2 research outputs found
Supplementary Material: Supporting analytical data from Better together: synergy in nanocellulose blends
TEM image TEMPO CNF, results of Mw determination of (r-)BC and conductometric titration, FT-IR spectra of pulp and TEMPO-CNF, all single results of BC nanopaper tensile tests and a schemactic of freacture toughness samples as well as a photograph of actual samples
Transparent PDMS Surfaces with Covalently Attached Lubricants for Enhanced Anti-adhesion Performance
Liquid-like surfaces
featuring slippery, omniphobic, covalently
attached liquids (SOCALs) reduce unwanted adhesion by providing a
molecularly smooth and slippery surface arising from the high mobility
of the liquid chains. Such SOCALs are commonly prepared on hard substrates,
such as glass, wafers, or metal oxides, despite the importance of
nonpolar elastomeric substrates, such as polydimethylsiloxane (PDMS) in anti-fouling or nonstick applications. Compared to
polar elastomers, hydrophobic PDMS elastomer activation
and covalent functionalization are significantly more challenging,
as PDMS tends to display fast hydrophobic recovery upon
activation as well as superficial cracking. Through the extraction
of excess PDMS oligomers and fine-tuning of plasma activation
parameters, homogeneously functionalized PDMS with fluorinated
polysiloxane brushes could be obtained while at the same time reducing
crack formation. Polymer brush mobility was increased through the
addition of a smaller molecular silane linker to exhibit enhanced
dewetting properties and reduced substrate swelling compared to functionalizations
featuring hydrocarbon functionalities. Linear polymer brushes were
verified by thermogravimetric analysis. The optical properties of PDMS remained unaffected by the activation in high-frequency
plasma but were impacted by low-frequency plasma. Drastic decreases
in solid adhesion of not just complex contaminants but even ice could
be shown in horizontal push tests, demonstrating the potential of
SOCAL-functionalized PDMS surfaces for improved nonstick
applications