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자히드,조종두 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.
This work presents analytical models for predicting the surface stress-induced deflection and stress in silicon and CMOS piezoresistivemicrocantilevers. The models can be combined to determine the surface stress sensitivity of such microcantilevers when used forsurface stress studies. The substrate of silicon cantilever is silicon and of CMOS is silicon dioxide. The cantilevers have a p-dopedsilicon piezoresistor. The piezoresistor size is varied to investigate its effect on the sensitivity under a surface stress of 1 N/m. Theanalytical results are compared against numerical ones obtained using a commercial finite element analysis software. The sensitivityresults show good conformity between analytical and numerical predictions with the average deviation of about 4%.
자히드,Seyeong Lee,Nasir Arsalani,Kurt E. Geckeler,홍석원,윤명한 대한화학회 2016 Bulletin of the Korean Chemical Society Vol.37 No.2
In this study, commercially available cellulose membranes were hybridized with conjugated polymer via vapor-phase polymerization using pyrrole and iron chloride as a monomer and oxidant, respectively. The iron (III) chloride layer dip-coated on the hydrophilic cellulose surface oxidized the vaporized pyrrole monomer leading to the polypyrrole–cellulose hybrid membrane. The conductivity of hybrid membrane was optimized by varying the oxidant concentration and the monomer vapor exposure time. The various surface characterizations of polypyrrole–cellulose hybrid membrane show that the conductive polypyrrole layer was uniformly deposited onto the surface of cellulose fibrous networks unlike the polypyrrole–nylon hybrid membrane prepared in the similar way. The polypyrrole-incorporated cellulose networks exhibits steeper electrical conductance increase over the vertical pressure than its nylon counterpart. Our result suggests that the polypyrrole–cellulose hybrid membrane can be applicable for a disposable high-load pressure sensor.
Fabrication and Analysis of a Micro-perfusion System
Mohd. Zahid Ansari(모드 자히드 안사리),Chongdu Cho(조종두),Chae Hun Leem(임채훈),Jeong Mi Ha(하정미) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
This experimental study describes the fabrication and analysis of a micro-perfusion system which can be used in many bioengineering experiments to create rapid, large regional intracellular changes within single ventricular heart cell. The cell swelling was found to be strongly dependent on the perfusion solution osmolarity. This volume change was measured, indirectly, by measuring the cell width change using videomicroscopy and image-analysis software. This microperfusion device can be useful for studying the effects of localized osmotic gradient on myocyte function, estimating intracellular ion diffusion rates, and, possibly, inducing regional changes in other important intracellular ions.
A Study of Skeletal Muscle Biomechanics
Mohd. Zahid Ansari(모드 자히드 안사리),Cho Chongdu(조종두) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Skeletal muscle structures are very complex with about six degrees of hierarchical organization, resulting in tough structures with nonlinear and reversible properties. In this paper work, the muscle structure and muscle material models were studied. Both hyperelastic and viscoelastic material models can be used to model it , but with limited success. The study of skeletal muscle biomechanics is not limited to understand its anatomy and physiology, and hence making better muscle models, only. As an example of biological smart material and structure, the linear electroactive materials like ionic polymers metal composites (IPMCs), electro-active polymers (EAPs),electro-rheological fluids etc. can be used to emulate the biological muscle ie. biomimetics.
이재혁,이세영,김지희,자히드,한승희,홍석원,윤명한 대한화학회 2018 Bulletin of the Korean Chemical Society Vol.39 No.1
Herein, we report the solution-based method for coating sulfur polymers on various substrate materials. First, sulfur polymers were synthesized by reacting elemental sulfur and 1,3-diisopropenylbenzene and dissolved in various organic solvents to search for solvents with good solubility. Next, the trend in film thickness of sulfur-polymer coating was systematically examined using the sulfur-polymer solutions in dichlorobenzene (DCB) and various materials with different surface energy. The nanofibrillar film made of the poly(vinyl alcohol) and poly(acrylic acid) (PVA-PAA) blend exhibited the most uniform/conformal deposition of sulfur polymer via dipping-coating, indicating that the DCB solution is most suitable for the well-controlled deposition of sulfur polymer on nanostructured materials with higher surface energy than 40 mN/m. Finally, the resultant sulfur polymer-coated nanofibrillar film showed high mercury ion uptake capacity (26 mg/g with 50 ppm Hg solution) even with a small amount of sulfur-based adsorbent (20 mg) loading on the film (40 mg). Our study suggests that the sulfur polymer solution can introduce the crucial properties of elemental sulfur on the surface of any conventional materials even with mechanical flexibility and nano/microscale structural complexity.