This presentation provides a snapshot of the research performed in my lab'. The publication list is up-to-date as of January 2009.

1. The Inkjet Printing Group
Group Leader: Dr. Patrick J. Smith
Head Technician: Frau Ute Löffelmann
Ph.D. Student: Herr Dario Mager
HiWi Student: Herr Henning Meier
Date of last update: January 27th 2009

2. Inkjet Printing – What you want, Where you want, When you want
The research of the laboratory of inkjet printing is interested in using
piezo-electric drop-on-demand inkjet printing as a dispensing tool for
the deposition of a wide range of materials. These materials are
organic, inorganic or biological. The main advantage of piezo-electric
inkjet printing is that it is able to deliver precise amounts of material to
a pre-determined position on a substrate. The laboratory is interested
in using inkjet printing as a low-cost, rapid manufacturing technique;
either to use inkjet printing to produce masks, to produce “maskless”
features, tapes or three dimensional structures.
Narrow features, rapid and low-cost fabrication
The laboratory is also interested in using inkjet printing in conjunction
with other patterning techniques such as micro-contact printing, which
uses stamps and patterned blocks to obtain exceptionally small features.
Here the surface energy of a substrate is modified by the application of
a non-wetting layer. Nano-embossing, MIMIC and soft lithography
have also been used to obtain features that are 20 microns or thinner.
Surface Science – The substrate is not passive
All substrates have associated surface energies, which have a direct
effect on features that are printed onto them. Of current interest is the
‘coffee stain’ effect, which is the phenomenon whereby suspended
material preferentially deposits at the boundary of a drying droplet.
Obviously, when one is using a liquid-handling approach, such as inkjet
printing, for feature formation one must understand how the as-printed
liquid behaves upon a substrate in order to obtain the desired shape.
Date of last update: January 27th 2009

3. Publications
2009
Chapter: “The Behaviour of an Ink Droplet on the Substrate,” PJ Smith,
‘The Chemistry Behind Inkjet Inks and Digital Printing’ Ed: Prof’ Shlomo Magdassi,
World Scientific Publishing, Singapore, Spring 2009.
2008
“Inkjet printing as a deposition and patterning tool for polymers and inorganic particles”
E Tekin, PJ Smith and US Schubert
Soft Matter, 2008, 4, 703
“‘Invisible’ silver tracks produced by combining hot-embossing and inkjet printing”
C Hendriks, PJ Smith, J Perelaer, AMJ v.d. Berg, and US Schubert
Advanced Functional Materials, 2008, 18, 1031
“The preferential deposition of silica micro-particles at the boundary of inkjet printed droplets”
J Perelaer, PJ Smith, C Hendriks, AMJ v.d.Berg and US Schubert
Soft Matter, 2008, 4, 1072
“Theoretical investigation of the influence of nozzle diameter variation on the
fabrication of TFT LCD colour filters,”
D-Y Shin and PJ Smith
Journal of Applied Physics, 2008, 103, 114905
“Inkjet printing of structures for MRI Coils,”
D Mager, U Löffelmann, PJ Smith, A Peter, L del Tin and JG Korvink,
Proceedings of Digital Fabrication 2008
“Inkjet printing silver-containing inks,”
PJ Smith, D Mager, U Löffelmann, JG Korvink,
Proceedings of Digital Fabrication 2008 Date of last update: January 27th 2009

4. Publications
2007
“Inkjet printing of luminescent CdTe nanocrystal/polymer composites
E Tekin, PJ Smith, S Hoeppener, AMJ van den Berg, AS Susha, J Feldman, AL Rogach and US Schubert,
Advanced Functional Materials, 2007, 17, 23
“Inkjet printing of polyurethane colloidal suspensions”
AMJ v.d.Berg, PJ Smith, J Perelaer and US Schubert,
Soft Matter 2007, 3, 238
“Geometric Control of Inkjet Printed Features Using a Gelating Polymer”
AMJ v.d.Berg, AWM de Laat, PJ Smith, J Perelaer and US Schubert,
Journal of Materials Chemistry 2007, 17, 677
“Phase Change Rapid Prototyping with Aqueous Inks”
D Mager, PJ Smith and JG Korvink,
Proceedings of Digital Fabrication 2007, 908
2006
“Direct Ink-jet Printing and Low Temperature Conversion
of Conductive Silver Patterns”
PJ Smith, D-Y Shin, N Reis, J Stringer and B Derby;
Journal of Materials Science. 2006, 41, 4153
2005
“A low curing temperature silver ink for use in
ink-jet printing and subsequent production of
conductive tracks”
AL Dearden, PJ Smith, D-Y Shin,
N Reis, B Derby and P O’Brien;
Macromol. Rapid Commun., 2005, 26, 315
Date of last update: January 27th 2009

5. Publications in Preparation
“Droplet Tailoring Using Evaporative Inkjet Printing”
J Perelaer, PJ Smith, MMP Wijnen, E v.d.Bosch, R Eckardt, PHJM Ketelaars and US Schubert
Macromolecular Chemistry and Physics, Accepted
“The Spreading of Inkjet Printed Droplets with a Varied Polymer’s Molecular Weight on a Dry Solid Substrate”
J Perelaer, PJ Smith, E v.d.Bosch, SSC van Grootel, PHJM Ketelaars and US Schubert
Macromolecular Chemistry and Physics, Accepted
“Room Temperature Preparation of Conductive Silver Features using Spin-coating and Inkjet Printing”
JJP Valeton, K Hermans, CWM Bastiaansen, DJ Broer, J Perelaer, US Schubert, GP Crawford and PJ Smith
Advanced Materials, to be submitted (February 2009)
“Inkjet Printed, Conductiver, 25 mm Wide Silver Tracks on Unstructured Polyimide,”
H. Meier, U Löffelmann, D Mager, PJ Smith, JG Korvink
Advanced Materials, Submitted (December 2008)
“An MRI Receiver Coil Produced Directly by Inkjet Printing”
D Mager, U Löffelmann, PJ Smith, JG Korvink
Advanced Functional Materials, to be submitted (February 2009)
“Inkjet Printing of Proteins,” JT Delaney, PJ Smith and US Schubert,
In preparation
Date of last update: January 27th 2009