Abstract Using mixed nonionic surfactants Span/Tween, we investigated the effects of HLB value on the O/W emulsion stability and rheological behaviors. In this study, MS-01 (Span 60 & Tween 60) and MS-02 (Span 80 & Tween 80) was used as mixed nonionic surfactants. We considered required HLB value 10.85 and selected corresponding HLB value range 8–13. The droplet size distributions, droplet morphology, rheological properties, zeta-potential and creaming index of the emulsion samples were obtained to understand the mechanism and interaction of droplets in O/W emulsion. The results indicated that optimal HLB number for O/W emulsions was 10.8 and 10.7, while using MS-01 surfactant and MS-02 surfactant respectively. MS-01 (HLB = 10.8) sample and MS-02 (HLB = 10.7) sample showed smallest droplet size and highest zeta-potential value. Rheological properties are measured to understand rheological behaviors of emulsion samples. All emulsion samples showed no phase separation until 30 days storage time at 25 °C.

中文翻译：

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HLB 值对水包油乳液的影响：液滴大小、流变行为、zeta 电位和乳化指数

摘要 使用混合非离子表面活性剂 Span/Tween，我们研究了 HLB 值对 O/W 乳液稳定性和流变行为的影响。在本研究中，MS-01 (Span 60 & Tween 60) 和 MS-02 (Span 80 & Tween 80) 被用作混合非离子表面活性剂。我们考虑了所需的 HLB 值 10.85，并选择了相应的 HLB 值范围 8-13。获得了乳液样品的液滴尺寸分布、液滴形态、流变特性、zeta 电位和乳化指数，以了解液滴在 O/W 乳液中的机理和相互作用。结果表明，O/W 乳液的最佳 HLB 值为 10.8 和 10.7，而分别使用 MS-01 表面活性剂和 MS-02 表面活性剂。MS-01 (HLB = 10.8) 样品和 MS-02 (HLB = 10.7) 样品显示出最小的液滴尺寸和最高的 zeta 电位值。测量流变特性以了解乳液样品的流变行为。所有乳液样品在 25°C 下储存 30 天前均未出现相分离。