The Experts below are selected from a list of 20532 Experts worldwide ranked by ideXlab platform
Hiroshi Uyama - One of the best experts on this subject based on the ideXlab platform.
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green sago starch nanoparticles as Reinforcing Material for green composites
Polymer, 2020Co-Authors: Afiqah Nabihah Ahmad, Namasivayam Navaranjan, Hiroshi UyamaAbstract:Abstract This study reports a new method of fabrication and application of “green” starch nanoparticles (SNPs) from local sago (Metroxylon Sagu) starch granules employing a high-pressure homogenization procedure. This approach is environmentally friendly, highly feasible, low cost and chemical-free with large-scale production capacity. In this work, SNPs' morphological, particle size and thermal properties were studied. The effects of SNPs concentration (ranging from 0 to 8% w/w) as nano-fillers in composite films’ barrier, transparency and contact angle were also investigated. Our results have shown that the fabricated SNPs exhibited excellent uniformity and spherical shapes. Addition of SNPs have demonstrated to enhance polymeric structure of nanocomposite film due to decreased water vapour permeability and increased contact angle. Sago SNPs as fillers pose an excellent prospect in green composites fabrication for Material and biomedical purposes with potential application as carriers for drug delivery.
Vahid Afroughsabet - One of the best experts on this subject based on the ideXlab platform.
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combined effect of silica fume and steel fibers on the impact resistance and mechanical properties of concrete
International Journal of Impact Engineering, 2010Co-Authors: Mahmoud Nili, Vahid AfroughsabetAbstract:Abstract This study investigated the impact resistance and mechanical properties of steel fiber-reinforced concrete with water–cement ratios of 0.46 and 0.36, with and without the addition of silica fume. Hooked steel fibers with 60-mm length and an aspect ratio of 80, with three volume fractions of 0%, 0.5%, and 1% were used as the Reinforcing Material. In pre-determined mixtures, silica fume is used as a cement replacement Material at 8% weight of cement. The experimental results show that incorporation steel fibers improve the strength performance of concrete, particularly the splitting tensile and the flexural strengths. A remarkable improvement was observed in impact resistance of the fibrous concretes, as compared with the reference Materials. The results demonstrate that when steel fiber is introduced into the specimens including silica fume, the impact resistance and the ductility of the resulting concrete are considerably increased.
Madhavi Latha Gali - One of the best experts on this subject based on the ideXlab platform.
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effect of particle size of sand and surface asperities of reinforcement on their interface shear behaviour
Geotextiles and Geomembranes, 2016Co-Authors: Prashanth Vangla, Madhavi Latha GaliAbstract:Abstract This paper investigates the effect of particle size of sand and the surface asperities of Reinforcing Material on their interlocking mechanism and its influence on the interfacial shear strength under direct sliding condition. Three sands of different sizes with similar morphological characteristics and four different types of Reinforcing Materials with different surface features were used in this study. Interface direct shear tests on these Materials were performed in a specially developed symmetric loading interface direct shear test setup. Morphological characteristics of sand particles were determined from digital image analysis and the surface roughness of the Reinforcing Materials was measured using an analytical expression developed for this purpose. Interface direct shear tests at three different normal stresses were carried out by shearing the sand on the Reinforcing Material fixed to a smooth surface. Test results revealed that the peak interfacial friction and dilation angles are hugely dependent upon the interlocking between the sand particles and the asperities of Reinforcing Material, which in turn depends on the relative size of sand particles and asperities. Asperity ratio (AS/D 50 ) of interlocking Materials, which is defined as the ratio of asperity spacing of the Reinforcing Material and the mean particle size of sand was found to govern the interfacial shear strength with highest interfacial strength measured when the asperity ratio was equal to one, which represents the closest fitting of sand particles into the asperities. It was also understood that the surface roughness of the Reinforcing Material influences the shear strength to an extent, the influence being more pronounced in coarser particles. Shear bands in the interface shear tests were analysed through image segmentation technique and it was observed that the ratio of shear band thickness (t) to the median particle size (D 50 ) was maximum when the AS/D 50 was equal to one.
Hiroshi Tsumura - One of the best experts on this subject based on the ideXlab platform.
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mechanical evaluation of hip cement spacer reinforcement with stainless steel kirschner wires titanium and carbon rods and stainless steel mesh
European Journal of Orthopaedic Surgery and Traumatology, 2015Co-Authors: Nobuhiro Kaku, Tomonori Tabata, Hiroshi TsumuraAbstract:Introduction In two-stage treatments for infections after total hip arthroplasty, antibiotic-loaded cement spacers help treat the infection by antibiotic elution and prevent contraction. However, such spacers are weak and may fracture while awaiting replacement, impairing functionality. We evaluated whether a Kirschner wire (K-wire) mounted into the spacer reinforced its strength along with the effects of the Reinforcing Material, position, and intensity.
Afiqah Nabihah Ahmad - One of the best experts on this subject based on the ideXlab platform.
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green sago starch nanoparticles as Reinforcing Material for green composites
Polymer, 2020Co-Authors: Afiqah Nabihah Ahmad, Namasivayam Navaranjan, Hiroshi UyamaAbstract:Abstract This study reports a new method of fabrication and application of “green” starch nanoparticles (SNPs) from local sago (Metroxylon Sagu) starch granules employing a high-pressure homogenization procedure. This approach is environmentally friendly, highly feasible, low cost and chemical-free with large-scale production capacity. In this work, SNPs' morphological, particle size and thermal properties were studied. The effects of SNPs concentration (ranging from 0 to 8% w/w) as nano-fillers in composite films’ barrier, transparency and contact angle were also investigated. Our results have shown that the fabricated SNPs exhibited excellent uniformity and spherical shapes. Addition of SNPs have demonstrated to enhance polymeric structure of nanocomposite film due to decreased water vapour permeability and increased contact angle. Sago SNPs as fillers pose an excellent prospect in green composites fabrication for Material and biomedical purposes with potential application as carriers for drug delivery.