Jun Zhang,Chao Hou,He Yu,Md All Amin Newton,Binjie Xin,Tingxiao Li
To address persistent challenges in wound care, including exudate management, infection prevention, and healing monitoring, this study developed a multifunctional fiber dressing using electrospinning technology. The system integrates a patterned hydrophobic polylactic acid/zinc oxide (PLA/ZnO) inner layer providing antimicrobial protection and exudate drainage; a polyacrylonitrile/polydopamine (PAN/PDA) intermediate water transport layer enabling unidirectional exudate transfer; and an outer PAN-based functional membrane incorporating sodium polyacrylate (SPA), phenol red (PSP), and tetracycline hydrochloride (TCH) for controlled drug release and visual wound status monitoring. The comprehensive evaluation revealed exceptional performance: rapid exudate removal within 3.35 s, 96 h sustained antibacterial drug release (68.6% cumulative release), pH-responsive chromatic transition (yellow-to-red at pH 5–9), and significant antimicrobial efficacy against Escherichia coli and Staphylococcus aureus (inhibition zone diameters of 10 and 18 mm, respectively). The dressing exhibited a balance of mechanical strength (6.1 MPa tensile strength) and breathability (13.4 mm/s air permeability rate). By integrating three core functions─efficient exudate management, antimicrobial regulation, and intelligent healing monitoring─this multifunctional architecture demonstrates clinical applicability in postoperative care and chronic wound therapy.
With the rapid development of next-generation wireless communication technologies, electromagnetic pollution has become an issue that cannot be overlooked. Designing lightweight, flexible composite materials with excellent electromagnetic shielding properties has become a significant challenge. This study designed a double-layer core-shell structure to fabricate polymer-based PAN@PDA@Ag nanofiber membranes. Scanning electron microscopy (SEM) studies revealed that the nanofiber exhibits a distinct core-shell structure. PAN@PDA nanofiber adsorbs silver nanoparticles (AgNPs) via chemical reduction, forming a dense conductive network layer. The morphology of fibers is achieved by regulating the contents of PDA. The [email protected] @Ag-90 fiber membranes, with a thickness of 0.06 mm, show an impressive conductivity of 3601.76 S/m and a shielding effectiveness of 85.6 dB. This work demonstrates that the synergistic effect among the components endows the composite with outstanding electromagnetic shielding performance, offering promising prospects for applications in next-generation wireless technologies.
Yang Wang,Zhen Chen,Yixin Wu,Yu Li,Ziyu Yue,Minghua Chen
Lithium-ion batteries (LIBs) have achieved a triumph in the market of portable electronic devices since their commercialization in the 1990s due to their high energy density. However, safety issue originating from the flammable, volatile, and toxic organic liquid electrolytes remains a long-standing problem to be solved. Alternatively, composite solid electrolytes (CSEs) have gradually become one of the most promising candidates due to their higher safety and stable electrochemical performance. However, the uniform dispersity of ceramic filler within the polymer matrix remains to be addressed. Generally, all-solid-state lithium metal batteries without any liquid components suffer from poor interfacial contact and low ionic conductivity, which seriously affect the electrochemical performance. Here we report a CSE consisting of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), polydopamine (PDA) coated Li6.4La3Zr1.4Ta0.6O12 (LLZTO) (denoted as PDA@LLZTO) microfiller, polyacrylonitrile (PAN), and poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP). Introducing only 4 μL of liquid electrolyte at the electrode|electrolyte interface, the CSE-based cells exhibit high ionic conductivity (0.4 × 10–3 S cm–1 at 25 °C), superior cycle stability, and excellent thermal stability. Even under low temperatures, the impressive electrochemical performance (78.8% of capacity retention after 400 cycles at 1 C, 0 °C, and decent capacities delivered even at low temperature of −20 °C) highlights the potential of such quasi-solid-state lithium metal batteries as a viable solution for the next-generation high-performance lithium metal batteries.
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