Advances in Chemistry Research, volume 21 by James C. Taylor

By James C. Taylor

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Additionally, significantly lower concentration of di-thiols was needed to enhance bismuth’s antibacterial activity. MICs of 2:1 molar ratio of BisBAL, BisEDT, and BisPYR summarized in Table 1 suggest that beyond MICs these bismuth thiols would exhibit significant antibacterial effects, causing cell death and lysis. Specifically, moderate concentrations (5-7 μM BisBAL, 2-3 μM BisEDT, and 7-10 μM BisPYR for S. marcescens and 11-12 μM BisBAL, 6-7 μM BisEDT, and 5-7 μM BisPYR for E. coli) were found to hamper bacterial growth.

This particle distribution is anisotropically distorted on application of strain, and the placement entropy of the particles decreases accordingly. This decrease gives rise to the viscoelastic stress that relaxes when the particles undergo translational diffusion (Brownian motion) to recover their isotropic distribution [4857]. Rheology of Carbon Black Suspensions 41 CB-76/Varnish-2 3 log tan δ 2 1 0 -1 -1 0 1 2 -1 log (ω/rad s ) Figure 8. Frequency dependence of the loss tangent, tan , of the CB-76/Varnish-2 suspensions having various cCB.

CB-15-2 is higher structure grades containing more branched aggregates. AcB has the highest DBP absorption value among CB samples studied here, although the primary particle size is not the smallest. 5 wt% for CB-24-1, to 10 wt% for CB-15-2 suspension, and to 3 wt% for AcB suspension. . Figures 9(a), (b), (c), and (d) show the shear rate  dependence of the steady shear viscosity  of the CB-76 (a), CB-24-1 (b), CB-15-2 (c), and AcB (d) suspensions having various CB concentrations cCB. The suspending medium . (PS/DBP solution) shows a constant viscosity independent of  and exhibits a Newtonian flow.

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