Study of the texture of monodisperse silica sphere samples in the nanometer size range

Lecloux, A. J.; Bronckart, Joseph; Noville, Francis; Dodet, Claude; Marchot, Pierre; Pirard, Jean‐Paul

doi:10.1016/0166-6622(86)80345-6

Cited by 46 publications

(14 citation statements)

References 9 publications

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“…For all particles synthesized, the values range from 1.71 to 2.02 g/mL and are consistent with those determined by others (Auzerais, 1988;Bogush et al, 1988;Davis, 1989). Since amorphous silica has a density of 2.2 g/mL, the particles must be porous, as noticed by others (Lecloux et al, 1986).…”

Section: Model Colloidal Systemmentioning

confidence: 80%

Colloidal gel filtration: Experiment and theory

Shen¹,

Russel²,

Auzerais³

1994

AIChE Journal

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The filtration of colloidal gels, consisting of octadecyl-coated silica spheres in hexadecane, is examined experimentally using CA T scanning. A number of interparticle strengths are explored, with significant differences in qualitative behavior relative to the filtration of stable dispersions. For stiff gels, the transmission of stresses from the cell wall to the dispersion results in a fracturing phenomenon during consolidation on a length scale substantially larger than the particle size. For more pliant gels, the radial propagation of stress is more local to the wall region and gravitational effects play a prominent role. The existing theory of network consolidation is compared against our experimental results for pliant gels, independent of the form of the constitutive functions for the sedimentation velocity and yield stress. Though our measurements seem consistent with the theory at early times, deviations at later moments question whether a compressive yield stress is actually present.

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Section: Model Colloidal Systemmentioning

confidence: 80%

Colloidal gel filtration: Experiment and theory

Shen¹,

Russel²,

Auzerais³

1994

AIChE Journal

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“…Additionally, it has been demonstrated that amorphous silica coating over AgNPs presents porosity, allowing the diffusion of ions that can oxidize the silver core (Mulvaney et al, 1997). The porosity of the amorphous silica has already been proved in studies by different groups (Lecloux et al, 1986; van Blaaderen and Vrij, 1993). Nevertheless, unfortunately, according to the best of our knowledge, the antibacterial properties of AgNTs subjected to alkanethiol or silica coating have not yet been explored.…”

Section: Introductionmentioning

confidence: 81%

Exploring the Control in Antibacterial Activity of Silver Triangular Nanoplates by Surface Coating Modulation

Djafari

Fernández-Lodeiro

et al. 2019

Front. Chem.

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In the present work, the synthesis and characterization of silver triangular nanoplates (AgNTs) and their silica coating composites are reported. Engineering control on the surface coating has demonstrated the possibility to modulate the antibacterial effect. Several AgNT-coated nanomaterials, such as PVP (Polyvinylpyrrolidone) and MHA (16-mercaptohexadecanoic acid) as a stable organic coating system as well as uniform silica coating (≈5 nm) of AgNTs, have been prepared and fully characterized. The antibacterial properties of the systems reported, organic (MHA) and inorganic (amine and carboxylic terminated SiO2) coating nanocomposites, have been tested on Gram-positive and Gram-negative bacteria strains. We observed that the AgNTs' organic coating improved antimicrobial properties when compared to other spherical silver colloids found in the literature. We have also found that thick inorganic silica coating decreases the antimicrobial effect, but does not cancel it. In addition, the effect of surface charge in AgNTs@Si seems to play a crucial role toward S. aureus ATCC 25923 bacteria, obtaining MIC/MBC values compared to the AgNTs with an organic coating.

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“…Thus, as the diameter of the dendrimer increases, there is a concomitant increase in the surface area and pore volume of the corresponding gel. This phenomenon is surprising in view of what is known about the condensation of silica paricles in the sol−gel process, for which surface areas generally decrease as the condensing silica spheres increase in size . A likely explanation for this apparent anomaly is that the gel precursors G2‘-(OEt) 36 and G3‘-(OEt) 108 exhibit some degree of compressibility.…”

mentioning

confidence: 96%

“…Consistent with this, significant portions of the open volume in the xerogels arise from micropores (pore diameters < 20 Å; see Table ). Based on a BJH analysis of the porosimetry data, the measured pore size distribution is limited to radii = 10 Å. As can be seen from the plot of Figure , many of the pores in X-G3‘ undoubtedly have radii below this value, as the distribution tails rapidly from an apparent maximum of ca.…”

mentioning

confidence: 99%

Dendrimers as Building Blocks for Nanostructured Materials: Micro- and Mesoporosity in Dendrimer-Based Xerogels

Kriesel

Tilley

1999

Chem. Mater.

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Second and third generation silylalkoxy-terminated carbosilane dendrimers have been used to make high surface area xerogels via an acid-catalyzed sol-gel protocol. These xerogels are micro- and mesoporous and contain a high degree of −OH functionality. An unexpected trend with respect to dendrimer generation and xerogel surface area is described. These xerogels may have applications as (for example) catalyst supports and porous membranes.

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Study of the texture of monodisperse silica sphere samples in the nanometer size range

Cited by 46 publications

References 9 publications

Colloidal gel filtration: Experiment and theory

Colloidal gel filtration: Experiment and theory

Exploring the Control in Antibacterial Activity of Silver Triangular Nanoplates by Surface Coating Modulation

Dendrimers as Building Blocks for Nanostructured Materials: Micro- and Mesoporosity in Dendrimer-Based Xerogels

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