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https://www.readbyqxmd.com/read/28433056/discriminative-sensing-of-dopa-enantiomers-by-cyclodextrin-anchored-graphene-nanohybrids
#1
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
#2
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
#3
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-mscs
#4
Yulong Zou, Nader Taheri Qazvini, Kylie Zane, Monirosadat Sanaz 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 M Wolf, Matthew Tirrell, Tong-Chuan He, Juan J de Pablo, Zhong-Liang Deng
Graphene-based materials have been used in many fields but have only found 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 GL-scaffold were confirmed by optical microscopy, and scanning electron microscopy...
April 13, 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
#5
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
#6
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
#7
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
#8
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
#9
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
#10
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
#11
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
#12
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
https://www.readbyqxmd.com/read/28120875/integrated-microfluidic-flow-through-microbial-fuel-cells
#13
Huawei Jiang, Md Azahar Ali, Zhen Xu, Larry J Halverson, Liang Dong
This paper reports on a miniaturized microbial fuel cell with a microfluidic flow-through configuration: a porous anolyte chamber is formed by filling a microfluidic chamber with three-dimensional graphene foam as anode, allowing nutritional medium to flow through the chamber to intimately interact with the colonized microbes on the scaffolds of the anode. No nutritional media flow over the anode. This allows sustaining high levels of nutrient utilization, minimizing consumption of nutritional substrates, and reducing response time of electricity generation owing to fast mass transport through pressure-driven flow and rapid diffusion of nutrients within the anode...
January 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28120372/graphene-oxide-nanolayers-as-nanoparticle-anchors-on-biomaterial-surfaces-with-nanostructures-and-charge-balance-for-bone-regeneration
#14
Chaoming Xie, Honglong Sun, Kefeng Wang, Wei Zheng, Xiong Lu, Fuzeng Ren
Graphene oxide (GO) is a carbon-based nanomaterial with high surface area and abundant functional groups, providing various sites for binding and immobilization of growth factor vehicles. This study used GO nanolayer as an anchor for the immobilization of bone morphogenetic protein-2 (BMP-2)-encapsulated bovine serum albumin nanoparticles (NPs) on the hydroxyapatite (HA) and tricalcium phosphate (TCP) scaffolds by electrostatic interaction between the positive charges of the NPs and negative charges of GO. GO nanolayers prevented the rapid degradation of TCP scaffolds...
May 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28112762/3d-printable-conducting-hydrogels-containing-chemically-converted-graphene
#15
Sepidar Sayyar, Sanjeev Gambhir, Johnson Chung, David L Officer, Gordon G Wallace
The development of conducting 3D structured biocompatible scaffolds for the growth of electroresponsive cells is critical in the field of tissue engineering. This work reports the synthesis and 3D processing of UV-crosslinkable conducting cytocompatible hydrogels that are prepared from methacrylated chitosan (ChiMA) containing graphenic nanosheets. The addition of chemically converted graphene resulted in mechanical and electrical properties of the composite that were significantly better than ChiMA itself, as well as improved adhesion, proliferation and spreading of L929 fibroblasts cells...
January 23, 2017: Nanoscale
https://www.readbyqxmd.com/read/28107728/a-three-dimensional-core-shell-nanostructured-composite-of-polypyrrole-wrapped-mno2-reduced-graphene-oxide-carbon-nanotube-for-high-performance-lithium-ion-batteries
#16
Yong Li, Daixin Ye, Wen Liu, Bin Shi, Rui Guo, Haijuan Pei, Jingying Xie
Manganese oxides are promising anode materials for their high-energy density. However, they suffer from poor rate capability and fast capacity fading. Herein, we construct a three-dimensional (3D) core-shell structured polypyrrole (PPy)/MnO2-reduced graphene oxide (rGO)-carbon nanotubes (CNTs) composite via a facile two-step method. In the structure, the CNTs can facilitate fast electron conduction and keep structural integrity. The flexible and conductive rGO nanosheets work as both a reactive material and a carrier for MnO2 in-situ growth...
January 10, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28102070/well-ordered-oxygen-deficient-comoo4-and-fe2o3-nanoplate-arrays-on-3d-graphene-foam-toward-flexible-asymmetric-supercapacitors-with-enhanced-capacitive-properties
#17
Kai Chi, Zheye Zhang, Qiying Lv, Chuyi Xie, Jian Xiao, Fei Xiao, Shuai Wang
In this work, we report the development of well-ordered hydrogenated CoMoO4 (H-CoMoO4) and hydrogenated Fe2O3 (H-Fe2O3) nanoplate arrays on 3D graphene foam (GF) and explore their practice application as binder-free electrodes in assembling flexible all-solid-state asymmetric supercapacitor (ASC) devices. Our results show that the monolithic 3D porous GF prepared by solution casting method using Ni foam template possesses large surface area, superior electrical conductivity, and sufficient surface functional groups, which not only facilitate in situ growth of CoMoO4 and Fe2O3 nanoplates but also contribute the double-layer capacitance of the resultant supercapacitor...
February 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28089930/scaffolds-containing-chitosan-gelatin-and-graphene-oxide-for-bone-tissue-regeneration-in-vitro-and-in-vivo
#18
S Saravanan, Anjali C, M Vairamani, T P Sastry, K S Subramanian, N Selvamurugan
Critical-sized bone defects are augmented with cell free and cell loaded constructs to bridge bone defects. Improving the properties of three-dimensional scaffolds with multiple polymers and others is of growing interest in recent decades. Chitosan (CS), a natural biopolymer has limitations for its use in bone regeneration, and its properties can be enhanced with other materials. In the present study, the composite scaffolds containing CS, gelatin (Gn) and graphene oxide (GO) were fabricated through freeze-drying...
January 12, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28026926/3d-printing-biocompatible-polyurethane-poly-lactic-acid-graphene-oxide-nanocomposites-anisotropic-properties
#19
Qiyi Chen, Joey Dacula Mangadlao, Jaqueline Wallat, Al De Leon, Jonathan K Pokorski, Rigoberto C Advincula
Blending thermoplastic polyurethane (TPU) with poly(lactic acid) (PLA) is a proven method to achieve a much more mechanically robust material, whereas the addition of graphene oxide (GO) is increasingly applied in polymer nanocomposites to tailor further their properties. On the other hand, additive manufacturing has high flexibility of structure design which can significantly expand the application of materials in many fields. This study demonstrates the fused deposition modeling (FDM) 3D printing of TPU/PLA/GO nanocomposites and its potential application as biocompatible materials...
February 1, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28009868/in-situ-integration-of-graphene-foam-titanium-nitride-based-bio-scaffolds-and-microfluidic-structures-for-soil-nutrient-sensors
#20
Md Azahar Ali, Kunal Mondal, Yifei Wang, Huawei Jiang, Navreet K Mahal, Michael J Castellano, Ashutosh Sharma, Liang Dong
It is challenging to integrate porous graphene foam (GF) and GF-based nanocomposites into microfluidic channels and even create microfluidic structures within these materials. This is because their irregular interior pore shape and geometry, rough exterior surface, and relatively large material thickness make it difficult to perform conventional photolithography and etching. This challenge has largely hindered the potential of using GF-based materials in microfluidics-based sensors. Here we present a simple approach to create well-defined flow-through channels within or across the GF-based materials, using a liquid-phase photopolymerization method...
December 23, 2016: Lab on a Chip
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