Physicochemical characterization of nonionic surfactants in oil-in-water (O/W) nano-emulsions for new pesticide formulations
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...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Center of Promoting Ideas
2011
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| Online Access: | http://psasir.upm.edu.my/id/eprint/22316/1/Physicochemical%20characterization%20of%20nonionic%20surfactants%20in%20oil.pdf http://psasir.upm.edu.my/id/eprint/22316/ http://www.ijastnet.com/journal/index/96:vol-1-no-5-september-2011abstract17&catid=15:abstract |
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| Summary: | 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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