Deposition of polymer films by spin casting: A quantitative analysis

Danglad‐Flores, José; Eickelmann, Stephan; Riegler, Hans

doi:10.1016/j.ces.2018.01.012

Cited by 68 publications

(74 citation statements)

References 39 publications

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“…The solute concentration remains approximately c 0 , the weighing in concentration. This is a reasonable assumption, as Karpitschka et al 1 and Danglad-Flores et al 2 have shown. Later, as soon as the film is thinner than h tr , film thinning is due to evaporation only.…”

Section: Introductionmentioning

confidence: 75%

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Controlled Deposition of Nanosize and Microsize Particles by Spin-Casting

et al. 2019

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The deposition of nanosize and microsize spherical particles on planar solid substrates by hydrodynamic-evaporative spin-casting is studied. The particles are dispersed in a volatile liquid, which evaporates during the process, and the particles are finally deposited on the substrate. Their coverage, Γ, depends on the processing parameters (concentration by weight, particles size, etc.). The behavior of the particles during the spin-casting process and their final Γ values are investigated. It is found that for up to particle diameters of a few micrometers, particle deposition can be described by a theoretical approach developed for the spin-casting of polymer solutions (Karpitschka, S.; Weber, C. M.; Riegler, H. Chem. Eng. Sci. 2015 , 129 , 243–248. Danglad-Flores, J.; Eickelmann, S.; Riegler, H. Chem. Eng. Sci. 2018 , 179 , 257–264). For large particles, this basic theory fails. The causes of this failure are analyzed, and a corrected, more general theoretical approach is presented. It takes into account particle size effects as well as particle sedimentation. In summary, we present new insights into the spin-cast process of particle dispersions, analyze the contributions affecting the final particle coverage, and present a theoretical approach which describes and explains the experimental findings.

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Section: Introductionmentioning

confidence: 75%

“…It should also be noted that E depends on the rotational speed, ω. 2,17,22,25 K and E can be combined into a single parameter, namely h tr , the transition height, which universally characterizes the hydrodynamic–evaporative spin-cast film-thinning process. 1 h tr has an explicit physical meaning.…”

Section: Introductionmentioning

confidence: 99%

Controlled Deposition of Nanosize and Microsize Particles by Spin-Casting

et al. 2019

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“…A spin‐coating (spin‐casting) device is a versatile and easy‐to‐use setup to create thin and homogeneous films on planar supports . In our case, a donor slide consists of a glass slide, covered with polyimide tape, which is spin‐coated with a polymer matrix material, embedding the building blocks.…”

Section: Resultsmentioning

confidence: 99%

“…The materials and the spin‐coating parameters were chosen according to ref. to achieve donor film thicknesses between 200 and 500 nm.…”

Section: Methodsmentioning

confidence: 99%

A Low‐Cost Laser‐Based Nano‐3D Polymer Printer for Rapid Surface Patterning and Chemical Synthesis of Peptide and Glycan Microarrays

Eickelmann

Tsouka

Heidepriem

et al. 2019

Adv Materials Technologies

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A low‐cost laser‐based printing setup is presented, which allows for the spot‐wise patterning of surfaces with defined polymer nanolayers. These nanolayer spots serve as a “solid solvent,” embedding different chemicals, chemical building blocks, materials, or precursors and can be stacked on top of each other. By melting the spot pattern, the polymer‐embedded molecules are released for chemical reaction. This enables researchers to quickly pattern a surface with different molecules and materials, mixing them directly on the surface for high‐throughput chemical synthesis to generate and screen diverse microarray libraries. In contrast to expensive ink‐jet or contact printing, this approach does not require premixing of inks, which enables in situ combinatorial mixing. Easy access and versatility of this patterning approach are shown by generating microarrays of various biomolecules, such as glycans for the first time, to screen interactions of antibodies and lectins. In addition, a layer‐by‐layer solid‐phase synthesis of peptides directly on the microarray is presented. Amino acid–containing nanolayers are repeatedly laser‐transferred and reacted with the functionalized acceptor surface in defined patterns. This simple system enables a reproducible array production, down to spot‐to‐spot distances of 100 µm, and offers a flexible and cheap alternative to expensive spotting robot technology.

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“…43 With this method also permanent planar films or permanent coverages of NPs can be prepared in a well-controlled way by deposition of liquid mixtures of volatile and nonvolatile components. 44 Reflection optical microscopy setup.- Figure 1 shows the experimental setup to optically de-termine on-line and locally (within lateral optical resolution) the (time-dependent) thickness of the liquid film during the spin cast process. It allows to determine the local, time-dependent liquid film thickness and the location of individual NPs.…”

Section: Methodsmentioning

confidence: 99%

Meniscus Shape around Nanoparticles Embedded in Molecularly Thin Liquid Films

et al. 2018

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Individual nanoparticles embedded in molecularly thin films at planar substrates and the resulting film surface distortion (meniscus) adjacent to the nanoparticles are investigated by conventional optical reflection microscopy. Even for nanoparticles much smaller than the Rayleigh diffraction limit, the meniscus creates such a pronounced optical footprint that the location of the nanoparticles can be identified. This is because the decay length (lateral extension) of the meniscus exceeds the size of the nanoparticle by orders of magnitude. Therefore, for the first time, the exact shape of the meniscus of the liquid adjacent to a nanosize object could be measured and analyzed. The meniscus has a zero curvature shape (cosine hyperbolic). The liquid in the meniscus is in pressure equilibrium with the far-field planar film. The decay length decreases with the decreasing nanoparticle size. However, it is independent of the far-field film thickness. Supposedly, the decay length is determined by van der Waals interactions although it is unknown what determines its (unexpectedly large) absolute value. The presented technical approach may be used to investigate biological systems (for instance, surface distortions in supported membranes caused by proteins or protein aggregates).

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Deposition of polymer films by spin casting: A quantitative analysis

Cited by 68 publications

References 39 publications

Controlled Deposition of Nanosize and Microsize Particles by Spin-Casting

Controlled Deposition of Nanosize and Microsize Particles by Spin-Casting

A Low‐Cost Laser‐Based Nano‐3D Polymer Printer for Rapid Surface Patterning and Chemical Synthesis of Peptide and Glycan Microarrays

Meniscus Shape around Nanoparticles Embedded in Molecularly Thin Liquid Films

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