Strong van der Waals Adhesion of a Polymer Film on Rough Substrates

Klatt, Juliane; Barcellona, Pablo; Bennett, Robert; Bokareva, Olga S.; Feth, H.; Rasch, Andreas Stephan; Reith, Patrick; Buhmann, Stefan Yoshi

doi:10.1021/acs.langmuir.7b01381

Cited by 6 publications

(5 citation statements)

References 32 publications

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“…The chemical reaction of the adhesive creates covalent and hydrogen bonds, resulting in durable bonding. However, this bonding process is limited to certain materials owing to chemical affinities; moreover, it may be complicated and harmful. − In lieu of chemical bonding, physical bonding involving microstructures and nanostructures created on metal surfaces has been proposed to enhance metal–polymer adhesion. − First, molten polymer fills the formed structures; subsequently, the hardened polymer forms metal–polymer joints through mechanical interlocking. To form strong joints, mechanical interlocking should be improved.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Steel Sandwich Sheet Adhesion Using Mechanical Interlocking Structures Formed by Electrochemical Etching

Kim

Yoo

et al. 2021

Langmuir

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Steel sandwich sheets (steel−polymer−steel), which are composed of lightweight polymers bonded on both sides with rigid steel sheets, have recently been developed as functional lightweight materials. In this study, a steel sandwich sheet (electrogalvanized (EG) steel sheet−polypropylene (PP)−EG steel sheet) with improved normal adhesion is fabricated without adhesives. Instead, adhesion is achieved via mechanical interlocking between the etched EG steel sheets and PP. Hierarchical structures were formed on the EG steel sheet surface by electrochemical etching to attain effective mechanical interlocking for improving normal adhesion without any adhesives. In the case of the EG steel sheet etched at 6 V for 7 s, a high fraction (∼35%) of holes (size: <1 μm 2 ) with nanoscale scalloped structures was formed on the EG steel sheet surface. The normal adhesion test result of the fabricated steel sandwich sheet showed that the adhesion strength increased from virtually 0 (bare) to 559.6 kPa as a result of mechanical interlocking. The results of the focused ion beam−scanning electron microscopy and energy-dispersive spectrometry analyses confirmed the cohesive failure of PP resulting from the successful mechanical interlocking of PP with the holes formed on the etched EG steel sheet. To examine the effect of hierarchical structures on the normal adhesion of the steel sandwich sheet, finite element analysis was implemented.

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Section: Introductionmentioning

confidence: 99%

Enhancement of Steel Sandwich Sheet Adhesion Using Mechanical Interlocking Structures Formed by Electrochemical Etching

Kim

Yoo

et al. 2021

Langmuir

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“…8 ), one can see that the BBE left a material trace propagating along the adhesion interface, leading to significant deformation of the BBE. Different from ionic or covalent bonds of common adhesive materials that lead to high shear strength through the “lock and key” mechanism 50 , the adhesive property of hydrophobic PDMS BBE is possibly derived from the Van der Waals force 51 , 52 . This could be attributed to the highly-branched long side chains and ultra-softness of the solvent-free BBE that maximize contact surfaces as well as conformity when interfacing with different substrates 34 .…”

Section: Resultsmentioning

confidence: 99%

Conductive and elastic bottlebrush elastomers for ultrasoft electronics

Wang

Lin

et al. 2023

Nat Commun

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Understanding biological systems and mimicking their functions require electronic tools that can interact with biological tissues with matched softness. These tools involve biointerfacing materials that should concurrently match the softness of biological tissue and exhibit suitable electrical conductivities for recording and reading bioelectronic signals. However, commonly employed intrinsically soft and stretchable materials usually contain solvents that limit stability for long-term use or possess low electronic conductivity. To date, an ultrasoft (i.e., Young’s modulus <30 kPa), conductive, and solvent-free elastomer does not exist. Additionally, integrating such ultrasoft and conductive materials into electronic devices is poorly explored. This article reports a solvent-free, ultrasoft and conductive PDMS bottlebrush elastomer (BBE) composite with single-wall carbon nanotubes (SWCNTs) as conductive fillers. The conductive SWCNT/BBE with a filler concentration of 0.4 − 0.6 wt% reveals an ultralow Young’s modulus (<11 kPa) and satisfactory conductivity (>2 S/m) as well as adhesion property. Furthermore, we fabricate ultrasoft electronics based on laser cutting and 3D printing of conductive and non-conductive BBEs and demonstrate their potential applications in wearable sensing, soft robotics, and electrophysiological recording.

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“…After removal from the conductive ink, the flexible film with the adhered CB/Gr conductive layer is dried. On the contact surface between the conductive layer and the flexible substrate, the van der Waals forces between the conductive nanoparticles and the flexible substrate enable the conductive nanoparticles to adhere to the flexible substrate, , while the van der Waals forces between the conductive particles cause their self-adhesion. , Notably, the contact area between the flexible substrate and the conductive composite material is greatly increased after the sandpaper inversion, and the interactions between the conductive material and the conductive material and the conductive material and the flexible substrate enable more conductive composite materials to be adhered to the flexible substrate, thereby improving the adhesion of the conductive layer on the flexible substrate. Finally, silver paste and copper wires are employed to lead out the electrodes, resulting in a flexible strain sensor with a wide strain range and high sensitivity.…”

Section: Resultsmentioning

confidence: 99%

High Performance Strain Sensor Based on Carbon Black/Graphene/Ecoflex for Human Health Monitoring and Vibration Signal Detection

Xia,

He,

et al. 2023

ACS Appl. Nano Mater.

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In recent years, there has been a significant surge of interest in flexible strain sensors within the domains of wearable electronics and human−computer interaction. However, as these fields continue to advance rapidly, there is an urgent need to improve the comprehensive performance of flexible strain sensors including sensitivity, sensing range, response speed, and durability. In this study, we address this issue by transferring carbon black/ graphene (CB/Gr) conductive nanocomposites onto the surface of an Ecoflex flexible substrate, which has been pretreated using sandpaper to enhance adhesion. The resulting flexible strain sensor exhibits high sensitivity, with a gauge factor of 51.4, while offering a wide sensing range of 100%. Notably, this sensor demonstrates high performance across various aspects, including a fast response time (60 ms) and excellent durability (up to 4000 stretching−releasing cycles). The versatility of this sensor is evident in its ability to effectively monitor both small strain activities, such as speech recognition, and larger strain activities, such as elbow bending. Moreover, the sensor has demonstrated outstanding performance in various application scenarios, including human health and motion condition monitoring as well as acoustic wave and vibration signals detection. Consequently, this highlights the sensor's remarkable adaptability and substantial potential for wide-range applications in these domains.

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Strong van der Waals Adhesion of a Polymer Film on Rough Substrates

Cited by 6 publications

References 32 publications

Enhancement of Steel Sandwich Sheet Adhesion Using Mechanical Interlocking Structures Formed by Electrochemical Etching

Enhancement of Steel Sandwich Sheet Adhesion Using Mechanical Interlocking Structures Formed by Electrochemical Etching

Conductive and elastic bottlebrush elastomers for ultrasoft electronics

High Performance Strain Sensor Based on Carbon Black/Graphene/Ecoflex for Human Health Monitoring and Vibration Signal Detection

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