Latchable microfluidic valve arrays based on shape memory polymer actuators

Aksoy, Bekir; Besse, Nadine; Boom, Robert Jan; Hoogenberg, Bas-Jan; Blom, M.T.; Shea, Herbert

doi:10.1039/c8lc01024b

Cited by 21 publications

(23 citation statements)

References 37 publications

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“…In this work, we report a highly sensitive, simple to fabricate and low-cost resonant IR sensor based on the strong temperature dependence of the Young's modulus of thermoresponsive Shape Memory Polymers (SMPs) [30][31][32] . SMPs are programmable phase-change materials that can memorize a permanent shape, be deformed and fixed in a temporary shape under given conditions, and later, upon external command, relax to their original permanent shape [33][34][35][36][37][38] . We present the first use of the phase transition as a transduction mechanism for IR detection.…”

Section: 𝑇𝐶𝐹mentioning

confidence: 99%

Shape memory polymer resonators as highly sensitive uncooled infrared detectors

et al. 2019

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Uncooled infrared detectors have enabled the rapid growth of thermal imaging applications. These detectors are predominantly bolometers, reading out a pixel’s temperature change due to infrared radiation as a resistance change. Another uncooled sensing method is to transduce the infrared radiation into the frequency shift of a mechanical resonator. We present here highly sensitive resonant infrared sensors, based on thermo-responsive shape memory polymers. By exploiting the phase-change polymer as transduction mechanism, our approach provides 2 orders of magnitude improvement of the temperature coefficient of frequency. Noise equivalent temperature difference of 22 mK in vacuum and 112 mK in air are obtained using f/2 optics. The noise equivalent temperature difference is further improved to 6 mK in vacuum by using high-Q silicon nitride membranes as substrates for the shape memory polymers. This high performance in air eliminates the need for vacuum packaging, paving a path towards flexible non-hermetically sealed infrared sensors.

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Section: 𝑇𝐶𝐹mentioning

confidence: 99%

Shape memory polymer resonators as highly sensitive uncooled infrared detectors

et al. 2019

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“…[ 1–14 ] Due to shape memory effects, SMPs have been greatly developed in the fields of aerospace, biomedicine, textile, microfluidics, and information carriers. [ 15–27 ]…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14] Due to shape memory effects, SMPs have been greatly developed in the fields of aerospace, biomedicine, textile, microfluidics, and information carriers. [15][16][17][18][19][20][21][22][23][24][25][26][27] after deformation, SMP micro/nanopatterns allow for the transformation between initial and temporary shapes. Third, compared to ordinary surfaces prepared based on PDMS, SMP surfaces can be fabricated from a variety of materials, and the availability of materials is extended.…”

Section: Introductionmentioning

confidence: 99%

Application and Development of Shape Memory Micro/Nano Patterns

Liu

Chen

et al. 2021

Small

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Shape memory polymers (SMPs) are a class of smart materials that change shape when stimulated by environmental stimuli. Different from the shape memory effect at the macro level, the introduction of micro‐patterning technology into SMPs strengthens the exploration of the shape memory effect at the micro/nano level. The emergence of shape memory micro/nano patterns provides a new direction for the future development of smart polymers, and their applications in the fields of biomedicine/textile/micro‐optics/adhesives show huge potential. In this review, the authors introduce the types of shape memory micro/nano patterns, summarize the preparation methods, then explore the imminent and potential applications in various fields. In the end, their shortcomings and future development direction are also proposed.

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“…Generally speaking, microfluidic actuation methods include mechanical and non-mechanical modes, and the latter has the advantages of simple architecture due to no moving parts, ease of miniaturization and integration, flexible driving method, high reliability, and long service life [7,8,9]. As a result, unlike MEMS, the non-mechanical actuation mode has become popular in microfluidic systems [10,11,12,13,14].…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of a Microfluidic Pump Based on Combined Actuation of the Piezoelectric Effect and Liquid Crystal Backflow Effect

Guan

2019

Micromachines

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A novel combined actuation method based on the piezoelectric effect and liquid crystal backflow effect is proposed in this paper. The coupling mechanism of a piezoelectric transducer (PZT) and liquid crystal (LC) in a combined driving mode is analyzed, and the governing equations of electromechanical coupling based on inverse piezoelectric effect and the classical Leslie–Ericksen backflow equation are modified under combined driving method. The new multifield coupling dynamic equations for numerical analysis is established. Experimentally, a sandwiched micropump was manufactured and sealed with wet etching technology on a glass wafer. A testing platform was built to analyze the particles motion and the flow rates were measured with both single PZT or LC actuation and combined actuation. Comparing the results of the numerical analysis and experimental testing of the flow rate and LC molecule motion under different driving voltages and frequencies, the performance of the PZT/LC combined driving is found to be superior to that of the single driving mode (PZT or LC driving) under the same driving conditions. Moreover, the new combined driving mode overcome the disadvantages of single driving mode and enhance the driving efficiency significantly. The simulation results are in good agreement with the experimental data. The maximum flow rate of the micropump achieved was 4.494 μL/min with combined driving method.

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Latchable microfluidic valve arrays based on shape memory polymer actuators

Cited by 21 publications

References 37 publications

Shape memory polymer resonators as highly sensitive uncooled infrared detectors

Shape memory polymer resonators as highly sensitive uncooled infrared detectors

Application and Development of Shape Memory Micro/Nano Patterns

Performance Analysis of a Microfluidic Pump Based on Combined Actuation of the Piezoelectric Effect and Liquid Crystal Backflow Effect

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