Micro-cylindrical temperature sensors are crucial components for in-situ physiological signal monitoring in smart healthcare and minimally invasive surgical systems.However,due to the high-curvature complexity of the ...Micro-cylindrical temperature sensors are crucial components for in-situ physiological signal monitoring in smart healthcare and minimally invasive surgical systems.However,due to the high-curvature complexity of the substrates,highprecision microfabrication on micro-cylindrical surfaces still faces significant challenges.This study proposes a microcylindrical electrohydrodynamic printing process to achieve on-demand high-resolution patterning on high-curvature surfaces with diameters ranging from 55μm to 10 mm,addressing issues of mapping errors and stress concentration in array sensors integrated on micro-cylindrical surfaces.A physical model of micro-cylindrical electrohydrodynamic printing is established based on two-phase flow electrohydrodynamics to analyze the factors affecting the formation of stable cone-jets and the deposition of ink droplets on curved surfaces.Considering the elongated and high-curvature characteristics of micro-cylindrical objects,a printing system is designed with four degrees of freedom,coupling object rotation and translation.Numerical simulations reveal the patterns of electric field distortion caused by the horizontal offset of the nozzle relative to the vertical symmetry axis of the object,while experimental results identify the printing windows for inks of varying viscosities,voltages,and printing heights.Finally,a temperature sensor array is fabricated on the micro-cylindrical surface(sensor line width~150μm,lead wire width less than 50μm,sensitivity~0.00106),validating the consistency and stability of the array sensors and enabling temperature measurements in the range of 20℃‒100℃.Additionally,the capability of the sensors array for temperature monitoring in simulated narrow cavity heating environments is demonstrated,exploring a novel method for fabricating advanced minimally invasive surgical instruments.展开更多
基金supported by the National Key Research and Development Program of China(Grant No.2021YFB3200700)the National Natural Science Foundation of China(Grant Nos.U23A20111,52175536,52188102).
文摘Micro-cylindrical temperature sensors are crucial components for in-situ physiological signal monitoring in smart healthcare and minimally invasive surgical systems.However,due to the high-curvature complexity of the substrates,highprecision microfabrication on micro-cylindrical surfaces still faces significant challenges.This study proposes a microcylindrical electrohydrodynamic printing process to achieve on-demand high-resolution patterning on high-curvature surfaces with diameters ranging from 55μm to 10 mm,addressing issues of mapping errors and stress concentration in array sensors integrated on micro-cylindrical surfaces.A physical model of micro-cylindrical electrohydrodynamic printing is established based on two-phase flow electrohydrodynamics to analyze the factors affecting the formation of stable cone-jets and the deposition of ink droplets on curved surfaces.Considering the elongated and high-curvature characteristics of micro-cylindrical objects,a printing system is designed with four degrees of freedom,coupling object rotation and translation.Numerical simulations reveal the patterns of electric field distortion caused by the horizontal offset of the nozzle relative to the vertical symmetry axis of the object,while experimental results identify the printing windows for inks of varying viscosities,voltages,and printing heights.Finally,a temperature sensor array is fabricated on the micro-cylindrical surface(sensor line width~150μm,lead wire width less than 50μm,sensitivity~0.00106),validating the consistency and stability of the array sensors and enabling temperature measurements in the range of 20℃‒100℃.Additionally,the capability of the sensors array for temperature monitoring in simulated narrow cavity heating environments is demonstrated,exploring a novel method for fabricating advanced minimally invasive surgical instruments.
