The present study describes the green synthesis of ZnO nano-sized spherical particles (ZnO-NPs) using aqueous fruits extract of Terminalia chebula. The Structural, morphological and optical properties of green-synthesized ZnO-NPs are characterized by X-ray diffraction, Fourier transform infrared, field emission-scanning electron microscope, ultraviolet-visible and photoluminescence spectroscopy techniques. The results show that the synthesized nanoparticles have stable hexagonal wurtzite structure, and roughly spherical in shape. To explore the photocatalytic activity of the ZnO-NPs the photocatalytic degradation of rhodamine B (RhB) dye is investigated. The results reveal that ZnO-NPs prepared through green synthesis route are found to be efficient in the degradation of RhB dye.

Carbon quantum dots (CQDs) were synthesized in this study by hydrothermally treating cow milk. The procedure is simple, non-hazardous to the environment, and does not necessitate the use of any special instruments or chemicals. CQDs were practically almost circular when they were manufactured and had an average size of 7 nm. Carbon (67.36%), oxygen (22.73%), and nitrogen (9.91%) comprised the majority of their composition. They feature broad excitation-emission spectra, excitation-dependent emission, and temperature-dependent photoluminescence. They remained quite stable in the presence of a lot of salt, UV radiation, and storage time. Because luminescence quenching mechanisms are sensitive to and selective for Sn2+, they can be employed to create a nanosensor for detecting Sn2+.

Dielectric properties of ferroelectric liquid crystalline mixture FLC-6980 and its anthraquinone dye (2% wt/wt) doped sample have been studied in SmC* and SmA phases in the frequency range from 100 Hz to 1 MHz in planar and homeotropic aligned cells. We observed the molecular relaxation mode in the homeotropically aligned cell at 33 °C at a frequency of 36 kHz in the SmC* phase. In the planar cells, goldstone and a new relaxation mode have been observed. A soft mode appeared in the vicinity of the SmC*-SmA transition. The dielectric increment, distribution parameter and relaxation frequency of these modes have been evaluated at different temperatures and bias voltages. Our results are in agreement with the extended Landau model.

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