Self-folding thermo-magnetically responsive soft microgrippers.
Self-folding thermo-magnetically responsive soft microgrippers.
复制标题
DOI：
10.1021/am508621s
复制
发表时间：
2015-02-11
影响因子：
9.5
通讯作者：
Gracias, David H.
中科院分区：
文献类型：
--
作者：
Breger, Joyce C.;Yoon, ChangKyu;Xiao, Rui;Kwag, Hye Rin;Wang, Martha O.;Fisher, John P.;Nguyen, Thao D.;Gracias, David H.
水凝胶，如聚（n -异丙基丙烯酰胺-共丙烯酸）（pNIPAM-AAc）可以通过光制模来创建广泛的可驱动和自折叠微结构。机械运动源于这种交联水凝胶在不同的热或pH环境下的大而可逆的膨胀反应。这种作用是由它们的网络结构和大应变能力促成的。然而，由于这种水凝胶的低模量，它们在外科切除或机器人任务（如拾取和放置）中具有有限的抓取能力。通过实验和建模，我们设计、制造和表征了光图案的、自折叠的功能微夹持器，它结合了可膨胀的、光交联的pNIPAM-AAc软水凝胶和不可膨胀的、坚硬的分段聚合物（富马酸聚丙烯，PPF）。我们还表明，我们可以将氧化铁（Fe2O3）纳米颗粒嵌入多孔水凝胶层，使微夹持器能够响应并利用磁场进行远程引导。利用有限元模型，研究了水凝胶层和刚性聚合物层的厚度和模量对微夹持器自折叠特性的影响。最后，我们阐述了这些聚合物微夹持器在软机器人和外科应用中的操作和功能。
Hydrogels such as poly(N-isopropylacrylamide-co-acrylic acid) (pNIPAM-AAc) can be photopatterned to create a wide range of actuatable and self-folding microstructures. Mechanical motion is derived from the large and reversible swelling response of this cross-linked hydrogel in varying thermal or pH environments. This action is facilitated by their network structure and capacity for large strain. However, due to the low modulus of such hydrogels, they have limited gripping ability of relevance to surgical excision or robotic tasks such as pick-and-place. Using experiments and modeling, we design, fabricate, and characterize photopatterned, self-folding functional microgrippers that combine a swellable, photo-cross-linked pNIPAM-AAc soft-hydrogel with a nonswellable and stiff segmented polymer (polypropylene fumarate, PPF). We also show that we can embed iron oxide (Fe2O3) nanoparticles into the porous hydrogel layer, allowing the microgrippers to be responsive and remotely guided using magnetic fields. Using finite element models, we investigate the influence of the thickness and the modulus of both the hydrogel and stiff polymer layers on the self-folding characteristics of the microgrippers. Finally, we illustrate operation and functionality of these polymeric microgrippers for soft robotic and surgical applications.
登录
查看更多内容
影响因子：
29.4
作者：
Maeda, Shingo;Hara, Yusuke;Hashimoto, Shuji
通讯作者：
Hashimoto, Shuji
影响因子：
15
作者：
Lutz, Jean-Francois;Akdemir, Oezguer;Hoth, Ann
通讯作者：
Hoth, Ann
影响因子：
13.3
作者：
Guo, J;Yang, WL;Fu, SK
通讯作者：
Fu, SK
影响因子：
6.2
作者：
Kim, S;Healy, KE
通讯作者：
Healy, KE
影响因子：
14
作者：
Fisher, JP;Dean, D;Mikos, AG
通讯作者：
Mikos, AG