RSS Feed - Research MicroContactPrinting Reversible patterning and actuation of hydrogels by electrically assisted ionoprinting 2013-10-22 08:32:46 378 Author: Etienne Palleau, Daniel Morales, Michael D. Dickey & Orlin D. Velev <br> Journal: nature <br> Publication Date: 08/03/2013 <br> Abstract: The ability to pattern, structure, re-shape and actuate hydrogels is important for biomimetics, soft robotics, cell scaffolding and biomaterials. Here we introduce an ‘ionoprinting’ technique with the capability to topographically structure and actuate hydrated gels in two and three dimensions by locally patterning ions via their directed injection and complexation, assisted by electric fields. The ionic binding changes the local mechanical properties of the gel to induce relief patterns and, i... Organic transistors realized by an environmental friendly microcontact printing approach 2013-06-12 07:36:46 377 Author: Amare Benor, Benedikt Gburek, Veit Wagner, Dietmar Knipp <br> Journal: Organic Electronics <br> Publication Date: 05/01/2010 <br> Abstract: A patterning method was developed that allows for combining the advantages of a low cost microcontact printing process on rigid and flexible substrates with the advantages of conventional semiconductor processing. The patterning approach combines printing of self-assembled monolayers with selective dewetting while being compatible with conventional semiconductor processes. Alkyl thiol self-assembled monolayers were printed on gold and silver films on rigid and flexible substrates. The printed r... Fabrication of tunable micropatterned substrates for cell patterning via microcontact printing of polydopamine with poly(ethylene imine)-grafted copolymers 2013-06-12 07:37:27 376 Author: Hsiu-Wen Chien, Wei-Bor Tsae <br> Journal: Acta Biomaterialia <br> Publication Date: 10/01/2012 <br> Abstract: Cell patterning is an important tool for biomedical research. In this work, we modified a technique combining mussel-inspired surface chemistry and microcontact printing (μCP) to modulate surface chemistry for cell patterning. Polymerized dopamine on poly(dimethylsiloxane) stamps was transferred to several cell-unfavorable substrates via μCP. Since cells only attached to the polydopamine (PDA)-imprinted areas, cell patterns were formed on a variety of cell-unfavorable surfaces. The stability of... Microcontact printing of novel co-polymers in combination with proteins for cell-biological applications 2013-06-12 07:27:49 375 Author: Gabor Csucs, Roger Michel, Jost W Lussi, Marcus Textor, Gaudenz Danuser <br> Journal: Biomaterials <br> Publication Date: 05/02/2003 <br> Abstract: Microcontact printing (μcP) is a cost effective and simple method to create chemically micropatterned surfaces for cell biological applications. We have combined the technique with the spontaneous molecular assembly of a polycationic PEG-grafted copolymer, poly-l-lysine-g-poly(ethylene glycol) (PLL-g-PEG). PLL-g-PEG with ω-functionalized PEG chains was print-transferred onto tissue culture polystyrene (TCPS) or glass substrates, resulting in patterns with a lateral resolution down to 1 μm. Subs... Consecutive microcontact printing — ligands for asymmetric catalysis in silicon channels 2013-06-12 07:24:54 374 Author: Helene Andersson, Christina Jönsson, Christina Moberg, Göran Stemme <br> Journal: Sensors and Actuators B: Chemical <br> Publication Date: 09/25/2001 <br> Abstract: Consecutive microcontact printing (μCP) has been developed to enable multiple functionalization of silicon surfaces, such as the immobilization of chiral ligands. The technique involves two subsequent printing steps using unstructured poly(methylsiloxane) stamps. The pattern is already defined on the substrate, consisting of etched channels. Hence, no precise alignment is needed between the two printing steps. A carboxylic acid group containing reagent was initially printed onto the silicon oxi... Microcontact printing of Concanavalin A and its effect on mammalian cell morphology 2013-06-12 07:22:03 373 Author: Tamal Das, Sanjaya K. Mallick, Debashish Paul, Sujit K. Bhuti, Tarun K. Bhattacharyya, Tapas K. Maitia <br> Journal: Journal of Colloid and Interface Science <br> Publication Date: 10/01/2007 <br> Abstract: In this study a major lectin called Concanavalin A (ConA) has been micropatterned on a glass substrate by microcontact printing and the patterns have been characterized with fluorescent and atomic force microscope for their uniformity. Interaction of the patterns with mammalian cells has been investigated by culturing L929 mouse fibroblast cells on the ConA printed glass surface. Cell culture results obtained from the microcontact printed patterns have also been compared and benchmarked with an... A novel and simple microcontact printing technique for tacky, soft substrates and/or complex surfaces in soft tissue engineering 2013-06-12 07:18:52 372 Author: Haiyang Yu, Sijing Xiong, Chor Yong Tay, Wen Shing Leong, Lay Poh Tan <br> Journal: Acta Biomaterialia <br> Publication Date: 03/01/2012 <br> Abstract: Microcontact printing (μCP) has attracted much interest due to its simplicity and wide range of applications. However, when conventional μCP is applied to soft and/or tacky substrates, substrate sagging and difficulty in stamp removal cause non-conformance in the patterns. Moreover, it is almost impossible to apply conventional μCP on complex or wavy surfaces. In this study, we developed a novel yet simple trans-print method to create efficient micropatterning on soft and/or tacky substrates su... Soft lithography for micro- and nanoscale patterning 2013-05-13 11:56:03 371 Author: Dong Qin, Younan Xia, George M Whitesides <br> Journal: Nature Protocols <br> Publication Date: 02/18/2010 <br> Abstract: This protocol provides an introduction to soft lithography—a collection of techniques based on printing, molding and embossing with an elastomeric stamp. Soft lithography provides access to three-dimensional and curved structures, tolerates a wide variety of materials, generates well-defined and controllable surface chemistries, and is generally compatible with biological applications. It is also low in cost, experimentally convenient and has emerged as a technology useful for a number of appli... Dynamic PDMS inking for DNA patterning by soft lithography 2013-05-13 11:53:01 370 Author: J. Fredonnet, J. Foncy, S. Lamarre, J-C. Cau, E. Trévisiol, J-P. Peyrade, J-M. François, C. Séverac. <br> Journal: Microelectronic Engineering <br> Publication Date: 03/29/2013 <br> Abstract: Microcontact printing (μCP) is used as a patterning technique to produce simple, rapid and cost-effective DNA microarrays. The accuracy of the final transferred pattern drastically depends on the inking step. The usual way to ink a PDMS stamp by droplet deposition of labeled biomolecules using a pipette, results in irregular transfer of the biomolecules on the chip surface and leads to poor and irreproducible fluorescent signals. These drawbacks are likely due to irregular ‘coating’ of the biom... Comparison of polyurethane and epoxy resist master mold for nanoscale soft lithography 2013-05-13 11:49:18 369 Author: J Foncy, JC Cau, C Bartual-Murgui, JM François, Emmanuelle Trévisiol, Childérick Sévérac <br> Journal: Microelectronic Engineering <br> Publication Date: 03/29/2001 <br> Abstract: Microcontact printing (μCP) is used as a patterning technique to produce simple, rapid and cost-effective DNA microarrays. The accuracy of the final transferred pattern drastically depends on the inking step. The usual way to ink a PDMS stamp by droplet deposition of labeled biomolecules using a pipette, results in irregular transfer of the biomolecules on the chip surface and leads to poor and irreproducible fluorescent signals. These drawbacks are likely due to irregular ‘coating’ of the biom...