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Chavan D.N.,Arts Commerce and Science College | Patil G.E.,Materials Research Laboratory Arts | Kajale D.D.,Materials Research Laboratory Arts | Gaikwad V.B.,Materials Research Laboratory | And 2 more authors.
Journal of Sensors | Year: 2011

Thick films of AR grade In2O3 were prepared by standard screen-printing technique. The gas sensing performances of thick films were tested for various gases. It showed maximum sensitivity to ethanol vapour at 350°C for 80ppm concentration. To improve the sensitivity and selectivity of the film towards a particular gas, In2O3 sensors were surface-modified by dipping them in a solution of 2 nanosilver for different intervals of time. Obtained results indicated that spherical nano-Ag grains are highly dispersed on the surface of In2O3sensor. The surface area of the nano-Ag/ In2O3 sensor is several times larger than that of pure In2O3 sensor. In comparison with pure In2O3 sensor, all of the nano-Ag-doped sensors showed better sensing performance in respect of response, selectivity, and optimum operating temperature. The surface-modified (30min) In2O 3 sensor showed larger sensitivity to H2S gas (10ppm) at 100°C. Nano silver on the surface of the film shifts the reactivity of film from ethanol vapour to H2S gas. A systematic study of gas sensing performance of the sensor indicates the key role played by the nano silver species on the surface. The sensitivity, selectivity, response, and recovery time of the sensor were measured and presented. Copyright © 2011 D. N. Chavan et al. Source


Jain G.H.,Materials Research Laboratory | Nahire S.B.,Bw Commerce And Science College | Kajale D.D.,Materials Research Laboratory | Patil G.E.,Materials Research Laboratory | And 3 more authors.
Lecture Notes in Electrical Engineering | Year: 2011

The thick films of pure BaTiO3 (BT) were prepared by screen-printing technique. The gas sensing performances of these films were tested to various gases by using static gas sensing system at various operating temperatures. The pure film showed maximum response to H2S gas at 350 o C but poor selectivity. Different wt% of Cr (0.56, 5.27 and 6.07) was added in BaTiO3, base material, followed by sintering at 550 °C for 30min. The thick films of such powder were prepared by screen-printing technique. The thick films of this Cr-doped BT were prepared and tested to various gases. The Cr2O3-doped BT film (5.27wt %) showed maximum response to ammonia gas at 350° C and suppresses the response to H2S gas. The response of 5.27wt% film was observed to be the most amongst the 0.56 and 6.07wt.The selectivity of the Cr2O 3-doped BT was found to be more against the other gases. The 90% response and recovery levels were attained within 3 and 20 s, respectively for Cr2O3-doped BT (5.27wt %) film. The very short response and recovery time are the important features of this Cr2O 3-doped BT film to NH3 gas. © 2011 Springer-Verlag Berlin Heidelberg. Source


A reliable and sensitive isocratic stability indicating RP-UPLC method has been developed and validated for quantitative analysis and content uniformity study of Amisulpride in tablets. An isocratic method for analysis of Amisulpride was achieved on C18 (100x2.1) mm particle size 1.7 μ columns at of 0.20 mL/min flow rate within shorter runtime of 3 min. Photodiode array detector was used to monitor the eluate at 280 nm. The mobile phase consisted of Buffer-ACN (50:50 v/v), (Buffer: 2 mL Ortho phosphoric acid in 1L water). The drug was subjected to oxidation, hydrolysis, photolysis and thermal degradation. Response was a linear function of drug concentration in the range of 20-80 μg/ml (r2= 0.999) with a limit of detection and quantification of 0. 1 and 0.3 μg/mL respectively. Accuracy (recovery) was between 99 to 101 %. Degradation products resulting from the stress studies did not interfere with the detection of Amisulpride the assay is stability-indicating. Source


Kapse S.K.,Institute of Science | Hiwase V.V.,Arts Commerce and Science College | Kalambe A.B.,Institute of Science
Der Pharma Chemica | Year: 2012

The terpolymer resin p-hydroxyacetophenone- quinhydrone -melamine(abbreviated as PAQM-I) was synthesized by the condensation of p-hydroxyacetophenone (0.1M), quinhydrone (0.1M) and melamine (0.1M) in the presence of polyphosphoric acid (PPA). The structure of resin was determined by its elemental analysis, UV-VIS, IR and NMR data. The molecular weight of terpolymer was determined by non-aqueous conductometric titration technique. Thermo kinetic parameter was determined by Freeman- Carroll (FC) and Sharp-Wentworth (SW) method. The order of degradation reaction determined by FC method was confirmed by SW method. Source


Chavan D.N.,Arts Commerce and Science College | Patil G.E.,Materials Research Laboratory | Kajale D.D.,Materials Research Laboratory | Gaikwad V.B.,Materials Research Laboratory | Jain G.H.,Materials Research Laboratory
Sensors and Transducers | Year: 2011

A series of In1-xCrxO3 composites, with x ranging from 0.01 to 0.5wt% were prepared by mechanochemically starting from InCl3 and CrO3. Structural and micro structural characteristics of the sample were investigated by XRD, SEM with EDAX. Thick films of pure Indium Oxide and composites were prepared by standard screen printing technique. The gas sensitivity of these thick films was tested for various gases. The pure Indium Oxide thick film (x=0) shows maximum sensitivity to ethanol vapour (80 ppm) at 350 °C, but composite-A (x=0.01) thick film shows maximum sensitivity to H2S gas (40 ppm) at 250 °C, composite-B (x=0.1) thick film shows higher sensitivity to NH3 gas (80 ppm) at 250 °C and composite-C (x=0.5) thick film shows maximum sensitivity to Cl2 gas (80 ppm) at 350 °C. A systematic study of gas sensing performance of the sensors indicates the key role played by concentration variation of Cr doped species. The sensitivity, selectivity and recovery time of the sensor were measured and presented. © 2011 IFSA. Source

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