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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
#1
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
#2
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
#3
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/integrin-receptor-targeting-rgdk-tagged-nanocarrier-anticancer-efficacy-of-loaded-curcumin
#4
Prasanta Kumar Das, Krishnendu Das, Sahithi Nimushakavi, Arabinda Chaudhuri
Herein we report the design and development of α5β1 integrin receptor specific RGDK-lipopeptide associated non-covalently dispersed single walled carbon nanotube (SWNT) that selectively deliver anti-cancer curcumin to tumor cells. Arg-Gly-Asp-Lys (RGDK) tetrapeptide tagged amphiphiles were synthesized that efficiently dispersed SWNT with >80% suspension stability index in cell culture media. MTT & LDH based cell viability assays in tumor (melanoma, B16F10) and non-cancerous (mouse fibroblast cells, NIH3T3) revealed non-cytotoxic nature of RGDK-lipopeptide-SWNT conjugates...
April 12, 2017: ChemMedChem
https://www.readbyqxmd.com/read/28387499/versatile-bottom-up-synthesis-of-tethered-bilayer-lipid-membranes-on-nanoelectronic-biosensor-devices
#5
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
#6
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
https://www.readbyqxmd.com/read/28358486/separation-of-semiconducting-carbon-nanotubes-for-flexible-and-stretchable-electronics-using-polymer-removable-method
#7
Ting Lei, Igor Pochorovski, Zhenan Bao
Electronics that are soft, conformal, and stretchable are highly desirable for wearable electronics, prosthetics, and robotics. Among the various available electronic materials, single walled carbon nanotubes (SWNTs) and their network have exhibited high mechanical flexibility and stretchability, along with comparable electrical performance to traditional rigid materials, e.g. polysilicon and metal oxides. Unfortunately, SWNTs produced en masse contain a mixture of semiconducting (s-) and metallic (m-) SWNTs, rendering them unsuitable for electronic applications...
March 30, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28300630/functionalized-single-walled-carbon-nanotubes-cellular-uptake-biodistribution-and-applications-in-drug-delivery
#8
Zixian Li, Andre Luis Branco de Barros, Daniel Cristian Ferreira Soares, Sara Nicole Moss, Laleh Alisaraie
The unique properties of single-walled carbon nanotubes (SWNTs) enable them to play important roles in many fields. One of their functional roles is to transport cargo into cell. SWNTs are able to traverse amphipathic cell membranes due to their large surface area, flexible interactions with cargo, customizable dimensions, and surface chemistry. The cargoes delivered by SWNTs include peptides, proteins, nucleic acids, as well as drug molecules for therapeutic purpose. The drug delivery functions of SWNTs have been explored over the past decade...
March 11, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28290374/morphology-dependence-of-the-thermal-transport-properties-of-single-walled-carbon-nanotube-thin-films
#9
S Yoshida, Y Feng, C Delacou, T Inoue, R Xiang, R Kometani, S Chiashi, E I Kauppinen, S Maruyama
The thermal transport properties of random network, single-walled carbon nanotube (SWNT) films were assessed using Raman spectroscopy. Two types of SWNT films were investigated: single-layer and stacked. The single-layer films were fabricated by aerosol chemical vapour deposition and subsequent direct dry deposition, while the stacked films were prepared by placing the single-layer films on top of one another. The anisotropy of the network structures of each of these films was evaluated based on the angular dependence of the optical absorbance spectra...
May 5, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28267166/fingerprinting-seamless-single-walled-carbon-nanotube-junctions-via-the-migration-of-encapsulated-n2-molecules-from-bottom-to-top-are-arrays-of-va-swnts-continuous
#10
Theerapol Thurakitseree, Christian Kramberger, Pisith Singjai, Shigeo Maruyama
Structure control such as diameter changes along single-walled carbon nanotubes (SWNTs) can be achieved in arrays of vertically aligned (VA-) SWNTs by switching the feedstock during growth. The local nature of the macroscopic transition from one diameter to another is then questioned as one can either envisage seamless transitions or discontinuous individual SWNTs. Here, we demonstrate that encapsulated molecules can serve as markers to doubtlessly identify seamless interconnections in macroscopic samples. A migration of nitrogen molecules inside the continuous SWNTs is observed using bulk scale measurements on double-layered SWNT arrays synthesized from different carbon/nitrogen feedstocks...
March 7, 2017: Nanoscale
https://www.readbyqxmd.com/read/28255893/surface-engineering-of-nanoparticles-to-create-synthetic-antibodies
#11
Linda Chio, Darwin Yang, Markita Landry
Surface engineering of nanoparticles has recently emerged as a promising technique for synthetic molecular recognition of biological analytes. In particular, the use of synthetic heteropolymers adsorbed onto the surface of a nanoparticle can yield selective detection of a molecular target. Synthetic molecular recognition has unique advantages in leveraging the photostability, versatility, and exceptional chemical stability of nanomaterials. In particular, single-walled carbon nanotubes (SWNT) exhibit a large Stokes shift and near infrared emission for maximum biological sample transparency...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28251565/metallic-catalysts-for-structure-controlled-growth-of-single-walled-carbon-nanotubes
#12
REVIEW
Meihui Li, Xiyan Liu, Xiulan Zhao, Feng Yang, Xiao Wang, Yan Li
Single-walled carbon nanotubes (SWNTs) have shown great potential in various applications attributed to their unique structures and outstanding structure-dependent properties. The structure-controlled growth of SWNTs is a crucial issue for their advanced applications and has been a great challenge in this field for two decades. Metal catalyst-mediated SWNT growth is believed to be very efficient. In this review, progresses in diameter and chirality controlled growth of SWNTs with metal catalysts is summarized from several aspects, including growth mechanism and theory, effects of catalysts, and the chemical vapor deposition conditions...
April 2017: Topics in Current Chemistry (Journal)
https://www.readbyqxmd.com/read/28248087/thermoelectric-enhancement-by-compositing-carbon-nanotubes-into-iodine-doped-poly-2-methoxy-5-2-ethylhexyloxy-1-4-phenylenevinylene
#13
Murat Tonga, Lang Wei, Patrick S Taylor, Eugene Wilusz, Ljiljana Korugic-Karasz, Frank E Karasz, Paul M Lahti
Free-standing iodine-doped composite samples of poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) with carbon nanotubes (NTs) showed thermoelectric (TE) power factors (PFs) up to 33 μW·m(-1)·K(-2) after optimizing multiple factors, including: (1) sample fabrication solvent, (2) doping time, (3) average MEH-PPV molecular weight, (4) NT fraction in the composite, and (5) use of single-wall versus multi-wall nanotubes (SWNT and MWNT, respectively). Composite fabrication from halogenated solvents gave the best TE performance after iodine doping times of 2-4 h; performance drops substantially in ∼20 h doped samples...
March 1, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28221749/high-interlaminar-shear-strength-enhancement-of-carbon-fiber-epoxy-composite-through-fiber-and-matrix-anchored-carbon-nanotube-networks
#14
Yilei Wang, Suresh Kumar Raman Pillai, Jianfei Che, Mary B Chan-Park
To improve the interlaminar shear strength (ILSS) of carbon fiber reinforced epoxy composite, networks of multiwalled carbon nanotubes (MWNTs) were grown on micron-sized carbon fibers and single-walled carbon nanotubes (SWNTs) were dispersed into the epoxy matrix so that these two types of carbon nanotubes entangle at the carbon fiber (CF)/epoxy matrix interface. The MWNTs on the CF fiber (CF-MWNTs) were grown by chemical vapor deposition (CVD), while the single-walled carbon nanotubes (SWNTs) were finely dispersed in the epoxy matrix precursor with the aid of a dispersing agent polyimide-graft-bisphenol A diglyceryl acrylate (PI-BDA) copolymer...
March 1, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28204854/adsorption-of-dna-binding-proteins-to-functionalized-carbon-nanotube-surfaces-with-and-without-dna-wrapping
#15
Yu Ishibashi, Shusuke Oura, Kazuo Umemura
We examined the adsorption of DNA binding proteins on functionalized, single-walled carbon nanotubes (SWNTs). When SWNTs were functionalized with polyethylene glycol (PEG-SWNT), moderate adsorption of protein molecules was observed. In contrast, nanotubes functionalized with CONH2 groups (CONH2-SWNT) exhibited very strong interactions between the CONH2-SWNT and DNA binding proteins. Instead, when these SWNT surfaces were wrapped with DNA molecules (thymine 30-mers), protein binding was a little decreased. Our results revealed that DNA wrapped PEG-SWNT was one of the most promising candidates to realize DNA nanodevices involving protein reactions on DNA-SWNT surfaces...
February 15, 2017: European Biophysics Journal: EBJ
https://www.readbyqxmd.com/read/28199307/arrays-of-horizontal-carbon-nanotubes-of-controlled-chirality-grown-using-designed-catalysts
#16
Shuchen Zhang, Lixing Kang, Xiao Wang, Lianming Tong, Liangwei Yang, Zequn Wang, Kuo Qi, Shibin Deng, Qingwen Li, Xuedong Bai, Feng Ding, Jin Zhang
The semiconductor industry is increasingly of the view that Moore's law-which predicts the biennial doubling of the number of transistors per microprocessor chip-is nearing its end. Consequently, the pursuit of alternative semiconducting materials for nanoelectronic devices, including single-walled carbon nanotubes (SWNTs), continues. Arrays of horizontal nanotubes are particularly appealing for technological applications because they optimize current output. However, the direct growth of horizontal SWNT arrays with controlled chirality, that would enable the arrays to be adapted for a wider range of applications and ensure the uniformity of the fabricated devices, has not yet been achieved...
February 15, 2017: Nature
https://www.readbyqxmd.com/read/28198836/716%C3%A2-%C3%A2-nm-deep-red-passively-q-switched-pr-zblan-all-fiber-laser-using-a-carbon-nanotube-saturable-absorber
#17
Wensong Li, Tuanjie Du, Jinglong Lan, Changlei Guo, Yongjie Cheng, Huiying Xu, Chunhui Zhu, Fengqiu Wang, Zhengqian Luo, Zhiping Cai
We experimentally demonstrated a compact single-wall carbon-nanotube (SWNT)-based deep-red passively Q-switched Pr<sup>3+</sup>-doped ZBLAN all-fiber laser operating at 716 nm. A free-standing SWNT/polyvinyl alcohol composite film embedded between a pair of fiber connectors was employed as a saturable absorber (SA). The deep-red Q-switched operation is attributed to the combination of implementing a pair of fiber end-facet mirrors to achieve the linear laser resonator and incorporating a SWNT-SA into the cavity as a Q-switcher...
February 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28158120/terahertz-conductivity-engineering-in-surface-decorated-carbon-nanotube-films-by-gold-nanoparticles
#18
Debanjan Polley, Animesh Patra, Anjan Barman, Rajib Kumar Mitra
We report the controllable conductivity of single-walled carbon nanotubes (SWNTs) and multiwalled carbon nanotubes with their surface walls decorated by gold nanoparticles (Au NPs) with varying concentration in terahertz (THz) frequency range. Colloidal Au NPs of nominal diameter ∼15  nm are synthesized by the reduction of gold chloride solution using tri-sodium citrate. A simple chemical route is followed to attach Au NPs on the surfaces of both types of carbon nanotubes (CNTs). The attachment of Au NPs on the sidewalls of CNTs is confirmed by UV-visible spectroscopy and scanning electron microscope images...
February 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/28117777/engineering-molecular-recognition-with-bio-mimetic-polymers-on-single-walled-carbon-nanotubes
#19
Jackson T Del Bonis-O'Donnell, Abraham Beyene, Linda Chio, Gözde Demirer, Darwin Yang, Markita P Landry
Semiconducting single-wall carbon nanotubes (SWNTs) are a class of optically active nanomaterial that fluoresce in the near infrared, coinciding with the optical window where biological samples are most transparent. Here, we outline techniques to adsorb amphiphilic polymers and polynucleic acids onto the surface of SWNTs to engineer their corona phases and create novel molecular sensors for small molecules and proteins. These functionalized SWNT sensors are both biocompatible and stable. Polymers are adsorbed onto the nanotube surface either by direct sonication of SWNTs and polymer or by suspending SWNTs using a surfactant followed by dialysis with polymer...
January 10, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28117122/carboxylated-single-walled-carbon-nanotube-functionalized-chiral-polymer-monoliths-for-affinity-capillary-electrochromatography
#20
Chunyue Miao, Ruihan Bai, Shujuan Xu, Tingting Hong, Yibing Ji
Carboxylated single-walled carbon nanotubes (c-SWNTs) were incorporated into poly(glycidylmethacrylate-co-ethylene glycol dimethacrylate) [poly(GMA-co-EDMA)] monoliths to develop a novel monolithic stationary phase for capillary electrochromatography. The prepared monoliths were characterized by scanning electron microscopy and nitrogen adsorption. Additionally, pepsin, which is a chiral selector, was bonded to the c-SWNT-incorporated monoliths via epoxide groups as reactive sites and glutaraldehyde as the spacer...
March 3, 2017: Journal of Chromatography. A
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