Crimson Publishers-Material Science

Performance of Rice Husk Ash Concrete in Sulfate Solutions by Ash Ahmed* in Crimson Publishers: Journal of Materials Science & Technology Durability of concrete is defined as its ability to resist deterioration after exposure to the environment of its use. This work examined the performance of Rice Husk Ash (RHA) concrete in sodium sulfate (Na2SO4), magnesium sulfate (MgSO4) and combined Na2SO4 and MgSO4 solutions. Concrete bar specimens and cubes were prepared for elongation and strength deterioration tests respectively using RHA replacement at the 7.5% replacement by volume, which had achieved the highest compressive strength from a previous study, as well as at the 30% replacement by volume, which was the highest replacement for the study. Strength deterioration tests were performed on the 7.5% replacement by the weight of cement. From the elongation findings, it was concluded that at the 7.5% replacement, RHA could be used with an advantage over 100% cement concrete in...

Disintegration Properties and Drug Release Profiles of Sodium Alginate Films Modified  with Additives in Yoshifumi Murata* in Crimson Publishers: Journal of Materials Science  & Technology   The film dosage form (FD) is an attractive dosage form that can be used for local drug delivery. In this study, FDs were prepared with sodium alginate (Alg-Na) and additives. The disintegration profiles of the FDs were then assessed by measuring the amount of Alg-Na dissolved from the films in a limited aqueous medium. Caffeine and dexamethasone were used as the model drugs in the films. The relationship between disintegration rate of FD and drug release rate was then investigated. The disintegration rate of the FDs was accelerated when ascorbic acid was added as an additive to the film base. This phenomenon was not observed when sodium ascorbate was used as the additive. The disintegration profiles of the FDs did not affect the release rate of caffeine from the FDs. Conv...