NDLI: Ultrasonic fabrication of micro nozzles from a stack of PVDF foils for generating and characterizing microfluidic dispersions

Content Provider	Springer Nature Link
Author	Liao, S. Sackmann, J. Tollkötter, A. Pasterny, M. Kockmann, N. Schomburg, W. K.
Copyright Year	2015
Abstract	Nozzles with circular cross-section and a diameter varying in axial direction have been fabricated in a microfluidic channel from polyvinylidene fluoride as chemically resistive thermoplastic polymer. Smallest diameter and length of the nozzle are approximately 150 µm and 3.4 mm, respectively. The nozzle and the entire channel system have been fabricated from two halves generated by ultrasonic hot embossing and bonded to each other by ultrasonic welding. Alignment during ultrasonic welding was assisted by a fit of energy directors and an accuracy of 35 and 10 µm in normal and lateral direction, respectively, was obtained. Thermoplastic molding of the two halves of the channel structures was performed by ultrasonic hot embossing with a cycle time of a few seconds. The development was significantly accelerated by milling the tools directly into aluminum plates. This way, new designs were realized within a day. The micro nozzles have been proven generating liquid/liquid dispersions of different flow patterns as a function of flow velocity and Capillary number.
Starting Page	695
Ending Page	702
Page Count	8
File Format	PDF
ISSN	09467076
Journal	Microsystem Technologies
Volume Number	23
Issue Number	3
e-ISSN	14321858
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-11-04
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Electronics and Microelectronics, Instrumentation Nanotechnology Mechanical Engineering
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering Hardware and Architecture

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