Smart changing microparticles with controllable shapes have attracted considerable attentions due to their potential applications in microactuators, micromotors and biomedical devices. In this work, a shape memory microsphere based on cellulose acetate (CA) was developed by a simple emulsion solvent evaporation method to perform on-demand shape switch under heat stimulus. The morphology of CA microparticles before and after thermal programing were carefully investigated by both optical microscope and scanning electron microscope, demonstrating their excellent microscopic shape memory properties and shape reconfiguring ability as needed. The temporary and permanent shapes of CA microparticles both can be changed arbitrarily by regulating the stretching condition via a film stretching process to meet various requests. Considering the more convenience of near infrared (NIR) light than direct heat for application, the additional NIR light-induced microscopic shape memory performance was realized by the introduction of multi-walled carbon nanotube into CA microspheres, which can further improve their versatile application potential in various fields.

具有可控形状的智能变化微粒由于其在微致动器，微电机和生物医学设备中的潜在应用而备受关注。在这项工作中，通过简单的乳液溶剂蒸发方法开发了基于醋酸纤维素（CA）的形状记忆微球，以在热刺激下执行按需形状转换。通过光学显微镜和扫描电子显微镜仔细研究了CA微粒在热编程之前和之后的形貌，证明了它们具有优异的微观形状记忆特性和所需的形状重构能力。通过经由膜拉伸工艺调节拉伸条件以满足各种要求，可以任意改变CA微粒的临时形状和永久形状。