Acoustic Trapping: An Emerging Tool for Microfabrication Technology

Abstract

Figure 11. Schematic representation of the potential application of the immobilized microscale objects by acoustic patterning technology.

Review of Droplet Printing Technologies for Flexible Electronic Devices: Materials, Control, and Applications

“…The unusual electric-field distribution generated by crosstalk between adjacent dispenser holes can be used to intricately control the microjet path of the ink, thereby enabling on-demand control of shape, position, and material composition in the 3D printing of nanostructures. Compared to traditional serial methods, this parallel method significantly improves productivity while achieving nanoscale printing of multiple materials, as shown in Figure 4 b. Chai [ 60 ] introduced a method for capturing and manipulating small objects using sound waves generated by piezoelectric materials. Piezoelectric actuators produce sound waves at different frequencies under varying voltages, such that control over the frequency and amplitude of the sound waves can be used to successfully capture and manipulate small droplets of varying sizes and shapes.…”

“…Piezoelectric actuators produce sound waves at different frequencies under varying voltages, such that control over the frequency and amplitude of the sound waves can be used to successfully capture and manipulate small droplets of varying sizes and shapes. Chai [ 60 , 61 ] utilized the interaction between a magnetic field generated by an electromagnetic coil and sound waves to capture small objects, designing an electromagnetic-driven acoustic capture device that, by altering the coil’s current and frequency, achieves capture and manipulation of small objects. This method boasts high capture efficiency and precision, as shown in Figure 4 c.…”

“…( c ) Schematic diagram of droplet printing by magnetic and acoustic field control. Reproduced with permission from [ 60 ], published by John Wiley and Sons, 2023.…”

“…Compared to traditional serial methods, this parallel method significantly improves productivity while achieving nanoscale printing of multiple materials, as shown in Figure 4b. Chai [60] introduced a method for capturing and manipulating small objects using sound waves generated by piezoelectric materials. Piezoelectric actuators produce sound waves at different frequencies under varying voltages, such that control over the frequency and amplitude of the sound waves can be used to successfully capture and manipulate small droplets of varying sizes and shapes.…”

MEMS nozzle for dry-capturing lily pollens in array and fixing on culture media for plasma bio-applications

“…To meet the increasing requirements of different research purposes, strategies with more diversified functions and delicate structures were proposed to achieve diverse microarray targets. Micro acoustofluidic systems were presented to dynamically realize the patterning of micro/nano samples based on acoustic waves, [30][31][32][33][34] but the patterned samples were difficult to quantify, and the acoustic energy loss on the microfluidic chip was difficult to avoid. Many strategies were proposed to achieve various microarrays based on magnetic [35][36][37] and dielectrophoresis, 38,39) but they were unsuitable for biosamples sensitive to magnetic or electric field.…”