Sacrificial mica substrates influence the slip boundary condition of dewetting polymer films

Sabzevari, Seyed Mostafa; McGraw, Joshua D.; Jacobs, Karin; Wood‐Adams, Paula M.

doi:10.1016/j.polymer.2015.08.038

Cited by 3 publications

(3 citation statements)

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“…In addition, it is noteworthy that unlike polymers with long chain molecular structures, BMGs exhibit homogeneous and isotropic structures down to the atomic scale, and their very high viscosity in the SCLR can also rule out the usual nanobubble effect in simple fluids. Upon comparison of the boundary slip measured in this work with reported values in n -alkanes, n -alcohols, a benzene derivative, water, , a sucrose solution, , ring-shaped molecules, silicone oil, hexadecane, , squalene, polydimethylsiloxane, , polyethylene, and polystyrene − (Figure ), the slip length in Pt-BMG supercooled liquids ranges from 50 to 500 nm, larger than those of most fluids and even comparable with the high slip length measured in polymer melts.…”

Section: Resultssupporting

confidence: 76%

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Observation of a Large Slip Effect in the Nanoscale Flow of Highly Viscous Supercooled Liquid Metals

Xiang

Liu

2023

Langmuir

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Understanding and controlling the flow of materials confined in channels play important roles in science and engineering. The general no-slip boundary condition will result in it being more challenging to drive the flow as the channel size decreases to the nanoscale, especially for highly viscous liquids. Here, we report the observation of a large boundary slip in the nanoscale flow of highly viscous supercooled liquid metals (with viscosities of ≲10 8 Pa s), enabled by the hydrophobic treatment of smooth nanochannels. The slip length significantly depends on the pressure, which can be rationalized by the shear-dependent viscosity. Our findings provide not only new insights into the field of nanofluidics but also a practical technique for resolving the challenge in the net formation of highly viscous supercooled liquid metals at the nanoscale.

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Section: Resultssupporting

confidence: 76%

“…Comparison of measured slip length here with other fluid systems, such as n -alkanes, n -alcohols, a benzene derivative, water, , a sucrose solution, , ring-shaped molecules, silicone oil, hexadecane, , squalene, polydimethylsiloxane, , polyethylene, and polystyrene. − …”

Section: Resultsmentioning

confidence: 99%

Observation of a Large Slip Effect in the Nanoscale Flow of Highly Viscous Supercooled Liquid Metals

Xiang

Liu

2023

Langmuir

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“…Thin polymer film can become unstable and spontaneously rupture whenever the intermolecular disjoining pressure increases with increased film thickness [6][7][8][9][10][11][12][13][14][15][16][17] . The dewetting of thin polymer film progresses with the formation and growth of randomly placed holes with a certain mean length scale.…”

Section: Introductionmentioning

confidence: 99%

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

Zhang

Shi

2016

Polymer

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Short chains enhance slip of highly entangled polystyrenes during thin film dewetting

2016

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We investigate the effect of short chains on slip of highly entangled polystyrenes (PS) during thin film dewetting from non-wetting fluorinated surfaces. Binary and ternary mixtures were prepared from monodisperse PS with weight average molecular weights 5 < Mw < 490 kg/mol. Flow dynamics and rim morphology of dewetting holes were captured using optical and atomic force microscopy. Slip properties are assessed in the framework of hydrodynamic models describing the rim height profile of dewetting holes. We show that short chains with Mw below the polymer critical molecular weight for entanglements, Mc, can play an important role in slip of highly entangled polymers. Among mixtures of the same Mw, those containing chains with M < Mc exhibit larger slip lengths as the number average molecular weight, Mn, decreases. The slip enhancement effect is only applicable when chains with M < Mc are mixed with highly entangled chains such that the content of the long chain component, φL, is dominant (φL < 0.5). These results suggest that short chains affect slip of highly entangled polymers on non-wetting surfaces due to the physical or chemical disparities of end groups, and any associated dynamical effect their presence may have, as compared to the backbone units. The enhanced slip in this regard is attributed to the impact of chain end groups or short chain enrichment on the effective interfacial friction coefficient. Accordingly, for entangled PS, a higher concentration of end groups or short chains at the interface results in a lower effective friction coefficient which consequently enhances the slip length.

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Sacrificial mica substrates influence the slip boundary condition of dewetting polymer films

Cited by 3 publications

References 50 publications

Observation of a Large Slip Effect in the Nanoscale Flow of Highly Viscous Supercooled Liquid Metals

Observation of a Large Slip Effect in the Nanoscale Flow of Highly Viscous Supercooled Liquid Metals

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

Short chains enhance slip of highly entangled polystyrenes during thin film dewetting

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