نتایج جستجو برای: solgel synthesis
تعداد نتایج: 409304 فیلتر نتایج به سال:
Erbium/ytterbium-dopped Y0.9Er0.1−xYbxVO4 samples with x = 0, 0.01, 0.05 and 0.09 were synthesized by hydrothermal synthesis at basic pH urea addition. For comparison purposes, another sample 0 was also prepared the solgel method. X-ray diffraction patterns indexed on basis to a tetragonal symmetry of space group I41/amd Z 4 compatible zircon-type, in good agreement FTIR spectra. Additionally, ...
A number of polymers used in the production of carriers for drug delivery applications, possessing high surface area, appropriate surface chemistry and porosity, chemical stability and low cost have been investigated. One of these promising candidates are natural polysaccharides such as alginic acid sodium salt, guar gum, xanthan gum and chitosan due to their outstanding merits. They are simila...
We present time-resolved photoluminescence studies in conjunction with device characterization of a variety of heterojunctions with poly-(3-hexylthiophene), or P3HT, as a means to understand how exciton dynamics affect device performance. We find that blends of P3HT with the electron-transporting polymer CN-ether-PPV and with the fullerene derivative PCBM result in ~4-fold and ~15-fold improvem...
absorption spectra of the composite sol-gel (blue solid) and pure photochromic sol-gel (black solid). The open-form ∆OD for composite solgel (red dash). The inset is the chemical structure of the composite molecule with donor moiety (bottom red) and acceptor moiety (top blue). (d) The thermally reversing photokinetic measurement of the open-form ∆OD (460nm) of the composite sol-gel, recovering ...
we used dbsa and nano-magnetic for the synthesis of amido alkylnaphtols.
in this thesis, we exploit a simple and suitable method for immobilization of copper(ii) complex of 4?-phenyl-terpyridine on activated multi-walled carbon nanotubes [amwcnts-o-cu(ii)-phtpy]. this nanostructure was characterized by various physico-chemical techniques. to ensure the efficiency and fidelity of copper species, the implementation of three-component strategies in click-chemistry all...
in this thesis, a better reaction conditions for the synthesis of spirobarbiturates catalyzed by task-specific ionic liquid (2-hydroxy-n-(2-hydroxyethyl)-n,n-dimethylethanaminium formate), calcium hypochlorite ca(ocl)2 or n-bromosuccinimide (nbs) in the presence of water at room temperature by ultrasonic technique is provided. the design and synthesis of spirocycles is a challenging task becaus...
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