From Polymeric to Particulate Inorganic Macrocellular Foams: Some Integrative Chemistry Synthetic Pathways

2007 ◽  
Vol 1007 ◽  
Author(s):  
Florent Carn ◽  
Rénal Backov
Keyword(s):  
Soft Matter ◽  
Volume Fraction ◽  
Liquid Fraction ◽  
Porous Silica ◽  
Good Control ◽  
Water Volume ◽  
Porous Scaffolds ◽  
Void Space ◽  
Porous Texture ◽  
Interdisciplinary Field

ABSTRACTHierarchically organized matter appears today a strong and highly competitive field of research mainly induced by the wide scope of applications expected. In this context, chemistry of shapes appears as a strong interdisciplinary field of research combining soft chemistry and soft matter. Hierarchical inorganic porous silica monoliths can be obtained combining air-liquid foams either with molecular precursors promoting condensation within the foam's Plateau borders confined geometry or with pre-synthesized nanobuilding blocks that will be organized within the foam's Plateau border and films. By controlling the air-liquid foam's water liquid fraction we can design the inorganic porous texture at the macroscale (i.e. cell sizes and shapes as well as the Plateau borders thickness). Considering the nanobuilding block approach, final scaffolds are a very close transcription of the tailored periodic air-liquid foam template, while highly ordered close-packed silica colloids are texturing the as-synthesized foam walls. The interconnected nanoparticles and associated void space between adjacent particles allow generating intrinsic mesopores, thereby defining hierarchically organized porous scaffolds. The good control over both the air-liquid foam's water volume fraction and the bubble size allow a rational tuning of the macropore shapes (diameter, Plateau border's width). In contrast with previous studies, closed-cell structures can be reached, while the opal like scaffold structure is maintained with thermal treatment, avoiding thus strong shrinkage associated to the sintering effect.

Silica Nanoparticles Three Dimensional Assembly: An Integrative Chemistry Approach Toward Designing Opal-Like Silica Foams

2007 ◽  
Vol 1017 ◽  
Author(s):  
Florent CARN ◽  
Renal BACKOV
Keyword(s):  
Liquid Flow ◽  
Volume Fraction ◽  
Three Dimensional ◽  
Film Surface ◽  
Good Control ◽  
Water Volume ◽  
Porous Scaffolds ◽  
Void Space ◽  
Water Volume Fraction ◽  
Liquid Foam

AbstractNovel meso-/macroporous SiO2 monoliths have been reached by applying a nanotectonic pathway within a confined geometry, i.e. a non-static air-liquid foam pattering process. Final scaffolds are a very close transcription of the tailored periodic air-liquid foam template while highly ordered close-packed silica colloids are texturing the as-synthesized foam walls. The interconnected nanoparticles and associated void space between adjacent particles allow generating intrinsic mesopores, thereby defining hierarchically organized porous scaffolds. The good control over both the air-liquid foam's water volume fraction and the bubble size allow a rational tuning of the macropore shape (diameter, Plateau border's width). At the nano-scale, heterogeneous textural character is associated with abrupt variation in the film's topology certainly governed by the complex liquid flow present within the foam film. This flow induces a surfactant concentration gradient that causes a sort of marginal regeneration on the side of the film. According to these observations, the heterogeneous character of the film surface revealed by AFM can be interpreted like a direct expression of the liquid flow within the air-liquid foam's film.

Engineering Three Dimensional Nanotextured Opal-Like Silica Foams

2005 ◽  
Vol 901 ◽  
Author(s):  
Florent Carn ◽  
Pascal Massé ◽  
Serge Ravaine ◽  
Rénal Backov
Keyword(s):  
Volume Fraction ◽  
Three Dimensional ◽  
Good Control ◽  
Water Volume ◽  
Porous Scaffolds ◽  
Void Space ◽  
Cell Structures ◽  
Closed Cell ◽  
Water Volume Fraction ◽  
Liquid Foam

AbstractNovel meso-/macroporous SiO2 monoliths have been reached by applying a nanotectonic pathway within a confined geometry, i.e. a non-static air-liquid foam patterning process. Final scaffolds are a very close transcription of the tailored periodic air-liquid foam template while coalesced silica particles are texturing the as-synthesized foam walls. The interconnected nanoparticles and associated void space between adjacent particles allow generating intrinsic mesopores, thereby defining hierarchically organized porous scaffolds. The good control over both the air-liquid foam’s water volume fraction and the bubble size allow a rational tuning of the macropore shape (diameter, Plateau border’s width). In contrast with previous study, closed-cell structures can be reached, while the opal like scaffold structure is maintained with thermal treatment, avoiding thus strong shrinkage associated to the sintering effect.

Air-Liquid Foams, Concentrated Direct Emulsion and Soft Chemistry Toward Hierarchically Organized Porous Silica Monoliths

2004 ◽  
Vol 847 ◽  
Author(s):  
F. Carn ◽  
A. Colin ◽  
M.-F. Achard ◽  
R. Backov
Keyword(s):  
Soft Matter ◽  
Liquid Fraction ◽  
Porous Silica ◽  
Soft Chemistry ◽  
Porous Texture ◽  
Silica Monoliths ◽  
Interdisciplinary Field ◽  
Liquid Foams ◽  
Oil Fraction ◽  
Lyotropic Mesophases

ABSTRACTHierarchically organized matter appears today a strong and highly competitive field of research mainly induced by the wide scope of applications expected. In this context, chemistry of shapes appears as a strong interdisciplinary field of research combining soft chemistry and soft matter. Hierarchical inorganic porous monoliths can be obtained using either air-liquid foams or biliquid foams as macroscopic patterns while lyotropic mesophases are employed to promote porosity at the mesoscale. By controlling the air-liquid foam's water liquid fraction or the emulsions oil fraction we can design the inorganic porous texture at the macroscale (i.e. cell sizes and shapes as well as the Plateau borders thickness). Those stategies lead to the formation of materials with characteristics that resemble aerogels.

Macroscopical monolayer films of ordered arrays of gold nanoparticles as SERS substrates for in-situ quantitative detection in aqueous solutions

Nanoscale ◽  
2021 ◽  
Author(s):  
Lixiang Xing ◽  
Cui Wang ◽  
Yi Cao ◽  
Jihui Zhang ◽  
Haibing Xia
Keyword(s):  
Gold Nanoparticles ◽  
Volume Fraction ◽  
Water Volume ◽  
Quantitative Detection ◽  
Monolayer Films ◽  
Au Nps ◽  
Sers Substrates ◽  
Ordered Arrays ◽  
Water Volume Fraction

In this work, macroscopical monolayer films of ordered arrays of gold nanoparticles (MMF-OA-Au NPs) are successfully prepared at the interfaces of toluene-diethylene glycol (DEG) with a water volume fraction of...

Transport properties of concrete-like granular materials interacted by their microstructures and particle components

2018 ◽  
Vol 32 (18) ◽  
pp. 1840011 ◽  
Author(s):  
Wenxiang Xu ◽  
Hongguang Sun ◽  
Wen Chen ◽  
Huisu Chen
Keyword(s):  
Transport Properties ◽  
Granular Materials ◽  
Soft Matter ◽  
Volume Fraction ◽  
Structural Characteristics ◽  
Effective Diffusion ◽  
Nonspherical Particles ◽  
Structure Property ◽  
Engineering Structures ◽  
Component Structure

Granular materials as typical soft matter, their transport properties play significant roles in durability and service life in relevant practical engineering structures. Physico-mechanical properties of materials are generally dependent of their microstructures including interfacial and porous characteristics. The formation of such microstructures is directly related to particle components in granular materials. Understanding the interactive mechanism of particle components, microstructures, and transport properties is a problem of great interest in materials research community. The resulting rigorous component-structure-property relations are also valuable for material design and microstructure optimization. This review article describes state-of-the-art progresses on modeling particle components, interfacial and porous configurations and incorporating these internal structural characteristics into modeling transport properties of granular materials. We mainly focus on three issues involving the simulation for geometrical components, the quantitative characterization for interfacial and porous microstructures, and the modeling strategies for diffusive behaviors of granular materials. In the first aspect, in-depth reviews are presented to realize complex morphologies of geometrical particles, to detect the overlap between adjacent nonspherical particles, and to simulate the random packings of nonspherical particles. In the second aspect, we emphasize the development progresses on the interfacial thickness and porosity distribution, the interfacial volume fraction, and the continuum percolation of soft particles representing compliant interfaces and discrete pores. In the final aspect, a literature review is also provided on modeling of transport properties on the forefront of the effective diffusion and anomalous diffusion in multiphase granular materials. Finally, some conclusions and perspectives for future studies are provided.

Changes in Cortical Myelination and Water Volume Fraction With Illness Duration in Schizophrenia

2020 ◽  
Vol 87 (9) ◽  
pp. S149-S150
Author(s):  
Yu Sui ◽  
Hilary Bertisch ◽  
Donald Goff ◽  
Alexey Samsonov ◽  
Mariana Lazar
Keyword(s):  
Volume Fraction ◽  
Water Volume ◽  
Illness Duration ◽  
Water Volume Fraction

scholarly journals COMPARATIVE ANALYSIS OF THREE-DIMENSIONAL NANOSTRUCTURE OF POROUS BIOCOMPATIBLE SCAFFOLDS MADE OF RECOMBINANT SPIDROIN AND SILK FIBROIN FOR REGENERATIVE MEDICINE

2015 ◽  
Vol 17 (2) ◽  
pp. 37-44 ◽  
Author(s):  
O. I. Agapova ◽  
A. E. Efimov ◽  
M. M. Moisenovich ◽  
V. G. Bogush ◽  
I. I. Agapov
Keyword(s):  
Volume Fraction ◽  
Three Dimensional ◽  
Scanning Probe ◽  
Porous Scaffolds ◽  
Volume Porosity ◽  
Integral Density ◽  
Regenerative Activity ◽  
Calculated Volume ◽  
Recombinant Spidroin

Aim.To perform a comparison of three-dimensional nanostructure of porous biocompatible scaffolds made of fibroinBombix moriand recombinant spidroin rS1/9.Materials and methods.Three-dimensional porous scaffolds were produced by salt leaching technique. The comparison of biological characteristics of the scaffolds shows that adhesion and proliferation of mouse fibroblastsin vitroon these two types of scaffolds do not differ significantly. Comparative experimentsin vivoshow that regeneration of bone tissue of rats is faster with implantation of recombinant spidroin scaffolds. Three-dimensional nanostructure of scaffolds and interconnectivity of nanopores were studied with scanning probe nanotomography (SPNT) to explain higher regenerative activity of spidroin-based scaffolds.Results.Significant differences were detected in the integral density and volume of pores: the integral density of nanopores detected on 2D AFM images is 46 μm–2    and calculated volume porosity is 24% in rS1/9-based scaffolds; in fibroin-based three-dimensional structures density of nanopores and calculated volume porosity were 2.4 μm–2  and 0.5%, respectively. Three-dimensional reconstruction system of nanopores and clusters of interconnected nanopores in rS1/9-based scaffolds showed that volume fraction of pores interconnected in percolation clusters is 35.3% of the total pore volume or 8.4% of the total scaffold volume.Conclusion.Scanning probe nanotomography method allows obtaining unique information about topology of micro – and nanopore systems of artificial biostructures. High regenerative activity of rS1/9-based scaffolds can be explained by higher nanoporosity of the scaffolds.

scholarly journals Modeling of Two-Phase Flow in Rough-Walled Fracture Using Level Set Method

Geofluids ◽  
2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Yunfeng Dai ◽  
Zhifang Zhou ◽  
Jin Lin ◽  
Jiangbo Han
Keyword(s):  
Crude Oil ◽  
Level Set Method ◽  
Level Set ◽  
Two Phase Flow ◽  
Volume Fraction ◽  
Contact Angles ◽  
Immiscible Fluids ◽  
Water Volume ◽  
Phase Flow ◽  
Two Phase

To describe accurately the flow characteristic of fracture scale displacements of immiscible fluids, an incompressible two-phase (crude oil and water) flow model incorporating interfacial forces and nonzero contact angles is developed. The roughness of the two-dimensional synthetic rough-walled fractures is controlled with different fractal dimension parameters. Described by the Navier–Stokes equations, the moving interface between crude oil and water is tracked using level set method. The method accounts for differences in densities and viscosities of crude oil and water and includes the effect of interfacial force. The wettability of the rough fracture wall is taken into account by defining the contact angle and slip length. The curve of the invasion pressure-water volume fraction is generated by modeling two-phase flow during a sudden drainage. The volume fraction of water restricted in the rough-walled fracture is calculated by integrating the water volume and dividing by the total cavity volume of the fracture while the two-phase flow is quasistatic. The effect of invasion pressure of crude oil, roughness of fracture wall, and wettability of the wall on two-phase flow in rough-walled fracture is evaluated.

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