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graphene scaffold

Katarzyna Szot-Karpińska, Piotr Golec, Adam Lesniewski, Barbara Palys, Frank Marken, Joanna Niedziółka-Jönsson, Grzegorz Wegrzyn, Marcin Łoś
With the advent of nanotechnology, carbon nanomaterials such as carbon nanofibers (CNF) have aroused substantial interest in various research fields including energy storage and sensing. Further improvement of their properties might be achieved via application of viral particles such as bacteriophages. In this report we present a filamentous M13 bacteriophage, with a point mutation in gene VII (pVII-mutant-M13), that selectively binds to the carbon nanofibers to form 3D structures. The phage-display technique was utilized for the selection of the pVII-mutant-M13 phage from the phage display peptide library...
October 17, 2016: Bioconjugate Chemistry
Wei Liu, Jing-Yao Liu, Mao-Sheng Miao
Tuning electronic structures and properties through chemical modifications has become the focus of recent research on graphene. The adsorption of metal atoms on graphene showed strong potential but is limited due to weak binding. On the other hand, macrocyclic molecules are well known for their strong and selective binding with metal atoms in solutions through coordination bonds. The alliance of the two substances will largely benefit the two parallel fields: it will provide a scaffold for coordination chemistry as well as a controllable method for tuning the electronic structure of graphene through strong binding with metals...
October 12, 2016: Nanoscale
Shi Wun Tong, Janardhan Balapanuru, Deyi Fu, Kian Ping Loh
In the short time since its discovery, perovskite solar cells (PSCs) have attained high power conversion efficiency but their lack of thermal stability remains a barrier to commercialization. Among the experimentally accessible parameter space for optimizing performance, identifying an electron transport layer (ETL) that forms a thermally stable interface with perovskite and which is solution-processible at low-temperature will certainly be advantageous. Herein, we developed a mesoporous graphene/polymer composite with these advantages when used as ETL in CH3NH3PbI3 PSCs, and a high efficiency of 13...
October 12, 2016: ACS Applied Materials & Interfaces
Sachin Kumar, Kaushik Chatterjee
Recent research suggests that graphene holds great potential in the biomedical field because of its extraordinary properties. Whereas initial attempts focused on the use of suspended graphene for drug delivery and bioimaging, more recent work has demonstrated its advantages for preparing substrates for tissue engineering and biomedical devices and products. Cells are known to interact with and respond to nanoparticles differently when presented in the form of a substrate than in the form of a suspension. In tissue engineering, a stable and supportive substrate or scaffold is needed to provide mechanical support, chemical stimuli, and biological signals to cells...
October 4, 2016: ACS Applied Materials & Interfaces
Ali H Palejwala, Jared S Fridley, Javier A Mata, Errol L G Samuel, Thomas G Luerssen, Laszlo Perlaky, Thomas A Kent, James M Tour, Andrew Jea
BACKGROUND: Graphene has unique electrical, physical, and chemical properties that may have great potential as a bioscaffold for neuronal regeneration after spinal cord injury. These nanoscaffolds have previously been shown to be biocompatible in vitro; in the present study, we wished to evaluate its biocompatibility in an in vivo spinal cord injury model. METHODS: Graphene nanoscaffolds were prepared by the mild chemical reduction of graphene oxide. Twenty Wistar rats (19 male and 1 female) underwent hemispinal cord transection at approximately the T2 level...
2016: Surgical Neurology International
Anshun Zhao, Zhaowei Zhang, Penghui Zhang, Shuang Xiao, Lu Wang, Yue Dong, Hao Yuan, Peiwu Li, Yimin Sun, Xueliang Jiang, Fei Xiao
Recent advances in on-body wearable medical apparatus and implantable devices drive the development of light-weight and bendable electrochemical sensors, which require the design of high-performance flexible electrode system. In this work, we reported a new type of freestanding and flexible electrode based on graphene paper (GP) supported 3D monolithic nanoporous gold (NPG) scaffold (NPG/GP), which was further modified by a layer of highly dense, well dispersed and ultrafine binary PtCo alloy nanoparticles via a facile and effective ultrasonic electrodeposition method...
September 28, 2016: Analytica Chimica Acta
Keyu Xie, Wenfei Wei, Kai Yuan, Wei Lu, Min Guo, Zhihua Li, Qiang Song, Xingrui Liu, Jian-Gan Wang, Chao Shen
Owing to its ultrahigh specific capacity and low electrochemical potential, lithium (Li) metal is regarded as one of the most attractive anode materials for next-generation lithium batteries. Nevertheless, the commercialization of Li-metal-based rechargeable batteries (LiMBs) has been retarded by the uncontrollable growth of Li dendrites, as well as the resulting poor cycle stability and safety hazards. In this work, a 3D graphene@Ni scaffold has been proposed to accomplish dendrite-free Li deposition via structural and interfacial synergistic effects...
October 5, 2016: ACS Applied Materials & Interfaces
Tao Zeng, Haiyan Zhang, Zhiqiao He, Jianmeng Chen, Shuang Song
Heterogeneous sulphate radical based advanced oxidation processes (SR-AOPs) have lately been raised as a promising candidate for water treatment. Despite the progress made, either the stability or the performance of the current catalysts is still far from satisfactory for practical applications. Herein, using polydopamine-cobalt ion complex that inspired by mussel proteins as medium, we facilely fabricate a robust SR-AOPs catalyst with cobalt nanoparticles (NPs) embedded in nitrogen-doped reduced graphene oxide matrix (NRGO@Co)...
2016: Scientific Reports
Sayed Habib Kazemi, Elham Ghodsi, Siamak Abdollahi, Samad Nadri
Herein, we report the fabrication of a novel label-free impedimetric biosensor employing porous graphene oxide (PrGO) nanostructures for the specific detection of cardiac troponin-I (cTnI) to establish the myocardial infarction (MI). This nano-immunosensor demonstrates an outstanding selectivity and high sensitivity towards the human-cTnI analyte. An excellent detection limit of 0.07ngmL(-1) and dynamic linear range of 0.1-10ngmL(-1) were calculated for anti-cTnI/PrGO/GC. Finally, this biosensor was employed to check the concentration of the MI biomarker in real clinical samples and the results are in good agreement with standard enzyme-linked fluorescence assay (ELFA) method...
December 1, 2016: Materials Science & Engineering. C, Materials for Biological Applications
Bo-Tau Liu, Kuan-Han Wu, Rong-Ho Lee
In this study, we prepared the reduced graphene oxide (rGO)-CdSe/ZnS quantum dots (QDs) hybrid films on a three-layer scaffold that the QD layer was sandwiched between the two rGO layers. The photocurrent was induced by virtue of the facts that the rGO quenched the photoluminescence of QDs and transferred the excited energy. The quenching mechanism was attributed to the surface energy transfer, supported in our experimental results. We found that the optoelectronic conversion efficiency of the hybrid films can be significantly improved by incorporating the silver nanowires (AgNWs) into the QD layer...
December 2016: Nanoscale Research Letters
Lin Wu, Yufang Hu, Yuhong Sha, Wenrou Li, Tiantian Yan, Sui Wang, Xing Li, Zhiyong Guo, Jun Zhou, Xiurong Su
A novel "in-electrode"-type electrochemiluminescence (ECL) immunosensor for the sensitive detection of squamous cell carcinoma antigen (SCCA) was constructed using magnetic graphene oxide (nanoFe3O4@GO) and Au nanoparticles/graphitic-phase carbon nitride (AuNPs/g-C3N4). The capture probe was prepared by immobilizing the primary antibody of SCCA (Ab1) on the nanoFe3O4@GO, while the AuNPs/g-C3N4 nanocomposites labelled the secondary antibody of SCCA (Ab2), which acted as a signal tag. The recognition scaffold was the following: the capture probe was immobilized onto the magnetic electrode surface that caught the target SCCA and finally allowed the immobilization of the signal tag via the interaction between antigen and antibody...
November 1, 2016: Talanta
Ziyun Jiang, Qin Song, Mingliang Tang, Lingyan Yang, Yilin Cheng, Min Zhang, Dongsheng Xu, Guosheng Cheng
One of the key challenges in engineering neural tissues for cell-based therapies is to develop a biocompatible scaffold material to direct neural stem cell (NSC) behaviors. One great advantage for a scaffold would be to induce NSC migration toward pathological sites during regeneration and repair. In particular, the inflammatory responses in the pathological zone, which are mainly mediated by microglia in the central nervous system, affect the repair capacity of NSCs through NSC migration. Recently, graphene was used as a neural interface and scaffold material, but few studies have addressed the relationship between microglia and NSCs in a graphene culture system...
September 28, 2016: ACS Applied Materials & Interfaces
Qingqing Pang, Deyan Wang, Xiuyan Wang, Shaoguang Feng, Michael B Clark, Qiaowei Li
In situ fabrication of graphene scaffold-ZrO2 nanofilms is achieved by thermal annealing of Zr-based metal-organic oligomers on SiO2 substrates. The structural similarities of the aromatic moieties in the ligand (phenyl-, naphthyl-, anthryl-, and pyrenyl-) compared to graphene play a major role in the ordering of the graphene scaffolds obtained. The depth profiling analysis reveals ultrathin carbon-pure or carbon-rich surfaces of the graphene scaffold-ZrO2 nanofilms. The graphene scaffolds with ∼96.0% transmittance in the visible region and 4...
September 28, 2016: ACS Applied Materials & Interfaces
Rongrong Guo, Shasha Zhang, Miao Xiao, Fuping Qian, Zuhong He, Dan Li, Xiaoli Zhang, Huawei Li, Xiaowei Yang, Ming Wang, Renjie Chai, Mingliang Tang
In order to govern cell-specific behaviors in tissue engineering for neural repair and regeneration, a better understanding of material-cell interactions, especially the bioelectric functions, is extremely important. Graphene has been reported to be a potential candidate for use as a scaffold and neural interfacing material. However, the bioelectric evolvement of cell membranes on these conductive graphene substrates remains largely uninvestigated. In this study, we used a neural stem cell (NSC) model to explore the possible changes in membrane bioelectric properties - including resting membrane potentials and action potentials - and cell behaviors on graphene films under both proliferation and differentiation conditions...
November 2016: Biomaterials
Dibyendu Chakravarty, Chandra Sekhar Tiwary, Cristano F Woellner, Sruthi Radhakrishnan, Soumya Vinod, Sehmus Ozden, Pedro Alves da Silva Autreto, Sanjit Bhowmick, Syed Asif, Sendurai A Mani, Douglas S Galvao, Pulickel M Ajayan
3D scaffolds of graphene, possessing ultra-low density, macroporous microstructure, and high yield strength and stiffness can be developed by a novel plasma welding process. The bonding between adjacent graphene sheets is investigated by molecular dynamics simulations. The high degree of biocompatibility along with high porosity and good mechanical properties makes graphene an ideal material for use as body implants.
August 26, 2016: Advanced Materials
Pei Feng, Shuping Peng, Ping Wu, Chengde Gao, Wei Huang, Youwen Deng, Tao Xiao, Cijun Shuai
A nano-sandwich construct was built by combining two-dimensional graphene nanosheets (GNSs) and one-dimensional carbon nanotubes (CNTs) to improve the mechanical properties of hydroxyapatite-polyetheretherketone (HAP-PEEK) scaffolds for bone tissue engineering. In this nano-sandwich construct, the long tubular CNTs penetrated the interlayers of graphene and prevented their aggregation, increasing the effective contact area between the construct and matrix. The combination of GNSs and CNTs in a weight ratio of 2:8 facilitated the dispersion of each other and provided a synergetic effect in enhancing the mechanical properties...
2016: International Journal of Nanomedicine
Soumya Vinod, Chandra Sekhar Tiwary, Leonardo D Machado, Sehmus Ozden, Robert Vajtai, Douglas S Galvao, Pulickel M Ajayan
Here, we report a highly scalable two-step method to produce graphene foams with ordered carbon nanotube reinforcements. In our approach, we first used solution assembly methods to obtain graphene oxide foam. Next, we employed chemical vapor deposition to simultaneously grow carbon nanotubes and thermally reduce the 3D graphene oxide scaffold. The resulting structure presented increased stiffness, good mechanical stability and oil absorption properties. Molecular dynamics simulations were carried out to further elucidate failure mechanisms and to understand the enhancement of the mechanical properties...
September 21, 2016: Nanoscale
Gaurav Lalwani, Michael D'Agati, Anu Gopalan, Manisha Rao, Jessica Schneller, Balaji Sitharaman
The assembly of carbon nanomaterials into three-dimensional (3D) porous scaffolds is critical to harness their unique physiochemical properties for tissue engineering and regenerative medicine applications. In this study, we report the fabrication, characterization and in vitro cytocompatibility of true 3D (>1 mm in all three dimensions), macroscopic (3-8 mm in height and 4-6 mm in diameter), chemically crosslinked graphene scaffolds prepared via radical initiated thermal crosslinking of single- and multi-walled graphene oxide nanoribbons (SWGONRs and MWGONRs)...
August 16, 2016: Journal of Biomedical Materials Research. Part A
Mar Vera-Sánchez, Salvador Aznar-Cervantes, Eva Jover, David García-Bernal, Ricardo E Oñate-Sánchez, Diana Hernández-Romero, Jose M Moraleda, Mar Collado-González, Francisco Javier Rodríguez-Lozano, Jose Luis Cenis
Graphene represents one of the most interesting additions to the tissue engineering toolbox. Novel graphene-based composites are required to improve the beneficial graphene properties in terms of tridimensional polymeric structure, conferring a higher mechanical strength and favoring the differentiation of human mesenchymal stem cells. Here, we have demonstrated in a wide range of composite combinations, the successful use of graphene and silk-fibroin constructs for future bioengineering applications in the field of clinical regenerative dentistry using human periodontal ligament stem cells...
August 8, 2016: Stem Cells and Development
Pei-Xin Yuan, Sheng-Yuan Deng, Chuan-Guang Yao, Ying Wan, Serge Cosnier, Dan Shan
A highly efficient surface plasmon resonance (SPR)-based DNA assay was developed, by employing noncovalently functionalized graphene nanosheets as a substrate, and enzymatic catalysis-induced polymerization as mass relay. The objective of this strategy was manifold: first of all, to sensitize the overall SPR output by in situ optimized electrogeneration of graphene thin-film, which was characterized by atomic force microscopic topography; secondly, to regulate the self-assembly and orientation of biotinylated capture probes on nickel-chelated nitrilotriacetic acid (NTA) scaffolds, that anchored onto graphene-supported pyrenyl derivatives; and lastly, to synergize the signal amplification via real-time conversion of the additive aniline into polyaniline precipitation by horseradish peroxidase-tagged reporters...
July 9, 2016: Biosensors & Bioelectronics
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