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Volumn 21, Issue 19, 2005, Pages 8960-8971

Physical basis for the formation and stability of silica nanoparticles in basic solutions of monovalent cations

Author keywords

[No Author keywords available]

Indexed keywords

CHEMICAL EQUILIBRIA; ELECTROSTATIC MODELS; NANOPARTICLES;

EID: 25844483821     PISSN: 07437463     EISSN: None     Source Type: Journal    
DOI: 10.1021/la0511384     Document Type: Article
Times cited : (118)

References (56)
  • 16
    • 25844489656 scopus 로고    scopus 로고
    • note
    • The solutions in Figure 1 were prepared by mixing TPAOH (40% w/w, Alfa Aesar) with water, followed by the addition of TEOS (98%, Aldrich). The solutions were allowed to stir overnight prior to conductivity and pH measurements.
  • 18
    • 25844454183 scopus 로고    scopus 로고
    • note
    • The oblate ellipsoid shape agrees with the consensus in the literature that the nanoparticles have a nonspherical geometry: Watson et al., 1997 (cylinders) and Ravishankar et al., 1999 (slab).
  • 21
    • 25844476586 scopus 로고    scopus 로고
    • note
    • The SAXS intensities for Y = 40-60 are shown in Supporting Information (Section I). Pair-distance distribution functions (PDDFs) of the intensity patterns show that the nanoparticle size is approximately constant and that only the concentration of particles increases with silica concentration.
  • 28
    • 25844502137 scopus 로고    scopus 로고
    • note
    • We have omitted any nonidealities by making activity coefficients equal to one.
  • 29
    • 25844525034 scopus 로고    scopus 로고
    • note
    • 4.
  • 33
    • 25844521643 scopus 로고    scopus 로고
    • note
    • a, np, is negligible (see Supporting Information, Section III. D).
  • 34
    • 25844481745 scopus 로고    scopus 로고
    • note
    • 2O); however, these changes are insignificant and result in a small increase in the predicted pH. Details of these calculations are provided in Supporting Information (Section V).
  • 49
    • 25844519333 scopus 로고    scopus 로고
    • note
    • The complexation model was analyzed with varying δ (0.5-0.76) onthe basis of the potential range of nanoparticle densities (1.75-2.0 g/cm3), and it was shown that the surface potential can vary by ∼20 mV (see Supporting Information, Section III. D).
  • 50
    • 25844466170 scopus 로고    scopus 로고
    • note
    • np, N = 9.0 because this is the value reported by Sefcik and McCormick for the first dissociation constant of an oligomer.
  • 54
    • 0005709625 scopus 로고
    • Surface-chemistry and surface-energy of silicas
    • Bergna, H. E., Ed.; Advances in Chemistry Series; American Chemical Society: Washington, DC
    • Vidal, A. M.; Papirer, E. Surface-Chemistry and Surface-Energy of Silicas. In Colloid Chemistry of Silica; Bergna, H. E., Ed.; Advances in Chemistry Series; American Chemical Society: Washington, DC, 1994; p 245.
    • (1994) Colloid Chemistry of Silica , pp. 245
    • Vidal, A.M.1    Papirer, E.2


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.