Enhanced dispersion of mixed-dimensional palygorskite clay via high-pressure homogenization and its synergistic reinforcement in chitosan composites

IF 5.8 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science Pub Date : 2025-09-26 DOI:10.1016/j.clay.2025.108000

Yushen Lu , Bin Mu , Yuru Kang , Wenting Gao , Aiqin Wang

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Abstract

The nanoscale structural characteristics of natural mixed-dimensional palygorskite clay (MDPal) are limited during applications due to the tight interlacing and aggregation of one-dimensional palygorskite nanorods and two-dimensional layered clay mineral nanosheets. In this study, high-pressure homogenization (HPH) technology was used to disaggregate and enhance the dispersion of acid-leached whitened MDPal (WMDPal) for the reinforcement of chitosan films. The results indicated that HPH successfully realized the disaggregation of one-dimensional palygorskite crystal bundles and the synchronous exfoliation of two-dimensional layered clay minerals, accompanied with the exposure of oxalate by-product particles, thereby significantly enhancing the dispersion of WMDPal. The degree of dispersion was positively correlated with the increase in the homogenization pressure and cycles. The introduction of the well-dispersed WMDPal obviously improved the mechanical properties and surface hydrophobicity of chitosan composite films due to strong interfacial interaction and the synergistic effect of mixed-dimensional nanoscale heterostructure composed one-dimensional nanorods and two-dimensional nanosheets. The optimal WMDPal/CS composite films presented remarkable mechanical improvements with an increase in the tensile strength of 63.49 % to 20.42 MPa, while the elongation at break increased by 67.35 % to 79.16 %, which was superior to that of composite films reinforced with individual high-purity palygorskite or illite, highlighting the promising application potential of natural clays with the multi-mineral compositions and mixed-dimensional nanostructural features. Based on the exploration of intrinsic structural heterogeneity to unique functional advantage, this study paves the way for the development of high-performance composites based on natural mixed-dimensional heterostructure of MDPal.

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高压均质增强混维坡筋土在壳聚糖复合材料中的分散及其协同增强

天然混合维粘土矿粘土（MDPal）的纳米级结构特征在应用过程中受到限制，因为一维的粘土矿纳米棒与二维的层状粘土矿物纳米片紧密交错和聚集。本研究采用高压均质（HPH）技术对酸浸漂白MDPal （WMDPal）进行分解和分散，以增强壳聚糖膜。结果表明，HPH成功地实现了一维坡齿石晶体束的崩解和二维层状粘土矿物的同步剥落，同时伴有草酸副产物颗粒的暴露，从而显著增强了WMDPal的分散性。分散程度与均质压力和循环次数的增加呈正相关。分散良好的WMDPal的引入，由于强大的界面相互作用和由一维纳米棒和二维纳米片组成的混合纳米异质结构的协同作用，明显改善了壳聚糖复合膜的力学性能和表面疏水性。优化后的WMDPal/CS复合膜的力学性能得到显著改善，拉伸强度提高63.49% ~ 20.42 MPa，断裂伸长率提高67.35% ~ 79.16%，优于单独添加高纯坡缕石或伊莱石的复合膜，凸显了具有多矿物组成和混合维纳米结构特征的天然粘土的广阔应用前景。本研究基于对MDPal固有结构非均质性的探索和独特的功能优势，为开发基于MDPal天然混维异质结构的高性能复合材料铺平了道路。

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来源期刊

Applied Clay Science 地学-矿物学

CiteScore

10.30

自引率

10.70%

发文量

289

审稿时长

39 days

期刊介绍： Applied Clay Science aims to be an international journal attracting high quality scientific papers on clays and clay minerals, including research papers, reviews, and technical notes. The journal covers typical subjects of Fundamental and Applied Clay Science such as: • Synthesis and purification • Structural, crystallographic and mineralogical properties of clays and clay minerals • Thermal properties of clays and clay minerals • Physico-chemical properties including i) surface and interface properties; ii) thermodynamic properties; iii) mechanical properties • Interaction with water, with polar and apolar molecules • Colloidal properties and rheology • Adsorption, Intercalation, Ionic exchange • Genesis and deposits of clay minerals • Geology and geochemistry of clays • Modification of clays and clay minerals properties by thermal and physical treatments • Modification by chemical treatments with organic and inorganic molecules(organoclays, pillared clays) • Modification by biological microorganisms. etc...