The Effect of Particle Sizes on the Concentration Dependence of the Surface Tension of Aqueous Suspensions of Bentonite

Abstract:

The paper presents experimental results on the dependence of surface tension on the concentration of a suspension of bentonite (0 - 10% by weight). The isotherms σ of aqueous suspensions of bentonite are characterized by local minima in the concentration range of 3-4 mass% of the solid phase. It has been established that a decrease in the average particle size leads to the disappearance of the extremum on the surface tension isotherms. The data obtained led to the conclusion that the most important factors affecting the nature of the isotherms of the surface tension of bentonite suspensions are the degree of dispersion and the presence in the aqueous suspension of bentonite, both colloidal and coarse particles.

• Periodical: Materials Science Forum (Volume 1022)
• Pages: 212-217
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.1022.212
• Online since: February 2021
• Authors: R.Kh. Dadashev, R.S. Dzhambulatov*, Z.S. Khasbulatova, Kh.S. Talkhigova
• Keywords: Bentonite, Particle Sizes, Surface Tension, Tension Isotherms

References

[1] Vakalova V., Khabas T.A., Pogrebenkov V.M., Vereshchagin V.I., Clays structure, properties and research methods, Tomsk, (2005).

[2] Dadashev R., Thermodynamics of surface phenomena. Cambridge international science publishing, Cambridge, (2008).

[3] Dadashev R.H., Dzhambulatov R.S., Elimkhanov D.Z., Installation for the study of surface properties of the phase boundary (DSA-100), Bulletin of the Academy of Sciences of the Chechen Republic, 1, (2011), 13-17.

[4] Dadashev R.H., Dzhambulatov R.S., Elimkhanov D.Z., Measurement of surface tension by hanging drop method on a DSA-100 tensiometer. Works of the CSRI RAS, 5, (2012), 3–7.

[5] Dadashev R.Kh., Elimkhanov D.Z., Jambulatov R.S., Features of the concentration dependences of the surface tension of water suspensions of bentonites. Russian Journal of Physical Chemistry A., 89, (2015), 1504-1506.

DOI: 10.1134/s0036024415080075

[6] Petrov Yu.I., About surface tension and surface pressure in clusters and small particles. Izvestiya of the RAS, The series is physical, 62, (1998), 1142–1148.

[7] Shebzukhov M.A., Shebzukhov A.A., Phase equilibrium and surface characteristics in a binary system containing nanoscale particles. Solid State Physics. Institute of Physics and Technology A.F. Joffe RAS, 60, (2018), 390–395.

DOI: 10.1134/s1063783418020245

[8] Nanda C., Bulk C., Social energy and surface tension from the size-dependent evaporation study of nanoparticle. Applied Physics Letters. 87, (2005), 21–29.

DOI: 10.1063/1.1994958

[9] Samsonov V.M., Chernyshov A. A., On the size dependence of the surface energy of metal nanoclusters. Colloid journal, 78, (2016), 365–373.

[10] Zimon D., Pavlov A.N., Colloid chemistry of nanoparticles, Moscow, (2012).

[11] Information on www/horiba.com.