Determination of the adsorbed layer thickness of functional anionic polymers utilizing chemically modified polystyrene nanoparticles

Tiemeyer, Constantin; Lange, Alex J.; Plank, Johann

doi:10.1016/j.colsurfa.2014.05.014

Cited by 30 publications

(7 citation statements)

References 20 publications

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“…In the literature, it was claimed that commercial sodium lignosulfonate (obtained from Chemische Werke Zell-Wildshausen, D€ usseldorf, Germany) had the hydrodynamic diameter of 5-6 nm. 46 The hydrodynamic diameter is correlated to molecular weight of lignin samples. As lignin has a similar subunit structure, the larger the hydrodynamic diameter, the larger the molecular weight of lignin would be.…”

Section: Charge Density and Hydrodynamic Diameter Characterizationmentioning

confidence: 99%

Characterization of four different lignins as a first step toward the identification of suitable end‐use applications

Oveissi

Fatehi

2015

J of Applied Polymer Sci

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To determine the most appropriate use of lignin, surface, structural, and thermal characteristics of lignin was investigated in this work. It was observed that kraft lignin (KL), the lignin of prehydrolysis liquor (LPHL), lignosulfonate of NSSC process (LSL), and lignosulfonates (LSs) of sulfite pulping process had 0.67, 0.25, 0.90, and 1.52-2.25 meq/g anionic charge density, and 6.3, 2.1, 10.1, and 8.8-10.1 nm hydrodynamic diameter, respectively. These results suggested that LSL and LSs could be used more effectively than other lignin as filler modifiers, flocculants, and dispersants. The combustion studies of the lignin samples suggested that KL and LPHL combusted more efficiently than other samples, as they had high heating (calorific) values of 27.02 and 19.2 MJ/kg, the apparent activation energy of 126.64 and 99.14 kJ/mol based on Flynn-Wall-Ozawa method and 122.16 and 94.73 kJ/mol based on Kissinger-Akahira-Sunose and no ash, respectively. V C 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42336.

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Section: Charge Density and Hydrodynamic Diameter Characterizationmentioning

confidence: 99%

Characterization of four different lignins as a first step toward the identification of suitable end‐use applications

Oveissi

Fatehi

2015

J of Applied Polymer Sci

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“…Figure shows that the adsorptive amount of retarder gradually increased as its dosage increased. Since the cement grains could only provide finite adsorption sites, the anionic polymer would form a compact adsorption layer on the surface of cement while reaching the saturated adsorption point. , For the cementing tail slurry, the retarder of low dosage was far away from its equilibrium adsorption point; thereby, it could not form a dense and effective adsorption layer on the surface of cement grains to inhibit the premature hydration of cement minerals. In this case, the cement hydrated in advance and generated CH and C–S–H gel.…”

Section: Resultsmentioning

confidence: 99%

Occurrence Mechanism of the Abnormal Gelation Phenomenon of High Temperature Cementing Slurry Induced by a Polycarboxylic Retarder

Xia,

Zhang,

et al. 2024

ACS Omega

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The class G oil well cement is a type of special cement that can be subjected to a high temperature formation environment. It was found that the class G cement tail slurry with a low polycarboxylic retarder dosage (usually ≤1% by weight of cement) was more prone to cause the abnormal gelation phenomenon (AGP) than the lead slurry with a high retarder dosage at a high temperature (usually when T ≥ 120 °C). This study aimed at the occurrence mechanism of this unfavorable phenomenon that seriously endangers the cementing security. Results showed that the abnormal gelatinous region underwent premature hydration; namely, the calcium hydroxide and calcium silicate hydrate (C−S−H) content were all higher than the nongelatinous region, while the copolymer content was the opposite. Correspondingly, the theory of "premature hydration and crystal nucleation" was proposed to explain the abnormal gelation mechanism of a cementing tail slurry with an insufficient retarder dosage. Furthermore, a novel functionalized copolymer retarder "PAIANS" was synthesized to alleviate the AGP.

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“…The concentration of Si‐OH groups on the surface of NS is about 5.0/nm 2 . Some of the surface Si‐OH groups would convert to Si‐O – due to their deprotonation under the alkaline condition, resulting in negative charges on the surface of NS particle . These negatively charged NS particles can provide anchoring action for the PDDA with positive charges.…”

Section: Resultsmentioning

confidence: 99%

“…[22,23] Some of the surface Si-OH groups would convert to Si-Odue to their deprotonation under the alkaline condition, resulting in negative charges on the surface of NS particle. [17,24] These negatively charged NS particles can provide anchoring action for the PDDA with positive charges. Therefore, PDDA can be introduced onto the surface of NS particle via the ion pair.…”

Section: Resultsmentioning

confidence: 99%

Potential Effect of Surface Modified Nano‐SiO₂ with PDDA on the Cement Paste Early Hydration

et al. 2020

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The potential application of surface modified nano‐SiO2 (NS) particles with poly (dimethyl diallyl ammonium chloride) (PDDA) has been reported in other fields, but not in civil construction. This paper aims to assess the influence of surface modified NS with PDDA on the early‐age hydration of cement paste, where cement is replaced by 0.3%, 1% and 3% of NS particle. PDDA can be introduced onto the surface of NS via long‐distance charge pairs. Calorimetric measurements of cement pastes with 0.35 w/b (water/binder) ratio show that NS particles accelerate the cement hydration, while PDDA retards it. Moreover, the cement hydration is controlled by PDDA at lower dosage of NS/PDDA particle, which delays the exothermic peaks of cement hydration, while the cement hydration is controlled by NS particle aggregates at higher dosage of NS/PDDA particle. Based on the results above, the mechanism of the adsorption of NS/PDDA particle on cement particle surfaces is proposed.

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Determination of the adsorbed layer thickness of functional anionic polymers utilizing chemically modified polystyrene nanoparticles

Cited by 30 publications

References 20 publications

Characterization of four different lignins as a first step toward the identification of suitable end‐use applications

Characterization of four different lignins as a first step toward the identification of suitable end‐use applications

Occurrence Mechanism of the Abnormal Gelation Phenomenon of High Temperature Cementing Slurry Induced by a Polycarboxylic Retarder

Potential Effect of Surface Modified Nano‐SiO₂ with PDDA on the Cement Paste Early Hydration

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Determination of the adsorbed layer thickness of functional anionic polymers utilizing chemically modified polystyrene nanoparticles

Cited by 30 publications

References 20 publications

Characterization of four different lignins as a first step toward the identification of suitable end‐use applications

Characterization of four different lignins as a first step toward the identification of suitable end‐use applications

Occurrence Mechanism of the Abnormal Gelation Phenomenon of High Temperature Cementing Slurry Induced by a Polycarboxylic Retarder

Potential Effect of Surface Modified Nano‐SiO2 with PDDA on the Cement Paste Early Hydration

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Potential Effect of Surface Modified Nano‐SiO₂ with PDDA on the Cement Paste Early Hydration