“手到擒来”的微观“快递员”（科技瞭望）

Core Viewpoint - The article discusses the development of a 3D micro-nano robot by the Institute of Physics, Chinese Academy of Sciences, which can perform precise tasks in the microscopic world, paving the way for advancements in precision medicine [1][2]. Group 1: Micro-Nano Robot Overview - Micro-nano robots are intelligent miniature machines that can perform tasks such as movement, rotation, and the manipulation of small particles or cells, offering significant potential in fields like precision medicine, environmental remediation, and micro-manufacturing [2]. - The new design overcomes limitations of existing micro-nano robots, which often use single material systems and struggle with multi-stimulus control in complex environments [2][5]. Group 2: Design and Functionality - The robot is designed in the shape of a hand, allowing for flexible observation and manipulation of target particles, with a structure that opens and closes to enhance functionality [2][5]. - It utilizes femtosecond laser direct writing technology to create various micro-nano structures from different materials, enabling each part to have distinct functions [5]. Group 3: Operational Mechanism - The robot operates by responding to changes in pH levels in its environment, allowing its "hand" to open or close automatically, similar to a human hand reacting to heat [6]. - It can navigate around obstacles and accurately locate target particles or cells, successfully performing tasks such as grabbing and releasing under specific environmental conditions [6]. Group 4: Performance and Reliability - Experimental results show that the robot can successfully manipulate polystyrene microspheres and human kidney cancer cells, achieving a maximum speed of 65.56 micrometers per second while maintaining reliable performance after multiple cycles of pH changes [6][7]. - The robot's design addresses the limitations of traditional micro-nano robots, enabling more complex operations in the microscopic realm [7]. Group 5: Future Applications - The micro-nano robot has potential applications in medicine, such as targeted drug delivery and minimally invasive surgeries, as well as in environmental cleanup and micro-manufacturing [7]. - It could serve as a micro-operation platform for cell sorting, injection, and mechanical studies, contributing to advancements in both medical and scientific research [7].