氮化硼纳米管水分散体的溶向液晶相行为

IF 3.9 2区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Joe F. Khoury, Asia Matatyaho Ya’akobi, Alina Chow, Eldar Khabushev, Irina Davidovich, Davide Cavuto, Mingrui Gong, Lyndsey R. Scammell, Cheol Park, Yeshayahu Talmon, Angel A. Martí and Matteo Pasquali*, 
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引用次数: 0

摘要

氮化硼纳米管(bnnt)由于其优异的机械和热性能以及作为纳米棒模型系统的潜力而引起了人们的极大兴趣。处理BNNT液晶(LC)分散体可以精确控制宏观组装中的BNNT取向,而它们在可见光谱中的低吸收有助于在异常高浓度下研究LC。在此,我们研究了BNNT在表面活性剂脱氧胆酸钠(SDC)稳定水溶液中的行为,考察了BNNT纯度和BNNT - SDC浓度对溶性LC形成的影响。我们在SDC溶液中分散了高达15%的BNNT,并使用偏振光显微镜详细描述了从各向同性状态到双相状态的转变,其中各向同性和向列相域由于相分离而共存,再到一个完全向列相。低温电子显微镜提供了向列域内BNNT排列的直接证据。我们的研究结果表明,在表面活性剂浓度增加的驱动下,消耗诱导的吸引力增强,降低了形成向列结构域所需的BNNT的阈值浓度。相比之下,相对于BNNT的低表面活性剂浓度导致纳米管表面未被充分涂覆,导致分散性和BNNT聚集性差。此外,我们还利用液相色谱分散体制备了排列良好的BNNT薄膜。我们的研究结果促进了对BNNT lc的理解,为控制其方向提供了见解,并突出了它们作为高性能材料的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Lyotropic Liquid Crystalline Phase Behavior of Boron Nitride Nanotube Aqueous Dispersions

Lyotropic Liquid Crystalline Phase Behavior of Boron Nitride Nanotube Aqueous Dispersions

Lyotropic Liquid Crystalline Phase Behavior of Boron Nitride Nanotube Aqueous Dispersions

Boron nitride nanotubes (BNNTs) are gaining significant interest due to their outstanding mechanical and thermal properties, as well as their potential to serve as a model nanorod system. Processing BNNT liquid crystalline (LC) dispersions enables precise control over BNNT orientation in macroscopic assemblies, while their low absorption in the visible spectrum facilitates studying LCs at exceptionally high concentrations. Here, we investigate the behavior of BNNTs in aqueous solutions stabilized by the surfactant sodium deoxycholate (SDC), examining the effect of BNNT purity and BNNT–SDC concentrations on lyotropic LC formation. We disperse up to 15 wt % BNNT in SDC solutions and use polarized light microscopy to detail the transition from an isotropic state to a biphasic regime, where isotropic and nematic domains coexist due to phase separation, to a single fully nematic phase. Cryogenic electron microscopy provides direct evidence of BNNT alignment within nematic domains. Our results show that enhanced depletion-induced attractions, driven by increased surfactant concentration, lower the threshold concentration of BNNT required to form nematic domains. In contrast, low surfactant concentrations relative to BNNT result in insufficiently coated nanotube surfaces, leading to poor dispersions and BNNT aggregation. Additionally, we fabricate well-aligned BNNT films from aqueous LC dispersions. Our findings advance the understanding of BNNT LCs, offering insight into controlling their orientation and highlighting their potential for high-performance materials.

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来源期刊
Langmuir
Langmuir 化学-材料科学:综合
CiteScore
6.50
自引率
10.30%
发文量
1464
审稿时长
2.1 months
期刊介绍: Langmuir is an interdisciplinary journal publishing articles in the following subject categories: Colloids: surfactants and self-assembly, dispersions, emulsions, foams Interfaces: adsorption, reactions, films, forces Biological Interfaces: biocolloids, biomolecular and biomimetic materials Materials: nano- and mesostructured materials, polymers, gels, liquid crystals Electrochemistry: interfacial charge transfer, charge transport, electrocatalysis, electrokinetic phenomena, bioelectrochemistry Devices and Applications: sensors, fluidics, patterning, catalysis, photonic crystals However, when high-impact, original work is submitted that does not fit within the above categories, decisions to accept or decline such papers will be based on one criteria: What Would Irving Do? Langmuir ranks #2 in citations out of 136 journals in the category of Physical Chemistry with 113,157 total citations. The journal received an Impact Factor of 4.384*. This journal is also indexed in the categories of Materials Science (ranked #1) and Multidisciplinary Chemistry (ranked #5).
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