Papers by Author: Ling Lin

Abstract: The porous Ti plates with nanograde pore size were successfully prepared by dip-coating technique, using stainless steel plates as support and 400mesh Ti powders as raw material. The stainless steel plates were firstly dipped into Ti slurry and then pulled out with desired withdrawal velocity. After sintered in a vacuum furnace, stainless steel supports were removed by aqua regia. The obtained products were characterized by X-ray diffraction, sanning electron microscope and N2 adsorption–desorption isotherms. The results had shown that the thickness and pore characters of porous Ti plates could be controlled by adjusting the withdrawal velocity. When the withdrawal velocity was controlled between 0.2mm/s and 1mm/s, the porous Ti plates had smooth surface without cracks and the most pores were interconnected. The maximum pore diameters could be less than 300nm and the porosities of porous Ti plates are more than 4.9%. The kind of preparation method has advantages of simple technology, easy operation and high purity. These indicated that the porous sintering Ti plates were promising to be used as ultrafilter membranes.

Abstract: Alcohol content is an important indicator of many products, rapid and accurate analysis is the key link of commodity inspection and productive process. Study using NIRS model to detect alcohol content of wine, adopted genetic algorithm partial least-squares (GA-PLS) method to analyze the near-infrared spectroscopy (NIRS) characteristic wavelengths of alcohol content, the best NIR GA-PLS model is established. Experiment find GA-PLS can flexible and effective select out the characteristic wavelengths, can not only get rid of the useless information wavelengths, but also improve model’s predicted precision, therefore, the predicted precision of GA-PLS model superior to PLS model established with global spectrum. The best predicted effect is obtained when 133 wavelengths with higher selected frequency join modeling, its root mean square error of prediction (RMSEP) is 0.0066 and correlation coefficient of prediction (R_P) is 0.9996. The results show, NIRS combined with GA-PLS method can detect alcohol content of wine rapidly and accurately, expected to achieve rapid detection of alcohol content online.

Abstract: The bioactivity of TiO₂/Ti composite membrane with different crystral phase was studied by the culture of hypothalamic neurons in vitro for the application of immunoisolation. The kind of membrane supported on porous Ti has been prepared by sol-gel technique and the crystral phase was controlled by different sintering temperature. The crystral phase of TiO₂, morphology and function of hypothalamic neurons were observed by X-ray diffraction (XRD), enzyme-linked immunosorbent assay (ELISA) and environmental sanning electron microscope (ESEM). The results showed that neurons could attach well to the TiO₂ /Ti composite membranes with rutile phase and became bipolar. The long axon and dendrite with dendrite spine were interconnected by synapses. A complicated neural net were easily observed. The secretory level of β-endorphine remained between 51.3pmol/L and 40.6pmol/L all the times. However, the neurons in membranes with anatase were transformed into an umbilicate structure without processes. The secretory function of neurons also died out in 4 days. These results indicated that the TiO₂ /Ti composite membranes with rutile phase were propitious to the neuron’s growth than the composite membranes with anatase phase and could be used as immunoisolation membranes.