Structural characterization of amphiphilic homopolymer micelles using light scattering, SANS, and cryo-TEM.
Structural characterization of amphiphilic homopolymer micelles using light scattering, SANS, and cryo-TEM.
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使用光散射，sans和Cryo-Tem对两亲均聚物胶束的结构表征。
DOI：
10.1021/ma4007544
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发表时间：
2013-08-13
期刊：
影响因子：
5.5
通讯作者：
O'Reilly RK
中科院分区：
文献类型：
--
作者：
Patterson JP;Kelley EG;Murphy RP;Moughton AO;Robin M;Lu A;Colombani O;Chassenieux C;Cheung D;Sullivan MO;Epps TH 3rd;O'Reilly RK
We report the aqueous solution self-assembly of a series of poly(N-isopropylacrylamide) (PNIPAM) polymers end-functionalized with a hydrophobic sulfur-carbon-sulfur (SCS) pincer ligand. Although the hydrophobic ligand accounted for <5 wt% of the overall homopolymer mass, the polymers self-assembled into well-defined spherical micelles in aqueous solution, and these micelles are potential precursors to solution-assembled nanoreactors for small molecule catalysis applications. The micelle structural details were investigated using light scattering, cryogenic transmission electron microscopy (cryo-TEM), and small angle neutron scattering (SANS). Radial density profiles extracted from the cryo-TEM micrographs suggested that the PNIPAM chains formed a diffuse corona with a radially decreasing corona density profile and provided valuable a priori information about the micelle structure for SANS data modeling. SANS analysis indicated a similar profile in which the corona surrounded a small hydrophobic core containing the pincer ligand. The similarity between the SANS and cryo-TEM results demonstrated that detailed information about the micelle density profile can be obtained directly from cryo-TEM and highlighted the complementary use of scattering and cryo-TEM in the structural characterization of solution-assemblies, such as the SCS pincer-functionalized homopolymers described here.
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