The Dewetting Properties of Lotus Leaves

doi:10.1021/la8024233

CORC > 化学研究所 > 中国科学院化学研究所

	The Dewetting Properties of Lotus Leaves
	Zhang, Jihua 1; Sheng, Xianliang 2; Jiang, Lei 1,3
刊名	LANGMUIR
	2009-02-03
卷号	25 期号:3 页码:1371-1376
ISSN号	0743-7463
DOI	10.1021/la8024233
英文摘要	The high dewetting abilities of lotus leaves can be transited to a complete wetting state by soaking the leaves in water at a depth of 50 cm for 2 h. However, after being dried by N(2) gas, the high dewetting behavior of lotus leaves may be mostly restored. This indicates that experimental procedure might considerably affect the dewetting abilities of lotus leaves. To discover the mechanism underlying this interesting dewetting phenomena, the dewetting force was used to characterize the dewetting abilities of surfaces, and model studies to mimic the papillae were done. Surface hydrophobicity, sizes, rise angles, and secondary structures of the models' sides affected their dewetting force with water. So we suggested that the dewetting states, Cassie or Wenzel's state, of lotus surfaces depend much on the depth of water, i.e., the hydraulic pressure. On the other hand, the primary structures of papillae in Cassie's state led to a high receding angle with respect to the plane of the leaf during the dewetting measurement. The secondary structures and micro/nano arrays of papillae increased the dewetting abilities of lotus leaves, since no water intruded between papillae. However, the structures of papillae in Wenzle's state significantly reduced the dewetting abilities of lotus leaves after being soaked at a depth of 50 cm for 2 h. Therefore, as for novel designs of microdevices floating on water, including the use of the high dewetting properties of suphydrophobic materials, surface (primary or secondary) microstructure and external pressure, such as static hydraulic pressure, must be taken into account.
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000262827400019
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/66883]
专题	中国科学院化学研究所
通讯作者	Zhang, Jihua
作者单位	1.Aerosp Res Inst Mat & Proc Technol, Beijing 100076, Peoples R China 2.Inner Mongolia Agr Univ, Coll Sci, Hohhot 010018, Peoples R China 3.Chinese Acad Sci, Inst Chem, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Jihua,Sheng, Xianliang,Jiang, Lei. The Dewetting Properties of Lotus Leaves[J]. LANGMUIR,2009,25(3):1371-1376.
APA	Zhang, Jihua,Sheng, Xianliang,&Jiang, Lei.(2009).The Dewetting Properties of Lotus Leaves.LANGMUIR,25(3),1371-1376.
MLA	Zhang, Jihua,et al."The Dewetting Properties of Lotus Leaves".LANGMUIR 25.3(2009):1371-1376.