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探究聚对二氧六环中形成周期性光栅的纳米组装过程。

Probing the Nano-Assembly Leading to Periodic Gratings in Poly(p-dioxanone).

作者信息

Hao Min-Han, Nagarajan Selvaraj, Woo Eamor M

机构信息

Department of Chemical Engineering, National Cheng Kung University, No. 1, University Road, Tainan 701-01, Taiwan.

出版信息

Nanomaterials (Basel). 2023 Sep 28;13(19):2665. doi: 10.3390/nano13192665.

DOI:10.3390/nano13192665
PMID:37836306
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10574605/
Abstract

This study used scanning electron microscopy via 3D dissection coupled with synchrotron radiation with microfocal beams of both small-angle X-ray scattering and wide-angle X-ray diffraction to analyze the periodic crystal aggregates of unusual poly(p-dioxanone) (PPDO) dendritic cactus-arm-like ring bands upon crystallization with a diluent poly(vinyl alcohol) (PVA) that is capable of hydrogen bonding interactions with PPDO. Three-dimensional microscopy interior dissection clearly expounds that the banded periodic architectures are packed by alternately normal-oriented flat-on crystals underneath the valley, periodically interfaced/branched with horizontal-oriented edge-on fibrils underneath the ridge. The oblique angles between the valley's flat-on crystals with the branches are ca. 25-45° (depending on gradient inclines and bending), which is also proved by the azimuthal angle in microbeam X-ray diffraction. The grating-like strut-rib assembly in the PPDO cactus-arm-like ring bands is further proved by novel iridescence tests.

摘要

本研究通过三维解剖结合同步辐射，利用小角X射线散射和广角X射线衍射的微聚焦束扫描电子显微镜，分析了非常规聚对二氧环己酮（PPDO）树枝状仙人掌臂状环带与能够与PPDO形成氢键相互作用的稀释剂聚乙烯醇（PVA）结晶时的周期性晶体聚集体。三维显微镜内部解剖清楚地表明，带状周期性结构由谷底交替排列的垂直取向的平躺晶体堆积而成，在脊下与水平取向的边缘取向原纤维周期性地相接/分支。谷底平躺晶体与分支之间的倾斜角约为25-45°（取决于梯度倾斜和弯曲情况），这也通过微束X射线衍射中的方位角得到了证实。PPDO仙人掌臂状环带中类似光栅的支柱-肋条组件通过新颖的虹彩测试得到了进一步证实。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9282/10574605/0c6432b7b97b/nanomaterials-13-02665-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9282/10574605/4d04f40be8ea/nanomaterials-13-02665-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9282/10574605/e2d0cfe61b4f/nanomaterials-13-02665-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9282/10574605/5a9ad2a0c52a/nanomaterials-13-02665-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9282/10574605/9dbc2ec85926/nanomaterials-13-02665-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9282/10574605/81a5e54a07ab/nanomaterials-13-02665-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9282/10574605/3262c7d2aa29/nanomaterials-13-02665-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9282/10574605/660f8bed9b6e/nanomaterials-13-02665-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9282/10574605/5298fb1e5038/nanomaterials-13-02665-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9282/10574605/75a2a0afd721/nanomaterials-13-02665-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9282/10574605/0c6432b7b97b/nanomaterials-13-02665-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9282/10574605/4d04f40be8ea/nanomaterials-13-02665-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9282/10574605/e2d0cfe61b4f/nanomaterials-13-02665-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9282/10574605/5a9ad2a0c52a/nanomaterials-13-02665-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9282/10574605/9dbc2ec85926/nanomaterials-13-02665-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9282/10574605/81a5e54a07ab/nanomaterials-13-02665-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9282/10574605/3262c7d2aa29/nanomaterials-13-02665-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9282/10574605/660f8bed9b6e/nanomaterials-13-02665-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9282/10574605/5298fb1e5038/nanomaterials-13-02665-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9282/10574605/75a2a0afd721/nanomaterials-13-02665-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9282/10574605/0c6432b7b97b/nanomaterials-13-02665-g010.jpg

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