To enable reliable but reversible bio-electronics interface adhesion, my group has conducted theoretical, numerical and experimental investigations on an emerging class of dry adhesives with surface craters in both ambient and underwater environment (h).17,18,19,20,21,22 This series of work has been summarized in an invited review paper.23 Sometimes conformability has to be achieved between stiff (due to high-device-density) membranes and non-developable surfaces such as the example of the artificial antenna (i).24 In this case, cuts inspired by kirigami were used to minimize buckle delamination and enhance conformability. Conformable contact affords effective heat transfer at the bio-e interface, which has been modeled in finite element (j) and the model was used to guide the design of the wireless brain patch for tumor treatment (n).25
17 Qiao, S.T., Wang, L., Jeong, H.Y., Rodin, G.J., and Lu, N.S.: ‘Suction effects in cratered surfaces’, J R Soc Interface, 2017, 14, (135), pp. 20170377
18 Wang, L., Qiao, S.T., and Lu, N.S.: ‘Effects of surface tension on the suction forces generated by miniature craters’, Extreme Mechanics Letters, 2017, 15, pp. 130-138
19 Qiao, S.T., Wang, L., Ha, K.H., and Lu, N.S.: ‘Suction effects of craters under water’, Soft Matter, 2018, 14, (42), pp. 8509-8520
20 Wang, L., Ha, K., Qiao, S., and Lu, N.: ‘Suction Effects of Crater Arrays’, Extreme Mechanics Letters, 2019, submitted
21 Lu, N.: ‘Reversible Dry Adhesives’, Soft Robotics, 2016, 3, (3), pp. 99-100
22 Choi, M.K., Park, O.K., Choi, C., Qiao, S., Ghaffari, R., Kim, J., Lee, D.J., Kim, M., Hyun, W., Kim, S.J., Hwang, H.J., Kwon, S.-H., Hyeon, T., Lu, N., and Kim, D.-H.: ‘Cephalopod-Inspired Miniaturized Suction Cups for Smart Medical Skin’, Adv Healthc Mater, 2015, 5, (1), pp. 80-87
23 Wang, L., Ha, K.-H., Rodin, G.J., Liechti, K.M., and Lu, N.: ‘Mechanics of Crater-Enabled Soft Dry Adhesives: A Review’, Frontiers in Mechanical Engineering | Tribology, 2020, 6, pp. 601510
24 Choi, C., Choi, M.K., Liu, S.Y., Kim, M.S., Park, O.K., Im, C., Kim, J., Qin, X.L., Lee, G.J., Cho, K.W., Kim, M., Joh, E., Lee, J., Son, D., Kwon, S.H., Jeon, N.L., Song, Y.M., Lu, N.S., and Kim, D.H.: ‘Human eye-inspired soft optoelectronic device using high-density MoS2-graphene curved image sensor array’, Nat Commun, 2017, 8, pp. 1664
25 Lee, J., Cho, H.R., Cha, G.D., Seo, H., Lee, S., Park, C.K., Kim, J.W., Qiao, S.T., Wang, L., Kang, D., Kang, T., Ichikawa, T., Kim, J., Lee, H., Lee, W., Kim, S., Lee, S.T., Lu, N.S., Hyeon, T., Choi, S.H., and Kim, D.H.: ‘Flexible, sticky, and biodegradable wireless device for drug delivery to brain tumors’, Nat Commun, 2019, 10