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https://www.readbyqxmd.com/read/28718919/putting-rings-around-carbon-nanotubes
#1
Emilio M Pérez
In the last five years, we have developed synthetic methods towards encapsulation of single walled carbon nanotubes (SWNTs) into organic macrocycles, to form rotaxane-type molecules. These are the first examples of mechanically interlocked SWNTs derivatives (MINTs). In this article, I discuss our motivation to continue developing chemistry of SWNTs at a time well past their hype. We explain our synthetic strategy and characterization methodology in detail, stressing the general aspects. In particular, we emphasize the importance of adequate control experiments and bulk spectroscopic and analytical data to determine the structure of SWNT derivatives, as opposed to relying only (or mostly) on microscopy...
July 18, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28685912/understanding-noncovalent-interactions-of-small-molecules-with-carbon-nanotubes
#2
Joaquin Calbo, Alejandro López-Moreno, Alberto de Juan, Jeffrey Comer, Enrique Ortí, Emilio Manuel Pérez
We combine experiment, density functional theory (DFT) and molecular dynamics (MD) simulations for the quantitative analyses of the noncovalent interaction between single-walled carbon nanotubes (SWNTs), as hosts, and a set of pyrene derivatives with different electronic properties and surface area, as guests. The experiments and calculations were carried out in two solvents with markedly different polarities: 1,1',2,2'-tetrachloroethane (TCE) and N,N-dimethylformamide (DMF). Our results show that dispersion forces govern the supramolecular association of small molecules with SWNTs, with negligible contribution from ground-state charge-transfer effects...
July 7, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28675034/electropolymerized-pyrrole-based-conductive-polymeric-ionic-liquids-and-their-application-for-solid-phase-microextraction
#3
Amila M Devasurendra, Cheng Zhang, Joshua A Young, L M Viranga Tillekeratne, Jared L Anderson, Jon R Kirchhoff
Pyrrole was covalently bonded to 1-methyl and 1-benzylimidazolium ionic liquids (ILs) via an N-substituted alkyl linkage to prepare electropolymerizable IL monomers with excellent thermal stability. The methylimidazolium IL, [pyrrole-C6MIm](+), was then electropolymerized on macro- and microelectrode materials to form conductive polymeric IL (CPIL)-modified surfaces. Electrochemical characterization of a 1.6 mm diameter Pt disk electrode modified with poly[pyrrole-C6MIm](+) demonstrated a selective uptake for an anionic redox probe while rejecting a cationic redox probe...
July 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28642951/intermix-of-metal-nanoparticles-single-wall-carbon-nanotubes
#4
Feng Xu, Qin Lu, Lin Ye, S C Edman Tsang
Using physical mixtures of Pd/SWNTs (Pd nanoparticles on single-walled carbon nanotubes) and Pt/SWNTs, the composites show electro-catalytic properties comparable to the corresponding alloys: electron exchange readily occurs between the two metal nanoparticles via SWNT support at long ranges without direct atomic contact, which is responsible for the tunable alloy-like properties.
July 4, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28631625/high-loading-fe2o3-swnt-composite-films-for-lithium-ion-battery-applications
#5
Ying Wang, Jiahui Guo, Li Li, Yali Ge, Baojun Li, Yingjiu Zhang, Yuanyuan Shang, Anyuan Cao
Single-walled carbon nanotube (SWNT) films are a potential candidate as porous conductive electrodes for energy conversion and storage; tailoring the loading and distribution of active materials grafted on SWNTs is critical for achieving maximum performance. Here, we show that as-synthesized SWNT samples containing residual Fe catalyst can be directly converted to Fe2O3/SWNT composite films by thermal annealing in air. The mass loading of Fe2O3 nanoparticles is tunable from 63 wt.% up to 96 wt.%, depending on the annealing temperature (from 450 C to 600 C), while maintaining the porous network structure...
June 20, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28617574/synergistic-suppression-of-tumor-angiogenesis-by-co-delivering-of-vegf-targeted-sirna-and-candesartan-mediated-by-functionalized-carbon-nanovectors
#6
Xuefang Ding, Yujie Su, Cheng Wang, Fangrong Zhang, Kerong Chen, Yu Wang, Min Li, Wei Wang
Single-walled carbon nanotubes (SWNTs) with unique physicochemical properties have exhibited promising biomedical applications as drug/gene carrier. In this study, polyethyleneimine (PEI) modified SWNT conjugates linked with candesartan (CD) were developed to deliver vascular endothelial growth factor (VEGF) targeted siRNA (siVEGF) for synergistic and targeted treatment of tumor angiogenesis. The characterization results revealed that SWNT-PEI-CD conjugates were successfully synthesized, and exhibited desirable dispersibility and superior stability...
June 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28590493/novel-properties-of-0d-metal-organic-polyhedra-bonded-to-the-surfaces-of-2d-graphene-and-1d-single-walled-carbon-nanotubes
#7
Ram Kumar, C N R Rao
A strategy for the stabilization of metal-organic polyhedra (MOP) cages on graphene (Gr) and single-walled carbon nanotubes (NT) is reported. The surface area of the composites, MOPGr and MOPNT increases by an order of magnitude with a significant increase in pore volume in comparison to bulk MOP. The composites show an enhancement in the catalytic activity of up to ∼80% relative to bulk MOP in the conversion of propylene oxide into propylene carbonate. Depositing individual MOP cages on graphene or SWNT surfaces is beneficial in terms of gas adsorption and catalytic properties and provides a good example for useful effects of bonding materials of different dimensionalities...
June 27, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28569888/narrow-linewidth-carbon-nanotube-emission-in-silicon-hollow-core-photonic-crystal-cavity
#8
Thi Hong Cam Hoang, Elena Durán-Valdeiglesias, Carlos Alonso-Ramos, Samuel Serna, Weiwei Zhang, Matteo Balestrieri, Al-Saleh Keita, Niccolò Caselli, Francesco Biccari, Xavier Le Roux, Arianna Filoramo, Massimo Gurioli, Laurent Vivien, Eric Cassan
Polymer-sorted semiconducting single-walled carbon nanotubes (SWNTs) provide room-temperature emission at near-infrared wavelengths, with potential for large volume production of high-quality solutions and wafer-scale deposition. These features make SWNTs a very attractive material for the realization of on-chip light sources. Coupling SWNT into optical microcavities could enhance and guide their emission, while enabling spectral selection by cavity resonance engineering. This could allow the realization of bright, narrowband sources...
June 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28544754/heterogeneous-integration-of-carbon-nanotube-graphene-for-high-performance-flexible-and-transparent-photodetectors
#9
Soonjae Pyo, Wondo Kim, Han-Il Jung, Jungwook Choi, Jongbaeg Kim
Low-dimensional carbon materials, such as semiconducting carbon nanotubes (CNTs), conducting graphene, and their hybrids, are of great interest as promising candidates for flexible, foldable, and transparent electronics. However, the development of highly photoresponsive, flexible, and transparent optoelectronics still remains limited due to their low absorbance and fast recombination rate of photoexcited charges, despite the considerable potential of photodetectors for future wearable and foldable devices...
May 24, 2017: Small
https://www.readbyqxmd.com/read/28528552/universal-selective-dispersion-of-semiconducting-carbon-nanotubes-from-commercial-sources-using-a-supramolecular-polymer
#10
Alex Chortos, Igor Pochorovski, Pei Lin, Gregory Pitner, Xuzhou Yan, Theodore Z Gao, John W F To, Ting Lei, John W Will, H-S Philip Wong, Zhenan Bao
Selective extraction of semiconducting carbon nanotubes is a key step in the production of high-performance, solution-processed electronics. Here, we describe the ability of a supramolecular sorting polymer to selectively disperse semiconducting carbon nanotubes from five commercial sources with diameters ranging from 0.7 to 2.2 nm. The sorting purity of the largest-diameter nanotubes (1.4 to 2.2 nm; from Tuball) was confirmed by short channel measurements to be 97.5%. Removing the sorting polymer by acid-induced disassembly increased the transistor mobility by 94 and 24% for medium-diameter and large-diameter carbon nanotubes, respectively...
June 27, 2017: ACS Nano
https://www.readbyqxmd.com/read/28520555/relaxation-lifetimes-of-plasmonically-enhanced-hybrid-gold-carbon-nanotubes-systems
#11
Mareen Gläske, Manoj Kumar, Timo Bißwanger, Saulius Vaitiekenas, Cesare Soci, Rohit Narula, Annalisa Bruno, Antonio Setaro
Recently, we introduced a novel hybridization route for carbon nanotubes using gold nanoparticles, whose close proximity neatly enhances their radiative emission. Here we investigate the mechanisms behind the enhancement by monitoring the de-excitation dynamics of our π-hybrids through two-color pump-probe time-resolved spectroscopy. The de-excitation process reveals a fast component and a slow component. We find that the presence of gold prominently affects the fast processes, indicating a stronger influence of the gold nanoparticle on the intra-band non-radiative relaxation than on the inter-band recombination of the SWNT...
May 18, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28493516/single-walled-carbon-nanotube-based-ultrafast-high-capacity-al-ion-battery
#12
Preeti Bhauriyal, Arup Mahata, Biswarup Pathak
Exploring a suitable electrode material is a fundamental step in the direction of the development of Al-ion battery for enhanced performance. In this work, we have explored the feasibility of single-walled carbon nanotubes (SWNTs) as a cathode material for Al-ion batteries using the density functional theory calculations. Carbon nanotubes with the hollow structures and large surface area overcome the difficulty of activating the opening of interlayer spaces as observed in graphite electrode during the first intercalation cycle...
May 11, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28464292/rnai-mediated-gene-silencing-of-itpa-using-a-targeted-nanocarrier-apoptosis-induction-in-skbr3-cancer-cells
#13
Fahimeh Charbgoo, Mehrdad Behmanesh, Maryam Nikkhah, Eric G Kane
A pure nucleotide pool is required for high-fidelity DNA replication and prevention of carcinogenesis in living cells. Human inosine triphosphatase (ITPase), encoded by the ITPA gene, plays a critical role in maintaining the purity of the cellular nucleotide pool by excluding nucleotides that enhance mutagenesis. ITPase is a nucleoside triphosphate pyrophosphatase that hydrolyzes the non-canonical nucleotides inosine triphosphate (ITP) and xanthine triphosphate (XTP). The monophosphate products of ITPase reactions are subsequently excluded from the nucleotide pool and the improper substitution of ITP and XTP into DNA and RNA is prevented...
May 2, 2017: Clinical and Experimental Pharmacology & Physiology
https://www.readbyqxmd.com/read/28462065/dispersion-of-single-wall-carbon-nanotubes-with-supramolecular-congo-red-properties-of-the-complexes-and-mechanism-of-the-interaction
#14
Anna Jagusiak, Barbara Piekarska, Tomasz Pańczyk, Małgorzata Jemioła-Rzemińska, Elżbieta Bielańska, Barbara Stopa, Grzegorz Zemanek, Janina Rybarska, Irena Roterman, Leszek Konieczny
A method of dispersion of single-wall carbon nanotubes (SWNTs) in aqueous media using Congo red (CR) is proposed. Nanotubes covered with CR constitute the high capacity system that provides the possibility of binding and targeted delivery of different drugs, which can intercalate into the supramolecular, ribbon-like CR structure. The study revealed the presence of strong interactions between CR and the surface of SWNTs. The aim of the study was to explain the mechanism of this interaction. The interaction of CR and carbon nanotubes was studied using spectral analysis of the SWNT-CR complex, dynamic light scattering (DLS), differential scanning calorimetry (DSC) and microscopic methods: atomic force microscopy (AFM), transmission (TEM), scanning (SEM) and optical microscopy...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28444700/fluorescence-lifetime-imaging-and-super-resolution-microscopies-shed-light-on-the-directed-and-self-assembly-of-functional-porphyrins-onto-carbon-nanotubes-and-flat-surfaces
#15
Boyang Mao, David González Calatayud, Vincenzo Mirabello, Haobo Ge, Benjamin J Hodges, Robert M J Jacobs, Ashley M Shepherd, José Alberto Ribeiro Martins, Navaratnarajah Kuganathan, Jorge Bernardino De La Serna, Stanley W Botchway, Sofia Ioana Pascu
Two new routes to functionalized SWNTs have been established using a bulky Zn(II)-porphyrin featuring thiolate groups at the periphery. We probed the optical properties of this Zinc(II)-substituted, bulky aryl porphyrin and those of the corresponding new nano-composites with single walled carbon nanotube (SWNTs) and coronene, as a model for graphene. We report hereby on: (i) the supramolecular interactions between the pristine SWNTs and Zn(II)-porphyrin by virtue of π-π stacking, and (ii) a novel covalent binding strategy based on the Bingel reaction...
April 25, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28439553/maximizing-the-performance-of-photothermal-actuators-by-combining-smart-materials-with-supplementary-advantages
#16
Tongyu Wang, David Torres, Félix E Fernández, Chuan Wang, Nelson Sepúlveda
The search for higher-performance photothermal microactuators has typically involved unavoidable trade-offs that hinder the demonstration of ubiquitous devices with high energy density, speed, flexibility, efficiency, sensitivity, and multifunctionality. Improving some of these parameters often implies deterioration of others. Photothermal actuators are driven by the conversion of absorbed optical energy into thermal energy, which, by different mechanisms, can produce mechanical displacement of a structure...
April 2017: Science Advances
https://www.readbyqxmd.com/read/28426932/recycling-strategy-for-fabricating-low-cost-and-high-performance-carbon-nanotube-tft-devices
#17
Xiaoqin Yu, Dan Liu, Lixing Kang, Yi Yang, Xiaopin Zhang, Qianjin Lv, Song Qiu, Hehua Jin, Qijun Song, Jin Zhang, Qingwen Li
High-purity semiconducting single-walled carbon nanotubes (s-SWNTs) can be obtained by conjugated polymer wrapping. However, further purification of sorted s-SWNTs and high costs of raw materials are still challenges to practical applications. It is inevitable that a lot of polymers still cover the surface of s-SWNTs after separation, and the cost of the polymer is relatively higher than that of SWNTs. Here, we demonstrated a facile isolated process to improve the quality of s-SWNT solutions and films significantly...
April 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28403559/an-integrin-targeting-rgdk-tagged-nanocarrier-anticancer-efficacy-of-loaded-curcumin
#18
Krishnendu Das, Sahithi Nimushakavi, Arabinda Chaudhuri, Prasanta Kumar Das
Herein we report the design and development of α5 β1 integrin-specific noncovalent RGDK-lipopeptide-functionalized single-walled carbon nanotubes (SWNTs) that selectively deliver the anticancer drug curcumin to tumor cells. RGDK tetrapeptide-tagged amphiphiles were synthesized that efficiently disperse SWNTs with a suspension stability index of >80 % in cell culture media. 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT)- and lactate dehydrogenase (LDH)-based cell viability assays in tumor (B16F10 melanoma) and noncancerous (NIH3T3 mouse fibroblast) cells revealed the non-cytotoxic nature of these RGDK-lipopeptide-SWNT conjugates...
May 22, 2017: ChemMedChem
https://www.readbyqxmd.com/read/28387499/versatile-bottom-up-synthesis-of-tethered-bilayer-lipid-membranes-on-nanoelectronic-biosensor-devices
#19
Weiwei Zhou, Peter J Burke
Interfacing nanoelectronic devices with cell membranes can enable multiplexed detection of fundamental biological processes (such as signal transduction, electrophysiology, and import/export control) even down to the single ion channel level, which can lead to a variety of applications in pharmacology and clinical diagnosis. Therefore, it is necessary to understand and control the chemical and electrical interface between the device and the lipid bilayer membrane. Here, we develop a simple bottom-up approach to assemble tethered bilayer lipid membranes (tBLMs) on silicon wafers and glass slides, using a covalent tether attachment chemistry based on silane functionalization, followed by step-by-step stacking of two other functional molecular building blocks (oligo-poly(ethylene glycol) (PEG) and lipid)...
April 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28378326/on-chip-chemical-self-assembly-of-semiconducting-single-walled-carbon-nanotubes-swnts-toward-robust-and-scale-invariant-swnts-transistors
#20
Vladimir Derenskyi, Widianta Gomulya, Wytse Talsma, Jorge Mario Salazar-Rios, Martin Fritsch, Peter Nirmalraj, Heike Riel, Sybille Allard, Ullrich Scherf, Maria A Loi
In this paper, the fabrication of carbon nanotubes field effect transistors by chemical self-assembly of semiconducting single walled carbon nanotubes (s-SWNTs) on prepatterned substrates is demonstrated. Polyfluorenes derivatives have been demonstrated to be effective in selecting s-SWNTs from raw mixtures. In this work the authors functionalized the polymer with side chains containing thiols, to obtain chemical self-assembly of the selected s-SWNTs on substrates with prepatterned gold electrodes. The authors show that the full side functionalization of the conjugated polymer with thiol groups partially disrupts the s-SWNTs selection, with the presence of metallic tubes in the dispersion...
April 5, 2017: Advanced Materials
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