浸润性“Janus”微米板阵列表观浸润性的磁场调控

Materials those can change in chemical composition or molecular configurations to an external stimulus, such as light, thermal, electric and chemical, and further lead to the change in wettability have shown great potential in application aspects. However, the utilization of those stimuli could alter the chemical and/or biological environment of the system to a certain extent, which restricts the uses in areas such as medical materials and drug delivery. In this project, PDMS micro-plate array with Fe3O4 microspheres embedded at the top of each micro-plate will be fabricated. To render the micro-plate with hydrophilicity on one side and hydrophobility on the other side by certain surface modification methods, “Janus” wettability of the micro-plate will be obtained. Upon the application of an external magnetic field, the micro-plate array will bent, and expose one side to the top. By changing the direction of the magnetic field, one can selectively control the bending direction; thereby, switching the surface wettability between hydrophilic and hydrophobic. On top of this, by controlling the bending angle of the micro-plate on the same side, the surface wettability will be consequently altered. Hence, a range of different wettability of the surface can be obtained. The advantages of adjusting the surface wettability via a magnetic field are repeatable, reversible, safe, and remote controllable, which could meet the pressing need of certain applications.

在浸润性的研究工作中，智能响应的浸润性材料可以在光、热、电、化学等外界刺激下发生化学组成或分子结构的变化，从而改变表面浸润性。然而，以上刺激响应方式难免会对体系的化学生物环境有所影响，因此在医用材料及药物传输等生物医药领域的应用中受到限制。本课题将制备顶端嵌有顺磁性Fe3O4颗粒的PDMS微米板阵列，并通过对板的两面进行不同的亲疏水修饰使微米板具有一面亲水、另一面疏水的浸润性“Janus”结构。当对微米板阵列施加磁场时，微米板阵列会向着磁力线密集的方向弯曲倒伏。通过控制磁场方向，可以选择性地使微米板的亲水面向上或疏水面向上，从而调控微米板阵列的表观浸润性。调节不同的微米板弯曲角度，还可以研究阵列的滚动角各向异性。本项目的开展可充分体现磁场调控重复可逆、无接触、对生物和化学环境影响小的优势,以满足浸润性调控在生物医药方面的一些特殊应用需求。

在浸润性的研究工作中，智能响应的浸润性材料可以在光、热、电、化学等外界刺激下发生化学组成或分子结构的变化，从而改变表面浸润性。然而，以上刺激响应方式难免会对体系的化学生物环境有所影响，因此在医用材料及药物传输等生物医药领域的应用中受到限制。本课题将制备顶端嵌有顺磁性Fe3O4颗粒的PDMS微米板阵列，并通过对板的两面进行不同的亲疏水修饰使微米板具有一面亲水、另一面疏水的浸润性“Janus”结构。当对微米板阵列施加磁场时，微米板阵列会向着磁力线密集的方向弯曲倒伏。通过控制磁场方向，可以选择性地使微米板的亲水面向上或疏水面向上，从而调控微米板阵列的表观浸润性。调节不同的微米板弯曲角度，还可以研究阵列的滚动角各向异性。本项目的开展可充分体现磁场调控重复可逆、无接触、对生物和化学环境影响小的优势,以满足浸润性调控在生物医药方面的一些特殊应用需求。

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