Absorption spectra of colloidal suspensions in toluene. Solid line: 10% colloids in toluene with quinizarin. Dashed line: Toluene with quinizarin. Dotted line: 10% colloids in toluene without quinizarin. The concentration of quinizarin in these samples is the same.
Concentration and temperature dependencies of of suspensions with toluene as the solvent.
Temperature dependencies of for suspensions with toluene as the solvent. The solid line shows a linear fit of the data.
(a) TEM image of the colloidal particles. (b) Size distribution of the colloidal particles.
Experimental phase diagram. Regions of high turbidity (∎) and gel-like (◻) behavior are indicated by solid and open squares, respectively. The lines are drawn to guide the eye.
(a) Translational diffusion coefficient in dependence of concentration at various temperatures. The solid lines are linear fits to the data. The dotted line is the theoretical concentration dependence of hard spheres: (Ref. 24). (b) Dependence of (∎) and (엯) on the temperature. The dashed lines are guides to the eye.
Typical normalized TDFRS signals of colloidal suspensions with a volume fraction of 10% at different temperatures. The inset gives the signal for the measurement at as a function of time on a log scale.
Concentration dependence of (a) the Soret coefficient and (b) the thermal diffusion coefficient . The temperatures are (∎), (엯), (▴), (▿), and (◆). The solid lines represent the fit of data according to Eqs. (16) and (15), respectively.
Dependence of (a) the Soret coefficient and (b) the thermal diffusion coefficient as a function of temperature at various volume fractions.
The temperature at which the sign change of the thermal diffusion coefficient occurs as a function of volume fraction. has been determined from a polynomial fit (∎) of and by a linear fit (◻) of vs volume fraction, respectively.
Dependence of (a) and (b) of octadecane in toluene vs temperature. The solid lines are guides to the eye.
(a) The experimental Soret coefficient (∎) and its single (◻) and interaction contribution (⊞) as function of temperature (b) shows the corresponding plot for the thermal diffusion coefficient. The volume fraction of the colloidal dispersion is . The solid lines are linear fits to the data.
Temperature dependence of characteristic parameters for colloid/toluene dispersions. The parameters were obtained by DLS using a volume fraction of colloids around 0.25%.
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