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https://www.readbyqxmd.com/read/28930091/proposal-to-assess-printability-of-bioinks-for-extrusion-based-bioprinting-and-evaluation-of-rheological-properties-governing-bioprintability
#1
Naomi Claire Paxton, Willi Smolan, Thomas Böck, Ferry P W Melchels, Juergen Groll, Tomasz Juengst
The development and formulation of printable inks for extrusion-based 3D bioprinting has been a major challenge in the field of biofabrication. Inks, often polymer solutions with the addition of crosslinking to form hydrogels, must not only display adequate mechanical properties for the chosen application, but also show high biocompatibility as well as printability. Here we describe a reproducible two-step method for the assessment of the printability of inks for bioprinting, focussing firstly on screening ink formulations to assess fibre formation and the ability to form 3D constructs before presenting a method for the rheological evaluation of inks to characterise the yield point, shear thinning and recovery behaviour...
September 20, 2017: Biofabrication
https://www.readbyqxmd.com/read/28929935/development-of-arginine-glycine-aspartate-immobilized-3d-printed-poly-propylene-fumarate-scaffolds-for-cartilage-tissue-engineering
#2
Chi Bum Ahn, Youngjo Kim, Sung Jean Park, Yongsung Hwang, Jin Woo Lee
Poly(propylene fumarate) (PPF) has known to be a good candidate material for cartilage tissue regeneration because of its excellent mechanical properties during its degradation processes. Here, we describe the potential application of PPF-based materials as 3D printing bioinks to create macroporous cell scaffolds using micro-stereolithography (MSTL). To improve cell-matrix interaction of seeded human chondrocytes within the PPF-based 3D scaffolds, we immobilized arginine-glycine-aspartate (RGD) peptide onto the PPF scaffolds...
September 20, 2017: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/28914823/hole-transporting-materials-for-printable-perovskite-solar-cells
#3
REVIEW
Paola Vivo, Jagadish K Salunke, Arri Priimagi
Perovskite solar cells (PSCs) represent undoubtedly the most significant breakthrough in photovoltaic technology since the 1970s, with an increase in their power conversion efficiency from less than 5% to over 22% in just a few years. Hole-transporting materials (HTMs) are an essential building block of PSC architectures. Currently, 2,2',7,7'-tetrakis-(N,N'-di-p-methoxyphenylamine)-9,9'-spirobifluorene), better known as spiro-OMeTAD, is the most widely-used HTM to obtain high-efficiency devices. However, it is a tremendously expensive material with mediocre hole carrier mobility...
September 15, 2017: Materials
https://www.readbyqxmd.com/read/28906599/dual-extrusion-3d-printing-of-anatomical-models-for-education
#4
Michelle L Smith, James F X Jones
Two material 3D printing is becoming increasingly popular, inexpensive and accessible. In this paper, freely available printable files and dual extrusion fused deposition modelling were combined to create a number of functional anatomical models. To represent muscle and bone FilaFlex(3D) flexible filament and polylactic acid (PLA) filament were extruded respectively via a single 0.4 mm nozzle using a Big Builder printer. For each filament, cubes (5 mm(3) ) were printed and analyzed for X, Y, and Z accuracy...
September 14, 2017: Anatomical Sciences Education
https://www.readbyqxmd.com/read/28883498/the-mechanical-and-photoelastic-properties-of-3d-printable-stress-visualized-materials
#5
Li Wang, Yang Ju, Heping Xie, Guowei Ma, Lingtao Mao, Kexin He
Three-dimensional (3D) printing technology integrating frozen stress techniques has created a novel way to directly represent and characterize 3D interior discontinuities and the full-field stress induced by mining- or construction-related disturbances of deeply buried rock masses. However, concerns have been raised about the similitude between the mechanical behaviours of the printed model and its prototype rock mass. Ensuring the mechanical properties of the printable materials are as close as possible to those of real rock mass is of critical significance...
September 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28876895/3d-printing-of-photocurable-cellulose-nanocrystal-composite-for-fabrication-of-complex-architectures-via-stereolithography
#6
Napolabel Palaganas, Joey Mangadlao, Al Christopher De Leon, Jerome Palaganas, Katrina Pangilinan, Yan Jie Lee, Rigoberto Advincula
The advantages of 3D printing on cost, speed, accuracy, and flexibility have attracted several new applications in various industries especially in the field of medicine where customized solutions are highly demanded. Although this modern fabrication technique offers several benefits, it also poses critical challenges in materials development suitable for industry use. Proliferation of polymers in biomedical application has been severely limited by their inherently weak mechanical properties despite their other excellent attributes...
September 6, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28875099/surface-functionalization-of-3d-printed-plastics-via-initiated-chemical-vapor-deposition
#7
Christine Cheng, Malancha Gupta
3D printing is a useful fabrication technique because it offers design flexibility and rapid prototyping. The ability to functionalize the surfaces of 3D-printed objects allows the bulk properties, such as material strength or printability, to be chosen separately from surface properties, which is critical to expanding the breadth of 3D printing applications. In this work, we studied the ability of the initiated chemical vapor deposition (iCVD) process to coat 3D-printed shapes composed of poly(lactic acid) and acrylonitrile butadiene styrene...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28864253/engineered-potato-virus-x-nanoparticles-support-hydroxyapatite-nucleation-for-improved-bone-tissue-replacement
#8
Ines Lauria, Christina Dickmeis, Juliane Röder, Malin Beckers, Stephan Rütten, Ying Ying Lin, Ulrich Commandeur, Horst Fischer
Bionanoparticles based on filamentous phages or flexuous viruses are interesting candidates for meeting the challenges of tailoring biomineralization in hydrogel-based bone tissue substitutes. We hypothesized that hydroxyapatite crystal nucleation and matrix mineralization can be significantly increased by mineralization-inducing (MIP) and integrin binding motif (RGD) peptides presented on biomimetic nanoparticles. In this study, Potato virus X (PVX), a flexible rod-shaped plant virus was genetically engineered to present these functional peptides on its particle surface...
August 29, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28833596/room-temperature-electrochemical-sintering-of-zn-microparticles-and-its-use-in-printable-conducting-inks-for-bioresorbable-electronics
#9
Yoon Kyeung Lee, Jeonghyun Kim, Yerim Kim, Jean Won Kwak, Younghee Yoon, John A Rogers
This study describes a conductive ink formulation that exploits electrochemical sintering of Zn microparticles in aqueous solutions at room temperature. This material system has relevance to emerging classes of biologically and environmentally degradable electronic devices. The sintering process involves dissolution of a surface passivation layer of zinc oxide in CH3 COOH/H2 O and subsequent self-exchange of Zn and Zn(2+) at the Zn/H2 O interface. The chemical specificity associated with the Zn metal and the CH3 COOH/H2 O solution is critically important, as revealed by studies of other material combinations...
August 21, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28819137/precise-stacking-of-decellularized-extracellular-matrix-based-3d-cell-laden-constructs-by-a-3d-cell-printing-system-equipped-with-heating-modules
#10
Geunseon Ahn, Kyung-Hyun Min, Changhwan Kim, Jeong-Seok Lee, Donggu Kang, Joo-Yun Won, Dong-Woo Cho, Jun-Young Kim, Songwan Jin, Won-Soo Yun, Jin-Hyung Shim
Three-dimensional (3D) cell printing systems allow the controlled and precise deposition of multiple cells in 3D constructs. Hydrogel materials have been used extensively as printable bioinks owing to their ability to safely encapsulate living cells. However, hydrogel-based bioinks have drawbacks for cell printing, e.g. inappropriate crosslinking and liquid-like rheological properties, which hinder precise 3D shaping. Therefore, in this study, we investigated the influence of various factors (e.g. bioink concentration, viscosity, and extent of crosslinking) on cell printing and established a new 3D cell printing system equipped with heating modules for the precise stacking of decellularized extracellular matrix (dECM)-based 3D cell-laden constructs...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28795951/gelma-collagen-blends-enable-drop-on-demand-3d-printablility-and-promote-angiogenesis
#11
Henrike Stratesteffen, Marius Johannes Köpf, Franziska Kreimendahl, Andreas Blaeser, Stefan Jockenhoevel, Horst Fischer
Effective vascularization is crucial for three dimensional (3D) printed hydrogel-cell constructs to efficiently supply cells with oxygen and nutrients. Till date, several hydrogel blends have been developed that allow the in vitro formation of a capillary-like network within the gels but comparatively less effort has been made to improve the suitability of the materials for a 3D bioprinting process. Therefore, we hypothesize that tailored hydrogel blends of photo-crosslinkable gelatin and type I collagen exhibit favorable 3D drop-on-demand printing characteristics in terms of rheological and mechanical properties and that further capillary-like network formation can be induced by co-culturing human umbilical vein endothelial cells (HUVEC) and human mesenchymal stem cells (hMSC) within the proposed blends...
August 10, 2017: Biofabrication
https://www.readbyqxmd.com/read/28782923/fully-packaged-carbon-nanotube-supercapacitors-by-direct-ink-writing-on-flexible-substrates
#12
Bolin Chen, Yizhou Jiang, Xiaohui Tang, Yayue Pan, Shan Hu
The ability to print fully packaged integrated energy storage components (e.g., supercapacitors) is of critical importance for practical applications of printed electronics. Due to the limited variety of printable materials, most studies on printed supercapacitors focus on printing the electrode materials but rarely the full-packaged cell. This work presents for the first time the printing of a fully packaged single-wall carbon nanotube-based supercapacitor with direct ink writing (DIW) technology. Enabled by the developed ink formula, DIW setup, and cell architecture, the whole printing process is mask free, transfer free, and alignment free with precise and repeatable control on the spatial distribution of all constituent materials...
August 30, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28773918/synthesis-and-characterization-of-types-a-and-b-gelatin-methacryloyl-for-bioink-applications
#13
Bae Hoon Lee, Nathaniel Lum, Li Yuan Seow, Pei Qi Lim, Lay Poh Tan
Gelatin methacryloyl (GelMA) has been increasingly considered as an important bioink material due to its tailorable mechanical properties, good biocompatibility, and ability to be photopolymerized in situ as well as printability. GelMA can be classified into two types: type A GelMA (a product from acid treatment) and type B GelMA (a product from alkali treatment). In current literature, there is little research on the comparison of type A GelMA and type B GelMA in terms of synthesis, rheological properties, and printability for bioink applications...
September 24, 2016: Materials
https://www.readbyqxmd.com/read/28772551/polyvinylpyrrolidone-based-bio-ink-improves-cell-viability-and-homogeneity-during-drop-on-demand-printing
#14
Wei Long Ng, Wai Yee Yeong, May Win Naing
Drop-on-demand (DOD) bioprinting has attracted huge attention for numerous biological applications due to its precise control over material volume and deposition pattern in a contactless printing approach. 3D bioprinting is still an emerging field and more work is required to improve the viability and homogeneity of printed cells during the printing process. Here, a general purpose bio-ink was developed using polyvinylpyrrolidone (PVP) macromolecules. Different PVP-based bio-inks (0%-3% w/v) were prepared and evaluated for their printability; the short-term and long-term viability of the printed cells were first investigated...
February 16, 2017: Materials
https://www.readbyqxmd.com/read/28772072/a-consecutive-spray-printing-strategy-to-construct-and-integrate-diverse-supercapacitors-on-various-substrates
#15
Xinyu Wang, Qiongqiong Lu, Chen Chen, Mo Han, Qingrong Wang, Haixia Li, Zhiqiang Niu, Jun Chen
The rapid development of printable electronic devices with flexible and wearable characteristics requires supercapacitor devices to be printable, light, thin, integrated macro- and micro-devices with flexibility. Herein, we developed a consecutive spray printing strategy to controllably construct and integrate diverse supercapacitors on various substrates. In such a strategy, all supercapacitor components are fully printable, and their thicknesses and shapes are well controlled. As a result, supercapacitors obtained by this strategy achieve diverse structures and shapes...
August 30, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28758390/printable-nanocomposite-fes2-pbs-nanocrystals-graphene-heterojunction-photodetectors-for-broadband-photodetection
#16
Maogang Gong, Qingfeng Liu, Ryan Goul, Dan Ewing, Matthew Casper, Alex Stramel, Alan Elliot, Judy Z Wu
Colloidal nanocrystals are attractive materials for optoelectronics applications because they offer a compelling combination of low-cost solution processing, printability, and spectral tunability through the quantum dot size effect. Here we explore a novel nanocomposite photosensitizer consisting of colloidal nanocrystals of FeS2 and PbS with complementary optical and microstructural properties for broadband photodetection. Using a newly developed ligand exchange to achieve high-efficiency charge transfer across the nanocomposite FeS2-PbS sensitizer and graphene on the FeS2-PbS/graphene photoconductors, an extraordinary photoresponsivity in exceeding ∼10(6) A/W was obtained in an ultrabroad spectrum of ultraviolet (UV)-visible-near-infrared (NIR)...
August 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28729671/linking-rheology-and-printability-for-dense-and-strong-ceramics-by-direct-ink-writing
#17
Amin M'Barki, Lydéric Bocquet, Adam Stevenson
Direct ink writing of dense and strong ceramic objects remains an important open challenge. We develop a universal dimensionless criterion for printing such objects. Boehmite, an Al2O3 precursor, was used to assess the rheological properties leading to dense structures in ceramics manufactured by direct ink writing. Boehmite suspensions undergo time dependent gelation, thus providing a rheological laboratory of flow behaviours that can be correlated with printability requirements. We measured the evolution of rheological properties over several days and quantified the deformation of simple printed shapes at different aging times...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28723074/paper-based-bimodal-sensor-for-electronic-skin-applications
#18
Minhyun Jung, Kyungkwan Kim, Bumjin Kim, Haena Cheong, Kwanwoo Shin, Oh-Sun Kwon, Jong-Jin Park, Sanghun Jeon
We present the development of a flexible bimodal sensor using a paper platform and inkjet printing method, which are suited for low-cost fabrication processes and realization of flexible devices. In this study, we employed a vertically stacked bimodal device architecture in which a temperature sensor is stacked on top of a pressure sensor and operated on different principles, allowing the minimization of interference effects. For the temperature sensor placed in the top layer, we used the thermoelectric effect and formed a closed-loop thermocouple composed of two different printable inks (conductive PEDOT:PSS and silver nanoparticles on a flexible paper platform) and obtained temperature-sensing capability over a wide range (150 °C)...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28670353/effects-of-living-cells-on-the-bioink-printability-during-laser-printing
#19
Zhengyi Zhang, Changxue Xu, Ruitong Xiong, Douglas B Chrisey, Yong Huang
Laser-induced forward transfer has been a promising orifice-free bioprinting technique for the direct writing of three-dimensional cellular constructs from cell-laden bioinks. In order to optimize the printing performance, the effects of living cells on the bioink printability must be carefully investigated in terms of the ability to generate well-defined jets during the jet/droplet formation process as well as well-defined printed droplets on a receiving substrate during the jet/droplet deposition process...
May 2017: Biomicrofluidics
https://www.readbyqxmd.com/read/28657706/crystalline-microporous-organosilicates-with-reversed-functionalities-of-organic-and-inorganic-components-for-room-temperature-gas-sensing
#20
Barbara Fabbri, Lucia Bonoldi, Vincenzo Guidi, Giuseppe Cruciani, Davide Casotti, Cesare Malagù, Giuseppe Bellussi, Roberto Millini, Luciano Montanari, Angela Carati, Caterina Rizzo, Erica Montanari, Stefano Zanardi
A deepened investigation on an innovative organic-inorganic hybrid material, referred to as ECS-14 (where ECS = Eni carbon silicates), revealed the possibility to use them as gas sensors. Indeed, among ECS phases, the crystalline state and the hexagonal microplateletlike morphology characteristic of ECS-14 seemed favorable properties to obtain continuous and uniform films. ECS-14 phase was used as functional material in screen-printable compositions and was thus deposited by drop coating for morphological, structural, thermal, and electrical characterizations...
July 14, 2017: ACS Applied Materials & Interfaces
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