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Multiwall carbon nanotubes

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https://www.readbyqxmd.com/read/28820472/mussel-inspired-dopamine-and-carbon-nanotube-leading-to-a-biocompatible-self-rolling-conductive-hydrogel-film
#1
Junzi Jiang, Yong Huang, Yitian Wang, Hui Xu, Malcolm Xing, Wen Zhong
We report a novel self-rolling, conductive, and biocompatible multiwall carbon nanotube (MWCNT)-dopamine-polyethylene glycol (PEG) hydrogel film. The gel can self-fold into a thin tube when it is transferred from a glass slide to an aqueous environment, regardless of the concentrations of the MWCNT. The film presents a highly organized pattern, which results from the self-assembly of hydrophilic dopamine and hydrophobic carbon nanotubes. By exploring the biomedical potential, we found that MWCNT-included rolled film is nontoxic and can promote cell growth...
August 18, 2017: Materials
https://www.readbyqxmd.com/read/28814127/carbon-nanotubes-functionalized-with-folic-acid-attached-via-biomimetic-peptide-linker
#2
Justyna Fraczyk, Malgorzata Walczak, Lukasz Szymanski, Zbigniew Kolacinski, Henryk Wrzosek, Ireneusz Majsterek, Karolina Przybylowska-Sygut, Zbigniew J Kaminski
AIM: Anchoring folic acid (FA) with a biomimetic peptidic linker resistant to proteolytic degradation to act as a homing device on functionalized carbon nanotubes. MATERIALS & METHODS: Ethylenediamine was attached to oxidized multiwalled carbon nanotubes (MWNTs) using 4-(4,6-dimethoxy-[1,3,5]triazin-2-yl)-4-methylmorpholinium tetrafluoroborate. FA was coupled with 6-aminohexanoic acid and derivatives of β-alanine, affording four intermediates, which connected to the MWNTs via peptidic linkers of various lengths...
August 17, 2017: Nanomedicine
https://www.readbyqxmd.com/read/28809531/highly-efficient-method-for-the-synthesis-of-activated-mesoporous-biocarbons-with-extremely-high-surface-area-for-high-pressure-co2-adsorption
#3
Gurwinder Singh, Kripal Singh Lakhi, In Young Kim, Sungho Kim, Prashant Srivastava, Ravi Naidu, Ajayan Vinu
A simple and efficient way to synthesize activated mesoporous biocarbons (AMBs) with extremely high BET surface area and large pore volume has been achieved for the first time through a simple solid state activation of freely available biomass, Arundo donax, with zinc chloride. The textural parameters of the AMB can easily be controlled by varying the activation temperature. It is demonstrated that the mesoporosity of AMB can be finely tuned with a simple adjustment of the amount of activating agent. AMB with almost 100% mesoporosity can be achieved using the activating agent and the biomass ratio of 5 and carbonization at 500 °C...
August 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28800626/targeting-lysyl-oxidase-reduces-peritoneal-fibrosis
#4
Christopher R Harlow, Xuan Wu, Marielle van Deemter, Fiona Gardiner, Craig Poland, Rebecca Green, Sana Sarvi, Pamela Brown, Karl E Kadler, Yinhui Lu, J Ian Mason, Hilary O D Critchley, Stephen G Hillier
BACKGROUND: Abdominal surgery and disease cause persistent abdominal adhesions, pelvic pain, infertility and occasionally, bowel obstruction. Current treatments are ineffective and the aetiology is unclear, although excessive collagen deposition is a consistent feature. Lysyl oxidase (Lox) is a key enzyme required for crosslinking and deposition of insoluble collagen, so we investigated whether targeting Lox might be an approach to reduce abdominal adhesions. METHODS: Female C57Bl/6 mice were treated intraperitoneally with multiwalled carbon nanotubes (NT) to induce fibrosis, together with chemical (ß-aminoproprionitrile-BAPN) or miRNA Lox inhibitors, progesterone or dexamethasone...
2017: PloS One
https://www.readbyqxmd.com/read/28780849/photoelectrochemical-behavior-of-a-molecular-ru-based-water-oxidation-catalyst-bound-to-tio2-protected-si-photoanodes
#5
Roc Matheu, Ivan A Moreno-Hernandez, Xavier Sala, Harry B Gray, Bruce S Brunschwig, Antoni Llobet, Nathan S Lewis
A hybrid photoanode based on a molecular water oxidation precatalyst was prepared from TiO2-protected n- or p(+)-Si coated with multiwalled carbon nanotubes (CNT) and the ruthenium-based water oxidation precatalyst [Ru(IV)(tda)(py-pyr)2(O)], 1(O) (tda(2-) is [2,2':6',2''-terpyridine]-6,6''-dicarboxylato and py-pir is 4-(pyren-1-yl)-N-(pyridin-4-ylmethyl)butanamide). The Ru complex was immobilized by π-π stacking onto CNTs that had been deposited by drop casting onto Si electrodes coated with 60 nm of amorphous TiO2 and 20 nm of a layer of sputtered C...
August 7, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28774853/anti-alzheimer-s-potential-of-berberine-using-surface-decorated-multi-walled-carbon-nanotubes-a-preclinical-evidence
#6
Shikha Lohan, Kaisar Raza, S K Mehta, Gurjit Kaur Bhatti, Sumant Saini, Bhupinder Singh
Carbon nanotubes (CNTs), a sub-family of fullerenes, are nanosized seamless cylinders of graphene sheets with enormous drug loading potential. The current studies entail the systematic development of berberine (BRB)-loaded multiwalled carbon nanotubes (MWCNTs) with polysorbate and phospholipid coating for effective management of Alzheimer's Disease (AD). For systematic optimization using design of experiment (DoE), a central composite design (FCCD) was employed and the optimized formulation was choosen using numerical desirability function...
July 31, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28773039/effect-of-carbon-in-fabrication-al-sic-nanocomposites-for-tribological-application
#7
Bartosz Hekner, Jerzy Myalski, Tomasz Pawlik, Małgorzata Sopicka-Lizer
Aluminium-based hybrid composites are a new class of advanced materials with the potential of satisfying the demands in engineering applications. This paper describes the effects of carbon addition on the formation and properties of AMC with SiC nanoparticles reinforcement. The composites were produced via mechanical alloying followed by hot pressing. Three forms of carbon, graphite (GR), multiwalled carbon nanotubes (CNTs), and, for the first time, glassy carbon (GC), were used for the hybrid composites manufacturing and compared with tribological properties of Al-SiC composite without carbon addition...
June 21, 2017: Materials
https://www.readbyqxmd.com/read/28771846/amorphous-transition-metal-sulfides-anchored-on-amorphous-carbon-coated-multiwalled-carbon-nanotubes-for-enhanced-lithium-ion-storage
#8
Rencheng Jin, Qinghe Zhai, Qingyao Wang
Cobalt sulfide and molybdenum sulfide with high theoretical capacity have been considered as one of most promising anode materials for lithium-ion batteries (LIBs). However, the poor cyclability and low rate performance originated from the large volume expansion and poor electrical conductivity extremely inhibit their practical application. Here, the electrochemical performance is effectively improved by growing amorphous cobalt sulfide and molybdenum sulfide onto amorphous carbon coated multiwalled carbon nanotubes (CNTs@C@CoS2 and CNTs@C@MoS2)...
August 3, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28771261/na-co-batteries-devices-to-trap-co
#9
Jianchao Sun, Yaran Zhao, Hao Yang, Chengcheng Chen, Jun Chen
Metal-gas batteries that remove CO gases would provide enormous environmental benefits. We report here Na-CO batteries using the combination of a sodium anode and a binder-free multiwall carbon nanotube cathode with a CO reactant. The constructed Na-CO batteries show a high discharge capacity of 8000 mA h g(-1) based on the mass of carbon nanotubes (corresponding to ∼865.9 W h kg(-1) based on the mass of total active materials) and a stable cycling of 70 cycles with an increased gap of only 3.7 mV. This work offers a promising strategy for efficient utilization of CO to generate electricity through an electrochemical conversion method...
August 17, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28762866/in-vitro-bioactivity-of-one-and-two-dimensional-nanoparticle-incorporated-bone-tissue-engineering-scaffolds
#10
Jason Thomas Rashkow, Gaurav Lalwani, Balaji Sitharaman
This study investigates the effect of incorporation of one- or two-dimensional nanoparticles with distinct composition and morphology on the bioactivity of biodegradable, biocompatible polymer matrices. 0.2 wt% multiwalled carbon nanotubes (MWCNTs), multiwalled graphene nanoribbons (MWGONRs), graphene nanoplatelets (GONPs), molybdenum disulfide nanoplatelets (MSNPs), or tungsten disulfide nanotubes (WSNTs) were uniformly dispersed in poly(lactic-co-glycolic acid) (PLGA) polymer. PLGA or nanoparticle incorporated PLGA were then incubated with simulated body fluid (SBF) under physiological conditions for 1, 3, 7, or 14 days...
August 1, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28762264/chemically-edited-exosomes-with-dual-ligand-purified-by-microfluidic-device-for-active-targeted-drug-delivery-to-tumor-cells
#11
Jie Wang, Wei Li, Leicheng Zhang, Lin Ban, Peng Chen, Wei Du, Xiaojun Feng, Bi-Feng Liu
Exosomes, which are lipid membrane-bound nanovesicles (50-150 nm in diameter), have aroused extensive attention for their potential applications in invasive molecular and stand for a new therapeutic delivery system. However, they are limited by poor targeting ability and a lack of efficient isolation techniques. Here, we present a three-dimensional nanostructured microfluidic chip, in which arrays of micropillars were functionalized with crisscrossed multiwall carbon nanotubes by chemical deposition, to capture exosomes with high efficiency through a combination of a specific recognition molecule (CD63) and the unique topography of the nanomaterials...
August 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28746997/removal-of-bisphenol-a-by-electrochemical-carbon-nanotube-filter-influential-factors-and-degradation-pathway
#12
Ahmed Refaat Bakr, Md Saifur Rahaman
Bisphenol A is a chemical with hazardous health effects that is largely used in the manufacture of extensively used products including adhesives, plastics, powder paints, thermal paper and paper coatings, and epoxy resin, and is reported to exist in nature in an accumulative manner. In this study, both pristine and boron-doped multiwalled carbon nanotubes (MWNTs) were employed as filtration and electrochemical filtration materials, resulting in a significant removal of bisphenol A with identical performance for both MWNTs types...
October 2017: Chemosphere
https://www.readbyqxmd.com/read/28742363/improved-performance-of-glucose-bioanodes-using-composites-of-7-6-single-walled-carbon-nanotubes-and-a-ferrocene-lpei-redox-polymer
#13
Jie Chen, Rujuta Munje, Nicholas P Godman, Shalini Prasad, Daniel T Glatzhofer, David W Schmidtke
The effect of incorporating different types of carbon nanotubes into composite films of a redox polymer (FcMe2-C3-LPEI) and glucose oxidase (GOX) was investigated. The composite films were constructed by first forming a high-surface area network film of either single-walled carbon nanotubes (SWNTs) or multiwalled carbon nanotubes (MWNTs) on a glassy carbon electrode (GCE) by solution casting of a suspension of Triton-X-100 dispersed SWNTs. Next a glucose responsive redox hydrogel was formed on top of the nanotube-modified electrode by cross-linking FcMe2-C3-LPEI with glucose oxidase via ethylene glycol diglycidyl ether (EGDGE)...
July 25, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28740357/diffusion-of-multiwall-carbon-nanotubes-mwcnts-through-a-high-density-polyethylene-hdpe-geomembrane
#14
P T Saheli, R K Rowe, E J Petersen, D M O'Carroll
The new applications for carbon nanotubes (CNTs) in various fields and consequently their greater production volume have increased their potential release to the environment. Landfills are one of the major locations where carbon nanotubes are expected to be disposed and it is important to ensure that they can limit the release of CNTs. Diffusion of multiwall carbon nanotubes (MWCNTs) dispersed in an aqueous media through a high-density polyethylene (HDPE) geomembrane (as a part of the landfill barrier system) was examined...
May 2017: Geosynth Int
https://www.readbyqxmd.com/read/28739407/ultrasensitive-transglutaminase-based-nanosensor-for-early-detection-of-celiac-disease-in-human
#15
Shagun Gupta, Ankur Kaushal, Ashok Kumar, Dinesh Kumar
A GQD/PAMAM nanohybrid modified on gold nanoparticles (AuNP) embedded in multiwalled carbon nanotubes (MWCNT) based immunosensor was developed for detection of celiac disease in human. The AuNP embedded in MWCNT were linked with thiol groups of cysteine and amino groups were further coupled with carboxyl moieties of graphene quantum dots (GQDs) using EDC-NHS cross-linking chemistry. To enhance the sensitivity of the sensor, polyamidoamine (PAMAM) dendrimer was attached with GQDs through carbodiimide coupling...
July 21, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28738604/electrochemical-investigation-and-determination-of-procaterol-hydrochloride-on-poly-glutamic-acid-carboxyl-functionalized-multiwalled-carbon-nanotubes-polyvinyl-alcohol-modified-glassy-carbon-electrode
#16
Dexian Kong, Lili Jiang, Yijun Liu, Zeming Wang, Libin Han, Rixin Lv, Jiandi Lin, Chun-Hua Lu, Yuwu Chi, Guonan Chen
Poly(glutamic acid) (P-GLU)/carboxyl functionalized multiwalled carbon nanotubes (MWCNTs-COOH)/polyvinyl alcohol (PVA) modified glassy carbon electrode (GCE) has been successfully prepared and the electrochemical behavior of procaterol hydrochloride (ProH) was studied. The results show that the as-prepared modified electrode exhibits a good electrocatalytic property towards the oxidation of ProH in 0.2M phosphate buffer solution (PBS) (pH 6.0) due to the enhanced oxidation peak current at ~+0.59V. Under optimal reaction conditions, the oxidation peak current of ProH is proportional to its concentration in the linear dynamic ranges of 0...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28735002/immobilization-of-%C3%AE-galactosidase-on-surface-modified-cobalt-multiwalled-carbon-nanotube-nanocomposite-improves-enzyme-stability-and-resistance-to-inhibitor
#17
Maryam Khan, Qayyum Husain, Rani Bushra
The present study aimed to work out a high yield procedure for immobilization of Aspergillus oryzae β-galactosidase on polyaniline cobalt multiwalled carbon nanotubes nanocomposite (PANI/Co/MWCNTNC) by physical adsorption and covalent attachment via glutaraldehyde. The binding was confirmed by scanning and transmission electron microscopy along with Fourier transform-infrared spectroscopy. The immobilization yields obtained for adsorbed and cross-linked enzymes were 93% and 97%, respectively. The covalently immobilized enzyme was remarkably more stable at extremes of pH and temperature compared to native and adsorbed enzymes...
July 19, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28723074/paper-based-bimodal-sensor-for-electronic-skin-applications
#18
Minhyun Jung, Kyungkwan Kim, Bumjin Kim, Haena Cheong, Kwanwoo Shin, Oh-Sun Kwon, Jong-Jin Park, Sanghun Jeon
We present the development of a flexible bimodal sensor using a paper platform and inkjet printing method, which are suited for low-cost fabrication processes and realization of flexible devices. In this study, we employed a vertically stacked bimodal device architecture in which a temperature sensor is stacked on top of a pressure sensor and operated on different principles, allowing the minimization of interference effects. For the temperature sensor placed in the top layer, we used the thermoelectric effect and formed a closed-loop thermocouple composed of two different printable inks (conductive PEDOT:PSS and silver nanoparticles on a flexible paper platform) and obtained temperature-sensing capability over a wide range (150 °C)...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28715109/polymeric-monolith-column-composited-with-multiwalled-carbon-nanotubes-%C3%AE-cyclodextrin-for-the-selective-extraction-of-psoralen-and-isopsoralen
#19
Xu Ling, Li Zou, Zilin Chen
A polymeric column that contains a multiwalled carbon nanotubes-β-cyclodextrin composite was developed. The composite was wrapped into the poly(butyl methacrylate-ethylene dimethacrylate) monolith column (0.76 mm I.D. and 10 cm in length). The column was then applied for the online solid-phase microextraction of psoralen and isopsoralen from Fructus Psoraleae. Following microextraction, the coumarins were quantified by high-performance liquid chromatography with C18 separation column and UV detection. The effects of sample flow rate, sample volume and pH value were optimized...
July 17, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28714204/investigation-on-the-ph-independent-photoluminescence-emission-from-carbon-dots-impregnated-on-polymer-matrix
#20
Pichan Saheeda, Kaviladath Sabira, Mohandas Dhaneesha, Sankaran Jayaleksmi
Highly luminescent, polymer nanocomposite films based on poly(vinyl alcohol) (PVA), and monodispersed carbon dots (C-dots) derived from multiwalled carbon nanotubes (MWCNTs), as coatings on substrates as well as free standing ones are obtained via solution-based techniques. The synthesized films exhibit pH-independent photoluminescence (PL) emission, which is an advantageous property compared with the pH-dependent photoluminescence intensity variations, generally observed for the C-dots dispersed in aqueous solution...
July 17, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
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