By Abraham Ulman
The improvement of orientated natural monomolecular layers through the Langmuir-Blodgett (LB) and self-assembly (SA) suggestions has led researchers towards their target of assembling person molecules into hugely ordered architectures. therefore the constantly growing to be contribution of LB and SA structures to the chemistry and physics of skinny natural movies is well known. both recognized is the trouble in maintaining thus far with the burgeoning multidisciplinary learn during this quarter. Dr. Ulman offers an important survey of the to be had literature. The e-book starts with a piece on analytical instruments to increase the certainty of the constitution and homes of monolayers and flicks. Following sections talk about LB movies, the guidance and homes of SA monolayers and movies, the modeling of LB and SA monolayers, and the appliance of LB and SA movies.
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Extra resources for An Introduction to Ultrathin Organic Films. From Langmuir–Blodgett to Self-Assembly
Sample text
18 where μηα I e n e t represents the net apparent dipole moment for the monolayer, (μιΙε{) represents the apparent dipole of the head-group region, and (μ2/ε2) is that of the hydrocarbon tail region. 13 [155, 173, 177]. The ε values represent the permittivity or dielectric values in the various regions. 18, (μλΙελ), should be constant for all monolayers and can be equated with the intercept value of μ η 6 ΐ / £ n e t for η = 0. 18 with η can be equated with either μ 2 or ε 2 , or both, varying as the carbon number η is increased.
17 There is a large body of literature on surface potential. Starting in the mid1960s, surface potential measurements were used to investigate phospholipid 23 1 1 monolayers [94-120]; the interaction of such monolayers with ions and charged macromolecules [121-132]; monolayers of fatty acids; and sulphate, sulfonate, phosphate, and phosphonate derivatives [133-151]. , long-chain alcohols) [155, 156], and polypeptides [167-161] also were carried out. Other systems that were studied are monolayers of porphyrins [162, 163], ionophores [164-167], and enzymes [168].
This is an interesting observation, since it means that the system began in a pseudohexagonal phase, where the CCC planes of the molecules are partially oriented, and was transformed slowly to the hexagonal phase, where these planes are randomly oriented about their chain axes. For this to happen, the chains also should become less tilted; however, the authors do not discuss tilt angles in this paper. Grundy et al. studied the structure of docosanoic acid ( C 2 1 H 4 3 C O O H ) monolayers at the water-air interface, and found that in the condensed phase of cadmium docosanoate, the molecules are perpendicular to the surface [250].