发明名称 |
Microcapsules adapted to rupture in a magnetic field |
摘要 |
Controlled release of one or more agricultural chemicals is provided by microcapsules adapted to rupture in a magnetic field. The microcapsules, which may be applied to soil, seeds and/or plants, each have a shell that encapsulates an agricultural chemical, such as a fertilizer, herbicide or insecticide. One or more organosilane-coated magnetic nanoparticles is/are covalently bound into the shell of each microcapsule. For example, (3-aminopropyl)trimethylsilane-coated magnetite nanoparticles may be incorporated into the shell of a urea-formaldehyde (UF) microcapsule during in situ polymerization. In one embodiment, microcapsules encapsulating a fertilizer are applied during seed planting. Controlled release is subsequently triggered after an appropriate period of dormancy by positioning a magnetic field generating device proximate the microcapsules to generate a magnetic field sufficient to rupture the microcapsule shells through magnetic stimulation of the organosilane-coated magnetic nanoparticles. The ruptured microcapsule shells release the fertilizer. |
申请公布号 |
US9307692(B2) |
申请公布日期 |
2016.04.12 |
申请号 |
US201414244921 |
申请日期 |
2014.04.04 |
申请人 |
International Business Machines Corporation |
发明人 |
Boday Dylan J.;Kuczynski Joseph;Meyer, III Robert E. |
分类号 |
A01C21/00;A01N25/28;A01N25/00;C05G3/00 |
主分类号 |
A01C21/00 |
代理机构 |
|
代理人 |
Bussan Matthew J. |
主权项 |
1. A method of preparing microcapsules adapted to rupture in a magnetic field for controlled release of one or more agricultural chemicals, comprising the steps of:
providing organo trialkoxysilane-coated magnetic nanoparticles; incorporating one or more of the organo trialkoxysilane-coated magnetic nanoparticles into a shell of each of a plurality of urea-formaldehyde (UF) microcapsules while encapsulating an agricultural chemical into a core of each of the plurality of UF microcapsules, wherein the step of incorporating one or more of the organo trialkoxysilane-coated magnetic nanoparticles into a shell of each of a plurality of UF microcapsules while encapsulating an agricultural chemical into a core of each of the plurality of UF microcapsules includes the step of incorporating one or more organosilane-coated magnetic nanoparticles into the shell of each of the UF microcapsules during in situ polymerization of the UF microcapsules. |
地址 |
Armonk NY US |