Hydrophobicity of the Modified Cerium Oxide Nanoparticles

Water repellent materials have many good properties, such as self-cleaning, anti-icing, anti-bacterial, drag reduction, and good thermal transfer, so hydrophobic surfaces have gotten a lot of attention. surface-free energy and surface roughness are two important factors for preparation of hydrophobic surfaces. these two parameters can be obtained concurrently by utilizing modified particles that lack a hydrophilic functional group. the glass surface was first coated with a dispersion of cerium oxide (ceo2) and acetone. the resultant ceo2 film has a static water contact angle (swca) of about 36±7◦, being consistent with that reported elsewhere[1]. cerium oxide has received a great deal of attention due to its appealing properties such as high thermal stability, high wear resistance, and high chemical stability. cerium oxide particles can induce surface roughness, but they can cause surface hydrophilicity due to the presence of surface hydroxyl groups[2]. these particles were modified with stearic acid(sa) to induce hydrophobicity followed by coating on a glass substrate. the amount of stearic acid used in the modification of nanoparticles affects the hydrophobicity of the particles. the resultant ceo2-0.1sa layer with a swca of about 95±7◦, was produced. this sample, which had the highest contact angle among the modified samples, was used in 1-2wt% composite in epoxy silicone(es). in 2%treated ceo2-es sample, the swca was 89±2◦. increasing in contact angle(about 5 degrees) is due to the presence of modified particles on the coating surface.

Hydrophobicity of the Modified Cerium Oxide Nanoparticles

Water repellent materials have many good properties, such as self-cleaning, anti-icing, anti-bacterial, drag reduction, and good thermal transfer, so hydrophobic surfaces have gotten a lot of attention. Surface-free energy and surface roughness are two important factors for preparation of hydrophobic surfaces. These two parameters can be obtained concurrently by utilizing modified particles that lack a hydrophilic functional group. The glass surface was first coated with a dispersion of Cerium oxide (CeO2) and acetone. The resultant CeO2 film has a static water contact angle (SWCA) of about 36±7◦, being consistent with that reported elsewhere[1]. Cerium oxide has received a great deal of attention due to its appealing properties such as high thermal stability, high wear resistance, and high chemical stability. Cerium oxide particles can induce surface roughness, but they can cause surface hydrophilicity due to the presence of surface hydroxyl groups[2]. These particles were modified with stearic acid(SA) to induce hydrophobicity followed by coating on a glass substrate. The amount of stearic acid used in the modification of nanoparticles affects the hydrophobicity of the particles. The resultant CeO2-0.1SA layer with a SWCA of about 95±7◦, was produced. This sample, which had the highest contact angle among the modified samples, was used in 1-2wt% composite in epoxy silicone(ES). In 2%treated CeO2-ES sample, the SWCA was 89±2◦. Increasing in contact angle(About 5 degrees) is due to the presence of modified particles on the coating surface.