From colloidal spheres to nanofibrils: Extensional flow properties of mineral pigment and mixtures with micro and nanofibrils under progressive double layer suppression

Dimić-Mišić, Katarina; Hummel, Michael; Paltakari, Jouni; Sixta, Herbert; Maloney, Thaddeus; Gane, Patrick

doi:10.1016/j.jcis.2015.01.004

Cited by 24 publications

(21 citation statements)

References 72 publications

(168 reference statements)

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“…The subsequent evolution of the liquid bridge after it has been separated to a set distance until subsequent breakage under the action of capillary pressure was monitored and compared. 28,29 Ink samples were placed between two parallel 3-mm-diameter stainless steel plates held at a 1-mm gap, where the upper plate was then moved upwards at a constant velocity. The following change in minimum diameter over time until separation point was then recorded and measured.…”

Section: Rheological and Extensional Testingmentioning

confidence: 99%

High-speed imaging the effect of snap-off distance and squeegee speed on the ink transfer mechanism of screen-printed carbon pastes

et al. 2019

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Screen printing is the most widely used process in the production of printed electronics due to its ability to consistently transfer inks containing a wide range of functional materials onto a range of substrates. However, despite its extensive use, the mechanism by which the ink is transferred through the mesh and onto the substrate is not fully understood. Existing theories are contradictory and lack experimental validation. Therefore, high-speed imaging was used in combination with a screen-printing simulation rig that was designed to provide good optical access to study ink deposition during the screen-printing process. The variation in the four stages of ink flow through the screen, described in the theory by Messerschmitt, has been quantified with respect to changes in snap-off distance and squeegee speed. Analyses of the images were compared with measurements of the ink properties and corroborated with analyses of the prints. This has provided a better understanding of the mechanism by which the ink transfers from the mesh to the substrate and subsequently separates in screen printing. This could be used as the basis for the development of predictive algorithms, as well as to improve the understanding of how to optimize print quality and performance.

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Section: Rheological and Extensional Testingmentioning

confidence: 99%

High-speed imaging the effect of snap-off distance and squeegee speed on the ink transfer mechanism of screen-printed carbon pastes

et al. 2019

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“…Generation of silanol groups through the hydrolysis probably increased the ionic strength. Increased ionic strength has been reported to compress the double layer of colloidal particles [12]. The generation of silanol groups therefore decreased the double-layer repulsion between the nuclei.…”

Section: Surface-modificationmentioning

confidence: 98%

Fabrication and Surface-Modification of Silica/Gadolinium Compound/Silica Core-Shell Nanoparticles Discovered by Transmission Electron Microscopy

Kawamata¹,

Inose²,

Kobayashi³

2019

IJTAN

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The present work describes methods for fabricating multilayered core-shell nanoparticles composed of silica (SiO2) as a core, gadolinium compound (GdC) as an inner shell, and SiO2 as an outer shell (SiO2/GdC/SiO2) toward colloidally-stable, inert magnetic resonance imaging contrast agent, and for surface-modifying the SiO2/GdC/SiO2 nanoparticles toward immobilization of functional molecules on the SiO2/GdC/SiO2. SiO2 nanoparticles (particle size by transmission electron microscopy (TEM): 28.6±12.6 nm) were produced by a sol-gel method using tetraethylorthosilicate (TEOS) and methylamine in water/ethanol solution. GdC-coated SiO2 nanoparticles (SiO2/GdC) (GdC shell thickness by TEM: 35.9±4.9 nm) were synthesized by a homogeneous precipitation method using water/propanol solution containing the SiO2 nanoparticles, Gd(NO3)3, urea and polyvinylpyrrolidone. Succeeding SiO2coating of the SiO2/GdC nanaoparticles was performed by using TEOS and NaOH in the presence of SiO2/GdC nanoparticles. Consequently, SiO2/GdC/SiO2 nanoparticles (SiO2 shell thickness by TEM: 8.5±2.7 nm) could be obtained. The SiO2/GdC/SiO2 nanoparticles were successfully surface-modified by using 3aminopropyltrimethoxysilane for amination, and by followingly using succinic anhydride for carboxylation.

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“…Generation of silanol groups through the hydrolysis probably increased the ionic strength. Increased ionic strength has been reported to compress the double layer of colloidal particles [6]. The generation of silanol groups therefore decreased the double-layer repulsion between the nuclei.…”

Section: Surface-modification Of Nanoparticlesmentioning

confidence: 98%

Fabrication and Surface-Modification of Silica/Gadolinium Compound/Silica Core-Shell Nanoparticles

Kawamata¹,

Inose²,

Kobayashi³

2018

International Conference of Theoretical and Applied Nanoscience and Nanotechnology

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-The present work describes methods for fabricating multilayered core-shell nanoparticles composed of silica (SiO 2 ) as a core, gadolinium compound (GdC) as an inner shell, and SiO 2 as an outer shell (SiO 2 /GdC/SiO 2 ), and for surface-modifying the SiO 2 /GdC/SiO 2 nanoparticles. SiO 2 nanoparticles with an average size of 28.6±12.6 nm were produced by a sol-gel method using tetraethylorthosilicate (TEOS) and methylamine in water/ethanol solution. GdC-coated SiO 2 nanoparticles(SiO 2 /GdC) with an average particle size of 107.0±23.0 nm and an average GdC shell thickness of 35.9±4.9 nm were synthesized by a homogeneous precipitation method at 80°C in water/propanol solution containing Gd(NO 3 ) 3 , urea and polyvinylpyrrolidone in the presence of the SiO 2 nanoparticles. Succeeding SiO 2 -coating of the SiO 2 /GdC nanaoparticles was performed by using TEOS and NaOH in the presence of SiO 2 /GdC nanoparticles. Consequently, SiO 2 /GdC/SiO 2 nanoparticles with an average particle size of 119.0±39.0 nm and an average SiO 2 shell thickness of 8.5±2.7 nm could be obtained. The SiO 2 /GdC/SiO 2 nanoparticles were successfully surface-modified by using 3-aminopropyltrimethoxysilane for amination, and by followingly using succinic anhydride for carboxylation.

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From colloidal spheres to nanofibrils: Extensional flow properties of mineral pigment and mixtures with micro and nanofibrils under progressive double layer suppression

Cited by 24 publications

References 72 publications

High-speed imaging the effect of snap-off distance and squeegee speed on the ink transfer mechanism of screen-printed carbon pastes

High-speed imaging the effect of snap-off distance and squeegee speed on the ink transfer mechanism of screen-printed carbon pastes

Fabrication and Surface-Modification of Silica/Gadolinium Compound/Silica Core-Shell Nanoparticles Discovered by Transmission Electron Microscopy

Fabrication and Surface-Modification of Silica/Gadolinium Compound/Silica Core-Shell Nanoparticles

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