No abstract

No abstract

Fabrication of PP/in situ reduced GO nanocomposites with excellent EMI shielding capability realized via a facile and green route.

A thick coating of hierarchically porous double-templated TiO 2 –ZrO 2 –PMMA–PF127 with excellent self-cleaning properties and high transmittance has been developed for the first time on glass substrates using a simple dip-coating technique. Comparative studies of this sample with a thick and transparent coating of single-templated TiO 2 –ZrO 2 –PMMA have been performed to probe the origin of its exceptional properties. The formation of the composites, successful incorporation of the polymer into the matrix, and the porous nature of the films have been studied. The presence of Ti 2+ in the double-templated samples has been confirmed, which suggest the chemisorption of water on the surface of the film. The variation in the self-cleaning properties of the samples on UV-illumination has also been studied. The double-templated film is found to possess the capability of good hydrophilic retention even 2 days after UV-irradiation.

The structural features leading to the intense quenching free luminescence exhibited by europium oxalate nanocrystals, poly[[hexaaquatri-2 -oxalatodieuropium] 4.34-hydrate], {[Eu 2 (C 2 O 4 ) 3 (H 2 O) 6 ]Á4.34H 2 O} n , is the focal point of this report. Europium oxalate nanocrystals were synthesized by a simple microwave-assisted co-precipitation method. Powder X-ray diffraction analysis revealed the monoclinic structure of the nanocrystals and the phase purity. The morphology and particle size were examined by transmission electron microscopy (TEM) analysis. Luminescence measurements on a series of samples of La 2-x Eu x (C 2 O 4 ) 3 Á10H 2 O, with x varying in the range 0.1 to 2, established the quenching free nature exhibited by the europium oxalate nanocrystals. A singlecrystal structure analysis was carried out and the quenching free luminescence is explained on the basis of the crystal structure. A detailed photoluminescence characterization was carried out using excitation and emission studies, decay analysis, and CIE coordinate and colour purity evaluation. The various spectroscopic parameters were evaluated by Judd-Ofelt theoretical analysis and the results are discussed on the basis of the crystal structure analysis. research papers Acta Cryst. (2019). C75, 589-597 Alexander et al. Quenching free luminescence of europium oxalate nanocrystals 597