Bu-Ali Sina University

About: Bu-Ali Sina University is a education organization based out in Hamadan, Hamadān, Iran. It is known for research contribution in the topics: Catalysis & Adsorption. The organization has 4078 authors who have published 7969 publications receiving 122828 citations.

Turn-off fluorescence of amino-functionalized carbon quantum dots as effective fluorescent probes for determination of isotretinoin

Abstract: Amino-functionalized carbon quantum dots (N-CQDs) as effective fluorescent probes were synthesized by a facile one-pot hydrothermal method via gluconic acid and N-methylethylenediamine as carbon and nitrogen sources respectively. Then the N-CQDs were applied to determine isotretinoin (INN). The synthesized N-CQDs were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), dynamic light scattering (DLS), Fourier-transform infrared spectroscopy (FT-IR), UV-vis absorption and photoluminescence spectroscopy. As the emission of N-CQDs is efficiently quenched by INN, the as-prepared N-CQDs are employed as a highly sensitive and selective probe for INN detection. Under the optimal conditions, linear response was observed in the range of 0.08–70.0 μmol L −1 for INN determination. The calculated detection limit was 0.03 μmol L −1 . The established method showed a good selectivity for INN among several kinds of ions and biomolecules. The results of this study showed that the as-synthesized N-CQDs could be successfully applied to determine INN in blood serum and pharmaceutical samples.

Effects of steel fibre and silica fume on impact behaviour of recycled aggregate concrete

Abstract: This paper presents the effects of silica fume and steel fiber on the mechanical properties and impact behavior of recycled aggregate concrete containing two types of recycled coarse aggregates (RCAs). In total, 20 series of concretes are considered and they are divided into 4 groups. The first group consisted of 1 control concrete containing natural coarse aggregate and 4 control recycled aggregates concretes containing 50 and 100% RCA of two types (A and B). The second and third series are similar to the first series in every aspect except the former contained 8% silica fume as partial replacement of ordinary Portland cement and the latter contained 1% steel fiber by volume. In the fourth series, both 8% silica fume and 1% steel fiber are used. Compressive and split tensile strengths of all concretes are measured in terms of mechanical properties evaluation and low velocity impact hammer test is conducted to evaluate the impact behavior of all concretes. Results show that the concrete containing RCA obt...