Applied Mechanics and Materials Vols. 184-185

Abstract: Gelatin and alginate are commonly used as biomaterials for making dressings because both of which have hemostasis and high tissue fluid absorption ability. In this study, gelatin and alginate are mixed at various weight ratios, the mixtures of which then undergo the freeze-drying, forming the gelatin/alginate sponges. The resulting sponges serve as the contact surface of dressings, and swelling and degradation tests evaluate the samples in terms of hydrophilicity and absorbility. The pores in the sponges are then observed by a scanning electron microscope (SEM). According to our study, with a decrease in the amount of gelatin, the determined pore size and swelling rate both increase, but the weight loss decreases.

Abstract: The new magnetic organic–inorganic hybrid composite imprinted microspheres (MHCIM) based on Fe3O4 nanospheres as core structure and imprinted materials as shell structure have been synthesized by surface molecularly imprinted technique using dummy template strategy. Scanning electron microscopy images showed that the MHCIM were with a diameter distribution (10-120 µm) and cross-linking, spherical shape, and porous morphologies. The resultant MHCIM incorporating molecular recognition and magnetic separation properties can provide a highly selective absorbent materials for trace extraction and isolation target molecules from complicated biological matrix.

Abstract: Various jute-based activated carbon fibers were prepared by using jute fibers as raw materials and phosphoric acid as activating agent. The effects of three main factors such as concentration of activating agent, activation temperature and activation time on the yield and adsorptive properties of active carbon fibers were investigated via orthogonal experiments. The surface physical morphology of jute-based activated carbon fiber was also observed by using Scanning Electron Microscope. Results showed that the optimum conditions were phosphoric acid concentration of 4 mol/L, activation temperature of 600 °C and activation time of 1h. The yield, iodine number and amount of methylene blue adsorption of the active carbon fiber prepared under optimum conditions were 37.99 %, 1208.87 mg/g and 374.65 mg/g, respectively.

Abstract: Multi-walled carbon nanotues (MWCNTs)/TiO2/CdS composite photocatalysts were prepared by sol–gel method in order to investigate its photocatalytic activity under simulated solar irradiation. MWCNTs/TiO2/CdS composite photocatalysts were characterized by the methods of SEM, XRD, TG and UV–vis. The results showed that MWCNTs/TiO2/CdS composites were mainly composed of anatase-TiO2 and little CdS cubic phases. the composite can cause an pronounced red shift of UV–vis spectra compared with pure TiO2. The degradation of MO by MWCNTs/TiO2/CdS composite photocatalysts under simulated solar light irradiation was studied. The results showd that the presence of MWCNTs and CdS can enhance the photoefficiency of TiO2.

Abstract: Protein-montmorillonite composites were prepared by direct and stepwise intercalation of lysozyme(LYZ) into gallery of montmorillonite(MMT), and characterized by X-ray Diffraction (XRD), Thermal Gravimetric Analysis(TGA) and Atomic Force Microscopy(AFM). The direct intercalation experiment showed that with the increase of LYZ/MMT weight ratio from 1:1 to 4:1, the interlayer space of MMT increased from 4.2nm to 6.3nm, and the adsorption amount of lysozyme onto MMT increased from 1.05mg/mg to 1.84mg/mg. While in stepwise intercalation process, the adsorption of LYZ was obviously lower than that in direct intercalation experiment, indicating that the exchange reaction between lysozyme and POP-D2000 was incomplete in the stepwise intercalation reaction.

Abstract: Choose the organic thermochromic compo site materials as thermochromic microcapsule core-material，Using and studying crystal violet lactone 、bisphenol A and tetradecyl alcohol as the components of compo site materials according to the need of textiles finishies. We analysed the structure and capability of the compo site materials and identified 1:4:70 as the optimal ratio of the compo site materials could suitable for discoloration gradient of textiles，lay the foundation for preparation of microcapsule and textiles finishies. The discoloration fabric as functional textile has a tremendous market potential，its could using discoloration dress、materials-show and prevent bogus marker。Thermochromic fabrics is the intelligent textile and colour changed following the temperature changes. Generally，the Thermochromic materials was encased by microcapsule and using the finishing technology pasted the microcapsule on the surface of fabrics,so the fabric could has the discoloration function. Currently，thermochromic materials have organic、inorganic and Liquid crystal materials. Study to thermochromic materials and achieved a organic thermochromic compo site material in this paper，using the compo site material as the core-material of thermochromic microcapsule for the discolouration fabric finishes.

Abstract: This paper introduced gap filling mechanism of wood and inorganic composite and used the mechanism to optimize the wood properties of poplar. Through double diffusion method of the vacuum impregnation, CaCO3 and poplar composite was prepared. Using Sample characterization methods and performance indexes, prepared wood inorganic nanometer composite (WINC) was with hydrophobic and higher hardness.

Abstract: Highly uniform polyvinylacetate particles of submicron size were prepared by dispersion polymerization in mixed media of isopropanol and water initiated by redox initiator of NaHSO3 and K2S2O8 using poly(N-vinylpyrrolidone) as stabilizer. Monomer conversion was studied gravimetrically. Both the morphology and the size of the particles were measured by TEM. The influences of various polymerization parameters, such as monomer concentration, stabilizer content, on the particle properties were systematically investigated. The PVAc particles synthesized in this research were mono-disperse spheres with the diameter between 100-1000 nm.

Abstract: In this study, we prepared gold nanoparticles in micro-emulsion and found the optimum ratio of micro-emulsion for preparing gold nanoparticles. We reported a new stabilizer for preparing gold nanoparticles in aqueous and found the optimum mass ratio between the stabilizer and chlorauric acid. All gold nanoparticles prepared by these two methods were characterized by transmission electron microscopy, ultraviolet-visible spectrophotometer and synchronous light-scattering spectrophotometer. The results of transmission electron microscopy showed that the diameter range of gold nanoparticles prepared in micro-emulsion was 5~10 nm, and that in aqueous was 10~15 nm. They all had homogeneous distribution and dense structures.

Abstract: Currently, all over countries call for greening the earth. Whereas, there is no enough space to be planted by developing countries, owing to their excessive and intensive development. For establishing green globe, every country expects to green forming urban forest in the way of soilless culture, attached with far-infrared fiber in order to promote root growing speed. This study uses polyester (PET) fiber and far-infrared PET (FIR) fiber to form PET/FIR composite nonwoven fabric by nonwoven processing technology. In this process, blending ratio of PET and FIR fibers was varied. Afterwards, moisture retention, air permeability and far-infrared emissivity of PET/FIR composite nonwoven fabric were all tested. The results show that, blending ratio of PET and FIR fibers has no significant influence on moisture retention and air permeability, but obviously impacts on far-infrared emissivity.