Search

[Display omitted] • A bionic pattern of honeycomb and cactus spines coupling (BPHCSC) was designed. • The fog collection efficiency of BPHCSC enhanced by 23.5%. • Circular, triangular, and rectangular pattern were designed on the basis of BPHCSC. • A directional fog collection device was designed on the basis of BPHCSC. Fog collection has become one of the effective means to solving water scarcity. Wettability-mixed patterned surfaces exhibit great potential in fog collection. In this article, the desert beetle, honeycomb structures and cactus spines served as an inspiration in the proposal of a bionic pattern of honeycomb and cactus spine coupling (BPHCSC) that can efficiently collect fog. First, a superhydrophobic (SHB) surface was successfully prepared on the surface of 5052 Al alloy through combined electrochemical etching with fluorosilane modification. Subsequently, laser etching technology was used in the precise etching of a superhydrophilic BPHCSC on the SHB surface. Compared with the fog collection efficiencies of a single SHB surface and the honeycomb-like wettability-mixed patterned surface composed of rectangular channels, that of the prepared BPHCSC surface increased by approximately 23.5% and 4.27%, respectively. In addition, a thorough exploration was conducted on the effects of factors, such as the distance between the sample surface and the fog outlet, tilt angle and the number of laser etchings, on fog collection efficiency. This study provides a new idea for fog collection and exhibits a broad application potential in fields, such as microfluidic systems, droplet manipulation and cell screening. [ABSTRACT FROM AUTHOR]

[Display omitted] • Flexible, air-permeable, and conductive non-woven silk fabric (nSF) was prepared. • A TPU-based honeycomb microporous structure was constructed within the silk fibers. • The conductive silk fabric shows stable humidity response and thermal response. • The conductive silk fabric displays reliable strain sensing ability. • The silk fabric shows effective EMI shielding performance and Joule heating management. Silk-based conductive composites have attracted much attention for applications in flexible smart electronics. However, silk-based conductive composites that combine high air permeability, Joule heat management, electromagnetic interference (EMI) shielding and multimodal responsiveness are still challenging. In this paper, flexible porous non-woven silk fabric (nSF)-based conductive composites with the aforementioned properties are designed and developed by a freeze-induced assembly and surface micro-dissolution adhesion (FASMA) process to introduce carbonyl carbon nanotubes (C-CNTs), MXene and thermoplastic polyurethanes (TPU) into the inter-fiber network structure of nSF, with the aim of constructing a high-performance multimodal sensing platform. Functioning as a flexible strain sensor, the nSF-based composite can detect strains as low as 0.05 % with rapid response and recovery time of 125 ms and 146 ms, respectively, and can be used to detect full-size human motion signals. The nSF-based composite has a good humidity response at 0–85 % relative humidity (RH) and a sensitive and reliable thermal response. In additionally, the nSF-based composites also have Joule heat management and EMI shielding functions. All these multi-functional applications demonstrate the advantages of the prepared flexible porous nSF-based composites in the field of flexible smart electronics. [ABSTRACT FROM AUTHOR]

[Display omitted] • In situ FZC honeycomb spheres for cellulase direct adsorption and immobilization. • ZIF-8 components of the carrier regulate secondary structure of cellulase. • Thermal activation of immobilized enzyme was reported. • Application of immobilized cellulase in biomass saccharification. This paper presents a promising heterogeneous biocatalyst-immobilized cellulase system, which can facilitate the targeted catalytic conversion of biomass to reducing sugars. Magnetic Zeolite Imidazole Framework-8/chitosan (Fe 3 O 4 /ZIF-8/CS, FZC) hybrid honeycomb microspheres were synthesized to immobilize cellulase using an in-situ growth strategy. The enhancement of immobilization efficiency induced by each constituent of the composite carrier was explored. This exploration was grounded in varying combinations of components within the honeycomb composite spheres, revealing the indispensability of ZIF-8. Through in-situ assembly, the composite material presents a microsphere with an internal honeycomb structure and multilevel pores. Effective immobilization, temperature-responsive conformational change, and cyclic stability were achieved due to the scaling effect of the channel, extensive specific surface area, and abundant amino group interactions enable immobilized enzymes to maintain excellent performance under challenging operating conditions, demonstrating an enhanced structure-performance relationship. With the obtained immobilized cellulase, we achieved a high load (461.67 mg/g) of cellulase and a significant reducing sugar yield (328.39 mg/g) from corncob waste. In addition, we investigated the enhancement effect of thermal activation on the immobilized enzyme activity of composite carrier. The results showed that the appropriate heat treatment was conducive to the activation of FZC immobilized enzyme with a reducing sugar yield 1.61 times higher than that of the control. The strategy provided in this study promotes the development of immobilized biocatalysts and provides a useful reference for the further design of biocatalytic systems. [ABSTRACT FROM AUTHOR]

[Display omitted] • Bioinspired design was used to ceramic materials via DIW technique. • Polysilazane (PSZ) based ceramic materials were printed by DIW 3D printing. • B 4 C-based honeycomb ceramic 3D structures were printed by PSZ/B 4 C ink. • B 4 C-based honeycomb ceramic was impregnated by epoxy resin for armor structures. B 4 C ceramic holds enormous application potential in the lightweight armors. In order to simplify the design of armor materials, 3D printed B 4 C-based honeycomb ceramic via DIW technique with high solid content were fabricated using printing ink with B 4 C powder, BYK-2070 dispersant, BAC solvent, PSZ adhesive and DCP cross-linking agent. The role of each constituent and the printing parameters of such honeycomb ceramic were investigated. In addition, epoxy resin was employed to impregnate PSZ-modified B 4 C-based honeycomb ceramic to prepare three-dimensional structure hybrid composites with excellent mechanical strength (172 MPa of flexural strength, 4.95 KJ/m2 of impact strength) and physiochemical properties (7.52 % of open porosity, 5.5 % of water absorption, 1.35 g/cm−1 of density, and 5.2 GPa of hardness). The exceptional performances of the three-dimensional structure hybrid composite come from the bioinspired structure design, new chemical bonds (such as the formation of B–C, C–N and Si–B bonds) formed in the ceramic material and cross-linking reaction occurred during curing between epoxy resin and PSZ. The findings in this study provide an effective strategy for the fabrication of B 4 C-based composites with controllable structures and mechanical performances and exhibit the potential application in complex armor structures. [ABSTRACT FROM AUTHOR]

In our manuscript, the assembly of micron and nanoscale structures was combined by laser etching hexagonal honeycomb-mounted micropores combined with hydrothermal growth of pine-needle-like ZnO, which relied on the capillary action of the micropores and the stabilizing mechanical properties of the honeycomb structure to achieve the locking of the lubricant and improve its durability. [Display omitted] • A honeycomb-inspired multidimensional lubricant-infused surface was fabricated; • The fabricated surface has a good ability to lock in lubricant; • The surface ensures excellent long-term lubrication performance; • The surface is able to rapidly coalesce and remove water droplets during condensation; • The surface retards the formation of ice. The slippery liquid-infused porous surfaces with nanostructures have emerged as a high-performance multifunctional surface with super-liquid repellency, low contact angle hysteresis and self-healing. However, the amount of lubricant captured by the nanostructures is extremely low, and such oil-filled functional surfaces are susceptible to lubricant loss depletion. In this research, we developed a honeycomb-inspired multidimensional lubricant-infused surface that has a good ability to lock in lubricant while providing excellent mechanical durability. The honeycomb-shaped hexagonal micropores store lubricant to stabilize the smooth oil layer, while the pine-needle shaped nano-needles in the pores retain the lubricant in the pores, making it more difficult to lose the lubricant and increasing durability. Compared to conventional nanostructured slippery liquid-infused porous surfaces, this surface ensures excellent long-term lubrication performance under extreme conditions such as cooling, high shear and water spray impact. Meanwhile the honeycomb mesh lubricant injected into the surface is able to rapidly coalesce and remove water droplets during condensation due to the presence of coarsening effect, and it also retards the formation of ice. This structure provides a new idea for anti-icing and water collection research [ABSTRACT FROM AUTHOR]

• PVA/CNF@14GO filled honeycomb composites at 30 mm achieve a broadband effective absorption performance of 13.25 GHz. • Honeycomb composites allows for broadband microwave absorption and enhanced structural strength. • The electromagnetic parameters of honeycomb composites can be precisely controlled. • The honeycomb composites were expected to be used for aviation stealth based on the light weight and broadband performance. Lightweight structural/microwave absorption (MA) integrated materials with broadband MA are urgently needed in the aerospace field. In this study, crosslinked PVA/CNF backbone-supported RGO foams were successfully filled into aramid honeycomb structures with significant broadband MA performance and structural enhancement properties through a synergistic strategy of chemical crosslinking, environmental drying and chemical vapor reduction. Flexible tuning of the electromagnetic parameters of the PVA/CNF@GO foam can be achieved by adjusting the number of GO parts. The 30 mm thickness of the PVA/CNF@14GO foam achieves a broadband effective absorption of 13.25 GHz, covering almost all C, X and Ku bands. Microstructural characterization and electromagnetic parameter tests proved that the uniform distribution of RGO was achieved with crosslinked PVA/CNF as the backbone, which resulted in less Debye relaxation and the construction of uniform conductive pathways. Therefore, the PVA/CNF@14GO-filled honeycomb not only enables the composite honeycomb to achieve broadband MA performance, but also achieves a compressive strength of 5.52 MPa, which is an improvement of 262.86 % with respect to that of the pure honeycomb. The obvious overlap of the CST power loss distribution and the electric field distribution region shows that the conductive loss and the 1/4 wavelength interference are the main paths for energy dissipation in the composite of the PVA/CNF@GO-filled honeycomb. The honeycomb-filled PVA/CNF@GO lightweight foams obtained in this chapter have good broadband microwave absorption properties and higher structural strength, which provide important design strategies and practical references for the development of high-performance MA-filled honeycomb structures. [ABSTRACT FROM AUTHOR]

[Display omitted] • The 3D honeycomb foam features a lightweight design, high strength and prominent heat transfer performance. • The composites achieve high out-of-plane thermal conductivity and low thermal resistance at a reduced filling load. • The excellent thermal conductivity is mainly due to the 3D phonon transmission network and the hydrogen bond interaction. • The composites combine outstanding mechanical performance, low dielectric properties and excellent insulation. Polymer matrix composites with excellent thermal management performance have emerged as remarkable materials in the realms of microelectronic devices and wireless communication technologies. However, achieving high thermal conductivity in most composites often requires a high filling load, which will compromise other desirable properties. Herein, utilizing physical foaming and vacuum infiltration methods, we introduce a 3D honeycomb composite consisting of surface-hydroxylated hexagonal boron nitride (OH-BN) and epoxy. The 3D OH-BN honeycomb foam in the composite features a lightweight design (0.33 g/cm3), high strength (7178 times its own weight) and prominent heat transfer performance. Significantly, these composites achieve notable thermal properties, including high through-plane thermal conductivity (2.073 W m−1 K−1) and relatively low thermal resistance (0.995 °C/W) at a reduced filling load (17.2 vol%). In comparison with pure epoxy, the through-plane thermal conductivity is enhanced by an impressive 894 %, while the thermal resistance is reduced to 1/9.4 of that observed in pure epoxy. Besides, the 3D honeycomb composites combine outstanding mechanical performance, low dielectric properties and excellent insulation, underscoring their potential in the field of thermal management applications in microelectronic devices, wireless communication systems and integrated circuits. [ABSTRACT FROM AUTHOR]

[Display omitted] • Self-Supporting Honeycomb Coaxial Carbon Fibers were prepared. • The utilization rate of nuclear layer electrocatalysts has been improved. • [Ni/C]@[MoC/C]-PCNFs can expose more active sites. • A carbon fiber has a confinement effect on nanoparticles. • Self-supporting catalyst avoids the use of adhesives to achieve excellent activities. The electrocatalytic reaction mainly occurs on the surface of the electrocatalyst, while the active substances inside the electrocatalyst do not participate in the catalytic reaction. Therefore, core layer electrocatalysts with coaxial structures face lower utilization rates and a significant decrease in the number of exposed active sites, which in turn affects the electrocatalytic activity. Here, a novel one-dimensional (1D) honeycomb coaxial carbon nanofibers with MoC shell and Ni core layer (denoted as [Ni/C]@[MoC/C]-PCNFs) have been successfully prepared by pyrolysis of coaxial precursors fibers of [Ni(acac) 2 /PAN/PS]@[MoO 2 (acac) 2 /PAN]. The core layer of [Ni/C]@[MoC/C]-PCNFs) has a multi-channel honeycomb-like structure due to the pyrolysis of PS. The specific surface area of [Ni/C]@[MoC/C]-PCNFs (143.1 m2g−1) is more than twice that of the coaxial fibers with solid core structures (denoted as [Ni/C]@[MoC/C]-CNFs, 60.2 m2g−1). Simultaneously, the heterostructure formed between MoC and Ni, allowing for the adjustment of the electronic structure, acceleration of electron transfer and optimization of the electrocatalytic HER performance. The optimized self-supporting [Ni/C]@[MoC/C]-PCNFs exhibit the best catalytic activity for HER in both alkaline and acidic solutions, requiring only 84 and 160 mV to drive a current density of 10 mA cm−2. In addition, [Ni/C]@[MoC/C]-PCNFs catalyst exhibits good stability in both acidic and alkaline electrolytes. This core layer multi-channel coaxial structure designing provides an effective strategy for improving the electrocatalytic performance of catalysts. [ABSTRACT FROM AUTHOR]

• A honeycomb-structured superhydrophobic coating is prepared. • The coating exhibited a high visible light transmittance (90.0%). • By regulating structure, the haze of the coating can be adjusted (8.9%-54.1%). • The coating has excellent mechanical abrasion and weathering resistance. Transparent superhydrophobic coatings have excellent self-cleaning performance and are particularly suitable for applications in the fields of outdoor photovoltaic displays, solar power generation, and windows. However, the micro-nanostructures required for superhydrophobic coatings make them poor abrasion-resistant and foggy, and hence transparent superhydrophobic coatings with good practicality still remain great challenging. Here, we report honeycomb-structured coatings simultaneously with high transparency, abrasion-resistance and superhydrophobicity by fabrication of honeycomb epoxy resin structure via PDMS template method and subsequent spraying of hydrophobic SiO 2 nanoparticles. The coatings with different honeycomb structures exhibit average transmittance of 90.0 %, and the haze in the range of 8.9–54.1 %. Both the honeycomb structure formed by hard epoxy resin and strong adhesion of hydrophobic SiO 2 nanoparticles enable the coatings to maintain superhydrophobicity after harsh mechanical abrasion and weathering. [ABSTRACT FROM AUTHOR]

• Honeycomb-like porous paper platform obtained by the laser direct writting. • Simultaneous and accurate monitoring physical and chemical index during exercise. • Exceptional sensitivity (68 mV pH-1) by confined enrichment from cellulose. • On-demand analysis of sweat by joule heating from conducting polymers. Paper-based wearable sensors have gained significant attention in sweat analysis due to their widespread availability, comfortable wearability, and hygroscopic behavior. However, integrating functional components such as the conducting polymers in one sensor to realize the simultaneous and on-demand detection for the physical and chemical indexes compromises their stable performance under operation due to mismatch among various functional parts. We report a stable, multifunctional, and scalable paper-based flexible sensing platform for improved performance for in-situ sweat stimulating and analyzing of sweat as well as the monitoring of body motion. The welded honeycomb structure of composite paper formed in direct laser writing can provide a reversible and precise response in resistance during bending. The internal confined space containing the bacterial cellulose can induce an electrostatic enrichment of hydrogen ions in sweat, thus enhancing the pH-sensing sensitivity (68 mV pH-1). This spatial separating design for the two detections can further isolate the interfering, thus enabling the simultaneous and highly sensitive analysis of pH and movement. In addition, the controlled joule heating effect and the nano-fluid channels of the papers can help generate and rapidly transfer the sweat, further facilitating an on-demand and rapid responsive detection. [ABSTRACT FROM AUTHOR]

[Display omitted] • A robust Co 3 O 4 @NC/honey ceramics catalyst with porous structure was fabricated. • It can effectively oxidize and degrade HCHO in indoors air into CO 2 and H 2 O. • DOM, formate and carbonate species are the main intermediates during HCHO oxidation. • More pyridine N, surface Co3+ and V O result in its excellent catalytic performance. • Mechanism for HCHO oxidation at room temperature was proposed. The content of surface cobalt active sites and oxygen vacancy (V O) is vital to the catalytic performance of Co 3 O 4 catalysts. Herein, a robust Co 3 O 4 @N doped C supported on honeycomb ceramics (Co 3 O 4 @NC-HC) catalyst with porous structure was prepared by an impregnation-calcination method using ZIF-67 as the precursor. The N 2 calcining atmosphere and relatively closed environment are beneficial for the formation of more pyridine N, Co3+ surface active sites, and V O , which favors formaldehyde (HCHO) or O 2 adsorption and activation. The higher content of NC in Co 3 O 4 @NC-HC than in Co 3 O 4 @NC-HC-open and Co 3 O 4 @NC-HC-air can disperse Co-containing catalysts better and promote electron transfer. The Co 3 O 4 @NC-HC catalysts exhibited excellent activity and stability for HCHO oxidation at room temperature. The 1.0 Co 3 O 4 @NC-HC sample with theoretical 7.7 wt% showed the maximum efficiency (96.5 %) for HCHO removal. The related catalytic mechanisms over Co 3 O 4 @NC/HC for HCHO oxidation were posed. [ABSTRACT FROM AUTHOR]