Stress-strain relationship of PDMS micropillar for force measurement application

Johari, Shazlina; Shyan, L. Y.

doi:10.1051/epjconf/201716201080

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…At that point, the force by which the crystal impinges on the pillar has reached its maximum and is counterbalanced by the stiffness of the pillar. The height-to-diameter aspect ratio of the micropillars was maintained above five, such that it was safe to ignore the shear contribution to the total deformation and attribute the entire displacement to bending ( 27 ). By tracking the motion of the displaced pillars, the force exerted by the crystal tip on each pillar can be determined as

where k is the stiffness of the micropillar calculated using a Young’s modulus for PDMS, E PDMS = 2.6 MPa ( 28 ), and δ is the displacement of the pillar’s tip.…”

Section: Resultsmentioning

confidence: 99%

Performance of molecular crystals in conversion of light to mechanical work

Halabi

Ahmed

Sofela

et al. 2021

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

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Dynamic molecular crystals have recently received ample attention as an emerging class of energy-transducing materials, yet have fallen short of developing into fully realized actuators. Through the trans–cis surface isomerization of three crystalline azobenzene materials, here, we set out to extensively characterize the light-to-work energy conversion of photoinduced bending in molecular crystals. We distinguish the azobenzene single crystals from commonly used actuators through quantitative performance evaluation and specific performance indices. Bending molecular crystals have an operating range comparable to that of microactuators such as microelectromechanical systems and a work-generating capacity and dynamic performance that qualifies them to substitute micromotor drivers in mechanical positioning and microgripping tasks. Finite element modeling, applied to determine the surface photoisomerization parameters, allowed for predicting and optimizing the mechanical response of these materials. Utilizing mechanical characterization and numerical simulation tools proves essential in accelerating the introduction of dynamic molecular crystals into soft microrobotics applications.

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where k is the stiffness of the micropillar calculated using a Young’s modulus for PDMS, E PDMS = 2.6 MPa ( 28 ), and δ is the displacement of the pillar’s tip.…”

Section: Resultsmentioning

confidence: 99%

Performance of molecular crystals in conversion of light to mechanical work

Halabi

Ahmed

Sofela

et al. 2021

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

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“…Elastomeric micropillar arrays are frequently used in areas such as biosensors, 1–4 force sensors, 5–7 microfluidic devices, 8,9 superhydrophobic surfaces, 10–12 and liquid-infused surfaces. 13–15 Among them, polydimethylsiloxane (PDMS) based micropillar arrays have received the most attention in favor of their optical transparency, 16 good mechanical resilience, 17 and ease of formation and specific functionalization.…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of organic solvents for recovering collapsed PDMS micropillar arrays

Wang

Tian

2023

RSC Adv.

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“…The authors found that the most accurate model was the Yeoh 3 rd order model for both uniaxial tensile and punch-shear loadings (for low strain region) and the PUA core coated with 100 nm-thick PDMS micropillar showed better lateral strength than pure PDMS micropillar. Johari and Shyan [10] analyzed effect of height and diameter of the cylindrical micropillar which made of PDMS material under shear forces in ANSYS program. The FE results showed that the deformation increases when micropillar height increased and micropillar diameter decreased.…”

Section: Introductionmentioning

confidence: 99%

Compressive Behaviors of Micropillar Sheets Made of PDMS Material Using the Finite Element Method

Pakawan¹,

Puttapitukporn²,

Atthi³

et al. 2020

EngJ

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Thai Microelectronics Center fabricates micropillar sheets from soft lithography techniques and roll-to-roll process which were used as superhydrophobic and superoleophobic surfaces coated on marine structures and medical devices. This research aimed to study appropriate constitutive models and mechanical behaviours of PDMS micropillar sheets with two substrate thicknesses of 1,910 µm and 150 µm under compressive loading using ANSYS Mechanical APDL program. The constitutive models consisted of Mooney-Rivlin (2, 3 and 5 parameters), Ogden (1 st , 2 nd and 3 rd orders), Neo-Hookean, Polynomial (1 st and 2 nd orders), Arruda-Boyce, Gent and Yeoh (1 st , 2 nd and 3 rd orders) models were curved fitting with experiment data from uniaxial compression test. We found that the most accurate constitutive model was Mooney-Rivlin 5 parameter model for the low strain range   ( 0.225) z . The compressive strength and the lateral collapse of micropillars depended on substrate thickness were studied. The lateral collapse of micropillars was found when the substrate thicknesses were 150 µm and 1,910 µm. As the substrate thickness decreased, the compressive strength decreased while the elastic stiffness increased. The maximum compressive forces per one micropillar were 21.060 µN and 18.549 µN for the 1,910 µm and 150 µm thick substrates respectively.

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Stress-strain relationship of PDMS micropillar for force measurement application

Cited by 5 publications

References 9 publications

Performance of molecular crystals in conversion of light to mechanical work

Performance of molecular crystals in conversion of light to mechanical work

Effectiveness of organic solvents for recovering collapsed PDMS micropillar arrays

Compressive Behaviors of Micropillar Sheets Made of PDMS Material Using the Finite Element Method

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