Mulayam Gaur - Academia.edu (original) (raw)

Papers by Mulayam Gaur

Sensor Review, 2021

Purpose This information will be useful in the selection of materials and technology for the dete... more Purpose This information will be useful in the selection of materials and technology for the detection and removal of mercury ions at a low cost and with high sensitivity and selectivity. The purpose of this study is to provide the useful information for selection of materials and technology to detect and remove the mercury ions from water with high sensitivity and selectivity. The purpose of this study is to provide the useful information for selection of materials and technology to detect and remove the mercury ions from water with high sensitivity and selectivity. Design/methodology/approach Different nano- and bio-materials allowed for the development of a variety of biosensors – colorimetric, chemiluminescent, electrochemical, whole-cell and aptasensors – are described. The materials used for their development also make it possible to use them in removing heavy metals, which are toxic contaminants, from environmental water samples. Findings This review focuses on different tech...

Journal of Thermal Analysis and Calorimetry, 2016

Nanocomposite thin films containing PVDF and BaZrO 3 have been prepared by solution cast techniqu... more Nanocomposite thin films containing PVDF and BaZrO 3 have been prepared by solution cast technique. The thin films of different mass% of BaZrO 3 nanoparticles were prepared. Heating rate and BaZrO 3-concentration-dependent pyroelectric properties have been investigated. Pyroelectric effect is only observable during the period in which the temperature changes. The nanofiller improve the surface and bulk structure of (PVDF) and could be able to improve dipole concentration. The BaZrO 3-enhanced formation of crystalline b phase in PVDF is due to strong interaction between the-C=O groups in BaZrO 3 and the-CF 2 groups in PVDF, and the BaZrO 3-induced nanostructures of amorphous and crystalline phases. This nanostructure enhances the pyroelectric activity of PVDF.

Proceedings of the International Conference on Nanotechnology for Better Living, 2016

Chinese Journal of Polymer Science, 2008

A series of spherical activated carbons (SACs) with different pore structures were prepared from ... more A series of spherical activated carbons (SACs) with different pore structures were prepared from chloromethylated polydivinylbenzene by ZnCl2 activation. The effects of activation temperature and retention time on the yield and textural properties of the resulting SACs were studied. All the SACs are generated with high yield of above 65% and exhibit relatively high mesopore fraction (me%) of 35.7%−43.6% compared with conventional activated carbons. The sample zlc28 prepared at 800°C for 2 h has the largest BET surface area of 891 m 2 g −1 and pore volume of 0.489 cm 3 g −1 . SEM and XRD analyses of zlc28 verify the presence of developed porous structure composed of disordered micrographite stacking with large amounts of interspaces in the order of nanometers.

Journal of Thermal Analysis and Calorimetry, 2015

The research on development of nanodielectric material is the requirement of capacitor industry. ... more The research on development of nanodielectric material is the requirement of capacitor industry. The polymeric material could not have a high dielectric constant due to limitation of structure and physical properties. However, combination of suitable nanofiller can increase the dielectric constant several times. We have reported the dielectric properties of polysulfone ? ZnO nanodielectric system. The dielectric properties are observed to be governed by dipolar polarization fully and interfacial polarization partially. The relaxation time of dipoles is quite high: It means that nanodipoles have sufficient relaxation time to orient in the direction of field. Interface provides additional trapping level for storage of charge carriers energetically. The permittivity of new material increases many times of base material even at lower concentration of fillers.

International Symposium on Advances in Ground Technology & Geo-Information, 2011

AIP Conference Proceedings, 2011

Polymer nanocomposite samples of different weight ratio of CdS were developed by solution embeddi... more Polymer nanocomposite samples of different weight ratio of CdS were developed by solution embedding of nanoparticles in polyurethane. XRD and Scanning Electron Microscopy (SEM) were used to understand the structural properties of polymer nanocomposite samples. SEM micrograph demonstrates the dispersion of CdS nanoparticles in polymer matrix. It has been observed that crystallinity of PU decreases with increase in concentration of

Journal of Materials Science Letters, 1992

Applied Surface Science, 2018

Highly ordered conductive polyaniline (PANI) coatings containing gold nanoparticles were prepared... more Highly ordered conductive polyaniline (PANI) coatings containing gold nanoparticles were prepared by low-energy electron beam deposition method, with emeraldine base and chloroauric acid used as target materials. The molecular and chemical structure of the layers was studied by Fourier transform infrared, Raman, UV-vis and X-ray photoelectron spectroscopy. The morphology of the coatings was investigated by atomic force and transmission electron microscopy. Conductive properties were obtained by impedance spectroscopy method and scanning spreading resistance microscopy mode at the micro-and nanoscale. It was found that the emeraldine base layers formed from the products of electron-beam dispersion have extended, non-conductive polymer chains with partially reduced structure, with the ratio of imine and amine groups equal to 0.54. In case of electron-beam dispersion of the emeraldine base and chloroauric acid, a protoemeraldine structure is formed with conductivity 0.1 S/cm. The doping of this structure was carried out due to hydrochloric acid vapor and gold nanoparticles formed by decomposition of chloroauric acid, which have a narrow size distribution, with the most probable diameter about 40 nm. These gold nanoparticles improve the conductivity of the thin layers of PANI + Au composite, promoting intra-and intermolecular charge transfer of the PANI macromolecules aligned along the coating surface both at direct and alternating voltage. The proposed deposition method of highly oriented, conductive nanocomposite PANI-based coatings may be used in the direct formation of functional layers on conductive and non-conductive substrates.

International Journal of Environmental Analytical Chemistry

A simple and rapid positive–negative colorimetric approach to determine the presence of antimony ... more A simple and rapid positive–negative colorimetric approach to determine the presence of antimony ions based on the use of gold nanoparticles conjugated with oligonucleotide (poly-A sequence) is developed. Colorimetric measurements reveal that the aggregates of modified gold nanoparticles were afforded after adding antimony ions, thus changing the solution color from pink to blue. The results of aptamer’s interaction on the gold nanoparticle surface with target analyte can be detected either by photometry or by the naked eye. The realized assay provides rapid (2 min), sensitive (detection limit 10 ng/mL), specific, and precise (variation coefficient less than 3.8%) detection of antimony (III) in drinking water

Materials Research Express

Journal of Nanoscience and Nanotechnology

Journal of Thermal Analysis and Calorimetry