Charged-polystyrene

Electrophoresis measurements provide a qualitative indication of the assembly of polymer multilayers on colloids [49,50], The -potential as a function of polyelectrolyte layer number for negatively charged polystyrene (PS) particles coated with poly(diallyldimethylam-monium chloride) (PDADMAC) and poly(styrenesulfonate) (PSS) are displayed in Figure... [Pg.510]

The formation of the biopolymer dextran is a complex process, where the fructose is known to inhibit the polymer chain growth. Consequently, the separation of the fructose from the reaction zone results in a higher molecular mass of the dextran even at high initial sucrose concentration [173]. In a first investigation, a fixed-bed chromatographic reactor was filled with calcium charged polystyrene. Fructose was retarded on this matrix while the dextran was prevented... [Pg.196]

Figure 10.8 Chemical structures of positively charged polyethyleneimine (PEI), polyallyl-aminhydrochlorid (PAH), polylysine hydrobromide (PL) and negatively charged polystyrene-sulfonate (PSS). M+ denotes a metal ion such as Na+.

These applications require a good knowledge of the nature and magnitude of interactions between nucleic acids and polymer particles. To that purpose, many systematic studies were carried out by different authors and in this lab on the adsorption behavior of various nucleic acids onto various type latex microspheres, mostly cationic and anionically-charged polystyrene or hydrophilic (i.e. poly[N-isopropylacrylamide]) latex particles. [Pg.171]

Figure 4.16. Velocity profile for negatively charged polystyrene latex particles In a rectangular cell with mica surfaces. or O and -i refer to different field directions, (a) u(X) (b) o(X - X ]. (Redrawn from Debacher and Ottewlll, loc. clt.)...

Figure 4.19. Streaming potentials obtained with the cell of fig. 4.18. Negatively charged polystyrene latex. Concentration of electrolyte (KCl) indicated.

In the previous section the strong affinity of cationic surfactants for negatively charged polystyrene latices was noted. This concept of a single positive ion interacting with a negative charge on a surface can be extended... [Pg.37]

Figure 6.29 Zero-shear relative viscosity versus particle volume fraction for aqueous suspensions of charged polystyrene spheres (a = 34 nm) in 5 x lO " M NaCl ( ) (Buscall et al. 1982a). The line is calculated by using Eq. (6-66) for the viscosity, with 0eff given by Eq. (6-64), and d ff by Eq. (6-67a) or (6-67b). The potential 1T(/ ) is given by Eq. (6-58) or (6-59) with k given by Eq. (6-61) the constant K is 0.10, and is in the range 50-90 mV. (From Buscall 1991, reproduced with permission of the Royal Society of Chemistry.)...

$Figure 6.29 Zero-shear relative viscosity versus particle volume fraction for aqueous suspensions of charged polystyrene spheres (a = 34 nm) in 5 x lO " M NaCl ( ) (Buscall et al. 1982a). The line is calculated by using Eq. (6-66) for the viscosity, with 0eff given by Eq. (6-64), and d ff by Eq. (6-67a) or (6-67b). The potential 1T(/ ) is given by Eq. (6-58) or (6-59) with k given by Eq. (6-61) the constant K is 0.10, and is in the range 50-90 mV. (From Buscall 1991, reproduced with permission of the Royal Society of Chemistry.)...$

Figure 6.31 High-frequency modulus Goo versus particle volume fraction (p for charged polystyrene latices of radius a = 26.3 nm (O). 34.3 nm ( ), 39,2 nm (A), and 98.3 nm (A) in aqueous solutions with 5 X lO" M NaCl. The lines are the predictions of the theory of Buscall et al. (1982b) for an FCC lattice with = 12 and (pm = 0.74, and a best-fit value of increasing from 50 to 89 mV as the particle radius increases from 26.3 to 98.3 nm. These predictions differ from Eq. (6-70) only in that a prefactor (3/32) in Buscall et al. (1982b) was corrected to 1 /(5n) in Buscall (1991), (From Buscall et al. 1982b, reproduced with permission of the Royal Society of Chemistry.)...

$Figure 6.31 High-frequency modulus Goo versus particle volume fraction (p for charged polystyrene latices of radius a = 26.3 nm (O). 34.3 nm ( ), 39,2 nm (A), and 98.3 nm (A) in aqueous solutions with 5 X lO" M NaCl. The lines are the predictions of the theory of Buscall et al. (1982b) for an FCC lattice with = 12 and (pm = 0.74, and a best-fit value of increasing from 50 to 89 mV as the particle radius increases from 26.3 to 98.3 nm. These predictions differ from Eq. (6-70) only in that a prefactor (3/32) in Buscall et al. (1982b) was corrected to 1 /(5n) in Buscall (1991), (From Buscall et al. 1982b, reproduced with permission of the Royal Society of Chemistry.)...$

Figure 6.33 Shear stress as a function of shear rate for a = 73 nm charged polystyrene spheres at a volume fraction of 0 = 0.33 in 10 M KCl. The various symbols stand for measurements made under different conditions, namely, increasing shear rate (O), decreasing shear rate (Q), constant stress ( ), or metastable shear rates ). SC denotes the strained-crystal configuration shown in Fig. 6-32b, SL is the sliding-layer configuration in Fig. 6-32c, and PC is an intermediate polycrystalline configuration, (From Chen etal. 1994, with permission from the Journal of Rheology.)...

$Figure 6.33 Shear stress as a function of shear rate for a = 73 nm charged polystyrene spheres at a volume fraction of 0 = 0.33 in 10 M KCl. The various symbols stand for measurements made under different conditions, namely, increasing shear rate (O), decreasing shear rate (Q), constant stress ( ), or metastable shear rates ). SC denotes the strained-crystal configuration shown in Fig. 6-32b, SL is the sliding-layer configuration in Fig. 6-32c, and PC is an intermediate polycrystalline configuration, (From Chen etal. 1994, with permission from the Journal of Rheology.)...$

Figure 7.12 Shear-stress dependence of the relative viscosity for dispersions in water of charged polystyrene particles of radius a = 115 nm with nonadsorbing Dextran T-500 polymer (synthesized from glucose) added as a depletion flocculant. The polymer molecular weight is 298,(HX), and its radius of gyration Rg is 15.8 nm. Volume fractions and polymer concentrations are

$Figure 7.12 Shear-stress dependence of the relative viscosity for dispersions in water of charged polystyrene particles of radius a = 115 nm with nonadsorbing Dextran T-500 polymer (synthesized from glucose) added as a depletion flocculant. The polymer molecular weight is 298,(HX), and its radius of gyration Rg is 15.8 nm. Volume fractions and polymer concentrations are <p = 0.3, Cp = 2.5 wt% ( ), 0 = 0.2, Cp = 2.5 wt% ( ), and (p = 0.2, Cp — 0.5 wt% (O)- (From Patel and Russel 1987, with permission from the Journal of Rheology.)...$

Figure 7.13 Compressional, Py, and shear, ay, yield stresses versus particle volume fraction

$Figure 7.13 Compressional, Py, and shear, ay, yield stresses versus particle volume fraction <p for dispersions in water of charged polystyrene particles of radius a = 245 nm coagulated by addition of BaCl2. (From Buscall et al. 1987). (reprinted from J Non-Newt Fluid Mech 24 183, Bus-call et al. (1987), with kind permission from Elsevier Science - NL, Sara Burgerhartstraat 25, 1055 KV Amsterdam, The Netherlands.)...$

Figure 7 Correlation of plateau values with protein surface hydrophobicity (from hydrophobic interaction chromatography data) for the adsorption of egg-white lysozyme ( ), bovine pancrease ribonuclease (A), a-lact-albumin (x), sperm whale myoglobin ( ), and superoxide dismutase ( ) on negatively charged polystyrene in 50 mM KCI at 25°C and pH equal to pi of each protein. (From Ref. 17. Reprinted with permission.)...

On positively charged polystyrene at pH 7 the rmax values increase in the order lysozyme negative charge at these conditions) in accordance with their net electrostatic attractions (or repulsions) to the surface [17]. On negatively charged polystyrene the relative positions of the plateau values are nearly reversed, but... [Pg.23]

Zeolite shells on polystyrene beads were prepared by a combination of layer-by-layer (LbL) and hydrothermal synthesis techniques. The negatively charged polystyrene beads were surface modified in order to adsorb zeolite Beta nanocrystals. Such particles were then adsorbed on the surface of the beads and induced to grow into a continuous film of intergrown crystals of zeolite Beta. The effect of the preliminary treatment on the formation of the zeolite film was studied. Finally the polystyrene beads used as macro-templates were removed by calcination in air, yielding hollow spheres of zeolite Beta. The zeolite Beta/polystyrene composites and the corresponding hollow zeolite spheres were characterized by XRD, SEM, TG/DTA and BET surface area measurements. [Pg.298]

Caruso et al. [69] reported the preparation of negatively charged polystyrene latex particles (640 nm diameter) armored with a nanocomposite multilayer of Si02 nanoparticles (Ludox TM-40 26 4nm diameter) and poly(diallyldimethyl-ammonium chloride) (PDADMAC). These two components were sequentially adsorbed onto the surface of the polystyrene latex spheres (see Fig. 11), after adsorption of a precursor polyelectrolyte multilayer film of PDADMAC/... [Pg.33]

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