Microchannels Constructed on Rough Hydrophobic Surfaces

2009

Anal. Chem.

Channels in a microfluidic device were rapidly created using an office inkjet printer. The process was easy enough for common end users to carry it out by themselves. A water-xylene interface was formed by combining two parallel channels that were filled with water and xylene, respectively. Such an interface can be important in analytical and synthetic uses because various chemical processes, such as reaction, extraction, and separation, can be performed through the interface. The water-filled channel was 0.5-1.3 mm wide, and the xylene-filled one was 1.3 mm wide. Both channels were 0.09 mm deep and 20 mm long. The continuous flow of these fluids was successfully carried out using a syringe pump at a volume flow rate of 1 microL/min for 5 min.

Section: Methodsmentioning

confidence: 99%

Formation of a Water−Xylene Interface in a Microchannel without Sidewalls

2009

Anal. Chem.

“…For example, Grimes et al reported a unique process using a thermoplastic material called M. Watanabe (&) Faculty of Textile Science and Technology, Shinshu University, 3-15-1 Tokida, Ueda, Nagano 386-8567, Japan e-mail: mwatana@shinshu-u.ac.jp ''Shrinky-Dink'' (Grimes et al 2008). Processes using a laser printer (do Lago et al 2003) and an inkjet printer (Watanabe 2007(Watanabe , 2008(Watanabe , 2009a were also reported.…”

Section: Introductionmentioning

confidence: 93%

“…Although the above channels are pipes normally having a rectangular cross section, another type of channel called a ''surface-directed channel'' has also been reported (Oh 1999;Lam et al 2002;Zhao et al 2002;Bouaidat et al 2005;Lee et al 2006;West et al 2007;Watanabe 2006Watanabe , 2007Watanabe , 2008Suk and Cho 2007;Sridharamurthy and Jiang 2007;Swickrath et al 2008Swickrath et al , 2009Yang et al 2009;Watanabe 2009a, b). While this type of channel is neither a pipe nor a groove, it can confine aqueous fluids in a narrow hydrophilic region created on a hydrophobic surface.…”

Section: Introductionmentioning

confidence: 97%

Microfluidic devices easily created using an office inkjet printer

2009

Microfluid Nanofluid

Although various processes have been used for producing microfluidic devices, many of them are not so simple that ordinary end-users can produce the devices by themselves. However, in this study, microfluidic devices were easily produced using an office inkjet printer. As the components of the device, channels, manifolds, and mixers were created by printing their shapes on glass slides using the printer. A syringe pump could control the flow of fluid through the manifolds and mixers. In addition, resistivity of the device to acidic and basic solutions was tested.

“…6 Another candidate for rapid production can be the use of surface-directed channels. [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] These channels can confine water as a fluid along hydrophilic line patterns that are chemically created on a hydrophobic surface. Because these channels are apparently not grooves or pipes, they can be created without etching the substrate.…”

Section: Introductionmentioning

confidence: 99%

Surface-directed channels filled with organic solvents

2009

Lab Chip

Although channels of microfluidic devices are normally pipes, some groups have recently studied surface-directed channels. These channels were created between two stacked glass slides that were physically flat but chemically patterned. The working fluids used for such channels were mostly water solutions, though organic solvents are important in some applications such as organic synthesis. In this study, novel surface-directed channels were developed, which could contain various organic solvents including xylene, nitrobenzene, and dimethyl sulfoxide. The glass slides used for these channels were previously ground by an abrasive and treated with (tridecafluoro-1,1,2,2-tetrahydrooctyl)trimethoxysilane. Xylene continuously flowed through a 1 mm wide, 40 mm long, and 0.14 mm deep channel at flow rates up to 99.99 microL min(-1).