Provider: Ingenta Connect Database: Ingenta Connect Content: application/x-research-info-systems TY - ABST AU - Wanyika, Harrison AU - Gatebe, Erastus AU - Kioni, Paul AU - Tang, Zhiyong AU - Gao, Yan TI - Mesoporous Silica Nanoparticles Carrier for Urea: Potential Applications in Agrochemical Delivery Systems JO - Journal of Nanoscience and Nanotechnology PY - 2012-03-01T00:00:00/// VL - 12 IS - 3 SP - 2221 EP - 2228 N2 - Nanotechnology-based agrochemical delivery systems would ensure efficient and economical utilization of these very important agricultural inputs. In this study, mesoporous silica nanoparticles with particle diameters of ∼150 nm and pore sizes of ∼2.5 nm were synthesized via liquid crystal templating mechanism. Urea, as a model agrochemical molecule, was entrapped in the mesopores of the siliceous material by simple immersion loading using aqueous urea solutions. About 15.5% (w/w) of urea was loaded inside the pores mainly by physisorption while the total adsorption capacity of mesoporous silica nanoparticles could reach up to 80% (w/w). Highly concentrated urea solution was found to be more effective due to high driving concentration gradient generated. Release process of the urea-loaded mesoporous silica nanoparticles in water and soil indicated a two stage sustained slow release-profile. The findings for soil release studies revealed at least fivefold improvement in the release period. By the ability to entrap urea guest molecules into its mesopores and release them in a controlled manner, mesoporous silica nanoparticles demonstrated its great potential as a nanocarrier for agrochemicals. UR - https://www.ingentaconnect.com/content/asp/jnn/2012/00000012/00000003/art00068 M3 - doi:10.1166/jnn.2012.5801 UR - https://doi.org/10.1166/jnn.2012.5801 ER -