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CALCULATION OF THE YOUNG'S MODULUS OF AN ADSORBED POLYMER LAYER

Chinese Journal of Polymer Science 2007年第1期25卷 95-105页

作者： Rüdiger Stark michael kappl Hans-Jürgen Butt Max-Planck-Institute for Polymer Research Ackermannweg 1055128 MainzGermany

Polymer layers adsorbed to a surface or in a confined environment often change their mechanical properties. There is even the possibility of solidification of the confined layer. To judge the stiffness of such a layer, we used the Hertz model to calculate the Young＇s modulus of the polymer layer in the confinement of AFM experiments with silicon nitride tip with a radius of curvature ofR ≈ 50 nm and a glass sphere attached to the cantilever R =5 μm. Since there is no visible indentation of the layer in the AFM experiments, the layer is either penetrated very easily, or the indentation is too small to be seen in a force curve. The latter would be the case for a polymer layer with a Young＇s modulus above 4 × 10^8 Pa in case of an experiment with a silicon nitride tip and 4×10^5 Pa in case of a glass sphere.

关键词： AFM PDMS PI Confined polymer Young's modulus Solidification.

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Chemically robust superhydrophobic surfaces with a self‐replenishing nanoscale liquid coating

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Droplet 2024年第1期3卷 136-148页

作者： Xiaoteng Zhou Pranav Sudersan Diego Diaz Benjamin Leibauer Chirag Hinduja Fahimeh Darvish Pravash Bista Lukas Hauer Manfred Wagner Werner Steffen Jie Liu michael kappl Hans‐Jürgen Butt Max Planck Institute for Polymer Research MainzGermany Key Laboratory of Green Printing Institute of ChemistryChinese Academy of SciencesBeijingChina School of Chemical Sciences University of Chinese Academy of SciencesBeijingChina

Due to poor chemical robustness,superhydrophobic surfaces become susceptible to failure,especially in a highly oxidative *** ensure the longterm efficacy of these surfaces,a more stable and environmentally friendly coating is required to replace the conventional salinization ***,soottemplated surfaces with re‐entrant nanostructures are precoated with polydimethylsiloxane(PDMS)*** additional nanometer‐thick lubricant layer of PDMS was then applied to increase chemical *** surface is superhydrophobic with a nanoscale liquid *** the lubricant layer is thin,ridge formation is suppressed,which leads to low drop sliding friction and fast drop *** introducing a bottom“reservoir”of a free lubricant as an oil source for self‐replenishing to the upper layer,the superhydrophobic surface becomes more stable and heals spontaneously in response to alkali erosion and O2 plasma *** design also leads to a higher icing delay time and faster removal of impacting cooled water drops than for uncoated surfaces,preventing icing at low temperatures.

关键词： coating friction liquid

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