Fabrication of alumina ceramics with functional gradient structures by digital light processing 3D printing technology

2021 ◽  
Author(s):  
Yong Zeng ◽  
Lijun Sun ◽  
Haihua Yao ◽  
Jimin Chen
Keyword(s):  
3D Printing ◽  
Alumina Ceramics ◽  
Printing Technology ◽  
Digital Light Processing ◽  
Functional Gradient ◽  
3D Printing Technology

scholarly journals Flexible Pressure Sensor with Micro-Structure Arrays Based on PDMS and PEDOT:PSS/PUD&CNTs Composite Film with 3D Printing

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6499
Author(s):  
Yiwei Shao ◽  
Qi Zhang ◽  
Yulong Zhao ◽  
Xing Pang ◽  
Mingjie Liu ◽  
...  
Keyword(s):  
3D Printing ◽  
Pressure Sensor ◽  
Pressure Sensors ◽  
Human Motion ◽  
Bottom Plate ◽  
Durability Test ◽  
Printing Technology ◽  
Digital Light Processing ◽  
3D Printing Technology ◽  
Flexible Pressure Sensor

Flexible pressure sensors are widely used in different fields, especially in human motion, robot monitoring and medical treatment. Herein, a flexible pressure sensor consists of the flat top plate, and the microstructured bottom plate is developed. Both plates are made of polydimethylsiloxane (PDMS) by molding from the 3D printed template. The contact surfaces of the top and bottom plates are coated with a mixture of poly (3,4-ethylenedioxythiophene) poly (styrene sulfonate) (PEDOT:PSS) and polyurethane dispersion (PUD) as stretchable film electrodes with carbon nanotubes on the electrode surface. By employing 3D printing technology, using digital light processing (DLP), the fabrication of the sensor is low-cost and fast. The sensor models with different microstructures are first analyzed by the Finite Element Method (FEM), and then the models are fabricated and tested. The sensor with 5 × 5 hemispheres has a sensitivity of 3.54 × 10−3 S/kPa in the range of 0–22.2 kPa. The zero-temperature coefficient is −0.0064%FS/°C. The durability test is carried out for 2000 cycles, and it remains stable during the whole test. This work represents progress in flexible pressure sensing and demonstrates the advantages of 3D printing technology in sensor processing.

3D printing of dual cross-linked hydrogel for fingerprint-like iontronic pressure sensor

2021 ◽  
Author(s):  
Honghao Yan ◽  
Jun Zhou ◽  
Chengyun Wang ◽  
Huaqiang Gong ◽  
Wu Liu ◽  
...  
Keyword(s):  
3D Printing ◽  
Pressure Sensor ◽  
High Sensitivity ◽  
Human Motion ◽  
Printing Technology ◽  
Digital Light Processing ◽  
Detection Range ◽  
3D Printing Technology ◽  
Flexible Devices ◽  
Conductive Hydrogel

Abstract Hydrogels with intrinsic high stretchability and flexibility are extremely attractive for soft electronics. However, the existing complicated and laborious methods (such as mold curing) to fabricate microstructured hydrogel (MH) still limit the development of hydrogel-based sensors for flexible devices. Herein, we use digital light processing 3D printing technology to rapidly construct double-network (DN) ionic conductive hydrogel, and then design and print fingerprint-like MH film to manufacture an iontronic pressure sensor. In particular, the DN hydrogel consists of acrylamide/acrylic acid to form a covalently cross-linked network, and magnesium chloride is introduced to form an ionic cross-linked physical network in the hydrogel. The printability (with resolution 150 μm) and mechanical property tunability of DN hydrogel enable the convenient fabrication of sensors. With the biomimetic fingerprint MH film, the iontronic pressure sensor not only has a high sensitivity (0.06 kPa-1), but also has a large detection range (26 Pa-70 kPa) and good stability (200 cycles of pressure loading). We demonstrated that our sensor can be applied to realize tactile sensing in a prosthetic application and detect human motion. With the easy strategy of constructing DN hydrogel with microstructures by 3D printing technology, hydrogel-based sensors are anticipated to be employed in more smart electronics.

scholarly journals The Fabrication of Micro Beam from Photopolymer by Digital Light Processing 3D Printing Technology

Micromachines ◽  
2020 ◽  
Vol 11 (5) ◽  
pp. 518
Author(s):  
Ishak Ertugrul
Keyword(s):  
3D Printing ◽  
High Sensitivity ◽  
Industrial Applications ◽  
Original Design ◽  
Printing Technology ◽  
Digital Light Processing ◽  
3D Printing Technology ◽  
Print Materials ◽  
Supporting Structures ◽  
Better Than

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.

scholarly journals Mechanical and Strain-Sensing Capabilities of Carbon Nanotube Reinforced Composites by Digital Light Processing 3D Printing Technology

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 975 ◽  
Author(s):  
Alejandro Cortés ◽  
Xoan F. Sánchez-Romate ◽  
Alberto Jiménez-Suárez ◽  
Mónica Campo ◽  
Alejandro Ureña ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
3D Printing ◽  
Linear Response ◽  
Interparticle Distance ◽  
Gauge Factor ◽  
Reinforced Composites ◽  
Strain Sensing ◽  
Printing Technology ◽  
Digital Light Processing ◽  
3D Printing Technology

Mechanical and strain sensing capabilities of carbon nanotube (CNT) reinforced composites manufactured by digital light processing (DLP) 3D printing technology have been studied. Both CNT content and a post-curing treatment effects have been analyzed. It has been observed that post-curing treatment has a significant influence on mechanical properties, with an increase of Young’s modulus and glass transition temperature whereas their effect in electrical properties is not so important. Furthermore, the strain sensing tests show a linear response of electrical resistance with applied strain, with higher values of sensitivity when decreasing CNT content due to a higher interparticle distance. Moreover, the electrical sensitivity of bending tests is significantly lower than in tensile ones due to the compression subjected face effect. Therefore, the good gauge factor values (around 2–3) and the high linear response proves the applicability of the proposed nanocomposites in structural health monitoring applications.

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