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120 results on '"Tang, Jingda"'

6. Adhesive anastomosis for organ transplantation

Author

Liu, Kang, Yang, Hang, Huang, Gaobo, Shi, Aihua, Lu, Qiang, Wang, Shanpei, Qiao, Wei, Wang, Haohua, Ke, Mengyun, Ding, Hongfan, Li, Tao, Zhang, Yanchao, Yu, Jiawei, Ren, Bingyi, Wang, Rongfeng, Wang, Kailing, Feng, Hui, Suo, Zhigang, Tang, Jingda, and Lv, Yi

Published
2022
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14. Neural interfaces by hydrogels

Author

Sheng, Hao, Wang, Xiaomeng, Kong, Ning, Xi, Wang, Yang, Hang, Wu, Xiaotong, Wu, Kangling, Li, Chenghai, Hu, Jian, Tang, Jingda, Zhou, Jinxiong, Duan, Shumin, Wang, Hao, and Suo, Zhigang

Published
2019
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26. Phase-separation induced extraordinary toughening of magnetic hydrogels.

Author

Tang, Jingda, Li, Chenghai, Li, Haomin, Lv, Zengyao, Sheng, Hao, Lu, Tongqing, and Wang, T. J.

Subjects
*HYDROGELS, *PHASE separation, *SODIUM hydroxide, *AQUEOUS solutions, *MECHANICAL behavior of materials, *SULFONIC acids
Abstract

Phase separation markedly influences the physical properties of hydrogels. Here, we find that poly (N, N-dimethylacrylamide) (PDMA) hydrogels suffer from phase separation in aqueous sodium hydroxide solutions when the concentration is higher than 2 M. The polymer volume fraction and mechanical properties show an abrupt change around the transition point. We utilize this phase separation mechanism to synthesize tough magnetic PDMA hydrogels with the in-situ precipitation method. For comparison, we also prepared magnetic poly (2-acrylamido-2-methyl-propane sulfonic acid sodium) (PNaAMPS) magnetic hydrogels, where no phase separation occurs. The phase-separated magnetic PDMA hydrogels exhibit an extraordinarily high toughness of ∼1000 J m−2; while non-phase-separated magnetic PNaAMPS hydrogels only show a toughness of ∼1 J m−2, three orders of magnitude lower than that of PDMA hydrogels. This phase separation mechanism may become a new approach to prepare tough magnetic hydrogels and inspire more applications. [ABSTRACT FROM AUTHOR]

Published
2018
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37. Characterizing the Viscoelastic Properties of Hydrogel Thin Films by Bulge Test

Author

Pei Yongmao, Chen Yanfei, Tang Liqun, Tang Jingda, Ai Shigang, and Fang Daining

Subjects
Materials science, Mechanical Engineering, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Viscoelasticity, 0104 chemical sciences, Condensed Matter::Soft Condensed Matter, Mechanics of Materials, Bulge test, Thin film, Composite material, 0210 nano-technology
Abstract

In this work, we carried out bulge test for quantifying the viscoelastic properties of poly (vinyl alcohol) (PVA) thin films with custom-developed apparatus. A viscoelastic bulge deformation (VBD) model based on the elasticity–viscoelasticity correspondence principle and spherical cap equation is established to describe the bulge deformation of polymeric thin films. The VBD model can be used to determine the time-dependent modulus by bulge test for polymeric films. Uniaxial compressive relaxation test and PRONY series fitting method are used to define the constitutive parameters of the VBD equations. We presented two types of VBD models in frequency domain under linear loading and step loading conditions. Through inverse Laplace transformation, the proposed VBD model can effectively predict the bulge deformation of PVA hydrogel thin film. Numerical simulations are also conducted to validate the VBD model under step loading conditions. This work provides a methodology to characterize the viscoelastic properties of polymeric films by bulge test.

Published
2017
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39. Stretchable Seal

Author

Le Floch, Paul, primary, Meixuanzi, Shi, additional, Tang, Jingda, additional, Liu, Junjie, additional, and Suo, Zhigang, additional

Published
2018
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