Semiconductor nanoparticles have a range of potential applications in electronic, optoelectronic and spintronic devices. Zinc oxide (ZnO), a wide-bandgap semiconductor, has emerged as an important material for such applications. In this work, impurities in ZnO nanoparticles were investigated with infrared (IR) spectroscopy, and the results show the presence of CO2 impurities in ZnO nanoparticle...

The influence of operating conditions to the effectiveness of extractive distillation process was investigated by using the method of gas chromatography. The experiment took place on an industrial vacuum plant of purification ethanol from impurities formed during fermentation. It is obtained that the concentration of different micro impurities at the selection zones depends on the temperature a...

Kaolin samples from Al-Disi kaolin deposits in southeastern region of Jordan are associated with mineral impurities, which impart color to this kaolin and adversely affect its application in paper and paint industries. The associated mineral impurities with kaolin were separated by deflocculating of kaolin particles in polymeric sodium polyphosphate solution. The crude kaolin, deflocculated kao...

Molasses exhaustion has been investigated in South Africa since 1949, and Bruijn et al. (1972) applied a laboratory exhaustion procedure which has since been used extensively (Rein and Smith, 1981). The same approach and equipment have been used to investigate the effect of selected impurities on molasses exhaustion. These impurities include fructose, glucose, inorganic ash constituents, such a...

We study the dynamics of island nucleation in the presence of adsorbates using kinetic Monte Carlo simulations of a two-species growth model. Adatoms (A-atoms) and impurities (B-atoms) are codeposited, diffuse and aggregate subject to attractive AAand AB-interactions. Activated exchange of adatoms with impurities is identified as the key process to maintain decoration of island edges by impurit...

A novel stability-indicating reverse phase high performance liquid chromatography method was developed and validated for the simultaneous determination of Celecoxib (CEL) and Diacerein (DIN) and its impurities in capsule dosage form. The method was developed using L1 column with gradient using the mobile phase consist of Solution A (pH = 2.3 buffer) and Solution B (methanol and acetonitrile; 50...

We study the effects of the RKKY interaction between magnetic impurities on the mesoscopic conductance fluctuations of a metal ring with dilute magnetic impurities. At sufficiently low temperatures and strong magnetic fields, the loss of electron coherence occurs mainly due to the scattering off rare pairs of strongly coupled magnetic impurities. We establish a relation between the dephasing ra...

We report first-principles studies of hydrogen-related point defects and impurities in LiBH4 and Li4BN3H10, two promising materials for hydrogen storage. In both systems, hydrogen vacancies and interstitials are found to be positively or negatively charged, and hence their formation energies are Fermi-level dependent. One can therefore tailor the formation energies of these point defects hence ...