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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]
  • Rational Approach for Material Selection in FRP-Bonded Reinforced Concrete

    • Abstract: Rational Approach for Material Selection in FRP-Bonded Reinforced Concrete Repair
      Pages 65-72
      Author Moncef NehdiHasan Nikopou
      Fibre-reinforced polymers (FRP) wraps have shown great promise in the retrofit and rehabilitation of ageing and damaged reinforced concrete (RC) elements. After nearly four decades of research in this area, the FRP material selection for a particular repair application is still a challenge in the research and industrial communities. This paper presents novel approaches for selecting the optimum FRP choice from a list of candidate materials.
      PubDate: 2014-6
  • Electrical Behaviour of Carboxy Methyl Cellulose Doped Adipic Acid Solid
           Biopolymer Electrolyte

    • Abstract: Electrical Behaviour of Carboxy Methyl Cellulose Doped Adipic Acid Solid Biopolymer Electrolyte
      Pages 59-64
      In this work, solid biopolymer electrolytes (SBEs) based on carboxymethyl cellulose (CMC) doped with adipic acid (AA) has been prepared by dual solvent solution casting technique. The highest room temperature ionic conductivity is 6.12 x 10-7 S cm-1 for 5 wt. % AA SBE. The temperature-dependent ionic conductivity of SBE films followed Arrhenius behaviour where R2~1. In this system, the frequency dependent of dielectric, modulus and tangent study at various temperature and frequencies was observed to be non-Debye type. That the activation energy of relaxation is lower than the activation energy of conduction implies that the charge carrier has to overcome the higher energy barrier during conducting.
      PubDate: 2014-6
  • Microencapsulation of Ascorbic Acid as Redox Initiator with Tripalmitin

    • Abstract: Microencapsulation of Ascorbic Acid as Redox Initiator with Tripalmitin
      Pages 53-58
      Author Masato TanakaYoshinari Taguch
      We have tried to microencapsulate powdery ascorbic acid as a redox initiator for polymerization with tripalmitin of the shell material by the coating method in order to give the core water resisting qualities. Microencapsulation was performed in the mill pot in which the core and the shell were mixed together with the pulverizing solvent. In the experiment, the added amount of tripalmitin as the shell material and the concentration of ethyl alcohol as the pulverizing solvent were mainly changed stepwise. It was investigated how the operational conditions affected the characteristics of microcapsules such as the water proof degree, the content of core material, the microencapsulation efficiency and the yield. The water proof degree of microcapsules was increased with the added amount of shell material and the concentration of pulverizing solvent. The microencapsulation efficiency was changed from 70 to 90% according to the operational conditions. The yield and the content were changed from 90 to 100% and from 35 to 46% according to the operational conditions, respectively. It was found that the microcapsules were able to induce polymerization of methyl methacryate by breaking the microcapsule shell due to heating.
      PubDate: 2014-6
  • Substrate Temperature Influenced Physical and Electrochromic Properties of
           MoO3 Thin Films

    • Abstract: Substrate Temperature Influenced Physical and Electrochromic Properties of MoO3 Thin Films
      Pages 78-89
      Author S. UthannaS. SubbarayuduV. Madhav
      Molybdenum oxide (MoO3) films were deposited on glass and silicon substrates by sputtering of molybdenum target at different substrate temperatures in the range 473-573 K at a constant oxygen partial pressure of 4x10-4 mbar employing RF magnetron sputtering technique. The effect of substrate temperature on structural, morphological, electrical and optical properties of the MoO3 films was systematically studied. X-ray diffraction studies revealed that the films formed at 303 K were amorphous in nature, while those deposited at substrate temperature 473 K were orthorhombic MoO3 with crystallite size of 27 nm and the crystallinity increased with increase of substrate temperature. The scanning electron micrographs of the films deposited at 303 K were of fine grain structure in amorphous back ground and the films formed at 523 K contained the grains with shape of platelets piled one over the other with size of about 1 μm. Fourier transform infrared transmittance spectra exhibited the characteristic vibration modes of MoO3. The electrical resistivity of the films decreased with increase of substrate temperature due to partial filling of oxygen ion vacancies. The optical band gap and refractive index of the films increased with the increase of substrate temperature. The MoO3 films formed at substrate temperature of 523 K exhibits high optical modulation of 22% and coloration efficiency of 30 cm2/C.
      PubDate: 2014-6
  • Low Temperature Ageing Effects in NiTi Shape Memory Alloys

    • Abstract: Low Temperature Ageing Effects in NiTi Shape Memory Alloys
      Pages 73-77
      Author K. Hari KrishnanP. S. MisraK. ChandraVinod S. Agarwal
      This paper reports the comprehensive study of the characteristics of the R-phase transformations observed in low temperature aged (@ 1500C) Ti-49.85 atomic percent Ni shape memory alloys (SMAs). The stabilizations of the R-phase transformations occurred with two separate transformation peaks were observed in DSC study in prolonged aged conditions. In conventional ageing temperature ageing at 3000C, R-phase transformations exhibit an increase in Af temperature; but in low temperature aged NiTi shows that measured Af temperature is lower than the solutionized sample and R-phase appeared well below the original B2→B19’ transformation temperature initially; this result is very peculiar for this ageing treatment. The energy required for the nucleation of this phase ∆HB19’→R on heating cycle was 2.24 J/g, which was much lower than the reverse transformation (on cooling) ∆HB19’→R = –12.6 J/g. This loss of about –8.55 J/g, is believed to be covered by the transformations between the two peaks of B19’→R and R→B2 in heating. The occurrence of the R-phase transformation is attributed to precipitation-induced inhomogeneity of the matrix, both in terms of composition and internal stress fields.
      PubDate: 2014-6
  • Carbon Nano-Tube and Nano-Fiber in Cement Mortar: Effect of Dosage Rate
           and Water-Cement Ratio

    • Abstract: Carbon Nano-Tube and Nano-Fiber in Cement Mortar: Effect of Dosage Rate and Water-Cement Ratio
      Pages 45-52
      Author Nur YazdaniVinoth Mohana
      Carbon nano-materials, especially Carbon Nanotubes (CNT) and Carbon Nanofibers (CNF), are two of the most prospective advanced materials for application in cement based products for the construction industry, due to their excellent material properties. In this study, their application in cement mortar was comparatively studied. Two mechanical properties, 28-day compressive strength and flexural strength, of CNT and CNF cement composites were investigated herein. The flow value of fresh mortar composites and Scanning Electron Microscope (SEM) images of hardened mortar samples were also explored. Composites with 0.1% and 0.2% of CNT and CNF and water/cement ratios of 0.35 to 0.5 were utilized, together with appropriate sonication techniques, based on the results from a previous study. Both CNT and CNF composites demonstrated significant increase in compressive strengths, as compared to plain mortar control samples (maximum 154% for CNT and 217% for CNF samples). The flexural strengths were also enhanced, although not at the same level as compressive strengths (maximum 53% for CNT and 50% for CNF samples). Water/cement ratios in the range of 0.35-0.4 were found to produce the higher strengths, together with a 0.1% dosage rate for the CNT/CNF. Statistical analysis of the test results showed the significance of the enhanced strengths. It seemed that the CNT was better dispersed in the cement matrix than the CNF, because a correlation between the flow test results and the compressive strengths was detected for the CNT samples. SEM (Scanning Electron Microscope) images showed fair to good dispersion of CNT/CNF in the hardened samples.
      PubDate: 2014-6
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