A comparison of spreading behaviors of Silwet L-77 on dry and wet lotus leaves.
Trisiloxane surfactants are widely used in pesticide applications as adjuvants to promote spray drop spreading on leaves. The efficacy of the spray is related to the wetting of plant surfaces. The surface (composite or wetted) formed by the liquid drop instantly contacting with the substrate is vital to the spreading. In this paper the spreading behaviors of surfactant solutions on dry and previous wet lotus leaf surfaces were studied. It was found that the drop spreading on the wet surface was obviously easier than on the dry surface, which was rational to the existence of water in the grooves of the wet surface. The spreading of Silwet L-77 aqueous drops on the wet lotus leaf surface is mainly controlled by the surface tension gradient along the air-liquid interface.
Tang
Xiaolan
X
College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China.
Dong
Jinfeng
J
Li
Xuefeng
X
D057927:Hydrophobic and Hydrophilic Interactions; D000070116:Lotus / Q000737:chemistry / Q000502:physiology*; D017646:Organosilicon Compounds / Q000737:chemistry*; D010575:Pesticides / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry / Q000502:physiology*; D012833:Siloxanes / Q000737:chemistry; D012996:Solutions / Q000737:chemistry*; D013499:Surface Properties; D013500:Surface Tension; D013501:Surface-Active Agents / Q000737:chemistry*; D014867:Water / Q000737:chemistry; D017155:Wettability
D017646:Organosilicon Compounds; D010575:Pesticides; D012833:Siloxanes; D012996:Solutions; D013501:Surface-Active Agents; C473569:silwet L-77; C452281:trisiloxane ethoxylate; D014867:Water