By Guangming Liu, Guangzhao Zhang
QCM-D experiences on Polymer habit at Interfaces stories the purposes of quartz crystal microbalance with dissipation (QCM-D) in polymer learn, together with the conformational swap of grafted polymer chains, the grafting kinetics of polymer chains, the expansion mechanism of polyelectrolyte multilayers, and the interactions among polymers and phospholipid membranes. It specializes in how QCM-D will be utilized to the learn of polymer habit at numerous solid-liquid interfaces. furthermore, it basically unearths the actual value of the adjustments in frequency and dissipation linked to the several polymer behaviors on the interfaces.
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Extra resources for QCM-D Studies on Polymer Behavior at Interfaces
Additionally, from A to C, a larger change in Df is observed for CaCl2 than that for MgCl2. This can be explained by the formation of relatively strong ion pairs between Ca2+ and the weakly hydrated alkyl sulfonate groups since the strength of hydration of Ca2+ is weaker than Mg2+ . In Fig. 17, the change in DD further demonstrates the conformational change of grafted PSS chains in CaCl2 and MgCl2 solutions. 0 9 10-3 M (A to B), indicating the formation of a loose and inhomogeneous layer. 0 9 10-2 M (B to C), the decrease in DD indicates that the layer becomes denser.
In general, the formation of PEMs G. Liu and G. 1007/978-3-642-39790-5_4, Ó The Author(s) 2013 45 46 4 Growth Mechanism of Polyelectrolyte Multilayers is influenced by temperature [8–10], pH [11–13], ionic strength [14–16], ion type [17–20], solvent quality [21–23], molecular weight [24, 25], chain rigidity [26– 28], and chain architecture [29–31]. However, the exact mechanism of how the growth of PEMs is influenced by the external conditions and the intrinsic properties of polyelectrolyte chains still remains elusive.
The large increase in DD in regime III is indicative of the acceleration of the grafting and the increase of thickness of the polymer layer. As discussed above, the interaction between PNIPAM segments and the gold surface is strong, thus, PNIPAM chains are not only grafted with their end groups but also adsorbed with their segments on the gold surface. At a low grafting 36 3 Grafting Kinetics of Polymer Chains Fig. 3 Dissipation shift (DD) of the resonator immersed in the HS-PNIPAM solution as a function of logarithmic time, where the overtone number n = 3.