Polyelectrolyte adsorption kinetics under an applied electric potential: Strongly versus weakly charged polymers

Electrochemical quartz crystal microbalance study of polyelectrolyte film growth under anodic conditions

“…Previous studies of PLL deposition onto anodically-addressed electrodes have primarily been performed at a constant potential [7,8,16]. Figure 6 shows the same parameters and observables as Figure 4 and Figure 5 for one such experiment where a potential of 1.3 V vs. Ag/AgCl was applied for 600 s followed by 1 V for 600 s in a repeated fashion for a total series of 10 steps.…”

“…Others have reported the electrochemical desorption of LbL films containing PLL with potential biological applications such as cell release [3,[11][12][13]. In the case of LbL thin film assembly, the construction of films by alternately adsorbing positively-and negatively-charged polyelectrolytes has been investigated using optical waveguide lightmode spectroscopy (OWLS) or ellipsometry with indium tin oxide (ITO) as the substrate [6,11,12,14,15] van Tassel et al have also reported the continuous adsorption of a polyelectrolyte under an applied anodic potential [7] via a similar adsorption process for both strongly-and weaklycharged polymers [8,16], and hypothesized that the film growth mechanism changes during the process [8], resulting in a different orientation of the polymer chains (secondary structure). The assembly of thin films of chitosan by anodic electrodeposition has also recently been reported [17].…”

In situ synthesis of poly(N-vinylimidazole)/montmorillonite nanocomposites using intercalated monomer and thermal properties

“…14,15 Poly(N-vinylimidazole) (PVI) is interesting to work with because: (i) it is relatively simple to synthesize and purify to produce a reasonably sharp molecular weight distribution, 16 and (ii) due to the tertiary amine groups, VI monomer can be used as an intercalated agent for the synthesis of nanocomposites. It has been already used in various studies such as adsorption of PVI onto different surfaces, [17][18][19][20][21] nanocomposites of PVI with CNT and graphene, 22,23 immobilization of Cu(II)/PVI complex on magnetic nanoparticles, 24 catalytic activity of PVIgrafted SiO 2 25 and PVI-zinc complex for CO 2 separation. 26 But nanocomposite materials derived from PVI and clay minerals are scarce.…”

Cleaning requirements for silica‐coated sensors used in optical waveguide lightmode spectroscopy

“…The importance and effect of cleaning methods for optical sensing have been discussed in the literature, but few reports describe cleaning methods on surfaces that require strict control of morphology and surface properties of a diffraction grating, and there is no universally accepted cleaning protocol for use in this context . Methods used for cleaning silica surfaces generally include solvent/acid mixtures, hydrogen peroxide‐based solutions, surfactant washes and/or plasma, or UV/O 3 . Typically, for repeated use of biosensors, the most important measure of cleaning success is provision of a surface enabling reproducible detection of solute adsorption .…”

“…[7,11] Methods used for cleaning silica surfaces generally include solvent/acid mixtures, [7] hydrogen peroxide-based solutions, [10,11] surfactant washes [6] and/or plasma, [12][13][14][15] or UV/O 3 . [16,17] Typically, for repeated use of biosensors, the most important measure of cleaning success is provision of a surface enabling reproducible detection of solute adsorption. [11] As discussed by Calonder et al, [18] in order to compare independent OWLS data sets in a quantitative way, it is important to use the same waveguiding surface each time.…”