NDLI: A light writable microfluidic “flash memory”: Optically addressed actuator array with latched operation for microfluidic applications

Content Provider	Royal Society of Chemistry (RSC)
Author	Pal, Rohit Gulari, Erdogan Hua, Zhishan Burns, Mark A. Srivannavit, Onnop
Copyright Year	2008
Abstract	This paper presents a novel optically addressed microactuator array (microfluidic “flash memory”) with latched operation. Analogous to the address-data bus mediated memory address protocol in electronics, the microactuator array consists of individual phase-change based actuators addressed by localized heating through focused light patterns (address bus), which can be provided by a modified projector or high power laser pointer. A common pressure manifold (data bus) for the entire array is used to generate large deflections of the phase change actuators in the molten phase. The use of phase change material as the working media enables latched operation of the actuator array. After the initial light “writing” during which the phase is temporarily changed to molten, the actuated status is self-maintained by the solid phase of the actuator without power and pressure inputs. The microfluidic flash memory can be re-configured by a new light illumination pattern and common pressure signal. The proposed approach can achieve actuation of arbitrary units in a large-scale array without the need for complex external equipment such as solenoid valves and electrical modules, which leads to significantly simplified system implementation and compact system size. The proposed work therefore provides a flexible, energy-efficient, and low cost multiplexing solution for microfluidic applications based on physical displacements. As an example, the use of the latched microactuator array as “normally closed” or “normally open” microvalves is demonstrated. The phase-change wax is fully encapsulated and thus immune from contamination issues in fluidic environments.
Starting Page	488
Ending Page	491
Page Count	4
File Format	HTM / HTML PDF
ISSN	14730197
Volume Number	8
Issue Number	3
Journal	Lab on a Chip
DOI	10.1039/b712983a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Computer data storage Laser pointer Solenoid Flash memory Inlet manifold Address bus Actuator
Content Type	Text
Resource Type	Article
Subject	Chemistry Nanoscience and Nanotechnology Biochemistry Bioengineering Biomedical Engineering

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