Dr. Jun Lu Profile

Dr. Jun Lu

at Chonnam National Univ

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Publications (3)

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Proceedings Article | 21 October 2009 Paper

An ionic polymer-metal composite actuator based on PSMI-incorporated PVDF with chemical stability and performance durability

Jun Lu, Sang-Gyun Kim, Sunwoo Lee, Il-Kwon Oh

Proceedings Volume 7493, 74934W (2009) https://doi.org/10.1117/12.838279

KEYWORDS: Actuators, Ferroelectric polymers, Polymers, Platinum, Polymeric actuators, Particles, Composites, Polymer thin films, Electroactive polymers, Artificial muscles

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To develop artificial muscles with improved performance, a novel ionic polymer-metal composite (IPMC) actuator was developed by employing the newly-synthesized ionic networking film of poly (styrene-alt-maleimide) (PSMI)- incorporated poly (vinylidene fluoride) (PVDF). Scanning electron microscope and transmission electron microscopy revealed that much smaller and more uniform nano-sized platinum particles were formed on the surfaces of the film as well as within its polymer matrix after the electroless-plating process. Fourier transform infrared results suggested that no hydrolysis occurred for the as-prepared film actuator before and after the exposure to the elevated PH solutions at 25°C for 48h. The new actuator showed much larger tip displacement than that of a Nafion-based counterpart under the applied electrical stimulus, and overcame the back relaxation of the traditional IPMC actuator under the constant voltage. The current actuator was operated over 6.5h at high-frequency sinusoidal excitation, and its tip displacement was still comparable to that of the referenced Nafion actuator when the test was terminated. The excellent electromechanical performance is due to the inherent large ionic-exchange capacity and the unique hydrophilic nano-channels of the ionic networking film. Furthermore, the working principle of the developed IPMC actuator is thought to be based on a combination of piezoelectricity and ionic transport. The film of PSMI-incorporated PVDF has some advantages over the most widely-used Nafion-based one by diversifying niche applications in biomimetic motion, and the present study is believed to open a new avenue for the design and fabrication of the electro-active polymer film with unique functional properties.

Proceedings Article | 10 April 2008 Paper

Novel electro-active polymer actuator based on ionic networking membrane of PSMI-incorporated PVDF

Jun Lu, Sang-Gyun Kim, Sunwoo Lee, Il-Kwon Oh

Proceedings Volume 6927, 69271X (2008) https://doi.org/10.1117/12.774917

KEYWORDS: Actuators, Platinum, Ferroelectric polymers, Particles, Polymers, Electroactive polymers, Scanning electron microscopy, Transmission electron microscopy, Resistance, Electrodes

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There is growing interest in searching for new smart materials, which responds to external stimuli by changes in shape or size and can be utilized in biomimetic motions. To develop artificial muscles with improved performance, a novel electro-active polymer actuator was prepared by employing the newly-synthesized ionic networking membrane of poly (styrene-alt-maleimide) (PSMI)-incorporated poly (vinylidene fluoride) (PVDF). Scanning electron microscope (SEM) and transmission electron microscopy (TEM) revealed that much smaller and more uniform platinum particles were formed on the surfaces of the actuator fabricated through the electroless-plating technique as well as within its polymer matrix. Under constant voltage excitation, the tip displacement of the actuator constructed with the ionic network membrane was several times larger than that of its Nafion^(R) counterpart of similar thickness without straightening-back. Under the stimulus of alternating-current voltage, the newly-developed actuator displayed an excellent harmonic performance, and the measured mechanical displacement was comparable to that of the Nafion^(R)-based actuator. The nice electromechanical response, especially the large tip displacement, is attributed to two factors: the inherent large ionic-exchange capacity and the unique hydrophilic nanochannels of the ionic networking membrane. The actuator of PSMI-incorporated PVDF has some advantages over the most widely-used traditional Nafion-based actuator by diversifying niche applications in biomimetic motion, and the present study may possibly open a new avenue for the design and fabrication of the electro-active polymer with unique functional properties.

Proceedings Article | 1 November 2007 Paper

Ionic polymer-metal composite actuators employing sulfonated poly (styrene-ethylene-butylene-styrene) as ionic-exchange membranes

Xuan-Lun Wang, Il-Kwon Oh, Jun Lu, Jin-Hun Ju, Sun-Woo Lee

Proceedings Volume 6423, 64230V (2007) https://doi.org/10.1117/12.779343

KEYWORDS: Actuators, Polymers, Composites, Platinum, Electroactive polymers, Polymeric actuators, Electroless plating, Scanning electron microscopy, Biomimetics, Artificial muscles

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There is growing interest in biomimetic motions by employing ionic polymer-metal composites (IPMCs) as the candidates for the fabrication of artificial muscle. However, the membrane materials currently used in IPMC actuators have been limited to a few commercially available perfluorinated ionic polymers, such as Nafion, and they suffer from several shortcomings among which their high cost presents a major obstacle for wide application. With excellent proton conductivity and high water uptake capacity, commercially available Sulfonated poly (styrene-ethylene-butylene-styrene) (SEBS) of low cost has been investigated for many years as a fuel cell membrane. Herein, we report the preparation of a novel IPMC actuator based on the sulfonated SEBS (SSEBS) membrane. The platinum electrodes of the SEBS actuators were obtained with electroless plating procedure, and the cation exchange with lithium was performed by soaking the composite membranes into a 1.5N LiCl solution. The surface and cross-sectional morphologies of the SSEBS actuators were observed by using scanning electron microscopy (SEM), which revealed that the platinum layer up to 8µm was deposited on the top and bottom surfaces of the SSEBS membrane. The electromechanical bending responses were investigated under alternating current excitations with various driving frequencies and voltage amplitudes, which showed high electrical strains under sinusoidal signal. The effect of the membrane thickness on the performance of the actuators was also addressed in this presentation. This kind of IPMC has great potentials for the applications in biomimetic sensors and actuators, which can be utilized to mimic the locomotion of fish and insects and can be applied to micro-robots and bio-medical devices as well.

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