Next Article in Journal
Nonlinear Dynamic Modeling of Langevin-Type Piezoelectric Transducers
Next Article in Special Issue
Role of α and β Transmembrane Domains in Integrin Clustering
Previous Article in Journal
Design and Characterization of a High-Precision Digital Electromagnetic Actuator with Four Discrete Positions
Article Menu

Export Article

Open AccessArticle
Actuators 2015, 4(4), 237-254; doi:10.3390/act4040237

Ionic Polymer Microactuator Activated by Photoresponsive Organic Proton Pumps

1
Department of Mechanical Engineering, Abu Dhabi University, Abu Dhabi, United Arab Emirates
2
Department of Mechanical and Materials Engineering, the University of Western Ontario, London, Ontario N6A 5B9, Canada
3
Department of Chemical and Biochemical Engineering, the University of Western Ontario, London, Ontario N6A 5B9, Canada
*
Author to whom correspondence should be addressed.
Academic Editor: Ebrahim Ghafar-Zadeh
Received: 27 August 2015 / Revised: 16 October 2015 / Accepted: 21 October 2015 / Published: 26 October 2015
(This article belongs to the Special Issue Biophysical Micro- and Nano-Actuators)
View Full-Text   |   Download PDF [1123 KB, uploaded 26 October 2015]   |  

Abstract

An ionic polymer microactuator driven by an organic photoelectric proton pump transducer is described in this paper. The light responsive transducer is fabricated by using molecular self-assembly to immobilize oriented bacteriorhodopsin purple membrane (PM) patches on a bio-functionalized porous anodic alumina (PAA) substrate. When exposed to visible light, the PM proton pumps produce a unidirectional flow of ions through the structure’s nano-pores and alter the pH of the working solution in a microfluidic device. The change in pH is sufficient to generate an osmotic pressure difference across a hydroxyethyl methacrylate-acrylic acid (HEMA-AA) actuator shell and induce volume expansion or contraction. Experiments show that the transducer can generate an ionic gradient of 2.5 μM and ionic potential of 25 mV, producing a pH increase of 0.42 in the working solution. The ΔpH is sufficient to increase the volume of the HEMA-AA microactuator by 80%. The volumetric transformation of the hydrogel can be used as a valve to close a fluid transport micro-channel or apply minute force to a mechanically flexible microcantilever beam. View Full-Text
Keywords: microfluidics; lab-on-chip; bacteriorhodopsin; proton pumps; molecular self-assembly; micro-actuation; pH-sensitive hydrogels microfluidics; lab-on-chip; bacteriorhodopsin; proton pumps; molecular self-assembly; micro-actuation; pH-sensitive hydrogels
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Al-Aribe, K.M.; Knopf, G.K.; Bassi, A.S. Ionic Polymer Microactuator Activated by Photoresponsive Organic Proton Pumps. Actuators 2015, 4, 237-254.

Show more citation formats Show less citations formats

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Actuators EISSN 2076-0825 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top