Spreading of a non-Newtonian liquid over the surface of centrifugal atomizers

Uklistyi, A. E.; Tyabin, N. V.; Ryabchuk, G. V.; Lepekhin, G. I.

doi:10.1007/bf01154404

Cited by 3 publications

(7 citation statements)

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“…The process (Figure 1) is made by distinct stages: 1) The solution is dropped on the substrate that, at the beginning can be at rest or rotating. After deposition, the substrate is accelerated so through the centrifugal force, the solution can be dispersed on the substrate, radially throughout the edges 5,[24][25][26][27][28][29][30] . 2) The speed is kept stable, with the balance between the centrifugal forces and the viscosity forces to create a homogeneous film.…”

Section: Spin Coating Processmentioning

confidence: 99%

“…2) The speed is kept stable, with the balance between the centrifugal forces and the viscosity forces to create a homogeneous film. 3) The substrate is kept at constant speed to evaporate the remaining solvent 5,[24][25][26][27][28][29][30] . Besides keeping a balance between the acting forces, the constant speed helps the evaporation rates, an important parameter to obtain a homogeneous film 5 .…”

Section: Spin Coating Processmentioning

confidence: 99%

“…The parameters previously mentioned are used for modelling the spin coating process, which relates analytical models with sophisticated mathematical expressions Equations 1 to 9 24,[26][27][28][29] (1) Ƞ = absolute viscosity; ρ = fluid density; v = speed in the radial direction (r); ω = Angular rotation speed.…”

Section: Spin Coating Processmentioning

confidence: 99%

“…Another important observation is that, for long periods of time, high quantities of solution deposited on the substrate do not affect the final film thickness. Additionally, h is proportional to the inverse of the square root of time Equation 9and there is reduction of the thickness with increasing the angular speed 24,[26][27][28][29] substrates. And, through Equation 9 the thickness is found to be related with the angular speed (ω) by a factor of / 1 t 29 .…”

Section: Spin Coating Processmentioning

confidence: 99%

“…The rotation is a parameter that affects the thickness and homogeneity of the film 5,24,[26][27][28][29] . The engine must provide sufficient torque to rotate the substrate along with the dropped solution for a successful deposition.…”

Section: Technical Specificationsmentioning

confidence: 99%

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Building and Testing a Spin Coater for the Deposition of Thin Films on DSSCs

et al. 2020

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A low cost spin coater was constructed in this work for the deposition of thin films of titanium dioxide (TiO 2 ) on conductive substrate of FTO (fluoride doped tin oxide) with application on dye sensitized solar cells. The results showed a 95% precision between the speed values obtained by the software of C#sharp language and the spin values observed directly on the device. The TiO 2 films deposited through the spin coater with different angular speeds were characterized by UV-Vis optical spectrum, scanning electron microscopy (SEM), atomic force microscopy (AFM) and electrical measurements on an active area of 0.25 cm 2 . The DSSCs assembled with the TiO 2 films of double layer deposited by the spin coater had an efficiency value of 12.74%, while the cell with a single layer presented 4.05% efficiency. Therefore, it is concluded that the spin coater assembled in this study at low costs successfully can produce TiO 2 electrodes for DSSCs.

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Section: Spin Coating Processmentioning

confidence: 99%

Section: Spin Coating Processmentioning

confidence: 99%

Section: Spin Coating Processmentioning

confidence: 99%

Section: Spin Coating Processmentioning

confidence: 99%

Section: Technical Specificationsmentioning

confidence: 99%

See 3 more Smart Citations

Building and Testing a Spin Coater for the Deposition of Thin Films on DSSCs

et al. 2020

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Spin coating of non-Newtonian fluids

Lawrence

Zhou

1991

Journal of Non-Newtonian Fluid Mechanics

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The mechanics of spin coating of polymer films

Lawrence

1988

The Physics of Fluids

292

227

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The process of spin coating is described, with particular attention to applications in microelectronics. The physical mechanisms involved in the process are discussed and those mechanisms that affect the final state are identified, viz., centrifugal and viscous forces, solute diffusion, and solvent evaporation: A model is proposed that incorporates only the latter mechanisms, with viscosity and diffusivity depending on solute concentration. The evaporation of solvent during spinning causes the solution viscosity to increase and the flow is reduced. The thickness of the final solid film is related to the thickness of a diffusion boundary layer near the free surface. The model predicts the final dry film thickness in terms of the primary process variables, spin speed, and initial polymer concentration. A similarity boundary-layer analysis leads to a simple approximate result for the final film thickness that is consistent with limited experimental data, hf ∼KC0(ν0D0)1/4/Ω1/2, where K is a number of order unity and the other quantities are, respectively, the initial polymer concentration, the kinematic viscosity, the solute diffusivity, and the spin speed. The dependence on diffusivity has not previously been described theoretically. The total spin time is shown to be proportional to Ω−1, in agreement with experiment. The rate of solvent evaporation is shown to be proportional to Ω, which contradicts previous assumptions.

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Spreading of a non-Newtonian liquid over the surface of centrifugal atomizers

Cited by 3 publications

References 0 publications

Building and Testing a Spin Coater for the Deposition of Thin Films on DSSCs

Building and Testing a Spin Coater for the Deposition of Thin Films on DSSCs

Spin coating of non-Newtonian fluids

The mechanics of spin coating of polymer films

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