Logic control of microfluidics with smart colloid

Type
Article

Authors
Wang, Limu
Zhang, Mengying
Li, Jiaxing
Gong, Xiuqing
Wen, Weijia

KAUST Grant Number
SA-C0040
UK-C0016

Date
2010

Abstract
We report the successful realization of a microfluidic chip with switching and corresponding inverting functionalities. The chips are identical logic control components incorporating a type of smart colloid, giant electrorheological fluid (GERF), which possesses reversible characteristics via a liquid-solid phase transition under external electric field. Two pairs of electrodes embedded on the sides of two microfluidic channels serve as signal input and output, respectively. One, located in the GERF micro-channel is used to control the flow status of GERF, while another one in the ither micro-fluidic channel is used to detect the signal generated with a passing-by droplet (defined as a signal droplet). Switching of the GERF from the suspended state (off-state) to the flowing state (on-state) or vice versa in the micro-channel is controlled by the appearance of signal droplets whenever they pass through the detection electrode. The output on-off signals can be easily demonstrated, clearly matching with GERF flow status. Our results show that such a logic switch is also a logic IF gate, while its inverter functions as a NOT gate. © The Royal Society of Chemistry 2010.

Citation
Wang L, Zhang M, Li J, Gong X, Wen W (2010) Logic control of microfluidics with smart colloid. Lab Chip 10: 2869. Available: http://dx.doi.org/10.1039/c0lc00003e.

Acknowledgements
This publication is based on work partially supported by Award No. SA-C0040/UK-C0016, made by King Abdullah University of Science and Technology (KAUST), Hong Kong RGC grants HKUST 603608, and the Nanoscience and Nanotechnology Program at HKUST. Useful discussion with Casey Glick is acknowledged.

Publisher
Royal Society of Chemistry (RSC)

Journal
Lab on a Chip

DOI
10.1039/c0lc00003e

PubMed ID
20882229

Permanent link to this record