Báo cáo vật lý: "FORMATION AND MORPHOLOGY OF COLLOIDAL CHITOSAN-STABILIZED COPPER SULFIDES" pdf

... Figure 5: Raman spectrum of CuS nanoparticles Journal of Physical Science, Vol. 18(1), 87–101, 2007 87 FORMATION AND MORPHOLOGY OF COLLOIDAL CHITOSAN-STABILIZED COPPER SULFIDES H.T. Boey, ... confirmed these copper sulfides. The effects of chitosan on the morphology of the copper sulfides were studied via TEM and SEM microscopy. In the absence of chitosan...

Ngày tải lên: 07/08/2014, 14:20

... the bulk (grain) property of the material arising due to the parallel combination of bulk resistance (R b ) and bulk capacitance (C b ) of the material. The capacitance of the sample is about ... Figure 9 shows the plots of real part of complex permittivity of BiTaO 4 ceramics as a function of sintering temperature. The ε r increases appreciably with the increase of...

Ngày tải lên: 07/08/2014, 14:20

... strength of the E/GF composites with the addition of silane- treated OMMT. According to Lin et al., 5 the clays were dispersed between both the bundles of GF and within the interstices of the ... reaction uses alkoxysilanes and exploits the -OH reactive sites of the MMT structure. In this research, we investigate the mechanical and morphological properties of E/GF/3- ami...

Ngày tải lên: 07/08/2014, 14:20

... reveal that a double molar ratio of urea and an equimolar of oxalic acid produced PEILs. PEILs were successfully formed by using combinations of hydrochloride salts and complexing agents. HCl acts ... systems. The physical and chemical properties of PEILs are congruent to those of the traditional ILs, but the range of structures for PEILs is likely to be different from t...

Ngày tải lên: 07/08/2014, 14:20

... reproducibility characters of the method yield relative standard deviation (RSD) of 0.44% and 0.94% for Pb(II) and Cd(II), respectively. The limit of detection of the method for Pb(II) and Cd(II) was calculated ... standard solution (1000 mg/l) of Pb(II) and Cd(II) was prepared by dissolving 1.1261 g of Pb(NO 3 ) 2 (Fluka AG) and 1.0271 g of Cd(NO 3 ) 2 . 4H 2 O (...

Ngày tải lên: 07/08/2014, 14:20

... used as a source of heat energy for cooking. 7 Due to the growth of the importance of oilseeds in the national economy of Sudan, the high demand to look for a new source of oil and the sufficient ... 2.1 Seed Characteristics and Composition Seed color was determined visually. One hundred seeds of each type were picked randomly and weighed, dehulled and then, hull...

Ngày tải lên: 07/08/2014, 14:20

... phase of standard BaNd 2 Ti 5 O 14, ICDD No 33–136. The lattice parameters of the XRD show a = 12.20 Å, b = 22.35 Å and c = 3.84 Å. However, detailed observation shows the presence of extra ... composed of a major phase, BaNd 2 Ti 5 O 14 , with some secondary phases, Nd 2 Ti 2 O 7 and BaTi 4 O 9 . The formation of the secondary phases affects the density, dielectric proper...

Ngày tải lên: 07/08/2014, 14:20

... between ketones and alkanols. The subsequent formation of new hydrogen bonds between the proton acceptor oxygen atoms of the group of DMF and the proton of the – OH group of 1- alkanols 17 ... subsequent formation of (new) H-bonds [C=O … H–O] between the proton acceptor oxygen atom (with lone pair of electrons) of the C=O group of DMF and the proton of the OH g...

Ngày tải lên: 07/08/2014, 14:20

... of Si, SiO 2 and Ge for increasing transmittance of Si as active medium in the far red region of 720–750 nm. This paper reports the design and simulation of the transmissivity of single and ... conclusions: the transmissivity of ~ 720–750 nm emission of silicon is affected significantly by the single and multilayer thin film coatings of Ge, SiO 2 and Si/SiO 2 /ai...

Ngày tải lên: 07/08/2014, 14:20

... (1) the formation of clusters composed of C 60 molecules via self-assembly and (2) the reinforcement of the clusters. Firstly, clusters such as fibres and helices composed of C 60 molecules are ... volume of the supercritical fluid chamber made of aluminium was 11.7 ml. Of the crystals composed of C 60 molecules, 0.2 mg was placed on the sur- face of a silicon plate set...

Ngày tải lên: 21/06/2014, 06:20