Controllable synthesis of snowflake-like α-calcium sulfate hemihydrate microstructures using Na2EDTA as morphology modifier

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-03-25 DOI:10.1002/apj.3064

Lingling Lv, Yang Gao, Ming Guo, Minfu Liu, Baocun Zhang, Han Lin, Xingong Zhang, Chenguang Liu

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引用次数: 0

Abstract

In this work, snowflake-like α-CaSO₄·0.5H₂O (α-CSH) hierarchical architectures were successfully synthesized by a facile one-pot method in an ethylene glycol-water system using Na₂EDTA as a crystal morphology modifier. Characterization techniques including X-ray diffraction (XRD), thermogravimetric (TG) analysis, differential scanning calorimetry (DSC), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR) confirmed the progressive morphological evolution of α-CSH from rods to snowflake-like structures ultimately to hexagonal plates with increased Na₂EDTA concentrations. The results revealed that Na₂EDTA concentration played a critical role in directing the crystallization and self-assembly of α-CSH, and a mechanism is proposed where Na₂EDTA modulated crystal orientation through preferential adsorption and regulated the driving forces between ion-mediated crystallization and particle-mediated assembly. This work puts forward a simple yet effective strategy for facilely regulating the morphology of α-CSH microstructures, which could potentially expand their applications across diverse fields such as composites, construction, biomedicine, and drug delivery.

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使用 Na2EDTA 作为形态改性剂可控合成雪花状 α-硫酸钙半水合物微结构

本研究以 Na2EDTA 为晶体形态改性剂，在乙二醇-水体系中采用简便的一锅法成功合成了雪花状 α-CaSO4-0.5H2O (α-CSH)分层结构。包括 X 射线衍射 (XRD)、热重分析 (TG)、差示扫描量热法 (DSC)、扫描电子显微镜 (SEM) 和傅立叶变换红外光谱 (FTIR) 在内的表征技术证实，随着 Na2EDTA 浓度的增加，α-CSH 的形态从棒状结构逐渐演变为雪花状结构，并最终演变为六方板状结构。研究结果表明，Na2EDTA 浓度在引导 α-CSH 结晶和自组装方面起着关键作用，并提出了一种机制，即 Na2EDTA 通过优先吸附调节晶体取向，并调节离子介导的结晶和颗粒介导的组装之间的驱动力。这项研究提出了一种简单而有效的策略，可以方便地调节 α-CSH 微结构的形态，从而有可能扩大其在复合材料、建筑、生物医学和药物输送等不同领域的应用。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.