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Controllable Bending of Bi-hydrogel Strips with Differential Swelling

  • Yi Wu
  • Xingpeng Hao
  • Rui Xiao
  • Ji Lin
  • Zi Liang Wu
  • Jun Yin
  • Jin QianEmail author
Article
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Abstract

Bi-hydrogel strips consisting of a highly swelling layer and a non-swelling layer are investigated in this study, in which the differential swelling capabilities and mismatch strain in the composite structure drive the strips into a bending configuration when being exposed to solvents. A modified analytical model originated from Timoshenko theory on bi-material beam is proposed to predict the swelling-induced bending shape of the bi-hydrogel strips, with explicit relations of bending curvature and mid-span deflection versus mismatch strain. Different sets of experiments were performed to verify the analytical model and its solutions, in which the swelling-induced mismatch strain was systematically tuned by the selection of saline concentration. The broad agreements between the theoretical and experimental results indicate that the modified analytical model can be used to guide the design of morphing elements by modulating layer-by-layer mismatches in gel composites to produce precise and complex shape transformations for practical applications.

Keywords

Bi-hydrogel strip Hydrogel swelling Mismatch strain Shape morphing Analytical model 

Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (91748209, 11672268 and 11621062), the Zhejiang Provincial Natural Science Foundation of China (LR16A020001) and the Fundamental Research Funds for Central Universities of China.

References

  1. 1.
    Yang W, Wang HT, Li TF, et al. X-mechanics: an endless frontier. Sci China Phys Mech. 2019;62(1):014601.CrossRefGoogle Scholar
  2. 2.
    Hu XL, Zhang YQ, Xie ZG, et al. Stimuli-responsive polymersomes for biomedical applications. Biomacromolecules. 2017;18(3):649–73.CrossRefGoogle Scholar
  3. 3.
    Cai GF, Wang JX, Qian K, et al. Extremely stretchable strain sensors based on conductive self-healing dynamic cross-links hydrogels for human-motion detection. Adv Sci. 2016;4(2):1600190.CrossRefGoogle Scholar
  4. 4.
    Liu XY, Yuk H, Lin ST, et al. 3D printing of living responsive materials and devices. Adv Mater. 2018;30(4):1704821.CrossRefGoogle Scholar
  5. 5.
    Mannoor MS, Jiang Z, James T, et al. 3D printed bionic ears. Nano Lett. 2013;13(6):2634–9.CrossRefGoogle Scholar
  6. 6.
    Leong TG. Tetherless thermobiochemically actuated microgrippers. Proc Natl Acad Sci USA. 2009;106(3):703–8.CrossRefGoogle Scholar
  7. 7.
    Gladman AS, Matsumoto EA, Nuzzo RG, et al. Biomimetic 4D printing. Nat Mater. 2016;15(4):413–8.CrossRefGoogle Scholar
  8. 8.
    Fu FF, Shang LR, Chen ZY, et al. Bioinspired living structural color hydrogels. Sci Rob. 2018;3(16):8580.CrossRefGoogle Scholar
  9. 9.
    Yuk H, Lin ST, Ma C, et al. Hydraulic hydrogel actuators and robots optically and sonically camouflaged in water. Nat Commun. 2017;8:14230.CrossRefGoogle Scholar
  10. 10.
    Pu X, Liu MM, Chen XY. Ultrastretchable, transparent triboelectric nanogenerator as electronic skin for biomechanical energy harvesting and tactile sensing. Sci Adv. 2017;3(5):1700015.CrossRefGoogle Scholar
  11. 11.
    Zhang YS, Khademhosseini A. Advances in engineering hydrogels. Science. 2017;356(6337):eaaf3627.CrossRefGoogle Scholar
  12. 12.
    Thoniyot P, Tan MJ, Karim AA, et al. Nanoparticle-hydrogel composites: concept, design, and applications of these promising, multi-functional materials. Adv Sci. 2015;2(1–2):1400010.CrossRefGoogle Scholar
  13. 13.
    Zhang H, Guo XG, Wu J, et al. Soft mechanical metamaterials with unusual swelling behavior and tunable stress-strain curves. Sci Adv. 2018;4(6):eaar8535.CrossRefGoogle Scholar
  14. 14.
    Wu L, Mao GY, Nian GD, et al. Mechanical characterization and modeling of sponge-reinforced hydrogel composites under compression. Soft Matter. 2018;14(21):4355–63.CrossRefGoogle Scholar
  15. 15.
    Lee JB, Peng S, Yang D, et al. A mechanical metamaterial made from a DNA hydrogel. Nat Nanotechnol. 2012;7(12):816–20.CrossRefGoogle Scholar
  16. 16.
    Ning X, Wang XJ, Zhang Y, et al. Assembly of advanced materials into 3D functional structures by methods inspired by origami and kirigami: a review. Adv Mater Interfaces. 2018;5:1800284.CrossRefGoogle Scholar
  17. 17.
    Shahram J, Molly MG, Amir AZ. Multimaterial control of instability in soft mechanical metamaterials. Phys Rev Appl. 2018;9(6):064013.CrossRefGoogle Scholar
  18. 18.
    Ionov L. Hydrogel-based actuators: possibilities and limitations. Mater Today. 2014;17(10):494–503.CrossRefGoogle Scholar
  19. 19.
    Peng X, Wang HL. Shape changing hydrogels and their applications as soft actuators. J Polym Sci Part B Polym Phys. 2018;56(19):1314–24.CrossRefGoogle Scholar
  20. 20.
    Jeon SJ, Hauser AW, Hayward RC. Shape-morphing materials from stimuli-responsive hydrogel hybrids. Acc Chem Res. 2017;50(2):161–9.CrossRefGoogle Scholar
  21. 21.
    Zhao ZA, Kuang X, Yuan C, et al. Hydrophilic/hydrophobic composite shape-shifting structures. ACS Appl Mater Interfaces. 2018;10(23):19932–9.CrossRefGoogle Scholar
  22. 22.
    Amirali N, Hakan A, Kwan L, et al. Bioinspired 3D structures with programmable morphologies and motions. Nat Commun. 2018;9(1):3705.CrossRefGoogle Scholar
  23. 23.
    Wang ZJ, Zhu CN, Hong W, et al. Cooperative deformations of periodically patterned hydrogels. Sci Adv. 2017;3(9):1700348.CrossRefGoogle Scholar
  24. 24.
    Ma PY, Niu BF, Lin J, et al. Sequentially controlled deformations of patterned hydrogels into 3D configurations with multilevel structures. Macromol Rapid Commun. 2019;40(3):1800681.CrossRefGoogle Scholar
  25. 25.
    Wang ZJ, Hong W, Wu ZL, et al. Site-specific pre-swelling-directed morphing structures of patterned hydrogels. Angew Chem. 2017;56(50):15974–8.CrossRefGoogle Scholar
  26. 26.
    Zheng SY, Shen YY, Zhu FB, et al. Programmed deformations of 3D-printed tough physical hydrogels with high response speed and large output force. Adv Funct Mater. 2018;28(37):1803366.CrossRefGoogle Scholar
  27. 27.
    Hu Z, Zhang X, Li Y. Synthesis and application of modulated polymer gels. Science. 1995;269(5223):525–7.CrossRefGoogle Scholar
  28. 28.
    Zhao ZA, Wu JT, Mu XM, et al. Desolvation induced origami of photocurable polymers by digit light processing. Macromol Rapid Commun. 2017;38(13):1600625.CrossRefGoogle Scholar
  29. 29.
    Zhao ZA, Wu JT, Mu XM, et al. Origami by frontal photopolymerization. Sci Adv. 2017;3(4):1602326.CrossRefGoogle Scholar
  30. 30.
    Kuang X, Roach DJ, Wu JT, et al. Advances in 4D printing: materials and applications. Adv Funct Mater. 2019;29(2):1805290.CrossRefGoogle Scholar
  31. 31.
    Ding Z, Yuan C, Peng XR, et al. Direct 4D printing via active composite materials. Sci Adv. 2017;3(4):e1602890.CrossRefGoogle Scholar
  32. 32.
    Timoshenko S. Analysis of bimetal thermostats. J Opt Soc Am. 1925;11:233–55.CrossRefGoogle Scholar
  33. 33.
    Hong W, Zhao XH, Zhou JX, et al. A theory of coupled diffusion and large deformation in polymeric gels. J Mech Phys Solids. 2008;56(5):1779–93.CrossRefzbMATHGoogle Scholar
  34. 34.
    Guo W, Li ME, Zhou JX. Modeling programmable deformation of self-folding all-polymer structures with temperature-sensitive hydrogels. Smart Mater Struct. 2013;22(11):115028.CrossRefGoogle Scholar
  35. 35.
    Ding ZW, Toh W, Hu JY, et al. A simplified coupled thermo-mechanical model for the transient analysis of temperature-sensitive hydrogels. Mech Mater. 2016;97:212–27.CrossRefGoogle Scholar
  36. 36.
    Liu ZS, Toh W, Ng TY. Advances in mechanics of soft materials: a review of large deformation behavior of hydrogels. Int J Appl Mech. 2015;7(05):1530001.CrossRefGoogle Scholar
  37. 37.
    Morimoto T, Ashida F. Temperature-responsive bending of a bilayer gel. Int J Solids Struct. 2015;56:20–8.CrossRefGoogle Scholar
  38. 38.
    Drozdov AD, Christiansen JD. The effects of pH and ionic strength of swelling of cationic gels. Int J Appl Mech. 2016;8(05):1650059.CrossRefGoogle Scholar
  39. 39.
    Attaran A, Brummund J, Wallmersperger T. Modeling and simulation of the bending behavior of electrically-stimulated cantilevered hydrogels. Smart Mater Struct. 2015;24(3):035021.CrossRefGoogle Scholar
  40. 40.
    Xiao R. Modeling mismatch strain induced self-folding of bilayer gel structures. Int J Appl Mech. 2016;08(07):1640004.CrossRefGoogle Scholar

Copyright information

© The Chinese Society of Theoretical and Applied Mechanics 2019

Authors and Affiliations

  • Yi Wu
    • 1
  • Xingpeng Hao
    • 2
  • Rui Xiao
    • 1
  • Ji Lin
    • 1
  • Zi Liang Wu
    • 2
  • Jun Yin
    • 3
  • Jin Qian
    • 1
    Email author
  1. 1.Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province, Department of Engineering MechanicsZhejiang UniversityHangzhouChina
  2. 2.MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and EngineeringZhejiang UniversityHangzhouChina
  3. 3.State Key Laboratory of Fluid Power and Mechatronic Systems, Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province, School of Mechanical EngineeringZhejiang UniversityHangzhouChina

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