Selective Laser Sintering of Porous Silica Enabled by Carbon Additive

Chang, Shuai; Li, Liqun; Li, Lu; Fuh, J.Y.H.

doi:10.20944/preprints201710.0003.v1

Cited by 8 publications

(4 citation statements)

References 16 publications

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“…Although the low near-infrared laser absorptivity of oxide ceramics, the direct SLS of ceramics throughout powder coating adds to the low melting point or composites ceramics has been done [ 58 ]. Many sacrificial binders as waxes, thermoplastics, long-chain fatty acids or sometimes a combination of binders as thermoset/semi-crystalline PA-11 or wax/PMMA are used for the realization of porous 3D structured materials as graphite and composite ceramic Al 2 O 3 -ZrO 2 -TiC [ 59 , 60 , 61 ]. A high-energy laser beam increasing the temperature on the surface promotes the particle interaction to each other before sintering together, while the material on the grain borderline continues to diffuse into the pores, stimulating densification activities.…”

Section: 3d Printed (3dp) Mesoporous Scaffolds Fabrication Techniqmentioning

confidence: 99%

Drug Delivery Applications of Three-Dimensional Printed (3DP) Mesoporous Scaffolds

et al. 2020

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Mesoporous materials are structures characterized by a well-ordered large pore system with uniform porous dimensions ranging between 2 and 50 nm. Typical samples are zeolite, carbon molecular sieves, porous metal oxides, organic and inorganic porous hybrid and pillared materials, silica clathrate and clathrate hydrates compounds. Improvement in biochemistry and materials science led to the design and implementation of different types of porous materials ranging from rigid to soft two-dimensional (2D) and three-dimensional (3D) skeletons. The present review focuses on the use of three-dimensional printed (3DP) mesoporous scaffolds suitable for a wide range of drug delivery applications, due to their intrinsic high surface area and high pore volume. In the first part, the importance of the porosity of materials employed for drug delivery application was discussed focusing on mesoporous materials. At the end of the introduction, hard and soft templating synthesis for the realization of ordered 2D/3D mesostructured porous materials were described. In the second part, 3DP fabrication techniques, including fused deposition modelling, material jetting as inkjet printing, electron beam melting, selective laser sintering, stereolithography and digital light processing, electrospinning, and two-photon polymerization were described. In the last section, through recent bibliographic research, a wide number of 3D printed mesoporous materials, for in vitro and in vivo drug delivery applications, most of which relate to bone cells and tissues, were presented and summarized in a table in which all the technical and bibliographical details were reported. This review highlights, to a very cross-sectional audience, how the interdisciplinarity of certain branches of knowledge, as those of materials science and nano-microfabrication are, represent a growing valuable aid in the advanced forum for the science and technology of pharmaceutics and biopharmaceutics.

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Section: 3d Printed (3dp) Mesoporous Scaffolds Fabrication Techniqmentioning

confidence: 99%

Drug Delivery Applications of Three-Dimensional Printed (3DP) Mesoporous Scaffolds

et al. 2020

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“…Production technologies related to sintering, such as selective laser sintering (SLS) 7,8 and flash sintering, 9,10 have also progressed. SLS offers freedom to design and produce complex electronic components, and thus, it is a key technology for additive manufacturing.…”

Section: Introductionmentioning

confidence: 99%

Distortion prediction during sintering using Monte Carlo method implemented with virtual springs

Matsuda

2022

Int J Ceramic Engine & Sci

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A computational simulation for sintering based on the Monte Carlo (MC) method implemented with a virtual spring was developed to predict the shrinkage and deformation of compacts. Conventional MC models do not sufficiently consider the local strain of the cells. The proposed model considered the local strain using a virtual spring in each cell. The model linked with the finite element method enables direct calculation of the deformation of the powder compacts. The results indicate that the distortion tendency of the simulations agreed with the experimental results of the sintering of Al2O3 powder compacts. Furthermore, the results indicate the potential of the model to predict the stress distribution in a microstructure during sintering.

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“…However, laser-based AM of oxide ceramics implies additional challenges as compared to metals due to their signi cantly higher melting temperature, high viscosity, poor thermal shock resistance and poor absorption of laser light, as it is demonstrated in literature on LPBF of alumina [5][6][7][8][9][10] and zirconia 9,11,12 . The latter challenge can be well mitigated by introducing light absorption additives, such as carbon 6,13,14 , titanium carbide 10,15 or other metal oxides [16][17][18][19] . However, the issue of structural defect formation, such as pores and cracks, which is related to the extreme temperature gradients from high heating and cooling rates combined with low heat conductivity and high Youngs modulus, remains unsolved.…”

Section: Introductionmentioning

confidence: 99%

Operando tomographic microscopy during laser-based powder bed fusion

Makowska

Verga

Pfeiffer

et al. 2022

Preprint

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Laser-based Powder Bed Fusion (LPBF) of oxide ceramics enables fabrication of objects with complex three-dimensional shapes, which are impossible to achieve using conventional manufacturing routes. However, mechanical properties of dense LPBF-manufactured ceramics are very poor due to large amount of structural defects. To acquaint deeper understanding of the underlying mechanisms, operando tomographic microscopy during LPBF of a magnetite-modified alumina using a pulsed, green laser has been carried out. Operando 3-dimensional information provides an insight into phenomena not accessible with other techniques. The effect of the laser energy density on the surface roughness, powder denudation zone and porosity formation mechanisms is investigated. Using increasing power results in significant increase of the melt pool width, but not of its depth and no melt pool depression is observed. For the investigated ceramic system, the forces due to the recoil pressure do not significantly influence the melt pool dynamics. Increasing power leads to avoid the lack of fusion porosity, but enhances formation of spherical porosity that is formed by either reaching boiling point of liquid alumina, or by introducing gas bubbles by injection of hollow powder particles into the liquid.

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Selective Laser Sintering of Porous Silica Enabled by Carbon Additive

Cited by 8 publications

References 16 publications

Drug Delivery Applications of Three-Dimensional Printed (3DP) Mesoporous Scaffolds

Drug Delivery Applications of Three-Dimensional Printed (3DP) Mesoporous Scaffolds

Distortion prediction during sintering using Monte Carlo method implemented with virtual springs

Operando tomographic microscopy during laser-based powder bed fusion

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