Introduction to Porous Coatings

LaNi5-based porous coatings were selected after thermal spray optimization and their electrochemical performance was evaluated in a 6M KOH electrolyte.

In conclusion, copper-titanium dioxide microporous coatings can be prepared by microarc oxidation, which can improve the biological activity and biocompatibility of titanium, promote new bone formation and demonstrate good osteoinductive properties.

ECR results on dense bars with porous coatings are also presented.

When the duration of UST of the initial suspensions is increased, the effective diffusion coefficients of the model biological fluid in porous coatings is decreased from 7.

Flow boiling heat transfer enhancement using porous coatings in microchannels has been experimentally investigated.

In the case of a 10 × 10 mm channel, the flame velocity in the porous channel was higher than the flame velocity in the solid channel after 350 mm only when using porous coatings with 2.

There were developed devices with porous coatings that can eliminate the appearance of cracks in the chambers and nozzles due to the powerful thermodynamic screen of three heat sources, and to arrange cutting of reinforced concrete structures with detonation high-temperature flares flowing from combustion chambers and nozzles cooled by capillary-porous coatings.

Here we focus on a newly designed family of mesoporous coatings based on zirconia (ZrO2) microstructure doped with gallium (Ga), exploiting its antibacterial and pro-osseo-integrative properties.

The authors consider the development of a mathematical design model of an infinite journal bearing lubricated with a lubricant with Newtonian rheological properties and a melt of a low-melting metal alloy covering the surface of the bearing bush, as well as a porous coating on the surface of the shaft, taking into consideration the dependence of the viscosity characteristics of the lubricant, the melt and the permeability of the porous coatings on the pressure with incomplete filling of the operating clearance.

However, an increment of salt content favoured the formation of porous coatings, which allowed the access of the electrolyte to the substrate leading to their rapid deterioration.

In the present study, the influence of structured capillary-porous coatings of surface on cryogenic quenching by the falling liquid nitrogen film is investigated.

The treatment led to an orderly secondary microporous coating containing HA nano-particles and evenly distributed BMP-2 in the porous coatings.

Porous coatings are actively used in engineering practice.

After sulfonation, microporous coatings including vTO particles were created on PI (PIST10 and PIST15) while microporous coating without vTO particles was also created on PI (PIS).

The obtained results proved that the surfaces of Ti6Al4V and Ti6Al4V covered by TiO2 nanoporous coatings, which were modified by titanate layers, promote apatite formation in the environment of body fluids and possess optimal biointegration properties for fibroblasts and osteoblasts.

Here, vertically oriented mesoporous coatings (MCs) with tunable surface properties and pore sizes have been developed via the single-micelle directing assembly strategy, which show good adsorption performances toward a wide range of organic pollutants.

For carrying out the high-technological processes in heat power installations the fragile capillary-porous coatings up to a limiting condition of heat exchange surface were researched.

In order to study the effect of porous coatings on the coupling between drag and vortex shedding frequency, these were measured when sandpaper coatings and splitter plates were applied instead of metallic foams.

Materials & methods: Magnesium (Mg)-doped titanium dioxide microporous coatings (Mg-TiO2) were prepared on the surface of Ti implants by plasma electrolytic oxidation.

Synthesis of TiO2 nanotube coatings, nanoporous coatings, and nanofibres by using titanium anodizing, microplasma electrolytic oxidation, and microwave-assisted hydrothermal synthesis in different regimes was studied.

Application of the method of layer-by-layer selective laser sintering of a metal powder for depositing capillary-porous coatings with a prescribed porosity onto heat-releasing surfaces is considered.

Through sulfonation reaction, microporous coatings of PEKK/SN composites were created on PEKK surface, which were integrated with PEKK substrate.

The limits of diff erent capillary-porous coatings are given.

Porous coatings on prosthetic implants encourage implant fixation.

In this paper, the Bruggeman’s two-phase model was used as a reference, and a five-phase model was developed to evaluate the thermal conductivity of porous coatings.

By fabricating channels in the microporous coatings which allows for the efficient releasing of the vapor, a significant enhancement is achieved both in CHF and in HTC, being more than four times greater than that for flat surfaces.

The findings of this study can pave the way for the quantitatively design of solute transport through microporous coatings and porous microfluidic membranes.

Furthermore, the polycrystalline nanoporous coatings we developed exhibit hydrophobic behaviour, with a static contact angle of 119°, and a contact angle hysteresis of 4.

This study supports that the meso‑porous coatings for building envelopes can significantly contribute to moderate the indoor thermal environment.

Testing results indicate that i) deposition technique is the most relevant parameter, ii) in presence of coatings, the performances are independent of the type of ferritic stainless steel substrate iii) nitriding helps to limit the outward chromium diffusion in case of porous coatings.

The final optimization has produced mesoporous coatings with ∼9 nm mean pore size, leading to an enhancement in transmittance up to 7.

It is found that the RVL films produce grainy and porous coatings on the substrate surfaces.

Usually, attenuation of a shock or detonation wave at a normal or tangential impact to the surface of technological structures can be carried out using porous coatings.

In this survey, micro–nanoscale coatings such as noble metals, ion implantation, rare earth oxides, lubricant-infused surfaces, polymers, nanostructured surfaces, carbon nanotubes, graphene, and porous coatings have been reviewed and discussed.

Measurements evaluated the effects of saturation temperature and two microporous coatings on heat transfer coefficients (HTC), critical heat flux (CHF), and boiling incipient superheat.

Improvements were noted in electrochemical properties achieved by the macroporous coatings, meanwhile in-vitro recording and stimulation performance favoured untemplated PEDOT/PSS as measured through signal-to-noise ratios and direct neuronal responses to biphasic stimuli, respectively.

Porous coatings on prosthetic implants encourage implant fixation.

The data analyses obtained from this investigation revealed similar bone responses between the porous coatings.

Plasma electrolytic oxidation (PEO), also known as microarc oxidation, is used to obtain the porous coatings on materials, such as aluminum, magnesium, titanium, niobium, zirconium, tantalum, and their alloys.

In general, fundamental understanding of radiation resistance of high surface density nanoporous materials and nanoporous coatings is severely lacking.

The relationship between structures and properties of room-temperature cold-sprayed ceramic coatings was described in respect to micro-nano dense and porous coatings.

The parameters of porous coatings are determined under which the detonation can be restored.

In this study, an improved finite element analysis-based model for SPME of volatile organic compounds (VOCs) by porous coatings was developed mainly focussing on the mass transport in coatings.

Large polymer binders (> 250 nm) reduce the coatings’ CPVC and lead to more porous coatings.

The aim of this work was to prepare and investigate the corrosion behavior of mesoporous silica layers hosting inhibitor molecules (1H-benzotriazole, BTA and cetyltrimethylammonium bromide, CTAB), which were impregnated into the porous coatings from their aqueous solutions.

Spectroscopic ellipsometry yields the refractive index of the resulting nano-porous coatings, which behave as lossy dielectrics in the UV-visible regime and loss-less dielectrics in the visible to infra-red (IR) regime; in this regime, the fairly high refractive index (≈1.

The essence of the method consists in the preventive deposition on the surfaces of construction objects of porous coatings that can irreversibly absorb aggressive substances.