Nano- and microstructures of magnetic field-guided maghemite nanoparticles in diblock copolymer films.
Nano- and microstructures of magnetic field-guided maghemite nanoparticles in diblock copolymer films.
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二嵌段共聚物薄膜中磁场引导磁赤铁矿纳米粒子的纳米和微观结构
DOI：
10.1021/am500597t
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发表时间：
2014
影响因子：
9.5
通讯作者：
P.Müller- Buschbaum
中科院分区：
文献类型：
--
作者：
E.Metwalli;M.A.Niedermeier;M.Opel;J.Ning;J.Perlich;S.V.Roth;P.Müller- Buschbaum
研究了不同外加磁场对嵌段共聚聚合物基质中纳米颗粒取向的控制，以获得取向良好、高度定向的金属氧化物聚合物纳米颗粒。在一定的外加磁场条件下，采用溶液浇铸法制备了杂化薄膜。用光学显微镜、原子力显微镜、扫描电子显微镜和掠入射小角X射线散射等方法研究了聚苯乙烯-甲基丙烯酸乙酯嵌段共聚物膜中磁铁矿纳米粒子的纳米结构和微观结构随纳米粒子浓度的变化规律。由于聚苯乙烯(PS)涂层，纳米粒子被结合到两嵌段共聚物形态的PS结构域中。在较高的纳米粒子浓度下，纳米粒子聚集体扰乱了嵌段共聚物的结构，并在薄膜表面堆积成线状条带。这些线状纳米粒子聚集体的形成主要是由于纳米粒子-聚合物摩擦和磁偶极相互作用之间的竞争。考察了杂化薄膜在不同温度下的两个垂直于磁场方向(平行和垂直于磁场的线状颗粒聚集体)的磁性行为。混合薄膜系统表现出超顺磁性行为和显著的形状各向异性，这使得它们在磁性应用中具有很大的吸引力。
The control over the alignment of nanoparticles within a block copolymer matrix was investigated for different external magnetic fields with respect to producing well-aligned, highly oriented metal-oxide–polymer nanopatterns. Hybrid films were prepared by solution casting under a range of external magnetic fields. The nano- and microstructure of maghemite nanoparticles within poly(styrene-b-methyl methacrylate) diblock copolymer films as a function of the nanoparticle concentration was studied using optical microscopy, atomic force microscopy, scanning electron microscopy, and grazing incidence small-angle X-ray scattering. Because of a polystyrene (PS) coating, the nanoparticles are incorporated in the PS domains of the diblock copolymer morphology. At higher nanoparticle concentrations, nanoparticle aggregates perturb the block copolymer structure and accumulate at the films surface into wire-shaped stripes. These wire-shaped nanoparticle aggregates form mainly because of the competition between nanoparticle–polymer friction and magnetic dipolar interaction. The magnetic behavior of the hybrid films was probed at different temperatures for two orthogonal directions (with the line-shaped particle aggregates parallel and perpendicular to the magnetic field). The hybrid film systems show superparamagnetic behavior and remarkable shape anisotropy that render them interesting for magnetic applications.
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影响因子：
5.5
作者：
Robbes, Anne-Sophie;Jestin, Jacques;Cousin, Fabrice
通讯作者：
Cousin, Fabrice
使用新型流动技术进行聚合物模板辅助金纳米线的生长。
DOI：
10.1021/la901432j
发表时间：
2009
期刊：
Langmuir : the ACS journal of surfaces and colloids
影响因子：
--
作者：
E. Metwalli;J. Moulin;J. Perlich;W. Wang;A. Diethert;S. Roth;P. Müller‐Buschbaum
通讯作者：
P. Müller‐Buschbaum
影响因子：
9.5
作者：
Chen, Hongwei;Wu, Xinying;Duan, Hongwei;Wang, Y. Andrew;Wang, Liya;Zhang, Minming;Mao, Hui
通讯作者：
Mao, Hui
影响因子：
8.6
作者：
Scheinfein, MR;Schmidt, KE;Hembree, GG
通讯作者：
Hembree, GG
影响因子：
3.7
作者：
Sugawara, A;Scheinfein, MR
通讯作者：
Scheinfein, MR