Water Sorption Isotherms of Surfactants: A Tool To Evaluate Humectancy

被引：12

作者：

Asmus, Elisabeth ^{[1
]}

Popp, Christian ^{[2
]}

Friedmann, Adrian A. ^{[3
]}

Arand, Katja ^{[1
]}

Riederer, Markus ^{[1
]}

机构：

[1] Univ Wurzburg, Dept Bot 2, Julius von Sachs Pl 3, DE-97082 Wurzburg, Germany

[2] Syngenta Crop Protect, Global Formulat Technol, Breitenloh 5, CH-4333 Munchwilen, Switzerland

[3] Syngenta Crop Protect AG, Syngenta Crop Protect, Schwarzwaldallee 215, CH-4002 Basel, Switzerland

来源：

JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY | 2016年 / 64卷 / 26期

关键词：

non-ionic surfactants; polysorbates; Tween; oleyl alcohol ethoxylates; water sorption isotherms; humidity; humectant activity; ISOLATED PLANT CUTICLES; MONODISPERSE ALCOHOL ETHOXYLATES; FOLIAR UPTAKE; OCTYLPHENOXY SURFACTANTS; CUTICULAR PENETRATION; ADJUVANTS; MOBILITY; 2,4-D; AGROCHEMICALS; ENHANCEMENT;

D O I：

10.1021/acs.jafc.6b01378

中图分类号：

S [农业科学];

学科分类号：

09 ;

摘要：

Fundamental experimental data for moisture absorption of non-ionic polydisperse surfactants with differing ethylene oxide (EO) content and variable aliphatic portions were measured at relative humidities between 0 and 95% at 25 degrees C. Remarkable differences in moisture absorption were observed between surfactant classes but also within one series of surfactants differing in either EO content or the long-chain aliphatic fraction. Both the EO units as well as the entire molecular structure, including also the lipophilic domain, were discussed to account for the humectant activity of surfactants. Water sorption isotherms showed an exponential shape, which was argued to be associated with the formation of a "free" water domain. These humectant properties might be relevant to the behavior of a foliar-applied spray droplet of agrochemical formulation products because the uptake of active ingredients will be enhanced as a result of deferred crystal precipitation.

引用

页码：5310 / 5316

页数：7

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