Pillar arrays

S. Chang and Y. H. Cho, A continuous size-dependent particle separator using a negative dielectrophoretic virtual pillar array. Lab on A Chip, vol. 8, pp. 1930-1936, 2008. 

The silica crystal array can also be used for pulsed fields by adding two additional reservoirs to the PDMS cover to create a 120° crossed field. The mobility of different size long DNA (48.5, 23.1, and 9.4 kbp) vary in the pulsed-field array, indicating that they could be separated in such an array if a suitable injection system were employed. The high electric fields and rapid pulse times employed in these experiments are comparable to pulsed-field electrophoresis in the DNA prism pillar array [37]. 

Fig. 2.6 Schematic illustrations of SmA LC confined by a SU-8 square pillar array where FCDs were grown either in between 4 neighboring pillars (a) and on top of pillars (b) and corresponding SEM and POM images [37]...

Separation and mixing of fluids are common operations in chemical and biological assays. When scaled down to microfluidics, these operations are usually achieved by micro pillar arrays. Figure 16 shows an electrochromatography pattern, formed by imprinting a COC... 

Figure 4. (a) SEM pictures of a series of perpendicular pillar arrays whose wetting behavior is going to be compared with that of the taper-shaped structures, (b) The series of taper-shaped structures formed by the backside exposure conditions. Both pictures show structures created with a UV mask with square structure of 30 om width and distances from 30 om to 120 jm. 

Further, if the colloidal monolayer is heated above its glass-transition temperature, the colloidal monolayer will be deformed. Based on the 2-D heat-deformed colloidal monolayers, we presented a simple approach to prepare large-sized hexagonal nano-pillar arrays by solution-dipping method [30]. In this method, first, the... 

Figure 8. (a) FESEM image of silica nano-pillar array. Inset shows the water droplet (the corresponding CA = 165°). (b) Probable three-phase contact line (dark line) on the nano-pillar array. 

Akabori, M. et al. (2003). In GaAs Nano-pillar Array Formation on Partially Masked... 

Figure 5. Ceramic pillar array imit prepared by soft molding.

Detobel, R, de Bruyne, S., Vangelooven, J., de Malsche, W., Aerts, T., Terryn, H., Gardeniers, H., Eeltink, S., and Desmet, G. 2010. Fabrication and chromatographic performance of porous-shell pillar-array columns. Anal. Chem., 82 7208-7217. 

Op de Beeck, Jeff, de Malsche, W., Tezcan, D.S., de Moor, P., and Desmet, G. 2012. Impact of the limitations of state-of-the-art micro-fabrication processes on the performance of pillar array columns for liquid chromatography, J. Chromatogr. A, 1239 35-48. 

Kirchner, T.B., Hatab, N.A., Lavrik, N.V., and Sepaniak, M.J. 2013. Highly ordered silicon pillar arrays as platforms for planar chromatography, Anal. Chem., 85 11802-11808. 

Xu CN, Miyazaka K, Watanabe T (1998) Humidity sensors using manganese oxides. Sens Actuators B 46 87-96 Xu YY, Li XJ, He JT, Hai XH, Wang Y (2005) Capacitive humidity sensing properties of hydrothermtilly-etched silicon nano-porous pillar array. Sens Actuators B 105 219-222... 

An interesting new mode of microchip columns are pillar array columns, made by... 

Figure 9.9 Wear tests on (a) polymer membranes in comparison to (b) pillar arrays Schematic representation of the experimental setup consisting of an oscillating steel ball, pressed onto the structured surfaces. Experimental data on maximum normal loads the surfaces can resist without destruction and SEM images after failure [55],...

Fig. 2. Electrochromatographic separation of peptides from a tryptic digest of ovalbumin on C,g-modified pillars (main picture), and part of a microfabricated pillar array showing the inlet region of the array (upper left). (Reprinted with permission from [11] and [26], copyright (1998) American Chemical Society and (1999) Elsevier).

The applicability of microfabricated pillar arrays (see Section 2.7.2.2.4) for the electrochromatographic separation of peptides from a tryptic digest of ovalbumin was demonstrated by He et al. [1 Ij. Their separation column was 4.5 cm long and... 

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