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Synthesis of new defoamer agents and characterization of cementitious formulations.
Heliyon
June 2024
University of Naples Federico II, Department of Chemical Sciences, Complesso Universitario di Monte Sant'Angelo, 80126, Naples, Italy.
The production of cementitious formulations involves the addition of chemical additives essential for the optimization of many properties. Superplasticizers are considered additives of great interest but when mixed with concrete they lead to an undesirable increase of air content, with the consequent development of foam. This can adversely affect both mechanical properties and workability, therefore, the use of an antifoam agent is also necessary which should be able to prevent or destroy the foam.
View Article and Find Full Text PDFDefoaming and Toughening Effects of Highly Dispersed Graphene Oxide Modified by Amphoteric Polycarboxylate Superplasticizer on Oil Well Cement.
Materials (Basel)
May 2024
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China.
The aggregation of graphene oxide (GO) during the hydration process limits its wide application. Polymer superplasticizers have been used to improve the dispersion state of GO due to their adsorption and site-blocking effects, though the formation of a large amount of foam during the mixing process weakens the mechanical properties of cement. A highly dispersed amphoteric polycarboxylate superplasticizer-stabilized graphene oxide (APC/GO) toughening agent was prepared by electrostatic self-assembly.
View Article and Find Full Text PDFPreparation of hyperbranched hydrophobic nano-silica and its superior needling-effect in PDMS defoam agent.
J Colloid Interface Sci
September 2024
Engineering Research Center for Nanomaterials, Henan University, Kaifeng, 475004, China; Engineering Research Center for Nanomaterials Company Limited, Henan University, Jiyuan 459000, China.
Hydrophobic nano silica powder is a kind of important synergist to silicone defoaming agents. The large pore volume and branched chain conformation of silica nanoparticles present superior effects on defoaming properties. However, silica nanoparticles synthesized by liquid phase easily aggregate and pore collapse because of their high surface activity and polarity, leading to poorer dispersity and limited practicability.
View Article and Find Full Text PDFMicroscopic Understanding of Interfacial Performance and Antifoaming Mechanism of REP Type Block Polyether Nonionic Surfactants.
Molecules
April 2024
Key Lab. of Colloid and Interface Chemistry of State Education Ministry, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China.
In many practical applications involving surfactants, achieving defoaming without affecting interfacial activity is a challenge. In this study, the antifoaming performance of REP-type block polymer nonionic surfactant C12EOmPOn was determined, and molecular dynamics simulation method was employed to investigate the molecular behaviors of surfactants at a gas/water interface, the detailed arrangement information of the different structural segments of the surfactant molecules and the inter-/intra-interactions between all the structural motifs in the interfacial layer were analyzed systematically, by which the antifoaming mechanisms of the surfactants were revealed. The results show that the EO and PO groups of REP-type polyether molecules are located in the aqueous phase near the interface, and the hydrophobic tails distribute separately, lying almost flat on the gas/water interface.
View Article and Find Full Text PDFRecent Advances in Catalytic Systems for the Reduction of Aromatic and Aliphatic Nitrile Compounds to Amines.
Comb Chem High Throughput Screen
April 2024
Department of Chemistry, Rasht Branch, Islamic Azad University, Rasht, Iran.
Amines are important and valuable compounds widely used in the chemical industry to produce various products such as dyes, detergents, solvents, additives, pharmaceutical products, and anti-foam agents. A property that distinguishes primary amines from other compounds is their straightforward functionalization. Therefore, the synthesis of different amine compounds has been considered by many researchers in recent years.
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