4D printing of magneto-responsive shape memory nano-composite for stents

IF 3.7 3区材料科学 Q1 INSTRUMENTS & INSTRUMENTATION

Smart Materials and Structures Pub Date : 2024-09-04 DOI:10.1088/1361-665x/ad7213

Young Bin Kim, Heechan Song, Suji Kim, Heoung-Jae Chun

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Abstract

This study focuses on the 4D printing simulation technique of magneto-responsive shape memory nanocomposite stents. A nanocomposite material was created by incorporating polycaprolactone, a shape memory material, with Fe₃O₄ to enhance magnetic responsiveness and stiffness. Tensile tests were conducted, and the material properties were applied to finite element analysis. Shape memory experiments were also performed to measure the temperature at which shape memory progression occurs due to magnetic response. In the 4D printing simulation, different coefficients of thermal expansion and the measured temperatures were reflected in the sections where shape memory is activated to implement shape memory behavior. The specimen simulation confirmed shape memory behavior progressing from 145 degrees to 3 degrees, while the stent simulation demonstrated satisfactory expansion to a radius of 3 mm. This study proposes a controllable method for implementing shape memory considering temperatures induced by magnetic response, showing potential for various medical device applications.

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用于支架的 4D 打印磁响应形状记忆纳米复合材料

本研究的重点是磁响应形状记忆纳米复合材料支架的 4D 打印模拟技术。通过将聚己内酯（一种形状记忆材料）与 Fe3O4 相结合，创建了一种纳米复合材料，以增强磁响应性和刚度。研究人员进行了拉伸试验，并将材料特性应用于有限元分析。此外，还进行了形状记忆实验，以测量磁响应导致形状记忆发展的温度。在 4D 打印模拟中，不同的热膨胀系数和测量温度反映在激活形状记忆的部分，以实现形状记忆行为。试样模拟证实了形状记忆行为从 145 度发展到 3 度，而支架模拟则令人满意地膨胀到半径 3 毫米。本研究提出了一种考虑到磁响应引起的温度的可控方法来实现形状记忆，为各种医疗设备的应用展示了潜力。

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来源期刊

Smart Materials and Structures 工程技术-材料科学：综合

CiteScore

7.50

自引率

12.20%

发文量

317

审稿时长

3 months

期刊介绍： Smart Materials and Structures (SMS) is a multi-disciplinary engineering journal that explores the creation and utilization of novel forms of transduction. It is a leading journal in the area of smart materials and structures, publishing the most important results from different regions of the world, largely from Asia, Europe and North America. The results may be as disparate as the development of new materials and active composite systems, derived using theoretical predictions to complex structural systems, which generate new capabilities by incorporating enabling new smart material transducers. The theoretical predictions are usually accompanied with experimental verification, characterizing the performance of new structures and devices. These systems are examined from the nanoscale to the macroscopic. SMS has a Board of Associate Editors who are specialists in a multitude of areas, ensuring that reviews are fast, fair and performed by experts in all sub-disciplines of smart materials, systems and structures. A smart material is defined as any material that is capable of being controlled such that its response and properties change under a stimulus. A smart structure or system is capable of reacting to stimuli or the environment in a prescribed manner. SMS is committed to understanding, expanding and dissemination of knowledge in this subject matter.