Determination of dynamic contact angles within microfluidic devices

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F18%3A73591513" target="_blank" >RIV/61989592:15310/18:73591513 - isvavai.cz</a>

Alternative codes found

RIV/00216305:26220/18:PU130844

Result on the web

<a href="https://link.springer.com/article/10.1007%2Fs10404-018-2066-0" target="_blank" >https://link.springer.com/article/10.1007%2Fs10404-018-2066-0</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10404-018-2066-0" target="_blank" >10.1007/s10404-018-2066-0</a>

Result language

angličtina

Original language name

Determination of dynamic contact angles within microfluidic devices

Original language description

Here, we report a single-point detection method for the determination of dynamic surface conditions inside microfluidic channels. The proposed method is based on monitoring fluorescence amplitude as a function of the convolution of a laser beam with segmented flow consisting of two immiscible liquids, one containing fluorescent dye. The fluorescence amplitude is determined by the flow rate and the droplet shape, which is affected by the channel surface properties. We modeled the interaction of a droplet and a laser beam via computer-aided design software, using the laser beam location in relation to the droplet shape as a parameter. The method was applied to fused silica capillaries with both unmodified and modified surfaces, with segmented flow exhibiting water contact angles of approximate to 30 degrees and approximate to 100 degrees, respectively. The method allows discrimination between hydrophillic and hydrophobic surfaces, as well as the quality of the treatment. The results were verified using fluorescence imaging of the droplets via a stroboscopic technique. We also applied this method to the analysis of microfabricated channels with non-circular cross sections. We demonstrated that the technique enables the determination of the hydrophobicity of channel surfaces, a crucial property required for the generation of segmented flow or emulsions for applications such as digital PCR.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10406 - Analytical chemistry

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Microfluidics and Nanofluidics

ISSN

1613-4982

e-ISSN

—

Volume of the periodical

22

Issue of the periodical within the volume

5

Country of publishing house

DE - GERMANY

Number of pages

11

Pages from-to

"51-1"-"51-11"

UT code for WoS article

000432265200007

EID of the result in the Scopus database

2-s2.0-85045741480