B. Rajeswari
@clri.org
Central Leather Research Institute India
Scopus Publications
Scopus Publications
M. Malathi, A. V. Kiruthika, B. Valarmathi, B. Rajeswari, V. Muthulakshmi, and P. Palanisamy
Springer Science and Business Media LLC
M. Malathi, R. Kaliammal, B. Valarmathi, B. Rajeswari, V. Muthulakshmi, K. Vinoth, and S. Sambasivam
Elsevier BV
B. Rajeswari, B. Sravani, Michael Cheffena, Ramavath Janraj Naik, Y. Veera Manohara Reddy, G. Madhavi, K.V.N. Suresh Reddy, and Myung Jong Kim
Elsevier BV
B. Rajeswari, K. V. S. Reddy, S. Devi, G. Madhavi and I. V. S. Reddy
AMG Transcend Association
In the present study, the electrochemical behavior of uric acid (UA) was evaluated using a titania nanoparticle (TiO2) coated glassy carbon electrode (GCE). TiO2 nanoparticles are synthesized and characterized using Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray Analysis (EDX) techniques. The electrochemical behavior of uric acid on both bare GCE and Titania coated GCE electrodes were studied through differential pulse voltammetry. Titania-coated GCE showed a higher current at the lower potential for the oxidation of uric acid when compared to bare GCE. The sensor's improved electrocatalytic activity was observed to detect uric acid in a 0.1 M phosphate buffer saline (PBS) solution at pH 7.0. A good linear relationship was observed between electrical response and the concentration of uric acid in the range of 1 to 9 μM. Under optimized experimental conditions, the limit of detection (LOD) was found as 0.764 μM. The sensor has expressed considerable sensitivity towards UA detection without interference and is successfully used to determine UA in human urine samples.
B Rajeswari, N Malarvizhi, Dhanasekaran Prakash, and Sellamuthu N Jaisankar
SAGE Publications
Melt polymer nanocomposites were prepared using polyvinyl alcohol (PVA) with the different weight percentage of calcined clays (CCs) in a twin-screw extruder at 210°C and 70 r min−1 for 8 min. Bentonite was surface functionalized with benzidine using dilute hydrochloric acid at 60°C and calcined at 600°C for 6 h. The CCs were incorporated into the PVA matrix to study their morphology and rheological properties. The melt viscosities of the composites were measured by the cone-plate rheometer, the rheogram show non-Newtonian and thixotropic flow behavior. Scanning electron microscope confirmed the degree of exfoliated nanocomposites. The polymer and functionalized nanoclay interactions were reflected in the enhancement of thermal stability and mechanical properties. The melting endotherm temperature ( T m) and glass transition temperature ( T g) of the nanocomposites tend to increase with increase in weight percentage of the calcined nanoclays. Thermal properties show that addition of calcined nanoclays would improve the thermal decomposition temperatures from 295°C to 307°C when CC content was 2 wt% in covalent or ionic bonding system.
B. Rajeswari, N. Malarvizhi, E. Deenadayalan, and Sellamuthu N Jaisankar
Informa UK Limited
ABSTRACT Polyvinyl alcohol-based nanocomposites filled with different weight percentage of functionalized nanoclays were prepared by melt processing with a twin-screw extruder. The effective incorporation of amine-modified bentonite nanoclays in the PVA matrix leads to the increase in thermal stability, stress–strain properties. The effect of the addition of functionalized nanoclays in PVA matrix exhibits intercalated nanocomposite structure. The thermal decomposition (Td) temperature of the composites increases up to 30°C, than pristine PVA. The morphology influences were studied by TEM. These clay nanocomposite films could be useful for wound dressing material and for enhancing the moisture absorbance properties. GRAPHICAL ABSTRACT