Semi-fluorinated Surfactant Syntheses of Ordered Porous Materials with Tailorable Pore Sizes

2004 ◽  
Vol 16 (25) ◽  
pp. 5518-5526 ◽  
Author(s):  
Xiangju Meng ◽  
Yan Di ◽  
Lan Zhao ◽  
Dazhen Jiang ◽  
Shougui Li ◽  
...  
Keyword(s):  
Porous Materials ◽  
Fluorinated Surfactant ◽  
Pore Sizes ◽  
Ordered Porous

scholarly journals Atoms and the void: modular construction of ordered porous solids

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
James D. Wuest
Keyword(s):  
Porous Materials ◽  
Molecular Level ◽  
Porous Solids ◽  
Modular Construction ◽  
Molecular Components ◽  
New Generation ◽  
Ordered Porous

Abstract For millennia, humans have exploited the special properties of porous materials. Advances in recent years have yielded a new generation of finely structured porous materials that allow processes to be controlled at the molecular level. These materials are built by a strategy of modular construction, using molecular components designed to position their neighbors in ways that create predictable voids.

scholarly journals Composition Materials With Metal Matrix Condensed from the Vapor Phase

2021 ◽  
Vol 8 ◽  
pp. 24-29
Author(s):  
N.I. Grechanyuk ◽  
V.G. Grechanyuk ◽  
A.F. Manulyk
Keyword(s):  
Porous Materials ◽  
Vapor Phase ◽  
Metal Matrix ◽  
Open Porosity ◽  
Deposition Temperature ◽  
Second Phase ◽  
Pore Sizes ◽  
Phase Concentration ◽  
Composition Materials ◽  
Condensed Materials

In this article, the present-day problems of microporous condensed materials obtained from the vapor phase are discussed. The pore sizes are regulated by the amount of the second phase concentration and the deposition temperature. The oxides, fluorides, and sulfides can be used as the second phase and non-removable inclusions. The open porosity can be regulated from 0% to 50 %of the porosity and with average porose sizes of 0.1 to 8 µm. The condensed micro-porous materials can be deposited in coating form or the form of massive bulk sheet materials with a thickness of up to 6 mm and a diameter of 1m.

scholarly journals A 3D model to predict the influence of nanoscale pores or reduced gas pressures on the effective thermal conductivity of cellular porous building materials

2019 ◽  
Vol 43 (4) ◽  
pp. 277-300 ◽  
Author(s):  
Wouter Van De Walle ◽  
Hans Janssen
Keyword(s):  
Thermal Conductivity ◽  
Porous Materials ◽  
Effective Thermal Conductivity ◽  
Building Materials ◽  
Full Range ◽  
Advanced Materials ◽  
Future Application ◽  
High Porosity ◽  
Pore Sizes ◽  
Gas Pressures

Cellular porous materials are frequently applied in the construction industry, both for structural and insulation purposes. The progressively stringent energy regulations mandate the development of better performing insulation materials. Recently, novel porous materials with nanopores or reduced gas pressures have been shown to possess even lower thermal conductivities because of the Knudsen effect inside their pores. Further understanding of the relation between the pore structure and the effective thermal conductivity is needed to quantify the potential improvement and design new optimized materials. This article presents the extension of a 3D numerical framework simulating the heat transfer at the pore scale. A novel methodology to model the reduced gas-phase conductivity in nanopores or at low gas pressures is presented, accounting for the 3D pore geometry while remaining computationally efficient. Validation with experimental and numerical results from the literature indicates the accuracy of the methodology over the full range of pore sizes and gas pressures. Combined with an analytical model to account for thermal radiation, the framework is applied to predict the thermal conductivity of a nanocellular poly(methyl methacrylate) foam experimentally characterized in the literature. The simulation results show excellent agreement with less than 5% difference with the experimental results, validating the model’s performance. Furthermore, results also indicate the potential improvements when decreasing the pore size from the micrometre to the nanometre range, mounting up to 40% reduction for such high-porosity low-matrix-conductivity materials. Future application of the model could assist the design of advanced materials, properly accounting for the effect of reduced pore sizes and gas pressures.

scholarly journals Reminiscent capillarity in subnanopores

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Irena Deroche ◽  
T. Jean Daou ◽  
Cyril Picard ◽  
Benoit Coasne
Keyword(s):  
Surface Tension ◽  
Porous Materials ◽  
Adsorption Energy ◽  
Phenomenological Model ◽  
Chemical Potential ◽  
Nanoporous Materials ◽  
Simulation Data ◽  
Pore Sizes ◽  
Fluid Surface ◽  
Molecular Scale

Abstract Fluids in large and small pores display different behaviors with a crossover described through the concept of critical capillarity. Here we report experimental and simulation data for various siliceous zeolites and adsorbates that show unexpected reminiscent capillarity for such nanoporous materials. For pore sizes D exceeding the fluid molecule size, the filling pressures p are found to follow a generic behavior kBT ln p ∼ γ/ρD where γ and ρ are the fluid surface tension and density. This result is rationalized by showing that the filling chemical potential for such ultra-small pores is the sum of an adsorption energy and a capillary energy that remains meaningful even for severe confinements. A phenomenological model, based on Derjaguin’s formalism to bridge macroscopic and molecular theories for condensation in porous materials, is developed to account for the behavior of fluids confined down to the molecular scale from simple parameters.

Novel Macro and Meso Porous Materials Prepared from Miscible Polysulfone/Polyimide Blends

2002 ◽  
Vol 752 ◽  
Author(s):  
Yong Ding ◽  
Benjamin Bikson
Keyword(s):  
Bisphenol A ◽  
Porous Materials ◽  
The Other ◽  
Porous Membranes ◽  
Transparent Films ◽  
Pore Sizes ◽  
Other Hand ◽  
Polyether Sulfone ◽  
Miscible Blends ◽  
Hydrazine Solution

ABSTRACTNovel macro and meso porous polysulfone materials were prepared from miscible blends of polysulfones with a phenylindane containing polyimide by chemically decomposing the polyimide phase with a dilute hydrazine solution in methanol. The polyether sulfone meso porous membranes are transparent films, with uniform pore sizes in the range of 30 nm. On the other hand, bisphenol A polysulfone based porous materials are opaque with pore sizes in the range of 200 nm.

Strengthening of polymer ordered porous materials based on a layered nanocomposite internal structure

Nanoscale ◽  
2016 ◽  
Vol 8 (27) ◽  
pp. 13507-13512 ◽  
Author(s):  
Liping Heng ◽  
Xieyou Guo ◽  
Tianqi Guo ◽  
Bin Wang ◽  
Lei Jiang
Keyword(s):  
Porous Materials ◽  
Internal Structure ◽  
Ordered Porous

Introduction to the themed issue in honor of Dr François Fajula: “An exciting journey in the creative world of ordered porous materials and their applications”

2016 ◽  
Vol 40 (5) ◽  
pp. 3930-3932 ◽  
Author(s):  
Anne Galarneau ◽  
Irina I. Ivanova
Keyword(s):  
Porous Materials ◽  
Porous Solids ◽  
Ordered Porous

This themed issue, dedicated to François Fajula, includes the latest achievements in the field of ordered porous solids, which is among the most creative, fascinating and attractive fields of chemistry.

scholarly journals Nature of Capillary Condensation and Evaporation Processes in Ordered Porous Materials

Langmuir ◽  
2005 ◽  
Vol 21 (23) ◽  
pp. 10515-10521 ◽  
Author(s):  
Annie Grosman ◽  
Camille Ortega
Keyword(s):  
Porous Materials ◽  
Capillary Condensation ◽  
Ordered Porous
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