Herein,
a simple hierarchical surface patterning method is presented
by effectively combining buckling instability and azopolymer-based
surface relief grating inscription. In this technique, submicron patterns
are achieved using azopolymers, whereas the microscale patterns are
fabricated by subsequent thermal shrinkage. The wetting characterization
of various topographically patterned surfaces confirms that the method
permits tuning of contact angles and choosing between isotropic and
anisotropic wetting. Altogether, this method allows efficient fabrication
of hierarchical surfaces over several length scales in relatively
large areas, overcoming some limitations of fabricating multiscale
roughness in lithography and also methods of creating merely random
patterns, such as black silicon processing or wet etching of metals.
The demonstrated fine-tuning of the surface patterns may be useful
in optimizing surface-related material properties, such as wetting
and adhesion, producing substrates that are of potential interest
in mechanobiology and tissue engineering.
Ultra-long silver nanowires (AgNWs) with aspect ratio > 2000 were prepared by hydrothermal synthesis method. Influence of reaction time (4-32 hr), reaction temperature (150-180 °C), polyvinylpyrrolidone (PVP) molecular weight (10,000-1,300,000...
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