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Hybrid Metal Nanowire and Polymer Matrix for Triboelectric Nanogenerator
강형석,김형택,김상우,조정호 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
In this manuscript, we studied the surface potential of the metalpolymer hybrid layer and its effect on the TENG performance. As a model system, silver nanowires embedded in two different polymers with positive or negative tribopotentials were prepared. The surface potentials of hybrid system were systematically investigated with Kelvin probe force microscopy. These results indicated that each component in the hybrid surface affected each other because of their work function difference. Two important finding was as follows. First, the surface potential of each polymer shifted dramatically towards that of Ag and the Ag surface potential also shifted towards that of each polymer. Second, higher density of AgNWs increased the charge density induced in the polymer by Ag, which resulted in larger shift in the polymer surface potential. From the TENG measurements, we found that the tribopotential difference between two contact surfaces of the AgNWs-polymer hybrid layer.
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Epitaxial-Growth-Induced Junction Welding of Silver Nanowire Network Electrodes
강형석,송솔지,김정구,조정호 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
In this study, we developed a roll-to-roll Ag electroplating process for metallic nanowire electrodes using a Galvanostatic mode. Metallic nanowire networks [silver nanowires (AgNWs) and copper nanowires (CuNWs)] coated onto a polyethylene terephthalate (PET) film were immersed directly in an electroplating bath containing AgNO3. Silver ions (Ag+ ions) were deposited onto the nanowire surface through application of a constant current via an external circuit. The optimized Ag-electroplated AgNW (Ag-AgNW) films exhibited a sheet resistance of ~19 Ω/sq at an optical transmittance of 90% (550 nm). A transmission electron microscopy (TEM) study confirmed that Ag grew epitaxially on the AgNW surface but a polycrystalline Ag structure was formed on the CuNW surface. The Ag-electroplated metallic nanowire electrodes were successfully applied to various electronic devices such as organic light-emitting diodes, triboelectric nanogenerators, and a resistive touch panel.
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Effect of grafted alkyl groups on aggregation behavior of amphiphilic poly(aspartic acid)
강형석,김종득,한상훈,이옥섭 한국공업화학회 2001 한국공업화학회 연구논문 초록집 Vol.2001 No.-
Biodegradable amphiphilic poly(aspartic acid) (PASP) derivatives containing long alkyl chains were synthesized by thermal condensation, aminolysis by alkylamine, and followed by hydrolysis of remaining succinimide units in polymer backbone. PASP with long alkyl chains formed self-aggregates by ultrasonication and physicochemical properties of self-aggregates were analyzed. Strong hydrophobic interaction by higher amount of grafted alkyl chains induced higher aqueous stability of self-aggregates. Bending of stiff PASP backbone and strong association of alkyl chains were considered to be major factors for determining aqueous stability. Critical aggregation concentration showed linear relationship with degree of substitution of alkyl chains.
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Development of an Anthropomorphic Robot Hand with Size and Motion Range Identical to a Human Hand
강형석,신동헌 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
The anthropomorphic robot hand with the linear actuators consisting of a motor and a lead screw has the stronger grasping power than the hand actuated by motors and insufficient gear reduction. This paper presents the UPS/RPS-RR parallel mechanism to use the linear actuators effectively for the robot hand. It enables us to get the forward/inverse kinematic solutions, while the previous mechanism for the linear actuator failed. Since the grasping motion of the developed hand is composed of the active motion of the proximal phalange and the passive motions of the middle and the distal phalanges, the linkage mechanism is designed to make the motion range of the phalanges the same as that of a human hand. Then, all the phalanges of each finger are bent gradually in the whole motion range from a completely opened hand to a closed hand as a human hand does. This robot hand has four fingers including a thumb. Each finger has 2-DOF and each proximal phalange is actuated by two linear actuators. The palm itself has 2-DOF to make the motion of the thumb and the small metacarpi similar to the natural palm arch of a human hand. Finally, instead of using specially manufactured actuators, the usage of commercial store-bought actuators enables our hand to be a cheaper candidate for the educational robot hand.
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