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A Zero-Power High Throughput Micro Nanoparticle Printing Via Gravity-Surface Tension Mediated Formation Of Picoliter-Scale Droplets

Current approaches to print micro and nanoparticles are promising but have serious limitations to commercial applications. These methods require high power consumption and have complicated and costly set-up. These systems are low-throughput have limited pattern size and resolution-tunability and difficult alignment. In response to these challenges investigators at University of California at Berkeley have developed zero-power nanoparticle printing system. This system uses gravity and surface tension to generate and print picoliter-scale droplets for high-throughput size-tunable printing of micro nanoparticle assemblies. High-throughput picoliter-scale droplets are printed by a single step contact-transferring of the droplets through microporous nanomembrane of a printing head. Rapid evaporative self-assembly of the particles on a hydrophobic surface leads to printing a large array of various microparticles and nanoparticles assemblies of tunable sizes and resolutions. With this technology continuous printing of single type particles and multiplex printing of various types of particles with accurate alignment are successfully performed. As a demonstration of this innovation the investigators have produced size-tunable uniform large arrays of gold nanoparticle assemblies for Surface Enhanced Raman Spectroscopy (SERS) are created. Strong and uniform (


1) high-throughput low power 2) size-tunable 3) single step printing 4)

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