Importance of interfacial and rheological properties in the suppression of uniform deposition to coffee ring pattern of zinc oxide nanofluids in the presence of anionic surfactants

2020 ◽  
Vol 298 (6) ◽  
pp. 587-594 ◽  
Author(s):  
A. Akshai ◽  
Aisha Abdul Raouf ◽  
Rajib Ghosh Chaudhuri
Keyword(s):  
Zinc Oxide ◽  
Rheological Properties ◽  
Anionic Surfactants ◽  
Coffee Ring ◽  
Uniform Deposition

scholarly journals RESEARCH OF TECHNOLOGICAL PROPERTIES OF RUBBER MIXTURES BASED ON SYNTHETIC RUBBERS FILLED WITH CARBON-CONTAINING MATERIAL

2020 ◽  
Vol 2 (3(72)) ◽  
Author(s):  
Sh.T. Dzhuraev ◽  
B.F. Muhiddinov ◽  
A.S. Ibodullaev
Keyword(s):  
Zinc Oxide ◽  
Rheological Properties ◽  
Physicochemical Characteristics ◽  
Technological Properties ◽  
Natural Surface ◽  
Rubber Compounds ◽  
Elastomeric Materials ◽  
Automobile Tires

The paper presents the results of studies of the physicochemical characteristics of the carbon-containing material obtained as a result of the pyrolysis of worn automobile tires. Ankerite (1.21%), zinc oxide (1.14%) and other components. Composite elastomeric materials based on rubbers SKI-3 and Nairit KR-50, filled with carboncontaining material, have been developed. Interconnections between structural radiations and the natural surface of a carbon-containing material and rubber macromolecules were found. The technological and rheological properties of the floor-elastomeric compositions with a carbon-containing effect were studied, and their optimal content in rubber compounds was shown.

scholarly journals Physical and rheological properties of nano zinc oxide modified asphalt binder

2018 ◽  
Vol 250 ◽  
pp. 02004
Author(s):  
Khairul Nizam Mohd Yunus ◽  
Mohd Ezree Abdullah ◽  
Mohd Khairul Ahmad ◽  
Nurul Hidayah Mohd Kamaruddin ◽  
Haniffah Tami
Keyword(s):  
Zinc Oxide ◽  
Rheological Properties ◽  
Softening Point ◽  
Permanent Deformation ◽  
Asphalt Binder ◽  
Zinc Nitrate ◽  
Rutting Resistance ◽  
Nano Zinc Oxide ◽  
Modified Binder ◽  
Nano Zinc

The main objectives of this work were to investigate the physical and rheological properties of nano zinc oxide (NaZO) flake structure as a modifier in asphalt binder. NaZO was produced with hydrothermal method by using two precursors, which are zinc nitrate and sodium hydroxide. NaZO was mixed with virgin binder 60/70 penetration grade at 3%, 5% and 7% of asphalt binder weight, respectively. The physical properties were evaluated by conventional testing, such as penetration, softening point and viscosity. Meanwhile, the rheological property, such as rutting resistance, was measured by using a dynamic shear rheometer (DSR) for unaged and rolling thin film oven (RTFO) aged. It was observed that the penetration value was decreased and the softening point increased with increasing NaZO concentrations. In addition, the rutting resistance factor was increased for the modified binder. A comparison between the modified binder, 7% NaZO, showed a greater resistance to rutting before and after aging. Results of this study showed that the NaZO addition had increased the asphalt binder stiffness ; thus, could contribute to better resistance to permanent deformation.

scholarly journals Pattern Formation upon Evaporation of Sessile Droplets of Polyelectrolyte/Surfactant Mixtures on Silicon Wafers

2021 ◽  
Vol 22 (15) ◽  
pp. 7953
Author(s):  
Lionel Perrin ◽  
Andrew Akanno ◽  
Eduardo Guzman ◽  
Francisco Ortega ◽  
Ramon G. Rubio
Keyword(s):  
Surface Tension ◽  
Surfactant Concentration ◽  
Chemical Nature ◽  
Anionic Surfactants ◽  
Phase Contact ◽  
Surfactant Mixtures ◽  
Diallyldimethylammonium Chloride ◽  
Coffee Ring ◽  
Three Phase ◽  
Surface Active

The formation of coffee-ring deposits upon evaporation of sessile droplets containing mixtures of poly(diallyldimethylammonium chloride) (PDADMAC) and two different anionic surfactants were studied. This process is driven by the Marangoni stresses resulting from the formation of surface-active polyelectrolyte–surfactant complexes in solution and the salt arising from the release of counterions. The morphologies of the deposits appear to be dependent on the surfactant concentration, independent of their chemical nature, and consist of a peripheral coffee ring composed of PDADMAC and PDADMAC–surfactant complexes, and a secondary region of dendrite-like structures of pure NaCl at the interior of the residue formed at the end of the evaporation. This is compatible with a hydrodynamic flow associated with the Marangoni stress from the apex of the drop to the three-phase contact line for those cases in which the concentration of the complexes dominates the surface tension, whereas it is reversed when most of the PDADMAC and the complexes have been deposited at the rim and the bulk contains mainly salt.

scholarly journals Structural-rheological properties of systems based on polymeric hydrogels and anionic surfactants

2020 ◽  
Vol 64 (5) ◽  
pp. 551-557
Author(s):  
S. V. Bucha ◽  
Yu. V. Lipai ◽  
P. D. Vorobiev ◽  
D. V. Cherednichenko ◽  
A. D. Vorobiov ◽  
...  
Keyword(s):  
Sodium Dodecyl Sulfate ◽  
Rheological Properties ◽  
Sodium Oleate ◽  
Polyacrylic Acid ◽  
Anionic Surfactants ◽  
Sodium Dodecyl ◽  
Dodecyl Sulfate ◽  
Polymeric Hydrogels ◽  
The Individual ◽  
Increasing Temperature

The effect of sodium dodecyl sulfate and sodium oleate on the structural-rheological properties of a dispersed hydrogel based on polyacrylic acid was studied. It was shown that the viscosity of hydrogel compositions with surfactants is higher than the viscosity of the individual components and increases with increasing temperature from 20 to 40 °C. Compositions with sodium oleate are non-Newton liquids and exhibit thixotropic properties.

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