Programmable microscale stiffness pattern of flat polymeric substrates by temperature-memory technology

Jiang, Yi; Mansfeld, Ulrich; Kratz, Karl; Lendlein, Andreas

doi:10.1557/mrc.2019.24

Cited by 2 publications

(2 citation statements)

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“…The fixation ratios are investigated to be higher than 100% for the medium depth and large depth programing at lower temperatures on compressed microcuboids. A similar observation has been reported for compression programing of the cPEVA microstructured surface, and this may be introduced by crystallization-induced contraction during fixation under higher stress, which is more obvious for the compressed microcuboids that have higher orientation in the crystalline structures …”

Section: Resultssupporting

confidence: 77%

“…A similar observation has been reported for compression programing of the cPEVA microstructured surface, and this may be introduced by crystallization-induced contraction during fixation under higher stress, which is more obvious for the compressed microcuboids that have higher orientation in the crystalline structures. 26 The shape recovery of the nanocavities induced by step-wise online heating was observed using AFM, and their height images are shown in Figure S2. It can be observed that all the programed cavities turn back to a smooth surface during heating, and the recovery route varies among different samples.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Reconfigurable and Actuating Microbowls with Variable Steps

Liu

Fang

2022

ACS Appl. Polym. Mater.

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Polymeric microdevices with bioinspired multifunctional features like defined geometrical actuation or spatially segregated surface properties are attractive with potential applications in sensors, microfluidic systems, on-demand carriers, and biomedical devices. In this regard, here, we aim at enhancing the programability of multi-shape memory micro-objects using atomic force microscopy (AFM) to achieve a sequential shape reconfiguration or actuation at different geometrical levels on demand. Temperature-memory polymer-based microcuboids were designed and fabricated as a model system. The first step in the programing of the microcuboids was achieved by compression between glass slides with external force at selected programing temperatures T p. Then, microbowls were generated by AFM nanoindentation using a spherical tip on the surface of the microcuboids to create temporary nanocavities at different T p,inds. The geometry and surface structure of the microcuboids was analyzed by AFM height images. By varying T p/T p,inds and the sequence of the procedure, multiple nanocavities can be generated on the same microbowl to achieve sequential full recovery and actuations of 2–6%. In addition, a demonstration of microbowl trapping and sequential elevating submicron particles was performed to prove the concept of the on-demand carrier and release system. The technology presented in this work can inspire future design of multifunctional micro-objects in order to fulfill complex tasks with shape reconfiguration or actuation functions on micro-/nanolevel.

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Section: Resultssupporting

confidence: 77%

Section: ■ Results and Discussionmentioning

confidence: 99%