Paramesh Gadige

• PhD
• Professor (Assistant) at Sri Sathya Sai Institute of Higher Learning; Prasanthi Nilayam

Designing gas sensors functioning at room temperature with ultra-fast response and fast recovery is a great challenge. Metal oxide semiconductors (MOS) have been the primary choice in designing sensitive, and stable gas sensors due to their inherent physical and chemical characteristics. The performance of the MOS sensors has been enhanced by nanos...

Semiconducting bismuth borate glasses in xBi2O3–(1 − x)B2O3 system where x = 0.25, 0.50, and 0.75 (in mol.), and ZnO-glass heterostructures are studied for humidity sensing. Glass samples are prepared using melt-quenching method, whereas pristine ZnO is synthesized by sol–gel process. Heterostructure samples are obtained by adding different weight...

Dense barium bismuth borosilicate glasses of compositions x(BaO+0.5Bi2O3+0.5B2O3) -(1-x) SiO2 (BBS), where x = 0.9, 0.8, 0.7, 0.6, &0.5 are prepared using melt-quenching technique by hot pressing the melt between stainless-steel plates. Silica content of the glasses is derived from the rice husk ash (RHA) (agro-waste) through physical heat treatmen...

Laponite, a synthetic nanosilicate clay and agar, a natural polysaccharide, both imbibe large amount of water and form into hydrogels. Various physical and chemical stimuli elicit the hydrogel response, which has been applied in designing diverse sensors and biomedical systems. In this work, we exploit the change in hydrogel's ionic conductivity du...

Semiconducting bismuth borate glass and ZnO-glass heterostructure samples are studied for humidity sensing. Glasses in the composition of 0.5Bi2O3-0.5B2O3 are obtained by melt-quenching process, whereas ZnO prepared by sol-gel method. ZnO-glass heterostructure samples are obtained by adding pulverized glass powders in different weight fractions to...

Hypothesis While the mechanical disruption of microscopic structures in complex fluids by large shear flows has been studied extensively, the effects of applied strains on the dielectric properties of macromolecular aggregates have received far less attention. Simultaneous rheology and dielectric experiments can be employed to study the dynamics of...

Hypothesis: While the mechanical disruption of microscopic structures in complex fluids by large shear flows has been studied extensively, the effects of applied strains on the dielectric properties of macromolecular aggregates has received far less attention. Simultaneous rheology and dielectric experiments can be employed to study the dynamics of...

Transparent dense barium bismuth borate (BBB) glasses in ternary x(BaO–Bi2O3)–(1–x)B2O3 system, with x = .15, .25, .35, and .45, were prepared by the melt‐quenching process. Density of the glasses increased to 7.145 g/cm³ with increasing BaO–Bi2O3 content. Gamma radiation shielding performance of the glasses was estimated by studying mass attenuati...

Dense glasses in the binary bismuth-borate system, xBi2O3-(1-x)B2O3 (BBO), x = 0.25, 0.5, & 0.75 were prepared by conventional melt-quenching process at different temperatures. The melt was hot pressed between the stainless-steel plates to obtain dense glasses. The glasses obtained were optically clear, thermally stable and amorphous in nature. Tra...

Silver (Ag) nanocrystals (NCs) can be embedded in the glass matrix by simple Na⁺ to Ag⁺ ion-exchange (IE) reaction followed by thermal-treatment. We report the nonisothermal crystallization-kinetic studies on the IE silicate glasses by differential thermal analyses (DTA) at different heating rates. Johnson-Mehl-Avrami-Kolomogoroff (JMAK) model was...

Holmium (Ho³⁺)-doped fluorophosphate glasses (P2O5–BaF2–CaF2–TiO2–Ho2O3, PCfBfTiH) were fabricated by melt-quenching technique. The glass transition (548 °C) and crystallization (577 °C) temperatures and glass stability factor (161 °C) were obtained from DSC analysis. Judd-Ofelt (JO) intensity parameters (Ω2, Ω4 and Ω6) of PCfBfTiH15 glass were eva...

Aqueous colloidal Laponite clay suspensions transform spontaneously to a soft solid-like arrested state as its aging or waiting time increases. This article reports the rapid transformation of aqueous Laponite suspensions into soft solids due to the application of a DC electric field. A substantial increase in the speed of solidification at higher...

Aqueous colloidal Laponite clay suspensions transform spontaneously to a soft solid-like arrested state as its aging or waiting time increases. This article reports the rapid transformation of aqueous Laponite suspensions into soft solids due to the application of a DC electric field. A substantial increase in the speed of solidification at higher...

This work aims at reconsidering several interpretations coexisting in the recent literature concerning non-linear susceptibilities in supercooled liquids. We present experimental results on glycerol and propylene carbonate showing that the three independent cubic susceptibilities have very similar frequency and temperature dependences, both for the...

Thermoresponsive poly(N-isopropylacrylamide) (PNIPAM) particles of a nearly constant swelling ratio and with polydispersity indices (PDIs) varying over a wide range (7.4% - 48.9%) are synthesized to study the effects of polydispersity on the dynamics of suspensions of soft PNIPAM colloidal particles. The PNIPAM particles are characterized using dyn...

Thermoresponsive poly(N-isopropylacrylamide) (PNIPAM) particles of a nearly constant swelling ratio and with polydispersity indices (PDIs) varying over a wide range (7.4%–48.9%) are synthesized to study the effects of polydispersity on the dynamics of suspensions of soft PNIPAM colloidal particles. The PNIPAM particles are characterized using dynam...

This work aims at reconsidering several interpretations coexisting in the recent literature concerning nonlinear susceptibilities in supercooled liquids. We present experimental results on glycerol and propylene carbonate, showing that the three independent cubic susceptibilities have very similar frequency and temperature dependences, for both the...

The dynamics of aqueous Laponite clay suspensions slow down with increasing sample waiting time (t_w ). This behavior, and the material fragility that results, closely resemble the dynamical slowdown in fragile supercooled liquids with decreasing temperature, and are typically ascribed to the increasing sizes of distinct dynamical heterogeneities i...

An aqueous suspension of the synthetic clay Laponite undergoes a transition from a liquid-like ergodic state to a glass-like nonergodic arrested state. In an observation that closely resembles the dynamical slowdown observed in supercooled liquids, the phenomenon of kinetic arrest in Laponite suspensions is accompanied by a growth in the $\alpha$-r...

Photocatalytic degradation of estriol (E3) in an aqueous medium was investigated in the presence of TiO2 microcrystallized glass plates. To begin with, transparent glasses associated with the composition 0.4BaO–0.4TiO2–B2O3 (BTBO) were fabricated by the conventional melt-quench technique and subsequently subjected to controlled heat treatment at an...

By studying a nonlinear susceptibility on supercooled glycerol, we show that applying a static field ${E}_{st}$ increases the glass transition temperature ${T}_{g}$ by an amount quadratic in ${E}_{st}$. This has important consequences: (i) it reinforces the relation between the two paths put forward in the last years to unveil the dynamical correla...

Glasses in the x(BaO-TiO 2)-B 2 O 3 (x = 0.25, 0.5, 0.75, and 1 mol.) system were fabricated via the conventional melt-quenching technique. Thermal stability and glass-forming ability as determined by differential thermal analysis (DTA) were found to increase with increasing BaO–TiO 2 (BT) content. However, there was no noticeable change in the gla...

Nanocrystallization of anatase phase was established in BaO-TiO2-B2O3 glass system. Crystallization kinetics of anatase phase in these glasses were investigated using non-isothermal differential scanning calorimetry (DSC) at three different heating rates (10, 20 & 30 K/min). Scanning Electron Microscopy (SEM) carried out on heat treated (at 920 K)...

High density transparent glasses (7.86 g/cc) were fabricated in the 2Bi{sub 2}O{sub 3}-B{sub 2}O{sub 3} (BBO) system. Optical band gap of the obtained glasses was found to be 2.6eV. The refractive index measured for these glasses was 2.25{+-}0.05 at {lambda}=543 nm. Nonlinear refraction and absorption studies were carried out on the BBO glasses usi...

Sr2SbMnO6 (SSMO) ceramics were, fabricated using the nanocrystalline powders obtained via molten salt synthesis (MSS) method. High temperature X-ray diffraction studies confirmed the structural phase transition (room temperature tetragonal (I4/mcm) to the cubic phase (Pm-3m)) temperature to be around 736K. The discontinuity in the phase transition...

a b s t r a c t Ferroelectric c-oriented Bi 2 VO 5.5 (BVO) thin films (thickness %300 nm) were fabricated by pulsed laser deposition on corning glass substrates. Nonlinear refractive index (n 2) and two photon absorption coef-ficient (b) were measured by Z-scan technique at 532 nm wavelength delivering pulses with 10 ns dura-tion. Relatively large...

Transparent colorless glasses in the ternary BaO–TiO 2 –B 2 O 3 system were fabricated via conventional melt-quenching tech-nique. The glasses with certain molar concentrations of BaO and TiO 2 on heat treatment at appropriate temperatures yielded nanocrystalline phase of TiO 2 associated with the crys-tallite size in the 5–15 nm range. Nanocrystal...

Optically clear glasses in the ZnO–Bi2O3–B2O3 (ZBBO) system were fabricated via the conventional melt-quenching technique. Dielectric constant and loss measurements carried out on ZBBO glasses unraveled nearly frequency (1 kHz–10 MHz)-independent dielectric characteristics associated with significantly low loss (D = 0.004). However, weak temperatur...

Electrical conduction and relaxation phenomena in bismuth borate glasses in the composition 2Bi2O3-B2O3 (Bi4B2O9) were investigated. Dielectric studies carried out on these glasses revealed near constant loss (NCL) response in the 1 kHz to 1MHz frequency range at moderately high temperatures (300-450K) associated with relatively low loss (D=0.006)...

Transparent glasses in the system 0.5Li2O–0.5M2O–2B2O3 (M=Li, Na and K) were fabricated via the conventional melt quenching technique. The amorphous and glassy nature of the samples was confirmed via the X-ray powder diffraction and the differential scanning calorimetry, respectively. The frequency and temperature dependent characteristics of the d...

Transparent glasses in the system 0.5Li2O-0.5K2O-2B2O3 (LKBO) were fabricated via the conventional melt quenching technique. Amorphous and glassy nature of the samples was confirmed by X-ray diffraction and differential scanning calorimetry (DSC) respectively. Complex dielectric and impedance studies were conducted on the samples at different tempe...

Transparent glasses in the system 0.5Li2O-0.5K2O-2B2O3 (LKBO) were fabricated via the conventional melt quenching technique. Amorphous and glassy nature of the samples was confirmed by X-ray diffraction and differential scanning calorimetry (DSC) respectively. Complex dielectric and impedance studies were conducted on the samples at different tempe...

Bismuth vanadate (Bi 2 VO 5.5) thin films were grown by pulsed laser deposition technique on corning glass substrates. The as deposited amorphous films were irradiated by pulsed Nd: YAG laser of 1064 nm wavelength as functions of angle of incidence and laser intensity. Irradiated areas were examined using polarizing microscope which revealed the ex...