scholarly journals Coumarins as Powerful Photosensitizers for the Cationic Polymerization of Epoxy-Silicones under Near-UV and Visible Light and Applications for 3D Printing Technology

Molecules ◽  
2020 ◽  
Vol 25 (9) ◽  
pp. 2063 ◽  
Author(s):  
Mira Abdallah ◽  
Akram Hijazi ◽  
Frédéric Dumur ◽  
Jacques Lalevée
Keyword(s):  
3D Printing ◽  
Visible Light ◽  
Blue Light ◽  
Laser Diode ◽  
Cationic Polymerization ◽  
High Performance ◽  
Printing Technology ◽  
3D Printing Technology ◽  
Visible Irradiation

In this study, eight coumarins (coumarins 1–8) are proposed as near-UV and blue light sensitive photoinitiators/photosensitizers for the cationic polymerization (CP) of epoxysilicones when combined with 4-isopropyl-4’-methyldiphenyliodonium tetrakis(pentafluorophenyl)borate (IOD). Among these coumarins, four of them (coumarins 1, 2, 6 and 8) have never been reported in the literature, i.e., these structures have been specifically designed to act as photoinitiators for silicones upon near UV and visible irradiation. Good final reactive epoxy function conversions (FCs) and also high rates of polymerization (Rp) were achieved in the presence of the newly proposed coumarin-based systems. The polymers generated from the photopolymerization of epoxysilicones can be considered as attractive candidates for several applications such as: elastomers, coatings, adhesives, and so on. The goal of this study focuses also on the comparison of the new proposed coumarins with well-established photosensitizers i.e., 1-chloro-4-propoxythioxanthone (CPTX), 9,10-dibutoxyanthracene (DBA) or some commercial coumarins (Com. Coum). As example of their high performance, the new proposed coumarins were also used for laser write experiments upon irradiation with a laser diode at 405 nm in order to develop new cationic 3D printing systems.

scholarly journals Phenothiazine derivatives as photoredox catalysts for cationic and radical photosensitive resins for 3D printing technology and photocomposite synthesis

2019 ◽  
Vol 10 (45) ◽  
pp. 6145-6156 ◽  
Author(s):  
Mira Abdallah ◽  
Thanh-Tuân Bui ◽  
Fabrice Goubard ◽  
Dimitra Theodosopoulou ◽  
Frédéric Dumur ◽  
...  
Keyword(s):  
3D Printing ◽  
Visible Light ◽  
High Performance ◽  
Phenothiazine Derivatives ◽  
Printing Technology ◽  
3D Printing Technology

New phenothiazine derivatives are synthesized and proposed as high performance visible light photoinitiators.

Rational Design of a High Performance and Robust Solar Evaporator via 3D‐Printing Technology

2021 ◽  
pp. 2102649
Author(s):  
Sourav Chaule ◽  
Jongha Hwang ◽  
Seong‐Ji Ha ◽  
Jihun Kang ◽  
Jong‐Chul Yoon ◽  
...  
Keyword(s):  
3D Printing ◽  
High Performance ◽  
Rational Design ◽  
Printing Technology ◽  
3D Printing Technology

scholarly journals From closed to open. Democratising medical devices using additive manufacture and open source development and distribution systems.

2021 ◽  
Author(s):  
Callum Allen
Keyword(s):  
3D Printing ◽  
Data Collection ◽  
Open Source ◽  
Blue Light ◽  
Medical Devices ◽  
Distribution Systems ◽  
Printing Technology ◽  
3D Printing Technology ◽  
Research Through Design ◽  
Open Source Development

<p><b>Pupils can provide important neurological information that can aid in the diagnosis of a range of conditions, including aneurysms, impending strokes and tumors in the lung (Gale, et al). In a research context, there is increasing interest in studying the intrinsically photosensitive Retinal Ganglion cells (ipRGC), which respond to intense blue light thanks to a photo pigment called melanopsin. Studying these cells could lead to a better understanding of sleep disorders and a range of optic nerve diseases. Although commercially available pupil testing devices do exist, all cost upwards of $10,000, and suffer from either poor portability or limitations in the tests they can perform. Specifically, the ipRGC require a specific intensity of blue light to be activated and measured, which most devices cannot produce. </b></p><p>In recent years, the open source movement has enabled users from around the world to freely collaborate on the development and distribution of their own products. At first, only software could be produced using this approach, however the continued improvement of 3D printing technology has enabled the same model to be applied to physical products as well. From a medical perspective, this is particularly exciting. </p><p>The aim of this research was to produce an inexpensive, open source pupilometer that runs on widely available components, can be distributed online and manufactured using 3D printing technology. In doing so, this thesis asks the question; How can an open source development and distribution model be used in conjunction with online 3D printing services and widely available parts and components to produce an inexpensive and open source pupilometer? </p><p>To answer this, a range of practice based methodologies, including research for design and research through design were used to explore this new potential. The resulting design proposal demonstrates how online file sharing platforms, in conjunction with distributed 3D printing services and online supply chains can be combined to develop new medical devices. The ability to collect pupil data using an open source pupilometer may lead to expanded data collection and diagnostic capabilities from doctors in a number of clinical settings, while a cloud based data collection system taking the form of a smartphone app will create a large biometric database and cooperative online research community. </p>

scholarly journals 3D printing of anisotropic polymer nanocomposites with aligned BaTiO3 nanowires for enhanced energy density

2020 ◽  
Vol 1 (1) ◽  
pp. 14-19 ◽  
Author(s):  
Hang Luo ◽  
Xuefan Zhou ◽  
Ru Guo ◽  
Xi Yuan ◽  
Hehao Chen ◽  
...  
Keyword(s):  
Energy Density ◽  
3D Printing ◽  
Polymer Nanocomposites ◽  
High Performance ◽  
Vinylidene Fluoride ◽  
Printing Technology ◽  
3D Printing Technology ◽  
Poly Vinylidene Fluoride

High-performance flexible poly(vinylidene fluoride–chlorotrifluoroethylene) (P(VDF–CTFE)) nanocomposites with aligned BaTiO3 nanowires using 3D printing technology were demonstrated.

scholarly journals From closed to open. Democratising medical devices using additive manufacture and open source development and distribution systems.

2021 ◽  
Author(s):  
Callum Allen
Keyword(s):  
3D Printing ◽  
Data Collection ◽  
Open Source ◽  
Blue Light ◽  
Medical Devices ◽  
Distribution Systems ◽  
Printing Technology ◽  
3D Printing Technology ◽  
Research Through Design ◽  
Open Source Development

<p><b>Pupils can provide important neurological information that can aid in the diagnosis of a range of conditions, including aneurysms, impending strokes and tumors in the lung (Gale, et al). In a research context, there is increasing interest in studying the intrinsically photosensitive Retinal Ganglion cells (ipRGC), which respond to intense blue light thanks to a photo pigment called melanopsin. Studying these cells could lead to a better understanding of sleep disorders and a range of optic nerve diseases. Although commercially available pupil testing devices do exist, all cost upwards of $10,000, and suffer from either poor portability or limitations in the tests they can perform. Specifically, the ipRGC require a specific intensity of blue light to be activated and measured, which most devices cannot produce. </b></p><p>In recent years, the open source movement has enabled users from around the world to freely collaborate on the development and distribution of their own products. At first, only software could be produced using this approach, however the continued improvement of 3D printing technology has enabled the same model to be applied to physical products as well. From a medical perspective, this is particularly exciting. </p><p>The aim of this research was to produce an inexpensive, open source pupilometer that runs on widely available components, can be distributed online and manufactured using 3D printing technology. In doing so, this thesis asks the question; How can an open source development and distribution model be used in conjunction with online 3D printing services and widely available parts and components to produce an inexpensive and open source pupilometer? </p><p>To answer this, a range of practice based methodologies, including research for design and research through design were used to explore this new potential. The resulting design proposal demonstrates how online file sharing platforms, in conjunction with distributed 3D printing services and online supply chains can be combined to develop new medical devices. The ability to collect pupil data using an open source pupilometer may lead to expanded data collection and diagnostic capabilities from doctors in a number of clinical settings, while a cloud based data collection system taking the form of a smartphone app will create a large biometric database and cooperative online research community. </p>

scholarly journals From closed to open. Democratising medical devices using additive manufacture and open source development and distribution systems.

2021 ◽  
Author(s):  
Callum Allen
Keyword(s):  
3D Printing ◽  
Data Collection ◽  
Open Source ◽  
Blue Light ◽  
Medical Devices ◽  
Distribution Systems ◽  
Printing Technology ◽  
3D Printing Technology ◽  
Research Through Design ◽  
Open Source Development

<p><b>Pupils can provide important neurological information that can aid in the diagnosis of a range of conditions, including aneurysms, impending strokes and tumors in the lung (Gale, et al). In a research context, there is increasing interest in studying the intrinsically photosensitive Retinal Ganglion cells (ipRGC), which respond to intense blue light thanks to a photo pigment called melanopsin. Studying these cells could lead to a better understanding of sleep disorders and a range of optic nerve diseases. Although commercially available pupil testing devices do exist, all cost upwards of $10,000, and suffer from either poor portability or limitations in the tests they can perform. Specifically, the ipRGC require a specific intensity of blue light to be activated and measured, which most devices cannot produce. </b></p><p>In recent years, the open source movement has enabled users from around the world to freely collaborate on the development and distribution of their own products. At first, only software could be produced using this approach, however the continued improvement of 3D printing technology has enabled the same model to be applied to physical products as well. From a medical perspective, this is particularly exciting. </p><p>The aim of this research was to produce an inexpensive, open source pupilometer that runs on widely available components, can be distributed online and manufactured using 3D printing technology. In doing so, this thesis asks the question; How can an open source development and distribution model be used in conjunction with online 3D printing services and widely available parts and components to produce an inexpensive and open source pupilometer? </p><p>To answer this, a range of practice based methodologies, including research for design and research through design were used to explore this new potential. The resulting design proposal demonstrates how online file sharing platforms, in conjunction with distributed 3D printing services and online supply chains can be combined to develop new medical devices. The ability to collect pupil data using an open source pupilometer may lead to expanded data collection and diagnostic capabilities from doctors in a number of clinical settings, while a cloud based data collection system taking the form of a smartphone app will create a large biometric database and cooperative online research community. </p>

scholarly journals Rational Design of a High Performance and Robust Solar Evaporator via 3D‐Printing Technology (Adv. Mater. 38/2021)

2021 ◽  
Vol 33 (38) ◽  
pp. 2170299
Author(s):  
Sourav Chaule ◽  
Jongha Hwang ◽  
Seong‐Ji Ha ◽  
Jihun Kang ◽  
Jong‐Chul Yoon ◽  
...  
Keyword(s):  
3D Printing ◽  
High Performance ◽  
Rational Design ◽  
Printing Technology ◽  
3D Printing Technology
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