This study aimed to reveal the interaction between self-assembled multilayers and dye molecules in the environment, which is closely related to the multilayers' stable performance and service life. In this work, the pH-responsive poly (N-isopropylacrylamide-co-2-(dimethylamino) ethyl methacrylate) microgels were prepared by free-radical copolymerization and self-assembled with sodium alginate (SA) into multilayers by the layer-by-layer deposition method. Quartz crystal microbalance (QCM) and atomic force microscopy (AFM) results confirmed the construction of multilayers and the absorbed mass, resulting in a decrease in the frequency shift of the QCM sensor and the deposition of microgel particles on its surface. The interaction between the self-assembled SA/microgel multilayers and anionic dyes in the aqueous solution was further investigated by QCM, and it was found that the electrostatic attraction between dyes and microgels deposited on the QCM sensor surface was much larger than that of the microgels with SA in multilayers, leading to the release of the microgels from the self-assembled structure and a mass loss ratio of 27.6%. AFM observation of the multilayer morphology exposed to dyes showed that 29% of the microgels was peeled off, and the corresponding microgel imprints were generated on the surface. In contrast, the shape and size of the remaining self-assembled microgel particles did not change.
Abstract Metal powder injection molding (MIM) has been a popular technique in production of alloy materials. Through this technique, near-net-shape alloy products can be molded with one-step production. Stainless steel 316L (SS316L) is an important material in aerospace and marine industry for its excellent material strength and resistance to corrosion. As the industry grows with upgraded techniques, the standard for next generation material strength has improved tremendously. Here we present a practical method strengthening SS316L via MIM technique, which might provide a pathway for exploration of high strength materials. TiC was introduced into SS316 matrix with polyoxymethylene (POM) binder. The metallography indicates that the introduction of TiC facilitates the refinement of the 316L grain. As the TiC content increases from 0 wt% to 3 wt%, the material properties improve significantly, including a rise in hardness from 151 HV to 301 HV, tensile strength from 689 MPa to 792 MPa, and yield strength from 221 MPa to 339 MPa. Additionally, there is a noticeable reduction in the coefficient of friction and the wear cross-section.
We fabricated mesoporous hydroxylapatite/activated carbon bead-on-string nanofibers from electrospun nanofibers by a hydrothermal method and evaluated their sorption towards Co(ii)viasorption kinetics and isotherms.
Front Cover: Controlled carbonization is very critical in improving the effect of laser-induced patterns on a polymer surface. In article number 1800726 by Chunlin Liu, Hongting Pu, and co-workers, an efficient and flexible method to produce high definition and high contrast laser patterned polymers is developed through the multilayered structure via nanolayer coextrusion. The effects of a multilayered structure on the laser responsive properties are studied, and a mechanism for controlling the carbonized area of a multilayered film is proposed. Note that the pattern “loong” (Chinese mascot) is marked on the laser response layers by laser treatment. This work opens up a valuable and viable direction for the practical application of these multilayered polymer materials.
Polystyrene modified bismuth oxide particles (PS@Bi2O3) were prepared and characterized by Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM).
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