Stick–Slip Friction of PDMS Surfaces for Bioinspired Adhesives

Xue, Longjian; Pham, Jonathan T.; Iturri, Jagoba; Campo, Aránzazu del

doi:10.1021/acs.langmuir.6b00513

Cited by 53 publications

(38 citation statements)

References 37 publications

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“…On the other hand, one can expect the presence of more uncross‐linked PDMS on the surface of soft PDMS than on stiff PDMS resulting from the lower cross‐linking density. These uncross‐linked PDMS could in turn also impact the physicochemical chemical interaction between PDMS and objects . Secondly, soft PDMS may deform upon bacteria/beads adhesion.…”

Section: Resultsmentioning

confidence: 99%

Bacterial Adhesion on Soft Materials: Passive Physicochemical Interactions or Active Bacterial Mechanosensing?

Straub

Bigger

Valentin

et al. 2019

Adv Healthcare Materials

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The influence of mechanical stiffness of biomaterials on bacterial adhesion is only sparsely studied and the mechanism behind this influence remains unclear. Here, bacterial adhesion on polydimethylsiloxane (PDMS) samples, having four different degrees of stiffness with Young's modulus ranging from 0.06 to 4.52 MPa, is investigated. Escherichia coli and Pseudomonas aeruginosa are found to adhere in greater numbers on soft PDMS (7‐ and 27‐fold increase, respectively) than on stiff PDMS, whereas Staphylococcus aureus adheres in similar numbers on the four tested surfaces. To determine whether the observed adhesion behavior is caused by bacteria‐specific mechanisms, abiotic polystyrene (PS) beads are employed as bacteria substitutes. Carboxylate‐modified PS (PS‐COOH) beads exhibit the same adhesion pattern as E. coli and P. aeruginosa with four times more adhered beads on soft PDMS than on stiff PDMS. In contrast, amine‐modified PS (PS‐NH2) beads adhere in similar numbers on all tested samples, reminiscent of S. aureus adhesion. This work demonstrates for the first time that the intrinsic physicochemical properties associated with PDMS substrates of different stiffness strongly influence bacterial adhesion and challenge the previously reported theory on active bacterial mechanosensing, which provides new insights into the design of antifouling surfaces.

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Section: Resultsmentioning

confidence: 99%

Bacterial Adhesion on Soft Materials: Passive Physicochemical Interactions or Active Bacterial Mechanosensing?

Straub

Bigger

Valentin

et al. 2019

Adv Healthcare Materials

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“…29 It should be noted that interfacial slippage might occur at the ice-coating interface due to the effect of unreacted polymeric chains in the elastomer, which is also in favor of the detachment. 11,45 While ice adhesion strength is of great importance for icephobic materials, their durability is also crucial to the outdoor applications. We thus performed cyclic icing and deicing tests on the 7-1 elastomer to evaluate the durability of as-prepared materials.…”

Section: Synthesis Of Py-pdms Ligandmentioning

confidence: 99%

Enhancing the Mechanical Durability of Icephobic Surfaces by Introducing Autonomous Self-Healing Function

Zhuo

Håkonsen

et al. 2018

ACS Appl. Mater. Interfaces

110

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Ice accretion presents a severe risk for human safety. Although great efforts have been made for developing icephobic surfaces (the surface with an ice adhesion strength below 100 kPa), expanding the lifetime of state-of-the-art icephobic surfaces still remains a critical unsolved issue. Herein, a novel icephobic material is designed by integrating an interpenetrating polymer network (IPN) into an autonomous self-healing elastomer, which is applied in anti-icing for enhancing the mechanical durability. The molecular structure, surface morphology, mechanical properties, and durable icephobicity of the material were studied. The creep behaviors of the new icephobic material, which were absent in most relevant studies on self-healing materials, were also investigated in this work. Significantly, the material showed great potentials for anti-icing applications with an ultralow ice adhesion strength of 6.0 ± 0.9 kPa, outperforming many other icephobic surfaces. The material also exhibited an extraordinary durability, showing a very low long-term ice adhesion strength of ∼12.2 kPa after 50 icing/deicing cycles. Most importantly, the material was able to exhibit a self-healing property from mechanical damages in a sufficiently short time, which shed light on the longevity of icephobic surfaces in practical applications.

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“…For example, studies on soft adhesion, wetting, cavitation, and cell–surface interactions frequently implement PDMS as a model material. PDMS is used because it is commercially available (e.g., Sylgard 184), easy to prepare, and easy to tune the elastic modulus from a few megapascal down to a few kilopascal . This simple modulus control has enabled the growing and vast use of commercial PDMS elastomers with moduli below 100 kPa .…”

Section: Introductionmentioning

confidence: 99%

Extracting uncrosslinked material from low modulus sylgard 184 and the effect on mechanical properties

Glover

McLaughlin

McFarland

et al. 2020

Journal of Polymer Science

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Commercial silicone elastomers are commonly used in soft materials research due to their easily tunable mechanical properties.However, conventional polydimethylsiloxane (PDMS) elastomers with moduli below $100 kPa contain uncrosslinked free molecules, which play a significant role in their behavior. To utilize these materials, it is important to quantify what role these free molecules play in the mechanical response before and after their removal. We present a simple and inexpensive extraction method that enables the removal of free molecules from a lightly crosslinked sheet of Sylgard 184, a commercially available PDMS elastomer. The materials can contain a majority of free molecules yet maintain a thin and flat geometry without fractures after extraction. Subsequently, we compare the modulus, maximum stretchability, and hysteresis behavior with mixing ratios ranging from 60:1 to 30:1, before and after extraction. We show that the modulus, maximum stretchability, and dissipation increase upon extraction. Moreover, our approach offers a route to prepare crosslinked silicone elastomers with a modulus as low as $20 kPa without free molecules from a commercially available kit.

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Stick–Slip Friction of PDMS Surfaces for Bioinspired Adhesives

Cited by 53 publications

References 37 publications

Bacterial Adhesion on Soft Materials: Passive Physicochemical Interactions or Active Bacterial Mechanosensing?

Bacterial Adhesion on Soft Materials: Passive Physicochemical Interactions or Active Bacterial Mechanosensing?

Enhancing the Mechanical Durability of Icephobic Surfaces by Introducing Autonomous Self-Healing Function

Extracting uncrosslinked material from low modulus sylgard 184 and the effect on mechanical properties

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