scholarly journals Photoinitiator Free Resins Composed of Plant-Derived Monomers for the Optical µ-3D Printing of Thermosets

Polymers ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 116 ◽  
Author(s):  
Migle Lebedevaite ◽  
Jolita Ostrauskaite ◽  
Edvinas Skliutas ◽  
Mangirdas Malinauskas
Keyword(s):  
3D Printing ◽  
Ultrashort Pulses ◽  
Insoluble Fraction ◽  
Direct Laser Writing ◽  
Thermal And Mechanical Properties ◽  
Renewable Materials ◽  
Spatial Features ◽  
Direct Laser ◽  
3D Processing ◽  
First Time

In this study, acrylated epoxidized soybean oil (AESO) and mixtures of AESO and vanillin dimethacrylate (VDM) or vanillin diacrylate (VDA) were investigated as photosensitive resins for optical 3D printing without any photoinitiator and solvent. The study of photocross-linking kinetics by real-time photorheometry revealed the higher rate of photocross-linking of pure AESO than that of AESO with VDM or VDA. Through the higher yield of the insoluble fraction, better thermal and mechanical properties were obtained for the pure AESO polymer. Here, for the first time, we validate that pure AESO and mixtures of AESO and VDM can be used for 3D microstructuring by employing direct laser writing lithography technique. The smallest achieved spatial features are 1 µm with a throughput in 6900 voxels per second is obtained. The plant-derived resins were laser polymerized using ultrashort pulses by multiphoton absorption and avalanche induced cross-linking without the usage of any photoinitiator. This advances the light-based additive manufacturing towards the 3D processing of pure cross-linkable renewable materials.

scholarly journals Nanohybrid scaffolds with luminescent remote control

2018 ◽  
Vol 190 ◽  
pp. 04022
Author(s):  
Anastasia V. Sochilina ◽  
Alexander G. Savelyev ◽  
Natalya V. Sholina ◽  
Denis N. Karimov ◽  
Andrey V. Nechaev ◽  
...  
Keyword(s):  
Remote Control ◽  
Small Animal ◽  
Upconversion Nanoparticles ◽  
Hybrid Nanocomposite ◽  
Direct Laser Writing ◽  
Photoluminescence Properties ◽  
Direct Laser ◽  
Scaffold Structure ◽  
Nanocomposite Scaffolds ◽  
First Time

We report on hybrid nanocomposite scaffolds on the base of cross-linked hyaluronic acid derivative with embedded upconversion nanoparticles (UCNPs). The unique photoluminescence properties of specially designed hydrophilic UCNPs enable visualization of hydrogel using NIR irradiation. Formation of scaffold structure can be produced by means of 3D printing or direct laser writing. For the first time, we present visualization of nanohybrid scaffolds in live small animal aiming to demonstrate new possibilities of their luminescent remote control for tissue engineering.

Direct laser writing: Principles and materials for scaffold 3D printing

2015 ◽  
Vol 132 ◽  
pp. 83-89 ◽  
Author(s):  
Alexandros Selimis ◽  
Vladimir Mironov ◽  
Maria Farsari
Keyword(s):  
3D Printing ◽  
Direct Laser Writing ◽  
Laser Writing ◽  
Direct Laser

scholarly journals Vanillin Acrylate-Based Resins for Optical 3D Printing

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 397 ◽  
Author(s):  
Aukse Navaruckiene ◽  
Edvinas Skliutas ◽  
Sigita Kasetaite ◽  
Sima Rekštytė ◽  
Vita Raudoniene ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
3D Printing ◽  
Network Formation ◽  
Chitosan Film ◽  
Antimicrobial Effect ◽  
Insoluble Fraction ◽  
Direct Laser ◽  
Visible Irradiation ◽  
Materials Used ◽  
Vanillin Derivatives

The investigation of biobased systems as photocurable resins for optical 3D printing has attracted great attention in recent years; therefore, novel vanillin acrylate-based resins were designed and investigated. Cross-linked polymers were prepared by radical photopolymerization of vanillin derivatives (vanillin dimethacrylate and vanillin diacrylate) using ethyl(2,4,6-trimethylbenzoyl)phenylphosphinate as photoinitiator. The changes of rheological properties were examined during the curing with ultraviolet/visible irradiation to detect the influences of solvent, photoinitiator, and vanillin derivative on cross-linking rate and network formation. Vanillin diacrylate-based polymers had higher values of yield of insoluble fraction, thermal stability, and better mechanical properties in comparison to vanillin dimethacrylate-based polymers. Moreover, the vanillin diacrylate polymer film showed a significant antimicrobial effect, only a bit weaker than that of chitosan film. Thermal and mechanical properties of vanillin acrylate-based polymers were comparable with those of commercial petroleum-derived materials used in optical 3D printing. Also, vanillin diacrylate proved to be well-suited for optical printing as was demonstrated by employing direct laser writing 3D lithography and microtransfer molding techniques.

scholarly journals Custom on demand 3D printing of functional microstructures

2015 ◽  
Vol 55 (3) ◽  
Author(s):  
Linas Jonušauskas ◽  
Edvinas Skliutas ◽  
Simas Butkus ◽  
Mangirdas Malinauskas
Keyword(s):  
3D Printing ◽  
Biomedical Applications ◽  
Laser Light ◽  
Rapid Development ◽  
Ultrafast Laser ◽  
Direct Laser Writing ◽  
Fused Filament Fabrication ◽  
3D Scaffolds ◽  
On Demand ◽  
Direct Laser

Rapid development in 3D printing technologies promises a cheap and simple yet reliable way for producing various components and structures for research in numerous science fields. This work is dedicated to investigate the possibility to use fused filament fabrication based 3D printing to fabricate microchannels for microfluidical applications as well as diverse 3D scaffolds for biomedical applications. We also examine the possibility to further improve fabricated structures by employing an ultrafast laser, namely by laser light filamentation and using direct laser writing. Results of this study are discussed in detail and outlook for further work in this field is given.

scholarly journals Controlled formation of metallic tellurium nanocrystals in tellurite glasses using femtosecond direct laser writing

2021 ◽  
Author(s):  
Renato Grigolon Capelo ◽  
Juliana M.P. Almeida ◽  
Douglas Faza Franco ◽  
Gael Yves Poirier ◽  
Cleber Renato Mendonça ◽  
...  
Keyword(s):  
Tellurite Glasses ◽  
Direct Laser Writing ◽  
Laser Writing ◽  
Direct Laser

3D printing of spent coffee ground derived biochar reinforced epoxy composites

2021 ◽  
pp. 002199832110022
Author(s):  
Ahmed Alhelal ◽  
Zaheeruddin Mohammed ◽  
Shaik Jeelani ◽  
Vijaya K Rangari
Keyword(s):  
3D Printing ◽  
Flexural Modulus ◽  
Flexural Properties ◽  
Direct Write ◽  
Thermal And Mechanical Properties ◽  
Spent Coffee Grounds ◽  
Coffee Grounds ◽  
Spent Coffee Ground ◽  
Coffee Ground ◽  
3D Printed

Semi-crystalline carbon biochar is derived from spent coffee grounds (SCG) by a controlled pyrolysis process at high temperature/pressure conditions. Obtained biochar is characterized using XRD, SEM, and TEM techniques. Biochar particles are in the micrometer range with nanostructured morphologies. The SCG biochar thus produced is used as reinforcement in epoxy resin to 3 D print samples using the direct-write (DW) method with 1 and 3 wt. % loadings. Rheology results show that the addition of biochar makes resin viscous, enabling it to be stable soon after print; however, it could also lead to clogging of resin in printer head. The printed samples are characterized for chemical, thermal and mechanical properties using FTIR, TGA, DMA and flexure tests. Storage modulus improved with 1 wt. % biochar addition up to 27.5% and flexural modulus and strength increased up to 55.55% and 43.30% respectively. However, with higher loading of 3 wt. % both viscoelastic and flexural properties of 3D printed samples drastically reduced thus undermining the feasibility of 3D printing biochar reinforced epoxies at higher loadings.

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