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International Journal of Material Science
   [4 followers]  Follow    
  This is an Open Access Journal Open Access journal
     ISSN (Print) 2226-4531 - ISSN (Online) 2226-4523
     Published by Science and Engineering Publishing Company Homepage  [46 journals]
  • Effect of Modified Polyorganosiloxane on Physical Properties of Acrylate
           Hard Coating

    • Abstract: Effect of Modified Polyorganosiloxane on Physical Properties of Acrylate Hard Coating
      Pages 35-38
      Author Ho-Jong KangSeung Woo BakDoo Whan Kan
      Rubber toughened acrylate was investigated as a protective hard coating material for plastic film to improve the flexibility while maintaining intrinsic hardness of acrylate. Polyorganosiloxane(POS) was chosen as a rubber phase to apply thin acrylate coating. Poly(methyl-vinyl) siloxane (PMVS) and modified polydimethylsiloxan (PDMS) having urethane and urea linkage were synthesized and also introduced as a rubber toughening phase. Increasing PMVS content in acrylate caused the increase of flexibility as well as hardness. However, the printability was dramatically dropped due to the increase of hydrophilicity on the coating surface by PMVS. Modified PDMSs having urethane and urea linkage in main chain enhanced the flexibility and hardness similar to PMVS while maintaining hydrophobicity which affected the printability in the coating surface. In addition, it was found that PMVS and modified PDMSs did not affect the optical transmittance in acrylate coating.
      PubDate: 2014-03
       
  • Development of One-hour Fire-resistive Building Materials Made of
           Combustible Japanese Cedar Using Laser Incising

    • Abstract: Development of One-hour Fire-resistive Building Materials Made of Combustible Japanese Cedar Using Laser Incising
      Pages 31-34
      Author Nobuaki HATTORIKeisuke AndoToshiro HARADADaisuke KAMIKAWAMasayuki MIYABAYASHIKouta NISHIMURANorichika KAKAEKeiichi MIYAMOT
      Conventional glued-laminated timber (glulam) was not permitted any more to be applied to a wooden building in the fire preventive district since the amendments of the Building Standard Law in 2000. The Japanese Government set the self-sufficiency rate of the domestic wood supply at 50% within ten years in 2011 and enacted the new legislation to promote wooden structures and wooden interior decorations in public buildings as long as possible. Therefore, it is strongly desired to develop fireproof structural materials usable in urban area to achieve goals. Therefore, one-hour fireproof glued-laminated timber (glulam) and cross laminated timber (CLT) were developed made of Japanese cedar (Cryptomeria japonica D. Don) which is the major species in Japan and combustible by incision to fire-die-out part of lamina with CO2 laser. The structure in cross-section of the glulam consists of three zones, namely, load-bearing part (untreated glulam), fire-die-out part impregnated fire-retardant chemicals and surface part (untreated lamina). An one-hour fire-resistive CLT was also developed using the same concept as the glulam and its performance was confirmed by the fire-resistance test. The first wooden building whose main structural members were made of the fireproof glulam marketed as FR wood® was also introduced briefly.
      PubDate: 2014-03
       
  • Complexation of Cobalt with a Heteropolyanion of Dawson Type and Recovery
           by Emulsified Liquid Membrane

    • Abstract: Complexation of Cobalt with a Heteropolyanion of Dawson Type and Recovery by Emulsified Liquid Membrane
      Pages 14-21
      Author Nacéra ZabatMostefa Abbess
      In this study, a lacunar heteropolyanion (HPA) of Dawson type (P2W15Mo2O61)10- was prepared and tested in the complexation of aqueous (Co2+). The complex formed was recovered after that using an emulsified liquid membrane (ELM). The results showed that the complex (P2W15Mo2O61Co)8- was very stable with constant stability of β = 4,073.103. The recovery of this complex formed by (ELM) attained the yield of 70%.
      PubDate: 2014-03
       
  • Acoustic Emission Based Method to Characterize Glass/Epoxy Composite
           Damages During 3-point Bending Test

    • Abstract: Acoustic Emission Based Method to Characterize Glass/Epoxy Composite Damages During 3-point Bending Test
      Pages 22-30
      Author Mohamad FotouhiParinaz Belalpour DastjerdiMehdi Ahmad
      Acoustic emission (AE) method is a capable non-destructive method for recognition of different fracture mechanisms in composite materials. Discrimination of AE signals related to various fracture modes is important in the application of this technique. Thus, in this study, integration of genetic algorithm (GA) and k-means algorithm was used to cluster AE signals of glass/epoxy composite during quasi-static three-point bending test. Performing clustering analysis, three clusters with distinct frequency ranges were obtained; and each one indicates a separate fracture mechanism. In addition, time-frequency analysis of AE signals, which is derived from wavelet packet transform (WPT), was performed. With the purpose of finding the principal components correlated with various damage mechanisms, the energy distribution criterion was used. The frequency ranges of the principal components were then compared with k-means genetic algorithm (KGA) results. Also, SEM observation was used to validate the results. The achieved results indicate excellent performance of the proposed techniques in the damage discrimination of composite materials.
      PubDate: 2014-03
       
  • The Fabrication and Calibration of an Iridium pH Micro-sensor for
           Biological Applications

    • Abstract: The Fabrication and Calibration of an Iridium pH Micro-sensor for Biological Applications
      Pages 8-13
      Author Francesco ContuManuel Vega-ArroyoRay Taylo
      A metal-metal oxide electrode based on the pH sensitivity of the redox equilibrium reactions between Ir(IV) and Ir(III) oxides was prepared for biological applications. Electrodes were prepared using multiple voltage sweeps, coated with a proton conducting membrane, followed by a water soak. It was shown that prior to testing the pH of biological media, it was necessary to calibrate the sensor in proteinaceous solutions. Results obtained from calibration experiments conducted in inorganic buffers, fetal bovine serum and artificial saliva show a sensitivity of 47 mV/pH and time response of 50 seconds.
      PubDate: 2014-03
       
  • Effect of a Surfactant Assisted Synthesis on the Electrochemical
           Performance of a LiFePO4-CNT Composite Electrode

    • Abstract: Effect of a Surfactant Assisted Synthesis on the Electrochemical Performance of a LiFePO4-CNT Composite Electrode
      Pages 1-7
      Author Ulla LassiTao HuElina PohjalainenTanja KallioKrisztian KordasHeli Jantune
      This research aims at improving the performance of lithium iron phosphate (LiFePO4) positive electrode material by using carbon nanotubes (CNT) to increase the conductivity and nonionic surfactant to achieve better dispersion of CNTs in the composite material. LiFePO4-CNT composites were synthesized by the wet chemical method and functionalized multi-walled carbon nanotubes MWCNT-COOH were added in-situ. The nonionic surfactant polyoxyethylene-oleyl ether (E-230) was used to enhance the dispersion of MWCNT in the LiFePO4nanopowder and removed during the last step of the synthesis to avoid possible unwanted side reactions of the surfactants in the battery. During this last step, the composite materials were heated at 500-700°C in an Ar-H2 atmosphere for several hours. XRD, DTA/TG, FESEM and EFTEM were used for characterization of the crystallization and microstructure of the obtained composites. Electrochemical performance was characterized by charging and discharging experiments with various C-rates using standard lithium ion battery half cells. Results showed that the addition of MWCNT-COOH and the surfactant E-230 remarkably increased the obtained capacities of LiFePO4. Acting as a dispersant and interfacial coupling agent, the nonionic surfactant enhanced the dispersion of carboxylic MWCNT into the LiFePO4 during the in-situ synthesis and enhanced the specific capacity of the tested composites.
      PubDate: 2014-03
       
  • Investigation on Relationship Between Energy Storage and Special
           Performance of L-arginine Phosphate Monohydrate (LAP) Crystal

    • Abstract: Investigation on Relationship Between Energy Storage and Special Performance of L-arginine Phosphate Monohydrate (LAP) Crystal
      Pages 39-43
      Author Guanghui ZhangDong XuXitao LiuLei WangLuning WangXinqiang Wan
      Phosphate arginine (PA) has been known as the medium carriers for bioenergy storage, while the similar structural substance L-arginine phosphate monohydrate (LAP) crystal is an excellent nonlinear optical crystal with a high laser-induced damage threshold. Energy storage in organism and laser-induced damage in crystals are both correlative to energy. Temperature dependence X-ray diffraction (XRD) and solid state NMR spectroscopy were performed to explore the impact of energy (heat and magnetic) fields on LAP crystal. XRD results reveal that LAP processes a reversible specific phase transition as the temperature changed. Saturation recovery experiments have shown that the crystal has a long proton spin-lattice relaxation time (1H T1) of 184 s with an amazing solid-state stability. The nuclear magnetic resonance (NMR) and fluorescence emission spectra of LAP solution compared with several amino salt solutions have also been investigated. The results show that the emission wavelength of LAP solution is blue-shifted from 415 to 380 nm. When energy (laser, heat, magnetic and etc.) fields are applied on LAP crystal, it processes a various of distinctive properties which make LAP a special material worthy of further detailed investigation.
      PubDate: 2014-03
       
 
 
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