Fabrication of patterned magnetic hydrogels by ion transfer printing,Soft Matter

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Fabrication of patterned magnetic hydrogels by ion transfer printing
Soft Matter ( IF 2.9 ) Pub Date : 2021-08-05 , DOI: 10.1039/d1sm00869b
Jingda Tang ₁ , Liangsong Zeng ₁ , Zishun Liu ₁

Affiliation

Magnetic hydrogels have found a myriad of applications in bioengineering and soft robotics. As the function of magnetic hydrogels is affected by the distribution of magnetic nanoparticles, it is imperative to propose a strategy for fabricating patterned magnetic hydrogels. However, previous strategies can only achieve very simple distribution by using external magnetic fields to guide the chain-like assembly of nanoparticles. It remains challenging to realize the complex distribution of magnetic nanoparticles in a hydrogel. Here we propose an ion transfer printing strategy to prepare patterned magnetic hydrogels, taking advantage of the ion permeation and nanoparticle precipitation in the hydrogel. The polyacrylamide (PAAm) hydrogel is loaded with Fe²⁺/Fe³⁺ ions and covered with a patterned filter paper with OH⁻ ions to generate Fe₃O₄ nanoparticles locally. The effect of the ion concentration and covering time on the generation of nanoparticles is investigated by using a reaction–diffusion model. Furthermore, the magnetothermal response of the patterned magnetic hydrogels has been characterized to reveal the distribution and thermogenesis of magnetic nanoparticles. We hope that the fabricated magnetic hydrogels with complex patterns can open up new opportunities for applications.

中文翻译：

通过离子转移印刷制造图案化磁性水凝胶

磁性水凝胶已在生物工程和软机器人中发现了无数应用。由于磁性水凝胶的功能受磁性纳米粒子分布的影响，因此必须提出一种制造图案化磁性水凝胶的策略。然而，以前的策略只能通过使用外部磁场来引导纳米颗粒的链状组装来实现非常简单的分布。实现磁性纳米粒子在水凝胶中的复杂分布仍然具有挑战性。在这里，我们提出了一种离子转移印刷策略来制备图案磁性水凝胶，利用水凝胶中的离子渗透和纳米颗粒沉淀。聚丙烯酰胺 (PAAm) 水凝胶负载 Fe ²⁺ /Fe ³⁺离子并用带有 OH ^-离子的图案化滤纸覆盖以局部生成 Fe ₃ O ₄纳米颗粒。通过使用反应扩散模型研究了离子浓度和覆盖时间对纳米颗粒生成的影响。此外，图案化磁性水凝胶的磁热响应已被表征为揭示磁性纳米粒子的分布和产热。我们希望制造的具有复杂图案的磁性水凝胶可以为应用开辟新的机会。

更新日期：2021-08-24

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