Specific surface area of stoeber silica determined by various experimental methods

M. Szekeres, József Tóth, I. Dékány

Research output: Contribution to journalArticle

52 Citations (Scopus)

Abstract

The specific surface area of amorphous Aerosil 200 and silica particles with 270 nm diameter prepared by the Stoeber method was investigated by a variety of experimental methods: nitrogen adsorption at 77 and 253 K; adsorption from ethanol/cyclohexane mixture; heats of wetting measurements; small-angle X-ray scattering (SAXS) experiments. The N2 adsorption isotherms at 77 K were analyzed using the BET equation, the modified BET equations of Tóth, and equations of the uniform interpretation method of Tóth. For Aerosil 200, the values of the specific surface varied slightly depending on the applied method. For Stoeber silica, the results from nitrogen adsorption at 77 K ranged between 18 and 24 m2/g; these values were 20-30 times smaller than those derived from N2 adsorption at 253 K, binary liquid mixture adsorption, and heats of wetting or SAXS experiments (439-670 m2/g). The specific surface area of Stoeber silica estimated from nitrogen adsorption measurement at 77 K could not be applied to adsorption data from liquid medium; the other methods, however, provided reliable surface area and charge density values. According to the pore size distribution curves from thermogravimetry, two mean pore diameter values are distinguished (2 and 16 nm), but larger pores also exist in the structure of the Stoeber silica particles. According to the SAXS results Stoeber silica has a mass fractal structure (Dm = 1.73) on the length scale of 5-25 nm.

Original languageEnglish
Pages (from-to)2678-2685
Number of pages8
JournalLangmuir
Volume18
Issue number7
DOIs
Publication statusPublished - Apr 2 2002

Fingerprint

Specific surface area
Silicon Dioxide
Silica
silicon dioxide
Adsorption
adsorption
X ray scattering
Nitrogen
Wetting
porosity
nitrogen
wetting
scattering
heat
Liquids
x rays
Cyclohexane
Charge density
Adsorption isotherms
Fractals

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

Specific surface area of stoeber silica determined by various experimental methods. / Szekeres, M.; Tóth, József; Dékány, I.

In: Langmuir, Vol. 18, No. 7, 02.04.2002, p. 2678-2685.

Research output: Contribution to journalArticle

@article{8922165db84446ad999eaff8e94d9660,
title = "Specific surface area of stoeber silica determined by various experimental methods",
abstract = "The specific surface area of amorphous Aerosil 200 and silica particles with 270 nm diameter prepared by the Stoeber method was investigated by a variety of experimental methods: nitrogen adsorption at 77 and 253 K; adsorption from ethanol/cyclohexane mixture; heats of wetting measurements; small-angle X-ray scattering (SAXS) experiments. The N2 adsorption isotherms at 77 K were analyzed using the BET equation, the modified BET equations of T{\'o}th, and equations of the uniform interpretation method of T{\'o}th. For Aerosil 200, the values of the specific surface varied slightly depending on the applied method. For Stoeber silica, the results from nitrogen adsorption at 77 K ranged between 18 and 24 m2/g; these values were 20-30 times smaller than those derived from N2 adsorption at 253 K, binary liquid mixture adsorption, and heats of wetting or SAXS experiments (439-670 m2/g). The specific surface area of Stoeber silica estimated from nitrogen adsorption measurement at 77 K could not be applied to adsorption data from liquid medium; the other methods, however, provided reliable surface area and charge density values. According to the pore size distribution curves from thermogravimetry, two mean pore diameter values are distinguished (2 and 16 nm), but larger pores also exist in the structure of the Stoeber silica particles. According to the SAXS results Stoeber silica has a mass fractal structure (Dm = 1.73) on the length scale of 5-25 nm.",
author = "M. Szekeres and J{\'o}zsef T{\'o}th and I. D{\'e}k{\'a}ny",
year = "2002",
month = "4",
day = "2",
doi = "10.1021/la011370j",
language = "English",
volume = "18",
pages = "2678--2685",
journal = "Langmuir",
issn = "0743-7463",
publisher = "American Chemical Society",
number = "7",

}

TY - JOUR

T1 - Specific surface area of stoeber silica determined by various experimental methods

AU - Szekeres, M.

AU - Tóth, József

AU - Dékány, I.

PY - 2002/4/2

Y1 - 2002/4/2

N2 - The specific surface area of amorphous Aerosil 200 and silica particles with 270 nm diameter prepared by the Stoeber method was investigated by a variety of experimental methods: nitrogen adsorption at 77 and 253 K; adsorption from ethanol/cyclohexane mixture; heats of wetting measurements; small-angle X-ray scattering (SAXS) experiments. The N2 adsorption isotherms at 77 K were analyzed using the BET equation, the modified BET equations of Tóth, and equations of the uniform interpretation method of Tóth. For Aerosil 200, the values of the specific surface varied slightly depending on the applied method. For Stoeber silica, the results from nitrogen adsorption at 77 K ranged between 18 and 24 m2/g; these values were 20-30 times smaller than those derived from N2 adsorption at 253 K, binary liquid mixture adsorption, and heats of wetting or SAXS experiments (439-670 m2/g). The specific surface area of Stoeber silica estimated from nitrogen adsorption measurement at 77 K could not be applied to adsorption data from liquid medium; the other methods, however, provided reliable surface area and charge density values. According to the pore size distribution curves from thermogravimetry, two mean pore diameter values are distinguished (2 and 16 nm), but larger pores also exist in the structure of the Stoeber silica particles. According to the SAXS results Stoeber silica has a mass fractal structure (Dm = 1.73) on the length scale of 5-25 nm.

AB - The specific surface area of amorphous Aerosil 200 and silica particles with 270 nm diameter prepared by the Stoeber method was investigated by a variety of experimental methods: nitrogen adsorption at 77 and 253 K; adsorption from ethanol/cyclohexane mixture; heats of wetting measurements; small-angle X-ray scattering (SAXS) experiments. The N2 adsorption isotherms at 77 K were analyzed using the BET equation, the modified BET equations of Tóth, and equations of the uniform interpretation method of Tóth. For Aerosil 200, the values of the specific surface varied slightly depending on the applied method. For Stoeber silica, the results from nitrogen adsorption at 77 K ranged between 18 and 24 m2/g; these values were 20-30 times smaller than those derived from N2 adsorption at 253 K, binary liquid mixture adsorption, and heats of wetting or SAXS experiments (439-670 m2/g). The specific surface area of Stoeber silica estimated from nitrogen adsorption measurement at 77 K could not be applied to adsorption data from liquid medium; the other methods, however, provided reliable surface area and charge density values. According to the pore size distribution curves from thermogravimetry, two mean pore diameter values are distinguished (2 and 16 nm), but larger pores also exist in the structure of the Stoeber silica particles. According to the SAXS results Stoeber silica has a mass fractal structure (Dm = 1.73) on the length scale of 5-25 nm.

UR - http://www.scopus.com/inward/record.url?scp=0037007332&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0037007332&partnerID=8YFLogxK

U2 - 10.1021/la011370j

DO - 10.1021/la011370j

M3 - Article

AN - SCOPUS:0037007332

VL - 18

SP - 2678

EP - 2685

JO - Langmuir

JF - Langmuir

SN - 0743-7463

IS - 7

ER -