Time-Resolved Light Scattering Studies of Phase Separation in Thin Film Semiconducting Polymer Blends during Spin-Coating

Jukes, Paul C.; Heriot, Sasha Y.; Sharp, James S.; Jones, Richard

doi:10.1021/ma0477145

Cited by 79 publications

(82 citation statements)

References 20 publications

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“…Although phase separation during spin casting is a dynamic nonequilibrium process surprisingly little of the experimental research into spin casting has been done in situ. Previous in situ studies done by our research group have shown that by utilising a combination of specular reflectivity and off-specular scattering it is possible to follow the evolution of the phase separation during the spin casting process [15,16]. The aim of this work was to examine the complex morphologies that result from spin casting PS-PMMA solutions under different experimental conditions and to elucidate the mechanisms that control the phase separation.…”

Section: Introductionmentioning

confidence: 99%

A solution concentration dependent transition from self-stratification to lateral phase separation in spin-cast PS:d-PMMA thin films

et al. 2010

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Section: Introductionmentioning

confidence: 99%

A solution concentration dependent transition from self-stratification to lateral phase separation in spin-cast PS:d-PMMA thin films

et al. 2010

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“…Our finding indicates that the mean-field approximation breaks down under conditions where evaporation-induced stratification is absent [16,21,25], which arguably takes place under conditions of slow evaporation if a high-boiling-point cosolvent is added to the solution [17][18][19]. This failure of the mean-field theory potentially explains the experimental observation of liquid-solid phase-separated morphologies under those conditions [17][18][19].…”

mentioning

confidence: 76%

“…As an alternative approach, we propose to seek this crossover under conditions where phenomenological models to describe L-L demixing break down. We identify such conditions for the case where the concentration increases uniformly, i.e., in the absence of stratified concentration profiles [16,20,21,[25][26][27]. For these conditions, we expose the failure of phenomenological models by finding a rather strong dependence of the length scale of the phase-separated domains on the quench rate.…”

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confidence: 99%

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Structuring of Fluid Adlayers upon Ongoing Unimolecular Adsorption

Schaefer

2018

Phys. Rev. Lett.

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Fluids with spatial density variations of single or mixed molecules play a key role in biophysics, soft matter and materials science. The fluid structures usually form via spinodal decomposition or nucleation following an instantaneous destabilisation of the initially disordered fluid. However, in practice an instantaneous quench is often not viable, and the rate of destabilisation may be gradual rather than instantaneous. In this work we show that the commonly used phenomenological descriptions of fluid structuring are inadequate under these conditions. We come to that conclusion in the context of surface catalysis, where we employ kinetic Monte Carlo simulations to describe the unimolecular adsorption of gaseous molecules onto a metal surface. The adsorbates diffuse at the surface and, as a consequence of lateral interactions and due to an ongoing increase of the surface coverage, phase separate into coexisting low-and high-density regions. The typical size of these regions turns out to depend much more strongly on the rate of adsorption than predicted from recently reported phenomenological models. We discuss how this finding contributes to the fundamental understanding of the crossover from liquid-liquid to liquid-solid demixing of solutioncast polymer blends.

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“…Applications of interfacial convection are *Corresponding author (email: jdwang@mail.tsinghua.edu.cn) numerous, especially in chemical engineering and material processing [20]. In recent years, interfacial convection in the presence of solvent evaporation has been the subject of increasing investigation because of its important role in thin-polymer-film engineering during the drying process [21]. A few applications of interfacial convection in surface micro-structure fabrication have been reported in the literature.…”

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confidence: 99%

Fabrication of a micro-structured surface based on interfacial convection for drag reduction

et al. 2011

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Based on interfacial convection in the presence of solvent evaporation, a novel method for the fabrication of a micro-structured surface is proposed to facilitate drag reduction. A mixture was coated on a substrate through a specially developed spray-painting system. Micron scale pits formed spontaneously in the coated surface because of interfacial convection and deformation driven by the gradient of the interfacial tension. Experimental results indicated that particles in the mixture played a crucial role in pit formation, and with a suitable selection of particle size and dosage, the characteristic parameters of the pitting could be controlled. The drag reduction experiments were first performed in a water tunnel, and the results showed that the micro-structured surface had a remarkable drag reduction performance over a great range of flow speeds. micro-structured surface, particle, pit, interfacial convection, drag reduction Citation:Dou Z L, Wang J D, Yu F, et al. Fabrication of a micro-structured surface based on interfacial convection for drag reduction.

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Time-Resolved Light Scattering Studies of Phase Separation in Thin Film Semiconducting Polymer Blends during Spin-Coating

Cited by 79 publications

References 20 publications

A solution concentration dependent transition from self-stratification to lateral phase separation in spin-cast PS:d-PMMA thin films

A solution concentration dependent transition from self-stratification to lateral phase separation in spin-cast PS:d-PMMA thin films

Structuring of Fluid Adlayers upon Ongoing Unimolecular Adsorption

Fabrication of a micro-structured surface based on interfacial convection for drag reduction

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