Table of Contents
What is nano silica used for?
Use of nano-materials, particularly nano-silica as supplementary cementitious material, in manufacturing of paste, mortar, and concrete offer the potential of producing materials with new and interesting properties, such as enhanced strength and durability properties.
What is nano silica made of?
2 Properties of nano-SiO. Nano-SiO2 is a white fluffy powder composed of high purity amorphous silica powder. Because of its small particle size, nano-SiO2 had the advantages of large specific surface area, strong surface adsorption, large surface energy, high chemical purity and good dispersion.
How do you make nano silica?
Spherical and amorphous silica nanoparticles can be prepared by the hydrolysis reaction of TEOS in ethanol using water and ammonia using sol-gel method. The particle size of nano silica can be controlled by adding span 20, span 40 and span 60 surfactants.
What is the role of SiO2 in cement?
2. Silica (SiO2) Sufficient quantity of silica helps for the formation of di-calcium and tri-calcium silicates which imparts strength to the cement. Excess silica in cement will increase the strength of cement but at the same time setting time of cement also increased.
What kind of reactions a nanoparticle can trigger when they enter our skin?
Once NPs infiltrate the skin, they can exhibit various toxic effects, such as oxidative stress, cell apoptosis, mitochondrial dysfunction, and cytomembrane and DNA damage.
How do you extract silica from rice straw?
We successfully synthesized silica particles from rice straw waste using simple extraction method. The experiment was conducted by heating and extracting rice straw waste into basic solution. To get silica particles, the extracted solution was then put into acid solution and heated to remove the remained solvent.
How do you make nano-silica?
Nanosilica is synthesized by sol-gel method with 5 main steps: Washing and dry: Rice husk was washed thoroughly with water to remove the soluble particles, dust, and other contaminants present, whereby the heavy impurities such as sand are also removed. It was then dried in an air oven at about 110°C for 24 hours.