工程化防污微地形——特征尺寸、几何形状和粗糙度对绿藻石莼游动孢子沉降的影响

Engineered antifouling microtopographies - effect of feature size, geometry, and roughness on settlement of zoospores of the green alga Ulva.

作者信息

Schumacher James F, Carman Michelle L, Estes Thomas G, Feinberg Adam W, Wilson Leslie H, Callow Maureen E, Callow James A, Finlay John A, Brennan Anthony B

机构信息

J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL 32611-6400, USA.

出版信息

Biofouling. 2007;23(1-2):55-62. doi: 10.1080/08927010601136957.

DOI:10.1080/08927010601136957

PMID:17453729

Abstract

The effect of feature size, geometry, and roughness on the settlement of zoospores of the ship fouling alga Ulva was evaluated using engineered microtopographies in polydimethylsiloxane elastomer. The topographies studied were designed at a feature spacing of 2 microm and all significantly reduced spore settlement compared to a smooth surface. An indirect correlation between spore settlement and a newly described engineered roughness index (ERI) was identified. ERI is a dimensionless ratio based on Wenzel's roughness factor, depressed surface fraction, and the degree of freedom of spore movement. Uniform surfaces of either 2 mum diameter circular pillars (ERI=5.0) or 2 microm wide ridges (ERI=6.1) reduced settlement by 36% and 31%, respectively. A novel multi-feature topography consisting of 2 mum diameter circular pillars and 10 microm equilateral triangles (ERI=8.7) reduced spore settlement by 58%. The largest reduction in spore settlement, 77%, was obtained with the Sharklet AF topography (ERI=9.5).

摘要

利用聚二甲基硅氧烷弹性体中的工程微地形，评估了特征尺寸、几何形状和粗糙度对船舶污损藻类石莼游动孢子沉降的影响。所研究的地形设计特征间距为2微米，与光滑表面相比，所有地形均显著减少了孢子沉降。确定了孢子沉降与新描述的工程粗糙度指数（ERI）之间的间接相关性。ERI是基于温泽尔粗糙度因子、凹陷表面分数和孢子运动自由度的无量纲比率。直径2微米的圆形柱体（ERI = 5.0）或2微米宽的脊（ERI = 6.1）的均匀表面分别使沉降减少了36%和31%。由直径2微米的圆形柱体和10微米等边三角形组成的新型多特征地形（ERI = 8.7）使孢子沉降减少了58%。使用鲨鱼皮AF地形（ERI = 9.5）时，孢子沉降减少幅度最大，为77%。