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Navi Mumbai, India

Patil R.J.,Karmaveer Bhaurao Patil College
Rasayan Journal of Chemistry | Year: 2012

Various high molecular weight amines (liquid anion exchangers) are used for solvent extraction studies of metals. Extractive separation of Bi(III) from thiocyanate media using 4-Methyl-N-n-octyl aniline have been reported in this paper. Bi(III) was quantitatively extracted from 0.5M KSCN and 1.0M sulphuric acid with equal volume of 2% 4- Methyl-N-n-octyl aniline in xylene. It was stripped from the organic phase with acetate buffer and estimated complexometrically. The effects of acidity, thiocyanate concentration, reagent concentration, diluents, foreign ions and aqueous to organic phase volume ratio on the extraction have been discussed. Nature of extracted species and extraction mechanism is discussed. The method is applied to synthetic mixtures & alloy. It is fast, accurate & precise. © 2012 RASĀYAN. All rights reserved.

Yadav S.P.,Karmaveer Bhaurao Patil College | Shinde S.S.,Shivaji University | Kadam A.A.,College of Engineering, Pune | Rajpure K.Y.,Shivaji University
Journal of Alloys and Compounds | Year: 2013

The manganese (Mn) substituted cobalt ferrite (Co1-xMn xFe2O4) is synthesized by simple ceramic method with x varied from 0 to 0.5 in step of 0.1. The role of Mn substitution on structural, morphological, dielectrical, magnetic and impedance properties of cobalt ferrite has been investigated. Phase identification was performed by X-ray diffraction analysis which shows the spinel cubic crystal structure. The lattice parameter is found to increase with increase in Mn content. The saturation magnetization (Ms) and coercivity (Hc) are measured from hysteresis plots. Dielectric dispersion having Maxwell-Wagner-type interfacial polarization has been observed for cobalt ferrite samples. Dielectric constant and loss tangent are found to decrease with frequency. AC conductivity measurements suggest that the conduction is due to small polaron hopping. The semiconducting behavior of the samples has been studied by dc resistivity measurements. Room temperature complex impedance analysis shows semicircle attributed to the high resistance values at lower frequencies. © 2012 Elsevier B.V. All rights reserved.

Ghorpade R.,Karmaveer Bhaurao Patil College | Balasubramanya R.H.,Institute of Chemical Technology
Man-Made Textiles in India | Year: 2013

Banana belongs to the family Musaceae of the genus Musa. The banana pseudostem which yields the fibers is considered to be an agricultural waste; so utilization of the pseudostem to extract the fibers by microbial retting is done. The pseudostem is retted anaerobically with the microbial consortium for the specific length of time to remove lignin and pectin to separate the fibers from plant tissue. The microbes involved in retting were isolated and identified. The extracted fibers have been studied for its physico-chemical and mechanical properties. The retted fibers were used in preparation of yarn, nonwoven fabric, blending with jute fabric and handicrafts.

Salunkhe P.R.,SASMIRA | Nayak S.S.,Karmaveer Bhaurao Patil College
Man-Made Textiles in India | Year: 2012

The synthesis of nanoparticles has been entirely a chemical process since decades. Owing to environmental concerns the development of eco-friendly processes for synthesis of nanomaterials is the need of the day. One approach that shows great potential is synthesis of nanoparticles using micro-organisms such as bacteria, yeast and fungi. In this article, isolation of a silver resistant Pseudomonas species from atmospheric air is reported. The product was isolated and tested for silver nanoparticle synthesis by exposing it to various concentrations of silver nitrate in liquid media. Silver nanoparticles (AgNPs) synthesis was confirmed by various analytical techniques. The application of the product developed to impart antibacterial properties to textiles gave encouraging results.

Ghosh S.B.,Bhabha Atomic Research Center | Bhattacharya K.,Bhabha Atomic Research Center | Nayak S.,Karmaveer Bhaurao Patil College | Mukherjee P.,Bhabha Atomic Research Center | And 2 more authors.
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2015

Definitive identification of microorganisms, including pathogenic and non-pathogenic bacteria, is extremely important for a wide variety of applications including food safety, environmental studies, bio-terrorism threats, microbial forensics, criminal investigations and above all disease diagnosis. Although extremely powerful techniques such as those based on PCR and microarrays exist, they require sophisticated laboratory facilities along with elaborate sample preparation by trained researchers. Among different spectroscopic techniques, FTIR was used in the 1980s and 90s for bacterial identification. In the present study five species of Bacillus were isolated from the aerobic predigester chamber of Nisargruna Biogas Plant (NBP) and were identified to the species level by biochemical and molecular biological (16S ribosomal DNA sequence) methods. Those organisms were further checked by solid state spectroscopic absorbance measurements using a wide range of electromagnetic radiation (wavelength 200 nm to 25,000 nm) encompassing UV, visible, near Infrared and Infrared regions. UV-Vis and NIR spectroscopy was performed on dried bacterial cell suspension on silicon wafer in specular mode while FTIR was performed on KBr pellets containing the bacterial cells. Consistent and reproducible species specific spectra were obtained and sensitivity up to a level of 1000 cells was observed in FTIR with a DTGS detector. This clearly shows the potential of solid state spectroscopic techniques for simple, easy to implement, reliable and sensitive detection of bacteria from environmental samples. © 2015 Elsevier B.V. All rights reserved.

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