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arXiv 2202.09754cond-mat.softcond-mat.mtrl-sci
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稀聚合物网络中由渗流诱导的凝胶-凝胶相分离

Percolation induced gel-gel phase separation in a dilute polymer network

Shohei Ishikawa, Yasuhide Iwanaga, Takashi Uneyama, Xiang Li, Hironori Hojo, Ikuo Fujinaga, Takuya Katashima, Taku Saito, Ungil Chung, Naoyuki Sakumichi, Takamasa Sakai

AI总结:

本研究发现稀聚合物体系的网络形成作为耗散过程,可在可混溶聚合物-水体系中引发渗流诱导的凝胶-凝胶相分离,该结构具介尺度双连续特征且能诱导皮下脂肪生长,其机制与宇宙大尺度结构形成类似,为耗散结构的功能应用提供新可能。

摘要:

宇宙大尺度结构、动物群和活体组织都是由耗散过程形成的非平衡有序系统。尽管这类系统具有独特性,但耗散结构的实现仍然十分困难。本文中,我们报道稀体系中的网络形成过程是一种耗散过程,会在一种典型的可混溶聚合物-水体系中引发渗流诱导的凝胶-凝胶相分离(GGPS)。该稀体系在渗流阈值处形成单相结构,随着时间推移、网络形成不断推进,最终会在更长的时间尺度上分离为两个凝胶相。具有GGPS特性的稀水凝胶呈现出出人意料的介尺度双连续结构,且能在皮下诱导脂肪生长。从稀体系中的吸引相互作用驱动相分离这一点来看,GGPS的形成机制与宇宙大尺度结构的形成机制具有相似性。这一独特现象揭示了耗散结构实现高级功能的可能性,将推动耗散结构相关领域的研究。

英文摘要:

Cosmic large-scale structures, animal flocks, and living tissues are non-equilibrium organized systems created by dissipative processes. Despite the uniqueness, the realization of dissipative structures is still difficult. Herein, we report that a network formation process in a dilute system is a dissipative process, leading to percolation induced gel-gel phase separation (GGPS) in a prominent miscible polymer-water system. The dilute system, which forms a monophase structure at the percolation threshold, eventually separates into two gel phases in a longer time scale as the network formation progresses. The dilute hydrogel with GGPS exhibits an unexpected mesoscale co-continuous structure and induces adipose growth in subcutaneous. The formation mechanism of GGPS and a cosmic large-scale structure is analogous, in terms of attractive interactions in a diluted system driving phase separation. This unique phenomenon unveils the possibility of dissipative structures enabling advanced functionalities and will stimulate research fields related to dissipative structures.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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