Liquid–liquid interfacial slip induced layer instability in a thin polymer bilayer

Xu, Lin; Zhang, Huanhuan; Shi, Tongfei

doi:10.1016/j.polymer.2016.06.011

Cited by 8 publications

(9 citation statements)

References 58 publications

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“…4a). In the case of bilayer system, the Gibbs free energy (Δ G ) for the upper layer and the under layer are given by49505152:…”

Section: Resultsmentioning

confidence: 99%

Enhanced Self-Organized Dewetting of Ultrathin Polymer Blend Film for Large-Area Fabrication of SERS Substrate

Zhang

et al. 2016

Sci Rep

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We study the enhanced dewetting of ultrathin Polystyrene (PS)/Poly (methyl methacrylate) (PMMA) blend films in a mixed solution, and reveal the dewetting can act as a simple and effective method to fabricate large-area surface-enhanced Raman scattering (SERS) substrate. A bilayer structure consisting of under PMMA layer and upper PS layer forms due to vertical phase separation of immiscible PS/PMMA during the spin-coating process. The thicker layer of the bilayer structure dominates the dewetting structures of PS/PMMA blend films. The diameter and diameter distribution of droplets, and the average separation spacing between the droplets can be precisely controlled via the change of blend ratio and film thickness. The dewetting structure of 8 nm PS/PMMA (1:1 wt%) blend film is proved to successfully fabricate large-area (3.5 cm × 3.5 cm) universal SERS substrate via deposited a silver layer on the dewetting structure. The SERS substrate shows good SERS-signal reproducibility (RSD < 7.2%) and high enhancement factor (2.5 × 107). The enhanced dewetting of polymer blend films broadens the application of dewetting of polymer films, especially in the nanotechnology, and may open a new approach for the fabrication of large-area SERS substrate to promote the application of SERS substrate in the rapid sensitive detection of trace molecules.

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“…4a). In the case of bilayer system, the Gibbs free energy (Δ G ) for the upper layer and the under layer are given by49505152:…”

Section: Resultsmentioning

confidence: 99%

Enhanced Self-Organized Dewetting of Ultrathin Polymer Blend Film for Large-Area Fabrication of SERS Substrate

Zhang

et al. 2016

Sci Rep

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“…The viscosity of the polymer has significant effects on the time required for generating patterned structures, which can vary from seconds to weeks depending on its value . It has been recently found that for high molecular weight polymeric bilayers polymethylmethacrylate (PMMA)/PS/solid substrate, the viscosity contrast between two layers induces instability in the electric field thus leading to uneven patterning process …”

Section: Surface Modification Through Patterningmentioning

confidence: 99%

Surface Modification of Polymers: Methods and Applications

Nemani

Annavarapu

Mohammadian

et al. 2018

Adv Materials Inter

253

161

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Low cost, controlled crystallinity, chemical, and mechanical stability enable application of polymers in energy, water, electronics, and biomedical industries. Recent studies have shown that tailoring surface properties of polymers impacts their durability and functionality in these applications. However, the functionality and performance of polymer‐based devices and systems are greatly affected by the modification method and the process parameters, highlighting the need for understanding these methods and their mechanisms of operation in detail. The selection of the modification method invariably decides the properties enhanced in the polymer. In this review, various polymer surface modification treatments are discussed. These methods are categorized into physical, chemical, thermal, and optical ways, while illustrating their advantages and disadvantages. This review also explores the surface modification of polymers by patterning which encompasses one or more surface treatment methods. An application‐oriented study is presented discussing the relative importance of a method pertaining to a specific field of end‐application.

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“…Our experimental results show that the kinetic forces play an important role in the instability pathway of the polymer bilayer. Previous papers 42,43 have reported that the strength of the intermolecular interactions can be redistributed in the bilayer due to the kinetic forces, and the interfacial slip effect can greatly inuence the instability mode of thin polymer bilayer. From our above experimental results, it is found that both kinetic and thermodynamic forces can inuence the spatiotemporal evolution of the thin polymer bilayer.…”

Section: 46mentioning

confidence: 99%

“…Bandyopadhyay et al 36 have shown that a marked decrease in the viscosity of the upper layer increases the rate of deformation of the upper interface, causing the instability shiing back to the upper interface. Our previous paper 43 has reported that the interfacial slip effect can greatly inuence the instability mode of the thin polymer bilayer. Although the kinetically and thermodynamically controlled bilayer dewetting processes have been widely investigated, there are still many intriguing open questions.…”

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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Liquid–liquid interfacial slip induced layer instability in a thin polymer bilayer

Cited by 8 publications

References 58 publications

Enhanced Self-Organized Dewetting of Ultrathin Polymer Blend Film for Large-Area Fabrication of SERS Substrate

Enhanced Self-Organized Dewetting of Ultrathin Polymer Blend Film for Large-Area Fabrication of SERS Substrate

Surface Modification of Polymers: Methods and Applications

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

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