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Self-transport and self-alignment of microchips using microscopic rain
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
Aalto University.
Aalto University.
Aalto University.
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2015 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 5, 14966Article in journal (Refereed) Published
Abstract [en]

Alignment of microchips with receptors is an important process step in the construction of integrated micro- and nanosystems for emerging technologies, and facilitating alignment by spontaneous self-assembly processes is highly desired. Previously, capillary self-alignment of microchips driven by surface tension effects on patterned surfaces has been reported, where it was essential for microchips to have sufficient overlap with receptor sites. Here we demonstrate for the first time capillary self-transport and self-alignment of microchips, where microchips are initially placed outside the corresponding receptor sites and can be self-transported by capillary force to the receptor sites followed by self-alignment. The surface consists of hydrophilic silicon receptor sites surrounded by superhydrophobic black silicon. Rain-induced microscopic droplets are used to form the meniscus for the self-transport and self-alignment. The boundary conditions for the self-transport have been explored by modeling and confirmed experimentally. The maximum permitted gap between a microchip and a receptor site is determined by the volume of the liquid and by the wetting contrast between receptor site and substrate. Microscopic rain applied on hydrophilic-superhydrophobic patterned surfaces greatly improves the capability, reliability and error-tolerance of the process, avoiding the need for accurate initial placement of microchips, and thereby greatly simplifying the alignment process.

Place, publisher, year, edition, pages
2015. Vol. 5, 14966
National Category
Manufacturing, Surface and Joining Technology Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:uu:diva-265291DOI: 10.1038/srep14966ISI: 000362486700001PubMedID: 26450019OAI: oai:DiVA.org:uu-265291DiVA: diva2:865051
Available from: 2015-10-26 Created: 2015-10-26 Last updated: 2017-12-01Bibliographically approved

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Publisher's full textPubMedhttp://www.nature.com/articles/srep14966

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Chang, BoHjort, Klas

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