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Physical Review B
Volumn 37, Issue 3, 1988, Pages 1368-1375
Ordered structure in colloidal silica particle suspensions as studied by small-angle x-ray scattering
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EID: 0001441193     PISSN: 01631829     EISSN: None     Source Type: Journal    
DOI: 10.1103/PhysRevB.37.1368     Document Type: Article
Times cited : (30)
References (35)
  • 2
  • 25
    • 84926852592 scopus 로고    scopus 로고
    • A Guinier and G. Fournet, Small angle scattering of X-rays (Wiley, New York, 1955).
  • 26
    • 84926809001 scopus 로고    scopus 로고
    • According to Guinier and Fournet (Ref. 24) it is not strictly correct that the Guinier plot of the scattering intensity for a perfectly spherical particle shows a perfect linearity in a fairly wide angle range of a small-angle (Guinier) region. The plot must slip down at a higher angle region. The particles which show an excellent linearity are a prolate and an oblate ellipsoid of revolution with an axial ratio of 1.88 and 0.24, respectively. The excellent linearity in our case may indicate that the particles are not a ``perfect'' sphere and/or not monodisperse. The argument mentioned above does not prevent the exact estimation of the interparticle distance using the peak in the S(q) function, because the angles where the peak appears are smaller than the angles where the Guinier plot starts to show a deviation from linearity.
  • 27
    • 84926874314 scopus 로고    scopus 로고
    • It is well known that colloidal silica suspensions show a gel formation when a suitable amount of salt is added. However, the time scale of the phenomenon is a few weeks or a few months.
  • 31
    • 84926852591 scopus 로고    scopus 로고
    • The distance which can be calculated by Bragg's equation from the peak position in S(q) is not the nearest-neighbor interparticle distance (2Dexpt ) but the spacing of the plane. The first peak corresponds to the spacing of the (100) plane for sc, (111) for fcc, and (110) for bcc. Thus we can calculate 2Dexpt values using the following equations and the q value at the peak position (qm ) for each lattice system: 2Dexpt = (2 π )/qm for sc and 2Dexpt = (2 π /qm ) ( case 3 over 2 )1/2 for fcc and bcc. It was often claimed that the broad peak could not be attributed to the Bragg diffraction, and it did not correspond to the plane spacing. However, as will be shown in Sec. IV^F and was fully discussed in a separate article. (Ref. 7), the whole profile of S(q) can be well reproduced by the diffraction pattern from a distorted crystal.

* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.