scholarly journals 3D-printed self-healing hydrogels via Digital Light Processing

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Matteo Caprioli ◽  
Ignazio Roppolo ◽  
Annalisa Chiappone ◽  
Liraz Larush ◽  
Candido Fabrizio Pirri ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Room Temperature ◽  
Soft Robotics ◽  
Self Healing ◽  
Digital Light Processing ◽  
Initial Strength ◽  
Additive Manufacturing Technology ◽  
3D Printed ◽  
Living Tissues ◽  
Complex Architecture

AbstractSelf-healing hydrogels may mimic the behavior of living tissues, which can autonomously repair minor damages, and therefore have a high potential for application in biomedicine. So far, such hydrogels have been processed only via extrusion-based additive manufacturing technology, limited in freedom of design and resolution. Herein, we present 3D-printed hydrogel with self-healing ability, fabricated using only commercially available materials and a commercial Digital Light Processing printer. These hydrogels are based on a semi-interpenetrated polymeric network, enabling self-repair of the printed objects. The autonomous restoration occurs rapidly, at room temperature, and without any external trigger. After rejoining, the samples can withstand deformation and recovered 72% of their initial strength after 12 hours. The proposed approach enables 3D printing of self-healing hydrogels objects with complex architecture, paving the way for future applications in diverse fields, ranging from soft robotics to energy storage.

scholarly journals Polymer-Derived Biosilicate®-like Glass-Ceramics: Engineering of Formulations and Additive Manufacturing of Three-Dimensional Scaffolds

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5170
Author(s):  
Fulden Dogrul ◽  
Paulina Ożóg ◽  
Martin Michálek ◽  
Hamada Elsayed ◽  
Dušan Galusek ◽  
...  
Keyword(s):  
Tissue Engineering ◽  
Additive Manufacturing ◽  
Room Temperature ◽  
Three Dimensional ◽  
Glass Ceramics ◽  
Gas Release ◽  
Carbon Phase ◽  
Digital Light Processing ◽  
Direct Ink Writing ◽  
Additive Manufacturing Technology

Silicone resins, filled with phosphates and other oxide fillers, yield upon firing in air at 1100 °C, a product resembling Biosilicate® glass-ceramics, one of the most promising systems for tissue engineering applications. The process requires no preliminary synthesis of parent glass, and the polymer route enables the application of direct ink writing (DIW) of silicone-based mixtures, for the manufacturing of reticulated scaffolds at room temperature. The thermal treatment is later applied for the conversion into ceramic scaffolds. The present paper further elucidates the flexibility of the approach. Changes in the reference silicone and firing atmosphere (from air to nitrogen) were studied to obtain functional composite biomaterials featuring a carbon phase embedded in a Biosilicate®-like matrix. The microstructure was further modified either through a controlled gas release at a low temperature, or by the revision of the adopted additive manufacturing technology (from DIW to digital light processing).

scholarly journals Rapid fabrication of MOF-based mixed matrix membranes through digital light processing

2021 ◽  
Author(s):  
Alexey Pustovarenko ◽  
Beatriz Seoane ◽  
Edy Abou-Hamad ◽  
Helen E King ◽  
Bert Weckhuysen ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
3D Printing ◽  
Processing Speed ◽  
Mixed Matrix Membranes ◽  
Scientific Interest ◽  
Mixed Matrix ◽  
Digital Light Processing ◽  
Additive Manufacturing Technology ◽  
Rapid Fabrication ◽  
Manufacturing Methods

3D printing, also known as additive manufacturing technology, has greatly expanded across multiple sectors of technology replacing classical manufacturing methods by combining processing speed and high precision. The scientific interest...

Manufacture of Lenses and Diffraction Gratings Using DLP As an Additive Manufacturing Technology

2018 ◽  
Author(s):  
Laura Daniela Vallejo Melgarejo ◽  
Jose García ◽  
Ronald G. Reifenberger ◽  
Brittany Newell
Keyword(s):  
Additive Manufacturing ◽  
3D Printing ◽  
Diffraction Grating ◽  
Diffraction Gratings ◽  
Optical Microscope ◽  
Manufacturing Technology ◽  
Manufacturing Processes ◽  
Digital Light Processing ◽  
Additive Manufacturing Technology ◽  
Potential Use

This document condenses the results obtained when 3D printing lenses and their potential use as diffraction gratings using Digital Light Processing (DLP), as an additive manufacturing technique. This project investigated the feasibility of using DLP additive manufacturing for producing custom designed lenses and gratings. DLP was identified as the preferred manufacturing technology for gratings fabrication. Diffraction gratings take advantage of the anisotropy, inherent in additive manufacturing processes, to produce a collated pattern of multiple fringes on a substrate with completely smooth surfaces. The gratings are transmissive and were manufactured with slit separations of 10, 25 and 50 μm. More than 50 samples were printed at various build angles and mechanically treated for maximum optical transparency. The variables of the irradiance equation were obtained from photographs taken with an optical microscope. These values were used to estimate theoretical irradiance patterns of a diffraction grating and compared against the experimental 3-D printed grating. The resulting patterns were found to be remarkably similar in amplitude and distance between peaks when compared to theoretical values.

scholarly journals DLP 3D Printing Meets Lignocellulosic Biopolymers: Carboxymethyl Cellulose Inks for 3D Biocompatible Hydrogels

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1655 ◽  
Author(s):  
Giuseppe Melilli ◽  
Irene Carmagnola ◽  
Chiara Tonda-Turo ◽  
Fabrizio Pirri ◽  
Gianluca Ciardelli ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
3D Printing ◽  
Carboxymethyl Cellulose ◽  
Biomedical Applications ◽  
Digital Light Processing ◽  
Chemically Modified ◽  
Significant Step ◽  
3D Printed ◽  
Biomedical Field

The development of new bio-based inks is a stringent request for the expansion of additive manufacturing towards the development of 3D-printed biocompatible hydrogels. Herein, methacrylated carboxymethyl cellulose (M-CMC) is investigated as a bio-based photocurable ink for digital light processing (DLP) 3D printing. CMC is chemically modified using methacrylic anhydride. Successful methacrylation is confirmed by 1H NMR and FTIR spectroscopy. Aqueous formulations based on M-CMC/lithium phenyl-2,4,6-trimethylbenzoylphosphinate (LAP) photoinitiator and M-CMC/Dulbecco’s Modified Eagle Medium (DMEM)/LAP show high photoreactivity upon UV irradiation as confirmed by photorheology and FTIR. The same formulations can be easily 3D-printed through a DLP apparatus to produce 3D shaped hydrogels with excellent swelling ability and mechanical properties. Envisaging the application of the hydrogels in the biomedical field, cytotoxicity is also evaluated. The light-induced printing of cellulose-based hydrogels represents a significant step forward in the production of new DLP inks suitable for biomedical applications.

scholarly journals Additive Manufacturing Technology in Orthodontic Devices Development

2020 ◽  
Vol 9 (3) ◽  
pp. 425-432
Keyword(s):  
Additive Manufacturing ◽  
Manufacturing Technology ◽  
Process Time ◽  
Digital Light Processing ◽  
Additive Manufacturing Technology ◽  
Long Time ◽  
Dental Models ◽  
Clear Plastic ◽  
Orthodontic Devices ◽  
Metal Wires

Traditional wires and brackets has been widely used as orthodontic devices for long time. The metal wires and brackets help to correct the position of teeth as well as fix the cavity. However, metal brace wires have quite a lot limitations. Patients wearing metal brace have many food restrictions and feel not comfortable. Brushing and flossing are required to remove the food debris frequently. Hence, clear plastic aligners have popped up recently. Since the metal brace fabrication process has associated with prolonged process time as a result of a long workflow process starting from brace mold presentation to the prosthesis execution. The growing of additive manufacturing technology make it possible to develop complex structures and shapes of dental brace. By combining 3D oral scanning, it is possible to shorten the lead time of orthodontic treatment process. This review, therefore, investigates the use of Digital Light Processing (DLP) Additive Manufacturing Technology for plastic dental brace development as a remedy to the problems associated with the traditional methods. The study reveals that it is feasible to fabricate these plastic braces utilising the DLP technology. DLP technology is affordable and arguably able to produce dental models with high levels of assurance and accuracy.

scholarly journals 3D Printing of a Self-Healing Thermoplastic Polyurethane through FDM: From Polymer Slab to Mechanical Assessment

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 305
Author(s):  
Linda Ritzen ◽  
Vincenzo Montano ◽  
Santiago J. Garcia
Keyword(s):  
3D Printing ◽  
Room Temperature ◽  
Thermoplastic Polyurethane ◽  
The Self ◽  
Added Value ◽  
Fused Deposition Modelling ◽  
Full Potential ◽  
Self Healing ◽  
Fused Deposition ◽  
3D Printed

The use of self-healing (SH) polymers to make 3D-printed polymeric parts offers the potential to increase the quality of 3D-printed parts and to increase their durability and damage tolerance due to their (on-demand) dynamic nature. Nevertheless, 3D-printing of such dynamic polymers is not a straightforward process due to their polymer architecture and rheological complexity and the limited quantities produced at lab-scale. This limits the exploration of the full potential of self-healing polymers. In this paper, we present the complete process for fused deposition modelling of a room temperature self-healing polyurethane. Starting from the synthesis and polymer slab manufacturing, we processed the polymer into a continuous filament and 3D printed parts. For the characterization of the 3D printed parts, we used a compression cut test, which proved useful when limited amount of material is available. The test was able to quasi-quantitatively assess both bulk and 3D printed samples and their self-healing behavior. The mechanical and healing behavior of the 3D printed self-healing polyurethane was highly similar to that of the bulk SH polymer. This indicates that the self-healing property of the polymer was retained even after multiple processing steps and printing. Compared to a commercial 3D-printing thermoplastic polyurethane, the self-healing polymer displayed a smaller mechanical dependency on the printing conditions with the added value of healing cuts at room temperature.

3D printed stretchable sensor based on silver nanowires-polydimethylsiloxane

2021 ◽  
pp. 2150466
Author(s):  
Qiang Li ◽  
Shengbo Sang ◽  
Qiang Zhang ◽  
Zhen Pei
Keyword(s):  
Additive Manufacturing ◽  
3D Printing ◽  
Structural Design ◽  
Silver Nanowires ◽  
Ethanol Solution ◽  
Template Method ◽  
Flexible Sensor ◽  
Physiological Signal ◽  
Additive Manufacturing Technology ◽  
3D Printed

As a new rapid additive manufacturing technology that has emerged in recent years, 3D printing technology can realize the precise manufacturing of complex and flexible sensor structures. In this study, a sensor was fabricated by injecting silver nanowires (AgNWs) ethanol solution into stretchable polydimethylsiloxane (PDMS). The substrate was used in two design configurations through a 3D printing template method, i.e. “straight” and “wave”. Compared to the straight sensor, the structural design of the wave sensor could increase the stretch range and sensitivity. In particular, the stretch range increased by 26.1% and the sensitivity improved by 96.0%. The stretchable sensor was successfully applied in pronunciation recognition and gait detection. Therefore, the stretchable sensor is also expected to be further used in fields such as foldable phones and wearable physiological signal sensors.

scholarly journals Utilization of Antibacterial Nanoparticles in Photocurable Additive Manufacturing of Advanced Composites for Improved Public Health

Polymers ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2616
Author(s):  
Christopher Billings ◽  
Changjie Cai ◽  
Yingtao Liu
Keyword(s):  
Public Health ◽  
Tensile Strength ◽  
Additive Manufacturing ◽  
Abrasion Resistance ◽  
Antimicrobial Properties ◽  
Digital Light Processing ◽  
Antimicrobial Function ◽  
3D Printed ◽  
Commercial Applications ◽  
Antibacterial Nanoparticles

This paper presents the additive manufacturing and characterization of nanoparticle-reinforced photocurable resin-based nanocomposites with a potential antimicrobial function for improved public health applications. Two types of photocurable resins are reinforced by titanium dioxide (TiO2) or zinc oxide (ZnO) nanoparticles with average diameters in the 10–30 nm range to provide antimicrobial properties. The developed nanocomposites can be additively manufactured using the digital light processing method with an outstanding surface quality and precise geometrical accuracy. Experimental characterizations are conducted to investigate key mechanical properties of the 3D printed nanocomposites, including Young’s Modulus, tensile strength, and abrasion resistance. Specimens produced were observed to demonstrate the following characteristics during testing. Tensile strength increased by 42.2% at a maximum value of 29.53 MPa. The modulus of elasticity increased by 14.3%, and abrasion resistance increased by 15.8%. The proper dispersion of the nanoparticles within the cured resin is validated by scanning electron images. The wettability and water absorption testing results indicate that the developed nanocomposites have an outstanding water resistance capability. The pairing of digital light processing with these novel nanocomposites allows for the creation of complex composite geometries that are not capable through other manufacturing processes. Therefore, they have the potential for long-term usage to improve general public health with antimicrobial functionality. The pairing of an unmodified photocurable resin with a 1% ZnO concentration demonstrated the most promise for commercial applications.

scholarly journals Recent Trends and Innovation in Additive Manufacturing of Soft Functional Materials

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4521
Author(s):  
Jaime Eduardo Regis ◽  
Anabel Renteria ◽  
Samuel Ernesto Hall ◽  
Md Sahid Hassan ◽  
Cory Marquez ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Functional Materials ◽  
Soft Materials ◽  
Soft Robotics ◽  
Self Healing ◽  
Future Trends ◽  
Energy Harvesters ◽  
Mechanical And Physical Properties ◽  
Recent Trends ◽  
The One

The growing demand for wearable devices, soft robotics, and tissue engineering in recent years has led to an increased effort in the field of soft materials. With the advent of personalized devices, the one-shape-fits-all manufacturing methods may soon no longer be the standard for the rapidly increasing market of soft devices. Recent findings have pushed technology and materials in the area of additive manufacturing (AM) as an alternative fabrication method for soft functional devices, taking geometrical designs and functionality to greater heights. For this reason, this review aims to highlights recent development and advances in AM processable soft materials with self-healing, shape memory, electronic, chromic or any combination of these functional properties. Furthermore, the influence of AM on the mechanical and physical properties on the functionality of these materials is expanded upon. Additionally, advances in soft devices in the fields of soft robotics, biomaterials, sensors, energy harvesters, and optoelectronics are discussed. Lastly, current challenges in AM for soft functional materials and future trends are discussed.

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