Adaptive liquid microlenses activated by stimuli-responsive hydrogels

Article Abstract:

A tunable liquid lens system that allows for autonomous focusing is demonstrated, wherein a stimuli-responsive hydrogel integrated into a microfluidic system and serving as the container for a liquid droplet is the central component, with the hydrogel simultaneously sensing the presence of stimuli and actuating adjustments to the shape and thereby, focal length of the droplet. The elimination of complex external control systems and easy integration with existing electronic and opto-electronic systems make these microlenses an attractive option in diagnostic and lab-on-a-chip applications.

United States, Optoelectronics, Lenses, Lenses (Optics), Conditioned response, Conditioned responses

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Controlled microfluidic interfaces

Article Abstract:

The microfabrication technologies of the semiconductor industry have made it possible to integrate increasingly complex electronic and mechanical functions, providing ever smaller, cheaper and smarter sensors and devices. These technologies have also spawned microfluidics systems for containing and controlling fluid at the micrometer scale, where the increasing importance viscosity and surface tension profoundly affects fluid behavior.

Fluid dynamics, Surface chemistry, Surface tension

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Functional hydrogel structures for autonomous flow control inside microfluidic channels

Article Abstract:

The processes needed to construct complex microfluidic systems can be significantly simplified by the ability to produce functional structures within microfluidic channels. It has been possible to use direct photopatterning of a liquid phase to fabricate active hydrogel components inside microchannels.

Colloids

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