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Understanding exact electronic configurations of carbon atoms bonded by nitrogen (N) functionalities at atomic-level may literally open a door to advance metal-free carbon materials as efficient catalysts for the oxygen reduction reaction (ORR). In this paper, a set of well-defined carbon nanotubes with controlled doping of various N species, such as pyrrolic, pyridinic and graphitic N, have been...
Comparison of nitrogen adsorption isotherms of porous carbons before and after exposure to proteins yields information on the pore landscape that is unobtainable from small angle neutron scattering (SANS) [Carbon 2016; 106:142–151]. Two globular proteins, bovine serum albumin (BSA), and bovine pancreatic trypsin inhibitor (BPTI), are studied, with two different porous carbon substrates: a hydrophobic...
Oxygen vacancy plays an important role in optimizing the thermoelectric properties for achieving high figure of merit in perovskite oxides. However, it remains very challenging to find a facile and effective method for creating oxygen vacancy in bulk perovskite material. Using undoped strontium titanate (STO) as a model for perovskite, it is demonstrated here that incorporating graphene into STO can...
The aim the present work was to produce carbon foams with as different as possible porous structures but with similar composition and carbon texture for studying precisely the influence of different structural parameters such as density, cell size or interconnectivity on the physical properties of these foams. Over 60 different cellular carbon foams were obtained by pyrolysis of phenolic-furanic rigid...
Carbon materials show promising application on energy storage due to high specific area, hierarchical porous structure and high electrical conductivity. Here mesoporous few-layer carbon (1–4 layer) with high specific surface area, unique nanoporous structure and good electron conductivity is synthesized via facile magnesium xerogels combined with chemical vapor deposition. This carbon material shows...
Owing to the convenient and visual advantages, dye mapping agents are the most popular lymph tracing agents in the current clinic practices. However, limit tissue penetration always leads to hardly detect deeper lymph nodes (LNs), such as regional lymph nodes (RLNs). Therefore, exploring multimodal nanotheranostic agents for diagnosis and treatment of metastatic LNs are desired. In this study, polydopamine-encapsulated...
Carbide-derived carbon (CDC) aerogels with hierarchical porosity are prepared from cross-linked polycarbosilane aerogels by pyrolysis and chlorine treatment at 700 and 1000 °C. The low-temperature sample is further activated with carbon dioxide to introduce additional micropores. The influence of the micropore structures resulting from the different synthesis conditions and the effect of the combination...
Dispersions of functionalized carbon nanotubes (fx-CNTs) have been analyzed by means of Low Field Nuclear Magnetic Resonance measurements (LF-NMR). This technique showed that the presence of the fx-CNTs strongly influences the structuring of the water molecules. Thereupon, the water transversal relaxation rate (r2) can be used to get information about the concentration of the CNTs in aqueous dispersion...
The control of the charge state of nitrogen-vacancy (NV) centers in diamond is of primary importance for the stabilization of their quantum-optical properties, in applications ranging from quantum sensing to quantum computing. In this work buried current-injecting graphitic micro-electrodes were fabricated in bulk diamond by means of a 6 MeV C3+ scanning micro-beam. The electrodes were exploited to...
The potential adverse effects of graphene oxide (GO) on organisms have received great attention. However, the underlying molecular mechanisms for response to GO exposure are still largely unclear. Canonical Wnt/β-catenin signaling is an evolutionarily conserved signaling, and plays a key role in the development. Using assay system of Caenorhabditis elegans, we investigated the potential involvement...
Biochar exhibits a great potential to act as a universally applicable material for water and soil remediation due to extensive availability of feedstocks and favorable physio-chemical surface characteristics; nevertheless, studies related to its application on the remediation of toxic metalloids are relatively rare. Hence, this review highlights biochar production technologies, biochar properties,...
Carbon molecular sieve (CMS) membranes were prepared by controlled pyrolysis of polyetherimide (PEI) blended with polyimide (PI). The microstructure and gas separation properties of the precursor membranes and supported CMS membranes were characterized in terms of the different weight ratios of PI to PEI. The thermogravimetric analysis indicated that the co-pyrolysis in the PEI/PI appeared above 450 °C...
A lithium sulfur (Li-S) battery is attracting considerable attention as a next-generation, high-performing battery. In response to the great demand for lightweight, high-capacity batteries, persistent efforts have been made to solve Li-S battery problems such as polysulfide shuttling. In particular, it has become important to develop a flexible battery in portable electronics. In this study, a Li-S...
Elucidating the key factors that determine the lengths of single-walled carbon nanotubes (SWCNTs) is of great importance for understanding the origin of chiral selectivity. We use transmission electron microscopy to thoroughly investigate as-grown SWCNTs. The lengths and growth modes of SWCNTs were decided by bright-field imaging. Their respective chiral angles were calculated on the basis of nanobeam...
Combination of Raman spectroscopy and electrical resistance measurements carried out under non-hydrostatic stress reveals a direct correlation between the transport properties and the concentration of structural defects in graphite, as measured by the relative intensity of the D and D′ bands. We have found that the piezoelectric behavior of highly defected specimens can be modulated through changes...
The synthesis of novel one-dimensional carbon nanostructures named diamond nanothreads (DNT) has been recently reported, and subsequent studies employing molecular dynamics (MD) simulations demonstrated that they possess remarkable mechanical properties. In this paper we present the results of Density Functional Theory calculations of the mechanical properties for several DNT configurations, confirming...
A simple yet efficient one-step route is reported to prepare a three-dimensional interconnected thin-layer carbon network consisting of graphene sheets sandwiched by a porous carbon layer (PCG). Our route relies on the direct pyrolysis of ethylene diamine tetraacetic acid tripotassium salt (EDTA-3K) in the presence of polyelectrolyte-functionalized graphene oxide (GO) at 750 °C. The decomposition...
Using molecular dynamics simulations with a reactive force field (ReaxFF), we generate models of amorphous carbon (a-C) at a wide range of densities (from 0.5 g/cc to 3.2 g/cc) via the ‘liquid-quench’ method. A systematic study is undertaken to characterize the structural features of the resulting a-C models as a function of carbon density and liquid quench simulation conditions: quench rate, type...
We investigate electron-derived thermal transport in zigzag graphene nanoribbons (ZGNRs) with topological line defects (TLDs) including tetragon-TLD (4-TLD), octagon-TLD (8-TLD), double pentagons and octagon-TLD (558-TLD), as well as double pentagons and double heptagons-TLD (5757-TLD). Results show that these TLDs can efficiently modify the band structure and electron-derived thermal conductance...
A major use of multi-walled carbon nanotubes (MWCNTs) is as functional fillers embedded in a solid matrix, such as plastics or coatings. Weathering and abrasion of the solid matrix during use can lead to environmental releases of the MWCNTs. Here we focus on a protocol to identify and quantify the primary release induced by weathering, and assess reproducibility, transferability, and sensitivity towards...
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