Adhesion of heterogeneous thin films II: Adhesive heterogeneity

Xia, Shuman; Ponson, Laurent; Ravichandran, G.; Bhattacharya, Kaushik

doi:10.1016/j.jmps.2015.06.010

Cited by 53 publications

(31 citation statements)

References 37 publications

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“…We show using a semi-analytical approach and finite element analysis that varying the film thickness may lead to asymmetry in the peeling response. Furthermore, we show that this asymmetry is tunable and can reach higher values than that reported in several previous studies [18,22,27]. We also investigate the dependence of the asymmetry ratio on various model parameters.…”

Section: Introductionsupporting

confidence: 50%

“…[10][11][12][13]. This pointed to the possible role of adherent or interface heterogeneities in controlling the peeling response and opened new opportunities for utilizing these heterogeneities to improve the adhesion [14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

“…The peeling asymmetry has also been realized through a variety of techniques such as using non-uniform distribution of adhesive strength [22], adding arc patterns on the interface [18], changing the geometry of the interface through adding arrays of tilted microfibrils [23], and adding arrays of nano-fabricated polymer pillars coated with a thin layer of a synthetic polymer [24] inspired by geckos [25]. Other studies included using a duplex attachment pad composed of two geometrically identical wedge shaped blocks with different modulus of elasticity [26], or using shape memory polymer surfaces with geometrically asymmetric micro-wedge arrays for reversible dry adhesives [27].…”

Section: Introductionmentioning

confidence: 99%

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Adhesion Asymmetry in Peeling of Thin Films With Homogeneous Material Properties: A Geometry-Inspired Design Paradigm

Ghareeb

Elbanna

2019

Journal of Applied Mechanics

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Peeling of thin films is a problem of great interest to scientists and engineers. Here, we study the peeling response of thin films with nonuniform thickness profile attached to a rigid substrate through a planar homogeneous interface. We show both analytically and using finite element analysis that patterning the film thickness may lead to direction-dependent adhesion such that the force required to peel the film in one direction is different from the force required in the other direction, without any change to the film material, the substrate interfacial geometry, or the adhesive material properties. Furthermore, we show that this asymmetry is tunable through modifying the geometric characteristics of the thin film to obtain higher asymmetry ratios than reported previously in the literature. We discuss our findings in the broader context of enhancing interfacial response by modulating the bulk geometric or compositional properties.

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Section: Introductionsupporting

confidence: 50%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Adhesion Asymmetry in Peeling of Thin Films With Homogeneous Material Properties: A Geometry-Inspired Design Paradigm

Ghareeb

Elbanna

2019

Journal of Applied Mechanics

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“…There have also been research findings in other areas, outside of surface wetting, that demonstrate the importance of the distribution or patterning of surface substrates. Xia, et al (2015) studied the effect of the spatial patterning of the adhesive compound on the effective adhesion strength of thin tape. By changing the underlying patterns of the adhesive compound a wide range of behaviours with regards to the effective adhesion strength was observed.…”

Section: Spatial Distribution Of Hydrophobic Mineral Grains In Composmentioning

confidence: 99%

“…The nature of composite surfaces is a complex phenomenon where theoretical predictions do not always match experimental results (Xia, et al, 2015;Ramrus & Berg, 2006;Gautam & Jameson, 2012;Feng & Nguyen, 2016;Fosu, et al, 2015b). This is also true for the flotation of composite particles and because it is presently not possible to in a practical manner physically separate mineral particles in a bulk sample into specific composition or texture classes for characterisation such as contact angle or bubble detachment force measurements their flotation characteristics are frequently modelled by considering the mineral composition of the exposed surfaces along with the flotation characteristics of the mineral components making up the particle surfaces (see for example Ralston, et al (2007);Evans (2010) andFord, et al (2011)).…”

Section: Introductionmentioning

confidence: 99%

The effect of mineral grain textures at particle surfaces on flotation response

Vos¹

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This research investigates the contribution of the spatial arrangement of hydrophobic mineral grains at particles surface towards their flotation response and its implications for forecasting flotation response. The approach taken was to estimate this grain textural characteristic from particle sections and to identify how it affected the overall rougher and scavenger copper mineral flotation recovery from two industrial copper flotation circuits.For the second circuit the overall rougher flotation kinetic parameters for the copper mineral were also evaluated.The first contribution of this work is the demonstration that a novel textural indicator is relevant to understanding the contribution of exposed mineral grain texture on the flotation process. It is the first mineral grain textural indicator that considers both the size of the grains and the degree to which they are dispersed at the particle surface. When the indicator was applied to particle sections from flotation feed, concentrate and tail samples from two industrial copper flotation circuits, it was shown, for the first time, with confidence that while particle size and perimeter composition affect particle flotation response the spatial arrangement of the copper mineral grains at the particle surface plays a key role.For the iron-oxide-copper-gold ore, copper mineral grains in complex texture classes produced statistically higher overall rougher recoveries for the 0-20% perimeter composition class. Chalcopyrite grains in complex texture classes in the copper porphyry ore produced higher overall rougher and scavenger recoveries for the 20-40% perimeter composition class. For the 0-20% perimeter composition class statistically meaningful differences were observed for the +106 m size class. It was shown that the higher overall recoveries for the complex texture classes in this case were due to increases in the overall rougher rate of flotation, the proportions of recoverable chalcopyrite in the feed or both. For both ores the largest proportions of copper mineral within complex perimeter texture classes were within coarse particles and complex textures were less common when particle perimeters comprised more than 40% of the copper minerals. This demonstrated that in order to study the impact of this textural characteristic for the two ores it must be done within well-defined particle size and perimeter composition classes, an important outcome that has not been reported in the current literature.The second contribution is a three-step method for evaluating the flotation response of copper minerals within different grain texture classes namely; particle perimeter texture II estimation, determining coefficients of variation in the mass proportions of the target mineral within perimeter texture-composition classes and mass reconciliation and recovery calculations. Another key contribution is in applying the bootstrap resampling technique to estimate these coefficients. This demonstrated the sensitivity of seemingly feasible perimeter texture-compos...

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Fracture Mechanics of Heterogeneous Materials: Effective Toughness and Fluctuations

Ponson

2023

CISM International Centre for Mechanical Sciences

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Adhesion of heterogeneous thin films II: Adhesive heterogeneity

Cited by 53 publications

References 37 publications

Adhesion Asymmetry in Peeling of Thin Films With Homogeneous Material Properties: A Geometry-Inspired Design Paradigm

Adhesion Asymmetry in Peeling of Thin Films With Homogeneous Material Properties: A Geometry-Inspired Design Paradigm

The effect of mineral grain textures at particle surfaces on flotation response

Fracture Mechanics of Heterogeneous Materials: Effective Toughness and Fluctuations

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