Additive manufacturing of shape memory polymers has gained tremendous interest in recent years due to their versatile potential applications various industries, such as biomedicine and aerospace. However, the polymers' mechanical properties, specifically stiffness strength, often hinder use mechanically demanding applications, e.g. structural materials. In this work we produced nacre-inspired composites with a covalent adaptable network, which enables fast lossless self-healing, reshaping,...

MoS2 is a 2D semiconductor where exfoliation to single layer results in improved catalytic properties. However, its high surface energy can lead extensive aggregation, resulting degraded performance and stability. Combined with lack of dispersibility water, this represents pitfall for catalysis the aqueous phase. Herein, we present use nanoscopic layered silicates pillared cationic surfactant template growth interlayer space. This provides heterostructured nanoparticles ∼25 nm wide by 3–8...

Structural colors offer a myriad of advantages over conventional pigment-based colors, which often rely on toxic chemical substances that are prone to UV degradation. To take advantage these benefits in demanding environments, there is growing interest producing structural from ceramics. Polymer-derived ceramics (PDCs) emerge as compelling choice, presenting two distinct advantages: their enhanced shape ability polymeric state associated with impressive temperature resistance once converted...

In this work, powder compaction and solid-state sintering are employed to fabricate iron-based self-lubricating composites containing MoS2 graphite. Previous studies have shown that reacts with iron matrices during sintering, making the production of Fe-MoS2 challenging. We hereby demonstrate a modification in atmosphere improves composites' tribological properties due synergic effect retardation reaction increase matrix microhardness related nitrogen intake. The sintered mixed Ar/H2/N2...

A process for generating highly porous α-Al2O3 ceramics has been developed. In this paper, a combination of self-assembly and atomic layer deposition is demonstrated as means to fabricate inverse alumina opals, which have their structures transformed via sintering. The resulting structure stable even after 4 h dwell time at 1400 °C, in contrast generated by conventional powder metallurgy, sol-gel or colloidal suspension infiltration methods. TEM analysis reveals that the consists single...

In the present paper, an analysis of stability MoS2 compound in 17-4 PH stainless steel matrix during sintering powder injection moulded samples is presented. A feedstock containing 10% vol. solid lubricant phase MoS2, mixed with was prepared and injected. The carried out at various temperatures ranging from 650°C to 1,300°C. progress dissociation process as a function temperature formation new phases were analyzed via X-ray diffraction. microstructure resulting material by SEM/EDS. As...

Photonic materials for high-temperature applications need to withstand temperatures usually higher than 1000 °C, whilst keeping their function. When exposed high temperatures, such nanostructured are prone detrimental morphological changes, however the structure evolution pathway of photonic and its correlation with loss material's function is not yet fully understood. Here we use high-resolution ptychographic X-ray computed tomography (PXCT) scanning electron microscopy (SEM) investigate...

Angle independent non-absorbing spectral filters are required for many applications such as sunscreens, structural colors, photovoltaics, and radiative cooling. One of the promising simple to manufacture structures is based on disordered arrangement monodisperse spherical particles by self-assembly, also called photonic glasses. So far, reported glasses inherently show poor selectivity with a smooth transition in reflection. No significant improvement usually expected from optimization Mie...

To translate the exceptional properties of colloidal nanoparticles (NPs) to macroscale geometries, assembly techniques must bridge a 10 6 ‐fold range length. Moreover, for successfully attaining final mechanically robust nanocomposite material, some intrinsic NPs’ have be maintained while minimizing density strength‐limiting defects. However, nanoscale building blocks into macroscopic dimensions, and their effective properties, are inherently affected by precision conditions required...

The high-temperature stability of thermal emitters is one the critical properties thermophotovoltaic (TPV) systems to obtain high radiative power and conversion efficiencies. W HfO2 are ideal due their melting points low vapor pressures. At temperatures given vacuum conditions, prone oxidation resulting in instantaneous sublimation volatile oxides. Herein, we present a detailed in-situ XRD analysis morphological changes 3-layer-system: HfO2/W/HfO2 layers, environment, up 1520 °C. These...

Abstract Atomic layer deposition (ALD) process presents thickness control in an Ångstrom scale due to its inherent surface self‐limited reactions. In this work, ALD super cycle approach, where a superposition of nanolaminates SiO 2 and Al O 3 is generated by cycling the precursors APTES–H O–O TMA–H O, used deposit thin films with varying ratio :SiO into silicon wafers inverse photonic crystals. The resulting ternary oxide deposited at low temperature (150 °C) are amorphous. However,...

Copper is a well know material for use as heat sink or exchanger. However, copper has considerable low tensile strength and temperature limit. A that good thermal conductivity, cost, but also resistance the desired. Effects of on sintering properties iron-copper composites produced by powder metallurgy Fe copper-iron have been investigated. iron were varied from 20 to 80 vol.% in samples, alternating continuous phase. Sintering studies performed in-situ dilatometry aiming define proper...

To substitute conventional pigments, which often are toxic or suffer from fading in ultraviolet light, non-iridescent structural colors should demonstrate high spectral selectivity, while being also mechanically stable. However, photonic glass (PhG) shows low color saturation due to the gradual transition reflection spectrum and mechanical stability weak interparticle attachment. Here, a PhG with sharp comparison full sphere is designed by conformal coating via atomic layer deposition (ALD)...

A process to fabricate structures on inclined substrates has the potential yield novel applications for colloidal-based structures. However, conventional techniques, besides coffee ring effect (CRE), anisotropic particle deposition along inclination direction (IE) is expected occur. We hypothesize that both effects can be inhibited by reducing dispense volume during printing direct writing. combined an additive manufacturing technique, namely writing, with colloidal assembly (AMCA) automated...

TiO2 thin films deposited by atomic layer deposition (ALD) at low temperatures (<100 °C) are, in general, amorphous and exhibit a smaller refractive index comparison to their crystalline counterparts. Nonetheless, low-temperature ALD is needed when the substrates or templates are based on polymeric materials, as has be performed below glass transition melting temperatures. This case for photonic crystals generated via infiltration of self-assembled polystyrene templates. When heated up,...

Powder metallurgy is a growing sector in industrial production, as it offers outstanding energy, cost and material savings comparison with established processing routes such casting. Hot work toll steels are usually produced by ingot metallurgy, but also powder namely hot isostatic pressing forging routes. In this paper we investigate the possibility of production tool steel (AISI H13) conventional (die compaction pressureless sintering) metal injection molding routes, aiming to reduce time....

To obtain high-quality homogeneous photonic glass-based structural color films over large areas, it is essential to precisely control the degree of disorder spherical particles used and reduce crack density within as much possible. tailor quality glasses, a heteroaggregation-based process was developed by employing two oppositely charged equal-sized polystyrene (PS) particle types. The influence size ratio on extent heteroaggregation in suspension mixes investigated correlated with both...

Abstract Three‐dimensionally ordered macroporous materials for photonic or refractory applications have been developed by an innovative approach based on mullite sol‐gel infiltration of direct crystals followed burn‐out and calcination. Direct were obtained using polystyrene spheres templates either vertical convective self‐assembly drop casting. The samples then infiltrated spin coating with sol‐gels prepared two different compositions (74 wt.% Al 2 O 3 , 26 SiO 80 20 ). inverse opal both...