Monolayer on mica

Fig. XII-12. Top friction traces for two calcium alkylbenzenesulfonate monolayers on mica where the monolayers are in a liquidlike state. A—in inert air atmosphere B—in saturated decane vapor. Bottom contact radius-load curves showing adhesion energy measured under the same conditions as the friction traces. (From Ref. 53.)...

FIG. 26 Optimized structure of a water monolayer on mica obtained from molecular dynamic simulations by Odelius et al. The water molecules and the first layer of sihca tetrahedra of the mica substrate are shown in a side view in the top. K ions are the large dark balls. The bottom drawing shows a top view of the water. Oxygen atoms are dark, hydrogen atoms light. Notice the ordered icelike structure and the absence of free OH groups. All the H atoms in the water are involved in a hydrogen bond to another water molecule or to the mica substrate. (From Ref. 73.)... 

A benzo[18]crown-6 adduct (72) of Cgg (not shown) has been synthesized by the addition of the corresponding o-quinodimethane 71 in toluene [58]. The solubility of 72 in pro tic solvents such as MeOH strongly increases after the complexation of ions, as shown by extraction experiments. The combination of the crown ether and the fullerene moiety in 72 provides a highly amphiphilic character. This behavior allowed the preparation of Langmuir-Blodgett films of monolayers on mica of 72 and its complex. 

Figure 8.23 Left XPS survey spectrum recorded on palladium. Right Nitrogen IS spectrum of a surfactin/DPPC monolayer on mica. The vertical scale shows the number of counts per second. Adapted from ref. [358],...

The signal-to-noise ratio (S/N) is a very important factor in measuring the usefulness of a particular technique for measuring monolayers on mica. Most of the spectra shown are of very short scan time so that S/N can be clearly measured and compared. Since S/N improves with (scan time) the S/N levels for long scans can be easily iredicted from the spectra. 

An alternative approach to the study of monolayers on mica was to use a reflection apparatus shown in Figure 7. The mica was placed in contact with a gold coated mirror and the infrared beam passed twice through the... 

Figure 6. Spectrum of an OTS monolayer on mica recorded in the presence of CCI4.

Absorbance spectra monolayer on mica, 244/ thickness of mica sheet, 241 Absorptivity ratios, definition, 28 Acyl chains, monolayer films, 198 Adatom(s) definition, 210 surface migration, 211214... 

Fig. 48. AFM phase image of pSt-b-pBzA hybrid nanoparticle (sub) monolayer on mica. Domain assignments dark spots (polysilsesquioxane particles), dark corona around particles (tethered pSt, Mn=5,250 Mw/Mn=1.22) light continuous matrix (tethered pSt-b-pBzA), Mn= 27,280 Mw/Mn=1.48). Reprinted with permission from [338]. Copyright (2001) American Chemical Society.

Figure 8.17. Photoinduced modification of 2-D MPS nanostructures of the tri-block copolymer monolayer on mica, (a) Initial cis-rich state, (b) trans-rich state after UV irradiation, and (c) successive cis-rich state after visible light irradiation.

Claesson, P. M., Blom, C. E., Horn, P. C. and Ninham, B. W., Interactions between water-stable hydrophobic langmuir-blodgett monolayers on mica, J. Colloid Interface ScL, 114, 234-242 (1986). 

Fig. 50 Study of mixed surfactin/DPPC monolayers on mica. AFM topographic images at (a) 0.1, (b) 0.25, and (c) 0.5 surfactin/DPPC molar ratios. The DPPC domains are 1.2 nm thicker than the surfactin domains. The surfactin surface coverage (p is indicated for each molar ratio, (d) Variation of N/C XPS ratio as a function of cp measured by AFM. Circles, experimental data (two independent sets) broken line, curve computed by using experimental data for the pure monolayers and the respective surface coverages. Adapted from Ref 152 with permission from Biophysical Journal, copyright (1999) Biophysical Society...

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