A low-voltage nano-porous electroosmotic pump

Ai, Ye; Yalcin, Sinan E.; Gu, Dongdong; Baysal, Oktay; Baumgart, Helmut; Qian, Shizhi; Beşkök, Ali

doi:10.1016/j.jcis.2010.07.024

Cited by 56 publications

(44 citation statements)

References 51 publications

(60 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This results in an uncorrected (α = 1) eo = (1.8 ± 0.1) 10 − 10 m 2 V −1 s −1 for 1 mM NaCl at pH = 5.7 ± 0.1. The Debye length for 1 mM NaCl is approximately 9.6 nm, resulting in a correction factor α = 0.9 (Ai et al 2010;Zeng et al 2001), and a corrected eo = (2.0 ± 0.1) 10 −10 m 2 V −1 s −1 . The zeta potential ζ, estimated from this electroosmotic mobility is as follows:…”

Section: Resultsmentioning

confidence: 99%

“…Traditionally, most EOPs have been constructed with beds of packed silica particles (Zeng et al 2001) or relatively rigid porous materials such as anodic aluminum oxide (Ai et al 2010;Miao et al 2007). Polymeric, porous membranes function well as this media in flexible low-voltage EOPs since they are relatively thin, mechanically flexible, and can be highly porous.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A large-area, all-plastic, flexible electroosmotic pump

Bengtsson

Robinson

2017

Microfluid Nanofluid

View full text Add to dashboard Cite

A large-area, fabric-like pump would potentially have applications, for example, in controlling water transport through a garment, such as a rain jacket, regardless of the external temperature and humidity. This paper presents an all-plastic, flexible electroosmotic pump, constructed from commercially available materials: A polycarbonate membrane combined with the electrochemically active polymer poly(3,4-ethylenedioxythiophene) polystyrene sulfonate that actively transports water using an electric potential that can be supplied by a small battery. By using electrochemically active polymer electrodes instead of metal electrodes, the electrochemical reaction that drives flow avoids the oxygen and hydrogen gas production or pH changes associated with water electrolysis. We observe a water mass flux up to 23 mg min −1 per cm 2 polycarbonate membrane (porosity 10-15%), at an applied potential of 5 V, and a limiting operating pressure of 0.3 kPa V −1 , similar to previously reported membrane-based electroosmotic pumps.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A large-area, all-plastic, flexible electroosmotic pump

Bengtsson

Robinson

2017

Microfluid Nanofluid

View full text Add to dashboard Cite

show abstract

“…For these reasons, the development of a low-voltage EOP is a current focus in the literature. Several recent low-voltage EOPs have been fabricated from porous silicon (10), alumina (11)(12)(13), track-etched polymer (14), and carbon nanotube membranes (15). These low-voltage EOPs are much thinner than their highvoltage predecessors (60-350 μm compared with >10 mm).…”

mentioning

confidence: 99%

High-performance, low-voltage electroosmotic pumps with molecularly thin silicon nanomembranes

Snyder

Getpreecharsawas

Fang

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

We have developed electroosmotic pumps (EOPs) fabricated from 15-nm-thick porous nanocrystalline silicon (pnc-Si) membranes. Ultrathin pnc-Si membranes enable high electroosmotic flow per unit voltage. We demonstrate that electroosmosis theory compares well with the observed pnc-Si flow rates. We attribute the high flow rates to high electrical fields present across the 15-nm span of the membrane. Surface modifications, such as plasma oxidation or silanization, can influence the electroosmotic flow rates through pnc-Si membranes by alteration of the zeta potential of the material. A prototype EOP that uses pnc-Si membranes and Ag/ AgCl electrodes was shown to pump microliter per minute-range flow through a 0.5-mm-diameter capillary tubing with as low as 250 mV of applied voltage. This silicon-based platform enables straightforward integration of low-voltage, on-chip EOPs into portable microfluidic devices with low back pressures.lectroosmotic flow results from the interaction between an electric field and the diffuse layer of ions at a charged surface. In capillaries or pores, the migration of the diffuse layer toward the oppositely charged electrode causes the bulk fluid within the channel to flow through viscous drag. Electroosmotic pumps (EOPs) are designed to generate high flow rates in microchannels using these principles (1, 2). EOPs present a number of advantages over mechanical pumps, including the lack of mechanical parts, pulse-free flows, and ease of control through electrode actuation. EOPs have been suggested as pumps for cooling circuits (3) and microfluidic devices that aid in drug delivery (4, 5) or diagnostics (2, 6). Microfluidic devices enable the miniaturization of multistep laboratory processes into small, low-cost, disposable units (6, 7). The inclusion of multiple steps into a single device increases the need for the precision pumping of fluids on-chip.High voltages (>1 kV) are often required for direct current (dc) EOPs to achieve sufficient flow rates in microchannels (8, 9). However, devices with high-voltage EOPs require bulky external power supplies and a skilled technician to operate, which defeats the ease of use and portability aims of a microfluidic diagnostic tool. For these reasons, the development of a low-voltage EOP is a current focus in the literature. Several recent low-voltage EOPs have been fabricated from porous silicon (10), alumina (11-13), track-etched polymer (14), and carbon nanotube membranes (15). These low-voltage EOPs are much thinner than their highvoltage predecessors (60-350 μm compared with >10 mm). Yao et al. suggest that further thinning of EOPs will enable better voltage-specific characteristics (16). Here, we examine the electroosmotic pumping by nanoporous membranes that are more than two orders of magnitude thinner than any membrane material previously used in an EOP.We have recently developed an ultrathin (15-30 nm), nanoporous membrane material called porous nanocrystalline silicon (pnc-Si) (17). pnc-Si membranes are fabricated on silicon wafers usin...

show abstract

“…Packed porous media EOF pumps [29][30][31][32], highly miniaturized and integrated microfluidic pumps, can drive high-pressure or flow-rate fluids. Similar to the porous membrane EOF pumps, the packed porous media EOF pumps have a large number of sub-micro-or nanopump channels inside.…”

Section: Packed Porous Media Electroosmotic Flow (Eof) Pumpmentioning

confidence: 99%

“…The open capillary has the ability to deliver a wide range of sample reagents such as pure liquid drug reagents and aqueous solutions containing cells, particles, or biochemical macromolecules. The porous media EOF pumps [25][26][27][28][29][30][31][32] can also be used to drive pure liquid sample reagents for the injection purpose. For on-chip microfluidic delivery, open-channel EOF pumps [20][21][22][23][24] are the most popular pumping devices.…”

Section: Microfluidic Delivery and Actuationmentioning

confidence: 99%

Electroosmotic Flow Pump

Gao¹,

Gui²

2016

Advances in Microfluidics - New Applications in Biology, Energy, and Materials Sciences

View full text Add to dashboard Cite

Electroosmotic flow (EOF) pumping has been widely used to manipulate fluids such as liquid sample reagents in microfluidic systems. In this chapter, we will introduce the research progress on EOF pumps in the fields of microfluidic science and technology and briefly present their microfluidic applications in recent years. The chapter focuses on pump channel materials, electrodes, and their fabrication techniques in microfluidics.

show abstract

A low-voltage nano-porous electroosmotic pump

Cited by 56 publications

References 51 publications

A large-area, all-plastic, flexible electroosmotic pump

A large-area, all-plastic, flexible electroosmotic pump

High-performance, low-voltage electroosmotic pumps with molecularly thin silicon nanomembranes

Electroosmotic Flow Pump

Contact Info

Product

Resources

About