Abstract: Removed due to plagiarism. The original paper was published as http://onlinelibrary.wiley.com/doi/10.1002/1521-3765%2820001117%296:22%3C4082::AID-CHEM4082%3E3.0.CO;2-S/abstract
Abstract: Ultrafine TiO2 powders as rutile and anatase phase were simply precipitated at room
temperature for only tens of hours by simply controlling the pH value and Ti4+ concentration via
aqueous TiCl4 solution. Under the optimal pH value and Ti4+ concentration, the average particle size
of powders with rutile phase was 3.7nm, while that of powders with anatase phase was 3.0nm. The
average particle size was calculated from the broadening of corresponding X-ray spectral peaks by
Scherrer formula. In addition, 3.0 mol.l-1 are suggested to be used as concentration of stock solutions
instead of the current concentration 2.0 mol.l-1.
Abstract: large-scale and elegant one-dimension tubular nanostructure TaS2, have been generated
successfully employing solid-phase reaction growth with tantalum and sulfur powders. Detailed
experimental procedures, and the characterization of associated product, have been evaluated using
transmission electron microscopy (TEM) and other techniques. The results show that the reaction
yielded a lot of one dimension nanostructures of TaS2 with average diameter of one hundred
nanometers and length of several micrometers (or several ten micrometers). Moreover, effect of
TaS2 nanostructure, as additive in commercial lubricating oil T40, was initially measured by UMT
Multi-specimen Test System (UMT-2). The results show, as additive, antiwear and bearing weight
ability of 1-D TaS2 nanostructure, excelled ordinary lubricating oil at atmosphere.
Abstract: Constant current plus pulse current electrical sintering was introduced into the sintering
of a ball-milled nanocrystalline Fe-2Cu-2Ni-1Mo-0.8C mixed powder. Effect of pulse current
charging time on the properties of sintered products was studied. Constant electric current sintering
was also used for comparison. A nanostructured iron-based material was obtained within 4 minutes
of sintering. It has a density of 7.7 g/cm3 (relative density of 98.7 %) with an average grain size
(iron-matrix) of 58 nm and carbide particle size of less than 100 nm, a hardness of HRC 64 and
transverse rupture strength of 2004 MPa. When only pulsed electric current sintering was used with
a sintering time of 5 min, a fine grained iron-base material with density of 7.74 g/cm3 (relative
density of 99.2%), a hardness of HRC 65 and transverse rupture strength of 2045 MPa was obtained.
Abstract: The chitosan scaffold we prepared have a high porosity of about 90% with pore sizes
from 50 to 200m. Lactose was conjugated onto the inner surface of the highly porous chitosan
scaffold. It was used as substrate for rat hepatocytes culture. The cell attachment ratio was much
higher than on monolayer membrane and non-modified porous scaffold. Metabolic activities of the
cells were evaluated in terms of albumin secretion and urea synthesis. It was found that hepatocytes
cultured on the modified scaffolds showed an increase in albumin secretion during the first 4 days
and were more stable than that on non-modified scaffold. The results showed that the microstructure
of porous scaffolds provides large surface for cells to adhere and facilitates nutrient and oxygen
transportation. Such lactose modified scaffold has a potential application in bioartificial liver
Abstract: On the basis of the Landau-Ginzburg models established by Falk and other authors, a
new model for martensitic transformation in nanograined powder is developed, in which the
influence of the interface on martensitic transformation in nanograined powder is considered. The
interface strain coefficient K, the factor describing the difference of the strain between the interface
and the core of a nano-grain, was suggested in this paper. The equation in the present model was
solved numerically, and the size effect was observed. The calculation results show that the critical
size increases with the drop in temperature, which means that the lower temperature will promote
martensitic transformation in nanograined materials.
Abstract: In order to prolong the service life of Aluminum alloy die casting dies, different surface
treatments were adopted to avoid melting loss on the surface of the dies. In this paper, the dynamic
melting-loss properties of H13 steel were compared among non-treatment, vapor oxidation treating,
carbonitriding and composite treatment of nitirding and vapor oxidation in liquid aluminum of
ADC12 at 700 °C by the weight loss method. The surface structures of the specimens after
treatments were analyzed by the optical microscopy (OP); the patterns of specimens on the surface
were observed by measuring microscope and the melting-loss characteristics of specimens with
different treatment were analyzed. The results showed that the melting-loss property was heightened
obviously by different surface treatments; especially the melting-loss property of the specimens
with composite treatment of nitirding and vapor oxidation was the best.
Abstract: Protein expression of growth factors involved in fracture healing and osteoporosis were
investigated in ovariectomised (OVX) rat fracture model using histological and
immunohistochemical analysis. The OVX model was confirmed by a significantly increased body
weight and reduced bone density of the non-fracture hind limbs. The tissue morphology and the
protein expression were assessed on the paraffin sections of the fracture callus at day 7, 14, 28 and
42 after fracture. Histology revealed a significantly higher ratio of fibrous tissue over bone or
cartilage over bone in the fracture callus at day 28 and 42 in the OVX rats than in the normal rats.
Immunohistochemical staining of IGF-I, IGF-IRα, MMP-1, TIMP-1 and 2 showed a different
pattern between the OVX and the control groups. A down-regulation of IGF-I and TIMP-1 and an
up-regulation of MMP-1 were observed in OVX rats, which may account in part for the delayed
healing of the osteoporotic fracture and may affect extracellular matrix composition, an important
determinant of callus strength.
Abstract: Nanocubes, monodispersed nanocrystals and nanospheres of Au have been prepared by
a simple reaction between HAuCl4·4H2O, NaOH and NH2OH·HCl in the presence of gelatin. The
role of gelatin and the affection of pH in producing the nanoparticles of Au were discussed. The
products were characterized by X-ray powder diffraction, transmission electron microscopy, and
UV-visible absorption spectroscopy. The sizes of the monodispersed nanocrystals of Au were
estimated by Debye-Scherrer formula according to XRD spectrum.
Abstract: Epoxy-organoclay nanocomposite were prepared and investigated in terms of mechanical
properties and also in term of water diffusion and sulfuric acid corrosion resistance. Diffusion was
studied through epoxy samples containing up to 6phr of organically treated montmorillonite. The
diffusion of the environmental solution was measured by immersion of the samples in these
solutions at elevated temperature with noting the increase in weight as immersion function of time.
An evaluation by flexural strength of the nanoclay/epoxy composites samples was made to
compare their mechanical performances under corrosive environment as a function of immersion
time and temperature.