Changing the relation between micro- and mesoporosity in porous glasses: The effect of different factors

Крейсберг, В. А.; Антропова, Т. В.

doi:10.1016/j.micromeso.2014.02.002

Cited by 51 publications

(24 citation statements)

References 29 publications

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“…The glasses were also investigated using LN adsorption/desorption technique using a Brunauer-Emmett-Teller (BET) porosimetry method (heat desorption of nitrogen at 77 K [2]). After introduction of the Rot 305 into PG a pore volume is sharply decreased while specific surface area from BET remains in the initial level.…”

Section: Resultsmentioning

confidence: 99%

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Porous glasses as a host of luminescent materials, their applications and site selective determination

Reisfeld

Jasińska

Левченко

et al. 2016

Journal of Luminescence

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Section: Resultsmentioning

confidence: 99%

“…They are prepared by chemical etching of alkali borosilicate (ABS) glasses with a two-framework structure [2,3], and are a typical example of fractal structure of dimensions between 1 and 3 [3]. They have been a subject of numerous papers dealing with fractals.…”

Section: Introductionmentioning

confidence: 99%

Porous glasses as a host of luminescent materials, their applications and site selective determination

Reisfeld

Jasińska

Левченко

et al. 2016

Journal of Luminescence

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“…For studying the porous space parameters, the classical method of equilibrium adsorption and desorption isotherms of nitrogen at 77 K was used. The PG samples' porosity and average pore diameter were~0.5 (cm 3 /cm 3 ) and 25 nm respectively [43]. Figure 1a shows a typical scanning electron microscopic (SEM) image of a porous glass microstructure, which is a system of tortuosity channels, the material porosity in this case was 52-56%.…”

Section: Pg Materials Synthesismentioning

confidence: 96%

Glass/Au Composite Membranes with Gold Nanoparticles Synthesized inside Pores for Selective Ion Transport

Лебедев¹,

Novomlinsky²,

Kochemirovsky³

et al. 2020

Materials

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4Grebenshchikov Institute of Silicate Chemistry (ISCh) RAS, 2 Adm. Makarova emb., St Petersburg 199155, Russia; anfimova-i@mail.ru (I.A.); antr2@yandex.ru (T.A.) Abstract: Nanocomposite membranes have been actively developed in the last decade. The involvement of nanostructures can improve the permeability, selectivity, and anti-fouling properties of a membrane for improved filtration processes. In this work, we propose a novel type of ion-selective Glass/Au composite membrane based on porous glass (PG), which combines the advantages of porous media and promising selective properties. The latter are achieved by depositing gold nanoparticles into the membrane pores by the laser-induced liquid phase chemical deposition technique. Inside the pores, gold nanoparticles with an average diameter 25 nm were formed, which was confirmed by optical and microscopic studies. To study the transport and selective properties of the PG/Au composite membrane, the potentiometric method was applied. The uniform potential model was used to determine the surface charge from the experimental data. It was found that the formation of gold nanoparticles inside membrane pores leads to an increase in the surface charge from −2.75 mC/m 2 to −5.42 mC/m 2 . The methods proposed in this work allow the creation of a whole family of composite materials based on porous glasses. In this case, conceptually, the synthesis of these materials will differ only in the selection of initial precursors.Nanocomposite membranes have been actively developed in the last decade [17]. The involvement of nanostructures can improve the permeability, selectivity, and anti-fouling properties of a membrane for improved filtration processes. One of the most promising approaches to producing such composite materials is the formation of nanoparticles inside the porous structure of a membrane. As with nanotechnology in general [18], there are two main methods [17] for the formation of nanoparticles inside the membranous pores: "top down"-bulk modification through blending (called mixed-matrix membranes) and "bottom up"-surface modification. In the fabrication of bulk-modified nanocomposite membranes, the nanoparticles are dispersed in a homogeneous polymeric precursor solution before the final formation process [19]. However, this method is difficult to use, for example, in the synthesis of inorganic solid membranes. The surface modification technique is the most convenient method in this case [11]. The surface modification technique deals with deposition of nanoparticles onto a membrane.Silicate (high silica) porous glasses (PGs) are channel-type nanostructures [20] with thermal, chemical and microbiological stability, in combination with controlled surface structural characteristics [21][22][23]. Special attention is worth paying to the PG application for the separation of liquid mixtures by reverse osmosis. This method has found application in water desalination, sanitary household water cleaning, water regeneration from vital function products in space, radioactive ...

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“…Such experiments can be realized using porous glass (PG) membranes prepared by consequent acid and alkaline etching of liquated sodium borosilicate glass. [1][2][3] Special convenience of PG for the purpose of revealing dimensional features of the diffusion is that it is suited for the production in the form of thin plates/membranes with through channels of controlled radius, which may be varied over a wide range. [3,4] The quantitative dimensional peculiarities of aqueous salts solutions diffusion transport through the set of PG membranes with varied pore radius (r p ) have been studied only in our works.…”

Section: Introductionmentioning

confidence: 99%

Diffusion transport of Ca(NO3)2 aqueous solution in porous glass membranes

Pak

Gavronskaya

2019

Chem Rep

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Changing the relation between micro- and mesoporosity in porous glasses: The effect of different factors

Cited by 51 publications

References 29 publications

Porous glasses as a host of luminescent materials, their applications and site selective determination

Porous glasses as a host of luminescent materials, their applications and site selective determination

Glass/Au Composite Membranes with Gold Nanoparticles Synthesized inside Pores for Selective Ion Transport

Diffusion transport of Ca(NO3)2 aqueous solution in porous glass membranes

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