Institute of Textile Chemistry and Chemical Fibers

Structural colors have attracted significant attention due to their unique advantages, including high color saturation, resistance to fading and environmental friendliness. However, most current fabrication strategies rely on tuning nanoscale features, typically by preparing nanospheres of varying sizes to achieve different structural colors, resulting in complex and laborious processes. To address this challenge, this study employs the principle of additive color mixing to simply and effectively fabricate structural-color textiles with a low angular dependency across the entire visible spectrum. Specifically, this goal was achieved by pairwise mixing three distinct sizes of silica (SiO2) nanospheres─each size corresponding to a structural-color output of red, green, or blue─in predetermined ratios, followed by their deposition onto textile substrates via gravitational sedimentation. Precise control over the nanosphere size directly determines the final primary-color output. However, excessive differences in the particle size between nanospheres can lead to poor color saturation. To optimize the low saturation resulting from mixed nanospheres, the process for producing high-saturation structural-color textiles based on multicomponent nanosphere synergy was refined by incorporating carbon black (CB) and introducing a fourth SiO2 nanosphere size that exhibits yellow color. Furthermore, to enhance the practicality of the nanostructured-color layer, a waterborne polyurethane (WPU) solution was introduced to strengthen the adhesion of the SiO2 nanospheres to the textile surface. This significantly improved the color fastness and color stability of the fabrics while preserving the integrity of the nanoscale structural arrangement of the SiO2 nanospheres. The developed nanoscale structural-color coatings exhibit promising application potential in eco-friendly nanocomposite materials and optical anticounterfeiting based on nanophotonic effects.

The ultimate goal of this article is producing on industrial scale antimicrobial nonwoven fabrics based on polyamide-6 (PA-6) fibers for medical and intelligent packaging applications. Therefore, the adaptation and development of pilot scale conditions for imparting PA-6 textile materials antimicrobial properties is highly needed. The effect of semi-industrial scale finishing conditions, mainly antimicrobial substrate concentration, duration and temperature on the (%) of colony forming unit (CFU) reduction after treatment with alkaline aqueous solutions of quaternary ammonium salt definitely dimethylalkylbenzyl ammonium chloride (DMABAC) was examined. The antimicrobial activity of PA-6 fibers finished with DMABAC against Gram-positive (Staphylococcus aureus), Gram-negative (Escherichia coli), and nonfilamentous fungus (Candida albicans) was investigated using the shake flask method. Antimicrobial activity of produced PA-6 nonwoven fabrics was appeared outstanding antimicrobial activities as follow: needle punched nonwoven fabrics were 95% Bacillus mycoides, 91% Escherichia coli, and Candida albicans 88.5%, respectively. While air laid nonwoven fabrics were 92.3 %, 89.7% and 85.3%, respectively. The achieved antimicrobial functions on the PA-6 nonwoven fabrics are durable with repeated laundering processes even after five washing cycles. Accordingly, the improvement antimicrobial properties of these fibers was important for a wider range of industrial applications including medical mattresses and ventilation sectors.

The paper highlights a stretchable, wash-durable and wearable smart textile-based Joule heater with high thermal stability.

Abstract The behavior of an oxide fiber at elevated temperatures was analyzed before and after thermal exposures. The material studied was a mullite fiber developed for high‐temperature applications, CeraFib 75. Heat treatments were performed at temperatures ranging from 1200°C to 1400°C for 25 hours. Quantitative high‐temperature X‐ray analysis and creep tests at 1200°C were carried out to analyze the effect of previous heat treatment on the thermal stability of the fibers. The as‐received fibers presented a metastable microstructure of mullite grains with traces of alumina. Starting at 1200°C, grain growth and phase transformations occurred, including the initial formation of mullite, followed by the dissociation of the previous alumina‐rich mullite phase. The observed transformations are continuous and occur until the mullite phase reaches a state near the stoichiometric 3/2 mullite. Only the fibers previously heat treated at 1400°C did not show further changes when exposed again to 1200°C. Overall, the heat treatments increased the fiber stability and creep resistance but reduced the tensile strength. Changes observed in the creep strain vs . time curves of the fibers were related to the observed microstructural transformations. Based on these results, the chemical composition of the stable mullite fiber is suggested.

ABSTRACTRecent accomplishments in the cyclopolymerization of α,ω-diynes by tailored Ru- and Mo-alkylidenes are reported. Special emphasis is put on the extent and origin of both stereo- and regioselectivity with the different initiator systems used. Particularly, the very recently developed molybdenum imido alkylidene N-heterocyclic carbene (NHC) complexes are of utmost interest since they allow for the cyclopolymerization of α,ω-diynes bearing protic functional groups such as hydroxyls and carboxylic acids and therefore rival Ru-alkylidenes both in terms of regio- and stereoselectivity but also in terms of activity and functional group tolerance.

Abstract Two hexagonal series of lanthanoid(III) oxide fluoride selenides with similar structure types can be obtained by the reaction of the components MF3, M2O3, M, and Se in sealed niobium tubes at 850 °C using CsI as fluxing agent. The compounds with the lighter and larger representatives (M = La – Nd) occur with the formula M6O2F8Se3, whereas with the heavier and smaller ones (M = Nd, Sm, Gd – Ho) their composition is M2OF2Se. For both systems single‐crystal determinations were used in all cases. The compounds crystallize in the hexagonal crystal system (space group: P63/m) with lattice parameters of a = 1394–1331 pm and c = 403–372 pm (Z = 2 for M6O2F8Se3 and Z = 6 for M2OF2Se). The (M1)3+ cations show different square antiprismatic coordination spheres with or without an extra capping fluoride anion. All (M2)3+ cations exhibit a ninefold coordination environment shaped as tricapped trigonal prism. In both structure types the Se2– anions are sixfold coordinated as trigonal prisms of M3+ cations, being first condensed by edges to generate trimeric units and then via faces to form strands running along [001]. The light anions reside either in threefold triangular or in fourfold tetrahedral cationic coordination. For charge compensation, both structures have to contain a certain amount of oxide besides fluoride anions. Since F– and O2– can not be distinguished by X‐ray diffraction, bond‐valence calculations were used to address the problem of their adjunction to the available crystallographic sites.

The regio- and stereoselective cyclopolymerization of a series of 1,6-heptadiynes and 1,7-octadiynes, i.e., of 4,4-bis(ethoxycarbonyl)-1,7-heptadiyne (M1), 4-ethoxycarbonyl-4-(1R,2S,5R)-(−)-menthyloxycarbonyl-1,6-heptadiyne (M2), (R,S)-4,5-bis((1R,2S,5R)-(−)-menthyloxymethylcarboxymethyl)-1,7-octadiyne (M3), and (S,S/R,R)-4,5-bis((1R,2S,5R)-(−)-menthyloxymethylcarboxymethyl)-1,7-octadiyne (M4), by the action of the molybdenum–imidoalkylidene N-heterocyclic carbene (NHC) complexes (Mo(N-2,6-Me2C6H3)(CHCMe2Ph)(OTf)2(IMesH2) (I1), Mo(N-2,6-Me2C6H3)(CHCMe3)(OTf)2(IMesH2) (I2), (Mo(N-2,6-Me2-C6H3)(CHCMe2Ph)(OTf)(OCH(CF3)2)(IMesH2) (I3), Mo(N-2,6-Cl2C6H3)(CHCMe3)(OTf)2(IMes) (I4, IMesH2 = 1,3-dimesitylimidazolidin-2-ylidene, IMes = 1,3-dimesitylimidazolin-2-ylidene) and by the molybdenum–imidoalkylidene monoaryloxide monopyrrolide (MAP) complexes Mo(N-2,6-iPr2-C6H3)(CHCMe2Ph)(2,5-Me2-pyrrolide)(O-2,6-Me2-C6H3) (MAP1), Mo(N-2,6-iPr2-C6H3)(CHCMe2Ph)(2,5-Me2-pyrrolide)(O-2,6-Mes2-C6H3) (MAP2), and Mo(N-2-tBu-C6H4)...

We performed first-principles calculations to study the structural stability of Si78 clusters with or without hydrogen passivation. The calculations reveal that an endohedral double cage isomer is more stable than the diamond-like structure, whereas the opposite is found for the hydrogen passivated isomers. In particular, the hydrogenated double cage and diamond-like structure may display blue shifts to the visible and UV regions, respectively. The IR vibration spectra, ionization potential (IP) and electronic density-of-states of the clusters were calculated and discussed.