Search

Alkali lignin(AL) was separated and purified from papermaking black liquor by acidic precipitation. Then, quaternary ammonium lignin(QAL) was obtained by modifying AL with 3-chloro-2-hydroxypropyl trimethyl ammonium chloride. Using cellulose hydrogel (CEH) as matrix, antibacterial silver nanoparticles-quaternary ammonium lignin-cellulose hydrogel (Ag NPs-QAL-CEH) was prepared by impregnating with QAL and silver nitrate solutions. The structures of AL and QAL were characterized by Fourier transform infrared spectroscopy and the results showed that QAL was successfully prepared. The results of elemental analysis showed that the content of nitrogen increased from 0.6% to 5.9%. Ag NPs-QAL-CEH was characterized by X-ray diffraction and scanning electron microscopy. The results indicated that Ag NPs were obtained by reducing Ag+ with QAL, and Ag NPs-QAL was uniformly dispersed in the three-dimensional network structure of CEH. The antibacterial performance of the hydrogel showed that Ag NPs-QAL-CEH formed obvious inhibition zone against S. aureus and E. coli. Furthermore, with the increase of AgNO3 dosage, the diameters of antibacterial circle increased from 14.2 mm to 20.1 mm and 16.1 mm to 18.1 mm, respectively. When the mass concentration of AgNO3 was 7.87 g/L in 50 mL QAL solution(including 2.5 g QAL), the obtained Ag NPS-6-QAL-CEH had the best bacteriostatic effect, and the inhibitory rates against S. aureus and E. coli could reach more than 99.5%. [ABSTRACT FROM AUTHOR]

The bonding of textiles and surface coatings was often assisted by the use of chemical cross-linking agents. Inspired by mussel chemistry, we propose that the strategy of co-assembly of quinone compound (dopamine, DA) and amino compound (polyethyleneimine, PEI) to form amino-quinone network (AQN) coating can effectively solve the problem. In this work, the molecular weight of PEI was used to regulate the surface coating morphology and its properties on cotton fabrics.The results showed that the roughness (Ra) of AQN coatings formed on the surface of glass slides by DA and low, medium or high molecular weight PEI were 3.94, 24.1 or 71.4 nm, respectively. In addition, the antibacterial rates of AQN-coated cotton fabric against E. coli and S. aureus were above 98 %, and the ultraviolet protection factor (UPF) value was above 50. After several washes, the antibacterial and UPF values only decreased by about 1 %, which indicates that AQN coating gives cotton fabric good antibacterial and UV protection properties, as well as strong bonds with cotton fabric.This provides insight into the wide application of AQN coating technology in the field of textile modification. [Display omitted] • First study on the effect of molecular weight of amino compounds on amino-quinone network (AQN) coatings • AQN coatings were constructed without the use of chemical crosslinkers. • AQN coated cotton fabric had excellent UV protection and antibacterial properties. [ABSTRACT FROM AUTHOR]

Nowadays, the applications of nanoparticle-decorated textiles for environmental governmental governance have aroused great concerns, while the poor fastness and uncontrolled aggregation of the nanoparticles negatively influenced its practical use. Herein, an environmental-friendly synthesis strategy of water-dispersible MnO 2 was demonstrated by using the reductant of 2-(N-morpholino) ethanesulfonic acid (MES) and template of cetyltrimethylammonium bromide (CTAB), and then the as-prepared MnO 2 was further employed as a multifunctional textile coating. In all the procedures under room temperatures, three effects of cationic CTAB micelles were thoroughly explored, from optimizing MnO 2 to uniform micro/nanoscale through template strategy, to bridging the gaps between electronegative particles and fabrics, and even providing stable antibacterial effect. Consequently, without any additional binding agents, multifunctional cotton textile was obtained by simply immersing cotton into a MnO 2 -CTAB aqueous solution, and appeared antibacterial rates (over 99 %) to both E. coli and S. aureus. Meanwhile, HCHO removal and ultraviolet blocking (UVA<0.1 %) properties as well as high durability of the nanoparticles are also introduced to the textiles. We believe as-presented cationic surfactant-templated strategy for regulating synthesis and deposition of functional particles onto cotton textiles has broad application prospects in green and sustainable functionalization of decoration textiles. [Display omitted] • Cationic surfactant-guided synthesis of water-dispersible MnO 2 is initiated by MES. • MnO 2 nanoparticles endow cotton with encouraging ability to remove indoor HCHO. • CTAB enhances binding fastness by bridging gaps between nanoparticles and fibers. • Antibacterial and UV-blocking abilities are added to cotton under mild conditions. [ABSTRACT FROM AUTHOR]

Textiles with efficient moisture management provide a comfortable microenvironment for human body. However, little attention has been paid to sweat-induced bacterial growth alongside. In this study, chitooligosaccharide (COS) was used to modify lysozyme (Lyz-COS) to obtain more excellent antibacterial activity. Lyz-COS could undergo an amyloid-like aggregation by reducing its disulfide bond and hydrogen bond triggered by thiourea dioxide (TD). The Phase-Transited Lyz-COS (PTL-COS) coating increases the hydrophilicity and antibacterial properties of wool fabrics, which can withstand 50 washing cycles and 100 rubbing cycles. In addition, two methods are proposed to customize Janus wool fabrics as desired. Method 1: The PTL-COS film was prepared first, and then the film was transferred to one side of the wool fabric. Method 2: Simply spray the PTL-COS solution on one side of the wool fabric. These two processes are simple to operate and can be customized on demand, enabling single transport of sweat and inhibiting sweat-induced bacterial growth. This work underlines the significance of chitooligosaccharide-modified PTL coatings for functionalization of textile surfaces and provides new insights into the development of more adaptable and smarter textiles and clothing. • COS modified lysozyme to improve the antibacterial and hydrophilic properties of PTL-COS coating. • New process for preparing Janus wool fabrics using PTL-COS bio-based coating is proposed. • The PTL-COS coating can customize functional textiles with different properties as required. • The PTL-COS coating optimally couples durable antibacterial and moisture management properties. • The Janus wool fabrics still maintain excellent water vapor transmission rate and breathability [ABSTRACT FROM AUTHOR]

Functional textiles with antibacterial properties and UV protection are essential for human health. However, the process of functional modification of textiles is usually done with the help of chemical cross-linking agents to improve the bonding fastness of functional finishing agents on textiles. The use of chemical cross-linking agents is not eco-friendly enough and is prone to chemical waste. In this study, some highly reactive polyamine biomolecules were combined with dopamine quinone, a super adhesive bionic material, to spontaneously construct amino-quinone networks (AQNs) coatings on the surface of cotton fabrics without the addition of chemical crosslinkers. The amino/quinone compounds (A/Q) self-crosslinking reaction is achieved by Michael addition and Schiff base reaction between the quinone group in dopamine quinone and the amino group in chitosan (CTS), chitooligosaccharide (COS) or ԑ-polylysine (ԑ-PL). The combination of polyamines and dopamine quinone during the cotton finishing process imparts antibacterial and UV protection to cotton fabric. The results showed that the AQNs coating modified fabrics had superb UV protection and antibacterial rates of over 96% against both E. coli and S. aureus. In addition, the AQNs coating modified fabrics had good resistance to washing and mechanical abrasion. This study proposes that self-assembled amino-quinone network multifunctional coatings of dopamine quinone and polyamine biomolecules are of guiding significance for the development of environmentally friendly bio-based materials. [Display omitted] [ABSTRACT FROM AUTHOR]

The development of environmentally friendly multifunctional auxiliaries for textile modification is the focus of attention in textile industry in recent years. Polydopamine is an important biological macromolecule and widely used in biomedicine, nanomaterials, material surface modification and other fields. In this study, the novel multifunctional melanin-like nanoparticles (Nha-PDA NPs) were prepared and used for antibacterial, hydrophobic, and UV protective of textiles. Nha-PDA NPs were prepared with dopamine (DA) and n-hexylamine (Nha) by simple autoxidation copolymerization. Nha-PDA NPs were bound to the fabric surface through the PDA structure in Nha-PDA NPs that has been widely confirmed to have strong adhesion on the surface of many materials. The modified fabrics, Nha-PDA NPs@Cotton, had good hydrophobic, antibacterial and UV protective properties. The static water contact angles of the modified fabrics could reach 120°. The antibacterial rates of Nha-PDA NPs@Cotton against E. coli and S. aureus were above 85 %. The maximum UPF value of the modified cotton was 362, indicating that the ultraviolet protection performance was excellent. The fabric modified with multifunctional melanin-like nanoparticle provides a green way for the multifunctional modification of textiles. [ABSTRACT FROM AUTHOR]

Frequent oil spills and illegal industrial pollutant discharge cause ecological and resource damages, so it is necessary to establish efficient adsorption and recovery strategies for oils in wastewater. Herein, inspired by solar-driven viscosity-breaking, we propose a facile approach to fabricate multifunctional nanofibrillated cellulose-based aerogel with high elasticity, excellent photothermal conversion, efficient selective oil adsorption and antibacterial properties. Firstly, copper sulfide (CuS) nanoparticles were in situ deposited on the template of oxidative nanofibrillated cellulose (ONC), aiming at achieving efficient photothermal effect and antibacterial properties. Ethylene glycol diglycidyl ether (EGDE) was employed to establish multiple crosslinking network between CuS@ONC and polyethyleneimine (PEI). A thin hydrophobic PMTS layer deposited on the surface of aerogel via a facile gas-solid reaction ensured stable oil selectivity. The resulting composite aerogel can rapidly adsorb oil under solar self-heating, significantly reducing the adsorption time from 25 to 5 min. Furthermore, it exhibits excellent adsorption capacities for various oils, retaining over 92 % of its initial capacity even after 20 adsorption-desorption cycles, and the antibacterial properties extend its lifespan. This work offers a promising method for constructing multifunctional aerogels for efficient oil-water separation, especially beneficial for high-viscosity and high-melting-point oil cleanup. [Display omitted] • A solar-assisted self-heating cellulose-based aerogel adsorbent was constructed. • High-viscosity oil cleanup is rapidly driven by the photothermal aerogel. • Excellent self-absorption rate and capacity for different viscous oil are achieved. • CuS@CPEI-PMTS aerogel exhibits superior reusability, durability, and universality. • Stable hydrophobicity and compressibility are feasible under harsh conditions. [ABSTRACT FROM AUTHOR]

[Display omitted] • Wood-inspired strategy for constructing aerogel with directional structure is proposed. • Crude oil cleanup is rapidly driven by the capillary effect and solar energy. • Excellent self-absorption rate and capacity for highly viscous oil are achieved. • D-CuS@CP-PMTS aerogel exhibits superior reusability, durability, and universality. Frequent oil spills pose a serious threat to ecosystems, and rapid cleanup and recycling of oil spills are in high demand. Herein, inspired by natural wood structures and solar-driven viscosity-break, we developed a rapid oil-adsorption aerogel named D-CuS@CP-PMTS, which is dual-driven by capillary effect and solar energy. Briefly, copper sulfide (CuS) nanoparticles were rapidly in situ deposited on the template of oxidized nanofibrillated cellulose (ONC), aiming at achieving high photothermal effects. Subsequently, ethylene glycol diglycidyl ether (EGDE) was introduced to build multiple cross-links between CuS@ONC and polyvinyl alcohol (PVA), followed by fabricating an aerogel with directional channels for rapid oil transport using unidirectional freeze-drying technology. Finally, methyltrichlorosilane (MTS) was uniformly deposited on the aerogel using a gas–solid reaction to improve its hydrophobicity. The resulting composite aerogel achieved rapid oil adsorption with the dual assistance of solar self-heating and oriented channel structure, which significantly shortened the oil adsorption time (from 45 min to 2 min), companying with encouraging antibacterial effects. Meanwhile, rapid and repeated multiple adsorptions of high-viscosity crude oils and high melting point oils were achieved, which is superior to other reports. This work provides a new insight into adsorption and recycling of high-viscosity crude oil, and also broadens the potential application prospects of ONC-based aerogels. [ABSTRACT FROM AUTHOR]

[Display omitted] • The PTL provides a transparent and colorless coating with great advantages for the modification of textiles. • The PTL coating optimally couple durable super-hydrophilicity and antibacterial properties. • The coating can improve the moisture permeability of textiles and maintain the original breathability. • This strategy effectively provides a secondary reaction platform for the textile surface. Functional coatings with breathability, moisture permeability and antibacterial properties are extremely popular in textile applications. The secondary reactions of the surface coating are greatly important and have attracted attention since they can make the coating a multifunctional platform by customizing the surface characteristics. However, common coatings such as polydopamine are restricted in textile fuctionalization due to their undesired color. In this study, we developed an amyloid-like natural protein coating on wool textile based on the phase-transited assembly of lysozyme. It is found that this coating significantly improve the hydrophilicity and moisture permeability of wool fabrics, which can withstand 50 washing cycles and 100 friction losses. The coated fabric maintained antibacterial properties for a long time in a humid environment after soaked in simulated sweat. At the same time, we used phase-transited lysozyme (PTL) as the secondary reaction platform to generate silver nanoparticles (AgNPs) in-situ, which endows the fabric with excellent antibacterial properties. Interestingly, the finished fabric still maintains an excellent antibacterial rate after 50 washing cycles. This work shows that the secondary reactivity of the PTL assembly coating provides a facile and adaptable platform which is promising to realize diverse functionalization of textiles. It has overcome the color problem of commonly-used bionic coatings, thus providing new insights for the surface modification of other natural or synthetic fibers. [ABSTRACT FROM AUTHOR]