Effects of Fumed Silica on Thixotropic Behavior and Processing Window by UV-Assisted Direct Ink Writing

Jiang, Fengze; Zhou, Mei; Drummer, Dietmar

doi:10.3390/polym14153107

Cited by 10 publications

(9 citation statements)

References 33 publications

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“…This loading is comparable to the percolation threshold seen in the other reinforcement viscoelastic fluids, like silicone 42,47,48 or urethane acrylate. 19 Although 15 and 20 wt % loadings provided better yield strength, this significantly increased viscosity and further reduced the printing quality and speed. Rheology measurements were conducted to quantify the yield and flow characteristics of the inks.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…10 wt % silica was required to maintain dimensional fidelity throughout the printing and curing process. This loading is comparable to the percolation threshold seen in the other reinforcement viscoelastic fluids, like silicone ,, or urethane acrylate . Although 15 and 20 wt % loadings provided better yield strength, this significantly increased viscosity and further reduced the printing quality and speed.…”

Section: Resultsmentioning

confidence: 99%

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Shelf-Stable Bingham Plastic Polyurethane Thermosets for Additive Manufacturing

Wang,

Shen,

Forrester

et al. 2024

ACS Materials Lett.

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This study presents an innovative three-dimensional (3D) printing method for fabricating hybrid-hardness polyurethane (PU) thermosets via direct-ink writing (DIW). This method features an unprecedentedly long pot life of at least 16 months for uncured material, achieved by employing internally blocked polymeric uretdione as the isocyanate source. This innovation not only extends pot life but also broadens the preprint processing temperature range. Surfacemodified fumed silica, used as a rheology modifier, ensures the maintenance of the Bingham fluid characteristics. Rigorous evaluations, including differential scanning calorimetry (DSC), tensile tests, scanning electron microscopy (SEM), optical microscopy (OM), and micro-computed tomography (μ-CT), verify the material's uniform and nearly isotropic structure, devoid of defects. Dynamic mechanical analysis (DMA) reveals that these 3D-printed PUs withstand processing temperatures up to 240 °C. The practical application of this technology is demonstrated through the successful 3D printing of a shoe sole, showcasing the ability to incorporate regions of varying hardness and highlighting the versatile property customization of this method.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Shelf-Stable Bingham Plastic Polyurethane Thermosets for Additive Manufacturing

Wang,

Shen,

Forrester

et al. 2024

ACS Materials Lett.

View full text Add to dashboard Cite

show abstract

“…However, the use of dissolvable materials as supports helps to overcome this problem because they can be quickly removed after the printing process is complete. By using UV-curing equipment, the post-fabrication processing phases further aid in improving the printed item’s mechanical characteristics (such as elastic modulus) [ 57 ]. Figure 4 depicts a graphical representation of a direct ink writing 3D-printing process…”

Section: 3d Bioprinting Techniquesmentioning

confidence: 99%

3D Printing in Regenerative Medicine: Technologies and Resources Utilized

Kantaros

2022

IJMS

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Over the past ten years, the use of additive manufacturing techniques, also known as “3D printing,” has steadily increased in a variety of scientific fields. There are a number of inherent advantages to these fabrication methods over conventional manufacturing due to the way that they work, which is based on the layer-by-layer material-deposition principle. These benefits include the accurate attribution of complex, pre-designed shapes, as well as the use of a variety of innovative raw materials. Its main advantage is the ability to fabricate custom shapes with an interior lattice network connecting them and a porous surface that traditional manufacturing techniques cannot adequately attribute. Such structures are being used for direct implantation into the human body in the biomedical field in areas such as bio-printing, where this potential is being heavily utilized. The fabricated items must be made of biomaterials with the proper mechanical properties, as well as biomaterials that exhibit characteristics such as biocompatibility, bioresorbability, and biodegradability, in order to meet the strict requirements that such procedures impose. The most significant biomaterials used in these techniques are listed in this work, but their advantages and disadvantages are also discussed in relation to the aforementioned properties that are crucial to their use.

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“…The TGF-β1 embedded in nanospheres can keep a sustained release for up to 21 days and improve the chondrogenic differentiation of encapsulated MSCs. Therefore, such materials feature high potential in cartilage regeneration processes (Martinez-Garcia et al, 2022;Jiang et al, 2022).…”

Section: Pegda and Gelma Inksmentioning

confidence: 99%

Bio-Inspired Materials: Exhibited Characteristics and Integration Degree in Bio-Printing Operations

Kantaros¹

2022

American Journal of Engineering and Applied Sciences

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In the last decade, additive manufacturing techniques, commonly known under the term "3d printing" have seen constantly increasing use in various scientific fields. The nature of these fabrication techniques that operate under a layer-by-layer material deposition principle features several de facto advantages, compared to traditional manufacturing techniques. These advantages range from the precise attribution of pre-designed complex shapes to the use of a variety of materials as raw materials in the process. However, its major strong point is the ability to fabricate custom shapes with interconnected lattices, and porous interiors that traditional manufacturing techniques cannot properly attribute. This potential is being largely exploited in the biomedical field in sectors like bio-printing, where such structures are being used for direct implantation into the human body. To meet the strict requirements that such procedures dictate, the fabricated items need to be made out of biomaterials exhibiting properties like biocompatibility, bioresorbability, biodegradability, and appropriate mechanical properties. This review aims not only to list the most important biomaterials used in these techniques but also to bring up their pros and cons in meeting the aforementioned characteristics that are vital in their use.

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Effects of Fumed Silica on Thixotropic Behavior and Processing Window by UV-Assisted Direct Ink Writing

Cited by 10 publications

References 33 publications

Shelf-Stable Bingham Plastic Polyurethane Thermosets for Additive Manufacturing

Shelf-Stable Bingham Plastic Polyurethane Thermosets for Additive Manufacturing

3D Printing in Regenerative Medicine: Technologies and Resources Utilized

Bio-Inspired Materials: Exhibited Characteristics and Integration Degree in Bio-Printing Operations

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