Grafted surfaces

The Alexander model and its descendants impose strong restrictions on the allowed chain configurations within the tethered assembly. The equilibrium state thus found is subject to constraints and may not attain the true minimum free energy of the constraint-free system. In particular, the Alexander model constrains the segment density to be uniform and all the chain ends to be at the same distance from the grafting surface. Related treatments of curved systems retain only the second... 

The formation of a stable monobutyl species obtained at 50 °C is also further demonstrated by its hydrogenolysis at higher temperatures. Indeed, treatment under H2 of the grafted surface organometallic complex, Pts[SnBu]jy, at 300 °C for 4 h generates about one butane per Sn along with traces amounts of propane, ethane, and methane. 

Takei, Y. G., Aoki, T., Sanui, K., Ogata, N., Sakurai, Y, and Okano, T. Dynamic contact angle measurement of temperature-responsive surfaces properties for poly(Af-isopropylacrylamide) grafted surfaces. Macromolecules, 1994, 27, 6163—6166. 

In Fig. 3 we show the density profiles (normalized to unity) for four different values of obtained with the full mean-field theory [52]. hi (a) the distance from the grafting surface is rescaled by the scahng prediction for the brush height, ho and in (b) it is rescaled by the imperturbed polymer radius Ro. 

Fig. 6 Simulation results for the normalized monomer number density, p(z)Rf/Np y as a fimction of the scaled distance from the grafting surface z/fip for anchored chains of length N = 50 and grafting densities p a = 0.02, 0.04, 0.06, 0.09, and 0.17 (from top to bottom). Note thatfip is determined within the simulation for a single, free polymer chain...

Mei Y, Wu T, Xu C, Langenbach KJ, Elliott JT, Vogt BD, Beers KL, Amis EJ, Washburn NR (2005) Tuning cell adhesion on gradient poly(2-hydroxyethyl methacrylate)-grafted surfaces. Langmuir 21 12309-12314... 

Fig. 4 A Atomic force microscope (AFM) images, projected at 30° for viewing, of non-treated dithiocarbamated polymer film surface (a) and the PST(polystyrene)-grafted surface by UV irradiation through the lattice-patterned projection mask for 5 (fc), 10 (c), and 20 min (d). B Relationship between the average thickness of the PST-grafted layers and UV irradiation time...

Fig. 21 A Schematics of albumin-bound poly(N-isopropylacrylamide) (PNIPAM)-grafted surface via albuminated DC iniferter. B Hypothetical action of temperature-dependent switching of protein desorption by squeezing out and mechanical motion...

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