Enhanced dispersion of mixed-dimensional palygorskite clay via high-pressure homogenization and its synergistic reinforcement in chitosan composites
Source abstract
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.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Clay minerals and soil interactions · Geotechnical and construction materials studies · Concrete and Cement Materials Research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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