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Volumn 61, Issue 6 B, 2000, Pages 6922-6933

Surprisingly short-ranged interactions in highly charged colloidal suspensions

Author keywords

[No Author keywords available]

Indexed keywords

ALGORITHMS; ANISOTROPY; COLLOIDS; IMAGE PROCESSING; ION EXCHANGE RESINS; MATHEMATICAL MODELS; MICROSCOPIC EXAMINATION; MIXTURES; POLYSTYRENES; STRUCTURE (COMPOSITION); SUSPENSIONS (FLUIDS); COMPUTER GRAPHICS; COMPUTERIZED TOMOGRAPHY; DENSITY FUNCTIONAL THEORY; DISTRIBUTION FUNCTIONS; ION EXCHANGE; MULTIMEDIA SYSTEMS;

EID: 0034205519     PISSN: 1063651X     EISSN: None     Source Type: Journal    
DOI: 10.1103/PhysRevE.61.6922     Document Type: Article
Times cited : (14)

References (44)
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    • The glass parts used in constructing the sample cell were cleaned by sonication at 50-60°C for 15-30 min in a solution of Pex (Peck's Products Co.) and distilled water (three times in fresh solutions), followed by distilled water (three times), acetone (one time), methanol (three times), distilled water (three times), and finally deionized water (two times).
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    • note
    • We inserted partial Teflon rings into some of the cells, but this provided no experimental advantage.
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    • personal communication
    • John Crocker (personal communication).
    • Crocker, J.1
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    • In previous work where we used a phase contrast microscope [R. V. Durand and C. Franck, Phys. Rev. E 56, 1998 (1997)], the depth of field was approximately 10 μm, compared to 2-3 μm for the present work.
    • (1997) Phys. Rev. E , vol.56 , pp. 1998
    • Durand, R.V.1    Franck, C.2
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    • note
    • Leica DMIRB with a Noran Instruments OZ confocal attachment.
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    • note
    • The background intensity at a given point was estimated by averaging the intensities of the pixels within a circle of radius equal to the CG background subtraction length scale. This local background intensity was subtracted from the original image.
  • 22
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    • note
    • If a given pixel has the brightest intensity in a circular region around that pixel, then the pixel is called a candidate particle. By looking in more detail at the intensity profile around each candidate particle, spurious particle identifications can be eliminated. The CG candidate particle length scale is the radius of the circular region used to determine the candidate particles.
  • 23
    • 20644436078 scopus 로고    scopus 로고
    • note
    • The intensity weighted zeroth, first, and second position moments were calculated for the intensity profile of each particle using a circular region. The radius of this region is the CG moment calculation length scale.
  • 24
    • 20644469737 scopus 로고    scopus 로고
    • note
    • The brightness (zeroth moment) is the sum of pixel intensities of the particle over a circular region equal to the CG moment calculation length scale.
  • 25
    • 20644446323 scopus 로고    scopus 로고
    • note
    • y are the characteristic lengths of the Gaussian profile in the x and y directions, respectively [see Eq. (1)].
  • 26
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    • note
    • Ironically, however, having h=0 would be too much of a good thing, because in that case, no particles would be seen, and thus no RDF could be computed. So a finite depth of field is always needed in colloidal microscopy.
  • 27
    • 20644453168 scopus 로고    scopus 로고
    • note
    • (n)(r)]. We have found that α=1 works fine for our purposes, but it is possible that smaller values could lead to better convergence properties in other cases.
  • 33
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    • -U(r)/kT)dr, where U(r) is given by Eq. (7). However, since U(2a)≫kT, Eq. (12) is essentially exact without explicitly including the hard-sphere repulsion.
    • (1972) Phys. Rev. A , vol.5 , pp. 939
    • Verlet, L.1    Weis, J.-J.2
  • 34
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    • note
    • The microscope used for the original data collection was not readily available at this later time, so instead, we used a Zeiss Axiovert 10 inverted microscope equipped with a Bio-Rad MRC600 confocal attachment.
  • 36
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    • note
    • We used an immersion conductivity probe with platinum electrodes (Yellow Springs Instrument Company, No. 3403).
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    • note
    • 3) has not dissociated, and thus the water appears pure. When the water is taken out of the column, and is away from the ion exchange resin, the carbonic acid dissociates, donating ions which subsequently lower the resistivity.
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    • note
    • eff on ρ, which we did not observe.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.