以動態表面張力及接觸角變化評估展著劑之功效

Functional evaluation of spreaders by dynamic surface tension and contact angle

為評估植物保護藥劑添加展著劑之功能與效果，分別測試八種登記使用方法之藥劑及展著劑（代號：A1~A8），在使用稀釋倍數下，分別比較添加展著劑與否，藥液之動態表面張力及接觸角變化，結果顯示兩種測定之結果相當一致，添加A8並無潤濕、展佈或滲透效果，而動態表面張力降低之幅度與速度越大，顯示噴液霧化及迅速附著葉面、潤濕之效果越好，本研究結果以A3最好、其次依序為：A6、A7、A1、A5、A2及A4；接觸角降低之程度與速度，可代表液滴附著葉面後之入滲及自動擴展能力，其促進之效果依序為：A6、A3、A7、A5、A4、A2及A1。

"The functions of 8 commercial spreaders were evaluated. Dynamic surface tension and the contact angle of 8 pesticide spray solutions were determined both with and without the spreader under field trials. Results of both dynamic surface tension and contact angle measurement show that 1 of the spreaders, A8, was functionless when applied at the recommended concentration. Based on the reduction in the dynamic surface tension, the ability of spreaders to nebulize a spray solution and improve the wettability and adhesion of droplets onto leaf surfaces can be predicted. The spreading and infiltration ability of droplets on target surfaces can also be estimated by contact angle observations."