Facile Route to Synthesize Polyurethane Hollow Microspheres with Size-Tunable Single Holes
Synthesis of polymer hollow spheres with single holes has been a challenging task in materials science. In this work, polyurethane (PU) hollow microspheres with size tunable single holes were fabricated through a facile self-assembly−diffusion process. Firstly, the as-synthesized PU polymers were di...
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Published in | Langmuir Vol. 27; no. 7; pp. 3229 - 3232 |
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Main Authors | , |
Format | Journal Article |
Language | English |
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Washington, DC
American Chemical Society
05.04.2011
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Abstract | Synthesis of polymer hollow spheres with single holes has been a challenging task in materials science. In this work, polyurethane (PU) hollow microspheres with size tunable single holes were fabricated through a facile self-assembly−diffusion process. Firstly, the as-synthesized PU polymers were dissolved in chloroform. By adding 10 times volume of water, the PU polymers were self-assembled into micelles in which the chloroform was encapsulated. The PU micelles were then transferred to methanol solution to allow the diffusion of chloroform. The formation of the single holes in shells of the resultant PU hollow spheres was induced by the out-diffusion of the encapsulated chloroform in methanol. By adjusting the diffusion time from 5 to 20 hours, the hole size could be tuned from 75 to 210 nm. The resultant PU hollow spheres with single holes demonstrated high loading efficiency of various guest materials such as nanospheres, nanoparticles, and chemical species, suggesting their promising applications in controlled release, chemical protection, catalysis, and so forth. |
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AbstractList | Synthesis of polymer hollow spheres with single holes has been a challenging task in materials science. In this work, polyurethane (PU) hollow microspheres with size tunable single holes were fabricated through a facile self-assembly−diffusion process. Firstly, the as-synthesized PU polymers were dissolved in chloroform. By adding 10 times volume of water, the PU polymers were self-assembled into micelles in which the chloroform was encapsulated. The PU micelles were then transferred to methanol solution to allow the diffusion of chloroform. The formation of the single holes in shells of the resultant PU hollow spheres was induced by the out-diffusion of the encapsulated chloroform in methanol. By adjusting the diffusion time from 5 to 20 hours, the hole size could be tuned from 75 to 210 nm. The resultant PU hollow spheres with single holes demonstrated high loading efficiency of various guest materials such as nanospheres, nanoparticles, and chemical species, suggesting their promising applications in controlled release, chemical protection, catalysis, and so forth. Synthesis of polymer hollow spheres with single holes has been a challenging task in materials science. In this work, polyurethane (PU) hollow microspheres with size tunable single holes were fabricated through a facile self-assembly-diffusion process. Firstly, the as-synthesized PU polymers were dissolved in chloroform. By adding 10 times volume of water, the PU polymers were self-assembled into micelles in which the chloroform was encapsulated. The PU micelles were then transferred to methanol solution to allow the diffusion of chloroform. The formation of the single holes in shells of the resultant PU hollow spheres was induced by the out-diffusion of the encapsulated chloroform in methanol. By adjusting the diffusion time from 5 to 20 hours, the hole size could be tuned from 75 to 210 nm. The resultant PU hollow spheres with single holes demonstrated high loading efficiency of various guest materials such as nanospheres, nanoparticles, and chemical species, suggesting their promising applications in controlled release, chemical protection, catalysis, and so forth. |
Author | Li, Meng Xue, Junmin |
AuthorAffiliation | National University of Singapore |
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Keywords | Water Self assembly Catalytic reaction Microsphere Chloroform Nanoparticle Micelle Alcohol Polymer Self diffusion Synthesis Efficiency Polyurethane Alkanol Chemical protection Nanosphere Catalysis Diffusion Release Methanol |
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Snippet | Synthesis of polymer hollow spheres with single holes has been a challenging task in materials science. In this work, polyurethane (PU) hollow microspheres... |
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SubjectTerms | Catalysis Chemistry Colloidal state and disperse state Exact sciences and technology General and physical chemistry Micelles Micelles. Thin films Microscopy, Electron, Scanning Microscopy, Electron, Transmission Microspheres Nanotechnology - methods Physical and chemical studies. Granulometry. Electrokinetic phenomena Polyurethanes - chemistry Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry |
Title | Facile Route to Synthesize Polyurethane Hollow Microspheres with Size-Tunable Single Holes |
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