Thickness-dependent mechanical properties of polydimethylsiloxane membranes

Liu, Miao; Sun, Jingjiang; Sun, Ying; Bock, C.; Chen, Quanfang

doi:10.1088/0960-1317/19/3/035028

Cited by 311 publications

(218 citation statements)

References 17 publications

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“…As a result, determining the linear elastic properties (i.e., Young's modulus and Poisson ratio) of the PDMS top wall for our three data sets was challenging. In particular, several studies [40,38,39] have shown that the Young's modulus E and Poisson ratio ν s of PDMS strongly depend on the method of fabrication and parameters such as the curing temperature, the specimen thickness and the mixing ratio of the components of the polymeric solution. This dependence, in turn, can result in a typical variation of E = 1 to 3 MPa and ν s = 0.4 to 0.5.…”

Section: Materials Propertiesmentioning

confidence: 99%

“…For the present analysis, the variation in the Poisson ratio has been neglected and PDMS has been modelled as a nearly incompressible solid (ν s = 0.499). Raj and Sen [13] have used a value of E = 1.362 MPa, based on experimental results from [39], for their theoretical calculations. However, knowing the sensitivity of the Young's modulus to curing conditions, we made an attempt to find the particular curing conditions under which Liu et al [39] have reported their measurements.…”

Section: Materials Propertiesmentioning

confidence: 99%

“…Raj and Sen [13] have used a value of E = 1.362 MPa, based on experimental results from [39], for their theoretical calculations. However, knowing the sensitivity of the Young's modulus to curing conditions, we made an attempt to find the particular curing conditions under which Liu et al [39] have reported their measurements. From the corresponding thesis [42], we found the specific curing temperature and duration to be 80 • C and 1.5 hours, respectively.…”

Section: Materials Propertiesmentioning

confidence: 99%

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Static response of deformable microchannels: a comparative modelling study

Shidhore

Christov

2018

J. Phys.: Condens. Matter

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Abstract. We present a comparative modelling study of fluid-structure interactions in microchannels. Through a mathematical analysis based on plate theory and the lubrication approximation for low-Reynolds-number flow, we derive models for the flow rate-pressure drop relation for long shallow microchannels with both thin and thick deformable top walls. These relations are tested against full three-dimensional two-way-coupled fluid-structure interaction simulations. Three types of microchannels, representing different elasticity regimes and having been experimentally characterized previously, are chosen as benchmarks for our theory and simulations. Good agreement is found in most cases for the predicted, simulated and measured flow rate-pressure drop relationships. The numerical simulations performed allow us to also carefully examine the deformation profile of the top wall of the microchannel in any cross section, showing good agreement with the theory. Specifically, the prediction that span-wise displacement in a long shallow microchannel decouples from the flow-wise deformation is confirmed, and the predicted scaling of the maximum displacement with the hydrodynamic pressure and the various material and geometric parameters is validated.

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Section: Materials Propertiesmentioning

confidence: 99%

Section: Materials Propertiesmentioning

confidence: 99%

Section: Materials Propertiesmentioning

confidence: 99%

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Static response of deformable microchannels: a comparative modelling study

Shidhore

Christov

2018

J. Phys.: Condens. Matter

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“…5(c)) and we find R = 0.8 mm. For PDMS ν = 0.5; the Young modulus depends on the thickness of the membrane and for 30µm it is about E = 1.4MPa 37 . For these values one finds a = 5.8 µm and P b = 6 kPa.…”

Section: B Cyclic Actuation Below the Explosion Thresholdmentioning

confidence: 99%

Electrochemical membrane microactuator with a millisecond response time

Uvarov

Lokhanin

Постников

et al. 2018

Sensors and Actuators B: Chemical

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Lack of fast and strong actuators to drive microsystems is well recognized. Electrochemical actuators are considered attractive for many applications but they have long response time (minutes) due to slow gas termination. Here an electrochemical actuator is presented for which the response time can be as short as 1ms. The alternating polarity water electrolysis is used to drive the device. In this process only nanobubbles are formed. The gas in nanobubbles can be terminated fast due to surface assisted reaction between hydrogen and oxygen that happens at room temperature. The working chamber of the actuator contains concentric titanium electrodes; it has a diameter of 500 µm and a height of 8 µm. The chamber is sealed by a polydimethylsiloxane (PDMS) membrane of 30µm thick. The device is characterized by an interferometer and a fast camera. Cyclic operation at frequency up to 667 Hz with a stroke of about 30% of the chamber volume is demonstrated. The cycles repeat themselves with high precision providing the volume strokes in picoliter range. Controlled explosions in the chamber can push the membrane up to 90 µm.

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“…By comparison, PDMS has a tensile Young's modulus in the range of 1.32-2.97 MPa, slightly higher than that of skin [33][34][35]. It is proved that compatible component can endow the polymer blend improved mechanical properties [36].…”

Section: Resultsmentioning

confidence: 96%