in this work, we studied the effect of carboxylic acid on the rheological properties of a high-alumina cement mortar (ch45) produced by the algerian firm refractal.the investigated properties are setting time, water consumption, electrical conductivity, ph, density and the compressive strength. the results show a setting time of about 200 min for the acid free, 180 min with 0.1 % of carboxylic ...

Nearly monodispersed yolk-type Au@Fe3O4@C nanospheres with hollow cores of 50 nm in diameter were prepared through coating Au@SiO2 nanoparticles with Fe3O4@C double layers, followed by dissolving SiO2. The cytotoxicity of the nanospheres was evaluated by MTT assay, demonstrating a high biocompatibility. The yolk-type nanospheres show a high DOX loading content of 1237 mg g(-1). The coexistence ...

Ge nanocrystals embedded in SiO2 matrix P. K. Giri, S. Bhattacharyya, Satchi Kumari, Kaustuv Das, S. K. Ray, B. K. Panigrahi, and K. G. M. Nair Department of Physics and Centre for Nanotechnology, Indian Institute of Technology, Guwahati 781039, India Department of Physics and Meteorology, Indian Institute of Technology, Kharagpur 721302, India Materials Science Division, Indira Gandhi Center f...

Functionalized Fe nanoparticles (NPs) have played an important role in biomedical applications. In this study, metallic Fe NPs were deposited on SiO2 spheres to form a Fe/SiO2 composite. To protect the Fe from oxidation, a thin SiO2 layer was coated on the Fe/SiO2 spheres thereafter. The size and morphology of the SiO2@Fe/SiO2 composite spheres were examined by transmission electron microscopy ...

Objective(s): Quince seed mucilage (QSM) serves as a new source of hydrocolloid which extracted from outer pericarp of Cydonia oblonga seeds upon wetting. It has been traditionally used for the treatment of diseases such as pharyngeal disorder, common cold, colic ulcer, and diarrhea. The aim of the present study was to evaluate the physico-mechanical and antimicrobial properties of quince seed ...

Silica (SiO2) nanoparticles are being progressively applied in various applications, including cosmetics, food technology, and medical diagnostics. Although crystalline SiO2 is a known carcinogen, the carcinogenicity of SiO2 nanoparticles remains unclear. Here, we assessed the cytotoxic effects and DNA injury induced by exposure to various dosages of SiO2 nanoparticles at 0-2400 mg/mL (0-3200 m...

In recent years, luminescent materials doped with Ln(3+) ions have attracted much attention for their application as optical thermometers based on both downshifting and upconversion processes. This study presents research done the development of highly sensitive in physiological temperature range poly(methyl methacrylate) (PMMA) films two series visible complexes (Ln(3+)=Tb3+, Eu3+, Sm3+) SiO2 ...

The charge-trapping characteristics of Ga2O3 (Gd2O3 ) (denoted as GGO) with and without nitrogen incorporation were investigated based on Al/Al2O3 / GGO/SiO2 /Si (metalalumina-nitride-oxide-silicon) capacitors. Compared with the capacitor without nitrogen incorporation, the one with nitrided GGO showed a larger memory window (10 V at ±16 V, 1 s), a higher program speed with a low gate voltage (...

Incorporation of copper species into silica matrix was performed by the sol-gel method. Copper ions and copper particles were doped using two different copper sources; Cu(NO3)2.3H2O and copper particles chemically synthesized.The particles of copper metallic, cuprous and cupric oxide were prepared and the synthesis and characterizations of copper species were compared together. On the other han...