Preparation of Layered Aramid Nanomembranes by Vacuum Assisted Filtration Using Water and Ethanol as Proton Donors

Cheng, Kan; Gu, Xinwang; Guo, Mao; Li, Mingzhuan; Lu, Shengjun; Fan, Haosen

doi:10.1007/s12221-022-4578-1

Cited by 1 publication

(2 citation statements)

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“…The ANFs were synthesized by the deprotonation process by splitting aramid fibers with diameters ranging from several micrometers to the nanoscale in a potassium hydroxide (KOH)/dimethyl sulfoxide (DMSO) solvent system, , resulting in a homogeneously dispersed solution of ANFs (Figure a). Subsequent studies have demonstrated that the ANFs/KOH/DMSO dispersion is humidity-sensitive, as the introduction of water accelerates the deprotonation of ANFs and leads to their aggregation. , TA aqueous solutions were gradually added to the ANFs/KOH/DMSO dispersion as a second component to mitigate the self-aggregation of ANFs. In the absence of TA, the color of the ANFs/KOH/DMSO/H 2 O was light yellow.…”

Section: Resultsmentioning

confidence: 99%

“…Subsequent studies have demonstrated that the ANFs/KOH/DMSO dispersion is humidity-sensitive, as the introduction of water accelerates the deprotonation of ANFs and leads to their aggregation. 26,31 TA aqueous solutions were gradually added to the ANFs/KOH/DMSO dispersion as a second component to mitigate the self-aggregation of ANFs. In the absence of TA, the color of the ANFs/KOH/DMSO/H 2 O was light yellow.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

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Aqueous Dispersion of Aramid Nanofibers Achieved by Using Tannic Acid for Ultrahigh Strength Films

Zhao,

Fu,

et al. 2024

ACS Appl. Mater. Interfaces

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Polymer nanofibers have established a robust foundation and possess immense potential in various emerging fields such as sensors and biotechnology. In this study, aqueous dispersions of aramid nanofibers (ANFs) were successfully prepared by using tannic acid (TA). Morphological analysis revealed that TA effectively prevented self-aggregation of ANFs, and preserved the nanofiber structure during TA-assisted solvent exchange. Subsequently, the ANF and TA/ANF films were fabricated using casting and vacuum-assisted filtration techniques. Notably, the tensile strength of the casting TA/ANF film reached 393.8 MPa, exhibiting a remarkable improvement of 41.3% compared to that of the pure ANF film. These exceptional mechanical properties can be attributed to the well-dispersed nanostructures, hydrogen-bonding interactions, zigzag structures, and fiber-bridging effects. Furthermore, the TA/ANF film demonstrated superior ultraviolet (UV) shielding capabilities, visible transparency properties, and excellent resistance to chemical reagents. The above-mentioned interesting findings demonstrate its potential as a nanofiber-reinforced material for poly(vinyl alcohol) (PVA) composites.

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