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Physicochemical characterization of nonionic surfactants in oil-in-water (O/W) nano-emulsions for new pesticide formulations


Lim, Chaw Jiang and Basri, Mahiran and Omar, Dzolkhifli and Abdul Rahman, Mohd Basyaruddin and Salleh, Abu Bakar and Raja Abdul Rahman, Raja Noor Zaliha (2011) Physicochemical characterization of nonionic surfactants in oil-in-water (O/W) nano-emulsions for new pesticide formulations. International Journal of Applied Science and Technology, 1 (5). pp. 131-142. ISSN 2221-0997; ESSN: 2221-1004


Physicochemical characteristics of pre-formulation concentrates of an emulsion system of LFAMEs/APG: organosilicone/water were determined. The surfactants used were octyl/decyl polyglucosides (short-chain APG; SAPG) and dodecyl/tetradecyl/hexadecyl polyglucosides (long-chain APG; LAPG). Alkyl chain length of the APG was found to dominate the different flow behaviours of emulsions. The SAPG-emulsions exhibited Newtonian behaviour with constant viscosity, while LAPG-emulsions showed non-Newtonian behaviour with reduced viscosity. The morphology study showed larger size assembly of irregular aggregates for LAPG-emulsions as compared to SAPG-emulsions. The presence of glyphosate IPA in SAPG/LAPG emulsions formed polymerized multi-connected network structure, with the network being more densely packed in the LAPG-emulsions than SAPG-emulsions. Glyphosate IPA was found to reduce shear thinning on LAPG-emulsions while no effect was observed on SAPG-emulsions. Upon dilution of the pre-formulation concentrates, nano-formulations were formed. In SAPG-emulsion system, particles size was smaller, more uniformly dispersed and surface tension was lower than in LAPG-emulsion system.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
Institute of Bioscience
Faculty of Agriculture
Faculty of Biotechnology and Biomolecular Sciences
Publisher: Center of Promoting Ideas
Keywords: Rheology; Shear thinning; Alkylpolygluco sides, Glyphosate IPA; Nano-emulsions
Depositing User: Nurul Ainie Mokhtar
Date Deposited: 01 Sep 2015 01:56
Last Modified: 28 Sep 2016 02:25
URI: http://psasir.upm.edu.my/id/eprint/22316
Statistic Details: View Download Statistic

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