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Urea-Hydroxyapatite Nanohybrids for Slow Release of Nitrogen

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dc.contributor.author Kottegoda, N.
dc.contributor.author Sandaruwan, C.
dc.contributor.author Priyadarshana, G.
dc.contributor.author Siriwardhana, A.
dc.contributor.author Rathnayake, U.A.
dc.contributor.author Arachchige, D.M.B.
dc.contributor.author Kumarasinghe, A.R.
dc.contributor.author Dahanayake, D.
dc.contributor.author Karunaratne, V.
dc.contributor.author Amaratunga, G.A.J.
dc.date.accessioned 2018-11-23T06:10:22Z
dc.date.available 2018-11-23T06:10:22Z
dc.date.issued 2017-01-25
dc.identifier.citation Kottegoda, N. et al., (2017). "Urea-Hydroxyapatite Nanohybrids for Slow Release of Nitrogen", American Chemical Society Nano, Vol.11 (2), pp. 1214-1221 en_US
dc.identifier.issn 1214–1221
dc.identifier.uri http://dr.lib.sjp.ac.lk/handle/123456789/7599
dc.description.abstract While slow release of chemicals has been widely applied for drug delivery, little work has been done on using this general nanotechnology-based principle for delivering nutrients to crops. In developing countries, the cost of fertilizers can be significant and is often the limiting factor for food supply. Thus, it is important to develop technologies that minimize the cost of fertilizers through efficient and targeted delivery. Urea is a rich source of nitrogen and therefore a commonly used fertilizer. We focus our work on the synthesis of environmentally benign nanoparticles carrying urea as the crop nutrient that can be released in a programmed manner for use as a nanofertilizer. In this study, the high solubility of urea molecules has been reduced by incorporating it into a matrix of hydroxyapatite nanoparticles. Hydroxyapatite nanoparticles have been selected due to their excellent biocompatibility while acting as a rich phosphorus source. In addition, the high surface area offered by nanoparticles allows binding of a large amount of urea molecules. The method reported here is simple and scalable, allowing the synthesis of a urea-modified hydroxyapatite nanohybrid as fertilizer having a ratio of urea to hydroxyapatite of 6:1 by weight. Specifically, a nanohybrid suspension was synthesized by in situ coating of hydroxyapatite with urea at the nanoscale. In addition to the stabilization imparted due to the high surface area to volume ratio of the nanoparticles, supplementary stabilization leading to high loading of urea was provided by flash drying the suspension to obtain a solid nanohybrid. This nanohybrid with a nitrogen weight of 40% provides a platform for its slow release. Its potential application in agriculture to maintain yield and reduce the amount of urea used is demonstrated. en_US
dc.language.iso en en_US
dc.publisher 2017 American Chemical Society en_US
dc.subject urea-modified hydroxyapatite nanohybrid, nanoparticles, nitrogen fertilizer, slow release en_US
dc.title Urea-Hydroxyapatite Nanohybrids for Slow Release of Nitrogen en_US
dc.type Article en_US
dc.identifier.doi 10.1021/acsnano.6b07781 en_US

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