Micro Valve and Chaotic Mixer Driven by Electrorheological Fluid

Niu, Xize; Lee, Yi-Kuen; Liu, Liyu; Wen, Weijia

doi:10.1109/nems.2006.334710

Cited by 2 publications

(2 citation statements)

References 5 publications

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“…Sheng et al have performed studies on using ERFs as valves [19], and others have used the ERF as a micro-valve [20,21], confirming the pressure drop properties discussed in Section 2.1. Note that these studies have only confirmed the basic functionality of using an ERF as a valve, and there is still a lack of empirical study in the literature that utilizes the ERF valve as part of an overall system in which nonlinear effects, such as particle distribution temperature and ERF particle purity, can play a big role in the performance of an ERF valve and are only observable through experimentation.…”

Section: Introductionmentioning

confidence: 57%

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Characterization and Testing of an Electrorheological Fluid Valve for Control of ERF Actuators

Nguyen¹,

Jorgensen

Ho³

et al. 2015

Actuators

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Previous studies of electrorheological fluids (ERFs) were motivated by brake, clutch, damping, haptic and resistive applications, but never motivated towards developing an ERF based-hydraulic rotary actuator. One design to make such an actuator is to use ERF-based valves. To fully understand the performance of such an actuator, it is imperative to study ERF valves. For this reason, this paper presents a summary of design considerations for creating ERF-based actuators, an ERF-based valve design for an ERF actuator and a new experimental test-bed to obtain viscosity and yield characteristics of the ERF at flow rates as low as 0.049 L/min, an order of magnitude lower than industrial rheometers. The new test-bed successfully measured the dynamic viscosity of the ERF to be at 0.6 Pa-s for low flow rates and 0.2 Pa-s for higher flow rates. The presented valve design can successfully resist 1 MPa of fluid pressure, which is an operation mode higher than any haptic and damping applications in the literature. The experiments also shows that higher flow rates negatively affect the ERF's yield characteristics for the first time in a situation where the ERF valve completely blocks flow. When the flow rates are increased, the response time to a fully-closed valve increases, the effective yield capability of the ERF decreases and the conductivity of the ERF increases.

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Section: Introductionmentioning

confidence: 57%

“…However, a disadvantage is that the switching rate depends on how fast the ERF can actually form the chains. Preliminary research has claimed that it can have a switching rate of at least 100 Hz, but a higher rate might be necessary for particle actuator applications [20,31]. Figure 4.…”

Section: Proposed Erf Actuator Architecturementioning

confidence: 99%

Characterization and Testing of an Electrorheological Fluid Valve for Control of ERF Actuators

Nguyen¹,

Jorgensen

Ho³

et al. 2015

Actuators

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PMMA/PDMS valves and pumps for disposable microfluidics

et al. 2009

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Poly(methyl methacrylate) (PMMA) is gaining in popularity in microfluidic devices because of its low cost, excellent optical transparency, attractive mechanical/chemical properties, and simple fabrication procedures. It has been used to fabricate micromixers, PCR reactors, CE and many other microdevices. Here we present the design, fabrication, characterization and application of pneumatic microvalves and micropumps based on PMMA. Valves and pumps are fabricated by sandwiching a PDMS membrane between PMMA fluidic channel and manifold wafers. Valve closing or opening can be controlled by adjusting the pressure in a displacement chamber on the pneumatic layer via a computer regulated solenoid. The valve provides up to 15.4 microL s(-1) at 60 kPa fluid pressure and seals reliably against forward fluid pressure as high as 60 kPa. A PMMA diaphragm pump can be assembled by simply connecting three valves in series. By varying valve volume or opening time, pumping rates ranging from nL to microL per second can be accurately achieved. The PMMA based valves and pumps were further tested in a disposable automatic nucleic acid extraction microchip to extract DNA from human whole blood. The DNA extraction efficiency was about 25% and the 260 nm/280 nm UV absorption ratio for extracted DNA was 1.72. Because of its advantages of inexpensive, facile fabrication, robust and easy integration, the PMMA valve and pump will find their wide application for fluidic manipulation in portable and disposable microfluidic devices.

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Micro Valve and Chaotic Mixer Driven by Electrorheological Fluid

Cited by 2 publications

References 5 publications

Characterization and Testing of an Electrorheological Fluid Valve for Control of ERF Actuators

Characterization and Testing of an Electrorheological Fluid Valve for Control of ERF Actuators

PMMA/PDMS valves and pumps for disposable microfluidics

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