Meso-Patterning of Thin Polymer Films by Controlled Dewetting: From Nano-Droplet Arrays to Membranes

Mukherjee, Rabibrata; Gonuguntla, Manoj; Sharma, Ashutosh

doi:10.1166/jnn.2007.771

Cited by 41 publications

(68 citation statements)

References 29 publications

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“…Assuming the drop to be a spherical cap, the drop boundary on the substrate, that is, the three-phase contact line (TPCL), where solid, liquid, and vapor meet, has the shape of a perfect circle, for an ideal smooth surface. In this article, we do not elaborate on rough or prepatterned surfaces, where there may be interesting deviations [88,89]. We also leave out from our discussion sessile drops describing works on soft or liquid surfaces.…”

Section: Evaporation Of a Pure Fluidmentioning

confidence: 99%

Droplet Drying Patterns on Solid Substrates: From Hydrophilic to Superhydrophobic Contact to Levitating Drops

Tarafdar

Tarasevich

Choudhury

et al. 2018

Advances in Condensed Matter Physics

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This review is devoted to the simple process of drying a multicomponent droplet of a complex fluid which may contain salt or other inclusions. These processes provide a fascinating subject for study. The explanation of the rich variety of patterns formed is not only an academic challenge but also a problem of practical importance, as applications are growing in medical diagnosis and improvement of coating/printing technology. The fundamental scientific problem is the study of the mechanism of microand nanoparticle self-organization in open systems. The specific fundamental problems to be solved, related to this system, are the investigation of the mass transfer processes, the formation and evolution of phase fronts, and the identification of mechanisms of pattern formation. The drops of liquid containing dissolved substances and suspended particles are assumed to be drying on a horizontal solid insoluble smooth substrate. The chemical composition and macroscopic properties of the complex fluid, the concentration and nature of the salt, the surface energy of the substrate, and the interaction between the fluid and substrate which determines the wetting all affect the final morphology of the dried film. The range of our study encompasses the fully wetting case with zero contact angle between the fluid and substrate to the case where the drop is levitated in space, so there is no contact with a substrate and angle of contact can be considered as 180 ∘ .

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Section: Evaporation Of a Pure Fluidmentioning

confidence: 99%

Droplet Drying Patterns on Solid Substrates: From Hydrophilic to Superhydrophobic Contact to Levitating Drops

Tarafdar

Tarasevich

Choudhury

et al. 2018

Advances in Condensed Matter Physics

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“…The proposed method will be particularly useful in many applications in which rapid prototyping of relatively large (~ cm 2 ) mesopatterned polymer surfaces with simple features having sizes ranging from 200 nm-10 microns are required in large quantities. Applications involving structures on these length scales include areas like carbon-MEMS and microbattery, controlled dewetting on patterned surfaces (Mukherjee et al 2007a) and surfaces for nano-biotechnology applications etc. Also, an easy availability of patterned surfaces on these scales can enable in situ investigations of interesting phenomena and their dynamics with optical microscopy.…”

Section: Introductionmentioning

confidence: 99%

Soft lithography meets self-organization: Some new developments in meso-patterning

et al. 2008

Self Cite

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This is a brief review of our recent and ongoing work on simple, rapid, room temperature, pressure-less and large area (~ cm 2 ) imprinting techniques for high fidelity meso-patterning of different types of polymer films. Examples include soft solid polymer films and surfaces like cross-linked polydimethylsiloxane (PDMS) and polyacrylamide (PAA) based hydrogels, thermoplastics like polystyrene (PS), polymethylmethacrylate (PMMA) etc both on planar and curved surfaces. These techniques address two key issues in imprinting: (i) attainment of large area conformal contact with the stamp, especially on curved surfaces, and (ii) ease of stamp detachment without damage to the imprinted structures. The key element of the method is the use of thin and flexible patterned foils that readily and rapidly come into complete conformal contact with soft polymer surfaces because of adhesive interfacial interactions. The conformal contact is established at all length scales by bending of the foil at scales larger than the feature size, in conjunction with the spontaneous deformations of the film surface on the scale of the features. Complex two-dimensional patterns could also be formed even by using a simple one-dimensional master by multiple imprinting. The technique can be particularly useful for the bulk nano applications requiring routine fabrication of templates, for example, in the study of confined chemistry phenomena, nanofluidics, bio-MEMS, micro-imprinting, optical coatings and controlled dewetting.

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“…[1][2][3][4][5] The precise control of dewetting structures has been widely reported as a simple, effective and non-destructive method to fabricate ordered polymer patterning. [6][7][8][9] One of the main approaches is to control the dewetting structures via the assistance of templates. Previous papers have reported template-directed and template-assisted dewetting in fabricating different micro-and nanoscale structures over large areas.…”

Section: Introductionmentioning

confidence: 99%

Dewetting of a pre-patterned thin polymer bilayer: influence of the instability mode

Chen

Zou

2017

RSC Adv.

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In this paper, the influence of film thickness on the layer instability mode of a thin polymer bilayer (poly(methylmethacrylate) (PMMA)/polystyrene (PS)/Si substrate) has been investigated. The experimental results show that kinetic forces can greatly influence the instability process of the thin polymer bilayer. In the case of PS-2.4K (M w-PS ¼ 2.4 kg mol ), only the PMMA layer ruptures on the PS layer and the dewetting process is a thermodynamically controlled one. Besides, the influence of the instability mode on the template-assisted dewetting process of the thin polymer bilayer also was studied. After annealing the pre-patterned bilayer, in the case of the kinetically controlled dewetting, the PMMA film bends to conform to the buried PS-PMMA interface and concave half cylinder grooves form during the dewetting process; however, in the case of the thermodynamically controlled dewetting, PMMA chains move to the top of cylinder stripes and obvious trenches are found after PMMA chains are etched. This proposes a simple method to obtain different surface structures by changing the instability mode of the thin polymer bilayer.

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Meso-Patterning of Thin Polymer Films by Controlled Dewetting: From Nano-Droplet Arrays to Membranes

Cited by 41 publications

References 29 publications

Droplet Drying Patterns on Solid Substrates: From Hydrophilic to Superhydrophobic Contact to Levitating Drops

Droplet Drying Patterns on Solid Substrates: From Hydrophilic to Superhydrophobic Contact to Levitating Drops

Soft lithography meets self-organization: Some new developments in meso-patterning

Dewetting of a pre-patterned thin polymer bilayer: influence of the instability mode

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