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Synthetic microfluidic paper: high surface area and high porosity polymer micropillar arrays
KTH, Skolan för elektro- och systemteknik (EES), Mikro- och nanosystemteknik.ORCID-id: 0000-0001-8531-5607
KTH, Skolan för elektro- och systemteknik (EES), Mikro- och nanosystemteknik.
KTH, Skolan för elektro- och systemteknik (EES), Mikro- och nanosystemteknik.ORCID-id: 0000-0002-0441-6893
KTH, Skolan för elektro- och systemteknik (EES), Mikro- och nanosystemteknik.ORCID-id: 0000-0001-8248-6670
2016 (engelsk)Inngår i: Lab on a Chip, ISSN 1473-0197, E-ISSN 1473-0189, Vol. 16, nr 2, s. 298-304Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We introduce Synthetic Microfluidic Paper, a novel porous material for microfluidic applications that consists of an OSTE polymer that is photostructured in a well-controlled geometry of slanted and interlocked micropillars. We demonstrate the distinct benefits of Synthetic Microfluidic Paper over other porous microfluidic materials, such as nitrocellulose, traditional paper and straight micropillar arrays: in contrast to straight micropillar arrays, the geometry of Synthetic Microfluidic Paper was miniaturized without suffering capillary collapse during manufacturing and fluidic operation, resulting in a six-fold increased internal surface area and a three-fold increased porous fraction. Compared to commercial nitrocellulose materials for capillary assays, Synthetic Microfluidic Paper shows a wider range of capillary pumping speed and four times lower device-to-device variation. Compared to the surfaces of the other porous microfluidic materials that are modified by adsorption, Synthetic Microfluidic Paper contains free thiol groups and has been shown to be suitable for covalent surface chemistry, demonstrated here for increasing the material hydrophilicity. These results illustrate the potential of Synthetic Microfluidic Paper as a porous microfluidic material with improved performance characteristics, especially for bioassay applications such as diagnostic tests.

sted, utgiver, år, opplag, sider
Royal Society of Chemistry, 2016. Vol. 16, nr 2, s. 298-304
Emneord [en]
OSTE, paper microfluidics, microfluidics, porous microfluidics, Lab-on-a-Chip, diagnostics, micropillars
HSV kategori
Forskningsprogram
Bioteknologi
Identifikatorer
URN: urn:nbn:se:kth:diva-180009DOI: 10.1039/C5LC01318FISI: 000367953700010PubMedID: 26646057Scopus ID: 2-s2.0-84953410894OAI: oai:DiVA.org:kth-180009DiVA, id: diva2:891152
Forskningsfinansiär
EU, FP7, Seventh Framework Programme
Merknad

QC 20160115

Tilgjengelig fra: 2016-01-05 Laget: 2016-01-05 Sist oppdatert: 2020-03-09bibliografisk kontrollert
Inngår i avhandling
1. From Lab to Chip – and back: Polymer microfluidic systems for sample handling in point-of-care diagnostics
Åpne denne publikasjonen i ny fane eller vindu >>From Lab to Chip – and back: Polymer microfluidic systems for sample handling in point-of-care diagnostics
2016 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

This thesis contributes to the development of Lab-on-a-Chip systems that enables reliable, rapid medical diagnostics at the point-of-care. These contributions are focused on microfluidic Lab-on-a-Chip systems for sepsis diagnosis, autonomous sample-to-answer tests, and dried blood spot sampling.

Sepsis is a serious condition with high mortality and high costs for society and healthcare. To facilitate rapid and effective antibiotic treatment, improved sepsis diagnostics is needed. Diagnosis of sepsis requires the processing of relatively large blood volumes, creating a need for novel and effective techniques for the handling of large volume flows and pressures on chip. Components, materials, and manufacturing methods for pneumatically driven Lab-on-a-Chip systems have therefore been developed in this thesis. Microvalves, an essential component in many Lab-on-a-Chip systems have been the focus on several of the advances: a novel elastomeric material (Rubbery Off-Stoichiometric-Thiol-Ene-Epoxy) with low gas and liquid permeability; the first leak-tight vertical membrane microvalves, allowing large channel cross-sections for high volumetric flow throughput; and novel PDMS manufacturing methods enabling their realization. Additionally, two of the new components developed in this thesis focus on separation of bacteria from blood cells based on differences in particle size, and cell wall composition: inertial microfluidic removal of large particles in multiple parallel microchannels with low aspect ratio; and selective lysis of blood cells while keeping bacteria intact. How these components, materials and methods could be used together to achieve faster sepsis diagnostics is also discussed.

Lab-on-a-Chip tests can not only be used for sepsis, but have implications in many point-of-care tests. Disposable and completely autonomous sampleto- answer tests, like pregnancy tests, are capillary driven. Applying such tests in more demanding applications has traditionally been limited by poor material properties of the paper-based products used. A new porous material, called “Synthetic Microfluidic Paper”, has been developed in this thesis. The Synthetic Microfluidic Paper features well-defined geometries consisting of slanted interlocked micropillars. The material is transparent, has a large surface area, large porous fraction, and results in low variability in capillary flowrates. The fact that Synthetic Microfluidic Paper can be produced with multiple pore sizes in the same sheet enables novel concepts for self-aligned spotting of liquids and well-controlled positioning of functional microbeads.

Diagnostic testing can also be achieved by collecting the sample at the point-of-care while performing the analysis elsewhere. Easy collection of finger-prick blood in paper can be performed by a method called dried blood spots. This thesis investigates how the process of drying affects the homogeneity of dried blood spots, which can explain part of the variability that has been measured in the subsequent analysis. To reduce this variability, a microfluidic sampling chip has been developed in this thesis. The chip, which is capillary driven, autonomously collects a specific volume of plasma from a drop of blood, and dry-stores it in paper. After sampling, the chip can be mailed back to a central lab for analysis.

sted, utgiver, år, opplag, sider
Stockholm: KTH Royal Institute of Technology, 2016. s. xiii, 75
Serie
TRITA-EE, ISSN 1653-5146 ; 2016:002
HSV kategori
Forskningsprogram
Elektro- och systemteknik
Identifikatorer
urn:nbn:se:kth:diva-180740 (URN)978-91-7595-844-6 (ISBN)
Disputas
2016-02-05, F3, Lindstedtsvägen 26, KTH, Stockholm, 09:00 (engelsk)
Opponent
Veileder
Merknad

QC 20160122

Tilgjengelig fra: 2016-01-22 Laget: 2016-01-22 Sist oppdatert: 2016-01-22bibliografisk kontrollert

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Hansson_2016_Synthetic-microfluidic-paper.pdf(3923 kB)344 nedlastinger
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