Critical effect of pore characteristics on capillary infiltration in mesoporous films

Ceratti, Davide Raffaele; Faustini, Marco; Sinturel, Christophe; Vayer, Marylène; Dahirel, Vincent; Jardat, Marie; Grosso, David

doi:10.1039/c4nr03021d

Cited by 71 publications

(73 citation statements)

References 37 publications

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“…Even if no arrests occur the advancement of the front will slow in a fashion similar to that predicted by Lucas‐Washburn equation. Front roughening, slowing, and arrest all enhance the impact of evaporation of the solvent within the pore structure . Evaporation in larger diameter pores and subsequent condensation at smaller pore intersections has been proposed as a mechanism that could trap air in pores, resulting in reduced imbibition, similar to dead ends in the pore network .…”

Section: Discussionmentioning

confidence: 99%

“…Front roughening, slowing, and arrest all enhance the impact of evaporation of the solvent within the pore structure . Evaporation in larger diameter pores and subsequent condensation at smaller pore intersections has been proposed as a mechanism that could trap air in pores, resulting in reduced imbibition, similar to dead ends in the pore network . The greater volatility of DCE may thus result in lower imbibition for DCE than for water.…”

Section: Discussionmentioning

confidence: 99%

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Fabrication and Characterization of Nanoporous Gold Electrodes for Sensor Applications

Francis

Knospe

2019

Adv Eng Mater

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Nanoporous gold electrodes are fabricated by etching white gold leaf in nitric acid. Samples of various thickness and alloy composition are used and etch time is varied. Electrode pore structure is characterized by scanning electron microscopy. Significant coarsening of ligament and pore structure is observed as etching time is varied from 5 to 90 min. Nanoporous gold electrode impedance is determined via electrochemical impedance spectroscopy. Test cells are constructed for this purpose consisting of two electrodes and an electrolyte. Both water and dichloroethane are examined as electrolyte solvents. A constant phase element with exponent greater than 0.9 is shown to provide an excellent description of interface impedance behavior for these test cells. Optimization is used to determine pseudo-capacitance and exponent in each case. A comparison of nanoporous gold electrode impedance to planar gold electrode impedance is made to derive the effective area of the nanoporous gold electrode. It is found in all cases that interfacial impedances are much lower (>40 Â) than those of conventional electrodes. Test results show that significant variations in effective area can occur depending on the electrolyte employed.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Fabrication and Characterization of Nanoporous Gold Electrodes for Sensor Applications

Francis

Knospe

2019

Adv Eng Mater

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“…Nowadays, nanofluidic channels are usually fabricated by cumbersome, expensive, and time‐consuming top‐down processes, limiting the full development of this emerging field . Briefly, PPNs are composed by ceramic nanopillars covered by a roof and are obtained by replication of nanoporous PS templates produced from PS‐ b ‐P2VP block copolymer self‐assembled layer . The detailed preparation protocol is reported in the Experimental Section.…”

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confidence: 99%

A New Dip Coating Method to Obtain Large‐Surface Coatings with a Minimum of Solution

et al. 2015

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“…These changes are measured by environmental ellipsometry on the flat titania film nearby the arrays. Adsorption and desorption of water within the pores follow a different kinetics, which is reflected in the typical hysteresis cycle in the measured refractive index on the 2D, flat titania layer nearby the arrays (Figure b) . The study of the hysteresis can lead to getting insights into the complex dynamics of water in the titania nanopores, which is largely outside the scope of this paper.…”

Section: Resultsmentioning

confidence: 99%

Multifunctional Metasurfaces Based on Direct Nanoimprint of Titania Sol–Gel Coatings

Checcucci

Bottein

Gurioli

et al. 2019

Advanced Optical Materials

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shaping, [12][13][14] sensing, [15,16] and nonlinear phenomena [17][18][19][20] are few examples demonstrating the strength of this approach for light management with sub-wavelength dielectric structures. However, with a few exceptions based on colloidal assembly, [21][22][23] hydrothermal growth, [20] solid state dewetting, [24][25][26][27][28][29][30] and aerosol spray, [31] most of these achievements were based on complex and expensive fabrication methods involving several steps (such as e-beam lithography and reactive ion etching). Top-down fabrication approaches limit the full exploitation of Mie resonators for unexpensive devices and broad areas production. In particular, given the rapidly rising interest in structural coloring and light filtering with dielectric metasurfaces [32][33][34][35][36][37][38][39][40][41] a versatile and scalable method is highly desirable to overcome the gap separating mere proof of principles and industrial applications. In this framework, a major step forward would be the development of fabrication techniques fully compatible with back-end processing of C-MOS circuitry (e.g., keeping the maximal processing temperature below ≈450 °C) or more generally, on electronic devices such as LEDs and photovoltaic panels.So far, most studies on Mie resonators are based on Si or Ge materials, due to both their very large index of refraction and the possibility to exploit the well-developed nanofabrication approaches of nanoelectronics and nanophotonics. Among other materials, TiO 2 (titania) is recently attracting growing interest [35,[42][43][44][45][46] for its transparency up to near-UV frequencies and its relatively high refractive index. Indeed, TiO 2 -based Mie resonators systems can potentially outperform conventional Si and Ge-based dielectric metasurfaces, which suffer from larger absorption at short wavelength [47,48] (e.g., at 450 nm: n TiO2 = 2.55, k TiO2 = 1.2 × 10 −5 ; n Si = 4.5; k Si = 0.13; n Ge = 4; and k Ge = 2.24). A quite unique peculiarity of titania is the tunable porosity (adjustable by modifying the sol-gel fabrication process) and therefore permeability to liquids and gas. In addition to this, titania is an abundant, cheap, nontoxic, photocatalytic, mechanically strong, and chemically stable material, featuring a relatively low mass density (≈3.8 g cm −3 in the anatase form against ≈5 g cm −3 for MoS 2 ). These features make titania an ideal metamaterial providing several functions (e.g., tunable structural color, sensing small changes in the environment), for a novel photonic platform in view of multifunctional devices. Dielectric Mie resonators are taking momentum in the last years thanks to their peculiar properties in light management at visible and near-infrared frequencies. However, their full exploitation demands for cheap materials and versatile fabrication methods, extendible over large surfaces and potentially C-MOS compatible. Here, a sol-gel deposition and nanoimprint lithography method is used to obtain titania-based Mie resonators over large areas (s...

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Critical effect of pore characteristics on capillary infiltration in mesoporous films

Cited by 71 publications

References 37 publications

Fabrication and Characterization of Nanoporous Gold Electrodes for Sensor Applications

Fabrication and Characterization of Nanoporous Gold Electrodes for Sensor Applications

A New Dip Coating Method to Obtain Large‐Surface Coatings with a Minimum of Solution

Multifunctional Metasurfaces Based on Direct Nanoimprint of Titania Sol–Gel Coatings

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