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RISS 인기검색어
- 검색키워드
- 저자 : Ruth M. Muthoka (검색결과 2 건)
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Rheology Design and Experimental Test of Roll-to-Roll Process for Electroactive Cellulose Film
윤선진,Lindong Zhai,김현찬,김정웅,Ruth M. Muthoka,Debora Kim,김재환 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.19 No.9
This paper reports a theoretical model to analyze the roll-to-roll process for electroactive cellulose film that consists of casting, curing and drying processes, and the experimental data that reflect the effect of viscosity and rheology on the thickness control of the film. Analytical solutions were obtained from Navier-Stokes equation for the coupled fluid dynamic model reflecting the phase change of the cellulose during the curing and drying processes. The effect of the roll-to-roll casting speed on the flow velocity and the thickness of electroactive cellulose film were analyzed. The model successfully evaluated the flow velocity and the thickness of the processed films. Experimental verification on the analysis was conducted and the measured thickness data showed an inverse proportional relationship to the casting speed. Hole defects was observed during the fabrication of electroactive cellulose films, and the increased viscosity inside the blade gap and the lack of a yield stress in the fluid were presumed as the reasons for the hole defects. To remove the hole defects, dual ultrasonic vibration system was introduced. The results are applicable for roll-to-roll processes for other film fabrications.
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Review of Soft Actuator Materials
김재환,김정웅,김현찬,Lindong Zhai,고현우,Ruth M. Muthoka 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.20 No.12
Soft actuator materials change their shape or size in response to stimuli like electricity, heat, light, chemical or pH. These actuator materials are compliant and well suited for soft mechatronics and robots. This paper introduces the definition of soft materials and the position of soft actuator materials in comparison with conventional actuators and other solid state actuator materials. A thorough review of selected soft actuator materials is carried out, including responsive gels/hydrogels, ionic polymer metal composites, conducting polymers, carbon nanotubues/graphenes, dielectric elastomers, shape memory polymers and biopolymers. This review will give insights for applications of soft actuator materials via better understanding of the materials in terms of their preparation, performance and limitation.
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