Download Technology of dispersed systems and materials: by Naum B. Uriev PDF
By Naum B. Uriev
Written via the founding father of the sphere, this practice-oriented advisor summarizes the author's step forward examine effects and their functions in chemical technology.
The e-book adopts a completely novel strategy, describing the actual chemistry of constitution formation and fabrics synthesis lower than dynamic stipulations. It starts through constructing the final idea within the first chapters with as little arithmetic as important and substantiated by means of experimental ends up in each one case. the subsequent chapters care for the elemental features of rheology, vibrorheology, and superfluidity of established dispersed platforms in the framework of physicochemical dynamics, whereas the ultimate bankruptcy exemplifies the technological purposes of the constructed method utilizing real-life difficulties of fabrics technological know-how and chemical engineering.
The authoritative consultant to physicochemical dynamics
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Additional resources for Technology of dispersed systems and materials: physicochemical dynamics of structure formation and rheology
Example text
4 Character of solid-phase surface wetting in the case of (a) hydrophobic and (b) lyophilic (hydrophilic toward water) surfaces: ???? is the wetting angle between the solid-phase surface and the tangent line to the liquid drop surface at the site of contact with the solid surface [1], according to ???? −???? Young’s law [10]: cos ???? = sg???? sl . 6) where B is the Lifshitz constant [9]. An important result obtained in calculation of dc for typical values of A ∼ 10−19 to 10−20 J, B ≈ 10−28 J m, ???? ∼ 2 consists in the fact that dc ≫ 1 μm and can reach 100 μm and even more.
6). This means that highly dispersed materials a priori have higher porosity. In particular, one can compare, for example, natural rock materials of volcanic origin: abyssal and extrusive. ) due to slow lava cooling under high pressure, form a coarse crystalline structure under slow cooling. , basalt and diabase) are formed under 21 22 2 Structure Formation in Dispersed Systems and Materials the conditions of fast cooling. Due to melt solidification, their structure is finely crystalline, as large crystals do not have enough time to grow due to fast growing melt viscosity.
Ultimately, it is the structure strength that determines its stability under dynamic conditions. 9) where ???? is the number of contacts between particles per unit surface. 10) 2 d where ???? is a coefficient close to 1 that characterizes the packing geometry; n is the number of particles per unit volume; f (????) is the function of bulk particle content; d is the average characteristic particle diameter. ph. ph. ph. ph. ph. ph. ph. is the gas-phase (air) volume. 5 (b) dependence and (b) the dependence found using percolation theory [15]; points correspond to experimental data [14].