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https://www.readbyqxmd.com/read/28731224/extremely-low-density-and-super-compressible-graphene-cellular-materials
#1
Ling Qiu, Bing Huang, Zijun He, Yuanyuan Wang, Zhiming Tian, Jefferson Zhe Liu, Kun Wang, Jingchao Song, Thomas R Gengenbach, Dan Li
Development of extremely low density graphene elastomer (GE) holds the potential to enable new properties that traditional cellular materials cannot offer, which are promising for a range of emerging applications, ranging from flexible electronics to multifunctional scaffolds. However, existing graphene foams with extremely low density are generally found to have very poor mechanical resilience. It is scientifically intriguing but remains unresolved whether and how the density limit of this class of cellular materials can be further pushed down while their mechanical resilience is being retained...
July 21, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28727416/in-situ-electrochemical-sensing-and-real-time-monitoring-live-cells-based-on-freestanding-nanohybrid-paper-electrode-assembled-from-3d-functionalized-graphene-framework
#2
Yan Zhang, Jian Xiao, Qi-Ying Lv, Lu Wang, Xulin Dong, Muhammad Asif, Jinghua Ren, Wenshan He, Yimin Sun, Fei Xiao, Shuai Wang
In this work, we develop a new type of freestanding nanohybrid paper electrode assembled from 3D ionic liquid (IL) functionalized graphene framework (GF) decorated by gold nanoflowers (AuNFs), and explore its practical application in in-situ electrochemical sensing of live breast cell samples by real-time tracking biomarker H2O2 released from cells. The AuNFs modified IL functionalized GF (AuNFs/IL-GF) was synthesized via a facile and efficient dopamine assisted one-pot self-assembly strategy. The as-obtained nanohybrid assembly exhibits a typical 3D hierarchical porous structure, where the highly active electrocatalyst AuNFs are well dispersed on IL-GF scaffold...
July 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28720867/graphene-microfiber-as-a-scaffold-for-regulation-of-neural-stem-cells-differentiation
#3
Weibo Guo, Jichuan Qiu, Jingquan Liu, Hong Liu
We report the cytocompatibility and regulating effects of the nanostructured reduced graphene oxide (rGO) microfibers, which are synthesized through a capillary hydrothermal method, on neural differentiation of neural stem cells (NSCs). Our findings indicate that the flexible, mechanically strong, surface nanoporous, biodegradable, and cytocompatible nanostructured rGO microfibers not only offer a more powerful substrate for NSCs adhesion and proliferation compared with 2D graphene film and tissue cluture plate but also regulate the NSCs differentiation into neurons and form a dense neural network surrounding the microfiber...
July 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28715228/mid-infrared-plasmonic-circular-dichroism-generated-by-graphene-nanodisk-assemblies
#4
Xiang-Tian Kong, Runbo Zhao, Zhiming Wang, Alexander O Govorov
It is very interesting to bring plasmonic circular dichroism spectroscopy to the mid-infrared spectral interval, and there are two reasons for this. This spectral interval is very important for thermal bioimaging, and simultaneously, this spectral range includes vibrational lines of many chiral biomolecules. Here we demonstrate that graphene plasmons indeed offer such opportunity. In particular, we show that chiral graphene assemblies consisting of a few graphene nanodisks can generate strong circular dichroism (CD) in the mid-infrared interval...
July 20, 2017: Nano Letters
https://www.readbyqxmd.com/read/28691869/composite-electrospun-nanofibers-of-reduced-graphene-oxide-grafted-with-poly-3-dodecylthiophene-and-poly-3-thiophene-ethanol-and-blended-with-polycaprolactone
#5
Raana Sarvari, Somaye Sattari, Bakhshali Massoumi, Samira Agbolaghi, Younes Beygi-Khosrowshahi, Amir Kahaie-Khosrowshahi
In this paper, an effective method was employed for preparation of nanofibers using conducting polymer-functionalized reduced graphene oxide (rGO). First, graphene oxide (GO) was obtained from graphite by Hommer method. GO was reduced to rGO by NaBH4 and covalently functionalized with a 3-thiophene acetic acid (TAA) by an esterification reaction to reach 3-thiophene acetic acid-functionalized reduced graphene oxide macromonomer (rGO-f-TAAM). Afterward, rGO-f-TAAM was copolymerized with 3-dodecylthiophene (3DDT) and 3-thiophene ethanol (3TEt) to yield rGO-f-TAA-co-PDDT (rGO-g-PDDT) and rGO-f-TAA-co-P3TEt (rGO-g-PTEt), which were confirmed by Fourier transform infrared spectra...
July 20, 2017: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/28691792/high-performance-li-se-batteries-enabled-by-selenium-storage-in-bottom-up-synthesized-nitrogen-doped-carbon-scaffolds
#6
Hongling Lv, Renpeng Chen, Xiaoqi Wang, Yi Hu, Yanrong Wang, Tao Chen, Lianbo Ma, Guoyin Zhu, Jia Liang, Zuoxiu Tie, Jie Liu, Zhong Jin
Selenium (Se) has great promise to serve as cathode material for rechargeable batteries, owing to the good conductivity and high theoretical volumetric energy density comparable to sulfur. Herein, we report the preparation of mesoporous nitrogen-doped carbon scaffolds (NCSs) to restrain selenium for advanced lithium-selenium (Li-Se) batteries. The NCSs synthesized by a bottom-up solution-phase method have graphene-like laminar structure and well-distributed mesopores. The unique architecture of NCSs can severe as conductive framework for encapsulating selenium and polyselenides, and provide sufficient pathways to facilitate ion transport...
July 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28677847/physicochemical-characteristics-of-pristine-and-functionalized-graphene
#7
Shawn E Bourdo, Radwan Al Faouri, Robert Sleezer, Zeid A Nima, Andersen Lafont, Bijay P Chhetri, Mourad Benamara, Betty Martin, Gregory J Salamo, Alexandru S Biris
Graphene-based nanomaterials have received significant attention in the last decade due to their interesting properties. Its electrical and thermal conductivity and strength make graphene well suited for a variety of applications, particularly for use as a composite material in plastics. Furthermore, much work is taking place to utilize graphene as a biomaterial for uses such as drug delivery and tissue regeneration scaffolds. Owing to the rapid progress of graphene and its potential in many marketplaces, the potential toxicity of these materials has garnered attention...
July 5, 2017: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/28663938/microplasma-assisted-hydrogel-fabrication-a-novel-method-for-gelatin-graphene-oxide-nano-composite-hydrogel-synthesis-for-biomedical-application
#8
Mantosh Kumar Satapathy, Wei-Hung Chiang, Er-Yuan Chuang, Chih-Hwa Chen, Jia-Liang Liao, Huin-Ning Huang
Toxicity issues and biocompatibility concerns with traditional classical chemical cross-linking processes prevent them from being universal approaches for hydrogel fabrication for tissue engineering. Physical cross-linking methods are non-toxic and widely used to obtain cross-linked polymers in a tunable manner. Therefore, in the current study, argon micro-plasma was introduced as a neutral energy source for cross-linking in fabrication of the desired gelatin-graphene oxide (gel-GO) nanocomposite hydrogel scaffolds...
2017: PeerJ
https://www.readbyqxmd.com/read/28657493/three-dimensional-graphene-oxide-coated-polyurethane-foams-beneficial-to-myogenesis
#9
Yong Cheol Shin, Seok Hee Kang, Jong-Ho Lee, Bongju Kim, Suck Won Hong, Dong-Wook Han
The development of three dimensional (3D) scaffolds for promoting and stimulating cell growth is one of the greatest concerns in biomedical and tissue engineering. In the present study, novel biomimetic 3D scaffolds composed of polyurethane (PU) foam and graphene oxide (GO) nanosheets were designed, and their potentials as 3D scaffolds for skeletal tissue regeneration was explored. The GO-coated PU foams (GO-PU foams) were characterized by scanning electron microscopy and Raman spectroscopy. It was revealed that the 3D GO-PU foams consisted of an interconnected foam-like network structure with an approximate 300 μm pore size, and the GO was uniformly distributed in the PU foams...
June 28, 2017: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/28634611/micro-and-nano-patterned-conductive-graphene-peg-hybrid-scaffolds-for-cardiac-tissue-engineering
#10
Alec S T Smith, Hyok Yoo, Hyunjung Yi, Eun Hyun Ahn, Justin H Lee, Guozheng Shao, Ekaterina Nagornyak, Michael A Laflamme, Charles E Murry, Deok-Ho Kim
A lack of electrical conductivity and structural organization in currently available biomaterial scaffolds limits their utility for generating physiologically representative models of functional cardiac tissue. Here we report on the development of scalable, graphene-functionalized topographies with anisotropic electrical conductivity for engineering the structural and functional phenotypes of macroscopic cardiac tissue constructs. Guided by anisotropic electroconductive and topographic cues, the tissue constructs displayed structural property enhancement in myofibrils and sarcomeres, and exhibited significant increases in the expression of cell-cell coupling and calcium handling proteins, as well as in action potential duration and peak calcium release...
June 29, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28633526/reduced-graphene-oxide-poly-acrylic-acid-aerogels-as-a-three-dimensional-replacement-for-metal-foil-current-collectors-in-lithium-ion-batteries
#11
Han Xiao, Joshua P Pender, Mackenzie A Meece-Rayle, J Pedro de Souza, Kyle C Klavetter, Heonjoo Ha, Jie Lin, Adam Heller, Christopher J Ellison, C Buddie Mullins
We report the synthesis and properties of a low-density (∼5 mg/cm(3)) and highly porous (99.6% void space) three-dimensional reduced graphene oxide (rGO)/poly(acrylic acid) (PAA) nanocomposite aerogel as the scaffold for cathode materials in lithium-ion batteries (LIBs). The rGO-PAA is both simple and starts from readily available graphite and PAA, thereby providing a scalable fabrication procedure. The scaffold can support as much as a 75 mg/cm(2) loading of LiFePO4 (LFP) in a ∼430 μm thick layer, and the porosity of the aerogel is tunable by compression; the flexible aerogel can be compressed 30-fold (i...
July 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28631614/3d-printed-bioceramic-scaffolds-with-antibacterial-and-osteogenic-activity
#12
Yongliang Zhang, Dong Zhai, Mengchi Xu, Qingqiang Yao, Huiying Zhu, Jiang Chang, Chengtie Wu
Bacterial infection poses a significant risk with the wide application of bone graft materials. Designing bone grafts with good antibacterial performance and excellent bone-forming activity is of particular significance for bone tissue engineering. In our study, a 3D printing method was used to prepare β-tricalcium phosphate (β-TCP) bioceramic scaffolds. Silver (Ag) nanoparticles were uniformly dispersed on graphene oxide (GO) to form a homogeneous nanocomposite (named Ag@GO) with different Ag-to-graphene oxide mass ratios, with this being synthesized via the liquid chemical reduction approach...
June 20, 2017: Biofabrication
https://www.readbyqxmd.com/read/28629024/electrospun-silk-fibroin-scaffolds-coated-with-reduced-graphene-promote-neurite-outgrowth-of-pc-12-cells-under-electrical-stimulation
#13
Salvador Aznar-Cervantes, Ana Pagán, Jose G Martínez, Antonia Bernabeu-Esclapez, Toribio F Otero, Luis Meseguer-Olmo, Juan I Paredes, Jose L Cenis
Novel approaches to neural research require biocompatible materials capable to act as electrode structures or scaffolds for tissue engineering in order to stimulate or restore the functionality of damaged tissues. This work offers promising results that indicate the potential use of electrospun silk fibroin (SF) scaffolds coated with reduced graphene oxide (rGO) in this sense. The coated material becomes conductor and electroactive. A complete characterisation of SF/rGO scaffolds is provided in terms of electrochemistry, mechanical behaviour and chemical conformation of fibroin...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28607818/physical-and-electrical-characterization-of-texaspeg-an-electrically-conductive-neuronal-scaffold
#14
William K A Sikkema, Andrew B Metzger, Tuo Wang, James M Tour
BACKGROUND: Graphene and its derivatives have been shown to be biocompatible and electrically active materials upon which neurons readily grow. The fusogen poly(ethylene glycol) (PEG) has been shown to improve outcomes after cervical and dorsal spinal cord transection. The long and narrow PEGylated graphene nanoribbon stacks (PEG-GNRs) with their 5 μm × 200 nm × 10 nm dimensions can provide a scaffold upon which neurons can grow and fuse. We disclose here the extensive characterization data for the PEG-GNRs...
2017: Surgical Neurology International
https://www.readbyqxmd.com/read/28607223/graphene-oxide-improves-the-biocompatibility-of-collagen-membranes-in-an-in-vitro-model-of-human-primary-gingival-fibroblasts
#15
Patrizia De Marco, Susi Zara, Marianna De Colli, Milena Radunovic, Vladimir Lazovic, Valeria Ettorre, Antonello Di Crescenzo, Adriano Piattelli, Amelia Cataldi, Antonella Fontana
Commercial collagen membranes are used in oral surgical procedures as scaffolds for bone deposition in guided bone regeneration. Here, we have enriched them with graphene oxide (GO) via a simple non-covalent functionalization and exploiting the capacity of oxygenated carbon functional moieties of GO to interact through hydrogen bonding with collagene. In the present paper, the GO-coated membranes have been characterized in terms of stability, nano-roughness, biocompatibility and induction of inflammatory response towards HGFs cells...
June 13, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/28579877/the-application-of-graphene-oxidized-combining-with-decellularized-scaffold-to-repair-of-sciatic-nerve-injury-in-rats
#16
Qiaoling Wang, Jinlong Chen, Qingfei Niu, Xiumei Fu, Xiaohong Sun, Xiaojie Tong
This paper combined the decellularized scaffold of sciatic nerve of rats with graphene oxidized (GO), studied and facilitated the regeneration of sciatic nerve of rats, and provided the basis for the clinical application of nanomaterials. GO was prepared through improving Hammer's Method. Fourier Infrared Spectrum was used to scan and detect the functional groups in GO of sample by using the pellet method, the microcosmic morphological appearance of GO was observed by using the scanning electron microscope...
May 2017: Saudi Pharmaceutical Journal: SPJ: the Official Publication of the Saudi Pharmaceutical Society
https://www.readbyqxmd.com/read/28579435/graphene-nanoparticles-as-osteoinductive-and-osteoconductive-platform-for-stem-cell-and-bone-regeneration
#17
Hoda Elkhenany, Shawn Bourdo, Silke Hecht, Robert Donnell, David Gerard, Ramadan Abdelwahed, Andersen Lafont, Karrer Alghazali, Fumiya Watanabe, Alexandru S Biris, David Anderson, Madhu Dhar
The potential of graphene-based nanoparticles (GNPs) has recently gained significant attention in biomedicine, especially in tissue engineering. In this study, we investigated the osteoinductive and osteoconductive effects of low oxygen content graphene (LOG) nanoparticles on adult mesenchymal stem cells (MSCs) in vitro and in vivo. We showed that adult goat MSCs were viable in the presence of 0.1 mg/mL LOG and retained their stem cell properties. A 3D scaffold made from agarose was used to encapsulate MSCs and LOG nanoparticles...
June 1, 2017: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/28556473/flyweight-superelastic-electrically-conductive-and-flame-retardant-3d-multi-nanolayer-graphene-ceramic-metamaterial
#18
Qiangqiang Zhang, Dong Lin, Biwei Deng, Xiang Xu, Qiong Nian, Shengyu Jin, Kevin D Leedy, Hui Li, Gary J Cheng
A ceramic/graphene metamaterial (GCM) with microstructure-derived superelasticity and structural robustness is achieved by designing hierarchical honeycomb microstructures, which are composited with two brittle constituents (graphene and ceramic) assembled in multi-nanolayer cellular walls. Attributed to the designed microstructure, well-interconnected scaffolds, chemically bonded interface, and coupled strengthening effect between the graphene framework and the nanolayers of the Al2 O3 ceramic (NAC), the GCM demonstrates a sequence of multifunctional properties simultaneously that have not been reported for ceramics and ceramics-matrix-composite structures, such as flyweight density, 80% reversible compressibility, high fatigue resistance, high electrical conductivity, and excellent thermal-insulation/flame-retardant performance simultaneously...
May 29, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28549588/graphene-modified-titanium-alloy-promote-the-adhesion-proliferation-and-osteogenic-differentiation-of-bone-marrow-stromal-cells
#19
Kewen Li, Jinhong Yan, Chunhui Wang, Long Bi, Qi Zhang, Yisheng Han
We studied the effects of graphene coating on improving the biological activity of a titanium alloy (Ti6Al4V) widely used in hip and knee joint replacements. The experiments included immunofluorescence staining for observing cellular adhesion, Cell Counting Kit-8 (CCK-8) for evaluating cellular proliferation and reverse transcription-polymerase chain reaction (RT-PCR) for detecting the differentiation of bone marrow stromal cells on different scaffolds. The results showed that G-Ti6Al4V exhibited a higher mean integrated optical density (IOD) for vinculin and resulted in a higher cell proliferation rate and higher osteoblast-specific gene transcription levels...
May 23, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28545299/designing-pseudocapacitance-for-nb2o5-carbide-derived-carbon-electrodes-and-hybrid-devices
#20
Chun-Han Lai, David Ashby, Melissa K Moz, Yury Gogotsi, Laurent Pilon, Bruce S Dunn
Composite structures for electrochemical energy storage are prepared based on using the high rate lithium-ion insertion properties of Nb2O5. The Nb2O5 anchored on reduced graphene oxide (rGO) by hydrothermal synthesis to improve charge transfer properties and, by controlling surface charge, the resulting Nb2O5-rGO particles are attached to a high surface area carbide-derived carbon scaffold without blocking its exfoliated layers. The electrochemical results are analyzed using a recently published multi-scale physics model that provides significant insights regarding charge storage kinetics...
May 25, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
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