Dewetting at a Polymer−Polymer Interface:  Film Thickness Dependence

Wang, Chun; Krausch, Georg; Geoghegan, Mark

doi:10.1021/la010585q

Cited by 85 publications

(118 citation statements)

References 18 publications

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“…The liquid-liquid dewetting is much more complicated since it may involve the vertical migration of polymer, the diffusion between the upper and bottom layers at the interface, and the resultant deformation of the interface. Therefore, the viscoelasticity of polymers, the miscibility of the upper and bottom layers, and the interaction between polymer and substrate can produce remarkable effect on the stability and resultant structure evolution in a bilayer system [11][12][13][14][15]. For example, the three-dimensional long-wave nonlinear analysis results of Sharma and his co-workers suggested that the film thicknesses, surface energies of polymers, and the viscosities of the films have significant influence on the dewetting mode selection, pathway, and the final morphology of dewetting [16].…”

Section: Introductionmentioning

confidence: 99%

Stability and structure evolution in PMMA/SAN bilayer films upon solvent annealing

et al. 2016

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The stability of bilayer polymer films upon solvent annealing has been investigated with the help of atomic force microscopy (AFM) by taking PMMA [poly(methyl methacrylate), the upper layer] and SAN [poly(styrene-ran-acrylonitrile), the bottom layer] system as an example. Our results indicate that the stability and structure evolution depend crucially on the selectivity of the adopted annealing solvents. In the vapor of acetic acid (HAc, the selective solvent for PMMA), the upper PMMA layer dewets on the stable bottom SAN layer; upon annealing in 1, 2-dichlorobenzene (OBD, the selective solvent for SAN) vapor, the bilayer film remains stable because it is very hard for OBD molecules to penetrate and cross the upper PMMA layer. When dimethylformamide (exhibiting much higher solubility for SAN than PMMA) is used to anneal the specimen, the solvent molecules swell and cross the upper PMMA layer and enrich in the bottom SAN layer. As a result, SAN layer dewets the substrate, producing some SAN droplets while the upper PMMA is Bcarried^by the movement of SAN. This is the reason for the rupture of the upper film and the formation of BSAN droplets covered by PMMA islands.K eywords Dewetting . Bilayer . Solvent annealing . AFM . PMMA/SAN

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Section: Introductionmentioning

confidence: 99%

Stability and structure evolution in PMMA/SAN bilayer films upon solvent annealing

et al. 2016

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“…This applied modeling paper is motivated by the recent experiments on dewetting of non-reactive, immiscible metallic bilayers [16], and the need to better understand the physical mechanisms leading to spatial ordering of particles and the morphological pathways towards the final particle morphologies. The experimental [17][18][19][20][21][22][23][24] and theoretical [25][26][27][28][29][30][31][32][33][34] studies of the instabilities and dynamics of bilayer thin films so far have been largely limited to aqueous and polymer systems under isothermal conditions. Non-isothermal dewetting even in such more conventional systems has not been fully investigated theoretically.…”

Section: Introductionmentioning

confidence: 99%

Controlling Nanoparticles Formation in Molten Metallic Bilayers by Pulsed-Laser Interference Heating

Khenner

Yadavali

Kalyanaraman

2012

Math. Model. Nat. Phenom.

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Abstract. The impacts of the two-beam interference heating on the number of core-shell and embedded nanoparticles and on nanostructure coarsening are studied numerically based on the non-linear dynamical model for dewetting of the pulsed-laser irradiated, thin (< 20 nm) metallic bilayers. The model incorporates thermocapillary forces and disjoining pressures, and assumes dewetting from the optically transparent substrate atop of the reflective support layer, which results in the complicated dependence of light reflectivity and absorption on the thicknesses of the layers. Stabilizing thermocapillary effect is due to the local thickness-dependent, steadystate temperature profile in the liquid, which is derived based on the mean substrate temperature estimated from the elaborate thermal model of transient heating and melting/freezing. Linear stability analysis of the model equations set for Ag/Co bilayer predicts the dewetting length scales in the qualitative agreement with experiment.

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“…Recent experiments (Lambooy et al 1996;Pan et al 1997;Segalman and Green 1999;Higgins and Jones 2000;Wang et al 2001;Kang et al 2003;Wunnicke et al 2003;de Silva et al 2007;Paul et al 2008) reveal that thin polymer bilayers can selforganize into a variety of even more complex mesoscale patterns, which may be useful for the fabrication of textured functional surfaces and in optoelectronics, microelectromechanical systems and sensor applications. For example, instabilities of thin bilayers on chemically patterned substrates not only generate ordered structures on a large-area, but can also produce pattern transfer in the form of both positive and negative replicas of the substrate imprinted on the twin interfaces of the bilayer (LeOpoldes and Damman 2006).…”

Section: Introductionmentioning

confidence: 99%

Self-Organized Micropatterning of Thin Viscous Bilayers Under Microgravity

Bandyopadhyay

Sharma

Joo

et al. 2010

Microgravity Sci. Technol.

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Self-organized ordered microstructure formation under the action of van der Waals forces is studied in thin (<100 nm) viscous bilayers through nonlinear simulations. For ultra-thin (<100 nm) films, intermolecular forces dominate over the other body forces, thus simulating microgravity conditions needed for fabrication of non-distorted ordered patterns. In particular, we concentrate upon a special type of bilayer in which only the lower layer is unstable and the upper layer is unconditionally stable to fabricate embedded microstructures. The patterns on the films are fabricated by employing either a topographically or chemically patterned solid substrate to control the spatial strength of the intermolecular force. The conditions are identified to fabricate a number of interesting interfacial morphologies such as: (a) embedded microchannels of herringbone shape, (b) encapsulated and embedded droplets of spatially varying shape, and (c) perforated membranes. Our study shows that this methodology can not only lead to ordered patterns, but is also capable of pattern replication because the patterns formed at the embedded liquid-liquid interface are also transferred to the free and stable liquid-air interface.

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Dewetting at a Polymer−Polymer Interface: Film Thickness Dependence

Cited by 85 publications

References 18 publications

Stability and structure evolution in PMMA/SAN bilayer films upon solvent annealing

Stability and structure evolution in PMMA/SAN bilayer films upon solvent annealing

Controlling Nanoparticles Formation in Molten Metallic Bilayers by Pulsed-Laser Interference Heating

Self-Organized Micropatterning of Thin Viscous Bilayers Under Microgravity

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