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민경단,박원호,류동일,Min Kyung Dan,Park Won Ho,Yoo Dong Il,Hudson Sam 한국섬유공학회 2005 한국섬유공학회지 Vol.42 No.1
N-pentyl chitosan was prepared by the reaction with n-butyl aldehyde using different n-butyl aldehyde/chitosan ratio. Degree of substitution ($\%$) to amino group in chitosan gradually increased from 45.2 to 99.5 mol$\%$ for the n-butyl aldehyde/chitosan ratio from 1 to 5. The N-pentyl chitosan showed lower water contact angle and water retention value than original chitosan, indicating its higher hydrophobicity. From the evaluation of bonding strength with porcine skin, the N-pentyl chitosan showed higher bonding strength. This suggests that the hydrophobic interaction as well as the hydrophilic interaction plays an important role in bioadhesion.
민경단,박원호,육지호,곽영제 한국고분자학회 2008 Macromolecular Research Vol.16 No.7
Poly(vinyl pyrrolidone) was used successfully to control the size and distribution of silver nanoparticles generated on inorganic silica nanofibers. The inorganic nanofibers were electrospun using sol-gel chemistry of silicates, and the diameter of the prepared nanofibers was unaffected by adding up to 7% of poly(vinyl pyrrolidone). The silver ions, in the form of silver nitrate, were introduced into the silica nanofibers and reduced to metallic silver by ultraviolet irradiation with a subsequent thermal treatment. The size of the generated silver particles was decreased dramatically by adding poly(vinyl pyrrolidone). The size of the silver nanoparticles was 73 nm when no poly(vinyl pyrrolidone) was added but 23 nm with the addition of only 1% of poly(vinyl pyrrolidone). The extent of reduction could be checked by determining the concentration of silver ions leached into water from the silica nanofibers. After thermal treatment of the silica nanofibers, more than 99% of the silver remained in the nanofibers, indicating almost complete reduction of the silver ions to silver metal.