Advanced Materials Research Vols. 332-334

Abstract: This paper reports on an experimental investigation of the effects of clothing ventilative designs on thermal comfort measured in terms of thermal insulation. Eight T-shirts with varying areas and locations of mesh fabric were designed and produced for testing on a dry thermal manikin. Clothing thermal insulation of T-shirts was measured under three wind velocities: 0.5, 1 and 2m/s. The results showed that, the areas and locations of ventilation panels affect the total thermal insulation. The T-shirts with larger area of mesh fabric are preferable in terms of releasing more body heat. Among various designs tested, mesh fabrics applied at two vertical side seams can most effectively release heat and moisture from the body. Clothing insulation is also greatly affected by wind.

Abstract: Coating nano-sized TiO2 and SrAl2O4:Eu2 +, Dy3 + lanthanum luminous material on PVC membrane structure material to change its surface properties, then study the self-cleaning and luminous properties after the surface treatment .The results show that: the PVC membrane structure material can degrade the organic matter of methylene blue and oleic acid and has good dirt-pick property after the surface treatment with nano-sized TiO2 and SrAl2O4:Eu2 +, Dy3 +lanthanum luminous material. The photodegradation efficiency reaches to the highest when the TiO2 concentration is 1% and coated for three layer. In addition, the SrAl2O4:Eu2 +, Dy3+ lanthanum luminous material can not only endow the PVC membrane structure material glowing function in the darkness, but also ,it can improves the photodegrading efficiency of the PVC membrane structure material. With the increasing of the concentration of luminous materials, the photodegrading efficiency is increased.

Abstract: Basalt fiber is a novel high-performance inorganic material, recently has been well received as a reinforcement in China. However, the applications in civil engineering have been rather limited. The chemical compositions, the characteristics of basalt fibers, and the typical products of basalt, including chopped yarn of basalt fiber, basalt fiber geo-textiles and basalt fiber reinforced polymer, were introduced．The advantages of basalt fibers as a reinforcement of concrete were explored in comparison with the commonly used reinforcing fibers, which indicates that basalt fiber is the most promising reinforcement material for concrete and will significantly benefit civil construction industries in the future.

Abstract: Abstract. Multiwall carbon nanotubes (MWNTs) were modified by grafting the maleic anhydride (MAH). The morphologies and structures of modified multiwall carbon nanotubes (MWNTs) were characterized by using Scanning Electrohic Microscope (SEM) and Fourier Transformation Infrared (FTIR). The results showed that a layer of maleic anhydride was grafted on the surface of MWNTs by covalent bonding.

Abstract: Biodegradable polymer has been widely used in surgical suture, dressing, artificial bone and other bone-related applications. Studies have demonstrated that metals, such as titanium, titanium alloys or 316L stainless steel, can be widely used in dental and maxillofacial surgeries. The present study aimed to fabricate a scaffold with a blend of multilayer polylactic acid (PLA) ply yarns with 316L stainless steel (SS) braids, which was then immersed in simulated body fluid (SBF), forming the PLA/SS composite braid with hydroxylapatite deposition. After being immersed in SBF for 14 days, the PLA/SS composite braid was covered with precipitate which was confirmed to be apatite deposition according to surface observation and EDS evaluation.

Abstract: Abstract: Igneous gem is a modified mineral glass without devitrification during processing, which is far stronger than traditional basalt materials comprising both glass and crystal phases. Fiber made by igneous gem is an ideal reinforcement for the armor of submarine, with advantages such as infrared stealth (thermal insulation), sonar stealth (anti-vibration), radar stealth (transparent to radar wave), heavy duty anticorrosion, bullet-proof (theoretical tensile strength 15,000MPa), fire resistant (working temperature 910 oC) and ultralow temperature resistant (working temperature up to -269 oC), anti-aging and so on. The corresponding experimental data and mathematical models were demonstrated in this study and compared with other high performance materials. The honeycomb structure was proposed for the prefabricated composite and the advantages of such a material were thoroughly stated.

Abstract: In the present work, cone calorimetric technique has been widely used to study the flammability of polymer. But there are few reports about the cone calorimetric technique exploited for textile. The flammability of cotton fabrics selected in this study was tested by cone calorimeter. The factors, such as fabric layers, heat flux, whether subjoining grid, were discussed and the repeatability of cone calorimetric data was analyzed. In addition, Attempts had been made to establish the suitable methods for measuring the flammability of textiles by cone calorimeter.

Abstract: Fe nano-films deposited on pure Si wafer by metal vapor vacuum arc (MEVVA) ion deposition system were annealed in hydrogen and then treated by ammonia at 750 °C for the catalyzed growth of aligned carbon nanotube (CNT) arrays. Influence of ammonia on the microstructures of Fe nano-films was analyzed by a field emission scanning electron microscopy (FESEM) and image analysis software. The microstructures of the post-processed Fe nano-films were found depending on the processing time of ammonia and the film thickness. Comparing the growth results of CNTs from 10 nm Fe films, we found that when the processing temperature was 750 °C, the optimum processing time of ammonia was about 10 to 12 min for 10 nm Fe films to catalyze the growth of aligned CNT arrays.

Abstract: The synthesis by thermal decomposition of rare earth doped yttrium oxide nanoparticles was investigated. The elements of the rare earth were europium, which showed strong fluorescence, and erbium, which indicated upconversion properties. Metal-oleate complex was used as a precursor. The results of Scherrer’s equation and SEM indicated that nanoparticles were successfully synthesized. Appropriate thermal decomposition time increased fluorescence intensity of europium activators by completion of thermal decomposition of oleic acid, while too long thermal decomposition time decreased the fluorescent intensity. Fluorescence of erbium activator was observed after annealing, while it was not observed before annealing because of stronger fluorescence of oleylamine.