Spin casting

Spin casting

Polymer Microsystems: Materials and Fabrication

Published in Mohamed Gad-el-Hak, MEMS, 2005

Reaction with moisture or oxygen for some polymers, such as aromatic polyimides, can make spin casting less user-friendly. Better results can be obtained by spinning and curing the polymer films under a nitrogen ambient [Atkinson, 2003]. Once the films have been cured (even only partially), they are rendered structurally stable and can tolerate further processing in air.

Direct observation of oil-surface adhesion via sum frequency generation spectroscopy

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Journal Information

Published in The Journal of Adhesion, 2023

Kouki Akaike, Haruhisa Akiyama

Accompanying the preferential orientation of the Si-CH3 groups, the SFG from the surface hydroxyl group of the AlOx substrate was shifted toward a lower wavenumber by 10 cm–1 [Figure 3(b)]. Using the Badger-Bauer equation and its coefficients for sapphire,[33] the adsorption energy was calculated to be 0.14 kJ/mol, which is comparable to the energy for the polyisobutylene/sapphire interface, where the dispersion force is expected to be the main component of the interfacial interaction.[33] Noteworthy, the SFG spectra showed tailing from 3300 to 3600 cm–1. Kelvin probe measurements showed that spin-casting the silicone oil onto an Al sheet reduced the surface potential by 91.3 mV; thus, a dipole layer of DMSi molecules formed at the AlOx interface. The interaction between the dipole and surface O-H caused the large shift of the peak at 3700 cm–1 toward lower wavenumbers. The various molecular conformations of DMSi produced the wide distribution of the surface OH signal, from which it was difficult to estimate the adsorption enthalpy.

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Polymer Microsystems: Materials and Fabrication

Direct observation of oil-surface adhesion via sum frequency generation spectroscopy