scholarly journals Direct Ink Writing Glass: A Preliminary Step for Optical Application

2020 ◽  
Author(s):  
Bo Nan ◽  
Przemysław Gołębiewski ◽  
Ryszard Buczyński ◽  
F.J. Galindo Rosales ◽  
José Ferreira
Keyword(s):  
3D Printing ◽  
Fine Powder ◽  
Glass Frit ◽  
Direct Ink Writing ◽  
Base Materials ◽  
Alkaline Oxide ◽  
Fine Glass ◽  
Preliminary Study ◽  
High Alkali ◽  
Additional Phase

In this paper, we present a preliminary study and conceptual idea concerning 3D printing water-sensitive glass by exemplifying with a borosilicate glass with high alkali and alkaline oxide contents using direct ink writing. The investigated material was prepared in the form of a glass frit, which was further ground in order to obtain a fine powder of desired particle size distribution. In a following step, inks were prepared by mixing the fine glass powder with Pluoronic F-127 hydrogel. The acquired pastes were rheologically characterized and printed using a Robocasting device. DSC experiments were performed for base materials and the obtained green bodies. After sintering, SEM and XRD analyses were carried out in order to examine microstructure and the eventual presence of crystalline phase inclusions. Results confirmed that obtained inks exhibit stable rheological properties despite the propensity of glass to undergo hydrolysis and could be adjusted to desirable values for 3D printing. No additional phase was observed, supporting the suitability of the designed technology for the production of water sensitive glass inks. SEM micrographs of the sintered samples revealed the presence of closed porosity, which may be the main reason of light scattering.

scholarly journals Direct Ink Writing Glass: A Preliminary Step for Optical Application

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1636
Author(s):  
Bo Nan ◽  
Przemysław Gołębiewski ◽  
Ryszard Buczyński ◽  
Francisco J. Galindo-Rosales ◽  
José M. F. Ferreira
Keyword(s):  
3D Printing ◽  
Fine Powder ◽  
Glass Frit ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Direct Ink Writing ◽  
Base Materials ◽  
Alkaline Oxide ◽  
Fine Glass ◽  
High Alkali

In this paper, we present a preliminary study and conceptual idea concerning 3D printing water-sensitive glass, using a borosilicate glass with high alkali and alkaline oxide contents as an example in direct ink writing. The investigated material was prepared in the form of a glass frit, which was further ground in order to obtain a fine powder of desired particle size distribution. In a following step, inks were prepared by mixing the fine glass powder with Pluoronic F-127 hydrogel. The acquired pastes were rheologically characterized and printed using a Robocasting device. Differential scanning calorimetry (DSC) experiments were performed for base materials and the obtained green bodies. After sintering, scanning electron microscope (SEM) and X-ray diffraction (XRD) analyses were carried out in order to examine microstructure and the eventual presence of crystalline phase inclusions. The results confirmed that the as obtained inks exhibit stable rheological properties despite the propensity of glass to undergo hydrolysis and could be adjusted to desirable values for 3D printing. No additional phase was observed, supporting the suitability of the designed technology for the production of water sensitive glass inks. SEM micrographs of the sintered samples revealed the presence of closed porosity, which may be the main reason of light scattering.

scholarly journals Mimicking the Mechanical Properties of Aortic Tissue with Pattern-Embedded 3D Printing for a Realistic Phantom

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 5042
Author(s):  
Jaeyoung Kwon ◽  
Junhyeok Ock ◽  
Namkug Kim
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
3D Printing ◽  
Mechanical Characteristics ◽  
Aortic Wall ◽  
Tensile Tests ◽  
Human Aorta ◽  
Aortic Tissue ◽  
Medical Field ◽  
Base Materials

3D printing technology has been extensively applied in the medical field, but the ability to replicate tissues that experience significant loads and undergo substantial deformation, such as the aorta, remains elusive. Therefore, this study proposed a method to imitate the mechanical characteristics of the aortic wall by 3D printing embedded patterns and combining two materials with different physical properties. First, we determined the mechanical properties of the selected base materials (Agilus and Dragonskin 30) and pattern materials (VeroCyan and TPU 95A) and performed tensile testing. Three patterns were designed and embedded in printed Agilus–VeroCyan and Dragonskin 30–TPU 95A specimens. Tensile tests were then performed on the printed specimens, and the stress-strain curves were evaluated. The samples with one of the two tested orthotropic patterns exceeded the tensile strength and strain properties of a human aorta. Specifically, a tensile strength of 2.15 ± 0.15 MPa and strain at breaking of 3.18 ± 0.05 mm/mm were measured in the study; the human aorta is considered to have tensile strength and strain at breaking of 2.0–3.0 MPa and 2.0–2.3 mm/mm, respectively. These findings indicate the potential for developing more representative aortic phantoms based on the approach in this study.

The preliminary study of gradient AlSi alloy fabricated by 3D printing technology

2021 ◽  
Author(s):  
Shaoxin Huo ◽  
Qihai Chen ◽  
Yingqiao Zhou ◽  
Dawei Xing ◽  
Bin Wang
Keyword(s):  
3D Printing ◽  
Printing Technology ◽  
3D Printing Technology ◽  
Alsi Alloy ◽  
Preliminary Study

Fabrication of integrated microfluidic devices by direct ink writing (DIW) 3D printing

2019 ◽  
Vol 297 ◽  
pp. 126609 ◽  
Author(s):  
Terry Ching ◽  
Yingying Li ◽  
Rahul Karyappa ◽  
Akihiro Ohno ◽  
Yi-Chin Toh ◽  
...  
Keyword(s):  
3D Printing ◽  
Microfluidic Devices ◽  
Direct Ink Writing

3D printing vertically: Direct ink writing free-standing pillar arrays

2020 ◽  
Vol 35 ◽  
pp. 16-24 ◽  
Author(s):  
Bo Nan ◽  
Francisco J. Galindo-Rosales ◽  
José M.F. Ferreira
Keyword(s):  
3D Printing ◽  
Free Standing ◽  
Direct Ink Writing ◽  
Pillar Arrays

scholarly journals Preliminary Characterization of Novel LDPE-Based Wear-Resistant Composite Suitable for FDM 3D Printing

Materials ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 2520 ◽  
Author(s):  
Piotr Olesik ◽  
Marcin Godzierz ◽  
Mateusz Kozioł
Keyword(s):  
3D Printing ◽  
Tensile Tests ◽  
Waste Glass ◽  
Scanning Calorimetry ◽  
Path Direction ◽  
Pin On Disc ◽  
Static Tensile ◽  
Fine Glass ◽  
3D Printed ◽  
Ldpe Composites

Low-density polyethylene (LDPE) composites reinforced with finely powdered waste glass were identified as a potential material for 3D printed structures for use in low-duty frictional applications. A recently published 3D printing model was used to calculate the limits in the filament feed rate and printing speed. Tribological tests (pin-on-disc method) of the printed composites were performed for different print-path directions. Differential scanning calorimetry (DSC) was performed on the samples and the composites showed a higher crystallinity compared with LDPE, which partially explains the higher elastic modulus of the composites determined during static tensile tests. Using a fine glass powder as reinforcement improved the wear resistance of LDPE by 50% due to the formation of a sliding film on the sample’s surface. An evident effect of friction direction vs. the printed path direction on wear was found; which was likely related to differences in the removal of friction products from the friction area for different print-path directions. The LDPE composites with fine waste glass particles are promising materials for low-duty frictional applications and should be the subject of further research.

scholarly journals Surface Characteristics of Milled and 3D Printed Denture Base Materials Following Polishing and Coating: An In-Vitro Study

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3305
Author(s):  
Pablo Kraemer Fernandez ◽  
Alexey Unkovskiy ◽  
Viola Benkendorff ◽  
Andrea Klink ◽  
Sebastian Spintzyk
Keyword(s):  
Surface Roughness ◽  
3D Printing ◽  
In Vitro Study ◽  
Surface Characteristics ◽  
Denture Base ◽  
Liquid Resin ◽  
Base Materials ◽  
Superior Surface ◽  
3D Printed

(1) Background: To date, no information on the polishability of milled and 3D-printed complete denture bases has been provided, which is relevant in terms of plaque accumulation. (2) Methods: three groups (n = 30) were manufactured using the cold-polymerization polymethilmethacrilate, milling (SM) and 3D printing (AM). 10 specimens of each group were left untreated (reference). 10 more specimens were pre-polished (intermediate polishing) and 10 final specimens were highgloss polished. An additional 20 specimens were 3D printed and coated with the liquid resin (coated), 10 of which were additionally polished (coated + polished). For each group Ra and Rz values, gloss value and REM images were obtained. (3). The “highgloss-polished” specimens showed statistically lower Ra and Rz values in the SM, followed by AM and conventional groups. In the AM group statistically lower surfaces roughness was revealed for highgloss-polished, “coated + polished”, and “coated” specimens, respectively. (4) Conclusions: The milled specimens demonstrated superiors surface characteristics than 3D printed and conventionally produced after polishing. The polished specimens demonstrated superior surface characteristics over coated specimens. However, the surface roughness by both polished and coated specimens was within the clinically relevant threshold of 0.2 µm.

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