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In this study, we investigated the antibacterial mechanism through the interfacial contacting inhibition behaviors of chitosan antimicrobials against Escherichia coli in solid dispersing state. Chitosan microspheres (CMs) were prepared by emulsification cross-linking reaction, and oleoyl-CMs (OCMs) were obtained by introduction of oleoyl groups to the(More)
Cross-linked chitosan microspheres (40-100 microm) with smooth surface were prepared by the methods of emulsification and ethanol coagulant. FTIR results showed that the cross-linking reaction occurred on the amino groups of chitosan molecules. The swelling characteristic of chitosan microspheres was influenced by the environment pH, being generally greater(More)
A noval cellulose acetate/chitosan multimicrospheres (CACM) was prepared by the method of w/o/w emulsion. The concentration of cellulose acetate (CA) and the ratio of CA/chitosan (CS) had influence on the CACM size, and appearance. Ranitidine hydrochloride loading, and releasing efficiency in vitro were investigated. The optimal condition for preparation of(More)
This paper presents the latest development of high-frequency (>100MHz) PZT film ultrasonic transducers and kerfless arrays. PZT thick films of 12 ¿m in thickness were fabricated with a spin-coating method. The films were found to have a remanent polarization of 33 ¿C/cm2 and a coercive field Ec of 70 kV/cm. High-frequency (120MHz) single element transducers(More)
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