Study on the Preparation of Nanocellulose Powder and Its Formation Mechanism

Nanocellulose is a kind of cellulose based nano material with fantastic properties and numerous potential applications. However, due to the fact that nanocellulose exhibits colloidal properties when its concentration is high, the drying of nanocellulose has always been an urgent problem to be solved. To address this problem, the precipitation and drying mechanism of cellulose nanocrystal (CNC), one of the most common types of nanocellulose, was studied in this paper. The CNC was precipitated from the aqueous suspension by salting out to avoid the CNC colloidal state when concentrated in water. The obtained CNC precipitation with a small amount of water and the actively added electrolyte was dehydrated and purified by solvent displacement with volatile organic. Then CNC powder can be taken shape by drying the mixture of CNC and organic solvent with different drying methods. The mechanism of CNC precipitation from aqueous suspension and CNC powder formation from volatile organic solvent was studied. After comprehensive consideration, a method for preparing re-dispersible CNC powder was established, and the properties of this powder were studied, that provided a solution for the industrial preparation and application of nanocellulose.

Biological synthesis of Nanoparticles from Medicinal Plants: Recent Studies

In a recent trend, nanotechnology has been developed to be an important field of research in various fields like medicinal chemistry, pharmaceuticals and all. On the other hand, compared to chemical method of synthesis, method of synthesis of nanoparticles by green method is simple, effective & ecofriendly. Plant extracts are obtained from the plant, creep, cereals, etc. generally natural extracts are prepared by decoction method or solid powder formation method. The natural extracts are very much effective in the medicinal approach. The study of Nano sized particles towards natural extracts has given a novel way in the field of medicines. So from the nanomaterials of natural extracts, one can expect still good effective results. As we know that preparation of nanoparticles through green approach is one of the good selections in the view of betterment of ecology. Therefore by taking aqueous extracts of medicinal plants’ parts and metal ions, nanoparticles can be synthesized. The plant extract and metal ions are taken in a fixed ratio and keep at room temperature for the reduction. The Changes in the Color confirmed the formation of nanoparticles. Further, the synthesized nanoparticles were characterized by UV, EPMA, XRD and FTIR data.