Customizable 3D-printed architecture with ZnO-based hierarchical structures for enhanced photocatalytic performance

Nanoscale ◽  
2018 ◽  
Vol 10 (46) ◽  
pp. 21696-21702 ◽  
Author(s):  
Soomin Son ◽  
Pil-Hoon Jung ◽  
Jaemin Park ◽  
Dongwoo Chae ◽  
Daihong Huh ◽  
...  
Keyword(s):  
3D Printing ◽  
Photocatalytic Performance ◽  
Hydrothermal Reaction ◽  
Hierarchical Structures ◽  
Printing Technique ◽  
3D Printed ◽  
3D Printing Technique

ZnO-based hierarchical structures including nanoparticles (NPs), nanorods (NRs), and nanoflowers (NFs) on 3D-printed backbones were effectively fabricated via the combination of FDM 3D-printing technique and hydrothermal reaction.

scholarly journals Freeze-FRESH: A 3D Printing Technique to Produce Biomaterial Scaffolds with Hierarchical Porosity

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 354 ◽  
Author(s):  
Zi Wang ◽  
Stephen J. Florczyk
Keyword(s):  
3D Printing ◽  
Hierarchical Structures ◽  
Pore Wall ◽  
Cell Interaction ◽  
Wall Stiffness ◽  
Printing Technique ◽  
Biomaterial Scaffolds ◽  
3D Printed ◽  
Hierarchical Pore ◽  
3D Printing Technique

Tissues are organized in hierarchical structures comprised of nanoscale, microscale, and macroscale features. Incorporating hierarchical structures into biomaterial scaffolds may enable better resemblance of native tissue structures and improve cell interaction, but it is challenging to produce such scaffolds using a single conventional scaffold production technique. We developed the Freeze-FRESH (FF) technique that combines FRESH 3D printing (3DP) and freeze-casting to produce 3D printed scaffolds with microscale pores in the struts. FF scaffolds were produced by extrusion 3DP using a support bath at room temperature, followed by freezing and lyophilization, then the FF scaffolds were recovered from the bath and crosslinked. The FF scaffolds had a hierarchical pore structure from the combination of microscale pores throughout the scaffold struts and macroscale pores in the printed design, while control scaffolds had only macroscale pores. FF scaffolds frozen at −20 °C and −80 °C had similar pore sizes, due to freezing in the support bath. The −20 °C and −80 °C FF scaffolds had porous struts with 63.55% ± 2.59% and 56.72% ± 13.17% strut porosity, respectively, while control scaffolds had a strut porosity of 3.15% ± 2.20%. The −20 °C and −80 °C FF scaffolds were softer than control scaffolds: they had pore wall stiffness of 0.17 ± 0.06 MPa and 0.23 ± 0.05 MPa, respectively, compared to 1.31 ± 0.39 MPa for the control. The FF scaffolds had increased resilience in bending compared with control. FF scaffolds supported MDA-MB-231 cell growth and had significantly greater cell numbers than control scaffolds. Cells formed clusters on the porous struts of FF scaffolds and had similar morphologies as the freeze cast scaffolds. The FF technique successfully introduced microscale porosity into the 3DP scaffold struts to produce hierarchical pore structures that enhanced MDA-MB-231 growth.

Properties and applications of electrically conductive thermoplastics for additive manufacturing of sensors

2017 ◽  
Vol 84 (9) ◽  
Author(s):  
Benedikt Hampel ◽  
Samuel Monshausen ◽  
Meinhard Schilling
Keyword(s):  
3D Printing ◽  
Fused Deposition Modeling ◽  
Electrical Conductance ◽  
Electrically Conductive ◽  
Fused Deposition ◽  
Printing Technique ◽  
Deposition Modeling ◽  
3D Printed ◽  
3D Printing Technique ◽  
Printing Parameters

AbstractIn consequence of the growing diversity of materials in the fused deposition modeling 3D printing technique, electrically conductive materials are commercially available. In this work two filaments based on thermoplastics filled with carbon or metal nanoparticles are analyzed in terms of their electrical conductance. The printing parameters to process the materials with the 3D printer are optimized with the design of experiments (DoE) method. A model to calculate the resistance of such 3D printed structures is presented and a demonstrator as a proof of concept was 3D printed based on these results. In addition, 3D printing of capacitors is investigated.

scholarly journals A 3D Printable Thermal Energy Storage Crystalline Gel Using Mask-Projection Stereolithography

2018 ◽  
Author(s):  
Yuchen Mao ◽  
Takuya Miyazaki ◽  
Kohei Sakai ◽  
Jin Gong ◽  
Meifang Zhu ◽  
...  
Keyword(s):  
Energy Storage ◽  
3D Printing ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Uv Curing ◽  
Auxiliary Equipment ◽  
Printing Technique ◽  
3D Printed ◽  
Projection Stereolithography ◽  
3D Printing Technique

Most of the phase change materials (PCMs) have been limited to use as functional additions or sealed in containers, and extra auxiliary equipment or supporting matrix is needed. The emergence of 3D printing technique has dramatically advanced the developments of materials and simplified production processes. This study focuses on a novel strategy to model thermal energy storage crystalline gels with three-dimensional architecture directly from liquid resin without supporting materials through light-induced polymerization 3D printing technique. A mask-projection stereolithography printer was used to measure the 3D printing test, and the printable characters of crystalline thermal energy storage P(SA-DMAA) gels with different molar ratios were evaluated. For the P(SA-DMMA) gels with small fraction of SA, the 3D fabrication was realized with higher printing precision both on mili- and micro-meter scales. As a comparison of 3D printed samples, P(SA-DMAA) gels made by other two methods, post-UV curing treatment after 3D printing and UV curing using conventional mold, were prepared. The 3D printed P(SA-DMAA) gels shown high crystallinity. Post–UV curing treatment was beneficial to full curing of 3D printed gels, but did not lead to the further improvement of crystal structure to get higher crystallinity. The P(SA-DMAA) crystalline gel having the highest energy storage enthalpy that reached 69.6 J·g−1 was developed. Its good thermoregulation property in the temperature range from 25 to 40 °C was proved. The P(SA-DMAA) gels are feasible for practical applications as one kind of 3D printing material with thermal energy storage and thermoregulation functionality.

scholarly journals A Review on: 3D Printed Orthopaedic Cast for Improved Forearm Fracture Rehabilitation

2021 ◽  
Vol 9 (11) ◽  
pp. 66-72
Author(s):  
Sushrut Richa
Keyword(s):  
3D Printing ◽  
Bone Fracture ◽  
Forearm Fracture ◽  
Substantial Improvement ◽  
Anatomical Reduction ◽  
Printing Technique ◽  
3D Printed ◽  
The Cost ◽  
Manufacturing Time ◽  
3D Printing Technique

Abstract: Forearm fracture has many management related problems. In order to regain its function anatomical reduction and immobility is very necessary. Traditional cast is not a satisfactory cast as it is heavy, poorly ventilated and often causes fracture related complications. The paper deals with application of 3D printing technique for suitable cast for forearm rehabilitation. Novel 3D printed cast is light weighted, ventilated, custom fit, strong and waterproof and substantial improvement over conventional orthopaedic cast. With the development in technology, it is expected that the cost of fabrication and its manufacturing time will be greatly reduced in the coming future. Keywords: bone fracture, immobility, rehabilitation, 3D printing, orthopaedic cast

Study of Mechanical Properties of 3D Printed Material for Non-Pneumatic Tire Spoke

2021 ◽  
Vol 880 ◽  
pp. 97-102
Author(s):  
Ravivat Rugsaj ◽  
Chakrit Suvanjumrat
Keyword(s):  
Mechanical Properties ◽  
3D Printing ◽  
Elastic Material ◽  
Molding Process ◽  
Breaking Strain ◽  
Pneumatic Tire ◽  
Wide Range ◽  
Printing Technique ◽  
3D Printed ◽  
3D Printing Technique

The spokes of airless tire or non-pneumatic tire (NPT) are normally made with thermoplastic polyurethane (TPU), which is highly elastic material, to replace inflation pressure in conventional pneumatic tire. However there are limitation in designing of complex spoke geometries due to difficulty in manufacturing process, which normally involve molding process. Recently, the 3D printing technique has been improved and can be used to create highly complex geometries with wide range of materials. However the mechanical properties of printed spoke structure using 3D printing technique are still required to design and development of NPT. This research aim to study the mechanical properties of TPU while varying in printing conditions. The specimens were prepared from actual NPT spoke using waterjet cutting technique and 3D printing technique according to the testing standard ASTM D412 and D638, respectively. The tensile tests were performed on the specimens with corresponding crosshead speed. The testing speed of 3D printed specimen were also varied to 100 and 200 mm/min to study the effects of strain rate on mechanical properties. The stress-strain relationships were obtained from tensile testing and the important mechanical properties were then evaluated. The mechanical properties of specimens prepared from actual NPT spokes and 3D printed specimens were then compared. The ultimate stress of specimens prepared from actual NPT spokes in radial direction and 3D printed specimens with 100% infill were found to be 32.92 and 25.47 MPa, respectively, while the breaking strain were found to be 12.98 and 10.87, respectively. Thus, the information obtained from this research can be used to ensure the possibility in creating NPT spoke using 3D printing technique based on elastic material such as TPU.

scholarly journals A 3D-Printed Sensor for Monitoring Biosignals in Small Animals

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Sung-Joon Cho ◽  
Donghak Byun ◽  
Tai-Seung Nam ◽  
Seok-Yong Choi ◽  
Byung-Geun Lee ◽  
...  
Keyword(s):  
3D Printing ◽  
Hip Prosthesis ◽  
Wearable Devices ◽  
Noninvasive Sensors ◽  
Printing Technique ◽  
3D Printed ◽  
Manufacturing Technologies ◽  
Microfabrication Technology ◽  
3D Printing Technique ◽  
Microfabrication Techniques

Although additive manufacturing technologies, also known as 3D printing, were first introduced in the 1980s, they have recently gained remarkable popularity owing to decreased costs. 3D printing has already emerged as a viable technology in many industries; in particular, it is a good replacement for microfabrication technology. Microfabrication technology usually requires expensive clean room equipment and skilled engineers; however, 3D printing can reduce both cost and time dramatically. Although 3D printing technology has started to emerge into microfabrication manufacturing and medical applications, it is typically limited to creating mechanical structures such as hip prosthesis or dental implants. There have been increased interests in wearable devices and the critical part of such wearable devices is the sensing part to detect biosignals noninvasively. In this paper, we have built a 3D-printed sensor that can measure electroencephalogram and electrocardiogram from zebrafish. Despite measuring biosignals noninvasively from zebrafish has been known to be difficult due to that it is an underwater creature, we were able to successfully obtain electrophysiological information using the 3D-printed sensor. This 3D printing technique can accelerate the development of simple noninvasive sensors using affordable equipment and provide an economical solution to physiologists who are unfamiliar with complicated microfabrication techniques.

Scaling up of 3D printed and Ni/Al2O3 coated reactors for CO2 methanation

2019 ◽  
Vol 4 (7) ◽  
pp. 1318-1330 ◽  
Author(s):  
Simge Danaci ◽  
Lidia Protasova ◽  
Vesna Middelkoop ◽  
Nachiketa Ray ◽  
Michel Jouve ◽  
...  
Keyword(s):  
3D Printing ◽  
Scaling Up ◽  
Pilot Scale ◽  
Co2 Methanation ◽  
Printing Technique ◽  
3D Printed ◽  
Metal Supports ◽  
Pilot Scale Reactor ◽  
3D Printing Technique ◽  
Scale Reactor

This study presents the innovative Ni/alumina coated structured metal supports manufactured by 3D-printing technique and their methane productivity comparison in two different experimental set-ups: a lab scale reactor and a mini-pilot scale reactor.

3D printing in modern cardiology

2020 ◽  
Vol 26 ◽  
Author(s):  
Simona Celi ◽  
Emanuele Gasparotti ◽  
Katia Capellini ◽  
Emanuele Vignali ◽  
Benigno Marco Fanni ◽  
...  
Keyword(s):  
3D Printing ◽  
Clinical Utility ◽  
Surgical Planning ◽  
Image Data ◽  
Patient Specific ◽  
Cardiovascular Medicine ◽  
Printing Technique ◽  
3D Printed ◽  
Intervention Planning ◽  
3D Printing Technique

Background: 3D printing represents an emerging technology in the field of cardiovascular medicine. 3D printing can help to perform a better analysis of complex anatomies to optimize intervention planning. Methods: A systematic review was performed to illustrate the 3D printing technology and to describe the workflow to obtain 3D printed models from patient-specific images. Examples from our laboratory of the benefit of 3D printing in planning interventions were also reported. Results: 3D printing technique is reliable when applied to high-quality 3D image data (CTA, CMR, 3D echography) but it still need the involvement of expert operators for image segmentation and mesh refinement. 3D printed models could be useful in interventional planning, although prospective studies with comprehensive and clinically meaningful endpoints are required to demonstrate the clinical utility. Conclusion: 3D printing can be used to improve anatomy understanding and surgical planning.

scholarly journals NUMERICAL AND MECHANICAL ANALYSES OF A 3D-PRINTED TITANIUM TRABECULAR DENTAL IMPLANT

2017 ◽  
Vol 57 (3) ◽  
pp. 218-228
Author(s):  
Luboš Řehounek ◽  
Aleš Jíra
Keyword(s):  
Mechanical Properties ◽  
Numerical Model ◽  
3D Printing ◽  
Prostheses And Implants ◽  
Trabecular Structure ◽  
Compression Tests ◽  
A Value ◽  
Printing Technique ◽  
3D Printed ◽  
3D Printing Technique

The main focus of this paper is to investigate and describe a novel biomaterial structure. The trabecular structure has only recently been recognized as a viable alternative for prostheses and implants and seems to have very promising biocompatibility and mechanical properties. The 3D printing technique was used to create test specimens. These specimens were then tested by nanoindentation and tensile and compression tests. A numerical model was created and curve-fitted to represent the mechanical behavior of the trabecular structure. A significant reduction in the values of Young’s modulus <em>E</em> was observed. The values of <em>E</em> for conventional implant materials are approximately 110–120GPa and the trabecular structure reached a value just below 1GPa. The next effort will be to apply the model onto a real implant. It is the “four leaf clover” implant variant by authors F. Denk Jr., A. Jíra and F. Denk Sr.

Sign in / Sign up

Export Citation Format

Share Document