Stearic acid coating, phases

A vast literature exists on the surface modification of CaC03 mineral with SA [3] including information in Chapter 6. Recently, Khanna et al. [5] have investigated the nature of surface interactions between CaC03 and SA. Using multiple analytical techniques, they have been able to identify and quantify as many as four different phases of stearic acid coating applied at the monolayer concentration ... 

In the second case, Lorenzo et al. prepared poly(ethylene terephthalate) (PET)/ CaCOs nanocomposites via in-situ polymerization, and the effects of surface treatment on the dispersion morphology and thermal behavior of the nanocomposites were studied. For untreated nano-CaCOs, a large number of very small discrete particles were observed. For the nanocomposites with stearic acid treated nano-CaCOs the discrete particles were still evident, but they were better welded to the PET matrix, suggesting that the stearic acid coating improves adhesion between the nano-CaCOs and the PET matrix. The improved compatibility between the phases is probably due to the hydrophobic characteristics of the treated nano-CaCOs imparted by the stearic acid coating. 

Polyolefins, polypropylene, polyethylene Soxhlet extracts Capillary SEC. Column 10 m x 50 pm i.d. fused silica capillary coated with cross-linked 5% phenyl-methypolysiloxane (0.4-pm film). Mobile phase = CO2. Various temperature and pressure gradients used. Detection = FID at 300°C Stearic acid, Irganox 1010 Eganox PS 802, Atmos 150 Mono- and di-glycerides Alkenes, cycloalkanes 33... 

The concept of ATR at the interface of two media is described in 1.4.10° and Section 1.8.3. In situ ATR measurements of ultrathin films started in the mid-1960s with studies of the adsorption of a stearic acid monolayer from D2O onto Ge [448], and chemical [449] and electrochemical [450] oxidation of Ge, where a Ge multiple internal reflection element (MIRE) acts as both the substrate and the electrode. Later, coated ATR [60, 451-454] and MO ATR with the SEIRA effect [455] were introduced in in situ experiments. The principal advantage of the ATR geometry is that the corresponding in situ cells are free from diffusion effects (the volume of solution phase in contact with the IRE is arbitrary), which is useful when studying time-dependent phenomena (Section 4.9.1). 

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