Adsorption of Polymers - Nature
Adsorption of Polymers In the former case, is, in principle, independent of v, although for the three dimensional case that we will consider exclusively, the numerical values of both exponents
Consequences of competitive adsorption between polymers on
When the polymers added to the system are both adsorbing species, a competitive adsorption may occur. The outcome of this adsorption competition between molecules shall dictate the rheological behaviour of the SCC. In this work, we studied the competitive adsorption of a so-called viscosity agent and of a plasticizer molecule.
Enhancement of plasticizer adsorption by utilizing a rice
An isotherm adsorption study was performed by testing different plasticizer concentrations (10–100 mg/L) at a fixed pH, adsorbent dose, adsorption time, and temperature. The same operational steps were repeated at different adsorption temperatures (30–60 °C) to obtain adsorption isotherm data.
THE ROLE OF SOLVENT QUALITY AND OF COMPETITIVE ADSORPTION ON
-activated systems, the adsorption behaviour of the polymers was also significantly 21 altered. Here, this was not caused by a low calcium concentration or by a preferential adsorption 22 of the superplasticizer on calcite crystallites. The most plausible explanation was a competitive adsorption with CO 3 23 2-ions.
Competitive Adsorption of Functionalized Polymers | Langmuir
The adsorption and desorption of functionalized polystyrene-block-polybutadiene diblock copolymers from dilute solutions in toluene onto silicon wafers are investigated by means of null ellipsometry. The short polybutadiene block is functionalized by a reaction with 4-(3,5-dioxo-1,2,4-triazolidin-4-yl)benzoic acid. On the average there are six functional groups per chain. The polystyrene block
- What is competitive adsorption of polymers?
- Let us examine some characteristic examples of the competitive adsorption of polymers. Competitive adsorption was studied for polyoxyethylene (POE) and a nonionic surfactant such as POE-alkyl ether on the silica gel surface from aqueous solution . Complexes of the polymer and surfactant were not observed in the solution.
- Why do admixed superplasticizers increase adsorption capacity?
- The results indicate that the increase in the adsorption capacity of the admixed superplasticizer is due to synergistic adsorption rather than competitive adsorption. As the proportion of PCE is reduced, there is a notable decrease in ALT, whereas the proportion of BNS is associated with a decrease in the absolute value of zeta potential.
- Do superplasticizers adsorb on cement particle surfaces?
- Importantly, the adsorption of superplasticizers on cement particle surfaces is a prerequisite for their dispersion effect. Consequently, an investigation was conducted to assess the adsorption of superplasticizers under varying addition sequences.
- Can competitive adsorption modulate the growth of nanocrystals?
- Thus, the competitive adsorption between PVP and CPK leads to the precise modulation of the growth of these nanowires, which can be further illustrated by density functional theory. This work presents new opportunities to modulate the synthesis of nanocrystals by competitive adsorption between polymer ligands and their monomeric analogs.
- Does admixed superplasticizer repulsion affect intermolecular force between PCE and BNS?
- The AFM test demonstrate that the force between PCE and BNS is negative, indicating an attractive interaction between the admixed superplasticizers. The overall intermolecular force undergoes a shift from repulsion between the same superplasticizer to attraction between the admixed superplasticizers.
- Does the sequence of superplasticizer addition affect adsorption?
- To investigate the influence of the sequence of superplasticizer addition on adsorption, one superplasticizer was first adsorbed onto the cement at its equilibrium concentration, followed by the addition of another superplasticizer at varying concentrations.
