Peeling behavior of a viscoelastic thin-film on a rigid substrate

Peng, Zhilong; Wang, Cong; Chen, Lei; Chen, Shaohua

doi:10.1016/j.ijsolstr.2014.10.011

Cited by 72 publications

(26 citation statements)

References 49 publications

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“…A periodically varying peeling force was found and the interface strength could be significantly improved by the wavy interface, especially by a hierarchically wavy one. Furthermore, similar improvement of peel-off force on rough substrates was also found experimentally in a visco-elastic film case (Peng et al, 2014).…”

Section: Resultssupporting

confidence: 82%

Peeling behavior of a thin-film on a corrugated surface

Peng

Chen

2015

International Journal of Solids and Structures

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a b s t r a c tThe peeling behavior of a thin-film perfectly adhering on a corrugated substrate is investigated theoretically. Unlike the usually adopted average method of introducing an effective adhesion energy, the effect of substrate roughness is considered directly in this paper and an accurate closed-form solution to the peel-off force under quasi-static peeling process is achieved. Comparing to the results obtained by the average method and those of a smooth substrate case shows that the peel-off force in the present model varies periodically, similar to the roughness of substrates. Furthermore, it is interesting to find that the peeling strength (defined by the maximal peel-off force) of the corrugated interface can be significantly improved with the increase of substrate roughness, while the peel-off force obtained by the average method was found to decrease monotonically or increase first and then decrease with the increasing surface roughness. Spontaneous detachment happens locally at the valley or crest of each asperity when the substrate roughness is large enough, but it does not influence the enhanced trend of the maximal peel-off force. The effect of mode-mixity dependent interface adhesion energy on the peel-off force is also considered, by which the interface peeling strength is further improved. The results in this paper should be helpful for deep understanding of the interface behavior between a film and a rough substrate and be useful for the design of film/substrate interfaces with high interface quality in nano-devices.

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Section: Resultssupporting

confidence: 82%

Peeling behavior of a thin-film on a corrugated surface

Peng

Chen

2015

International Journal of Solids and Structures

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“…To conclude, we also observe that the behavior of the forceextension curves, characterized by a force plateau, is in good qualitative agreement with several results obtained in peeling experiments and simulations concerning adhesive films and bioclinical structures [101][102][103][104][105].…”

Section: Hard Device: Helmholtz Ensemblesupporting

confidence: 89%

Role of temperature in the decohesion of an elastic chain tethered to a substrate by onsite breakable links

Florio

Puglisi

Giordano

2020

Phys. Rev. Research

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We analyze the role of temperature in the rate-independent cohesion and decohesion behavior of an elastic film, mimicked by a one-dimensional mass-spring chain, grounded to an undeformable substrate via a onedimensional sequence of breakable links. In the framework of equilibrium statistical mechanics, in both isometric (Helmholtz ensemble) and isotensional (Gibbs ensemble) conditions, we prove that the decohesion process can be described as a transition at a load threshold, sensibly depending on temperature. Under the classical assumption of having a single domain wall between attached and detached links (zipper model), we are able to obtain analytical expressions for the temperature dependent decohesion force, qualitatively reproducing important experimental effects in biological adhesion. Interestingly, although the two ensembles exhibit a similar critical behavior, they are not equivalent in the thermodynamic limit since they display dissimilar force-extension curves and, in particular, significantly different decohesion thresholds.

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“…Moreover, contrary to shear strength trends, the peel off strength and peel‐off force is highest with SS and lowest with acrylic substrate. To understand the underlying reason behind observed trends, the surface roughness of flexorb and pure PDMS layer is measured using surface profilometer . The roughness of flexorb observed to be higher (0.04 µm) than pure PDMS (0.03 µm) which may be due to the embedding of high strength fillers in relatively softer PDMS matrix.…”

Section: Resultsmentioning

confidence: 99%

Design and Fabrication of a Multifunctional Flexible Absorber (Flexorb) in the UV–Vis–NIR Wavelength Range

Ghai

Baranwal

Singh

et al. 2019

Adv Materials Technologies

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breaking strain. [18] 4) The creasing in thin foils during fabrication and operations pose another challenge. [19] 5) The rigid and metallic foil-based absorbers will be difficult to mount on surfaces with complex geometry and curved contours. 6) The integrity of these absorbers with variety of underlying surfaces made of metals and polymers have not been established yet. To overcome some of these issues, flexible optical absorbers are developed using nanocomposites or thin metal foils as base substrate. [9,20] More recently, Zeranska-Chudek et al. has reported the flexible absorber based on grapheme/ polydimethylsiloxane (PDMS) nanocomposite with an average absorption of 95% in 400-1600 nm wavelength range. [21] The lower absorption capacity and narrow operating range is again a critical issue with this absorber. [22,23] Unavailability of an absorber which can meet all these functional requirements naturally leads to a fundamental question that how we can fabricate a near perfect flexible absorber which can overcome these issues. Here we report the fabrication of a novel flexible absorber (flexorb) with an absorbing capacity of >99% in the whole UV-vis-NIR broadband region using a simple and economical process. Apart from absorbing capacity, the mechanical integrity of flexible absorber with different types of underlying surfaces is an important parameter in order to qualify them for a variety of applications. A unified study which deals with the absorbing capacity and mechanical integrity of flexible absorbers has not been carried out to the best of author's knowledge and has been thoroughly performed in the current work. The use of PDMS as base matrix material ensures the flexibility as well as integrity of multifunctional absorber with different types of surfaces. Texturing and addition of ZnO, Fe, and carbon nanotubes (CNTs) as reinforcing fillers increases the photonic path length through multiple scattering of incident light and hence augments the absorbing capacity of PDMS. Additionally, the presence of CNTs helps to achieve impedance matching and thus significantly reduces the reflection of incident beam at absorber-surrounding interface. All these factors combined in a synergistic way and results in a near perfect absorption of incident light in the broader wavelength range of 300-2000 nm. Moreover, the flexorb shows multifunctional behavior in the sense that it can avoid environmental assisted degradation due to its observed hydrophobic and self-cleaning characteristics. In addition the improved Synthesis of a near perfect absorber is required for many technologically challenging areas. Most of the existing super absorbers are rigid and usually exploit the light in the visible range only leaving a significant part of available energy in the solar spectrum unutilized. Here the synthesis of a multifunctional flexible absorber (flexorb) with an ultrahigh absorbing capacity of >99% in the whole UV-vis-NIR region is reported. Flexorb is fabricated by texturing the polydimethylsiloxane matrix reinforced by Z...

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Peeling behavior of a viscoelastic thin-film on a rigid substrate

Cited by 72 publications

References 49 publications

Peeling behavior of a thin-film on a corrugated surface

Peeling behavior of a thin-film on a corrugated surface

Role of temperature in the decohesion of an elastic chain tethered to a substrate by onsite breakable links

Design and Fabrication of a Multifunctional Flexible Absorber (Flexorb) in the UV–Vis–NIR Wavelength Range

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