Room-temperature imprinting

Xu, J., Locascio, L., Gaitan, M., Lee, C.S., Room-temperature imprinting method for plastic microchannel fabrication. Anal. Chem. 2000, 72(8), 1930-1933. 

M. Colburn et al.. Patterning nonflat substrates with a low pressure, room temperature, imprint lithography process, J. Vac. Sci. TechnoL, B, 19, 2162, 2001. 

Sanchez-Barragan, I., J.M. Costa-Femandez, R. Pereiro, et al. 2005. Molecularly imprinted polymers based on iodinated monomers for selective room-temperature phosphorescence optosensing of fluoranthene in water. Anal. Chem. 77 7005-7011. 

Fig. 5.9. Room temperature kinetics of the adsorption of 9EA (2 mL of a 0.1 mM solution in chloroform) to a MIP imprinted with 9EA (P9EA, 50 mg) and one with BA (PBA).

Metal ion-imprinted microspheres were prepared as follows [14,15]. Seed emulsion was obtained by the polymerisation of styrene, butyl acrylate and methacrylic acid in water. Divinylbenzene, butyl acrylate and water were further added to the polymerisation mixture (seed emulsion) and the emulsion was left for a defined time so that the seed microspheres became swollen. The emulsion was combined with a metal ion solution to achieve complexation between the metal ion and the carboxyl group on the surface. Then the divinylbenzene-containing emulsion was polymerised by the use of y-rays at room temperature. The micro-spheres obtained by centrifugation were washed with a hydrochloric acid solution to remove the metal ion. The microspheres obtained were then dried under vacuum. Non-imprinted microspheres (as a reference) were synthesised similarly, but without a metal ion. 

Fig. 21.3. Schematic figure of iton-covalent imprinting of polyurethane with an organic solvent as template and porogen. Highly robust MIPs are best prepared over night at room temperature. Template removal is achieved by evaporation or dissolution. Due to the ultra-thin layers the print molecules are often removed completely.

Imprinting into plastic materials can help to overcome two main disadvantages of silicon-based microfluidic systems expense of fabrication and brittleness of the material. Imprinting can be carried out at elevated temperatures [6,7] or at room temperature [8]. While heating of the plastic material can result in better feature aspect ratios, it is limited by the breaking of silicon templates during the cooling process due to the different thermal... 

Another important criterion for a good NIL resist is that the imprinted pattern should maintain its mechanical integrity during mold-substrate separation as well any subsequent pattern transfer steps. Although low Tg material can be used for NIL for the sake of reducing processing temperature, the imprinted patterns are also unstable and tend to deform at temperatures close to the imprinting temperature. In Fig. 4C, the pattern relaxation at room temperature is shown, which was... 

The principle objective of the present work was to mold potential baroplasties with pressure at room temperature into well-defined shapes. As shown in Figure 4 and 5 a mold for imprinting ITU and an extmding mold to obtain rectangular shaped strip film of the obtained polymers, respectively, can be used successfully demonstrating the room temperature processability by pressure. The mechanical properties of the latter, if needed, can potentially be measured using this film with a dynamic mechanical analyzer (DMA). 

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