Development of a technique to prepare porous materials from glasses

Yanagisawa, Kazumichi; Bao, Ningzhong; Shen, Liming; Onda, Ayumu; Kajiyoshi, Koji; Matamoras-Veloza, Zully; Rendón-Ángeles, J.C.

doi:10.1016/j.jeurceramsoc.2005.07.041

Cited by 14 publications

(11 citation statements)

References 19 publications

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“…As mentioned earlier, the expansion behavior during calcination was reported recently in glasses 33 . It was concluded that water incorporated into the glass structure by the hydrothermal reaction acted as a vesicant in the subsequent calcination at 750°C, resulting in the formation of macropores.…”

Section: Discussionsupporting

confidence: 54%

“…In this paper, a gehlenite (C 2 AS) porous ceramic with very good macro‐/mesopore self‐forming ability and an extraordinarily large volume expansion characteristic of the sintering stage, as well as its fabrication technique, are reported. It should be noted that just when we were surprised at finding this interesting ceramic accompanied by an extraordinarily large expansion behavior during the sintering process, an article on porous glasses appeared in the literature, in which the expansion of glass powder also took place during calcination at a high temperature 33 . However, it also required a hydrothermal pre‐treatment at 200°C for 6 h. Another paper on a new family of porous ceramics processed via pyrolytic reactive sintering was also found, 34 but it concerned the CaZrO 3 /MgO and Al 2 O 3 /LaPO 4 systems, where the porosity could only be controlled between ∼30% and 60%, which was a much narrower range compared with our results.…”

Section: Introductionmentioning

confidence: 99%

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Sintering Behavior of Gehlenite. Part I: Self‐Forming, Macro‐/Mesoporous Gehlenite—Pore‐Forming Mechanism, Microstructure, Mechanical, and Physical Properties

Jia

Kim

Kriven

2007

Journal of the American Ceramic Society

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A novel kind of pore self-forming macro-/mesoporous gehlenite (2CaO . Al 2 O 3 . SiO 2 ) ceramic (abbreviated C 2 AS) having a highest porosity of 80% corresponding to a volume expansion of 134% during sintering has been developed. The pore selfforming ability, microstructure, mechanical, and thermal physical properties of the porous ceramic are related to the sintering temperature. The gehlenite ceramic shows a very good pore selfforming ability over a very wide range of temperature from 9001 to 14501C. No vesicant is required and no hydrothermal treatment is needed, as is generally the case for other kinds of porous ceramics or glasses. The pore self-forming ability of the C 2 AS porous ceramic can be attributed to the escape of the adsorbed water vapor during the sintering process, due to automatic hydration of the fine, amorphous, flakey-shaped starting C 2 AS powder particles synthesized by the organic steric entrapment (PVA) method, as well as to their fine, porous microstructure. The pores of the ceramics can be either open or closed, and the average pore size ranges from 0.6 to 1.1 lm, corresponding to a porosity of 75%-80%, respectively. The porous ceramic can preserve nanometer-sized (26-50 nm) crystallites up to 10001C. Sintered or thermally treated under different conditions, the porous ceramics exhibit relatively high flexural strengths ranging from 9.1 to 15.4 MPa, with a standard deviation of 0.3 and 4.2 MPa, respectively. Thermal properties of the porous ceramic up to 10001C, including thermal expansion coefficient, thermal diffusivity, specific heat, and thermal conductivity, were investigated, and the stability of the porous ceramic in boiling water was also studied.

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Section: Discussionsupporting

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Sintering Behavior of Gehlenite. Part I: Self‐Forming, Macro‐/Mesoporous Gehlenite—Pore‐Forming Mechanism, Microstructure, Mechanical, and Physical Properties

Jia

Kim

Kriven

2007

Journal of the American Ceramic Society

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“…In general, it is well known that the chemical reactivity between glass and water under hydrothermal and supercritical conditions is further accelerated by the high mobility of ionic species and molecules which promote a high rate of ion exchange (M n+ /H 3 O + ) in the glass phase. 11 Hence, based on these results, we suggest that the solidification of the CRT glass particles might proceed even with the addition of a small amount of water, above 5 wt%. This water content reacts completely with the small glass particles.…”

Section: Densification and Microstructural Evaluation Of Hydrothermalmentioning

confidence: 63%

Preparation of foamed glasses from CRT TV glass by means of hydrothermal hot-pressing technique

Matamoros-Veloza

Rendón-Ángeles²,

Yanagisawa

et al. 2008

Journal of the European Ceramic Society

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“…[1][2][3][4][5][6][7][8][9][10][16][17] Macroscale morphology and pore structure control of inorganic porous materials are two of the main interests. Methods have been developed to prepare porous glass beads from soda-lime glass or Pyrex glass using a hydrothermal hot pressing process [18][19] or supercritical water. [20][21] In our former work, we developed a one-step subcritical water treatment method to prepare porous glass beads with a core-shell structure [22] .…”

Section: Introductionmentioning

confidence: 99%

Heavy Metal Ion Sorption Properties of Porous Glass Beads with a Core‐Shell Structure

Sun

Wang

Yang

et al. 2008

Solvent Extraction and Ion Exchange

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Porous glass beads with a core-shell structure have been successfully prepared through subcritical water treatment. The product has high capacity and fast mass transfer property due to its structure, and may serve as an inorganic adsorbent. Accordingly, the kinetics, the equilibrium isotherm, and the column breakthrough curve of this material were measured using Cu(II) as a model target ion. The results indicate that the material has an advantage over some other adsorbents, such as kaolinite and clinoptilolite, in both adsorption capacity and kinetics. The adsorption capacity for Cu(II) is almost twice as much as that of the Na-mordenite. The pseudo-second order kinetic and the Langmuir isotherm fit the experimental data. An adsorption mechanism was hypothesized in which the non-bridging oxygen ions in the glass network were hypothesized to be the functional site.

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Development of a technique to prepare porous materials from glasses

Cited by 14 publications

References 19 publications

Sintering Behavior of Gehlenite. Part I: Self‐Forming, Macro‐/Mesoporous Gehlenite—Pore‐Forming Mechanism, Microstructure, Mechanical, and Physical Properties

Sintering Behavior of Gehlenite. Part I: Self‐Forming, Macro‐/Mesoporous Gehlenite—Pore‐Forming Mechanism, Microstructure, Mechanical, and Physical Properties

Preparation of foamed glasses from CRT TV glass by means of hydrothermal hot-pressing technique

Heavy Metal Ion Sorption Properties of Porous Glass Beads with a Core‐Shell Structure

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