Solvent Sorption-Induced Actuation of Composites Based on a Polymer of Intrinsic Microporosity.
Solvent Sorption-Induced Actuation of Composites Based on a Polymer of Intrinsic Microporosity.
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DOI：
10.1021/acsapm.0c01215
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发表时间：
2021-02-12
影响因子：
5
通讯作者：
Bowen CR
中科院分区：
文献类型：
--
作者：
Polak-Kraśna K;Tian M;Rochat S;Gathercole N;Yuan C;Hao Z;Pan M;Burrows AD;Mays TJ;Bowen CR
能够响应于各种外部刺激而致动的材料对于传感器、软机器人和生物医学设备中的应用具有重要意义。在这里，我们提出了一类使用复合材料的致动器的基础上的聚合物的固有微孔（PIM）。通过向PIM中添加活性炭（AX21）填料，该复合材料在溶剂蒸发和润湿时表现出可重复的致动，并且可以实现高度受控的三维致动。卷曲的复合致动器被示出为在暴露于溶剂时打开，并且由于溶剂蒸发而关闭。卷曲和致动的程度通过调节填料的量和溶剂浇铸工艺的蒸发速率来控制，而致动速度通过调节溶剂的类型来控制。使用丙酮、乙醇和二甲基亚砜作为溶剂，证明了由复合材料产生的力和致动速度的范围。纯PIM聚合物在溶剂脱附后产生的最大收缩应力达到12 MPa，极限力超过样品重量的20 000倍。这种形式的复合致动器对湿度和水不敏感，这使得它适用于水性环境，并且可以在很宽的温度范围内生存。这些特性使其成为机器人和医疗应用中各种操作条件的有前途的执行器。的驱动机制进行了讨论，这是基于碳填料颗粒的不对称分布，导致双层结构和各层膨胀和收缩不同的溶剂润湿和蒸发，分别响应。最后，我们展示了应用的致动器作为一个潜在的药物输送车辆，与现有技术相比，具有封装两种药物和减少药物泄漏的能力。
Materials that are capable of actuation in response to a variety of external stimuli are of significant interest for applications in sensors, soft robotics, and biomedical devices. Here, we present a class of actuators using composites based on a polymer of intrinsic microporosity (PIM). By adding an activated carbon (AX21) filler to a PIM, the composite exhibits repeatable actuation upon solvent evaporation and wetting and it is possible to achieve highly controlled three-dimensional actuation. Curled composite actuators are shown to open upon exposure to a solvent and close as a result of solvent evaporation. The degree of curling and actuation is controlled by adjusting the amount of filler and evaporation rate of the solvent casting process, while the actuation speed is controlled by adjusting the type of solvent. The range of forces and actuation speed produced by the composite is demonstrated using acetone, ethanol, and dimethyl sulfoxide as the solvent. The maximum contractile stress produced upon solvent desorption in the pure PIM polymer reached 12 MPa, with an ultimate force over 20 000 times the weight of a sample. This form of the composite actuator is insensitive to humidity and water, which makes it applicable in an aqueous environment, and can survive a wide range of temperatures. These characteristics make it a promising actuator for the diverse range of operating conditions in robotic and medical applications. The mechanism of actuation is discussed, which is based on the asymmetric distribution of the carbon filler particles that leads to a bilayer structure and the individual layers expand and contract differently in response to solvent wetting and evaporation, respectively. Finally, we demonstrate the application of the actuator as a potential drug delivery vehicle, with capacity for encapsulating two kinds of drugs and reduced drug leakage in comparison to existing technologies.
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影响因子：
24.2
作者：
Ionov, Leonid
通讯作者：
Ionov, Leonid
影响因子：
8.4
作者：
Sun, Zhuangzhi;Yang, Lu;Song, Wenlong
通讯作者：
Song, Wenlong
DOI：
10.1007/s10450-019-00065-x
发表时间：
2019-05-01
影响因子：
3.3
作者：
Tian, Mi;Rochat, Sebastien;Mays, Timothy J.
通讯作者：
Mays, Timothy J.
影响因子：
16.6
作者：
Zhang, Lidong;Liang, Haoran;Jacob, Jolly;Naumov, Pance
通讯作者：
Naumov, Pance
DOI：
10.1126/science.1230262
发表时间：
2013-01-11
期刊：
Science (New York, N.Y.)
影响因子：
--
作者：
Ma M;Guo L;Anderson DG;Langer R
通讯作者：
Langer R