eprintid: 10185378
rev_number: 15
eprint_status: archive
userid: 699
dir: disk0/10/18/53/78
datestamp: 2024-01-12 14:44:44
lastmod: 2024-06-04 14:33:26
status_changed: 2024-01-12 14:44:44
type: article
metadata_visibility: show
sword_depositor: 699
creators_name: Shi, Jing
creators_name: Cagney, Neil
creators_name: Tatum, John
creators_name: Condie, Angus
creators_name: Castrejón-Pita, J Rafael
title: Jetting and droplet formation of particle-loaded fluids
ispublished: pub
divisions: UCL
divisions: B04
divisions: C05
divisions: F45
note: Copyright © 2024 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
abstract: Inkjet printing is an attractive method for patterning and fabricating objects across many areas of industry. There is a growing interest in the
printing of inks with high particle-loading, such as inks containing glass frit, ceramic and functional inks. However, the use of these inks is
often limited due to uncertainty regarding the impact of their rheology on the printing process. Understanding of the role of complex rheology in the jetting of loaded inks is therefore needed to facilitate the wider application of inkjet printing. Here, we characterize the complex
rheology and the jetting of model dispersion inks (containing 10, 15, and 23 vol. % TiO2 nanoparticles) and compared them with those without particles. The jetting of the model fluids was conducted with a commercial inkjet printhead (nozzle diameter 34 lm) and visualized with
stroboscopic and ultra-high-speed imaging. For low particle concentrations, droplet formation is generally similar to those of unloaded inks,
provided their Ohnesorge number and Weber number are matched, although the filament of the loaded model fluid tends to have earlier
break-off, having a shorter length. The jetting reliability decreased with increase in particle-loading until reliable jetting can no longer be
achieved, due to local particle–particle interactions in the ink channel and in the filament during the fast extensional thinning process. A jetting map is presented which illustrates the influence of particle-loading on the droplet formation, and indicates that the acceptable range of
Ohnesorge number for jetting is reduced as the particle-loading is increased.
date: 2024-01
date_type: published
publisher: American Institute of Physics
official_url: https://doi.org/10.1063/5.0180014
oa_status: green
full_text_type: pub
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_id: 2139239
doi: 10.1063/5.0180014
lyricists_name: Castrejon Pita, Jose
lyricists_id: RCAST38
actors_name: Castrejon Pita, Jose
actors_id: RCAST38
actors_role: owner
funding_acknowledgements: 10003708 [InnovateUK - KTP]; EP/V04382X/1. [Engineering and Physical Sciences Research Council]; UCL IAA 2022-25 [Engineering and Physical Sciences Research Council]
full_text_status: public
publication: Physics of Fluids
volume: 36
number: 1
article_number: 017119
issn: 1070-6631
citation:        Shi, Jing;    Cagney, Neil;    Tatum, John;    Condie, Angus;    Castrejón-Pita, J Rafael;      (2024)    Jetting and droplet formation of particle-loaded fluids.                   Physics of Fluids , 36  (1)    , Article 017119.  10.1063/5.0180014 <https://doi.org/10.1063/5.0180014>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/10185378/1/Castrejon%20Pita_017119_1_5.0180014.pdf