Dip-coating

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Dip-Coating Process
– Immersion of substrate in coating material
– Start-up of pulling up the substrate
– Deposition of thin layer on the substrate
– Drainage of excess liquid
– Evaporation of solvent to form the thin layer

Applications in Research
– Multilayer sensor coatings
– Implant functionalist
– Hydro gels
– Sol-Gel nano particle coatings
– Self-assembled mono layers

Nanoparticle Coatings
– Utilized in fabrication of bioceramic nanoparticles, biosensors, implants, and hybrid coatings
– Nonthermal coating method to immobilize hydroxyapatite and TiO nanoparticles on polymethyl methacrylate
– Deposition of porous cellulose nanocrystals and poly(vinyl alcohol) CNC/PVA nanocomposite films on glass substrates

Sol-Gel Technique
– Creating thin inorganic or polymeric coatings
– Deposition speed affects layer thickness, density, and porosity
– Widely used in material science for protective coatings, optical coatings, ceramic coatings, etc.
– Hydrolysis of liquid precursor followed by poly-condensation to obtain a gel
– Liquid phase reduced stepwise and remaining liquid removed by drying

Related Concepts
– Nanoparticle deposition
– Sol-gel
– Coatings Source:  https://en.wikipedia.org/wiki/Dip-coating

Dip-coating (Wikipedia)

Dip coating is an industrial coating process which is used, for example, to manufacture bulk products such as coated fabrics and condoms and specialised coatings for example in the biomedical field. Dip coating is also commonly used in academic research, where many chemical and nano material engineering research projects use the dip coating technique to create thin-film coatings.

A schematic of the continuous dip coating process.
  1. Roll of coarse cloth
  2. Cloth
  3. Bath
  4. Liquid material
  5. Rollers
  6. Oven
  7. Scrapers
  8. Excess liquid falls back
  9. A coating remains on the fabric cloth.

The earliest dip-coated products may have been candles. For flexible laminar substrates such as fabrics, dip coating may be performed as a continuous roll-to-roll process. For coating a 3D object, it may simply be inserted and removed from the bath of coating. For condom-making, a former is dipped into the coating. For some products, such as early methods of making candles, the process is repeated many times, allowing a series of thin films to bulk up to a relatively thick final object.

The final product may incorporate the substrate and the coating, or the coating may be peeled off to form an object which consists solely of the dried or solidified coating, as in the case of a condom.

As a popular alternative to Spin coating, dip-coating methods are frequently employed to produce thin films from sol-gel precursors for research purposes, where it is generally used for applying films onto flat or cylindrical substrates.

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