spin-coating-india-hydrogel-films

Spin Coating Hydrogel Films

Thin hydrogel films have attracted great attention due to their promising applications in molecular separation, medical dressings, flexible electronics, etc. The tough physical hydrogel films by spin coating of a P (acrylic acid-co-acrylamide) or P (AAc-co-NIPAm) polymer solution and a subsequent gelation process, in which robust carboxyl–Fe3+ coordination complexes
were formed.

 

best-spin-coating-india-hydrogel-films
(a) Schematic for the profile of the disc hydrogel film. (b) Thickness profile of the P(AAc-co-AAm) hydrogel film fabricated with different spin times

 

By controlling the spin time, spin speed, and concentration of the polymer solution, the thickness of the films could be well tuned, ranging from several to hundreds of micrometers. The hydrogel films showed excellent mechanical properties, with tensile breaking strengths, breaking strains, Young’s moduli and tearing fracture energies. The obtained gel films showed a fast response (<60 s) and a large output force (~0.2 MPa) triggered by a concentrated saline solution, making them an ideal material in the design of chemomechanical device.

spin-coating-india-hydrogel-films
Image Credits: RSC Publishing

 

Reference: DOI: 10.1039/c8sm01126e

spin-coating-india-go-membrane

Spin Coating For Fabrication Of (r) GO-Assisted Membranes

Spin coating method is a widely used method for the fabrication of (r) GO-assisted membranes. Commonly, the first step of spin coating is dropping GO suspension on a base. The second step is rotating the plate with high speed. Consequently, there will be a formation of thin liquid layer which is driven by a centrifugal force. The properties of different GO membranes prepared by three methods, spin-coating, drop-coating and solvent-induced precipitation. They used glass and quartz as substrate to fabricate GO films. As a result, the GO films fabricated by spin coating were the thinnest among all products.

Spin coating method can easily adjust the thickness and area of membranes by controlling the amount of (r) GO solution and the size of the substrate. The produced r-GO thin film have been used in the application of photodetection.

Reference: Royal Society of Chemistry

spin-coating-machines-for-flexible-electronics

Epitaxial Films Through Spin Coating – Used In

Spin coating machine can be used to deposit epitaxial films of inorganic materials such as zinc oxide (ZnO), lead (II) iodide (PbI 2), sodium chloride (NaCl) and cesium lead bromide (CsPbBr 3) onto a variety of single-crystal and single-crystal–like substrates. The spin coating process can use either solutions of the material or precursors to the material.

 

Epitaxial films using spin coating machine for flexible electronics, displays, and solar cells

 

spin coating machines for flexible electronics, displays, and solar cells
Epitaxial Spin Coating Schematic

 

The spin coating of epitaxial films offers an inexpensive and readily accessible route to single crystal like materials that should exhibit superior electronic and optical properties owing to the absence of high-angle grain boundaries.The films were deposited from solutions of the material or of the material that readily converted to the final product with only volatile side products. The precursor route used for depositing ZnO from an ammine complex should be applicable to other metal oxides.

Spin coating also offers two avenues to highly ordered semiconductors for flexible electronics, displays, and solar cells. The materials can be spin coated onto flexible single crystal like metal foils or they can be deposited by more conventional vapor deposition techniques onto spin-coated water soluble salts such as NaCl that serve as sacrificial templates for epitaxial lift off of free-standing semiconductor foils.

Reference: DOI: 10.1126/science.aaw6184, Science Magazine Digital