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The macroscopic shape of assemblies formed from microparticles based on host-guest interaction dependent on the guest content
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DOI：10.1038/s41598-021-85816-z.png)
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Abstract
En 中文
Biological macroscopic assemblies have inspired researchers to utilize molecular recognition to develop smart materials in these decades. Recently, macroscopic self-assemblies based on molecular recognition have been realized using millimeter-scale hydrogel pieces possessing molecular recognition moieties. During the study on macroscopic self-assembly based on molecular recognition, we noticed that the shape of assemblies might be dependent on the host-guest pair. In this study, we were thus motivated to study the macroscopic shape of assemblies formed through host-guest interaction. We modified crosslinked poly(sodium acrylate) microparticles, i.e., superabsorbent polymer (SAP) microparticles, with beta-cyclodextrin (beta CD) and adamantyl (Ad) residues (beta CD(x)-SAP and Ad(y)-SAP microparticles, respectively, where x and y denote the mol% contents of beta CD and Ad residues). Then, we studied the self-assembly behavior of beta CD(x)-SAP and Ad(y)-SAP microparticles through the complexation of beta CD with Ad residues. There was a threshold of the beta CD content in beta CD(x)-SAP microparticles for assembly formation between x=22.3 and 26.7. On the other hand, the shape of assemblies was dependent on the Ad content, y; More elongated assemblies were formed at a higher y. This may be because, at a higher y, small clusters formed in an early stage can stick together even upon collisions at a single contact point to form elongated aggregates, whereas, at a smaller y, small clusters stick together only upon collisions at multiple contact points to give rather circular assemblies. On the basis of these observations, the shape of assembly formed from microparticles can be controlled by varying y.
Keywords:
MOLECULAR-RECOGNITION
COLLOIDAL STRUCTURES
KINETIC AGGREGATION
CYCLODEXTRINS
HYDROGELS
GEL
NANOPARTICLE
ADSORPTION
SIMULATION
STABILITY
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