A high-performance symmetric supercapacitor was fabricated using a Na 0.33 V 2 O 5 nanocomposite synthesized by means of a simple co-precipitation technique. The structural and morphological investigation showed that the synthesized Na 0.33 V 2 O 5 nanocomposite exhibited a monoclinic structure with a nanorod-like morphology. The electrochemical properties of the Na 0.33 V 2 O 5 symmetric supercapacitor were studied utilizing three different aqueous electrolytes, such as 1 M of LiCl , NaCl and KCl, respectively. Interestingly, the fabricated Na 0.33 V 2 O 5 symmetric supercapacitors exhibited excellent electrochemical capacitance behaviour in all the electrolytes with a maximum specific capacitance value of 168 F g À1 in 1 M LiCl, 146 F g À1 in 1 M NaCl and 132 F g À1 in 1 M KCl electrolytes at 0.5 A g À1 discharge current density. In addition, Na 0.33 V 2 O 5 symmetric supercapacitors demonstrated an excellent cyclic stability in 1 M NaCl electrolyte with high capacitance retention of approximately 81 % after 50 000 charge/discharge cycles.

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We evaluated the efficiency of an air purifier using the single-chamber method for the effective removal of airborne Staphylococcus epidermidis, a nosocomial infection-causing bacterium. In this experiment, the bacterial strain S. epidermidis was injected using a nebulizer into the test chamber, which was similar to a consumer living space (60 m 3 ). The microbial sampling was conducted via the air sampler method, and the reduction in S. epidermidis growth was monitored by performing three consecutive tests. Initially, a blank test was conducted to determine the natural decay rate and calibrate the experimental setup. After injecting the bacterial strain from 1240 to 11180 CFU per unit volume (m 3 ), the natural decay rate showed a maximum deviation of 3.1% with a sampling error of 1.1% p at a confidence level of 95%. In addition, the particle size distribution in the test chamber was found to range from 0.3 to 5.0 μm, and a subsequent decrease in large-sized particles was observed with the operation of the air purifier, which is the size similar to that of suspended airborne bacteria. This can be used to assess the performance of the air purifier by calibrating the natural reduction value to the reduced operation value. Thus, the single-chamber technique is a promising approach for analyzing the removal efficacy of airborne bacteria from indoor air.

The biodegradable poly(butylene adipate‐co‐terephthalate) (PBAT) polymer was synthesized via one pot synthesis technique using adipic acid and butanediol. The polymerization of synthesized sample was confirmed using FTIR, NMR, and TGA analysis. The PBAT/ATO films were fabricated via spray coating technique utilizing various concentrations of ATO nanoparticles in PBAT polymer solution and optimized the film quality through optical (NIR) and surface analysis. The polymer film having 7 wt % of ATO in PBAT showed good transparency in the UV, visible light and shown approximately 41% absorption in the near infrared region. Moreover, the 7 wt % ATO based polymer film exhibited low surface roughness and uniform coating over the substrate. In addition, near infrared absorbing efficiency of PBAT/ATO composite film in outdoor was demonstrated by constructing a PBAT/ATO (7 wt %)/vinyl greenhouse and the temperature differences were comparatively studied with a bare vinyl green house.

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