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        A Novel Rotary Ultrasonic Motor Using an In-plane Traveling Wave

        Yin Wang,Jiamei Jin,Weiqing Huang 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.41

        In this paper, a novel rotary ultrasonic motor is designed for the requirements of robot joints. This motor features a stator, which contains both a hollow cylinder and a rod-shaped piezo vibrator utilized to excite two in-plane modes of the hollow cylinder, and a rotor, which is composed of two cones and a shaft. By exciting the two orthogonal in-plane modes of a hollow cylinder with a phase difference of π/2 in excited signal, an in-plane traveling wave is formed in the hollow cylinder. The rotor is driven when two cones are pressed to the boundary of the hollow cylinder by a spring. Test results of the prototype show that its maximum non-load rotation speed can reach 120 rev/min with a maximum output torque of 0.2 Nm.

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        Nanocellulose-Based Hybrid Hydrogels as Flexible Cathodes of Aqueous Zn-Ion Batteries

        Jingze Liu,Jiamei Lai,Xingyuan Huang,Hesheng Liu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.4

        Cellulose nanofibers, detached from natural plants, are very promising for applications in the energy storage devices. The swelling of cellulose nanofibers provides abundant paths in the hybrid hydrogels for ion diffusion towards the active material. There is an optimal composition of 50 wt.% for cellulose nanofibers in the hybrid hydrogels due to the balance between ion diffusion and electron transport, that is, facilitated by conductive graphite nanoplatelets. The aqueous Zn-ion batteries, assembled from the optimized hybrid hydrogels, have a high-specific capacity of 149.4 mAh/g and energy density of 113.2mWh/g, respectively. Moreover, high flexibility of the aqueous Zn-ion batteries is guaranteed by the hybrid hydrogels. There is only a little decay in the electrochemical performance under mechanical bending.

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        A Novel Hybrid Polyhedral Oligomeric Silsesquioxane-Based Copolymer with Zwitterion: Synthesis, Characterization, Self-Assembly Behavior and pH Responsive Property

        Yiting Xu,Jiamei Huang,Yuntong Li,Meijie Wang,Ying Cao,Conghui Yuan,Birong Zeng,Lizong Dai 한국고분자학회 2017 Macromolecular Research Vol.25 No.8

        A novel zwitterionic hybrid amphiphilic copolymer containing polyhedral oligomericsilsesquioxane (POSS), and poly(methacrylate isobutyl POSS)-b-poly (3-dimethyl(methacryloyloxyethyl) ammonium propane sulfonaten-co-2-(diethylamino) ethyl methacrylate-co-styrene) (PMAiBuPOSS-b-P(DMAPS-co-DMAEMAco- St)), was prepared by the ring open reaction of 1, 3-propane sultone with tertiary amine on the precursor polymer. This hybrid copolymer could self-assemble into spherical micelle with a relatively narrow size distribution. The micelle size exhibited a great dependence on pH, as the size of the micelles was of evidently decreases with the increase of the pH value. Controllable release of pyrene from the micelles was investigated by fluorescent emission spectra. Micelles with more zwitterionic units would lead to less pyrene release and longer equilibrium time. The protein adsorption resistance of the micelles was tested by mixing them with fetal bovine serum. The antifouling ability was improved by increasing the number of zwitterionic units as well as decreasing the number of DMAEMA units. This novel hybrid amphiphilic random copolymer with the pH-responsive and anti-protein-fouling ability, can be potentially used for drug carriers for controlled release.

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