In this study, a structural adhesive was used to bond unidirectional prepreg and fiber fabric in a single lap joint. The mechanical properties of the structural adhesive were investigated under room temperature dry state (RTD) and elevated temperature wet state (ETW, 71 ℃/85% RH), and different adhesive layer thicknesses (0.5 mm, 1.0 mm, 1.5 mm, and 2.0 mm). The fracture surfaces of the bonded joints were examined using scanning electron microscopy (SEM), and finite element simulations were conducted to observe the failure modes and failure paths. Additionally, the specimens were immersed in water and hydraulic oil, and their tensile shear strength was tested to evaluate their liquid sensitivity. The experimental results indicated that with increasing adhesive layer thickness, the strength of the specimens decreased by 21% in the RTD and by 52% in the ETW. The strength differences between different environments were minimal for adhesive layer thicknesses of 1 mm and 1.5 mm. The shear strength of the specimens decreased after immersion in water and hydraulic oil, with reductions of 43.78% and 39.21%, compared to the room temperature dry respectively. SEM observations of the bonded joint sections revealed that the primary failure modes were adherend failure and adhesive layer failure. Finite element simulations indicated that fiber tearing and crack initiation occurred in stress concentration areas during loading, leading to structural failure.
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http://dx.doi.org/10.1038/s41598-024-73987-4 | DOI Listing |
J Control Release
December 2024
School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China; State Key Laboratory of Anti-Infective Drug Discovery and Development, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China; Guangdong Provincial Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China. Electronic address:
Therapeutic challenges of chronic pulmonary infections caused by multidrug-resistant Pseudomonas aeruginosa (MDRP. aeruginosa) biofilms due to significantly enhanced antibiotic resistance. This resistance is driven by reduced outer membrane permeability, biofilm barriers, and excessive secretion of virulence factors.
View Article and Find Full Text PDFACS Appl Mater Interfaces
December 2024
Department of Materials and Environmental Chemistry, Stockholm University, Svante Arrhenius väg 16C, 10691 Stockholm, Sweden.
There is a growing demand for biobased functional materials that can ensure targeted pesticide delivery and minimize active ingredient loss in the agricultural sector. In this work, we demonstrated the use of esterified lignin nanoparticles (ELNPs) as carriers and controlled-release agents of hydrophobic compounds. Curcumin was selected as a hydrophobic model compound and was incorporated during ELNP fabrication with entrapment efficiencies exceeding 95%.
View Article and Find Full Text PDFInt J Biol Macromol
December 2024
School of Civil Engineering, Liaoning Technical University, Fuxin 123000, China; Resource utilization of coal gangue and energy-saving building materials Liaoning Provincial Key Laboratory, Liaoning Technical University, Fuxin 123000, China.
In response to the dust pollution problem in open-pit mines, an environmentally friendly network structure with a dust suppressor structure was prepared by grafting acrylamide (AM) monomers onto xanthan gum (XG). The results show that the polymer produced from 1 g XG, 15 g AM, and 0.45 g trimethylolpropane triglycidyl ether (TTE) had a more orderly structured gel with a viscosity of 81.
View Article and Find Full Text PDFMonaldi Arch Chest Dis
December 2024
Department of Pulmonology, Shaikh Zayed Hospital, Federal Postgraduate Medical Institute, Lahore.
The management of persistent malignant pleural effusion (MPE) or uremic pleural effusions requires the removal of pleural fluid and the prevention of recurrence through pleurodesis. Pleurodesis involves injecting a sclerosing agent into the pleura to encourage adhesion between the two layers, ultimately obliterating the pleural space. Povidone-iodine is a potential pleurodesing agent.
View Article and Find Full Text PDFAdv Mater
December 2024
Faculty of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640, P. R. China.
Antiadhesive coatings have been extensively studied owing to their wide applications in biology, environment, and energy. However, developing a mechanically robust coating with broad-spectrum antiadhesion properties remains challenging. Herein, a novel strategy for preparing hard yet flexible and self-adaptive zwitterionic polysilazane coatings with broad-spectrum antiadhesion properties (anti-biofouling, anti-liquid adhesion, and anti-scaling) is proposed.
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