Metal-organic framework assisted synthesis of Zr-modified SAPO-34 zeolites with hierarchical porous structure for catalysis transformation of methanol-to-olefins

To introduce the hierarchical porous structure into SAPO-34 zeolites, adjust acid properties and crystalline size of SAPO-34 zeolites, a series of Zr-modified SAPO-34 zeolites (Zrx-SAPO-34 (x = 0.25, 0.50 and...

Effect of Radiation of Moon on the physical property of Jalkhumbhi (Water hyacinth) Bhasma as a functional nanomaterials for its applications as medicine and in other areas of Science & Technology

Jalkhumbhi Bhasma as Nanomaterials is prepared using ecofriendly green approach in Pushya nakshtra and Rohini nakshtra. The crystal structure was evaluated, using modern scientific tools. X-ray diffaraction measurement shows that crystalline size and lattice constant of Jalkhumbhi bhasma prepared in Push and Rohini nakshtra were found, 26.62 nm and 54.55 nm and lattice constant 6.312A, 6.301A and respectively. This reveals the effect of radiation of moon alter the crystal structure. The Fourier transform infrared spectroscopy(FTIR) measurement shows functional group present in the materials are of the compound of K, Cl, C-Cl, NH2, C-O-C, C=O, Ca, and Ca(OH)2 respectively. The magnitude of force constant between the atoms are 2.51307 N/cm, 4.16005 N/cm and 2.61932 N/cm, 4.20074 N/cm respectively in both the nakshtras, which measure the interatomic strength. The photoluminescence spectra (PL) reveals that the broad emission of radiation spectrum from both the materials lie in the visible region, showing broad blue emission. The energy band gap value for the most significant intense peak corresponding to 481 nm (2.55 eV) corresponding to 350 nm excitation of radiation and 501 nm (2.475 eV) for 370 nm. The optical property shows that prepared Jalkhambhibhasma may be useful as semiconductor electronics nanomaterials, which were prepared using eco-friendly approach. This may open a new window for material science and pharmaceutical sectar for the production of such materials for electronic based industries, in addition, to using as an evidence based medicine. The effect of natural radiation of moon changes the crystal structure and properties of materials, which are beneficial for health as well as in other areas of science and technology due to its crystalline size and optical properties.

Influence of W Addition on Microstructure and Resistance to Brittle Cracking of TiB2 Coatings Deposited by DCMS

The aim of this work was to determine the influence of the tungsten addition to TiB2 coatings on their microstructure and brittle cracking resistance. Four coatings of different compositions (0, 7, 15, and 20 at.% of W) were deposited by magnetron sputtering from TiB2 and W targets. The coatings were investigated by the following methods: X-ray diffraction (XRD), transmission electron microscopy (TEM), atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). All coatings had a homogeneous columnar structure with decreasing column width as the tungsten content increased. XRD and XPS analysis showed the presence of TiB2 and nonstoichiometric TiBx phases with an excess or deficiency of boron depending on composition. The crystalline size decreased from 27 nm to 10 nm with increasing W content. The brittle cracking resistance improved with increasing content of TiBx phase with deficiency of B and decreasing crystalline size.

Study of Surface Morphology and Porosity of Composite Scaffold Nanofiber PVA/CS/HA with Electrospinning Method

This research aims to compose nanofibers as a scaffold material in bone tissue engineering in terms of surface morphological properties and porosity. HA nanorod was prepared by the precipitation-ultrasonication method, while the PVA/CS/HA nanofiber composites were made by the electrospinning method using a static collector. HA was characterized by using XRD and SEM-EDX, while the PVA/CS/HA nanofiber composites used FTIR and SEM. The results show that HA nanorod has a crystalline size of 10.86 nm, crystallinity level of 52.38 per cent, and Ca/P ratio of 1.70. From the SEM image shows HA nanorod width of 11.6 nm and 97.53 nm in length and some of it still in the form of HA nanoparticles. The diameter and porosity of PVA/CS/HA nanofiber with addition of 0, 10, 20 per cent HA were 275, 212, 265 nm and 72.94, 69.49, 70.81 per cent, respectively.

GREEN SYNTHESIS OF SILVER NANOPARTICLES USING ROASTED COFFEA ARABICA BEAN EXTRACT AND ITS ANTIMICROBIAL ACTIVITY

An extract obtained from roasted Coffea arabica bean was used as bio-reductant and mixed with standard AgNO3 (0.1M) solution. The formation of silver nanoparticles(AgNP) was observed by the change in the colour of the solution (coffee extract + AgNO3) from brown to blackish brown. UV-vis spectrophotometry analysis showed maximum adsorption at 240nm. The SEM analysis showed the morphology of the AgNPs as oval and spherical and the sized of the particles between the range of 25nm to 51nm. The crystalline size of the AgNPs was analyzed between the range of 10nm to 30nm employing XRD technique. The antimicrobial activity study of the synthesized silver nanoparticles showed zone of inhibition against the clinically important bacteria namely- E coli, Pseudomonas, Klebsiella, Staphylococcus and Bacillus.

Size modulation of MIL-125 nanocrystals to promote the catalytic performance towards oxidative desulfurization

The Ti-based metal-organic framework (Ti-MOF) MIL-125 with tunable crystalline size in the range of ca. 50 nm to 1500 nm was synthesized by coordination modulation method using trans-cinnamic acid (CA)...

Regulating the size and acidity of SAPO-34 zeolites using dual templates to enhance the selectivity of light olefins in MTO

To understand relationship of catalytic performance with crystalline size and acidity of SAPO-34 zeolites better, a series of SAPO-34 zeolites were prepared by hydrothermal crystallization using palygorskite as silicon and...