Characterization of highly porous nanoparticle deposits by permeance measurements

Elmøe, Tobias Dokkedal; Tricoli, Antonio; Grunwaldt, Jan‐Dierk

doi:10.1016/j.powtec.2010.11.009

Cited by 13 publications

(6 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Before the two layer sections get into contact, the openings in the top layer are already significantly narrowed or even completely clogged, preventing thus a further deposition of the particles onto the glass substrate (see Supporting Information Figure S5). Our experimental observations are consistent with those found in a pressure-drop-driven particle-filtration/deposition model reported by Elmøe et al [29] However, in our work, the particle deposition is driven mainly by the high temperature-gradient between the gas flow and the water-cooled substrate, while in the model by Elmøe et al, no temperature-gradient was applied. Although there is no vertical flow of particle-laden gas through the substrate in our process, the symmetrical deposition of particles on the walls of the micropatterned holes seems not to be influenced by the horizontal gas-flow over the substrate due to a formation of stagnation boundary layer.…”

Section: Analyses Of the Cma-fsp Particle Deposition Processsupporting

confidence: 92%

“…As shown in Figure 5D, lifting off the ceramic mask after the deposition process may rupture the continuous layer and leave a pyramid behind with a cut-off tip, as depicted in Figure 5F. Our experimental observations are consistent with those found in a pressure-drop-driven particle-filtration/deposition model reported by Elmøe et al [29] However, in our work, the particle deposition is driven mainly by the high temperature-gradient between the gas flow and the water-cooled substrate, while in the model by Elmøe et al, no temperature-gradient was applied. [28] For masks with features of low aspect ratios ( 2) as shown in Figure 3G and H, a ruptured deposit structure will not be formed.…”

Section: Analyses Of the Cma-fsp Particle Deposition Processsupporting

confidence: 91%

See 1 more Smart Citation

Ceramic Mask‐Assisted Flame Spray Pyrolysis for Direct and Accurate Patterning of Metal Oxide Nanoparticles

et al. 2013

View full text Add to dashboard Cite

show abstract

Section: Analyses Of the Cma-fsp Particle Deposition Processsupporting

confidence: 92%

Section: Analyses Of the Cma-fsp Particle Deposition Processsupporting

confidence: 91%

Ceramic Mask‐Assisted Flame Spray Pyrolysis for Direct and Accurate Patterning of Metal Oxide Nanoparticles

et al. 2013

View full text Add to dashboard Cite

show abstract

“…Note that the mass of EC cannot be transformed into moles as EC is not a well-defined molecule characterized by its own molecular weight. Results highlighted a high level of correlation (R 2 > 0.9); despite this, for a prognostic model, the amount of water molecules [18] and the cake structure [89][90][91] should be quantitatively accounted for in future works.…”

Section: Generated Aerosols Conductance Measurementsmentioning

confidence: 94%

“…SMPS data were collected at the inlet of the PTFE filter holder to be representative of the real size distribution deposited onto the PTFE filters (average residence time of particles into the chambers: 6.7 min). Finally, the cake deposits were characterized as reported in literature [89][90][91] from SMPS data determining first the a-dimensionless Peclet number (Pe) and the following cake porosity (ε) as detailed in Thomas et al [91]:…”

Section: Laboratory Generated Ec and Saline Aerosolsmentioning

confidence: 99%

On the Synergy between Elemental Carbon and Inorganic Ions in the Determination of the Electrical Conductance Properties of Deposited Aerosols: Implications for Energy Applications

et al. 2020

View full text Add to dashboard Cite

The role of the elemental carbon (EC), in synergy with hygroscopic ionic species, was investigated to study the formation of electrical bridging phenomena once the aerosol deliquescence is achieved. Ambient aerosol samples were collected on hydrophobic surfaces in urban and rural sites in Northern Italy; their conductance was measured in an Aerosol Exposure Chamber (AEC) while varying the relative humidity. An electric signal was detected on 64% of the collected samples with conductance values (11.20 ± 7.43 μS) above the failure threshold (1 μS) of printed circuit boards. The ionic content was higher for non-electrically conductive samples (43.7 ± 5.6%) than for electrically conductive ones (37.1 ± 5.6%). Conversely, EC was two times higher for electrically conductive samples (26.4 ± 4.1 μg cm−2; 8.4 ± 1.7%) than for non-electrical ones (12.0 ± 4.1 μg cm−2; 5.2 ± 1.9%) suggesting that the synergy between the ionic and carbonaceous fractions is necessary to promote a bridging phenomenon. Synthetic aerosols (EC only, saline only, mixed saline and EC) were generated in laboratory and their conductance was measured in the AEC to verify the ambient results. Only in case of a contemporary presence of both EC and ionic components the bridging phenomenon occurred in keeping with the theoretical deliquescence values of each salt (R2 = 0.996).

show abstract

“…). This approach was previously validated ,, and has shown that this leads to particle deposition and film growth in the diffusion and ballistic regimes. This simulates and maps the vertical growth of a nanoparticle-agglomerate film from the substrate, up to at least 3.6 μm.…”

Section: Methodsmentioning

confidence: 99%

Omnidirectional Self-Assembly of Transparent Superoleophobic Nanotextures

et al. 2017

Self Cite

View full text Add to dashboard Cite

Engineering surface textures that are highly transparent and repel water, oil, and other low surface energy fluids can transform our interaction with wet environments. Despite extensive progress, current top-down methods are based on directional line-of-sight fabrication mechanisms that are limited by scale and cannot be applied to highly uneven, curved, and enclosed surfaces, while bottom-up techniques often suffer from poor optical transparency. Here, we present an approach that enables the rapid, omnidirectional synthesis of flexible and up to 99.97% transparent superhydrophobic and -oleophobic textures on many variable surface types. These features are obtained by the spontaneous formation of a multi re-entrant morphology during the controlled self-assembly of nanoparticle aerosols. We also develop a mathematical model to explain and control the self-assembly dynamics, providing important insights for the rational engineering of functional materials. We envision that our findings represent a significant advance in imparting superoleophobicity and superamphiphobicity to a so-far inapplicable family of materials and geometries for multifunctional applications.

show abstract

Characterization of highly porous nanoparticle deposits by permeance measurements

Cited by 13 publications

References 45 publications

Ceramic Mask‐Assisted Flame Spray Pyrolysis for Direct and Accurate Patterning of Metal Oxide Nanoparticles

Ceramic Mask‐Assisted Flame Spray Pyrolysis for Direct and Accurate Patterning of Metal Oxide Nanoparticles

On the Synergy between Elemental Carbon and Inorganic Ions in the Determination of the Electrical Conductance Properties of Deposited Aerosols: Implications for Energy Applications

Omnidirectional Self-Assembly of Transparent Superoleophobic Nanotextures

Contact Info

Product

Resources

About