Wetting-Induced Formation of Quasiperiodical Wrinkling Patterns in Alginate-Based Coatings

Baffoun, Ayda; Haïdara, Hamidou; Dupuis, Dominique; Viallier, Pierre

doi:10.1021/la7007107

Cited by 13 publications

(12 citation statements)

References 19 publications

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“…PS‐Ti multilayers put in contact with toluene vapors can generate various wrinkled patterns, considering that solvent diffusion is equivalent to an increase of temperature for the PS layer inducing a drastic decrease of elastic modulus. Baffoun et al reported a type of instability which involved the dissolution of the polymeric substrate by the solvent drop and resulted in the formation of finger patterns. While the formation of peripheral corrugation was due to the upward stretching force exerted by the underlying droplet composed of etchant and etching byproducts .…”

Section: Resultsmentioning

confidence: 82%

Solvent‐induced surface instability of thin metal films on a polymer substrate

Xue

Wang

Zeng

et al. 2017

Surface & Interface Analysis

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The solvent-provoked formation and evolution of thin film buckling-delamination on a compliant substrate have been studied. The film surface is observed by an optical microscope showing a remarkable dynamic buckling-delamination development and a subsequent stable branchedstraight state. It is revealed that the initiation, propagation, and the resulting patterns of film buckles are strongly dependent on the solvent type, film stress, interfacial adhesion, and film thickness. The buckling could be controlled further by a reasonable chemical solvent configuration and used to provide useful information for the pattern creation on polymer systems in diverse fields, such as micro/nanofabrication and optics. KEYWORDS buckle, film stress, polymer substrate, solvent diffusion, thin film 1 | INTRODUCTION Thin films and coatings are widely used in a substantial range of technological applications, ranging from protective layers to applications in optical, electric, engineering, biomedical, nuclear, and thermal fields. The high performance and reliability of film-substrate structures are strongly dependent on their mechanical integrity and the adhesion to the substrate. Failure of thin film coatings can occur in various forms, such as blistering, delamination, and dewetting.Surface instability is ubiquitous which can be frequently observed in many systems, involving metallic or soft polymeric thin films on elastomeric substrates, hydrogels on a rigid flat substrate, and biological tissues in response to external stimuli, such as mechanical pressure, 1,2 temperature, 3 pH level, 4 light, 5 humidity, 6 and solvent environment. 7 Although the phenomenon has been treated as a nuisance to be avoided, researchers have extensively exploited the surface instability in a wide range of applications ranging from microelectronics, 8,9 biotechnology, 10 fabrication of structures 11 to optical systems 12,13 and microfluidic devices. 14,15 Recently, buckling has attracted much attention as a useful approach for surface pattern controlment and material property characterization, 16,17 which arises when a relatively thick substrate-supported thin layer undergoes an excessive compression. The compression generally originates from the mechanical constants mismatch between different layers, which can be utilized to create interesting topographical patterns such as straight-sided wrinkles, 18 telephone cord structures, 19-23 and circular blisters. 24,25 A range of different strategies have been explored to produce patterns in thin films. Laser-induced well-ordered and controllable telephone cord patterns were constructed in as-deposited metallic thin films. 26 Pre-patterning the thin film under strain, in combination with a triggered release of the adhesion via electrochemistry, allowed for the design of well-controlled sub-micrometer. 27 Formation of mutually orthogonal multi-scale instability modes was triggered by electric-thermal loads. 28 A freely floating polymer film wrinkled under the capillary force exerted by a drop of water. 29 It is...

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Section: Resultsmentioning

confidence: 82%

Solvent‐induced surface instability of thin metal films on a polymer substrate

Xue

Wang

Zeng

et al. 2017

Surface & Interface Analysis

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“…These final drying spots and crystallization patterns, of which a general view is shown in Figure 1, are composed of an assembly of well-defined dendrites crystals. Compared to most reported wetting-induced patterns in polymer coatings, 1,4,5 the self-assembly structures appearing here originate directly from molecular-scale interactions between randomly distributed chains, leading to unrevealed crystallization patterns in a polymer, which usually forms crystalline phases only under strong and oriented stress fields. 6,7 Indeed, alginate is a polysaccharide whose chains consist of regularly alternating blocks of L-guluronic acid (G) n , D-mannuronic acid (M) m , and (MG) p residues (Figure 2) which have strong conformational differences.…”

Section: Introductionmentioning

confidence: 77%

Unrevealed Self-Assembly and Crystallization Structures of Na−Alginate, Induced by the Drying Dynamics of Wetting Films of the Aqueous Polymer Solution

2010

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Sodium alginate is a natural, water-soluble polysaccharide polymer which is not known so far to crystallize spontaneously. Here we show that the controlled drying of wetting films of the aqueous solution of this biopolymer can lead to the formation of large-scale self-assembly and crystallization structures. We show that the structures which grow exclusively within the final drying spot arise from the ordered assembly of the concentrated polysaccharide chains mediated by the condensation of trace cations present in the system. Moreover, we show that these trace cations, which are dragged with the polysaccharide chains and concentrated by the drying process inside the residual spot, come mainly from the ultrapure water used for the experiment. This study does not bring only new insights on the behavior and structural properties of polysaccharide polymers. It also shows that the use of water, even of high purity (conductivity e1 μS 3 cm -1 ), can lead to singular and unexpected effects when dealing with sensitive materials and experiments (polysaccharide/DNA, drying drops).

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“…5f), characteristic of swelling-induced wrinkles in SA-based coatings. 25 Though these fibrillar dendrites that definitely constitute SA/NPs composite hydrogel microfibers were made stable over months (in ambient conditions) upon gelation, it was practically impossible to detach and collect them from the substrate and the under-layer film, for any use at the lab-scale. To circumvent this, we used a microgrooved PDMS support as a template to fabricate the ''isolated'' composite hydrogel microfibers, using the principle of capillary-driven suction and filling of such microchannels by a liquid (Fig.…”

Section: Drying Of the Bi-component (Mixed Sa/nps) Solutionsmentioning

confidence: 99%

From highly ramified, large scale dendrite patterns of drying “alginate/Au NPs” solutions to capillary fabrication of lab-scale composite hydrogel microfibers

2012

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The processes of complexation, aggregation and self-assembly involving natural polymers are not only ubiquitous in biological systems (proteins), but they are also crucial for environmental and technological applications (humic acids, polysaccharide-based hydrogels). In this paper, we address these issues through a model study of the drying structures of bi-component solutions of oppositely charged alginate polysaccharide and gold nanoparticles. Unlike single component alginate and nanoparticle solutions, we show that the sessile drops of the bicomponent mixtures lead, upon drying, to fibrillar dendrite patterns of rather unusual size and ramification density. We discuss the key parameters and the mechanisms which drive the formation of these highly ramified dendrite structures. These involve, on the one hand the composition (residual salt content), the drying mode and nanoparticle size, and on the other hand, the shear-drainage and concentration, the counterion condensation, and the co-assembly and co-crystallization of the polymer, the nanoparticles and the residual salts. Finally, inspired by these fibril-like drying patterns and the gel forming property of alginate, we have developed a microfabrication process of composite hydrogel microfibers, which we showed to be an effective and flexible tool for a lab-scale production, characterization and functional optimization of such nanomaterials, before large production.

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Wetting-Induced Formation of Quasiperiodical Wrinkling Patterns in Alginate-Based Coatings

Cited by 13 publications

References 19 publications

Solvent‐induced surface instability of thin metal films on a polymer substrate

Solvent‐induced surface instability of thin metal films on a polymer substrate

Unrevealed Self-Assembly and Crystallization Structures of Na−Alginate, Induced by the Drying Dynamics of Wetting Films of the Aqueous Polymer Solution

From highly ramified, large scale dendrite patterns of drying “alginate/Au NPs” solutions to capillary fabrication of lab-scale composite hydrogel microfibers

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