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Showing 1 to 20 of 61 for “"dispersant"”.
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Crystallization and Separation of Pentaerythritol from Lubricating Oil Dispersant Additives
In the industrial production of a lubricating oil dispersant additive pentaerythritol (PE) is reacted with polyisobutenyl succinic anhydride (PIBSA). The sediment obtained is difficult to separate due to many factors also there is usually an increase in the sediment level during the storage of the …
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Non-Aqueous Dispersion Polymerization for Automotive Coating Applications
… sterically stabilized by low molecular weight dispersant polymer chains anchored to the particle surface either by chemical or physical interaction. The work presented in this thesis investigates three aspects influencing particle formation in the NAD system, i.e., the dispersant type, the …
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ΕΞΕΥΓΕΝΙΣΜΟΣ ΤΩΝ ΚΑΟΛΙΝΩΝ ΤΗΣ ΝΗΣΟΥ ΜΗΛΟΥ
… NALCO 600 (CATIONIC), CMC (ANIONIC). C)THE DISPERSANT (NAPO3)6. FOR THE DETERMINATION OF THE OPTIMUM CONDITIONS FOR THE SELECTIVE FLOCCULATION THE FOLLOWING FACTORS WERE STUDIED AS A FUNCTION OF PH: 1) THE CHANGE OF SUSPENSION STABILITY, WITHOUT DISPERSANT ADDITION. 2) THE EFFECT OF …
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Freeze Casting of Aqueous PAA-Stabilized Carbon Nanotube-Al2O3 Suspensions
… suspension of a 38 nm Al2O3 powder. The dispersant, dispersant amount, pH and solids loading were examined to determine the best conditions for freeze casting. Based on adsorption and viscosity data, optimal conditions for freeze casting were found with Poly(acrylic acid) (PAA) …
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The Effect of Spill Contaminants on Marine Biofilms and Microbially-Induced Corrosion of Carbon Steel
… artificial reefs. Spilled crude oil and chemical dispersant from the Deepwater Horizon (DWH) spill may have impacted the preservation of deep-sea historic shipwrecks and their microbiomes if they are located in areas where oil and dispersant were deposited on the seafloor. Oil potentially …
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Phase Behavior and Rheology of Latex, Thickener, Surfactant Mixtures and Liquid Crystal Based Compositions for Printing High-Efficiency Flexible Electronics
… between a non-ionic, block copolymer type dispersant and hydrophobically-modified, ethoxylated urethane (HEUR) associative thickeners in water. The dispersant was mixed at various concentrations (0-2% by weight) with HEUR thickeners at 1% by weight concentration in the aqueous medium. This …
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Investigating the redispersibility of calcium carbonate
… slurry product, Carbilux, after drying. Various dispersants and pH changes were made to improve the colloidal stability. The commercial product contained an unknown organic dispersant which was removed by washing and zeta potential results were measured. The rheological properties of the various …
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The feasibility of using electrostatic charge condition monitoring for lubricant additive screening
… was worn away. When friction modifier (FM) and dispersant additives were combined to lubricate a simulated wet clutch contact, x-ray photo-electron spectroscopy (XPS) analysis and friction data indicated that the dispersant dominated the tribofilm composition; evidenced by nitrogen levels and …
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The effect of polysaccharides and inorganic dispersants on the surface characteristics of talc and the effect on the flotation performance of a Merensky ore
… effect of polysaccharides and an inorganic dispersant on the surface characteristics of talc and how this relates to the flotation performance of Merensky ore. The rationale in investigating the talc changes are due to its naturally flotable nature and the downstream problems that result …
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STUDYING THE EFFECTS OF NEW ADDITIVE MATERIALS FOR THE IMPROVEMENT OF THE CAPACITY AND CYCLE LIFE PERFORMANCE OF THE LEAD-ACID BATTERY
… positive active mass (PAM) utilization, and dispersant additives to help the industrial pasting process.</p> <p>The thermodynamics and chemical reactions of a commercial electrolyte replacement called Tydrolyte<sup>TM</sup> were investigated using a model smooth lead system and compared to …
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Evaluation of Mechanical Properties of Provisional Fixed Partial Denture PMMA Material Containing Alumina Nanofibers
… (Jet Tooth Shade). A quaternary ammonium acetate dispersant (CC-59, Goldschmidt, Janesville, WI) was added to the acrylic monomer at 0.0 wt %, 1.0 wt %, 2.0 wt % and 5.0 wt % of the nanofiber weight (12 test groups, 1 control). Samples from each group were evaluated for flexural strength, flexural …
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Adsorption/Desorption Process of Stimuli-Responsive Polymers on Simulated Natural Surfaces Using QCM-D & AFM Analysis
… focuses on the evaluation of a novel oil spill dispersant with anti-deposition capabilities. The dispersing agent is largely comprised of hydroxypropyl cellulose and lecithin, agriculturally derived chemicals commonly used in the food industry. Spilled or leaked oil is a continued threat to the …
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Non-thermal Recovery of Heavy oil and Oil Sands Using Nanoparticle
… in a core holder with nanofluid suspended in a dispersant fluid to see the incremental recovery that can be realized after an initial brine flood process and compared it to a baseline experiment using only dispersant fluid. We also conducted a series of static and dynamic tests to investigate …
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INVESTIGATION OF SUCCINIMIDE DISPERSANTS AND THEIR INTERACTIONS USING REDUCED TOTAL OIL VOLUME LUBRICANT DEGRADATION
… four similar in all respects apart from the dispersant; a tris-succinimide. a bissuceinimide and a mono-succinimide with the same molecular weight polyisobutylene (RIB) backbone, and a second bis-succinimide with a lower molecular weight PIB backbone. The fifth oil had the lower molecular …
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Composition Effects on Sheen and Spread Rate of an Interior Flat, One Coat Latex Paint Formulation
… hydroxyethylcellulose (HEC) molecular weight, dispersant chemistry, latex chemistry, TiO2 concentration, extender package, and rheology modifier type. The sheen value, relative light scattering, and spread rate were the main measurements conducted in order to judge formulation improvement.</p> …
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Chemistry Of Antiwear Films By X-ray Absorption Spectroscopy
… for primary ZDDP. The presence of detergents and dispersant reduce the amount of unreacted ZDDP on the rubbing surface. The addition of the detergent and dispersant may change the polymerization of phosphate in the antiwear films. The S signals are much weaker than P signals and sulphur is in the …
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Phytoplankton Response to South Louisiana Crude Oil Exposure: Determining Impacts at Individual, Community, Toxin Production, Enzymatic-Activity and Gene-Expression Levels
… What is the ecological impact of the oil, the dispersant, and the dispersed oil to the GoM ecosystem? Significant and varying research efforts have contributed answers to this question. However, to better understand the complete ecological consequences of the spill in the GoM, the impact of the …
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Microchemical systems for understanding of multiphase flows in upstream hydrocarbon and natural gas productions
… multiphase flows in the presence of model dispersants were studied for We < 1. Introducing dispersants at varying dimensionless volumetric injection rates, ranging from 0.001 to 0.01, transitions from stable slug flow to the bubbly regime. Dimensionless mass ratios of three model …
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Mechanochemical synthesis and evaluation of rubber-thermoplastic polymer blends
… (60/40) composition as a solid phase dispersant (SPD)in polypropylene-polyeth ylene (1:1) blends was investigated. The behaviour of the above system was compared with that of EPDM when used as SPD in the same blends; NR/ PP offers better tensile properties while EPDM contributes …
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Assessment of nanocomposites vs. amorphous solid dispersions for dissolution enhancement of bcs class ii drugs
… (2) elucidate the impact of various classes dispersants on drug release rate and mechanisms during the redispersion-dissolution of nanocomposites prepared via dying of the drug nanosuspensions, and (3) assess the dissolution enhancement imparted by drug nanocomposites vs. ASDs prepared via …
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