Adhesion and Mechanical Properties of PDMS-Based Materials Probed with AFM: A Review

Vlassov, Sergei; Oras, Sven; Antsov, Mikk; Sosnin, Ilya M.; Polyakov, Boris; Shutka, A.; Krauchanka, M.Yu.; Dorogin, Leonid

doi:10.1515/rams-2018-0038

Cited by 44 publications

(32 citation statements)

References 91 publications

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“…The k5 and k10 nanocomposite films’ wettability increased, resulting in more hydrophilic surfaces. Krotil et al and Vlassov et al reported that a silicon tip showed higher adhesive forces with a hydrophilic surface than with a hydrophobic surface, therefore, changes in hydrophilicity resulted in changes in the adhesion values [ 45 , 46 ]. Laitinen et al reported that the interaction forces between the tip and the sample surface depended on surface geometry, and indicated that the value of adhesion increased with increasing surface roughness, which our results confirm [ 47 ].…”

Section: Resultsmentioning

confidence: 99%

The Quantitative Nanomechanical Mapping of Starch/Kaolin Film Surfaces by Peak Force AFM

et al. 2021

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Starch films modified with additives are materials increasingly being used in the production of packaging. These types of biopolymers can, to a considerable degree, replace plastic, contributing to the reduction in both production and waste management costs. However, they should be characterised by specific mechanical and surface parameters which determine their application. In the presented work, the PeakForce Quantitative Nanomechanics Mapping (PFQNM) method was applied to analyse a starch-based biopolymer modified with two different kaolin clay contents (5% and 10%). The technique used facilitates the assessment of the correlation of Atomic Force Microscope AFM height parameters with nanomechanical ones which provide the definitions of mutual interactions and allow the possibility to analyse materials in respect of various details. The investigated material was mapped in the Derjaguin–Muller–Toporov (DMT) modulus, adhesion and height domains. The results obtained indicated the impact of additives on the determined parameters. Increases in the DMT modulus and the adhesion force, along with the kaolin content, were observed. The enhancement of starch films with kaolin clay also induced growth in the surface roughness parameters.

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Section: Resultsmentioning

confidence: 99%

The Quantitative Nanomechanical Mapping of Starch/Kaolin Film Surfaces by Peak Force AFM

et al. 2021

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“…PDMS is a synthetic viscoelastic polymer with unusual rheological properties, and converts to a hydrophobic elastomer after curing. [ 158 ] Hydrophilic PDMS can also be fabricated by oxygen plasma treatment and UV radiation of the cured films. [ 159 ] Mechanical properties of the thin film can be tailored by controlling the curing (crosslinking) degree.…”

Section: Substratesmentioning

confidence: 99%

Droplet‐Based Techniques for Printing of Functional Inks for Flexible Physical Sensors

2021

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Printing processes can be broadly classified into "contact" and "non-contact" printing. In contact printing, the ink is transferred directly from a patterned medium (engraved roller or stencil) onto a substrate, while in non-contact printing the ink droplets are ejected from a series of nozzles on the intended surface. [9] Offset, flexography, gravure, and screen printing are among the most common contact printing methods, while jet-printing processes constitute noncontact counterpart. Jet-printing involves a series of computer-controlled pattern reproduction techniques, which can be subdivided into inkjet, aerosol-jet, and electrohydrodynamic-jet printing. In these techniques, the ink is deposited in the form of droplets hence named "droplet-based" printing. Inkjet is a wellestablished technology, which is now finding its way in to industries, [10] while aerosol jet is a relatively new technology developed for printing on non-planar substrates. The first prototype of electrohydrodynamic jet printing was patented for graphical patterning, but later on altered for high-resolution electronic printing in nanometer scale. [11] Flexible physical sensors fabricated by printing techniques are revolutionizing healthcare sector by befitting portable health watching and remote medical solutions. [12] These devices not only enable long-term tracking of physiological signals, but also enormously assist in delocalization of medical services from hospitals to homes. Flexible physical biosensors are widely used to record various biophysical signals such as pulse rate, body temperature, vocal fold vibrations, skeletal muscle contractions, closure of heart valves, breath rate, and movements in the gastrointestinal tract. [13] However current devices fabricated by printing techniques, suffer from low sensitivity and poor repeatability, therefore there is room for huge improvement in this field through specially formulated inks and printing process control. [14] Herein, we present a comprehensive discussion on basics of droplet-based printing techniques (inkjet, aerosol jet, and electrohydrodynamic jet), followed by an in-depth review of metal, carbon, polymer, and ceramic functional inks. We also delve into various post-processing (sintering) methods used to enable flexible devices on substrates with low thermal resistance. The field of flexible devices is vast, and the focus of this paper is on flexible physical sensors fabricated through droplet-based Printed electronics (PE) is an emerging technology that uses functional inks to print electrical components and circuits on variety of substrates. This technology has opened up new possibilities to fabricate flexible, bendable, and form-fitting devices at low-cost and fast speed. There are different printing technologies in use, among which droplet-based techniques are of great interest as they provide the possibility of printing computer-controlled design patterns with high resolution, and greater production flexibility. Nanomaterial inks form the heart of this technology, enablin...

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“…In the AFM image, it is possible to capture images from the surface of biodegradable samples with a precision nanometer inline X, Y and an angstrom in Z-direction approving three-dimensional structure and size. The AFM image can provide information on the properties of material surfaces such as hardness and surface adhesion by measuring the forces between the probe and the sample as a function of their mutual separation in AFM analysis that this method is sometimes referred as atomic force spectroscopy (AFS) [51]. As demonstrated in Fig.…”

Section: Characterizationmentioning

confidence: 99%

Kefiran/poly(vinyl alcohol)/poly(vinyl pyrrolidone) composite nanofibers: fabrication, characterization and consideration of effective parameters in electrospinning

et al. 2020

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The kefiran/polyvinyl alcohol and polyvinyl pyrrolidone nanofibers were effectively fabricated for the first time using electrospinning of poly(vinyl alcohol), poly(vinyl pyrrolidone) and kefiran blend solution. The effect of solution parameters, such as kefiran concentration and poly(vinyl alcohol)/poly(vinyl pyrrolidone) mixing ratio, were considered. The parameters' effects, such as voltage, nozzle-to-collector distance and feeding rate on nanofibers morphology, were also checked by the scanning electron microscopy images. After changing the parameters on different steps, designed by the chemo metrics software, the finest nanofibers were produced in the following conditions: 2% kefiran concentration, 30/70 kefiran/polymer mixing ratio, 12 kV voltage, 200 mm needle-to-collector distance and 0.5 (mL/h) polymer injection rate. The nanofibers produced in these conditions were uniform without knots or adhesion in the lowest diameter of 156 nm. Kefiran concentration and kefiran/polymer mixing ratio were found as the most effective parameter in the morphology and diameter size of the nanofibers. The attenuated total reflectance (ATR-Ft-IR), atomic force spectroscopy, differential scanning calorimeters and thermal gravimetric analysis were used to investigate molecular structures, threedimensional morphology and heating properties of the nanofibers, respectively.

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Adhesion and Mechanical Properties of PDMS-Based Materials Probed with AFM: A Review

Cited by 44 publications

References 91 publications

The Quantitative Nanomechanical Mapping of Starch/Kaolin Film Surfaces by Peak Force AFM

The Quantitative Nanomechanical Mapping of Starch/Kaolin Film Surfaces by Peak Force AFM

Droplet‐Based Techniques for Printing of Functional Inks for Flexible Physical Sensors

Kefiran/poly(vinyl alcohol)/poly(vinyl pyrrolidone) composite nanofibers: fabrication, characterization and consideration of effective parameters in electrospinning

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