Dyes in the context of Dyed


Dyes in the context of Dyed

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⭐ Core Definition: Dyes

A dye is a colored substance that chemically bonds to the material to which it is being applied. This distinguishes dyes from pigments which do not chemically bind to the material they color. Dye is generally applied in an aqueous solution and may require a mordant to improve the fastness of the dye on the fiber.

The majority of natural dyes are derived from non-animal sources such as roots, berries, bark, leaves, wood, fungi and lichens. However, due to large-scale demand and technological improvements, most dyes used in the modern world are synthetically produced from substances such as petrochemicals. Some are extracted from insects and/or minerals.

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Dyes in the context of Dyeing

Dyeing is the application of dyes or pigments on textile materials such as fibers, yarns, and fabrics with the goal of achieving color with desired color fastness. Dyeing is normally done in a special solution containing dyes and particular chemical material. Dye molecules are fixed to the fiber by absorption, diffusion, or bonding with temperature and time being key controlling factors. The bond between the dye molecule and fiber may be strong or weak, depending on the dye used. Dyeing and printing are different applications; in printing, color is applied to a localized area with desired patterns. In dyeing, it is applied to the entire textile.

The primary source of dye, historically, has been nature, with the dyes being extracted from plants or animals. Since the mid-19th century, however, humans have produced artificial dyes to achieve a broader range of colors and to render the dyes more stable for washing and general use. Different classes of dyes are used for different types of fiber and at different stages of the textile production process, from loose fibers through yarn and cloth to complete garments.

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Dyes in the context of Textile printing

Textile printing is the process of applying color to fabric in definite patterns or designs. In properly printed fabrics the colour is bonded with the fibre, so as to resist washing and friction. Textile printing is related to dyeing but in dyeing properly the whole fabric is uniformly covered with one colour, whereas in printing one or more colours are applied to it in certain parts only, and in sharply defined patterns.

In printing, wooden blocks, stencils, engraved plates, rollers, or silkscreens can be used to place colours on the fabric. Colourants used in printing contain dyes thickened to prevent the colour from spreading by capillary attraction beyond the limits of a pattern or design.

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Dyes in the context of Kemalpaşa

Kemalpaşa is a municipality and district of İzmir Province, Turkey. Its area is 681 km, and its population is 114,250 (2022). Kemalpaşa town is 29 km (18 mi) from the historical and traditional center of İzmir, (Konak) and has high levels of development in terms of industry and services. İzmir-Ankara highway crosses the district area 8 km (5.0 mi) to the north of the district center. Kemalpaşa district borders the district Bornova to the west, Yunusemre, Şehzadeler and Turgutlu (Manisa Province) in the north and east, and İzmir's districts of Torbalı and Bayındır in the south. The eastern and southern parts of Kemalpaşa district preserve their markedly rural characteristics, which results in an urbanization rate of only 25.7 for the district area as a whole, despite the presence of a strong industrial base in and to the west of Kemalpaşa town. Kemalpaşa's very large organized industrial zone (KOSBİ) brings together producers of construction materials, rubber and plastic goods, textiles and clothing, leather, paper, packaging materials, machinery and other equipment, including electrical tools and installations, dyes and other chemical substances, marble and car parts, as well as foundries and other metalworks. Agriculture also occupies a portion with high added value in Kemalpaşa's economy, its cherries being of nationwide renown (known as Kemalpaşa kirazı in Turkish) and exported. Literacy is at a high level at 90%, and the neighboring Bornova, where Ege University is based, serves as a nearby pool in terms of trained personnel.

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Dyes in the context of Azobenzene

Azobenzene is a photoswitchable chemical compound composed of two phenyl rings linked by a N=N double bond. It is the simplest example of an aryl azo compound. The term "azobenzene" or simply "azo" is often used to refer to a wide class of similar compounds. These azo compounds are considered as derivatives of diazene (diimide), and are sometimes referred to as "diazenes". The diazenes absorb light strongly and are common dyes. Different classes of azo dyes exist, most notably the ones substituted with heteroaryl rings.

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Dyes in the context of Mycoremediation

Mycoremediation (from ancient Greek μύκης (mukēs), meaning "fungus", and the suffix -remedium, in Latin meaning 'restoring balance') is a form of bioremediation in which fungi-based remediation methods are used to decontaminate the environment. Fungi have been proven to be a cheap, effective and environmentally sound way for removing a wide array of contaminants from damaged environments or wastewater. These contaminants include heavy metals, organic pollutants, textile dyes, leather tanning chemicals and wastewater, petroleum fuels, polycyclic aromatic hydrocarbons, pharmaceuticals and personal care products, pesticides and herbicides in land, fresh water, and marine environments.

The byproducts of the remediation can be valuable materials themselves, such as enzymes (like laccase), edible or medicinal mushrooms, making the remediation process even more profitable. Some fungi are useful in the biodegradation of contaminants in extremely cold or radioactive environments where traditional remediation methods prove too costly or are unusable.

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Dyes in the context of Electrophoretic deposition

Electrophoretic deposition (EPD), is a term for a broad range of industrial processes which includes electrocoating, cathodic electrodeposition, anodic electrodeposition, and electrophoretic coating, or electrophoretic painting. A characteristic feature of this process is that colloidal particles suspended in a liquid medium migrate under the influence of an electric field (electrophoresis) and are deposited onto an electrode. All colloidal particles that can be used to form stable suspensions and that can carry a charge can be used in electrophoretic deposition. This includes materials such as polymers, pigments, dyes, ceramics and metals.

The process is useful for applying materials to any electrically conductive surface. The materials which are being deposited are the major determining factor in the actual processing conditions and equipment which may be used.

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