scholarly journals Room temperature 3D printing of super-soft and solvent-free elastomers

2020 ◽  
Vol 6 (46) ◽  
pp. eabc6900
Author(s):  
Renxuan Xie ◽  
Sanjoy Mukherjee ◽  
Adam E. Levi ◽  
Veronica G. Reynolds ◽  
Hengbin Wang ◽  
...  
Keyword(s):  
3D Printing ◽  
Room Temperature ◽  
Microphase Separation ◽  
Three Dimensional ◽  
Solvent Free ◽  
Advanced Materials ◽  
Structure Property ◽  
Ultraviolet Curing ◽  
Yield Strain ◽  
Processing Strategies

Super-soft elastomers derived from bottlebrush polymers show promise as advanced materials for biomimetic tissue and device applications, but current processing strategies are restricted to simple molding. Here, we introduce a design concept that enables the three-dimensional (3D) printing of super-soft and solvent-free bottlebrush elastomers at room temperature. The key advance is a class of inks comprising statistical bottlebrush polymers that self-assemble into well-ordered body-centered cubic sphere phases. These soft solids undergo sharp and reversible yielding at 20°C in response to shear with a yield stress that can be tuned by manipulating the length scale of microphase separation. The addition of a soluble photocrosslinker allows complete ultraviolet curing after extrusion to form super-soft elastomers with near-perfect recoverable elasticity well beyond the yield strain. These structure–property design rules create exciting opportunities to tailor the performance of 3D-printed elastomers in ways that are not possible with current materials and processes.

scholarly journals Porous cage-derived nanomaterial inks for direct and internal three-dimensional printing

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Tangi Aubert ◽  
Jen-Yu Huang ◽  
Kai Ma ◽  
Tobias Hanrath ◽  
Ulrich Wiesner
Keyword(s):  
3D Printing ◽  
Structural Control ◽  
High Surface ◽  
High Surface Area ◽  
Three Dimensional ◽  
Processing Technique ◽  
Advanced Materials ◽  
Host Matrix ◽  
Digital Light Processing ◽  
Three Dimensional Printing

Abstract The convergence of 3D printing techniques and nanomaterials is generating a compelling opportunity space to create advanced materials with multiscale structural control and hierarchical functionalities. While most nanoparticles consist of a dense material, less attention has been payed to 3D printing of nanoparticles with intrinsic porosity. Here, we combine ultrasmall (about 10 nm) silica nanocages with digital light processing technique for the direct 3D printing of hierarchically porous parts with arbitrary shapes, as well as tunable internal structures and high surface area. Thanks to the versatile and orthogonal cage surface modifications, we show how this approach can be applied for the implementation and positioning of functionalities throughout 3D printed objects. Furthermore, taking advantage of the internal porosity of the printed parts, an internal printing approach is proposed for the localized deposition of a guest material within a host matrix, enabling complex 3D material designs.

scholarly journals Solvent-Free Digital Light 3D Printing using Biodegradable Polymeric Photoinitiators

2020 ◽  
Author(s):  
matthias sandmeier ◽  
nevena paunovic ◽  
Riccardo Conti ◽  
Hofmann Leopold ◽  
Jieping Wang ◽  
...  
Keyword(s):  
3D Printing ◽  
Polymeric Materials ◽  
Systematic Investigation ◽  
Tissue Scaffolds ◽  
Solvent Free ◽  
Medical Implants ◽  
Structure Property ◽  
Digital Light Processing ◽  
Structure Property Relationship ◽  
Relationship Of

<p>Vat photopolymerization 3D printing provides new</p><p>opportunities for the fabrication of tissue scaffolds and medical</p><p>devices. However, it usually requires the use of organic solvents or</p><p>diluents to dissolve the solid photoinitators, making this process</p><p>environmentally unfriendly, and not optimal for biomedical</p><p>applications. Here, we report biodegradable liquid polymeric</p><p>photoinitiators for solvent-free 3D printing of biodegradable polymeric</p><p>materials by digital light processing. These photoinitiators enable</p><p>systematic investigation of structure-property relationship of 3D</p><p>printing polymeric materials without the interference from the reactive</p><p>diluents and offer new perspectives for the solvent-free 3D additive</p><p>manufacturing of bioresorbable medical implants as well as other</p><p>functional devices.</p>

scholarly journals High-temperature Spin Crossover of a Solvent-Free Iron(II) Complex with the Linear Hexadentate Ligand [Fe(L2-3-2Ph)](AsF6)2 (L2-3-2Ph = bis[N-(1-Phenyl-1H-1,2,3-triazol-4-yl)methylidene-2-aminoethyl]-1,3- propanediamine)

2019 ◽  
Vol 5 (1) ◽  
pp. 10 ◽  
Author(s):  
Hiroaki Hagiwara
Keyword(s):  
Room Temperature ◽  
Spin Crossover ◽  
Variable Temperature ◽  
Spin Transition ◽  
Three Dimensional ◽  
Solvent Free ◽  
Supramolecular Network ◽  
Scanning Calorimetry ◽  
Mononuclear Iron ◽  
3D Network

A novel mononuclear iron(II) complex with a linear hexadentate N6 ligand, containing two 1,2,3-triazole moieties, [Fe(L2-3-2Ph)](AsF6)2 (1), was synthesized (L2-3-2Ph = bis[N-(1-Phenyl-1H-1,2,3-triazol-4-yl)methylidene-2-aminoethyl]-1,3-propanediamine). Variable-temperature magnetic susceptibility measurements revealed a gradual one-step spin crossover (SCO) between the high-spin (HS, S = 2) and low-spin (LS, S = 0) states above room temperature (T1/2 = 468 K). The spin transition was further confirmed by differential scanning calorimetry (DSC). A single-crystal X-ray diffraction study showed that the complex was in the LS state (S = 0) at room temperature (296 K). In the crystal lattice, a three-dimensional (3D) supramolecular network was formed by intermolecular CH⋯ and – interactions of neighboring complex cations [Fe(L2-3-2Ph)]2+. AsF6− ions were located interstitially in the 3D network of complex cations, with no solvent-accessible voids. The crystal structure at 448 K (mixture of HS and LS species) was also successfully determined thanks to the thermal stability of the solvent-free crystal.

scholarly journals Solvent-Free Digital Light 3D Printing using Biodegradable Polymeric Photoinitiators

2020 ◽  
Author(s):  
matthias sandmeier ◽  
nevena paunovic ◽  
Riccardo Conti ◽  
Hofmann Leopold ◽  
Jieping Wang ◽  
...  
Keyword(s):  
3D Printing ◽  
Polymeric Materials ◽  
Systematic Investigation ◽  
Tissue Scaffolds ◽  
Solvent Free ◽  
Medical Implants ◽  
Structure Property ◽  
Digital Light Processing ◽  
Structure Property Relationship ◽  
Relationship Of

<p>Vat photopolymerization 3D printing provides new</p><p>opportunities for the fabrication of tissue scaffolds and medical</p><p>devices. However, it usually requires the use of organic solvents or</p><p>diluents to dissolve the solid photoinitators, making this process</p><p>environmentally unfriendly, and not optimal for biomedical</p><p>applications. Here, we report biodegradable liquid polymeric</p><p>photoinitiators for solvent-free 3D printing of biodegradable polymeric</p><p>materials by digital light processing. These photoinitiators enable</p><p>systematic investigation of structure-property relationship of 3D</p><p>printing polymeric materials without the interference from the reactive</p><p>diluents and offer new perspectives for the solvent-free 3D additive</p><p>manufacturing of bioresorbable medical implants as well as other</p><p>functional devices.</p>

Preparation and Characterization of a Novel Room Temperature Dicationic Ionic Liquid and its Application in the Synthesis of Xanthenediones Under Solvent-Free Conditions

2018 ◽  
Vol 21 (8) ◽  
pp. 602-608 ◽  
Author(s):  
Zainab Ehsani-Nasab ◽  
Ali Ezabadi
Keyword(s):  
Ionic Liquid ◽  
Room Temperature ◽  
Reaction Times ◽  
Significant Loss ◽  
Solvent Free ◽  
Acidity Function ◽  
Efficient Catalyst ◽  
Solvent Free Conditions ◽  
Hammett Acidity Function ◽  
Dicationic Ionic Liquid

Aim and Objective: In the present work, 1, 1’-sulfinyldiethylammonium bis (hydrogen sulfate) as a novel room temperature dicationic ionic liquid was synthesized and used as a catalyst for xanthenediones synthesis. Material and Method: The dicationic ionic liquid has been synthesized using ethylamine and thionyl chloride as precursors. Then, by the reaction of [(EtNH2)2SO]Cl2 with H2SO4, [(EtNH2)2SO][HSO4]2 was prepared and after that, it was characterized by FT-IR, 1H NMR, 13C NMR as well as Hammett acidity function. This dicationic ionic liquid was used as a catalyst for the synthesis of xanthenediones via condensation of structurally diverse aldehydes and dimedone under solvent-free conditions. The progress of the reaction was monitored by thin layer chromatography (ethyl acetate/n-hexane = 3/7). Results: An efficient solvent-free method for the synthesis of xanthenediones has been developed in the presence of [(EtNH2)2SO][HSO4]2 as a powerful catalyst with high to excellent yields, and short reaction times. Additionally, recycling studies have demonstrated that the dicationic ionic liquid can be readily recovered and reused at least four times without significant loss of its catalytic activity. Conclusion: This new dicationic ionic liquid can act as a highly efficient catalyst for xanthenediones synthesis under solvent-free conditions.

Biomimetic Design of 3D Printed Tissue-engineered bone Constructs

2020 ◽  
Vol 16 ◽  
Author(s):  
Wei Liu ◽  
Shifeng Liu ◽  
Yunzhe Li ◽  
Peng Zhou ◽  
Qian ma
Keyword(s):  
Tissue Engineering ◽  
3D Printing ◽  
Advanced Materials ◽  
Bionic Design ◽  
Material Interfaces ◽  
Precise Control ◽  
Cell Printing ◽  
Biomimetic Scaffolds ◽  
3D Printed

Abstract:: Surgery to repair damaged tissue, which is caused by disease or trauma, is being carried out all the time, and a desirable treatment is compelling need to regenerate damaged tissues to further improve the quality of human health. Therefore, more and more research focus on exploring the most suitable bionic design to enrich available treatment methods. 3D-printing, as an advanced materials processing approach, holds promising potential to create prototypes with complex constructs that could reproduce primitive tissues and organs as much as possible or provide appropriate cell-material interfaces. In a sense, 3D printing promises to bridge between tissue engineering and bionic design, which can provide an unprecedented personalized recapitulation with biomimetic function under the precise control of the composition and spatial distribution of cells and biomaterials. This article describes recent progress in 3D bionic design and the potential application prospect of 3D printing regenerative medicine including 3D printing biomimetic scaffolds and 3D cell printing in tissue engineering.

scholarly journals Efficacy evaluation of three-dimensional printing assisted osteotomy guide plate in accurate osteotomy of adolescent cubitus varus deformity

2019 ◽  
Vol 14 (1) ◽  
Author(s):  
Yuan-Wei Zhang ◽  
Xin Xiao ◽  
Wen-Cheng Gao ◽  
Yan Xiao ◽  
Su-Li Zhang ◽  
...  
Keyword(s):  
3D Printing ◽  
Blood Loss ◽  
Three Dimensional ◽  
Operation Time ◽  
Varus Deformity ◽  
Conventional Group ◽  
Intraoperative Blood Loss ◽  
Cubitus Varus ◽  
Guide Plate ◽  
Significant Difference

Abstract Background This present study is aimed to retrospectively assess the efficacy of three-dimensional (3D) printing assisted osteotomy guide plate in accurate osteotomy of adolescent cubitus varus deformity. Material and methods Twenty-five patients (15 males and 10 females) with the cubitus varus deformity from June 2014 to December 2017 were included in this study and were enrolled into the conventional group (n = 11) and 3D printing group (n = 14) according to the different surgical approaches. The operation time, intraoperative blood loss, osteotomy degrees, osteotomy end union time, and postoperative complications between the two groups were observed and recorded. Results Compared with the conventional group, the 3D printing group has the advantages of shorter operation time, less intraoperative blood loss, higher rate of excellent correction, and higher rate of the parents’ excellent satisfaction with appearance after deformity correction (P < 0.001, P < 0.001, P = 0.019, P = 0.023). Nevertheless, no significant difference was presented in postoperative carrying angle of the deformed side and total complication rate between the two groups (P = 0.626, P = 0.371). Conclusions The operation assisted by 3D printing osteotomy guide plate to correct the adolescent cubitus varus deformity is feasible and effective, which might be an optional approach to promote the accurate osteotomy and optimize the efficacy.

scholarly journals Crystal structure of K[Hg(SCN)3] – a redetermination

2014 ◽  
Vol 70 (9) ◽  
pp. i46-i46 ◽  
Author(s):  
Matthias Weil ◽  
Thomas Häusler
Keyword(s):  
Crystal Structure ◽  
Room Temperature ◽  
Three Dimensional ◽  
Lattice Parameters ◽  
Bond Lengths ◽  
Dimensional Network ◽  
Anisotropic Displacement Parameters ◽  
Precision And Accuracy ◽  
Standard Deviations ◽  
Atomic Coordinates

The crystal structure of the room-temperature modification of K[Hg(SCN)3], potassium trithiocyanatomercurate(II), was redetermined based on modern CCD data. In comparison with the previous report [Zhdanov & Sanadze (1952).Zh. Fiz. Khim.26, 469–478], reliability factors, standard deviations of lattice parameters and atomic coordinates, as well as anisotropic displacement parameters, were revealed for all atoms. The higher precision and accuracy of the model is, for example, reflected by the Hg—S bond lengths of 2.3954 (11), 2.4481 (8) and 2.7653 (6) Å in comparison with values of 2.24, 2.43 and 2.77 Å. All atoms in the crystal structure are located on mirror planes. The Hg2+cation is surrounded by four S atoms in a seesaw shape [S—Hg—S angles range from 94.65 (2) to 154.06 (3)°]. The HgS4polyhedra share a common S atom, building up chains extending parallel to [010]. All S atoms of the resulting1∞[HgS2/1S2/2] chains are also part of SCN−anions that link these chains with the K+cations into a three-dimensional network. The K—N bond lengths of the distorted KN7polyhedra lie between 2.926 (2) and 3.051 (3) Å.

scholarly journals Three-dimensional(3D) printing in forensic science–An emerging technology in India

2021 ◽  
Vol 1 ◽  
pp. 100006
Author(s):  
Gargi Jani ◽  
Abraham Johnson ◽  
Jeidson Marques ◽  
Ademir Franco
Keyword(s):  
3D Printing ◽  
Forensic Science ◽  
Three Dimensional ◽  
Emerging Technology
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