小角X射线散射
散射
体积分数
材料科学
结构因子
表征(材料科学)
芯(光纤)
软物质
相(物质)
化学物理
聚合物
胶体
胶体金
化学工程
纳米颗粒
结晶学
纳米技术
化学
光学
复合材料
物理化学
物理
有机化学
工程类
作者
Marco Hildebrandt,Sergey Lazarev,Javier Pérez,Ivan Vartaniants,Janne‐Mieke Meijer,Matthias Karg
出处
期刊:Macromolecules
[American Chemical Society]
日期:2022-04-01
卷期号:55 (7): 2959-2969
被引量:3
标识
DOI:10.1021/acs.macromol.2c00100
摘要
To explore dense packings of soft colloids, scattering experiments are ideal to access the structure factor. However, for soft microgels, determination of the structure factor is difficult because of the low contrast of the polymer network and potential microgel interpenetration and deformation that change the form factor contribution. Here, we employ small-angle X-ray scattering (SAXS) to study soft, thermoresponsive microgels with poly-N-isopropylacrylamide (PNIPAM) shells and gold nanoparticle cores. The scattering of the gold cores dominates the scattering patterns and allows precise determination of the microgel volume fraction over a broad range of concentrations. At high volume fractions, we find distinct patterns with sharp Bragg peaks allowing extraction of the structure factor and characterization of the phases combined with UV–vis spectroscopy. The unique scattering contrast of our core–shell microgels combined with SAXS opens up new ways to investigate dense packings of soft microgels including in situ studies of phase transitions.
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