By Richard G Weiss, Pierre Terech
ISBN-10: 1402033524
ISBN-13: 9781402033520
ISBN-10: 1402036892
ISBN-13: 9781402036897
"Molecular Gels: fabrics with Self-Assembled Fibrillar Networks" is a finished treatise on gelators, particularly low molecular-mass gelators and the houses in their gels. The constructions and modes of formation of the self-assembled fibrillar networks (SAFINs) that immobilize the liquid elements of the gels are mentioned experimentally and theoretically. The spectroscopic, rheological, and structural positive aspects of the various sessions of low molecular-mass gelators also are offered. Many examples of the applying of the vital analytical ideas for research of molecular gels (including SANS, SAXS, WAXS, UV-vis absorption, fluorescence and CD spectroscopies, scanning electron, transmission electron and optical microscopies, and molecular modeling) are offered didactically and in-depth, as are a number of of the theories of the phases of aggregation of person low molecular-mass gelator molecules resulting in SAFINs. a number of genuine and capability purposes of molecular gels in disparate fields (from silicate replication of nanostructures to artwork conservation) are defined. unique emphasis is put on views for destiny advancements.
This e-book is a useful source for researchers and practitioners both already discovering self-assembly and gentle subject or new to the realm. those that will locate the booklet worthy contain chemists, engineers, spectroscopists, physicists, biologists, theoreticians, and fabrics scientists.
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Extra resources for Molecular gels : materials with self-assembled fibrillar networks
Sample text
The segment number n is varied from curve to curve. Binodals (solid lines) and spinodals (broken lines) are drawn. The critical solution points are indicated by open circles. The LCST and UCST approach and eventually merge into an hourglass upon increasing the polymer molecular weight. The phase separation loop vanishes by decreasing the polymer molecular weight. (Reprinted with permission from [41]. Copyright (1990) The American Physical Society) shape. The miscibility loop shrinks with decrease in the molecular weight, and eventually vanishes at a certain critical molecular weight (n = 37 in Figure 7).
The number of contacts between the two species may change by molecular association, and hence the mixing enthalpy (the last term of Eq. (5)) may be modified. We assume here, however, that the same form remains valid after association except when the modification is significant due to polymer conformational change etc. We modify this term whenever necessary. The total free energy from which our theory starts is given by the sum of the above two parts (Figure 1): F= Frea + Fmix . (6) We next derive the chemical potentials of the clusters to study the solution properties.
The Sharpness in their appearance is controlled by the curvature of the function δl + 1/ l − 1 around l ∗ . At the cmc, l0 = l ∗ . In the case where l ∗ is infinite, a macroscopic cluster appears as soon as x exceeds the critical value x ∗ ≡ exp(δ ∗ − 1). The macroscopic clusters can be branched networks (SAFIN gels) [4, 5], infinitely long polymers [33], or wormlike micelles [78–80]. For brevity, we call the former case gelation and the latter case polymerization (including worm-like micellization) (Precisely, worm-like micelles formed by hydrophobic association fall in the category of multiple association described below.
Molecular gels : materials with self-assembled fibrillar networks by Richard G Weiss, Pierre Terech
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