Journal article
Thermoresponsive Amphiphilic Janus Silica Nanoparticles via Combining "Polymer Single-Crystal Templating" and "Grafting-from" Methods
Macromolecules, v 45(21), pp 8780-8789
13 Nov 2012
Abstract
A facile method of synthesizing amphiphilic Janus silica nanoparticles (SiNPs) with bicompartment polymer brushes is presented in this article by combining "polymer single-crystal templating". (pSCryT) and "grafting from" techniques. First, alkoxysilane-terminated poly(epsilon-caprolactone) (PCL-SiOR) single crystals were prepared using a self seeding method. Silica nanoparticles (40-50 nm) were immobilized onto the surface of single crystals. Subsequent surface initiated atom transfer radical polymerization (SI-ATRP) of N-isopropylacrylamide was carried out on the exposed surface of SiNPs. Dissolution of the polymer single crystal led to Janus nanoparticles with amphiphilic, bicompartment poly(epsilon-caprolactone) (PCL) and poly(N-isopropylacrylamide) (PNIPAM) polymer brushes. The Janus nature of the particle and its detailed characteristics were studied using a variety of techniques including Fourier transform infrared spectroscopy, H-1 nuclear magnetic resonance spectroscopy, transmission electron microscopy, and thermogravimetric analysis. These Janus nanoparticles can be readily dispersed M Water at room temperature, and because of the lower critical solution temperature (LCST) behavior of PNIPAM brushes in water, Janus nanoparticles exhibit thermo-induced assembly with interesting molecular weight and concentration dependence. Compared with symmetrical PNIPAM-coated SiNPs, Janus particles showed a lower LCST temperature and a much narrower transition range.
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Details
- Title
- Thermoresponsive Amphiphilic Janus Silica Nanoparticles via Combining "Polymer Single-Crystal Templating" and "Grafting-from" Methods
- Creators
- Tian Zhou - Drexel UniversityBingbing Wang - Drexel UniversityBin Dong - Drexel UniversityChristopher Y. Li - Drexel University
- Publication Details
- Macromolecules, v 45(21), pp 8780-8789
- Publisher
- American Chemical Society; Washington, DC
- Number of pages
- 10
- Grant note
- DMR-0804838; CMMI-1100166 / NSF; National Science Foundation (NSF) W911NF-06-2-0013 / Army Materials Center of Excellence Program 1100166 / Directorate For Engineering; National Science Foundation (NSF); NSF - Directorate for Engineering (ENG)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000311245200030
- Scopus ID
- 2-s2.0-84869054812
- Other Identifier
- 991019168704404721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Polymer Science