Complexes of fluorinated, silicone and hydrocarbon surfactants with carboxymethylcellulose and their influence on properties of the alumina suspension

Abstract

The aim of this study was to investigate the influence of different types of surfactants on the adsorption, stability, and electrokinetic properties of the carboxymethylcellulose/alumina system as well as the interactions between the surfactants and the polymer. The authors decided to use fluorinated and silicone surfactants besides the conventional hydrocarbon ones. The obtained results showed that carboxymethylcellulose (cmc) adsorption increased in the presence of surfactants due to the formation of polymer-surfactant complexes (the increase of the adsorption from about 0.020 mg m −2 for pure cmc to 0.030 mg m −2 for MTAB/cmc and SJ2/cmc mixtures). The obtained complexes of 0.00336% MTAB/cmc and 0.004% S-106a/cmc reduced the surface tension of water more efficiently than pure surfactants of the same concentration (from 70.06 to 62.39 mN/m and 71.06 to 64.26 mN/m respectively). Stability of the alumina suspension was studied as well. The obtained results indicate that the addition of carboxymethylcellulose, surfactants, and the cmc-surfactant complexes leads to the increase of alumina suspension stability. The mechanism responsible for stabilization was electrosteric one. The largest stability was observed for the systems containing the mixture of cmc and surfactants. The reason for this is the formation of the adsorption layer composed of alternately arranged regions of polymer and surfactant complexes. Electrokinetic measurements of the studied systems allowed to describe the structure of the electrical double layer and to determine the point of zero charge of alumina (pHpzc ≈ 7.5). The addition of the polymer as well as surfactants leads to the charge reversal of alumina.

Influence of Zwitterionic CAPB on Flocculation of the Aqueous Cationic Guar Gum/Glauconite Suspensions at Various pH

“…According to the obtained results, the value of the CMC for CAPB does not depend on pH and equals about 0.1%, which is consistent with the literature data [38]. In the systems with CGG where strong interactions between CAPB and CGG are observed, the values of CMC and T2' cannot be determined [39,40]. The results show also that the According to the obtained results, the value of the CMC for CAPB does not depend on pH and equals about 0.1%, which is consistent with the literature data [38].…”

“…The results show also that the According to the obtained results, the value of the CMC for CAPB does not depend on pH and equals about 0.1%, which is consistent with the literature data [38]. In the systems with CGG where strong interactions between CAPB and CGG are observed, the values of CMC and T 2 ' cannot be determined [39,40]. The results show also that the formation of the intermolecular polymer-surfactant complexes between CGG and CAPB takes place.…”

Upgrading the Properties of Ceramic-Coated Separators for Lithium Secondary Batteries by Changing the Mixing Order of the Water-Based Ceramic Slurry Components

“…(2) As the DLSS concentration increases after the saturation point (0.1 wt.% in our experiments), the reversed micelles are formed, and they can promote the aggregation of Al2O3 to achieve the largest entropy, reducing dispersion stability [21][22][23]. Surface interactions between inorganic particles and surfactant molecules form the basis for slurry stabilization [23,24]. Al 2 O 3 particles have a net positive surface charge (20.30 ± 4.98 mV).…”

“…In contrast, DLSS has negatively charged anionic sulfonate heads, and CMC has a negative surface charge density (−58.40 ± 3.76 mV). This implies that both DLSS and CMC can be adsorbed to the Al 2 O 3 surface, so the properties of the aqueous ceramic coating slurries are affected by various factors: (1) the mixing order of slurry components and (2) the interaction between the slurry components (i.e., the interaction between Al 2 O 3 and DLSS, and the interaction between Al 2 O 3 and CMC) [24][25][26].…”

Study on Factors Influencing the Viscosity of Sodium Carboxymethyl Cellulose Used in Capsule-Mucous Sealers

“…Experimental Equipment. CMC-Na is generally used as the material for pluggers in coal mines [39][40][41][42]. To accurately measure the CMC-Na solution viscosity under high-pressure gas conditions [43][44][45], an NDJ-5 series rotary digital viscometer produced by China Shanghai Fangrui Instrument Co., Ltd., was used in this study.…”