Bibliographies thématiques / 3D printing, photopolymer, DLP

Littérature scientifique sur le sujet « 3D printing, photopolymer, DLP »

Auteur : Grafiati
Publié le 14 mars 2023

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Articles de revues sur le sujet "3D printing, photopolymer, DLP"

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Kim, Seul Gi, Ji Eun Song et Hye Rim Kim. « Development of fabrics by digital light processing three-dimensional printing technology and using a polyurethane acrylate photopolymer ». Textile Research Journal 90, no 7-8 (22 octobre 2019) : 847–56. http://dx.doi.org/10.1177/0040517519881821.

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This study aimed to produce fabrics by the digital light processing (DLP) three-dimensional (3D) printing technology and using a polyurethane acrylate photopolymer as the printing material. The effect of the acrylate oligomer concentration on printing was evaluated. The DLP 3D printing conditions, such as the curing time and layer thickness, were controlled considering the physical properties, such as the tensile strength, elongation, and crease recovery of the 3D printed material. The optimal printing conditions were as follows: concentration of acrylate oligomer in the photopolymer: 10% (v/v); curing time per layer: 14 s; and layer thickness: 100 µm. These results are expected to guide further studies on the development of fabrics using DLP 3D printing technology.
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Mau, Robert, Thomas Reske, Thomas Eickner, Niels Grabow et Hermann Seitz. « DLP 3D printing of Dexamethasoneincorporated PEGDA-based photopolymers : compressive properties and drug release ». Current Directions in Biomedical Engineering 6, no 3 (1 septembre 2020) : 406–9. http://dx.doi.org/10.1515/cdbme-2020-3105.

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AbstractPhotopolymerizing, high-resolution 3D printing methods such as Stereolithography (SLA) or Digital Light Processing (DLP) are very promising for the manufacturing of drug-incorporated, patient specific implants. However, a drug-load may be limited by adequately solubility of the active pharmaceutical ingredient (API) in the photopolymer. Furthermore, a drug-load may affect the mechanical properties of the material negatively. Here, we investigate the DLP 3D printing of drugincorporated photopolymers. Polyethylene glycol diacrylate (PEGDA, Mn = 700 g/mol) is used as matrix polymer and Dexamethasone (DEX) is used for drug-loading (10 g/L and 20 g/L). Compressive properties, drug release and drug stability of 3D printed test samples were analyzed. DEX was found to be sparingly soluble in the PEGDA-based photopolymer. Not all drug particles can be dissolved at a concentration of 20 g/L and a slurry-like suspension is formed. Drug-incorporated photopolymers of 10 g/L (solution) and 20 g/L (suspension) were processed successfully via DLP. The higher the drug-load, the lower the compressive strength. Mechanical properties can be improved via a post-curing in a UV light curing box. Drug-incorporated 3D printed test samples show burst-release of DEX. The post-curing process does not affect drug release. DEX degrades in 3D-printed test samples significantly (~ 30 %) over a several days time period.
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Ertugrul, Ishak. « The Fabrication of Micro Beam from Photopolymer by Digital Light Processing 3D Printing Technology ». Micromachines 11, no 5 (20 mai 2020) : 518. http://dx.doi.org/10.3390/mi11050518.

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3D printing has lately received considerable critical attention for the fast fabrication of 3D structures to be utilized in various industrial applications. This study aimed to fabricate a micro beam with digital light processing (DLP) based 3D printing technology. Compound technology and essential coefficients of the 3D printing operation were applied. To observe the success of the DLP method, it was compared with another fabrication method, called projection micro-stereolithography (PμSL). Evaluation experiments showed that the 3D printer could print materials with smaller than 86.7 µm dimension properties. The micro beam that moves in one direction (y-axis) was designed using the determined criteria. Though the same design was used for the DLP and PμSL methods, the supporting structures were not manufactured with PμSL. The micro beam was fabricated by removing the supports from the original design in PμSL. Though 3 μm diameter supports could be produced with the DLP, it was not possible to fabricate them with PμSL. Besides, DLP was found to be better than PμSL for the fabrication of complex, non-symmetric support structures. The presented results in this study demonstrate the efficiency of 3D printing technology and the simplicity of manufacturing a micro beam using the DLP method with speed and high sensitivity.
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Tzeng, Jy-Jiunn, Tzu-Sen Yang, Wei-Fang Lee, Hsuan Chen et Hung-Ming Chang. « Mechanical Properties and Biocompatibility of Urethane Acrylate-Based 3D-Printed Denture Base Resin ». Polymers 13, no 5 (8 mars 2021) : 822. http://dx.doi.org/10.3390/polym13050822.

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In this study, five urethane acrylates (UAs), namely aliphatic urethane hexa-acrylate (87A), aromatic urethane hexa-acrylate (88A), aliphatic UA (588), aliphatic urethane triacrylate diluted in 15% HDD (594), and high-functional aliphatic UA (5812), were selected to formulate five UA-based photopolymer resins for digital light processing (DLP)-based 3D printing. Each UA (40 wt%) was added and blended homogenously with ethoxylated pentaerythritol tetraacrylate (40 wt%), isobornyl acrylate (12 wt%), diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide (3 wt%), and a pink acrylic (5 wt%). Each UA-based resin specimen was designed using CAD software and fabricated using a DLP 3D printer to specific dimensions. Characteristics, mechanical properties, and cytotoxicity levels of these designed UA-based resins were investigated and compared with a commercial 3D printing denture base acrylic resin (BB base) control group at different UV exposure times. Shore hardness-measurement data and MTT assays were analyzed using a one-way analysis of variance with Bonferroni’s post hoc test, whereas viscosity, maximum strength, and modulus were analyzed using the Kruskal–Wallis test (α = 0.05). UA-based photopolymer resins with tunable mechanical properties were successfully prepared by replacing the UA materials and the UV exposure times. After 15 min of UV exposure, the 5812 and 594 groups exhibited higher viscosities, whereas the 88A and 87A groups exhibited lower viscosities compared with the BB base group. Maximum flexural strength, flexural modulus, and Shore hardness values also revealed significant differences among materials (p < 0.001). Based on MTT assay results, the UA-based photopolymer resins were nontoxic. In the present study, mechanical properties of the designed photopolymer resins could be adjusted by changing the UA or UV exposure time, suggesting that aliphatic urethane acrylate has good potential for use in the design of printable resins for DLP-type 3D printing in dental applications.
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Bae, Sang-U., et Birm-June Kim. « Effects of Cellulose Nanocrystal and Inorganic Nanofillers on the Morphological and Mechanical Properties of Digital Light Processing (DLP) 3D-Printed Photopolymer Composites ». Applied Sciences 11, no 15 (25 juillet 2021) : 6835. http://dx.doi.org/10.3390/app11156835.

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Photopolymer composites filled with cellulose nanocrystal (CNC) and/or inorganic nanofillers were fabricated by using digital light processing (DLP) 3D printing. To investigate the effects of different CNC lyophilization concentrations and behaviors of CNC particles in the photopolymer composites, morphological and mechanical properties were analyzed. CNC loading levels affected the morphological and mechanical properties of the filled composites. Better CNC dispersion was seen at a lower lyophilization concentration, and the highest mechanical strength was observed in the 0.25 wt% CNC-filled composite. Furthermore, nano-precipitated calcium carbonate (nano-PCC) and nanoclay were added to photocurable resins, and then the effect of inorganic nanofillers on the morphological and mechanical properties of the composites were evaluated. By analyzing the morphological properties, the stress transfer mechanism of nano-PCC and nanoclay in the photopolymer composites was identified and related models were presented. These supported the improved mechanical strength of the composites filled with CNC, nano-PCC, and nanoclay. This study suggested a new approach using wood-derived cellulose nanomaterials and inorganic nanofillers as effective fillers for DLP 3D printing.
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Wang, Chong, Chen Wang et Zhiquan Li. « Thiol-ene-acrylate Ternary Photosensitive Resins for DLP 3D Printing ». Journal of Photopolymer Science and Technology 33, no 3 (1 juillet 2020) : 285–90. http://dx.doi.org/10.2494/photopolymer.33.285.

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Mamayeva, Aksaule A., Akerke T. Imbarova et Marzhan T. Chukmanova. « Investigation of Temperature Deformations and Burning of Models from Polymers ». Solid State Phenomena 316 (avril 2021) : 40–45. http://dx.doi.org/10.4028/www.scientific.net/ssp.316.40.

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The usage of 3D printing technology SLA and DLP is promising for obtaining casting models. The article presents the results of a study of temperature deformations, developing during the burning of models from polymers “Fun to Do Castable Blend”, “Oh-All! Red” and “Orange Fluor”. In the performance of the experiments, photopolymer models were exposed to an impact of isothermal at temperatures from 50 to 330 °C, and their linear dimensions measured; changes developing on their surface were noted. It is shown that, with an increase of the isothermal holding temperature, the models expand first and narrow later. It has been linked to temperature expansion and subsequent decomposition of the photopolymer. It is shown that the casting molds ,obtained with the usied thin-walled hollow casting models from these photopolymers, are destroyed at the stage of their burning.
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Verisqa, Fiona, Jae-Ryung Cha, Linh Nguyen, Hae-Won Kim et Jonathan C. Knowles. « Digital Light Processing 3D Printing of Gyroid Scaffold with Isosorbide-Based Photopolymer for Bone Tissue Engineering ». Biomolecules 12, no 11 (15 novembre 2022) : 1692. http://dx.doi.org/10.3390/biom12111692.

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As one of the most transplanted tissues of the human body, bone has varying architectures, depending on its anatomical location. Therefore, bone defects ideally require bone substitutes with a similar structure and adequate strength comparable to native bones. Light-based three-dimensional (3D) printing methods allow the fabrication of biomimetic scaffolds with high resolution and mechanical properties that exceed the result of commonly used extrusion-based printing. Digital light processing (DLP) is known for its faster and more accurate printing than other 3D printing approaches. However, the development of biocompatible resins for light-based 3D printing is not as rapid as that of bio-inks for extrusion-based printing. In this study, we developed CSMA-2, a photopolymer based on Isosorbide, a renewable sugar derivative monomer. The CSMA-2 showed suitable rheological properties for DLP printing. Gyroid scaffolds with high resolution were successfully printed. The 3D-printed scaffolds also had a compressive modulus within the range of a human cancellous bone modulus. Human adipose-derived stem cells remained viable for up to 21 days of incubation on the scaffolds. A calcium deposition from the cells was also found on the scaffolds. The stem cells expressed osteogenic markers such as RUNX2, OCN, and OPN. These results indicated that the scaffolds supported the osteogenic differentiation of the progenitor cells. In summary, CSMA-2 is a promising material for 3D printing techniques with high resolution that allow the fabrication of complex biomimetic scaffolds for bone regeneration.
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Mitkus, Rytis, Marlitt Scharnofske et Michael Sinapius. « Characterization 0.1 wt.% Nanomaterial/Photopolymer Composites with Poor Nanomaterial Dispersion : Viscosity, Cure Depth and Dielectric Properties ». Polymers 13, no 22 (15 novembre 2021) : 3948. http://dx.doi.org/10.3390/polym13223948.

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Notably, 3D printing techniques such as digital light processing (DLP) have the potential for the cost-effective and flexible production of polymer-based piezoelectric composites. To improve their properties, conductive nanomaterials can be added to the photopolymer to increase their dielectric properties. In this study, the microstructure, viscosity, cure depth, and dielectric properties of ultraviolet (UV) light curable 0.1 wt.% nanomaterial/photopolymer composites are investigated. The composites with multi-walled carbon nanotubes (MWCNTs), graphene nanoplatelets (GNPs), and carbon black (CB) are pre-dispersed in different solvents (acetone, isopropyl alcohol, and ethanol) before adding photopolymer and continuing dispersion. For all prepared suspensions, a reduction in viscosity is observed, which is favorable for 3D printing. In contrast, the addition of 0.1 wt.% nanomaterials, even with poor dispersion, leads to curing depth reduction up to 90% compared to pristine photopolymer, where the nanomaterial dispersion is identified as a contributing factor. The formulation of MWCNTs dispersed in ethanol is found to be the most promising for increasing the dielectric properties. The post-curing of all composites leads to charge immobility, resulting in decreased relative permittivity.
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Han, Hoseong, et Sunghun Cho. « Fabrication of Conducting Polyacrylate Resin Solution with Polyaniline Nanofiber and Graphene for Conductive 3D Printing Application ». Polymers 10, no 9 (8 septembre 2018) : 1003. http://dx.doi.org/10.3390/polym10091003.

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Three-dimensional printing based on the digital light processing (DLP) method offers solution processability, fast printing time, and high-quality printing through selective light curing of photopolymers. This research relates to a method of dispersing polyaniline nanofibers (PANI NFs) and graphene sheets in a polyacrylate resin solution for optimizing the conductive solution suitable for DLP-type 3D printing. Dispersion and morphology of the samples with different filler contents were investigated by field emission scanning electron microscope (FE-SEM) and optical microscope (OM) analyses. The polyacrylate composite solution employing the PANI NFs and graphene was printed well with various shapes and sizes through the 3D printing of DLP technology. In addition, the electrical properties of the printed sculptures have been investigated using a 4-point probe measurement system. The printed sculpture containing the PANI NFs and graphene sheets exhibited electrical conductivity (4.00 × 10−9 S/cm) up to 107 times higher than the pure polyacrylate (1.1 × 10−16 S/cm). This work suggests potential application of the PANI NF/graphene cofiller system for DLP-type 3D printing.
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Thèses sur le sujet "3D printing, photopolymer, DLP"

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Elliott, Amelia M. « The Effects of Quantum Dot Nanoparticles on Polyjet Direct 3D Printing Process ». Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/46632.

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Additive Manufacturing (AM) is a unique method of fabrication that, in contrast to traditional manufacturing methods, builds objects layer by layer. The ability of AM (when partnered with 3D scanning) to clone physical objects has raised concerns in the area of intellectual property (IP). To address this issue, the goal of this dissertation is to characterize and model a method to incorporate unique security features within AM builds. By adding optically detectable nanoparticles into transparent AM media, Physical Unclonable Function (PUFs) can be embedded into AM builds and serve as an anti-counterfeiting measure. The nanoparticle selected for this work is a Quantum Dot (QD), which absorbs UV light and emits light in the visible spectrum. This unique interaction with light makes the QDs ideal for a security system since the challenge (UV light) is a different signal from the response (the visible light emitted by the QDs). PolyJet, the AM process selected for this work, utilizes inkjet to deposit a photopolymer into layers, which are then cured with a UV light. An investigation into the visibility of the QDs within the printed PolyJet media revealed that the QDs produce PUF patterns visible via fluorescent microscopy. Furthermore, rheological data shows that the ink-jetting properties of the printing media are not significantly affected by QDs in sufficient concentrations to produce PUFs. The final objective of this study is to characterize the effects of the QDs on photocuring. The mathematical model to predict the critical exposure of the QD-doped photopolymer utilizes light scattering theory, QD characterization results, and photopolymer-curing characterization results. This mathematical representation will contribute toward the body of knowledge in the area of Additive Manufacturing of nanomaterials in photopolymers. Overall, this work embodies the first investigations of the effects of QDs on rheological characteristics of ink-jetted media, the effects of QDs on curing of AM photopolymer media, visibility of nanoparticles within printed AM media, and the first attempt to incorporate security features within AM builds. Finally, the major scientific contribution of this work is the theoretical model developed to predict the effects of QDs on the curing properties of AM photopolymers.
Ph. D.
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Sun, Mingze. « Digital Light Processing 3D Printing of Reconfigurable Reprintable Ion-crosslinked Shape Memory Polymer ». University of Akron / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=akron1629912593189792.

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Meem, Asma Ul Hosna. « On the Mechanics and Dynamics of Soft UV-cured Materials with Extreme Stretchability for DLP Additive Manufacturing ». University of Dayton / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1628358191573142.

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Huang, Pin-Ju, et 黃品儒. « 3D Printing Polycaprolactone/Hydroxyapatite Composite Scaffold using Digital Light Projection (DLP) Technique ». Thesis, 2017. http://ndltd.ncl.edu.tw/handle/ffw5x5.

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碩士
國立陽明大學
牙醫學系
105
The technique using three-dimensional printing to manufacture tissue scaffolds has been gaining popularity for the past few years. Polycaprolactone (PCL) is an appropriate material for this kind of additive manufacturing due to its low melting point at low molecular weight. Besides, its biodegradable and biocompatible properties make it widely used in tissue engineering. In view of this, the aim of our study is to use the synthesized PCL triacrylate to fabricate the customized tissue engineering scaffold applying the innovative DLP 3D printing technique. We synthesized a three functional groups PCL named Glycerol-3/6Caprolactone-Triacrylate. Glycerol was the starting reactant for its three hydroxyl groups that can undergo ring-opening polymerization with ε-CL monomer. Then, three or six equivalents of ε-CL monomer was added as main reactant. In the end, PCL was modified by acrylate groups that could enable it to be photopolymerized. In the 3D printing part of our study, hydroxyapatite (HA) was added to reinforce the strength of our PCL, and moreover, it could help us control the resolution of scaffold pore size. We chose 2,4,6-Trimethylbenzoyl-diphenyl-phosphineoxide (TPO) as the photoinitiator because its reactive wavelength was around 405nm that met the requirement of our DLP 3D printing machine. Characterization of chemical and mechanical properties of PCL triacrylate were done. And the printing resolution of the scaffold was observed by SEM. Cytotoxicity test was done using L929 cells.
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Chen, Zhen-You, et 陳貞佑. « Study on Failure Factors of Bottom-up DLP High Speed 3D Printing ». Thesis, 2019. http://ndltd.ncl.edu.tw/handle/32e243.

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碩士
國立臺灣科技大學
機械工程系
107
In the bottom-up mask projection stereolithography technique, the problem of separation force has been in-depth discussion because it greatly affects the printing speed and limits the design of the size and features of printed objects. Until Carbon 3D developed CLIP technology in 2015, it solved the separation force problem, also achieved the concept of continuous printing. This study will use inhibition of radical polymerization and apply to bottom-up DLP system, but we found some defects on the cross-section of the printed object, which led to the failure of printing. Therefore, the purpose of this study is to study on the factors of printing failure during printing process, and improve the quality of printed product in the high speed 3D printing. In this study, we analyze the failure factors of inhibitor consumption and resin polymerization rate and found the curing depth of resin after printing was affected. The reason is low activity free radicals produced by inhibitor which affect the resin polymerization rate. In addition, if the resin is added with excessive photoinitiator, a large amount of free radicals will be generated, which will affect the thickness of the dead zone and cause printing failure, and different photoinitiator concentration should be match with appropriate inhibitor concentration. Also, the amount of low activity free radicals is balanced with the amount carried away by the polymer to solve the effect of the resin and improve the quality of the printed product.
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Chen, Hsuan, et 陳翾. « Synthesis of PCL-base Polyurethane Prepolymer for DLP 3D Printing of Tissue Engineering Scaffold ». Thesis, 2018. http://ndltd.ncl.edu.tw/handle/9cn9en.

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Chen, Yuan-Ming, et 陳元明. « Introducing 3D scanning and DLP 3D printing for glasses design customization - A case study of male plastic frame design ». Thesis, 2017. http://ndltd.ncl.edu.tw/handle/cf6wja.

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碩士
義守大學
工業管理學系
105
Recently, the trend of "fast fashion" emphasizing fast, cheap without losing the popularity has enlarged the eyewear market of glasses industry. Except for a few hit products, small quantities but large varieties of common product sales reflect the needs of individual consumers within the long tail market. Traditional eyewear purchase is a time consuming process, including optometry check, glass frame pair-up, and the adjustment of frame to suite the face and ear after the lens are shaped. Most glass shops can not meet the needs of consumers on the style and size due to limited space inventory. It is not possible to provide customization services according to personal face shape and physical geometries. There is a clear goal for the industry to reduce the time for paring-up, yet accurate and capable of customization. As the advancement of rapid prototyping technologies, many commodities now are fabricated quickly and accurately with 3D printers. This movement not only reduce the cost of molding and tooling but also realize designer''s creativity immediately. This study initially utilized 3D scanning to create 3D model of user faces and then capture critical dimensions required for the glass frame design. Accordingly, the designer selected proper modular components of the glass frame for matching these critical dimensions. Afterwards, a DLP 3D was utilized to print out these components, which highly precise for assembling and wearing. Through actual results of user wearing and tests. This research has proved that 3D scanning can accurately recommend a set of frame with suitable sizes, providing comfortable wearing experience for consumers. Particularly, two critical dimensions the "nose pad distance" and "frame leg length," proposed by the 3D scanning have revealed better performance than the glass frames of user self-selection. In addition to increasing the ergonomic aspects, this study has introduced DLP light curing 3D printing technology to print out glass frame. This has prevent the shortcomings of surface roughness created by normal FDM 3D printer. The fabricated parts also provided strength and flexibility for actual wearing with affordable cost. This research has proposed a new utilization of 3d printing to replace traditional injection-mold manufacturing, which can reduce mold and tooling cost and eventually enlarge the revenue of glass industry through custom-fit design.
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« Investigating The Performance Of 3-D Printed Sorbents For Direct Air Capture Of CO2 ». Master's thesis, 2020. http://hdl.handle.net/2286/R.I.57325.

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abstract: In this study, the stereolithography (SLA) 3D printing method is used to manufacture honeycomb-shaped flat sorbents that can capture CO2 from the air. The 3D-printed sorbents were synthesized using polyvinyl alcohol (PVA), propylene glycol, photopolymer resin, and an ion exchange resin (IER). The one-factor-at-a-time (OFAT) design-of-experiment approach was employed to determine the best combination ratio of materials to achieve high moisture swing and a good turnout of printed sorbents. The maximum load limit of the liquid photopolymer resin to enable printability of sorbents was found to be 44%. A series of moisture swing experiments was conducted to investigate the adsorption and desorption performance of the 3D-printed sorbents and compare them with the performance of IER samples prepared by a conventional approach. Results from these experiments conducted indicate that the printed sorbents showed less CO2 adsorptive characteristics compared to the conventional IER sample. It is proposed for future research that a liquid photopolymer resin made up of an IER be synthesized in order to improve the CO2-capturing ability of manufactured sorbents.
Dissertation/Thesis
Masters Thesis Mechanical Engineering 2020
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Chapitres de livres sur le sujet "3D printing, photopolymer, DLP"

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Yogesh, Patil, Patil Richa, N. S. Chandrashekhar et K. P. Karunakaran. « Layer Separation Mechanisms in DLP 3D Printing ». Dans Lecture Notes on Multidisciplinary Industrial Engineering, 179–87. Singapore : Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9433-2_15.

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Actes de conférences sur le sujet "3D printing, photopolymer, DLP"

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Mitkus, Rytis, Andreas Pierou, Julia Feder et Michael Sinapius. « Investigation and Attempt to 3D Print Piezoelectric 0-3 Composites Made of Photopolymer Resins and PZT ». Dans ASME 2020 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/smasis2020-2287.

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Abstract The present study demonstrates the manufacturing and characterization of 0-3 piezoelectric composites made of up to 10 vol% of Lead Zirconate Titanate (PZT) particles and photopolymer resins. The tape-casting method was used to investigate the curing behavior, PZT loading limitations and the overall feasibility of the suspensions for 3D printing. Piezoelectric composites were 3D printed with a commercial DLP type 3D printer. As a starting point, the maximum possible vol% loading of PZT ceramic for each photopolymer resin was investigated. Five different commercially available photopolymer resins from Formlabs (Somerville, MA, US) were used. It was found that the addition of PZT particles to the photopolymer increases the time required for the photopolymer to solidify because PZT particles scatter the UV light. The approximate solidification time of each composition was measured, followed by viscosity measurements. SEM imaging of the composites showed good particle dispersion with minimum agglomeration, low particle sedimentation, but the weak bond between PZT particles and the photopolymers. Best performed material composition with 10 vol% of PZT was used for 3D printing. An attempt to shorten exposure time during printing was done by adding photoinitiator TPO. Suspensions with and without TPO were 3D printed and compared.
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Billings, Christopher, Changjie Cai et Yingtao Liu. « Investigation of 3D Printed Antibacterial Nanocomposites for Improved Public Health ». Dans ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-72092.

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Abstract Bacterial infections have been recognized as a critical challenge to public health, resulting in substantial morbidity, mortality, and enormous costs. In this paper, a digital light processing (DLP) based 3D printing system is employed to rapidly manufacture photocurable thermoset polymers and nanocomposites for potential antibacterial applications. This work shows how nanoparticles that present antibacterial properties can be added to traditional DLP manufacturing and their effects on the physical properties. In this paper, titanium dioxide (TiO2) and zinc oxide (ZnO) nanoparticles in the 10 to 30-nm range are mixed with photocurable resins for rapid 3D printing and prototyping. The two resins used are a standard photopolymer rapid resin and an ABS-like photopolymer rapid resin. A 1% composite percentage is utilized to avoid the requirement of modification to the printing system due to greatly increased viscosity. Tensile testing data, contact angle data, and abrasion data are performed on a total of four different composites and two controls. These composites have shown a tensile strength of 29.53 MPa. At the 1% nanoparticle weight concentration, the 3D printing nanocomposites are transparent and demonstrate a complete penetration of particles throughout the entire print. The detailed experimental characterization will be conducted to understand the 3D printed material’s mechanical properties and microstructures fully. This research can enhance public health by providing a novel approach to control the spread of bacteria and other microbial.
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AUSTINE, EKUASE OKUNZUWA, FAREED DAWAN et PATRICK MENSAH. « Thermo-Mechanical Characterization of a Hybrid Reinforced Photopolymer Composite via DLP 3D Printing ». Dans American Society for Composites 2020. Lancaster, PA : DEStech Publications, Inc., 2020. http://dx.doi.org/10.12783/asc35/34915.

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Mitkus, Rytis, Ayat Taleb Alashkar et Michael Sinapius. « An Attempt to Topology Optimize 3D Printed Piezoelectric Composite Sensors for Highest D31 Output ». Dans ASME 2021 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/smasis2021-68029.

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Abstract By adopting topology optimization based on numerical solvers, the geometries of the piezoelectric sensors can be optimized to produce higher electrical output in a certain loading directions. 2D topology optimization and simulation studies are carried out with ANSYS using Piezo and MEMS extensions for coupled systems. Topology optimization is based on Solid isotropic material with the penalization method, where the design variables are the pseudo densities that control material distribution at each finite element. The optimization problem is solved using Sequential Convex Programming. The approximation of the objective function happens through a uniform convex function. The objective is to reduce the fundamental frequency of the piezoelectric sensor for given constraints and boundary conditions (maximum sensor size of 30 × 30 mm and reduction of sensor mass by 50%). Two optimized shapes are chosen for further analysis. All sensors are made of 10 vol% PZT piezoelectric ceramic in High-Temperature V2 photopolymer resin. Sensors are manufactured using a simulated Direct Light Processing (DLP) type 3D printing process by tape-casting them on glass and exposing them to UV light. The performance of sensors is measured on a 4-point bending setup. Experiments show the enhanced performance of the optimized sensors even when their mass is reduced by 50%.
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Wu, Chenming, Ran Yi, Yong-Jin Liu, Ying He et Charlie C. L. Wang. « Delta DLP 3D printing with large size ». Dans 2016 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS). IEEE, 2016. http://dx.doi.org/10.1109/iros.2016.7759338.

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Mostafa, Khaled, A. J. Qureshi et Carlo Montemagno. « Tolerance Control Using Subvoxel Gray-Scale DLP 3D Printing ». Dans ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-72232.

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3D printing manufacturing technology has been utilized in various applications due to its promising manufacturing advantages. Desktop Digital Light Processing (DLP) printers provide high-resolution products with a moderate price range. DLP uses an array of micromirrors to transmit UV light from the light projector in order to perform selective curing of a prepolymer resin and turn it in to the required geometry. The CAD file is transformed into several slices according to the layer thickness. Each slice is then converted to an image of black and white pixels, in which each white pixel actuates a corresponding micromirror to transmit the UV light to cure a corresponding voxel, while a black pixel corresponds to no actuation, which means no curing for the corresponding voxel. The micromirror’s size determines the resolution of the printer. Although a theoretical voxel size can be determined as a function of the micromirror’s dimensions and layer thickness, the actual voxel volume depends on several parameters such as the layer thickness, UV exposure time, and UV exposure intensity. Controlling these three parameters would result in more accurate 3D printed parts and more control over the dimensional tolerance. In this paper, the effect of variable light intensity in terms of grayscale pixels is studied along with the exposure time and layer thickness to manipulate the voxel horizontal dimensions. This enables printing with voxel dimensions below the size of the micromirrors in the DLP, which improve the geometric dimensioning and tolerance of the printed parts.
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Siwach, Gaurav, et Rahul Rai. « Conformal 3D Printing of Sensors ». Dans ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-46089.

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A sensor is unobtrusive if it doesn’t interfere with the design, mechanical properties, and the functionality of the structure it is integrated with. This paper discusses the development of unobtrusive piezo-resistive sensors and their production using additive manufacturing. Short carbon fibers were dispersed in an acrylate resin and subsequently cured with UV DLP 3D printer to be used as a strain-sensing device. Varying the amount of carbon fiber resulted in resistivity variation of the composite. The composite was found to be piezo-resistive, and gauze factor at a concentration of 12% carbon fiber by volume was obtained through mechanical load testing.
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Liu, Zechao, Yandong Li, Lifang Wu, Kejian Cui, Jianhua Yan et Hui Yu. « Model guided DLP 3D printing for solid and hollow structure ». Dans 2021 14th International Conference on Human System Interaction (HSI). IEEE, 2021. http://dx.doi.org/10.1109/hsi52170.2021.9538633.

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Raines, Regan, et Roozbeh (Ross) Salary. « Investigation of the Effects of Photopolymer Resin Composition on the Mechanical Properties of Complex Dental Constructs, Fabricated Using Digital Light Processing ». Dans ASME 2022 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/imece2022-95049.

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Abstract The overarching goal of this research work is to fabricate mechanically robust, dimensionally accurate, and porous dental structures, potentially used for the treatment of dental fractures, anomalies, as well as structural deformities with a focus on oral and maxillofacial surgery applications. In pursuit of this goal, the objective of the work is to investigate the mechanical properties of dental constructs, composed of medical-grade photopolymer resins and fabricated using digital light processing (DLP) process. The fabricated dental constructs not only are porous, but also have complex microstructures imparted by triply periodic minimal surface (TPMS) designs. This study tests the following central hypothesis: the mechanical properties of DLP-fabricated dental structures are significantly affected by photopolymer resin composition. In addition, the following research question is answered in this study: which of the chosen medical-grade photopolymer resins has the most significant impact on the mechanical properties of fabricated dental structures. DLP is a vat-photopolymerization additive manufacturing process, which has emerged as a high-resolution, robust method for the fabrication of a broad range of biological tissues and constructs for oral and dental tissue engineering applications. In the DLP process, the printing process takes place on the basis of radiation-curable resins or liquid photopolymers. Upon exposure to UV light, the resin materials become a solid (via chemical transformation) through a process known as photopolymerization. The DLP process consists of several parameters (such as layer thickness, cure depth, and UV lamp intensity) that significantly influence the functional properties of fabricated dental structures. In spite of the advantages and engendered applications, DLP is inherently complex; the complexity of the DLP process, to a great extent, stems from complex physio-chemical phenomena (such as UV light photopolymerization) in addition to resin (photopolymer)-process interactions, which may adversely affect not only the surface morphology, but also the mechanical properties and ultimately the functional characteristics of the fabricated dental scaffolds. As a result, integrated physics-guided process and material characterization would be required for optimal fabrication of porous and complex dental structures. Particularly in this study, the influence of three medical-grade photopolymer resins on the compression properties as well as the dimensional accuracy of TPMS dental constructs is systematically investigated. The compression properties of the DLP-fabricated dental constructs are measured using a compression testing machine. Furthermore, the dimensional accuracy of the dental constructs is measured via physical measurements and with the aid of a laser scanner. Besides, analysis of variance (ANOVA) is utilized to identify statistically significant photopolymer resin(s). The outcomes of this study pave the way for high-resolution fabrication of complex and porous dental structures with tunable medical and functional properties.
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Wang, Haohuan, Zhengyong Huang, Jian Li et Licheng Li. « DLP 3D Printing of High-Performance Epoxy Resin Via Dual Curing ». Dans 2021 3rd International Academic Exchange Conference on Science and Technology Innovation (IAECST). IEEE, 2021. http://dx.doi.org/10.1109/iaecst54258.2021.9695694.

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Rapports d'organisations sur le sujet "3D printing, photopolymer, DLP"

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Ovalle, Samuel, E. Viamontes et Tony Thomas. Optimization of DLP 3D Printed Ceramic Parts. Florida International University, octobre 2021. http://dx.doi.org/10.25148/mmeurs.009776.

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Digital Light Processing (DLP) 3D printing allows for the creation of parts with advanced engineering materials and geometries difficult to produce through conventional manufacturing techniques. Photosensitive resin monomers are activated with a UV-producing LCD screen to polymerize, layer by layer, forming the desired part. With the right mixture of photosensitive resin and advanced engineering powder material, useful engineering-grade parts can be produced. The Bison 1000 is a research-grade DLP printer that permits the user to change many parameters, in order to discover an optimal method for producing 3D parts of any material of interest. In this presentation, the process parameter optimization and their influence on the 3D printed parts through DLP technique will be discussed. The presentation is focused on developing 3D printable slurry, printing of complex ceramic lattice structures, as well as post heat treatment of these DLP-produced parts.
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