Polarized X-ray scattering measures molecular orientation in polymer-grafted nanoparticles.
Polarized X-ray scattering measures molecular orientation in polymer-grafted nanoparticles.
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DOI：
10.1038/s41467-021-25176-4
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发表时间：
2021-08-12
影响因子：
16.6
通讯作者：
DeLongchamp DM
中科院分区：
文献类型：
--
作者：
Mukherjee S;Streit JK;Gann E;Saurabh K;Sunday DF;Krishnamurthy A;Ganapathysubramanian B;Richter LJ;Vaia RA;DeLongchamp DM
聚合物链附着在纳米颗粒表面有许多目的，包括改变溶解度，影响聚集，分散，甚至在药物递送中调整免疫反应。聚合物接枝纳米颗粒（PGNs）最独特的结构基序是在冠的高密度区域，其中聚合物链在显着的限制下拉伸，但这些链的取向从未被测量，因为传统的纳米尺度分辨测量缺乏敏感性聚合物在无定形区域的取向。在这里，我们使用极化共振软X射线散射（P-RSoXS）直接测量聚苯乙烯接枝金纳米颗粒中的局部链取向。使用计算散射图案模拟方法，我们测量的厚度的各向异性区域的电晕和范围内it. These结果表明的权力P-RSoXS发现和量化的取向方面的结构在无定形软材料，并提供了一个框架，应用这种新兴的技术，以更复杂的，化学异构系统的未来。聚合物接枝纳米颗粒的冠中聚合物链的取向从未被测量过。在这里，作者使用极化共振软X射线散射来测量聚苯乙烯接枝金纳米颗粒中的局部链取向，并量化电晕各向异性区域的厚度以及其中链取向的程度。
Polymer chains are attached to nanoparticle surfaces for many purposes, including altering solubility, influencing aggregation, dispersion, and even tailoring immune responses in drug delivery. The most unique structural motif of polymer-grafted nanoparticles (PGNs) is the high-density region in the corona where polymer chains are stretched under significant confinement, but orientation of these chains has never been measured because conventional nanoscale-resolved measurements lack sensitivity to polymer orientation in amorphous regions. Here, we directly measure local chain orientation in polystyrene grafted gold nanoparticles using polarized resonant soft X-ray scattering (P-RSoXS). Using a computational scattering pattern simulation approach, we measure the thickness of the anisotropic region of the corona and extent of chain orientation within it. These results demonstrate the power of P-RSoXS to discover and quantify orientational aspects of structure in amorphous soft materials and provide a framework for applying this emerging technique to more complex, chemically heterogeneous systems in the future. The orientation of polymer chains in the corona of polymer-grafted nanoparticles has never been measured. Here, the authors use polarized resonant soft X-ray scattering to measure local chain orientation in polystyrene grafted gold nanoparticles and quantify the thickness of the anisotropic region of the corona as well as the extent of chain orientation within it.
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影响因子：
41.2
作者：
Akcora, Pinar;Liu, Hongjun;Douglas, Jack F.
通讯作者：
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影响因子：
1.6
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通讯作者：
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作者：
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通讯作者：
PETERMANN, J