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Solution dyeing, also known as dope or spun dyeing, is the process of adding pigments or insoluble dyes to the spinning solution before the solution is extruded through the spinneret. Only manufactured fibers can be solution dyed.
The dope dyeing applies to synthetic fiber only. This method of dyeing is also known as solution dyeing [10] and 'mass coloration' or 'mass colored'. It has limited color options. [11] [12] Fiber dyeing: In fiber dyeing, the dyeing takes place at the fiber stage before they are spun into yarn. It is also called stock dyeing. Examples are ...
Doping of a pure silicon array. Silicon based intrinsic semiconductor becomes extrinsic when impurities such as boron and antimony are introduced.. In semiconductor production, doping is the intentional introduction of impurities into an intrinsic (undoped) semiconductor for the purpose of modulating its electrical, optical and structural properties.
A dopant (also called a doping agent) is a small amount of a substance added to a material to alter its physical properties, such as electrical or optical properties. The amount of dopant is typically very low compared to the material being doped.
Further work by Hoffman [18] along with the discovery of benzene’s structure (1858) and carbon’s tetravalency(1865), this science built the groundwork for modern organic chemistry. [19] In the late 1860s many companies began offering a full spectrum of colors, and were already outcompeting many natural dyes for market share.
Dietitians explain what red dye number three is, if you should be worried about it, and what to do with the food that has it now that it has been banned. The Fascinating Backstory Behind Red Dye No. 3
A very rare heterogeneous process is the fiber acetate process, which is only used for the production of cellulose triacetate as an end product. In this process, the cellulose is suspended in a non-solvent (such as benzene) and esterified with acetic anhydride in the presence of perchloric acid as catalyst.
The like charges repel each other, and the addition of salt aids in dyeing by generating a positive charge on the cotton surface. [7] [8] The industry has predominantly used reactive dyes to color knitted cotton goods. The treatment of salt-laden, colored effluent generated by the dyeing process is one of the industry's primary concerns. Cotton ...