Nai Ci Bing

Controllable Imprinted Polymer Layer Coated Silica-Gel for S-1-(1-Naphthyl) Ethylamine Recognition by ATRP

Controlled grafting of S-1-(1-naphthyl) Ethylamine-imprinting polymer layer on the silica-gel was carried out by the surface-initiated atom transfer radical polymerization (ATRP). Polymerization time was used as the independent variable to manipulate the amount of grafted imprinting polymer on the silica-gel. For comparison, molecularly imprinted polymers (MIPs) without silica-gel also prepared at the same condition. SEM, FT-IR and UV spectrum were used to study the structural morphology and selectivity of polymers and probe the incorporation of imprinted polymer layer on the surface of substrates. Results indicate that the integration of ATRP and molecularly imprinted polymerization realize preparation of molecular selective polymers and it is possible to tune selectivity and morphology in rational way by changing polymerization times. Meanwhile, we achieve a reference strategy for the development of molecularly imprinting polymer for drugs and to handle forms in certain applications such as chromatographic stationary phases for chiral separations.

Controlled Grafting of S-Naproxen Imprinted Layer on PVDF Microporous Membrane by ATRP

Controlled grafting of S-naproxen-imprinting polymer layer on the poly(vinylidene fluoride) (PVDF) microporous was carried out by the surface-initiated atom transfer radical polymerization (ATRP). Polymerization time was used as the independent variable to manipulate the amount of grafted imprinting polymer on the membrane surface. SEM, SPM and UV spectrum were used to study the structural morphology and selectivity of membranes and probe the incorporation of imprinted polymer layer on the surface of PVDF membranes . Results indicate that the integration of ATRP and molecularly imprinted polymeriaztion realize preparation of molecular selective membranes and it is possible to tune selectivity and morphology in rational way by changing polymerziton times.

Hydrothermal Synthesis and Characterizations of Cobalt-Doped ZnO Nanostructures

Pure and Cobalt-doped ZnO nanostructures have been synthesized by a hydrothermal process. The samples were characterized by X-ray diffraction (XRD), UV-Vis diffusion reflectance spectra (DRS) and X-ray energy dispersion spectroscopy (EDS). The structure and morphology analyses show that Co doping can influence the nanostructures morphology, but cannot change the crystal structures of ZnO samples. The DRS spectra showed that Co dopant enhanced the ability of visible light absorption of the ZnO samples

The Synthesis of Nitrigen Doped Carbon Nanotube with Different Catalyst

Bamboo-like nitrogen-doped carbon (CNX) nanotubes have been synthesized by chemical vapor deposition at high reaction temperature of 850°C. The diethylamine has been used as carbon source and Fe/SBA-15 and Ni/SBA-15 have been used as molecular sieve catalyst. Transmission electron microscopy (TEM) and high resolution transmission electron microscopy (HRTEM) observations showed that the diameter and the wall thickness of CNx nanotubes were increased with the change of catalyst from Fe/SBA-15 to Ni/SBA-15.

Synthesis and Characteristic of Molecularly Imprinted Polymer Immobilized Mesoporous Silica Sphere for Selective Binding of S-Naproxen

Molecularly imprinted composite materials (PM) selective to S-naproxen were prepared in the surface of mesoporous silica sphere (SBA-15) by surface imprinting technique. FT-IR, SEM and surface area analysis were used to study the structural morphology of PM and MIPs particles and probe the incorporation of polymer into the SBA-15 framework. The results revealed that PM showed better binding affinity and selectivity to the template molecule than MIPs and the maximum saturated binding capacity of PM to S-naproxen and R-naproxen was about 10.3332 and 6.0063µmol·g-1. Meanwhile, we achieve a reference strategy for the development of molecularly imprinting polymer for drugs and to handle forms in certain applications such as chromatographic stationary phases for chiral separations.

Corrosion Behaviors in Simulated Body Fluid for TiO2 Films Deposited on AZ31 Magnesium Alloys by Magnetron Sputtering

TiO2 films were deposited on AZ31 magnesium alloy substrates by r.f. magnetron sputtering. The corrosion behaviors in simulated body fluid (SBF) of the film samples were investigated and compared to the bare AZ31 magnesium alloy. After 3 days’ corrosion in SBF, only part of the TiO2 layer suffered from corrosion and the substrate was prevented from corrosion. In contrast, the bare magnesium alloy suffered from severe corrosion. After 10 days’ corrosion, the TiO2 layer was penetrated and the substrates still did not suffer from corrosion. After 15 days’ corrosion, besides TiO2 layer, the substrate suffered from corrosion to some degree. The depth of the corrosion layer is about 6 m, which is far lower than that of bare magnesium alloy, 40 m. The results show that TiO2 films effectively improve the corrosion properties of magnesium alloys.

High-Resolution Ultrasonic Spectroscopy for Crystallization Process

High-Resolution Ultrasonic Spectroscopy (HRUS) is a novel analytical technique for non-destructive material analysis for a wide range of samples and processes. This technique is based on precision measurements of velocity and attenuation of acoustical waves at high frequencies propagating through materials. It has considerable advantages over many alternative technologies because it can be applied to systems that are optically opaque and concentrated without the need of any sample preparation. It provides an unprecedented range of new analytical capabilities for research, product development, quality and process control. Applications of this technique include analysis of solution-phase crystallization, aggregation and gelation phenomena, particle sizing, stability of emulsions and suspensions, microstructural transitions and pharmaceutical manufacturing. Here, we review the theory of the HRUS and its applications on crystallization process.

Photodegradation of Rhodamine B in Water by ETS-10 Prepared through a Novel Titanium Source

Well-crystallized ETS-10 was prepared using TiO2 prepared by industrial propane/air turbulent flame CVD process as a novel titanium source. The synthesis parameters have been studied in detail The photodegradation of a dye solution, rhodamine B (RhB), assisted by ETS-10 was studied. The result showed that the well-crystallized titanosilicate ETS-10 induced complete degradation of RhB in water after 2h illumination under a 300W high-pressure mercury lamp.

Surface Properties of TiN Films on AZ 31 Magnesium Alloys Deposited by Magnetron Sputtering Technique

TiN films were deposited on the AZ 31 magnesium alloy substrates by d.c. magnetron sputtering technique. The surface properties of the films were investigated. The scanning electronic microscope observations reveal the dense structure characteristics of as-deposited TiN films. Under 200°C heat treatment for 30 minutes or 4 times’ heat cycles at 85°C for one hour, no structural defects such as cracks are observed on the surface of the films. Adhesion experiment further demonstrates the stability of the film and the strong combination between the film and the substrate. Nano-indentation experiment shows that the average micro-hardness of TiN film reaches 23.85 Gpa. Finally, the corrosion experiments in simulated body fluid initially reveal the degradation property of TiN film.

Supercritical Solvent Impregnation in Controlled-Release Drugs

In the field of pharmaceutical industry, the controlled-release drugs have received considerable attention in the last years. Impregnation using supercritical fluid technology has already proven its feasibility in the preparation of controlled release systems. The use of supercritical fluids such as supercritical CO2 has provided a ‘clean’ and effective alternative to traditional methods of drug releasing and polymer processes. In particular, scCO2 has a number of unique properties that make it possible to process both bioactive molecules and amorphous polymers without using toxic organic solvents or elevated temperatures. A high purity product, free of residual solvents is obtained, since no organic solvents are involved in the impregnation process. Here, we review the advantages of supercritical fluid and the preparation of controlled-release drugs by supercritical solvent impregnation.