Cellulose microcrystals

About

Microcrystalline cellulose (MCC) is pure partially depolymerized cellulose synthesized from α-cellulose precursor. The MCC can be synthesized by different processes such as reactive extrusion, enzyme mediated, steam explosion and acid hydrolysis. The later process can be done using mineral acids such as H2SO4, HCl and HBr as well as ionic liquids. The role of these reagents is to destroy the amorphous regions remaining the crystalline domains. The degree of polymerization is typically less than 400. The MCC particles with size lower than 5µm must not be more than 10%. The MCC is a valuable additive in pharmaceutical, food, cosmetic and other industries. Different properties of MCC are measured to qualify its suitability to such utilization, namely particle size, density, compressibility index, angle of repose, powder porosity, hydration swelling capacity, moisture sorption capacity, moisture content, crystallinity index, crystallite size and mechanical properties such as hardness and tensile strength. Thermogravimetric analysis (TGA) and differential thermal analysis (DTA) or differential scanning calorimetry (DSC) are also important to predict the thermal behavior of the MCC upon heat stresses.

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Cellulose nanocrystals

About

Nanocrystalline cellulose (NCC) is a uniform, re-dispersible natural nanoparticle obtained from the crystalline regions of cellulose fibers after dissolving amorphous regions of cellulosic microfibris found within plant cell walls.

Production methods

Cellulose is milled, and then hydrolyzed to remove amorphous regions. The resulting NCC is then separated and concentrated before being customized for various uses.

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Liquid Crystal Display

About

About Liquid Crystal Display.

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LCD

About

About LCD.

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