Inherent poor stability of perovskite nanocrystals (NCs) is the main impediment preventing broad applications of the materials. Here, TiO2 shell coated CsPbBr3 core/shell NCs are synthesized through ...the encapsulation of colloidal CsPbBr3 NCs with titanium precursor, followed by calcination at 300 °C. The nearly monodispersed CsPbBr3/TiO2 core/shell NCs show excellent water stability for at least three months with the size, structure, morphology, and optical properties remaining identical, which represent the most water‐stable inorganic shell passivated perovskite NCs reported to date. In addition, TiO2 shell coating can effectively suppress anion exchange and photodegradation, therefore dramatically improving the chemical stability and photostability of the core CsPbBr3 NCs. More importantly, photoluminescence and (photo)electrochemical characterizations exhibit increased charge separation efficiency due to the electrical conductivity of the TiO2 shell, hence leading to an improved photoelectric activity in water. This study opens new possibilities for optoelectronic and photocatalytic applications of perovskites‐based NCs in aqueous phase.
TiO2 shell coated CsPbBr3 core/shell nanocrystals are successfully constructed, resulting in excellent water, photo and thermal stability. TiO2 shell coating effectively increases charge separation efficiency, hence leading to an improved photoelectric activity in water.
We developed a facile and widely applicable approach to fabricate multifunctional coatings by grafting functional polymer brushes on the silica-stabilized candle soot, which exhibited excellent ...near-infrared-activated biocidal ability and desired bioactivities such as antifouling property and controllable bioadhesion.
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•A facile method is developed for fabrication of a multifunctional coating based on candle soot (CS).•The coating exhibits excellent near-infrared-activated biocidal ability due to the inherent photothermal property of CS.•The coating shows desired biofunctions originated from the grafted polymers, which are enhanced by the nanoscale structure of CS.
Functional coatings with desired bioactivities are required for various biomedical applications. Candle soot (CS) composed of carbon nanoparticles has attracted significant attention as a versatile component of functional coatings because of its unique physical and structural characteristics. However, the application of CS-based coatings in the biomedical field is still limited due to the lack of modification methods that can endow them with specific biofunctionality. Herein, a facile and widely applicable approach to fabricate multifunctional CS-based coatings is developed by grafting functional polymer brushes on the silica-stabilized CS. The resulting coatings not only exhibited excellent near-infrared-activated biocidal ability (the killing efficiency was over 99.99 %) due to the inherent photothermal property of CS but also showed desired biofunctions (such as antifouling property or controllable bioadhesion; the repelling efficiency and bacterial release ratio were nearly 90 %) originated from the grafted polymers. Moreover, these biofunctions were enhanced by the nanoscale structure of CS. Because the deposition of CS is a simple substrate-independent process while the grafting of polymer brushes via surface-initiated polymerization is applicable to a wide range of vinyl monomers, the proposed approach can be potentially used for the fabrication of multifunctional coatings and would extend the applications of CS in the biomedical field.
Abstract The two leading causes of failure for joint arthroplasty prostheses are aseptic loosening and periprosthetic joint infection. With the number of primary and revision joint replacement ...surgeries on the rise, strategies to mitigate these failure modes have become increasingly important. Much of the recent work in this field has focused on the design of coatings either to prevent infection while ignoring bone mineralization or vice versa, to promote osseointegration while ignoring microbial susceptibility. However, both coating functions are required to achieve long-term success of the implant; therefore, these two modalities must be evaluated in parallel during the development of new orthopaedic coating strategies. In this review, we discuss recent progress and future directions for the design of multifunctional orthopaedic coatings that can inhibit microbial cells while still promoting osseointegration.
This review covers experimental results of evaporative lithography and analyzes existing mathematical models of this method. Evaporating droplets and films are used in different fields, such as ...cooling of heated surfaces of electronic devices, diagnostics in health care, creation of transparent conductive coatings on flexible substrates, and surface patterning. A method called evaporative lithography emerged after the connection between the coffee ring effect taking place in drying colloidal droplets and naturally occurring inhomogeneous vapor flux densities from liquid–vapor interfaces was established. Essential control of the colloidal particle deposit patterns is achieved in this method by producing ambient conditions that induce a nonuniform evaporation profile from the colloidal liquid surface. Evaporative lithography is part of a wider field known as “evaporative-induced self-assembly” (EISA). EISA involves methods based on contact line processes, methods employing particle interaction effects, and evaporative lithography. As a rule, evaporative lithography is a flexible and single-stage process with such advantages as simplicity, low price, and the possibility of application to almost any substrate without pretreatment. Since there is no mechanical impact on the template in evaporative lithography, the template integrity is preserved in the process. The method is also useful for creating materials with localized functions, such as slipperiness and self-healing. For these reasons, evaporative lithography attracts increasing attention and has a number of noticeable achievements at present. We also analyze limitations of the approach and ways of its further development.
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•Experimental results of evaporative lithography are reviewed.•Existing mathematical models of evaporative lithography are briefed.•Existing methods of evaporative lithography are classified.•Limitations of the approach and ways of its further development are analyzed.
The concept of thermoregulating textiles capable of providing personal thermal management property (PTM) has attracted significant attention in recent years. It is considered as an emerging approach ...to promote the comfort and general well-being of wearers and also to mitigate the energy consumption load for indoor living space conditioning. Regulating the heat exchange between human body and environment has been the core subject of many studies on introducing the PTM functionality to textiles. This work provides an overview of the latest literature, summarizing the recent innovations and state-of-the-art approaches of controlling the heat gain and loss of textiles. To this end, methods to control the fundamental aspects of heat gain and loss of fabrics such as using near-infrared reflective materials and conductive nanomaterials, designing photonic structures of fabrics, and engineering nanoporous structures for passive cooling and heating effects will be discussed. Moreover, specific attention is given to the application of phase change materials in textiles, their integration methods, and the associated mechanisms. Several commercial methods such as adapting the innovative designs, introducing moisture management capability, and using air/liquid thermoregulating systems will also be discussed. This review article provides a clear picture of the concept of thermoregulating textiles and recommends some future research trajectories for this emerging field.
•CaCl2 synergistically improves the efficacy of polyamidoamine flame retardants for cotton.•In horizontal flame spread tests polyamidoamine/CaCl2 coatings are very efficient.•In vertical flame spread ...tests polyamidoamine/CaCl2-treated cotton do not ignite.
The role of metal ions in improving the flame resistance of cotton prompted to investigate whether adding CaCl2 to the glycine-derived polyamidoamine M-GLY, an excellent intumescent flame retardant for cotton, increased its efficacy in this respect. Thermogravimetric analysis demonstrated a superior thermo-oxidative stability of cotton when treated with M-GLY/CaCl2 mixtures, particularly above 550°C, compared to cotton treated with either M-GLY or CaCl2, suggesting that they act synergistically. In horizontal flame spread tests, M-GLY/CaCl2 coatings proved to be even more efficient than M-GLY coatings. In vertical flame spread tests (VFSTs), where M-GLY failed to protect cotton even at add-ons >30%, M-GLY/CaCl2 coatings with add-ons 7% and 2%, respectively, inhibited cotton ignition producing only modest afterglow, and leaving an 82% residue. No other amino acid-derived polyamidoamine, except those containing disulfide groups, has proved as efficient in VFSTs, even at much higher add-ons. The set of data reported here prompts that the ionic interactions of calcium ions with the carboxylate groups of M-GLY induce the formation of even larger amounts of char compared to M-GLY and lets envisaging a synergistic action of these two components. This finding paves the way for the study of new polyamidoamine-based organic/inorganic flame retardants for cotton.
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•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.
Durable Icephobic Coating for Stainless Steel Boinovich, Ludmila B; Emelyanenko, Alexandre M; Ivanov, Vladimir K ...
ACS applied materials & interfaces,
04/2013, Letnik:
5, Številka:
7
Journal Article
Recenzirano
In this work, we present a modification of a stainless steel surface to impart superhydrophobic properties to it that are robust with respect to mechanical stresses associated with cyclic ...icing/deicing treatment, as well as to long-term contact with aqueous media and high humidity. The durability of the superhydrophobic state is ensured by the texture with multimodal roughness stable against mechanical stresses and a 2D polymer network of fluorooxysilane chemically bound to the texture elements. The designed superhydrophobic coating is characterized by contact angles exceeding 155° and a maximum rolling angle of 42° after 100 icing/deicing cycles.
•A natural pectin film was constructed on Zn anodes as a protective layer.•A unique hydrogen bond network endows pectin layer with excellent self-healing ability.•Pectin hydrogel layer possesses ...kinematic response ability from robust coordination forces.•Pectin protective film can sustain the complete structure and fit closely on Zn surface.•Zn@pectin symmetric cell can stably cycle for 2500 h at 2 mA cm−2 and 2 mAh cm−2.
Zinc (Zn) dendrite growth and hydrogen evolution corrosion reaction of Zn metal anodes greatly affect the cycling performance and hinder the commercial application of high safety aqueous Zn ion batteries. Building an excellent protective layer to perfectly solve the above problems is still a big challenge, resulting from its high-cost raw materials and complicated preparation processes. Herein, in this work, natural pectin biopolymer with galacturonic acid structure was adopted as a functional coating on Zn anodes (Zn@pectin) to realize the excellent cycling properties. Abundant oxygen-containing groups endow pectin films with self-healing ability and response kinematic via multiple intermolecular hydrogen bonds and ligand binding with Zn metal after in-situ gelation with Zn2+ ions, which can sustain the complete structure and fit closely on Zn surface to address the fracture and separation of protective layers with Zn electrode. Functional pectin coatings can serve as a physical barrier to reduce the corrosion effects of H2O molecules in aqueous electrolyte and regular the deposition behavior of Zn2+ ions to hamper the dendrite growth. Zn@pectin symmetric cell can stably cycle for 2500 h at a current density of 2 mA cm−2 and a constant capacity of 2 mAh cm−2. Zn-iodine full batteries possess the high capacity retention of 95 % after 4500 cycles at 1 A g−1. This work provides a new strategy for the protection of Zn metal anodes and realizes the resource utilization of renewable biomass.
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