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Kaur, P.,Shin, M.S.,Sharma, N.,Kaur, N.,Joshi, A.,Chae, S.R.,Park, J.S.,Kang, M.S.,Sekhon, S.S. Pergamon Press ; Elsevier Science Ltd 2015 International journal of hydrogen energy Vol.40 No.3
Carbon based nanomaterials (carbon nanotubes, graphene etc) containing various hetero atoms are promising metal free catalysts for oxygen reduction reaction in fuel cells. We report the non-covalent functionalization of graphene with poly(diallyl dimethylammonium) chloride (PDDA), a polyelectrolyte containing nitrogen, using a very simple method. The addition of a non-ionic surfactant (Triton X-100) during functionalization has been observed to improve the interactions between graphene and PDDA. An up-shift in the position of G-peak in the Raman spectra, down-shift in the binding energy (B.E.) of N1s peak and an up-shift in the B.E. of C1s peak in XPS spectra have been observed due to an inter-molecular charge-transfer from carbon in graphene to nitrogen in PDDA, which get enhanced in the presence of Triton X-100. Graphene functionalized with PDDA also show good thermal stability. The addition of a non-ionic surfactant enhances the non-covalent functionalization of graphene with PDDA, which is desirable from applications point of view.
Nilesh P. Tangale,Shilpa K. Sonar,Prashant S. Niphadkar,Praphulla N. Joshi 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.40 No.-
The hierarchical K/LTL zeolites prepared by post-synthesis modification with aqueous 1.5 M KOHsolution by varying alkali volume to K/LTL zeolite (10–70 ml/g) ratios, were examined in Knoevenagelcondensation. The physico-chemical properties of the catalysts were thoroughly evaluated by PXRD,FTIR, ICP, CO2-TPD, XPS, N2 adsorption/desorption and 29Si and 27Al MAS-NMR. Among all the samples,hierarchical K/LTL prepared by treating K/LTL with 50 ml aqueous 1.5 M KOH solution per gram of K/LTLdisplayed about 1.5 fold higher catalytic activity as compared to parent K/LTL, presumably because ofcombined effect of enhanced basicity and molecular diffusion through pore channels.
Charge transport studies on chemically grown manganite based heterostructures
Keval Gadani,Khushal Sagapariya,K.N. Rathod,Hetal Boricha,Bhargav Rajyaguru,V.G. Shrimali,A.D. Joshi,K. Asokan,N.A. Shah,P.S. Solanki 한국물리학회 2019 Current Applied Physics Vol.19 No.4
In this communication, we have successfully fabricated mixed valent La0.7Ca0.3MnO3 (LCMO) manganite based (i) ZnO/LCMO/LAO and (ii) LMO/LCMO/LAO (LMO: LaMnO3–d thin layer; LAO: LaAlO3 substrate) thin film heterostructures using chemical solution deposition (CSD) method. 100 nm LCMO layer was initially grown on single crystalline (100) LAO substrate followed by the growth of 50 nm ZnO and LMO layers separately on the two different heterostructures. In the present study, upper layers of ZnO and LMO were intentionally prepared at 700 °C for 12 h under air environment, thereby some naturally created oxygen vacancies are expected to be present in their lattices. Presence of oxygen vacancies makes ZnO and LMO layers as n–type oxides in the heterostructures. Temperature dependent current–voltage (I–V) characteristics and interface resistivity (under different applied electric fields across interface only) were carried out to understand their charge transport behavior. A strong effect of electric field on the resistivity behavior has been observed due to a reasonable electrically polarizable (active) nature of ZnO and LMO thin layers. Zener double exchange (ZDE) polynomial law has been employed to understand various scattering processes as source of resistivity across, both, ZnO/ LCMO and LMO/LCMO interfaces. Transport properties and charge conduction mechanisms have been discussed and compared for both the interfaces in the context of interface state and barrier between electrically active layer and LCMO film. Also, power consumption criteria have been discussed in detail for the presently studied heterostructures for their practical device applications such as field effect devices, memory devices, read–write head devices or any other spintronic devices.
Liao, N.,Unnithan, A.R.,Joshi, M.K.,Tiwari, A.P.,Hong, S.T.,Park, C.H.,Kim, C.S. Elsevier 2015 Colloids and surfaces. A, Physicochemical and engi Vol.469 No.-
<P>Electrospun nanofibrous mat for wound dressing application was successfully prepared from poly (6caprolactone) (PCL), cellulose acetate (CA) and dextran blend solution. Incorporation of small amount of tetracycline hydrochloride (TCH), an antibacterial drug, improved the cell proliferation, enhanced blood clotting ability and cell attachment as well as antimicrobial activity of the composite mat. The composite mats were characterized by SEM, FTIR and TGA analysis. In order to evaluate the cytocompatibility and cell behavior of the composite scaffolds, fibroblast cells were seeded on the matrix. Results demonstrated that the incorporation of dextran and drug strongly enhanced the adhesion and proliferation of the cells on the composite nanofibers. The antimicrobial activity of the composite was studied by zone inhibition against Gram-positive and Gram-negative bacteria and the result indicates high antibacterial activity. Therefore, as synthesized composite fiber have decent characteristics for wound dressing and skin engineering applications. (C) 2015 Elsevier B.V. All rights reserved.</P>
Probing charge transport in manganite film through switching parameters
Rathod K.N.,Boricha Hetal,Sagapariya Khushal,Hirpara Bharavi,Dhruv Davit,Joshi A.D.,Pandya D.D.,Singh J.P.,Chae K. H.,Asokan K.,Solanki P.S.,Shah N.A. 한국물리학회 2021 Current Applied Physics Vol.28 No.-
We have investigated the bipolar resistive switching of Y0.95Ca0.05MnO3 (YCMO) thin film on Si substrate using pulsed laser deposition. Simulation of Mn L3,2 near-edge X-ray absorption fine structure has been executed by CTM4XAS to corroborate the presence of a mixed-valence state of Mn ions and oxygen vacancies. The charge transport in the film is described by the space charge limited mechanism. Murgatroyd and space charge limited mechanism relations are used to calculate the mobility and other switching parameters at high resistance state. With a decrease in the switching layer (near to positively biased electrode) thickness, better resistive switching was observed. This work indicates that the localized switching thickness and temperature strongly affect the resistive switching of the YCMO film.
Bhatt, Vaibhav D.,Khade, Prasad S.,Tarate, Sagar B.,Tripathi, Ajai K.,Nauriyal, Dev S.,Rank, Dharamshi N.,Kunjadia, Anju P.,Joshi, Chaitanya G. The Korean Society of Veterinary Science 2012 大韓獸醫學會誌 Vol.52 No.4
The expression profiles of inflammatory cytokines viz. interleukins (IL)-6, IL-8, IL-12, granulocyte macrophage-colony stimulating factor, interferon-${\gamma}$ and tumor necrosis factor-${\alpha}$ in response to subclinical mastitis in indigenous cattle breed Kankrej (n = 6), Gir (Bos indicus) (n = 12) and crossbred (Bos taurus${\times}$Bos indicus) (n = 7) were investigated using quantitative real time PCR. Significant correlation (p < 0.05) was observed between total bacterial load and somatic cell count (SCC) in all three breeds of cattle. All the cytokines were observed to be up-regulated compared to cows with healthy quarters, however, level of their expression varied among three breeds of cattle. In Kankrej most cytokines were found to be transcribed to higher levels than in other two breeds; the milk had higher load of bacteria but not so high SCC, implying that Kankrej has a higher inherent resistance against mastitis. The results of present study indicated that mammary glands of crossbred cattle are more sensitive to bacterial infection than indigenous breed of cattle as they elicit immune response at lower bacterial load and result into higher SCC. Research on identification of factors responsible for differentially expressed cytokines profiles and use of cytokines as immunomodulatory tools can pave way for formulating control strategies against bovine mastitis.
Rotary 제법을 이용한 제올라이트 Membrane 제조 및 특성연구
김권일,김태환,이범석,Joshi, P. N.,정헌도,김종휘 한국공업화학회 2000 응용화학 Vol.4 No.2
The conventional coating methods like dip-, spray- and film coating used to prepare zeolite membrane usually gives in-homogeneous membrane. Here we have used an rotary method to prepare zeolite membrane where a alumina tube was rotated at constant speed and at constant temperature in the zeolite reaction mixture. The zeolite membrane characterized by XRD and SEM was of Zeolite A type. The efficiency of the zeolite membrane was tested for its selectivity toward oxygen in 50% O₂/N₂ gas mixture. There was an increase of 2.8 wt% in the oxygen concentration. The surface area of the membrane was 22 ㎠.
김권일,김태환,이범석,정헌도,( P. N. Joshi ) 한국공업화학회 2001 한국공업화학회 연구논문 초록집 Vol.2001 No.-
수소가스는 현재까지는 가격이 비싸다는 이유 때문에 널리 보급되지는 않고 있지만 연소시 거의 오 염원을 배출하지 않는 이상적인 연료이다. 이러한 이유로 최근 선진국에서는 물론 국내에서도 수소에 대한 전분야적인 연구가 많이 되고 있는 실정이다. 본 연구에서는 기존의 천연가스를 수증기 개질하는 방법과 비교해 보기 위하여 지구온난화 가스인 이산화탄소를 이용하여 메탄올, DME 등의 유용한 물질을 제조하는 원료로 사용되는 일산화탄소와 수소를 제조하는 실험을 실시하였다. 이산화탄소를 메탄이 주성분이고 가격이 극히 저렴한 천연가스를 이용하여 수소의 수율을 비교하기 위한 촉매 종류별 실험결과를 분석해 보았다. 본 연구에서는 담체를 γ-Al<sub>2</sub>O<sub>3</sub>, 실리카 및 HY형 제올라이트에 니켈의 무게비에 따라 니켈을 담지시킨 촉매에서 반응온도를 변화시키면서 온도에 따른 반응활성을 조사하였다. 또한 담체에 따른 니켈촉매의 반응활성을 살펴보았다. 한편 반응실험 후에 열분석 실험을 통해 코크 형성 온도를 알아보았고, 반응 전후 촉매상태를 조사하기 위해 SEM, XRD, BET 등을 사용하여 촉매 특성을 분석하였다.