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硬脂酸和硬脂酸钠对纳米碳酸钙疏水性的影响及水蒸气吸附机理

Effect of stearic acid and sodium stearate on hydrophobicity of nano calcium carbonate and mechanism of water vapor adsorption.

作者信息

Huang Yifeng, Ma Lanyu, Huang Zhimin, Lai Wenqin, Zheng Yihua, Xu Mengxue, Yang Aimei, Liang Lige, Lu Zengmeng, Zhou Juying, Zhu Yong

机构信息

Guangxi Academy of Sciences, Nanning, 530000, People's Republic of China.

Joint Laboratory of Precipitated Calcium Carbonate, Nanning, 530006, People's Republic of China.

出版信息

Sci Rep. 2025 Jan 2;15(1):364. doi: 10.1038/s41598-024-82802-z.

DOI:10.1038/s41598-024-82802-z
PMID:39747940
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11696157/
Abstract

It is essential to understand the modification mechanism of hydrophobicity nano-CaCO to their potential application in different fields of chemistry. However, the water absorption of hydrophobicity nano-CaCO is seldom studied. In this study, Raman, BET and TGA experiments were performed on nano-CaCO samples to obtain surfactants contents and microstructure characteristics. SEM, TEM and DSL results showed that the nano-CaCO modified by stearic acid and sodium stearate had larger particle size and smaller nanoclusters. In the water vapor adsorption test, the order of saturation adsorption capacity was nano-CaCO(PCC) > nano-CaCO modified by sodium stearate(PCC-Sa-Na) > nano-CaCO modified by stearic acid(PCC-Sa), and XPS results showed that PCC-Sa had more hydrophobic groups than PCC-Sa-Na, which also explained that the hydrophobicity of PCC modified by stearic acid and sodium stearate was improved by increasing the hydrophobic bond on the surface of CaCO and reducing the hydrophilic groups. Our analysis provides a path for the design and the prediction of hydrophobicity of nano-CaCO, which is the main focus of our work.

摘要

了解疏水性纳米碳酸钙的改性机制对于其在不同化学领域的潜在应用至关重要。然而，疏水性纳米碳酸钙的吸水性很少被研究。在本研究中，对纳米碳酸钙样品进行了拉曼、BET和热重分析实验，以获得表面活性剂含量和微观结构特征。扫描电子显微镜、透射电子显微镜和动态光散射结果表明，经硬脂酸和硬脂酸钠改性的纳米碳酸钙具有更大的粒径和更小的纳米团簇。在水蒸气吸附试验中，饱和吸附容量的顺序为纳米碳酸钙（PCC）＞硬脂酸钠改性的纳米碳酸钙（PCC-Sa-Na）＞硬脂酸改性的纳米碳酸钙（PCC-Sa），X射线光电子能谱结果表明，PCC-Sa比PCC-Sa-Na具有更多的疏水基团，这也解释了硬脂酸和硬脂酸钠改性的PCC通过增加碳酸钙表面的疏水键和减少亲水基团来提高其疏水性。我们的分析为纳米碳酸钙疏水性的设计和预测提供了一条途径，这是我们工作的主要重点。

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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/457d/11696157/3cc96e6bec60/41598_2024_82802_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/457d/11696157/26d1929920d1/41598_2024_82802_Fig9_HTML.jpg
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