Thermal Stability and Photostability of Highly Confined Molecular Nanocomposites.

IF 2.8 2区 化学 Q3 CHEMISTRY, PHYSICAL
The Journal of Physical Chemistry B Pub Date : 2024-12-26 Epub Date: 2024-12-12 DOI:10.1021/acs.jpcb.4c06713
Cindy Yueli Chen, Haonan Wang, Ahmad Arabi Shamsabadi, Zahra Fakhraai
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引用次数: 0

Abstract

Capillary rise infiltration of molecular glasses into self-assembled layers of rigid nanoparticles (NPs) can produce highly confined molecular nanocomposite films (MNCFs). Here, we investigate the thermal stability and photostability of MNCFs made by confining indomethacin glasses in silica NPs. We demonstrate increasing confinement decreases the rate of thermal degradation and increases the activation energy of degradation (up to ∼70 kJ/mol in 11 nm NPs, ∼3 nm pore size). Upon UV exposure under nitrogen, photodegradation is only observed at the near-surface region of MNCFs, with a thickness of one NP diameter. However, no further degradation is observed, even after prolonged UV exposure. The dramatically improved thermal stability and photostability of MNCFs can be attributed to the slower transport of reaction products, corresponding to the increased Tg (up to ∼30 K in 11 nm NPs). These findings demonstrate that extreme nanoconfinement can prolong the durability of molecular glasses in applications such as coatings and organic electronics.

高受限分子纳米复合材料的热稳定性和光稳定性。
分子玻璃毛细管上升渗透到自组装的刚性纳米颗粒层中,可以产生高约束的分子纳米复合膜(mncf)。本文研究了在二氧化硅NPs中包封吲哚美辛玻璃制备的mncs的热稳定性和光稳定性。我们证明,增加约束会降低热降解的速率,并增加降解的活化能(在11 nm的NPs中高达70 kJ/mol,孔径为3 nm)。在氮气的紫外线照射下,仅在mncf的近表面区域观察到光降解,其厚度为1 NP直径。然而,即使长时间暴露在紫外线下,也没有观察到进一步的降解。mncf的热稳定性和光稳定性的显著提高可归因于反应产物的较慢传输,对应于Tg的增加(在11 nm NPs中高达30 K)。这些发现表明,极端的纳米限制可以延长分子玻璃在涂料和有机电子等应用中的耐久性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
5.80
自引率
9.10%
发文量
965
审稿时长
1.6 months
期刊介绍: An essential criterion for acceptance of research articles in the journal is that they provide new physical insight. Please refer to the New Physical Insights virtual issue on what constitutes new physical insight. Manuscripts that are essentially reporting data or applications of data are, in general, not suitable for publication in JPC B.
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