Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/20713
Title: Development of microfluidic device for on-chip measurement of surface tension
Authors: Nang, Thazin Phway
Keywords: DRNTU::Engineering::Aeronautical engineering
Issue Date: 2009
Abstract: This report relates the experiments conducted using a microfluidic surface tension sensor made from Polydimethylsiloxane (PDMS). The sensor is able to measure both surface tension (liquid/air interface) and interfacial tension (liquid/liquid interface). The sensor prototype contains a microchannel network for droplet formation and an optical system for bubble detection. The optical system consists of an optical fibre from a laser source which is inserted into a channel normal to the outlet channel. Another optical fibre inserted into a channel on the other side of the outlet channel receives the light signal. For the surface tension measurement, the liquid sample is introduced into a main channel, while air is introduced into a T-junction. For the interfacial tension measurement, the immiscible liquid such as oil is introduced into a main channel, while the sample liquid is introduced into a T-junction. The formation frequency of the micro bubbles is a function of the surface tension between the two phases. The frequency can be measured by optical detection. Bubble formation experiments were carried out using Distilled water with various TWEEN20 surfactant concentrations as the continuous phase and Nitrogen gas as the dispersed phase. Droplet experiments were carried out using pure Mineral Oil and Mineral Oil with various Span 80 surfactant concentrations as the continuous phase and Distilled water as the dispersed phase.The effect of varying the pressure, flow rate, type of fluid and the surfactant concentration on the bubble size, shape and formation frequency were collected.
URI: http://hdl.handle.net/10356/20713
Rights: Nanyang Technological University
Fulltext Permission: restricted
Fulltext Availability: With Fulltext
Appears in Collections:MAE Student Reports (FYP/IA/PA/PI)

Files in This Item:
File Description SizeFormat 
mA203.pdf
  Restricted Access
2.61 MBAdobe PDFView/Open

Page view(s) 50

246
Updated on Dec 1, 2020

Download(s)

7
Updated on Dec 1, 2020

Google ScholarTM

Check

Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.