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Yan Ge,Jiapeng Tang,Haihong Fu,Yijun Fu,Yuan-Yuan Wu 한국섬유공학회 2019 Fibers and polymers Vol.20 No.4
In this paper, a notable chitosan/poly(ethylene oxide) nanofiber mats containing tea tree oil liposomes (TOLCENs)were successfully fabricated using electrospinning process. The microstructures and morphology were characterizedby scanning electron microscopy. The porosity, fluid absorbability, water vapor permeability and mechanical properties ofnanofiber mats were also estimated by ethanol density method, gravimetric method, dish method and tensile test,respectively. Compared to the chitosan/poly(ethylene oxide) composite freeze-dried sponges containing tea tree oilliposomes, TOL-CENs had greater porosity, water absorption, breathability and better mechanical properties. In addition, thecontrolled-release properties and long-term bactericidal capability of the material were also assessed. From the analysis of therelease kinetics and mechanism, it was found that the significant decreased terpinen-4-ol concentration gradient fromliposomal surface to the outside of material was the key to the sustained terpinen-4-ol release in virtue of liposomalencapsulation. TOL-CENs exhibited long-term and more excellent microbicidal effects against Staphylococcus aureus,Escherichia coli and Candida albicans than chitosan/poly(ethylene oxide) nanofiber mats. The combination of tea tree oilliposomes and chitosan in nanofiber mats synergistically destroyed cell membrane, prevented cell adhesion and caused theirregular aggregation of cytoplasm, resulting in cell disintegration observed by transmission electron microscope. Insummary, TOL-CENs had potential application value as a long-term antimicrobial nonwoven materials.
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Nondestructive Surface Threshold Definition for Remanufacturing Disassembly of Interference Fit
Dan Zhou,Sen Lan,Xin Gao,Haihong Huang,Guang-Fu Liu 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.19 No.11
The disassembly of interference fit is a difficult process for remanufacturing engineering, which frequently causes multiple types of friction damage, such as scratches, furrow, and adhesion on the surface of parts. The form and size of surface damage directly affect the cost of remanufacturing repair. If the damage is less than a threshold, the part can be directly used for assembly without repairing. This condition represents a nondestructive disassembly, which is the goal of remanufacturing disassembly for interference fit. In this study, varying degrees of disassembly surface damage of interference fit are obtained by experiment and detected by TRIMOS-CL3 3D surface profilometer. Six surface evaluation parameters Sv, Sp, Sq, Str, Vmp, and Sa, are selected from ISO 25178 as indexes for entropy analysis to evaluate the damage comprehensively. According to the interface state, a comprehensive evaluation threshold of nondestructive disassembly is proposed. The rationality of the threshold is verified by the load-carrying capacity experiment of the interference fit.
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