By Martin V. Smalley

In a unprecedented, over-the-shoulder point of view of a number one scientist’s personal breakthroughs, Clay Swelling and Colloid balance places emphasis on major paradigm shifts in colloid technological know-how that designate particle interactions for charged plates, stacks, suspensions, and pastes in addition to round colloids.

Martin Smalley first discusses the substitute of the DLVO thought with the Coulombic charm thought to provide an explanation for the lifestyles, volume, and houses of the two-phase zone of colloid balance. utilizing the n-butylammonium vermiculite method as his version clay approach, the writer clarifies the issues of traditional theories and provides the experimental info that shape the root of his new theories. He presents rigorous derivations that position the hot electric idea for charged colloids on an organization beginning in statistical mechanics. the writer illustrates why a brand new, quantitative bridging flocculation version for polymer-stabilized colloids needs to substitute the depletion flocculation version. Smalley additionally examines the invention of the ''dressed macroion'' constitution of clay plates in resolution, the constitution of a bridging polymer, and the distribution of polymer segments, counterions, and water molecules within the interlayer area.

Based at the author’s personal study and 36 courses within the box, Clay Swelling and Colloid balance isa self-contained and intellectually pleasing account of the progressive approach resulting in a universally sound, and more and more appropriate, thought of colloid balance.

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Example text

The introduction of the van der Waals potential in combination with a Yukawa potential produces a curve in which the primary minimum is always deeper than the secondary minimum. This must be so because the primary minimum state is that for which the particles have coalesced and the valency of the nth plate Zn has dropped to F → 0 as X zero: since Zn → 0 as Xmn → 2a, U mn mn → 2a, and the van der Waals force introduced to explain the existence of the secondary minimum must be stronger at the primary minimum separation.

2. 2 is equal to 2, and the new theory gives F = U mn e −κ X 8π e 2 Zm Zn ε κ proving that the calculations give identical results for the Helmholtz free energy in this limit. Both theories are based on the calculation of the electrical contribution to the free energy of the region bounded by the macroions. In both theories it is assumed that (a) the motion of the macroions is adiabatically cut off from that of the simple 28 Clay Swelling and Colloid Stability ions and (b) the distribution of simple ions is determined by the Boltzmann distribution.

The virtually incompressible volume V* is irrelevant as the thermodynamic variable for describing the properties of the macroionic solution: the behavior of the system must be described in terms of the variable V, whose value is determined by the equilibrium condition (not set equal to V* a priori) and which depends on the configuration of the macroions. 1. 1b — is shown for comparison. In this case, the macroionic particles are homogeneously distributed throughout the bulk of the solvent medium in which they are dispersed.

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