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界面張力儀與表面張力儀的區(qū)別有哪些？

更新時(shí)間：2025-10-22

點(diǎn)擊次數(shù)：2311

界面張力儀是一種用物理方法代替化學(xué)方法的簡單易行的測試儀器，用它可以迅速、準(zhǔn)確地測出各種液體的表面張力值。在水電部門用來測試電業(yè)用油的表面張力值以加強(qiáng)對絕緣油油質(zhì)的監(jiān)督；在石油化工、科研和教育部門該儀器也得到了廣泛的應(yīng)用。

　　界面張力儀與表面張力儀的區(qū)別，淺顯一點(diǎn)來說，界面可以用來測試表面張力和界面張力值。反之表面張力儀不一定可用于測試界面張力值。

　　這里存在兩個(gè)概念：

　　其一、表面張力通常特指液－氣之間的界面張力值，而界面張力儀中的界面張力通常指液－液界面張力值，有時(shí)也會涉及到液－液－氣（高溫高壓條件下）的界面張力值。因而，表面張力值通常高于16mN/m，而界面張力有時(shí)會低到0.0001mN/m甚至更低。因而，它得要求會比較多，表面張力儀的要求會比較少一些。

　　其二、表面張力測試和界面張力測試所用的技術(shù)差別非常大。表面張力測試通常采用的技術(shù)為白金板法和白金環(huán)法，而界面張力測試除了以上兩種方法外，有效的方法是懸滴法、約束停滴法和旋轉(zhuǎn)滴法等。綜合而言，表面張力儀與界面張力儀存在很大不同。

　　從另一方面來講，表面張力儀通常特指稱重原理的表面張力儀，主要為白金環(huán)法和白金板法的表面張力儀。目前，白金環(huán)法的表面張力儀通常是作為白金板法表面張力儀的附屬配件被銷售。而白金板法的表面張力儀為目前市場的主流。白金板法的表面張力儀目前分為兩類，一種是經(jīng)典的基于零浮力的算法和基于方程修正法的。經(jīng)典白金板法與白金環(huán)法的修正均以零接觸角值為前提條件。但是事實(shí)上，在界面張力測試時(shí)，接觸角的變化范圍非常大，約為29－129度，因而，零接觸角的假設(shè)在此兩種方法是無效的。所以，除基于方程修正法的表面張力儀外，其他方法用于測試界面張力值時(shí)會出現(xiàn)偏低現(xiàn)象。具體可用苯與水的界面張力值作為驗(yàn)證（20度，界面張力值為35mN/m）。

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界面張力儀與表面張力儀的區(qū)別有哪些？

界面張力儀與表面張力儀的區(qū)別有哪些？