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https://www.readbyqxmd.com/read/28545299/designing-pseudocapacitance-for-nb2o5-carbide-derived-carbon-electrodes-and-hybrid-devices
#1
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
https://www.readbyqxmd.com/read/28541125/electrically-conductive-borate-based-bioactive-glass-scaffolds-for-bone-tissue-engineering-applications
#2
Mert Turk, Aylin M Deliormanlı
In this study, electrically conductive, borate-based, porous 13-93B3 bioactive glass composite scaffolds were prepared using a polymer foam replication technique. For this purpose, a slurry containing 40 vol% glass particles and 0-10 wt% graphene nanoplatelets was prepared by dispersing the particles in ethanol in the presence of ethyl cellulose. Composite scaffolds were subjected to a controlled heat treatment, in air atmosphere, to decompose the foam and sinter the glass particles into a dense network...
January 1, 2017: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/28520218/lithium-bond-chemistry-in-lithium-sulfur-batteries
#3
Ting-Zheng Hou, Wen-Tao Xu, Xiang Chen, Hong-Jie Peng, Jia-Qi Huang, Qiang Zhang
Lithium-sulfur (Li-S) battery is a promising high-energy-density energy storage system. The strong anchoring of intermediates is widely accepted to retard the shuttle of polysulfides in a working battery. However, the understanding of the intrinsic chemistry is still deficient. Inspired by the concept of hydrogen bond, herein we focus on the Li bond chemistry in Li-S batteries through sophisticated quantum chemical calculations, in combination with 7Li nuclear magnetic resonance (NMR). Identified as Li bond, the strong dipole-dipole interaction between Li polysulfides and Li-S cathode materials originates from the electron-rich donors (e...
May 18, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28501710/carbon-nanotubes-graphene-and-boron-nitride-nanotubes-reinforced-bioactive-ceramics-for-bone-repair
#4
REVIEW
Chengde Gao, Pei Feng, Shuping Peng, Cijun Shuai
The high brittleness and low strength of bioactive ceramics severely restricted their applications in bone repair despite they have been regarded as the most promising biomaterials. In the last few years, low-dimensional nanomaterials (LDNs), including carbon nanotubes, graphene and boron nitride nanotubes, have gained increasing attention owing to the favorable biocompatibility, large surface specific area and super mechanical properties, which makes LDNs potential nanofillers in reinforcing bioactive ceramics...
May 10, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28495017/graphene-for-the-development-of-the-next-generation-of-biocomposites-for-dental-and-medical-applications
#5
REVIEW
Han Xie, Tong Cao, Francisco Javier Rodríguez-Lozano, Emma Kim Luong-Van, Vinicius Rosa
OBJECTIVE: Graphene and its derivatives, graphene oxide (GO) and reduced graphene oxide (rGO), are 2D carbon-based materials with remarkable physical, chemical and biological properties. Graphene sheets have high specific surface area and mechanical strength. Moreover, they have been shown to influence the differentiation of stem cells and to improve properties of biomaterials. METHODS: Here, we present the recent achievements on the use of graphene and its derivatives to improve properties and enhance bioactivity of biomaterials...
May 8, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28474863/freestanding-gold-graphene-oxide-manganese-oxide-microsupercapacitor-displaying-high-areal-energy-density
#6
Ahiud Morag, James Y Becker, Raz Jelinek
Microsupercapacitors are touted as one of the promising "next frontiers" in energy-storage research and applications. Despite their potential, significant challenges still exist in terms of physical properties and electrochemical performance, particularly attaining high energy density, stability, ease of synthesis, and feasibility of large-scale production. We present new freestanding microporous electrodes comprising self-assembled scaffold of gold and reduced graphene oxide (rGO) nanowires coated with MnO2 ...
May 5, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28464356/facile-assembly-of-3d-porous-reduced-graphene-oxide-ultrathin-mno2-nanosheets-s-aerogels-as-efficient-polysulfide-adsorption-sites-for-high-performance-lithium-sulfur-batteries
#7
Xiaojun Zhao, Hui Wang, Gaohong Zhai, Gang Wang
Rechargeable lithium-sulfur (Li-S) batteries are receiving much attention due to their high specific capacity, low cost, and environmental friendliness. Nonetheless, fast capacity decay and low specific capacity still limit their practical implementation. Herein, we report a facile strategy to overcome these challenges by the design and fabrication of 3D porous reduced graphene oxide/ultrathin MnO2 nanosheets-S aerogel (rGM-SA) composites for Li-S batteries. By a simple solvothermal reaction process, nanosized S atoms are homogeneously decorated into the 3D scaffold formed by reduced graphene oxide (rGO) and MnO2 nanosheets, which can form the homogeneous rGM-SA composites...
May 23, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28442269/enhanced-adhesion-and-in-situ-photothermal-ablation-of-cancer-cells-in-surface-functionalized-electrospun-microfiber-scaffold-with-graphene-oxide
#8
Nicolò Mauro, Cinzia Scialabba, Giovanna Pitarresi, Gaetano Giammona
The physicochemical characteristics of a biomaterial surface highly affect the interaction with living cells. Recently, much attention has been focused on the adhesion properties of functional biomaterials toward cancer cells, since is expected to control metastatic spread of a tumor, which is related to good probability containing the progression of disease burden. Here, we designed an implantable poly(caprolactone)-based electrospun microfiber scaffold, henceforth PCLMF-GO, to simultaneously capture and kill cancer cells by tuning physicochemical features of the hybrid surface through nitrogen plasma activation and hetero-phase graphene oxide (GO) covalent functionalization...
April 23, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28433056/discriminative-sensing-of-dopa-enantiomers-by-cyclodextrin-anchored-graphene-nanohybrids
#9
Salih Ates, Erhan Zor, Ilker Akin, Haluk Bingol, Sabri Alpaydin, Emine G Akgemci
Discriminative sensing of chiral species with a convenient and robust system is a challenge in chemistry, pharmaceutics and particularly in biomedical science. Advanced nanohybrid materials for discrimination of these biologically active molecules can be developed by combination of individual obvious advantages of different molecular scaffolds. Herein, we report on the comparison of the performance of cyclodextrin functionalized graphene derivatives (x-CD/rGO, x: α-, β-, γ-) for discrimination of DOPA enantiomers...
June 1, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28425470/graphene-oxide-as-an-interface-phase-between-polyetheretherketone-and-hydroxyapatite-for-tissue-engineering-scaffolds
#10
Shuping Peng, Pei Feng, Ping Wu, Wei Huang, Youwen Yang, Wang Guo, Chengde Gao, Cijun Shuai
The poor bonding strength between biopolymer and bioceramic has remained an unsolved issue. In this study, graphene oxide (GO) was introduced as an interface phase to improve the interfacial bonding between polyetheretherketone (PEEK) and hydroxyapatite (HAP) for tissue engineering scaffolds. On the one hand, the conjugated structure of GO could form strong π-π stacking interaction with the benzene rings in PEEK. On the other hand, GO with a negatively charge resulting from oxygen functional groups could adsorb the positively charged calcium atoms (C sites) of HAP...
April 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28415403/design-and-synthesis-of-reduced-graphene-oxide-based-supramolecular-scaffold-a-benign-microbial-resistant-network-for-enzyme-immobilization-and-cell-growth
#11
Maloy Kr Mondal, Suprabhat Mukherjee, Swadhin K Saha, Pranesh Chowdhury, Santi P Sinha Babu
The present study describes the synthesis, characterization and biological application of reduced graphene oxide - chitosan (GC) based benign supramolecular scaffold (SMS). Various spectroscopic and microscopic analyses established the supramolecular interaction in between rGO and chitosan. The active performance of the developed material towards microbial resistivity, in vitro cell growth and as a scaffold for enzyme immobilizing matrix illustrates its unique implementation. Immobilization of polyphenol oxidase (PPO) onto GC lowers the Michaelis- Menten constant (Km) value and facilitates to achieve maximum velocity at low substrate concentration...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28406027/gelatin-derived-graphene-silicate-hybrid-materials-are-biocompatible-and-synergistically-promote-bmp9-induced-osteogenic-differentiation-of-mesenchymal-stem-cells
#12
Yulong Zou, Nader Taheri Qazvini, Kylie Zane, Monirosadat Sadati, Qiang Wei, Junyi Liao, Jiaming Fan, Dongzhe Song, Jianxiang Liu, Chao Ma, Xiangyang Qu, Liqun Chen, Xinyi Yu, Zhicai Zhang, Chen Zhao, Zongyue Zeng, Ruyi Zhang, Shujuan Yan, Tingting Wu, Xingye Wu, Yi Shu, Yasha Li, Wenwen Zhang, Russell R Reid, Michael J Lee, Jennifer Moritis Wolf, Matthew Tirrell, Tong-Chuan He, Juan J de Pablo, Zhong-Liang Deng
Graphene-based materials are used in many fields but have found only limited applications in biomedicine, including bone tissue engineering. Here, we demonstrate that novel hybrid materials consisting of gelatin-derived graphene and silicate nanosheets of Laponite (GL) are biocompatible and promote osteogenic differentiation of mesenchymal stem cells (MSCs). Homogeneous cell attachment, long-term proliferation, and osteogenic differentiation of MSCs on a GL-scaffold were confirmed using optical microscopy and scanning electron microscopy...
May 4, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28378997/flyweight-3d-graphene-scaffolds-with-microinterface-barrier-derived-tunable-thermal-insulation-and-flame-retardancy
#13
Qiangqiang Zhang, Menglong Hao, Xiang Xu, Guoping Xiong, Hui Li, Timothy S Fisher
In this article, flyweight three-dimensional (3D) graphene scaffolds (GSs) have been demonstrated with a microinterface barrier-derived thermal insulation and flame retardancy characteristics. Such 3D GSs were fabricated by a modified hydrothermal method and a unidirectional freeze-casting process with hierarchical porous microstructures. Because of high porosity (99.9%), significant phonon scattering, and strong π-π interaction at the interface barriers of multilayer graphene cellular walls, the GSs demonstrate a sequence of multifunctional properties simultaneously, such as lightweight density, thermal insulating characteristics, and outstanding mechanical robustness...
April 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28350456/starch-derived-nanographene-oxide-paves-the-way-for-electrospinnable-and-bioactive-starch-scaffolds-for-bone-tissue-engineering
#14
Duo Wu, Archana Samanta, Rajiv K Srivastava, Minna Hakkarainen
A straightforward process that enabled electrospinning of bioactive starch-based nanofiber scaffolds was developed by utilizing starch derived nano graphene oxide (nGO) as a property enhancer and formic acid as a solvent and esterification reagent. The reaction mechanism and process were followed by detailed spectroscopic investigation. Furthermore, the incorporation of nGO as a "green bioactive additive" endorsed starch nanofibrous scaffolds several advantageous functionalities including improved electrospinnability and thermal stability, good cytocompatibility, osteo-bioactivity, and retained biodegradability...
March 31, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28269209/three-dimensional-graphene-scaffold-for-cardiac-tissue-engineering-and-in-situ-electrical-recording
#15
S K Ameri, P K Singh, R D'Angelo, W Stoppel, L Black, S R Sonkusale
In this paper, we present a three-dimensional graphene foam made of few layers of CVD grown graphene as a scaffold for growing cardiac cells and recording their electrical activity. Our results show that graphene foam not only provides an excellent extra-cellular matrix (ECM) for the culture of such electrogenic cells but also enables recording of its extracellular electrical activity in-situ. Recording is possible due to graphene's excellent conductivity. In this paper, we present our results on the fabrication of the graphene scaffold and initial studies on the culture of cardiac cell lines such as HL-1 and recording of their real-time electrical activity...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227439/three-dimensional-graphene-scaffold-for-cardiac-tissue-engineering-and-in-situ-electrical-recording
#16
S K Ameri, P K Singh, R D'Angelo, W Stoppel, L Black, S R Sonkusale, S K Ameri, P K Singh, R D'Angelo, W Stoppel, L Black, S R Sonkusale, L Black, P K Singh, W Stoppel, S R Sonkusale, R D'Angelo, S K Ameri
In this paper, we present a three-dimensional graphene foam made of few layers of CVD grown graphene as a scaffold for growing cardiac cells and recording their electrical activity. Our results show that graphene foam not only provides an excellent extra-cellular matrix (ECM) for the culture of such electrogenic cells but also enables recording of its extracellular electrical activity in-situ. Recording is possible due to graphene's excellent conductivity. In this paper, we present our results on the fabrication of the graphene scaffold and initial studies on the culture of cardiac cell lines such as HL-1 and recording of their real-time electrical activity...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28186395/graphene-scaffolded-na3v2-po4-3-microsphere-cathode-with-high-rate-capability-and-cycling-stability-for-sodium-ion-batteries
#17
Jiexin Zhang, Yongjin Fang, Lifen Xiao, Jiangfeng Qian, Yuliang Cao, Xinping Ai, Hanxi Yang
High voltage, high rate, and cycling-stable cathodes are urgently needed for development of commercially viable sodium ion batteries (SIBs). Herein, we report a facile spray-drying method to synthesize graphene-scaffolded Na3V2(PO4)3 microspheres (NVP@rGO), in which nanocrystalline Na3V2(PO4)3 is embedded in graphene sheets to form porous microspheres. Benefiting from the highly conductive graphene framework and porous structure, the NVP@rGO material exhibits a high reversible capacity (115 mAh g(-1) at 0.2 C), long-term cycle life (81% of capacity retention up to 3000 cycles at 5 C), and excellent rate performance (44 mAh g(-1) at 50 C)...
March 1, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28186213/multifunctional-biocompatible-and-ph-responsive-carbon-nanotube-and-graphene-oxide-tectomer-hybrid-composites-and-coatings
#18
Rosa Garriga, Izabela Jurewicz, Shayan Seyedin, Niki Bardi, Stella Totti, Brigitta Matta-Domjan, Eirini G Velliou, Mohammed A Alkhorayef, Vicente L Cebolla, Joselito M Razal, Alan B Dalton, Edgar Muñoz
Here we present a route for non-covalent functionalization of carboxylated multi-walled carbon nanotubes and graphene oxide with novel two-dimensional peptide assemblies. We show that self-assembled amino-terminated biantennary and tetraantennary oligoglycine peptides (referred to as tectomers) effectively coat carboxylated multi-walled carbon nanotubes and also strongly interact with graphene oxide due to electrostatic interactions and hydrogen bonding as the driving force, respectively. The resulting hybrids can be made into free-standing conducting composites or applied in the form of thin, pH-switchable bioadhesive coatings onto graphene oxide fibers...
February 10, 2017: Nanoscale
https://www.readbyqxmd.com/read/28183613/pdlla-honeycomb-like-scaffolds-with-a-high-loading-of-superhydrophilic-graphene-multi-walled-carbon-nanotubes-promote-osteoblast-in-vitro-functions-and-guided-in-vivo-bone-regeneration
#19
Edmundo Silva, Luana Marotta Reis de Vasconcellos, Bruno V M Rodrigues, Danilo Martins Dos Santos, Sergio P Campana-Filho, Fernanda Roberta Marciano, Thomas J Webster, Anderson Oliveira Lobo
Herein, we developed honeycomb-like scaffolds by combining poly (d, l-lactic acid) (PDLLA) with a high amount of graphene/multi-walled carbon nanotube oxides (MWCNTO-GO, 50% w/w). From pristine multi-walled carbon nanotubes (MWCNT) powders, we produced MWCNTO-GO via oxygen plasma etching (OPE), which promoted their exfoliation and oxidation. Initially, we evaluated PDLLA and PDLLA/MWCNTO-GO scaffolds for tensile strength tests, cell adhesion and cell viability (with osteoblast-like MG-63 cells), alkaline phosphatase (ALP, a marker of osteoblast differentiation) activity and mineralized nodule formation...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28122148/starch-derived-nanosized-graphene-oxide-functionalized-bioactive-porous-starch-scaffolds
#20
Duo Wu, Eva Bäckström, Minna Hakkarainen
A fully starch-derived bioactive 3D porous scaffold is developed. The bioactivity is introduced through nanosized graphene oxide (nGO) derived from starch by microwave-assisted degradation to carbon spheres and further oxidation to GO nanodots. nGO is covalently attached to starch to prepare functionalized starch (SNGO) via an esterification reaction. nGO and SNGO exhibit no cytotoxicity to MG63 at least up to 1000 µg mL(-1) under (3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay. Porous scaffolds consisting of starch and SNGO (S/SNGO) or nGO (S/nGO) are prepared by freeze drying...
January 25, 2017: Macromolecular Bioscience
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