Inkjet Printing of Layer-by-Layer Assembled Poly(lactide) Stereocomplex with Encapsulated Proteins

Direct inkjet printing is a versatile additive manufacturing technology to produce complex three-dimensional components from ceramic suspensions. By successive printing of cross-sections, the sample is built up layer by layer. The aim of this paper is to show the different possibilities of direct inkjet printing of ceramic suspensions, like printing of oxide (3Y-TZP, Al2O3, and ZTA) or nonoxide (Si3N4, MoSi2) ceramics, featuring microstructures, laminates, three-dimensional specimens, and dispersion ceramics. A modified thermal inkjet printer was used and the ink replaced by aqueous ceramic suspensions of high solids content. The suspensions were processed in an attrition mill or agitator bead mill to reduce the grain size <1 μm to avoid clogging of printhead nozzles. Further significant parameters are rheological properties (viscosity and surface tension) and solids content which were adjusted to the requirements of the printheads. The printed and sintered samples were analysed by SEM. Mechanical properties of 3Y-TZP samples were examined as well by use of the ball-on-three-balls test. The biaxial flexural strength of 3Y-TZP specimens was up to 1393 MPa with a Weibull modulus of 10.4 for small specimens (3 × 4×0.3 mm3).

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Oxygen concentration and conversion distributions in a layer-by-layer UV-cured film used as a simplified model of a 3D UV inkjet printing system

Chemical Engineering Science ◽

10.1016/j.ces.2016.10.050 ◽

2017 ◽

Vol 158 ◽

pp. 569-579 ◽

Cited By ~ 6

Author(s):

Kentaro Taki ◽

Yoshihito Watanabe ◽

Tadao Tanabe ◽

Hiroshi Ito ◽

Masahiro Ohshima

Keyword(s):

Oxygen Concentration ◽

Inkjet Printing ◽

Simplified Model ◽

Layer By Layer ◽

Printing System

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Self-Assembled Gels from Biological and Synthetic Polyelectrolytes.

MRS Proceedings ◽

10.1557/opl.2012.857 ◽

2012 ◽

Vol 1418 ◽

Author(s):

Paul Calvert ◽

Skander Limem ◽

Don McCallum ◽

Gordon Wallace ◽

Marc in het Panhuis

Keyword(s):

Elemental Analysis ◽

Inkjet Printing ◽

Polymer Complex ◽

Layer By Layer ◽

Diffusion Kinetics ◽

Swelling Properties ◽

Characterization Methods ◽

Counter Ions ◽

Cationic Polyelectrolytes ◽

And Diffusion

ABSTRACTInkjet printing of alternate layers of anionic and cationic polyelectrolytes allows organized gels to form with structures similar to those made by layer--by-layer dipping methods but very much faster. Structures of gels formed using slow and fast inkjet printing systems are compared using elemental analysis, swelling and diffusion kinetics as characterization methods. After printing and washing, most sodium or chloride counter-ions are last from the gel, leave only the polymer complex. The swelling properties of the printed and washed gel depend on the deposition rate and on the ratio of the two polymers as originally printed. The synthetic polyelectrolytes reported here can be compared with biological polyelectrolytes reported earlier by us.

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Inkjet Printing Based Layer-by-Layer Assembly Capable of Composite Patterning of Multilayered Nanofilms

Macromolecular Materials and Engineering ◽

10.1002/mame.201700332 ◽

2017 ◽

Vol 302 (12) ◽

pp. 1700332 ◽

Cited By ~ 3

Author(s):

Moonhyun Choi ◽

Jiwoong Heo ◽

Daheui Choi ◽

Sunghee Hwangbo ◽

Jinkee Hong

Keyword(s):

Inkjet Printing ◽

Layer By Layer ◽

Layer By Layer Assembly ◽

Layer Assembly

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Feature Size Control by Layer-by-Layer Printing and Non-wettable Patterns for Inkjet Printing of Micro Metal Electrode

Journal of Electrical Engineering and Technology ◽

10.1007/s42835-021-00740-6 ◽

2021 ◽

Author(s):

Sung-min Sim ◽

Sang-Ho Lee ◽

Kwan Hyun Cho ◽

Jun Ho Yu

Keyword(s):

Inkjet Printing ◽

Size Control ◽

Metal Electrode ◽

Layer By Layer ◽

Feature Size ◽

Feature Size Control

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Study of Layer Formation During Droplet-Based Three-Dimensional Printing of Gel Structures

Journal of Manufacturing Science and Engineering ◽

10.1115/1.4036785 ◽

2017 ◽

Vol 139 (9) ◽

Cited By ~ 2

Author(s):

Kyle Christensen ◽

Yong Huang

Keyword(s):

Inkjet Printing ◽

High Speed ◽

Three Dimensional ◽

Layer By Layer ◽

Layer Formation ◽

High Speed Imaging ◽

Three Dimensional Printing ◽

Drop On Demand ◽

Image Velocimetry ◽

Dimensional Printing

Additive manufacturing, also known as three-dimensional (3D) printing, is an approach in which a structure may be fabricated layer by layer. For 3D inkjet printing, droplets are ejected from a nozzle, and each layer is formed droplet by droplet. Inkjet printing has been widely applied for the fabrication of 3D biological gel structures, but the knowledge of the microscale interactions between printed droplets is still largely elusive. This study aims to elucidate the layer formation mechanism in terms of the formation of single lines and layers comprised of adjacent lines during drop-on-demand inkjet printing of alginate using high speed imaging and particle image velocimetry. Inkjet droplets are found to impact, spread, and coalesce within a fluid region at the deposition site, forming coherent printed lines within a layer. The effects of printing conditions on the behavior of droplets during layer formation are discussed and modeled based on gelation dynamics, and recommendations are presented to enable controllable and reliable fabrication of gel structures. The effects of gelation on droplet impact dynamics are found to be negligible during alginate printing, and interfaces are found to form between printed lines within a layer depending on printing conditions, printing path orientation, and gelation dynamics.

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