Plasma immersion ion implantation(PIII) was used to fabricate micro/nano structures on monocrystalline Si surfaces with different ratios of mixed gases(SF_6/O_2). The micro/nano structures on the surfaces of the sampl...Plasma immersion ion implantation(PIII) was used to fabricate micro/nano structures on monocrystalline Si surfaces with different ratios of mixed gases(SF_6/O_2). The micro/nano structures on the surfaces of the sample were characterized by scanning electron microscopy(SEM) and atomic force microscopy(AFM). The results showed that with increasing ratio of mixed gases(SF_6/O_2), the height of the micro/nano structures first increased and then decreased. Contact-angle measurements indicated that the surfaces' micro/nano structures have an obvious effect on the contact-angle, and could cause a change in surface wettability. The theoretical analysis of contact-angle showed that the Wenzel and Cassie theories cannot predict the contact-angle of a roughened surface accurately, and should be corrected for practical applications using an actual model. Moreover, the contact-angle first increased and then decreased with increasing ratio of mixed gases(SF_6/O_2), which is in accordance with the change of the height of micro/nano structures.展开更多
A thermodynamic method is employed to analyse the slip length of hydrophobic nanopatterned surface. The maximal slip lengths with respect to the hydrophobicity of the nanopatterned surface are computed. It is found th...A thermodynamic method is employed to analyse the slip length of hydrophobic nanopatterned surface. The maximal slip lengths with respect to the hydrophobicity of the nanopatterned surface are computed. It is found that the slip length reaches more than 50 μm if the nanopatterned surfaces have a contact angle larger than 160°. Such results are expected to find extensive applications in micro-channels and helpful to understand recent experimental observations of the slippage of nanopatterned surfaces.展开更多
基金financially supported by NSFC Project(Grant No.51376022)
文摘Plasma immersion ion implantation(PIII) was used to fabricate micro/nano structures on monocrystalline Si surfaces with different ratios of mixed gases(SF_6/O_2). The micro/nano structures on the surfaces of the sample were characterized by scanning electron microscopy(SEM) and atomic force microscopy(AFM). The results showed that with increasing ratio of mixed gases(SF_6/O_2), the height of the micro/nano structures first increased and then decreased. Contact-angle measurements indicated that the surfaces' micro/nano structures have an obvious effect on the contact-angle, and could cause a change in surface wettability. The theoretical analysis of contact-angle showed that the Wenzel and Cassie theories cannot predict the contact-angle of a roughened surface accurately, and should be corrected for practical applications using an actual model. Moreover, the contact-angle first increased and then decreased with increasing ratio of mixed gases(SF_6/O_2), which is in accordance with the change of the height of micro/nano structures.
基金Supported by the 100 Persons Project of the Chinese Academy of Sciences, the National Natural Science Foundation of China under Grant Nos 10474109 and 10674146, the National Basic Research Programme of China under Grant Nos 2006CB933000 and 2006CB708612. To whom correspondence should be addressed.
文摘A thermodynamic method is employed to analyse the slip length of hydrophobic nanopatterned surface. The maximal slip lengths with respect to the hydrophobicity of the nanopatterned surface are computed. It is found that the slip length reaches more than 50 μm if the nanopatterned surfaces have a contact angle larger than 160°. Such results are expected to find extensive applications in micro-channels and helpful to understand recent experimental observations of the slippage of nanopatterned surfaces.
