Rheological and electrical characteristics of carbon black dispersions in apolar dielectric medium

Sobolev, A. A.; Svistunov, Yu. S.; Uriev, N. B.

doi:10.1134/s1061933x07050171

Cited by 1 publication

(7 citation statements)

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“…5 and 6 (see also Table 5), the magni tude of the dilatancy peak and the value at which it arises ( ) depend on the content of oxygen in CB. A dependence of dilatancy peak magnitude on the mass (and, hence, volume) content of CB in suspensions was revealed in [4,5]. Similar dilatancy effects were previously observed for diverse suspensions (see, e.g., [29, [31][32][33][34][35]).…”

Section: Resultssupporting

confidence: 65%

“…-shear compaction as a result of a vibration impact [5]; and -competitive disruption and formation of sec ondary structures [40] including "periodic" ones [41].…”

Section: Resultsmentioning

confidence: 99%

“…This indicates that, in the case of CB2, oxygen is present not only in the surface func tional groups, but also inside the particles [45] and part of it is not involved in the formation of their mosaic lyophilic lyophobic surface. At the same time, at a constant OD of CB particles, an increase in the con centration of CB-VO suspensions leads to a reduction in the critical value, at which the dilatancy arises, which may be explained by a rise in the probability of interparticle collisions [5]. However, at first sight, the behavior of the CB5-VO suspension does not correspond to this interpreta tion of the observed dilatancy phenomena.…”

Section: Whenmentioning

confidence: 89%

“…According to [4,5,20,21], stable surfactant free suspensions with structures of different strengths may be produced based on nongraphitic CBs with different ODs.…”

Section: Sobolevmentioning

confidence: 99%

“…In contrast to [4,5], the goal of this work was to determine the effect of the degree of lyophilicity of carbon black (CB) particles with different oxidation degrees (ODs), which are used as model current con ducting dispersed phases, on the structural, rheologi cal, and electrical characteristics of CB suspensions in apolar and polar nonaqueous dispersion media, in which the interparticle interaction is not complicated by the presence of a surfactant.…”

Section: Introductionmentioning

confidence: 99%

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Structural, rheological, and electrical properties of suspensions of carbon black with different oxidation degrees in polar and apolar dielectric dispersion media

Sobolev

2015

Colloid J

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The structural, rheological, and electrical characteristics of carbon black (CB) suspensions with different oxidation degrees of particles have been studied in polar and apolar media. The structural charac teristics have been determined for individual particles and particle aggregates of CB in a powdered form and in dispersion media. The yield stresses of CB suspensions in Vaseline oil (VO) and castor oil (CO) increase with the oxidation degree of particle surface; however, at the same oxidation degree of particles, the yield stress of suspensions in VO is, as a rule, lower than that in CO. In all suspensions, the calculated sizes of sec ondary aggregates decrease with a rise in the CB oxidation degree; however, at the same oxidation degree, the secondary aggregates in suspensions in VO are, as a rule, larger than those in suspensions in CO. Possible mechanisms of the electrical conductivity of the suspensions have been considered both at rest and under dif ferent regimes of dynamic actions. An interpretation has been proposed for the appearance and shifts of dila tantcy peaks for CB suspensions as depending on the oxidation degree of CB particle surface and the nature of a dispersion medium. SOBOLEVAccording to [4,5,20,21], stable surfactant free suspensions with structures of different strengths may be produced based on nongraphitic CBs with different ODs.EXPERIMENTAL CB samples with different ODs were obtained as follows. Initial sample (CB1) with an oxygen content of 0.5 wt % was thermally oxidized in air using a fluid ized bed process until the oxygen content reached 4.2 and 19.7 wt % (CB2 and CB4 samples, respectively). In addition, the CB5 sample with an oxygen content of 0.06 wt % was obtained by thermal treatment of CB1 at 900°C in a hydrogen flow.The physicochemical properties of these CB sam ples were analyzed in detail elsewhere [21]; the results obtained are presented in Table 1. The sizes (D a ) of CB particles forming primary aggregates were determined by transmission electron microscopy (TEM)

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Section: Resultssupporting

confidence: 65%

“…-shear compaction as a result of a vibration impact [5]; and -competitive disruption and formation of sec ondary structures [40] including "periodic" ones [41].…”

Section: Resultsmentioning

confidence: 99%

Section: Whenmentioning

confidence: 89%

“…According to [4,5,20,21], stable surfactant free suspensions with structures of different strengths may be produced based on nongraphitic CBs with different ODs.…”

Section: Sobolevmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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