中文摘要
本實驗室利用懸垂液滴影像測量儀，測量Sodium Dodecyl Sulfate (十二烷基硫酸鈉, SDS)與定濃度poly(2-vinyl pyridine) (聚乙烯砒碇，PVP)混合水溶液(pH = 2)，隨著SDS濃度的改變，其動態與平衡表面張力的變化情形。實驗發現：溶液的平衡張力與SDS濃度的曲線圖有著特殊的行為；當SDS濃度小於8 μM時其平衡張力隨著SDS的濃度增加而下降至35 mN/m；在SDS濃度為8 μM ~ 0.95 mM其張力維持35 mN/m左右，且當SDS濃度大於0.2 mM時，溶液開始出現混濁；當SDS濃度為1.0 mM時，其平衡張力升高至60 mN/m，溶液變澄清但溶液中出現白色沉澱物；SDS濃度為1.5 mM至2.5 mM時溶液再度混濁，其張力約為35 mN/m；SDS濃度大於4.5 mM時為澄清，張力變為略低於35 m/N/m。
濃度為0.85 mM~0.95 mM時，混濁溶液之懸垂液滴的表面動態張力曲線，在為55.5 mN/m有一明顯的張力緩降區存在，推論此可能為SDS/PVP溶液吸附單分子層之兩相共存區。

Abstract
Dynamic and equilibrium surface tensions of mixed PVP/SDS solutions are measured at 25 oC, pH = 2 and fixed PVP concentration (0.01 wt%). A special behavior is observed on the equilibrium surface tension (γ). As CSDS < 8 μM, the equilibrium γ decreases down to 35 mN/m at increasing SDS concentration. The equilibrium γ keeps at 35 mN/m as 8 μM < CSDS < 0.95 mM. As CSDS > 0.2 mM the solutions become turbid. Equilibrium γ rises to 60 mN/m at CSDS > 1.0 mM and the solutions become clear accompanying with some precipitates on glass surface. As 1.5 mM < CSDS < 2.5 mM, the solutions become turbid again and the equilibrium γ decreases again to 35 mN/m. Solutions are clear and transparent at CSDS > 4.5 mM and the equilibrium γ are lower than 35 mN/m.
The dynamic γ profile of the pendant drop of the mixed PVP/SDS solutions shows a plateau region at γ ∼ 55 mN/m for the solution of 0.85 < CSDS < 0.95 mM. This plateau region implies a phase transition or a special surfactant relaxation state at air-water interface during the process.

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