In recent years, femtosecond laser two-photon polymerization technology has been widely used as a true three-dimensional machining method with nanometer precision to fabricate a variety of functional microstructures, which show broad application prospects in the fields of micro- and nano-optics, micro-sensors and micro-machine systems. However, it is still challenging to utilize femtosecond lasers to realize composite multi-material processing and further construct micro-nano-machines with multi-modalities. In view of this, Prof. Wu Dong's team at the Micro and Nano Engineering Laboratory of the University of Science and Technology of China (USTC) proposed a femtosecond laser two-in-one writing multi-material processing strategy to fabricate micromachined joints composed of temperature-sensitive hydrogels and metal nanoparticles, and subsequently developed multi-jointed humanoid micromachines with multiple deformation modes (>10). Travay la te pibliye 17 jiyè anba tit "Mikroaktuateur milti-joint ki deklanche limyè fabrike pa ekriti lazè femtosecond de-an-yon" nan Nature Communications.
Estrateji pwosesis femtosecond lazè de-an-yon sèl la gen ladan itilizasyon polymérisation asimetri de foton pou konstwi jwenti idrogel ak depo rediksyon lazè nan nanopartikul ajan (Ag NPs) nan rejyon lokalize jwenti yo. Nan ka sa a, fotopolymérisation asimetrik kreye anisotropi nan dansite crosslink nan rejyon lokal la nan mikwo-jwenti idwojèl la, ki finalman pèmèt pou deformation koube direksyon ak angilè kontwole. In situ lazè rediksyon depo pèmèt pwosesis egzak nan nanopartikul ajan sou jwenti idwojèl, ki gen yon efè konvèsyon fototèmik fò, ki pèmèt chanjman nan mòd nan micromachines milti-jwenti yo montre karakteristik ekselan nan tan repons ultra-kout (30 ms) ak ultra-ba. kondwi pouvwa (<10 mW).
Kòm yon egzanp tipik, uit mikwo jwenti yo te entegre sou yon mikromachin umanoid. Imedyatman, yo itilize yon teknik modulasyon limyè espasyal pou reyalize yon gwo bout bwa miltifokal nan espas 3D, ki an vire jisteman stimul chak microjoint. Deformation sinèrjetik ant jwenti miltip kondwi mikromachin umanoid pou akonpli plizyè mòd deformation reconfigurable. Alafen, yon "mikworobo danse" reyalize nan echèl mikromèt la.
Finalman, kòm yon prèv-de-konsèp, pa desine distribisyon an ak direksyon deformation nan mikwo-jwenti yo, mikromanipulateur a de-jwenn ka kolekte miltip mikwo-patikil nan tou de direksyon izotwòp ak anisotropik. An konklizyon, femtosecond lazè de-an-yon pwosesis estrateji ka konstwi deformable mikwo-jwenti nan rejyon lokal yo nan divès kalite mikrostruktur 3D ak reyalize plizyè mòd deformation reconfigurable. Nan tan kap vini an, mikromanipulateur ak mòd deformation miltip pral montre kandida aplikasyon laj nan koleksyon mikwo-goods, manipilasyon mikrofluidik, ak manipilasyon selil.
