The reaction of γ-alumina with tetraethylorthosilicate (TEOS) vapor at low temperatures selectively yields monomeric SiO(x) species on the alumina surface. These isolated (-AlO)3Si(OH) sites are characterized by PXRD, XPS, DRIFTS of adsorbed NH3, CO, and pyridine, and (29)Si and (27)Al DNP-enhanced solid-state NMR spectroscopy. The formation of isolated sites suggests that TEOS reacts preferent...

Amino-functionalised metal-organic frameworks UiO-66 and -67 were post-synthetically modified with salicylaldehyde. A molybdenum complex was immobilised on the resulting materials. They were characterised by (13)C-MAS-NMR, XPS and PXRD to confirm immobilisation and stability. The immobilised complex is an active and reusable catalyst for olefin epoxidation with tert-butyl hydroperoxide (TBHP) a...

Quantitative analysis by powder X-Ray diffraction (Q-PXRD) is hardly ever carried out by simple or obvious methods. Although the theory has been well established for some time (Clark, 1936; Alexander et al., 1948; Chung, 1974, 1975; Brindley, 1980; Bish et al., 1988; etc.), in practice imprecise results are obtained because of experimental oversimplification usually introduced as a result of th...

To assess the application potential of novel biomaterials, their behaviour in model media and upon sterilization should be investigated, as well stability related to storage conditions. Such data are lacking for Mg-substituted HAP (Mg-HAP). Therefore, changes local structure non-substituted Mg-HAP after irradiation immersion corrected simulated fluid saline solution 28 days were followed by ele...

Pendahuluan: Karbamazepin termasuk ke dalam golongan Biopharmaceutical Classification System (BCS) kelas II yang artinya bahwa karbamazepin memiliki permeabilitas membran tinggi dan kelarutan rendah. Rekristalisasi merupakan salah satu cara untuk memodifikasi kristal upaya mengubah sifat fisikokimia laju disolusi obat. Tujuan: Penelitian ini bertujuan mengevaluasi melalui rekristalisasi berbaga...

Traditional techniques for stereochemistry analysis have limitations; for example solution NMR spectroscopy has spatial limitation for the transference of stereochemical information, and suitable single crystals for X-ray analysis may not be available. Residual dipolar coupling (RDC) and powder X-ray diffraction (PXRD) are both techniques whose use is not yet widespread. We report a double-blin...

EaStCHEM School of Chemistry, The Unive Edinburgh, EH9 3FJ, UK. E-mail: E.Brec [email protected] UK National Crystallography Service, C Higheld Campus, Southampton, SO17 1BJ Instituto de Ciencia de Materiales de Aragón Departamento de Física de la Materia Cond School of Chemistry, The University of Ma 9PL, UK. E-mail: eric.mcinnes@manchester. Department of Chemistry, University of Cop Copenhagen,...

The stabilities and hydrocarbon/fluorocarbon sorption properties of a zeolite-like metal-organic framework (MOF) Zn(hfipbb) with fluorinated channels has been studied. By the combination of thermogravimetric analysis (TGA) and powder X-ray diffraction (PXRD) measurements, we confirm that Zn(hfipbb) has exceptionally high hydrothermal and thermal stabilities. The adsorption behaviors of water an...

ABSTRACT. Nonlinear optical (NLO) active guanidinium trichloroacetate (GTCA) crystal was synthesised and grown by using slow evaporation solution growth technique from mixed solvent. The characterized single X-ray diffraction (SXRD) powder (PXRD) analysis. Fourier transform infrared (FTIR) spectrum of GTCA recorded the frequency assignments various functional groups were compared with theoretic...

The objective of the present study was to demonstrate that a novel hydroxypropyl-β-cyclodextrin functionalized calcium carbonate (HP-β-CD/CC) based amorphous solid dispersion (ASD) can be used to increase the solubility and oral bioavailability of water-insoluble drugs. Irbesartan (IRB) was selected as a model compound and loaded into the nanoporous HP-β-CD/CC matrix using an immersion method. ...