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Hui Li, Jingwei Hou, Linlin Duan, Chao Ji, Yatao Zhang, Vicki Chen
High efficient enzyme immobilization on carbon based conductive supports could provide wide applications in energy and environmental science. Here, we synthesized a 3D flower-like structured self-assembly hybrid nanocomposite with copper phosphate, laccase, graphite oxide (GO) and carbon nanotubes (CNTs) via a facile one-pot strategy under mild conditions. The prepared nanocomposite exhibited very high enzyme loading and improved laccase activity. During the formation of the nanocomposite, the copper phosphate-laccase petals were interwined by CNTs, and GO nanosheets were further coated on the petal surface...
May 11, 2017: Journal of Hazardous Materials
Shi Wah Choong, Shane R Russell, Jae Jin Bang, Justin K Patterson, Shelley A Claridge
The use of dimensionally ordered ligands on layered materials to direct local electronic structure and interactions with the environment promises to streamline integration into nanostructured electronic, optoelectronic, sensing, and nanofluidic interfaces. Substantial progress has been made in using ligands to control substrate electronic structure. Conversely, using the exposed face of the ligand layer to structure wetting and binding interactions, particularly with scalable solution- or spray-processed materials, remains a significant challenge...
May 23, 2017: ACS Applied Materials & Interfaces
Zhong-Jie Jiang, Zhongqing Jiang, Xiaoning Na Tian, Lijuan Luo, Meilin Liu
Sulfonated holey graphene oxides (SHGOs) have synthesized by the etching of sulfonated graphene oxides with concentrated HNO3 under the assistance of ultrasonication. These SHGOs could be used as the fillers for the sulfonated aromatic poly(ether ether ketone) (SPEEK) membrane. The obtained SHGO incorporated SPEEK membrane has a uniform and dense structure, exhibiting the higher performance as proton exchange membranes (PEMs), for instance, higher proton conductivity, lower activation energy for proton conduction, and comparable methanol permeability, as compared to Nafion® 112...
May 23, 2017: ACS Applied Materials & Interfaces
Jieyuan Li, Shi Yin, Fan Dong, Wanglai Cen, Yinghao Chu
Due to the limited characterization methods of structures and morphology of N doped carbocatalysts that are available at the atomic level, the detailed promotion mechanism of the catalytic efficiency is unspecific and the particular active sites introduced by the N atoms require further evaluation. Herein, this challenging issue is tackled by extensive theoretical simulation. It is firstly proposed that the active sites, where O2 molecules become adsorbed and activated, are tailored by synergistic graphitic and pyridinic N atoms, which remarkably accelerate the generation of highly chemical reactive O-containing species...
May 23, 2017: ACS Applied Materials & Interfaces
Qian Wei, Wei Wang, Erjun Zhou, Xiao-Ping Liu, Ming-Hui Liang, Ke Deng, Jing-Kui Yang, Peng Jiang
Three kinds of π-conjugated perylenetetracarboxylic diimide (PTCDI)-based organic functional derivatives, i.e., N,N'-di(2-ethylhexyl)-3,4,9,10-perylene diimide (molecule 1), N,N'-di(2-ethylhexyl)-1,7-dithien-2-yl-3,4,9,10-perylene diimide (molecule 2), N,N'-di(2-ethylhexyl)-1,7-di(2-bromothien-5-yl)-perylene-3,4,9,10-perylene diimide (molecule 3), have been prepared and investigated by using a scanning tunneling microscopy under ambient conditions. All of them can form long-ranged ordered self-assembled monolayer (SAM) with two different phase structures on highly oriented pyrolitic graphite (HOPG) surface...
May 12, 2017: Journal of Colloid and Interface Science
Maximilien Saint Cricq, Jesús Carrete, Christine Gaboriaud, Edmond Gravel, Eric Doris, Nicole Thielens, Natalio Mingo, Wai Li Ling
We atomistically compute the change in free energy upon binding of the globular domain of the complement protein C1q to carbon nanotubes (CNTs) and graphene in solution. Our modeling results imply that C1q is able to disaggregate and disperse bundles of large diameter multi-walled CNTs but not those of thin single-walled CNTs, and we validate this prediction with experimental observations. The results support the view of a strong binding, with potential implications for the understanding of the immune response and biomedical applications of graphitic nanomaterials...
May 22, 2017: Nano Letters
A K M Rezaul Haque Chowdhury, Bo Tan, Krishnan Venkatakrishnan
Carbon nanomaterials have emerged as a promising material in cancer diagnosis and therapy. Carbon nanomaterials/nanostructures (C-C molecular structure) act as a carrier/skeleton and require further surface modification through functionalization with chemicals or biomolecules to attain a cell response. We report the synthesis of a novel carbon nanoribbon network (CNRN) platform that possesses a combination of C-C and C-O bond architecture. The bioactive CNRN showed enhanced ability for cell adhesion. Most importantly, it induced opposite cell responses from healthy cells and cancerous cells, cytophilic to fibroblasts but cytotoxic to HeLa cells...
May 22, 2017: ACS Applied Materials & Interfaces
Alireza Khataee, Saeed Sajjadi, Aliyeh Hasanzadeh, Behrouz Vahid, Sang Woo Joo
Natural Martite ore particles and graphite were modified by alternating current (AC) glow discharge plasma to form nanostructured catalyst and cathode electrode for using in the heterogeneous-electro Fenton-like (Het-EF-like) process. The performance of the plasma-treated martite (PTM) and graphite electrode (PTGE) was studied for the treatment of paraquat herbicide in a batch system. 85.78% degradation efficiency for 20 mg L(-1) paraquat was achieved in the modified process under desired operational conditions (i...
May 16, 2017: Journal of Environmental Management
Kang-Yu Zou, Yi-Chen Liu, Yi-Fan Jiang, Cheng-Yan Yu, Man-Li Yue, Zuo-Xi Li
Herein three novel cobalt metal-organic frameworks (Co-MOFs) with similar ingredients, [Co(bib)(o-bdc)]∞ (1), [Co2(bib)2(m-bdc)2]∞ (2), and {[Co(bib)(p-bdc)(H2O)](H2O)0.5}∞ (3), have been synthesized from the reaction of cobalt nitrate with 1,4-bis(imidazol-1-yl)benzene (bib) and structure-related aromatic acids (1,2-benzenedicarboxylic acid = o-bdc, 1,3-benzenedicarboxylic acid = m-bdc, and 1,4-benzenedicarboxylic acid = p-bdc) by the solvothermal method. It is aimed to perform systematic research on the relationship among the conformation of benzoate acid, lattice dimension of Co-MOF, and pore diameter of MOF-derived carbon composite...
May 19, 2017: Inorganic Chemistry
Qiuyan Li, Shuhong Jiao, Langli Luo, Michael S Ding, Jianming Zheng, Samuel S Cartmell, Chong-Min Wang, Kang Xu, Ji-Guang Zhang, Wu Xu
Formulating electrolytes with solvents of low freezing points and high dielectric constants is a direct approach to extending the service temperature range of lithium (Li)-ion batteries (LIBs). In this work, we report such wide temperature electrolyte formulations by optimizing the content of ethylene carbonate (EC) in the ternary solvent system of EC, propylene carbonate (PC) and ethyl methyl carbonate (EMC) with LiPF6 salt and CsPF6 additive. An extended service temperature range from -40°C to 60°C was obtained in LIBs with lithium nickel cobalt aluminum mixed oxide (LiNi0...
May 19, 2017: ACS Applied Materials & Interfaces
Xian Jian, Shiyu Liu, Yuqi Gao, Wanli Zhang, Weidong He, Asif Mahmood, Chandrasekar M Subramaniyam, Xiaolin Wang, Nasir Mahmood, Shixue Dou
Designable control over morphology and structure of active materials is highly-desirable for achieving high-performance devices. Here, we develop a facile microwave assisted synthesis to decorate MnO2 nanocrystals on three dimensional (3D) graphite-like capsules (GCs) for obtaining sandwich nanostructures (3D MnO2@GCs@MnO2) as electrode materials for electrochemical capacitors (ECs). A templated growth of 3D GCs is carried out via catalytic chemical vapour deposition (CCVD) and MnO2 is decorated on exterior and interior surfaces of GC walls through microwave irradiation to build engineered architecture with robust structural and morphological stability...
May 19, 2017: ACS Applied Materials & Interfaces
Qiushi Ruan, Wenjun Luo, Jijia Xie, Yiou Wang, Xu Liu, Zhiming Bai, Claire J Carmalt, Junwang Tang
A novel nanojunction archiecture of metal-free photoanode, composed of B-doped carbon nitride nanolayer and bulk carbon nitride has been fabricated by a one-step construction approach. This type of nanojunction overcomes a few intrinsic drawbacks of carbon nitride film, e.g. severe bulk charge recombination and slow charge transfer. For the optium sample, the top layer of the nanojunction has a depth of ca. 100 nm and the bottom layer is ca. 900 nm. The nanojunction photoanode results into a 10 fold higher photocurrent than bulk graphitic carbon nitride and an extremely high incident photon-to-current efficiency (IPCE) of ca...
May 18, 2017: Angewandte Chemie
Susy Piovesana, Anna Laura Capriotti, Chiara Cavaliere, Giorgia La Barbera, Roberto Samperi, Riccardo Zenezini Chiozzi, Aldo Laganà
Magnetic solid-phase extraction is one of the most promising new extraction methods for liquid samples before ultra-high-performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) analysis. Several types of materials, including carbonaceous ones, have been prepared for this purpose. In this paper, for the first time, the preparation, characterization, and sorption capability of Fe3O4-graphitized carbon black (mGCB) composite toward some compounds of environmental interest were investigated. The synthesized mGCB consisted of micrometric GCB particles with 55 m(2) g(-1) surface area bearing some carbonyl and hydroxyl functionalities and the surface partially decorated by Fe3O4 microparticles...
May 18, 2017: Analytical and Bioanalytical Chemistry
Carlo Santoro, Alexey Serov, Rohan Gokhale, Santiago Rojas-Carbonell, Lydia Stariha, Jonathan Gordon, Kateryna Artyushkova, Plamen Atanassov
Different iron-based cathode catalysts have been studied for oxygen reduction reaction (ORR) in neutral media and then applied into microbial fuel cells (MFC). The catalysts have been synthesized using sacrificial support method (SSM) using eight different organic precursors named Niclosamide, Ricobendazole, Guanosine, Succinylsulfathiazole, Sulfacetamide, Quinine, Sulfadiazine and Pyrazinamide. Linear Sweep Voltammetry (LSV) curves were obtained for the catalysts using a O2 saturated in 0.1 M potassium phosphate buffer and 0...
May 15, 2017: Applied Catalysis. B, Environmental
Guoying Bai, Zhiping Song, Hongya Geng, Dong Gao, Kai Liu, Shuwang Wu, Wei Rao, Liangqia Guo, Jianjun Wang
Antifreeze proteins (AFPs), a type of high-efficiency but expensive and often unstable biological antifreeze, have stimulated substantial interest in the search for synthetic mimics. However, only a few reported AFP mimics display thermal hysteresis, and general criteria for the design of AFP mimics remain unknown. Herein, oxidized quasi-carbon nitride quantum dots (OQCNs) are synthesized through an up-scalable bottom-up approach. They exhibit thermal-hysteresis activity, an ice-crystal shaping effect, and activity on ice-recrystallization inhibition...
May 17, 2017: Advanced Materials
R Yivlialin, G Bussetti, L Magagnin, F Ciccacci, L Duò
In the currently accepted picture, when graphite is immersed and polarized in a diluted sulfuric acid electrolyte, the surface undergoes an invasive process due to the intercalation of solvated sulphate anions inside the crystal. The following evolution of CO, CO2 and O2 promotes the surface swelling and the growth of blisters. Here, we give evidence that the appearance of blisters affects the graphite surface as soon as the oxygen potential is reached, i.e. before the traditionally accepted anion intercalation stage, which instead is demonstrated slowing the blister development...
May 17, 2017: Physical Chemistry Chemical Physics: PCCP
Issa Kone, Ao Xie, Yang Tang, Yu Chen, Jia Liu, Yongmei Chen, Yanzhi Sun, Xiao Jin Yang, Pingyu Wan
Hierarchical porous Fe/N/S-doped carbon with dominance of graphitic nitrogen (FeNS/HPC) has been successfully synthesized by a facile dual-template method. FeNS/HPC shows not only macro-pores resulting from the dissolution of SiO2 template, but also abundant meso-pores were obtained after removing of the in-situ generated Fe2O3 nanoparticles on the ultra-thin (~4 nm) carbon shell of macro-pores. Moreover, micro-pores are produced during the thermal pyrolysis of carbon precursors. With respect to electrochemical performance towards oxygen reduction reaction (ORR), FeNS/HPC not only exceeds other prepared porous carbon materials completely, but also shows higher onset potential (0...
May 17, 2017: ACS Applied Materials & Interfaces
Alexey Klechikov, Jinhua Sun, Igor A Baburin, Gotthard Seifert, Anastasiia T Rebrikova, Natalya V Avramenko, Mikhail V Korobov, Alexandr V Talyzin
Multilayered intercalation of 1-octanol into the structure of Brodie graphite oxide (B-GO) was studied as a function of temperature and pressure. Reversible phase transition with the addition/removal of one layer of 1-octanol was found at 265 K by means of X-ray Diffraction (XRD) and Differential Scanning Calorimetry (DSC). The same transition was observed at ambient temperature upon a pressure increase above 0.6 GPa. This transition was interpreted as an incongruent melting of the low temperature/high pressure B-GO intercalated structure with five layers of 1-octanol parallel to GO sheets (L-solvate), resulting in the formation of a four-layered structure that is stable under ambient conditions (A-solvate)...
May 16, 2017: Nanoscale
Takaaki Tomai, Shunichi Ishiguro, Naoki Tamura, Yuta Nakayasu, Itaru Honma
Top-down graphene production via exfoliation from graphite produces a mass of graphene with structural variation in terms of the number of layers, sheet size, edge type, and defect density. All these characteristics affect its electronic structure. In order to develop useful applications of graphene, structural separation of graphene is necessary. In this study, we investigate the adsorption behavior of different types of graphene fragments using a multicolumn gel chromatography system with a view to developing an efficient method for separating high-quality graphene...
May 16, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Yeru Liang, Luyi Chen, Dongyang Zhuang, Hao Liu, Ruowen Fu, Mingqiu Zhang, Dingcai Wu, Krzysztof Matyjaszewski
Advances in the performances of many modern materials fundamentally depend upon the exploitation of new micro/nanostructures. Therefore, ingenious design of hierarchical structures through the mimicking of natural systems is of increasing importance. Currently, there is an urgent need for creation of multidimensional carbonaceous structures by integrating a customized hierarchical pore architecture and hybrid carbon framework. Here we report the pioneering fabrication of novel super-hierarchical carbons with a unique carbonaceous hybrid nanotube-interconnected porous network structure by utilizing well-defined carbon nanotube@polystyrene bottlebrushes as building blocks...
March 1, 2017: Chemical Science
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