title: Superhydrophobic antireflective silica films: fractal surfaces and laser-induced damage thresholds.
abstract: Several superhydrophobic antireflective silica films have been prepared by a solgel method that uses hexamethyl-disilizane (HMDS) as a modifier. In a high-power laser, laser-induced damage thresholds (LIDTs) of 23-30 J/cm2 were obtained at 1064-nm wavelength with 1-ns pulse duration. By atomic-force microscopy and optical microscopy, the fractal surfaces of films were studied, and multifractal spectra (MFSs) were calculated both before and after laser damage. The two-sided effect of HMDS on particle growth determined the surface fractal of a particle and the multifractal structure of a film's surface. The bigger deltaalpha was, both before and after laser damage, the lower the LIDT was. The effect of methyl groups should be included in the determination of the MFS of the LIDT.
authors.affiliation: State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China. xuyaoc@yahoo.com.cn
authors.forename: Yao
authors.initials: Y
authors.lastname: Xu
authors.forename: Dong
authors.initials: D
authors.lastname: Wu
authors.forename: Yu Han
authors.initials: YH
authors.lastname: Sun
authors.forename: Zu Xing
authors.initials: ZX
authors.lastname: Huang
authors.forename: Xiao Dong
authors.initials: XD
authors.lastname: Jiang
authors.forename: Xiao Feng
authors.initials: XF
authors.lastname: Wei
authors.forename: Zhi Hong
authors.initials: ZH
authors.lastname: Li
authors.forename: Bao Zhong
authors.initials: BZ
authors.lastname: Dong
authors.forename: Zhong Hua
authors.initials: ZH
authors.lastname: Wu