Cabbage-like polydimethysiliconalkly(PDMS) films were prepared via a laser cutting method. The as-prepared special “micro-submicro-nano structures” PDMS films have a very low adhesive force to water. The force is merely about 6.5 μN, and appears at the time just before the water droplet leaves the surface. The super-low adhesive force of rough PDMS surface results from the distinct decrease of the real contact area between the surface and water drop. The sliding feature is strongly affected by microstructure of surface. That rough structure induced on the surface of PDMS is due to the thermo-reaction of laser with transparent elastomer. This information is useful for the designing of bio-mimetic hydrophobic surface structure for various applications. These surfaces may provide very effective water-repellent and anti-adhesive properties against particular contamination. Such properties can greatly extend its applications to many other areas such as lost less liquid transportation without loss, and micro-pump(creating pushing-force) needless micro-fluidic devices
The post structure aligned carbon nanotube(ACNT) film was prepared by CVD. it was a ultra-hydrophobic film with a higher contact angle(166°) and lower sliding angle(less than 3°). The post structure ACNT film showed discrete pillar composed of carbon nanotubes, these pillar formed microstructure in the film, which affected both the contact angle and the sliding angle.
We described the appearance of complex, patterned structures induced by the buckling of metal thin films owing to thermal contraction on a polymer substrate. Polystyrene(PS) films with thickness of 100 μm were casted onto a glass substrate, and the Pt thin films with thickness of 30 nm were deposited onto the polymer surface. The sample films were heated above the glass transition temperature of PS. After cooling to ambient temperature, the disordered wrinkles generated over the whole surface. When we ablated the top metal thin film by laser before heating the polymer, the disordered bucking wrinkles would transfer into ordered ridges pattern. This patterning process is arresting and potentially useful to fabricate optical devices such as diffraction gratings and optical sensors.
The authors presented a facile approach to prepare highly-ordered sub-micrometer scaled cylindrical diamond arrays based on a chemical vapor deposition method,where the accurate control of the style of crystal seeds dispersion and the growth time are very crucial.The as-prepared diamond array showed good conductivity which was originated from the proper boron doping,and moreover,it exhibited good field emission property with low turn-on field and high emission current.Importantly,this approach can be easily applied to the preparation of various micro-patterned one-dimensional diamond arrays.
ZHAO Tian-yiLIU Hui-biaoWANG Chun-ruLI Yu-liangLIU HuanJIANG Lei
