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Polymers charge reversal

Ionic polymers Adsorption on capillary wall With positively charged polymers, flow reversal... [Pg.195]

RPC-5 and other mixed mode chromatographic techniques are based on ionic as well as on hydrophobic interactions. RPC-5 is the earliest of these techniques having been introduced more than 20 years ago [26]. The resin applied originally consists of a charged reversed-phase matrix with a quaternary ammonium derivative (such as methyltrialkyl (Cg-Cjo) ammonium chloride) being adsorbed on a non-porous polymer support such as Plaskon or Teflon. In contrast to other HPLC-resins, the surface-forming groups of RPC-5 are physically adsorbed to the polymeric support and are not covalently bound therefore RPC-5, in principle, can be called a... [Pg.94]

Fig. 1 LbL assembly onto a colloidal substrate, (a) Electrostatic adsorption onto a chaiged template results in (b) charge reversal of the surface, (c) A second polymer layer, oppositely chaiged to the first, can then be deposited on the surface, (d) This process is repeated until the desired number of layers is deposited, (e) if a sacrificial template is used, the core can be removed to form a hoUow capsule... Fig. 1 LbL assembly onto a colloidal substrate, (a) Electrostatic adsorption onto a chaiged template results in (b) charge reversal of the surface, (c) A second polymer layer, oppositely chaiged to the first, can then be deposited on the surface, (d) This process is repeated until the desired number of layers is deposited, (e) if a sacrificial template is used, the core can be removed to form a hoUow capsule...
Preformed polymer chains adsorb on the surface, usually accompanied by charge reversal... [Pg.13]

Han, L. Zhao, J. Zhang, X. Cao, W. Hu, X. Zou, G. Duan, X. Liang, X.-J. Enhanced siRNA delivery and silencing gold-chitosan nanosystem with surface charge-reversal polymer assembly and good biocompatibility. ACS Nano 2012, 6, 7340-... [Pg.414]

Figure 5. (a) Force—distance curves recorded upon compression of PLL(20)-g-PEG(2) polymer adlayers on niobiaby aSi02 microsphere in 10 mM HEPES buffer solution (pH 7.4), with PEG chain densities from 0 to 0.54 PEG nm". (b) Surface potential from DLVO fits (not shown) as a function of the grafting ratio, g, of the PLL-g-PEG polymer, highlighting charge reversal at g = 4. [Pg.294]


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See also in sourсe #XX -- [ Pg.352 ]




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