Fabrication and characterisation of a 3-layer aorta-on-a-chip

Endothelial cells, EC, are the cell type closest to the blood stream in vessel walls. These cells can affect the origin of atherosclerosis, plaques clogging the vessels. The behaviour of EC is affected by neighbouring smooth muscle cells and shear stress from the blood flow. The aim with this thesis...

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Main Author: Svensson, Karolina
Format: Others
Language:English
Published: Uppsala universitet, Mikrosystemteknik 2017
Subjects:
COC
Online Access:http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-325955
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spelling ndltd-UPSALLA1-oai-DiVA.org-uu-3259552017-07-01T05:47:57ZFabrication and characterisation of a 3-layer aorta-on-a-chipengSvensson, KarolinaUppsala universitet, Mikrosystemteknik2017Organ-on-a-chipaorta-on-a-chipPDMSCOCmicrofabricationAPTESEngineering and TechnologyTeknik och teknologierMaterials EngineeringMaterialteknikEndothelial cells, EC, are the cell type closest to the blood stream in vessel walls. These cells can affect the origin of atherosclerosis, plaques clogging the vessels. The behaviour of EC is affected by neighbouring smooth muscle cells and shear stress from the blood flow. The aim with this thesis was to fabricate a structure for an aorta-on-a-chip that can be used to study these two parameters and their influence on EC and vascular diseases. Previous research using a two-channel system resulted in leakage and low viability of the muscle cells. A three-channel system has therefore been made to include a middle channel with the muscle cells incorporated in a gel. Cell medium is flowed in the outer channels to provide the cells with nutrition. The flow in the channel with EC has been calculated to correspond to the shear stress in an aorta. Membranes of polyethylene terephthalate and polycarbonate were used to divide the channels and both were shown to be compatible with EC. Different bonding procedures were investigated to manufacture leakage-free chips. In the study, adhesive bonding clogged the channels and the parameters for thermal bonding of COC, cyclic olefin copolymer, were not fully optimised. This made chemical bonding with layers of PDMS, polydimethylsiloxane, the best alternative. APTES, (3-Aminopropyl)triethoxysilane, treatment in addition to plasma treatment on the surfaces improved the bonding strength. Polycarbonate membranes got better results in the bonding tests than polyethylene terephthalate. The resulting aorta-on-a-chip was therefore successfully fabricated in PDMS and polycarbonate membranes using plasma and APTES treatment for bonding. Student thesisinfo:eu-repo/semantics/bachelorThesistexthttp://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-325955UPTEC Q, 1401-5773 ; 17009application/pdfinfo:eu-repo/semantics/openAccess
collection NDLTD
language English
format Others
sources NDLTD
topic Organ-on-a-chip
aorta-on-a-chip
PDMS
COC
microfabrication
APTES
Engineering and Technology
Teknik och teknologier
Materials Engineering
Materialteknik
spellingShingle Organ-on-a-chip
aorta-on-a-chip
PDMS
COC
microfabrication
APTES
Engineering and Technology
Teknik och teknologier
Materials Engineering
Materialteknik
Svensson, Karolina
Fabrication and characterisation of a 3-layer aorta-on-a-chip
description Endothelial cells, EC, are the cell type closest to the blood stream in vessel walls. These cells can affect the origin of atherosclerosis, plaques clogging the vessels. The behaviour of EC is affected by neighbouring smooth muscle cells and shear stress from the blood flow. The aim with this thesis was to fabricate a structure for an aorta-on-a-chip that can be used to study these two parameters and their influence on EC and vascular diseases. Previous research using a two-channel system resulted in leakage and low viability of the muscle cells. A three-channel system has therefore been made to include a middle channel with the muscle cells incorporated in a gel. Cell medium is flowed in the outer channels to provide the cells with nutrition. The flow in the channel with EC has been calculated to correspond to the shear stress in an aorta. Membranes of polyethylene terephthalate and polycarbonate were used to divide the channels and both were shown to be compatible with EC. Different bonding procedures were investigated to manufacture leakage-free chips. In the study, adhesive bonding clogged the channels and the parameters for thermal bonding of COC, cyclic olefin copolymer, were not fully optimised. This made chemical bonding with layers of PDMS, polydimethylsiloxane, the best alternative. APTES, (3-Aminopropyl)triethoxysilane, treatment in addition to plasma treatment on the surfaces improved the bonding strength. Polycarbonate membranes got better results in the bonding tests than polyethylene terephthalate. The resulting aorta-on-a-chip was therefore successfully fabricated in PDMS and polycarbonate membranes using plasma and APTES treatment for bonding.
author Svensson, Karolina
author_facet Svensson, Karolina
author_sort Svensson, Karolina
title Fabrication and characterisation of a 3-layer aorta-on-a-chip
title_short Fabrication and characterisation of a 3-layer aorta-on-a-chip
title_full Fabrication and characterisation of a 3-layer aorta-on-a-chip
title_fullStr Fabrication and characterisation of a 3-layer aorta-on-a-chip
title_full_unstemmed Fabrication and characterisation of a 3-layer aorta-on-a-chip
title_sort fabrication and characterisation of a 3-layer aorta-on-a-chip
publisher Uppsala universitet, Mikrosystemteknik
publishDate 2017
url http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-325955
work_keys_str_mv AT svenssonkarolina fabricationandcharacterisationofa3layeraortaonachip
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