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木质素磺酸盐/二氧化硅无机颗粒体系中的原子力显微镜力学测试——从分散机理研究到产品设计
Jingyu Wang, Yong Qian, Yijie Zhou, Dongjie Yang, Xueqing Qiu
工程（英文） ›› 2021, Vol. 7 ›› Issue (8) : 1140-1148.
PDF(1758 KB)
PDF(1758 KB)
木质素磺酸盐/二氧化硅无机颗粒体系中的原子力显微镜力学测试——从分散机理研究到产品设计
Atomic Force Microscopy Measurement in the Lignosulfonate/Inorganic Silica System: From Dispersion Mechanism Study to Product Design
设计和制备高性能木质素基分散剂是实现木质素工程化高值利用的关键。这一过程很大程度上取决于对木质素基分散剂分散机理的理解。本文通过原子力显微镜（AFM）量化研究了木质素磺酸盐/二氧化硅（LS/SiO2）体系在不同pH条件下的分散机理。结果表明，SiO2颗粒之间在LS溶液中比在水中有更强的排斥力，因此具有更好的分散稳定性。分别使用Derjaguin-Landau-Verwey-Overbeek (DLVO)理论以及结合空间位阻排斥力的DLVO理论方程对水中和LS溶液中的SiO2探针与基材之间的AFM力/距离曲线（F/D）进行拟合。基于拟合结果，分别计算出静电排斥力和空间位阻排斥力，证明LS在SiO2粒子之间提供了较强的空间位阻排斥力。进一步研究证明，LS在SiO2上的吸附量（Q）、归一化作用常数（A）和特征长度（L）是影响LS/SiO2体系空间位阻排斥力的三个关键因素。基于上述研究，设计并制备了新型季铵化接枝磺化木质素基分散剂（QAGSL）。QAGSL对SiO2和真实水泥颗粒均具有良好的分散性能。相关研究既为LS/无机颗粒体系中的分散机理提供了基础和定量的理解，也为高性能木质素基分散剂的开发提供了重要的技术指导。
Designing and preparing high-performance lignin-based dispersants are crucial steps in realizing the value-added utilization of lignin on an industrial scale. Such process depends heavily on an understanding of the dispersion mechanism of lignin-based dispersants. Here, atomic force microscopy (AFM) is employed to quantitatively investigate the dispersion mechanism of a lignosulfonate/silica (LS/SiO2) system under different pH conditions. The results show that the repulsive force between SiO2 particles in LS solution is stronger than it is in water, resulting in better dispersion stability. The Derjaguin–Landau–Verwey–Overbeek (DLVO) formula as well as the DLVO formula combined with steric repulsion is utilized for the fitting of the AFM force/distance (F/D) curves between the SiO2 probe and substrate in water and in LS solution. Based on these fitting results, electrostatic and steric repulsive forces are respectively calculated, yielding further evidence that LS provides strong steric repulsion between SiO2 particles. Further studies indicate that the adsorbance of LS on SiO2 (Q), the normalized interaction constant (A), and the characteristic length (L) are the three critical factors affecting steric repulsion in the LS/SiO2 system. Based on the above conclusions, a novel quaternized grafted-sulfonation lignin (QAGSL) dispersant is designed and prepared. The QAGSL dispersant exhibits good dispersing performance for SiO2 and real cement particles. This work provides a fundamental and quantitative understanding of the dispersion mechanism in the LS/inorganic particle system and provides important guidance for the development of high-performance lignin-based dispersants.
木质素 / 二氧化硅 / 原子力显微镜 / 分散机理 / 产品设计
Lignin / Silica / Atomic force microscopy / Dispersion mechanism / Product design
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