laminates with d 15 -mode single crystals exhibit the strongest ME coupling, but the fabrication of ME laminates with 15 shear modes is challenging. Herein, we propose the generation of a stretch–shear mode ( d 15 -mode) by clamping the opposite ends of the top and bottom magnetostrictive layers in symmetric ME laminates. Two diff erent shear-stress-induced ME laminates were fabricated using Metglas/Galfenol as magnetostrictive layer, and 15-PMN-PZT as a piezoelectric layer. The ME laminates were studied under two different conditions, unclamped and clamped. Under unclamped condition, Galfenol/15-PMN-PZT/Galfenol (Metglas/15- PMN-PZT/Metglas) laminate showed maximum α ME value of 1.71 V/cm∙Oe (0.62 V/cm∙Oe), while under clamped condition, Galfenol/ d 15 -PMN-PZT/Galfenol (Metglas/15-PMN-PZT/Metglas) laminate exhibited an enhanced α ME value of 2.40 V/ cm∙Oe (0.87 V/cm∙Oe), indicating successful generation of the stretch–shear mode. Under clamped condition, α ME was enhanced by 140% compared with the that of the unclamped case, suggesting a 40% (0.25 V/cm∙Oe) contribution from the pure shear ME voltage coefficient along with the longitudinal extension contribution.

Structural and electrical properties of NASICON type solid electrolyte nanoscaled glass-ceramic powder by mechanical milling for thin film batteries.

Patil, Vaishali,Patil, Arun,Yoon, Seok-Jin,Choi, Ji-Won American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.5

<P>During last two decades, lithium-based glasses have been studied extensively as electrolytes for solid-state secondary batteries. For practical use, solid electrolyte must have high ionic conductivity as well as chemical, thermal and electrochemical stability. Recent progresses have focused on glass electrolytes due to advantages over crystalline solid. Glass electrolytes are generally classified into two types oxide glass and sulfide glass. Oxide glasses do not react with electrode materials and this chemical inertness is advantageous for cycle performances of battery. In this study, major effort has been focused on the improvement of the ion conductivity of nanosized LiAlTi(PO4)3 oxide electrolyte prepared by mechanical milling (MM) method. After heating at 1000 degrees C the material shows good crystallinity and ionic conductivity with low electronic conductivity. In LiTi2(PO4)3, Ti4+ ions are partially substituted by Al3+ ions by heat-treatment of Li20-Al2O3-TiO2-P2O5 glasses at 1000 degrees C for 10 h. The conductivity of this material is 1.09 x 10(-3) S/cm at room temp. The glass-ceramics show fast ion conduction and low E(a) value. It is suggested that high conductivity, easy fabrication and low cost make this glass-ceramics promising to be used as inorganic solid electrolyte for all-solid-state Li rechargeable batteries.</P>

Silver incorporated PEDOT: PSS for enhanced electrochemical performance

Patil, D.S.,Pawar, S.A.,Hwang, J.,Kim, J.H.,Patil, P.S.,Shin, J.C. Korean Society of Industrial and Engineering Chemi 2016 Journal of industrial and engineering chemistry Vol.42 No.-

A simple strategy is proposed for the development of silver (Ag) incorporated Poly (3,4-ethylenedioxythiophene):poly (styrene sulfonate) (PEDOT:PSS) electrodes for electrochemical supercapacitors. To examine the effects of the Ag on the specific capacitance and energy density of PEDOT:PSS, its concentration was varied from 0.3 to 1.5wt.% Ag. Surface morphology of the films is examined by field emission scanning electron microscopy, which revealed the smooth surface for PEDOT:PSS and existence of small Ag bright spots onto the smooth surface of PEDOT:PSS for the Ag-PEDOT:PSS. The electrochemical activity of PEDOT:PSS was enhanced after its interaction with Ag. An electrode with 0.9wt.% Ag in PEDOT:PSS showed superior specific capacitance (172Fg<SUP>-1</SUP>) and energy density (36.11WhKg<SUP>-1</SUP>) due to the synergistic effect of both Ag and PEDOT:PSS. These results were extensively examined using different characterization tools. This study will provide a new avenue for designing low cost and excellent electrochemical performance electrode based on Ag-PEDOT:PSS for better supercapacitors.

Genetic relatedness among Helicoverpa armigera ($H\"{u}bner$) occurring on different host plants as revealed by random amplified polymorphic DNA markers

Patil Suvarna,Bashasab Fakrudin,Vijaykumar Vijaykumar,Basavanagoud Basavanagoud,Kuruvinashetti Mahaling S,Patil Basavaraj V Korean Society of Applied Entomology 2006 Journal of Asia-Pacific Entomology Vol.9 No.3

The genetic relatedness among Helicoverpa armigera ($H\"{u}bner$) occurring on different host plants prevailing in South India was studied using PCR-RAPD. Genomic DNA was isolated individually from five larvae collected from each of 10 different host plants (except in okra). PCR-RAPD analysis was carried out using a set of 20 random primers which had produced repeatable banding patterns from a original set of 60 primers. A set of 155 amplicon levels were available for analysis, of which 154 were polymorphic. An average of 7.75 bands per primer was recorded. Similarity coefficients based on the frequency of band sharing among host strains varied from 0.25 in cotton and sunflower to 0.72 in groundnut. Clustering analysis on the basis of the PCR-RAPD-generating band sharing indicated that most of the individuals occurring on niger, safflower, green gram, abutilon and lagasca clustered together, indicating greater genetic similarity among themselves, than those occurring on other crops. Furthermore, the pattern of genetic variation in the individuals collected from niger, safflower, green gram, groundnut, abutilon and lagasca was seem to be largely host-dependent.

Clinical Efficacy of a Mouth-Exercising Device Adjunct to Local Ointment, Intra-Lesional Injections and Surgical Treatment for Oral Submucous Fibrosis: a Randomized Controlled Trial

Patil, Pravinkumar,Hazarey, Vinay,Chaudhari, Rekha,Nimbalkar-Patil, Smita Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.3

Background: Oral physiotherapy or mouth exercise is considered to be an adjunct but mandatory treatment modality for oral submucous fibrosis (OSMF). This study planned to evaluate the clinical efficacy of a newly designed mouth exercising device (MED) in OSMF patients receiving local ointment, intra-lesional drugs and surgical treatment. Materials and Methods: A total of 231 OSMF patients were selected and treated with basic regime including topical corticosteroids, oral antioxidants and the icecream-stick exercise regime and allotted randomly to two equal groups A and B. Group-A patients were additionally given MED. Subgroups A1 and B1 patients with an inter-incisal distance (IID) 20-35mm were not given any additional therapy; subgroup A2 and B2 patients (IID 20-35mm) were treated additionally with intra-lesional injections. Subgroups A3 and B3 with IID<20mm were managed surgically. IID was measured at baseline and at 6 months recall. The change in IID measurements was calculated and statistically analyzed using 2-way ANOVA and Tukeys multiple post hoc analysis. Results: Average improvement in IID after six months of recall visits was observed to be 8.4 mm in subgroup-A1 (n-53) compared to 5.5 mm in B1(n-50) (p<0.01). The IID improvement in subgroup-A2 was found to be 9.3mm (n-46) compared to 5.1 mm in B2 (n-48) (p<0.01). In the surgery group, mouth opening improvement was observed to be 9.6 mm in subgroup A3 (n-18) compared to 4.8 mm for B3 (n-16) (p<0.01). Conclusions: Use of the MED appears to be effective for increasing oral opening in OMSF patients in conjunction with local, injection and/or surgical treatment.