Complex dynamic substrate control: dual-tone hydrogel photoresists allow double-dissociation of topography and modulus.

Complex dynamic substrate control: dual-tone hydrogel photoresists allow double-dissociation of topography and modulus.
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DOI:
10.1002/adma.201304591
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发表时间:
2014-03-12
期刊:
影响因子:
29.4
通讯作者:
Kasko, Andrea M.
Kasko, Andrea M.
中科院分区:
材料科学1区
文献类型:
--
作者:
Xue, Changying;Wong, Darice Y.;Kasko, Andrea M.

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水凝胶被广泛用作人工细胞外基质,但目前的材料不能完全概括自然组织的几何、力学和动力学特性。在这里,我们报告了一种方法,以动态调整地形和弹性在单一的光响应性水凝胶基质。当暴露在空间控制的光剂量下时,就形成了地形和机械上的微图案化表面。原子力显微镜被用来研究水凝胶表面的表面特征尺寸和弹性模数随辐照时间和波长的变化。根据曝光时间和波长的不同,这些可光降解水凝胶既可以作为正负光致抗蚀剂,也可以作为假负光致抗蚀剂。通过仔细控制微图案化特征的纵横比(表面积与深度),可以在表面形成独特的膨胀诱导的有序微结构。因此,这些双色调水凝胶光致抗蚀剂允许在地形和弹性方面进行动态可调,从而能够制造复杂和各向异性的生物材料。
Hydrogels are widely utilized as artificial extracellular matrices, but current materials are unable to completely recapitulate the geometric, mechanical and dynamic characteristics of natural tissues. Here, we report an approach to dynamically tune both topography and elasticity in a single photoresponsive hydrogel substrate. Upon exposure to spatially controlled doses of light, a topographically and mechanically micropatterned surface forms. Atomic force microscopy was used to investigate changes in topographical feature size and elastic moduli of the hydrogel surface as a function of irradiation time and wavelength. These photodegradable hydrogels can act as both positive and pseudo-negative photoresists, depending on exposure time and wavelength. By carefully controlling the aspect ratio (surface area to depth) of micropatterned features, unique swelling-induced ordered microstructures can be formed on the surface. These dual-tone hydrogel photoresists therefore allow dynamic tunability in both topography and elasticity, enabling the fabrication of complex and anisotropic biomaterials.
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