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https://www.readbyqxmd.com/read/29161677/nanotechnology-based-recent-approaches-for-sensing-and-remediation-of-pesticides
#1
REVIEW
Deepak Rawtani, Nitasha Khatri, Sanjiv Tyagi, Gaurav Pandey
Pesticides are meant to control and destroy the pests and weeds. They are classified into different categories on the basis their origin and type of pest they target. Chemical pesticides such as insecticides, herbicides and fungicides are commonly used in agricultural fields. However, the excessive use of these agrochemicals have adverse effects on environment such as reduced population of insect pollinators, threat to endangered species and habitat of birds. Upon consumption; chemical pesticides also cause various health issues such as skin, eye and nervous system related problems and cancer upon prolonged exposure...
November 18, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/29161515/potential-profile-of-stabilized-field-induced-lateral-p-n-junction-in-transition-metal-dichalcogenides
#2
Yijin Zhang, Ryuji Suzuki, Yoshihiro Iwasa
Electric field-induced p-n junctions are often used to realize peculiar functionalities in various materials. This method can be applied not only to conventional semiconductors but also to carbon nanotubes, graphene, and organic semiconductors to which the conventional chemical doping method is difficult to be applied. Transition-metal dichalcogenides (TMDs) are one of such materials where the field-induced p-n junctions play crucial roles in realizing solar cell and light-emitting diode operations as well as circularly polarized electroluminescence...
November 21, 2017: ACS Nano
https://www.readbyqxmd.com/read/29161037/biodegradation-of-carbon-nanotube-polymer-nanocomposites-using-a-monoculture
#3
David G Goodwin, Iruhany Boyer, Thomas Devahif, Cong Gao, Benjamin Frank, Xier Lu, Leo Kuwama, Tucker B Gordon, JingJing Wang, James F Ranville, Edward J Bouwer, D Howard Fairbrother
The biodegradation rates of carbon nanotube (CNT)/ polymer nanocomposites (PNCs) containing poly-ɛ-caprolactone (PCL) were investigated using Pseudomonas aeruginosa, a microorganism commonly found in the environment. CNT/PCL nanocomposite mass loss profiles revealed that the rate of PCL matrix biodegradation decreased systematically as the CNT loading increased from 0.1 to 10% w/w. Addition of even a low CNT loading (< 1% w/w) caused the CNT/PCL biodegradation rate constant to decrease by more than 50%...
November 21, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29160225/phosphatidylserine-targeted-single-walled-carbon-nanotubes-for-photothermal-ablation-of-bladder-cancer
#4
Needa A Virani, Carole Davis, Patrick McKernan, Paul Hauser, Robert E Hurst, Joel Slaton, Ricardo P Silvy, Daniel E Resasco, Roger G Harrison
Bladder cancer has a 60-70% recurrence rate most likely due to residual tumour left behind after a transurethral resection (TUR). Failure to completely resect the cancer can lead to recurrence and progression into higher grade tumours with metastatic potential. We present here a novel therapy to treat superficial tumours with the potential to decrease recurrence. The therapy is a heat-based approach in which bladder tumour specific single-walled carbon nanotubes (SWCNTs) are delivered intravesically at a very low dose (0...
November 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29159501/a-fundamental-study-of-photoluminescence-modulation-from-dna-wrapped-single-walled-carbon-nanotubes
#5
Shusuke Oura, Masahiro Ito, Yoshikazu Homma, Kazuo Umemura
In this study, we investigated the interaction of base sequence-assigned single-stranded DNA (ssDNA) molecules with the surfaces of single-walled carbon nanotube (SWNT)-thymine (T30)/cytosine (C30) hybrids (T30/C30-SWNT), by measuring the modulation of near-infrared (NIR) photoluminescence (PL). Significant PL shifts were observed when T30/C30-SWNTs were reacted with 30-mers of adenine (A30)/guanine (G30). In contrast, when non-complementary ssDNA was used, no significant energy shift was observed in the PL modulation except when T30-SWNTs were reacted with G30...
November 20, 2017: European Biophysics Journal: EBJ
https://www.readbyqxmd.com/read/29159356/influence-of-the-anatase-rutile-ratio-on-the-charge-transport-properties-of-tio2-nts-arrays-studied-by-dual-wavelength-opto-electrochemical-impedance-spectroscopy
#6
T Cottineau, H Cachet, V Keller, E M M Sutter
The modification of photo-generated charge transport properties in aligned titanium dioxide nanotubes (TiO2-NTs) regarding the anatase/rutile ratio was studied by photo-electrochemical methods. TiO2-NTs obtained by anodization were thermally treated under air flux at different temperatures to significantly modify the proportion of TiO2 anatase and rutile phases in the tubular structure. Material characterisation methods (XRD, SEM, UV-visible spectroscopy) were used to determine the characteristics of the different TiO2-NT electrodes in terms of dimensions, proportion of each phase and optical properties...
November 21, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29159232/application-of-bi-clustering-of-gene-expression-data-and-gene-set-enrichment-analysis-methods-to-identify-potentially-disease-causing-nanomaterials
#7
Andrew Williams, Sabina Halappanavar
This article contains data related to the research article 'Application of bi-clustering of gene expression data and gene set enrichment analysis methods to identify potentially disease causing nanomaterials' (Williams and Halappanavar, 2015) [1]. The presence of diverse types of nanomaterials (NMs) in commerce has grown significantly in the past decade and as a result, human exposure to these materials in the environment is inevitable. The traditional toxicity testing approaches that are reliant on animals are both time- and cost- intensive; employing which, it is not possible to complete the challenging task of safety assessment of NMs currently on the market in a timely manner...
December 2017: Data in Brief
https://www.readbyqxmd.com/read/29156620/stretchable-highly-durable-ternary-nanocomposite-strain-sensor-for-structural-health-monitoring-of-flexible-aircraft
#8
Feng Yin, Dong Ye, Chen Zhu, Lei Qiu, YongAn Huang
Harmonious developments of electrical and mechanical performances are crucial for stretchable sensors in structural health monitoring (SHM) of flexible aircraft such as aerostats and morphing aircrafts. In this study, we prepared a highly durable ternary conductive nanocomposite made of polydimethylsiloxane (PDMS), carbon black (CB) and multi-walled carbon nanotubes (MWCNTs) to fabricate stretchable strain sensors. The nanocomposite has excellent electrical and mechanical properties by intensively optimizing the weight percentage of conducting fillers as well as the ratio of PDMS pre-polymer and curing agent...
November 20, 2017: Sensors
https://www.readbyqxmd.com/read/29156255/competitive-adsorption-of-ppcp-and-humic-substances-by-carbon-nanotube-membranes-effects-of-coagulation-and-ppcp-properties
#9
Yifei Wang, Qing Yang, Junqing Dong, Haiou Huang
Natural organic matter (NOM) and pharmaceuticals and personal care products (PPCP) are known to compete for adsorption sites on carbon nanotubes (CNT), resulting in decreasing PPCP adsorption onto CNT. In this study, four types of PPCP, as such acetaminophen (AAP), caffeine (CAF), triclosan (TCS), and carbendazim (CBD) were used to investigate the effects of PPCP properties and NOM coagulation on the competitive adsorption of PPCP and NOM. Coagulation preferentially removed HS from a natural surface water, thereby increasing adsorption of AAP, CAF, TCS and CBD by 19%, 13%, 17% and 11%, respectively...
November 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29156237/skeleton-skin-structured-rgo-cnts-pani-composite-fiber-electrodes-with-excellent-mechanical-and-electrochemical-performance-for-all-solid-state-symmetric-supercapacitors
#10
Dong Liu, Pengcheng Du, Wenli Wei, Hongxing Wang, Qi Wang, Peng Liu
Polyaniline coated reduced graphene oxide/carbon nanotube composite fibers ((RGO/CNTs)@PANI, RCP) with skeleton/skin structure are designed as fiber-shaped electrodes for high performance all-solid-state symmetric supercapacitor. The one-dimensional reduced graphene oxide/carbon nanotube composite fibers (RGO/CNTs, RC) are prepared via a simple in-situ reduction of graphene oxide in presence of carbon nanotubes in quartz glass pipes, which exhibit excellent mechanical performance of >193.4 MPa of tensile strength...
November 10, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29156128/cyclic-peptide-polymer-nanotubes-as-efficient-and-highly-potent-drug-delivery-systems-for-organometallic-anticancer-complexes
#11
Sophie C Larnaudie, Johannes C Brendel, Isolda Romero-Canelón, Carlos Sanchez-Cano, Sylvain Catrouillet, Joaquin Sanchis, James P C Coverdale, Ji-Inn Song, Abraha Habtemariam, Peter J Sadler, Katrina A Jolliffe, Sebastien Perrier
Functional drug carrier systems have potential for increasing solubility and potency of drugs while reducing side effects. Complex polymeric materials, particularly anisotropic structures, are especially attractive due to their long circulation times. Here, we have conjugated cyclic peptides to the biocompatible polymer poly(2-hydroxypropyl methacrylamide) (pHPMA). The resulting conjugates were functionalised with organoiridium anticancer complexes. Small angle neutron scattering and static light scattering confirmed their self-assembly and elongated cylindrical shape...
November 20, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/29155710/dna-nanotubes-as-a-versatile-tool-to-study-semiflexible-polymers
#12
Jörg Schnauß, Martin Glaser, Jessica S Lorenz, Carsten Schuldt, Christin Möser, Martin Sajfutdinow, Tina Händler, Josef A Käs, David M Smith
Mechanical properties of complex, polymer-based soft matter, such as cells or biopolymer networks, can be understood in neither the classical frame of flexible polymers nor of rigid rods. Underlying filaments remain outstretched due to their non-vanishing backbone stiffness, which is quantified via the persistence length (lp), but they are also subject to strong thermal fluctuations. Their finite bending stiffness leads to unique, non-trivial collective mechanics of bulk networks, enabling the formation of stable scaffolds at low volume fractions while providing large mesh sizes...
October 25, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29155432/in-situ-formed-fe-n-doped-metal-organic-framework-carbon-nanotubes-graphene-hybrids-for-a-rechargeable-zn-air-battery
#13
Wenxiu Yang, Yelong Zhang, Xiangjian Liu, Lulu Chen, Jianbo Jia
This study presents an in situ route to produce 3D Fe-N doped metal organic framework@carbon nanotubes/graphene (Fe-MOF@CNTs-G) hybrids as efficient oxygen reduction reaction (ORR) catalysts in both basic and acidic solutions. A rechargeable zinc-air battery assembled with Fe-MOF@CNTs-G exhibits a lower charge/discharge overpotential than the commercial IrO2 + 20% Pt/C catalyst.
November 20, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29154051/ecotoxicological-effects-of-carbon-based-nanomaterials-in-aquatic-organisms
#14
REVIEW
Anna Freixa, Vicenç Acuña, Josep Sanchís, Marinella Farré, Damià Barceló, Sergi Sabater
An increasing amount of carbon-based nanomaterials (CNM) (mostly fullerenes, carbon nanotubes and graphene) has been observed in aquatic systems over the last years. However, the potential toxicity of these CNM on aquatic ecosystems remains unclear. This paper reviews the existing literature on the toxic effects of CNM in aquatic organisms as well as the toxic effects of CNM through influencing the toxicity of other micro-pollutants, and outlines a series of research needs to reduce the uncertainty associated with CNMs toxic effects...
November 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29153082/advances-in-sensing-and-biosensing-of-bisphenols-a-review
#15
REVIEW
Dhanjai, Ankita Sinha, Lingxia Wu, Xianbo Lu, Jiping Chen, Rajeev Jain
Bisphenols (BPs) are well known endocrine disrupting chemicals (EDCs) that cause adverse effects on the environment, biotic life and human health. BPs have been studied extensively because of an increasing concern for the safety of the environment and for human health. They are major raw materials for manufacturing polycarbonates, thermal papers and epoxy resins and are considered hazardous environmental contaminants. A vast array of sensors and biosensors have been developed for the sensitive screening of BPs based on carbon nanomaterials (carbon nanotubes, fullerenes, graphene and graphene oxide), quantum dots, metal and metal oxide nanocomposites, polymer nanocomposites, metal organic frameworks, ionic liquids and molecularly imprinted polymers...
January 15, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29152014/recent-progress-in-boron-nanomaterials
#16
REVIEW
Takahiro Kondo
Various types of zero, one, and two-dimensional boron nanomaterials such as nanoclusters, nanowires, nanotubes, nanobelts, nanoribbons, nanosheets, and monolayer crystalline sheets named borophene have been experimentally synthesized and identified in the last 20 years. Owing to their low dimensionality, boron nanomaterials have different bonding configurations from those of three-dimensional bulk boron crystals composed of icosahedra or icosahedral fragments. The resulting intriguing physical and chemical properties of boron nanomaterials are fascinating from the viewpoint of material science...
2017: Science and Technology of Advanced Materials
https://www.readbyqxmd.com/read/29150653/a-theoretical-quest-for-high-temperature-superconductivity-on-the-example-of-low-dimensional-carbon-structures
#17
C H Wong, R Lortz, E A Buntov, R E Kasimova, A F Zatsepin
High temperature superconductivity does not necessarily require correlated electron systems with complex competing or coexisting orders. Instead, it may be achieved in a phonon-mediated classical superconductor having a high Debye temperature and large electronic density of states at the Fermi level in a material with light atoms and strong covalent bonds. Quasi-1D conductors seem promising due to the Van Hove singularities in their electronic density of states. In this sense, quasi-1D carbon structures are good candidates...
November 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29149996/coupling-of-two-centrifugeless-ultrasound-assisted-dispersive-solid-liquid-phase-microextractions-as-a-highly-selective-clean-and-efficient-method-for-determination-of-ultra-trace-amounts-of-non-steroidal-anti-inflammatory-drugs-in-complicated-matrices
#18
Somayeh Arghavani-Beydokhti, Maryam Rajabi, Alireza Asghari
In this work, a new, simple, rapid, and environmentally friendly method with a high sample clean-up capability termed as centrifugeless ultrasound-assisted dispersive micro solid-phase extraction coupled with salting-out ultrasound-assisted liquid-liquid microextraction based on solidification of a floating organic droplet followed by high performance liquid chromatography is introduced for the first time. In this method, the three non-steroidal anti-inflammatory drugs diclofenac, ibuprofen, and mefenamic acid are first extracted based on an effective nanoadsorbent named as the layered double hydroxide-carbon nanotube nanohybrid...
January 2, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29149445/the-influences-of-separators-on-capacitive-deionization-systems-in-the-cycle-of-adsorption-and-desorption
#19
Qihan Yao, Zhou Shi, Qingqing Liu, Zhengyang Gu, Ruihuan Ning
This research focused on the influence of different separator compartments on the performance of capacitive deionization (CDI) cells in terms of brackish water treatment. For comparison, different separators including filter paper(FP), carbon nanotube (CNT), and stainless steel fiber (SSF) on deionization and desorption rate of salt were examined. The best performance was obtained when the CNT separator was packed, followed by SSF and FP. Reducing the cell voltage from 1.2 to 0.4 V decreased the salt removal and electrode regeneration rate of SSF-CDI...
November 17, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29148805/near-infrared-quantum-dot-emission-enhanced-by-stabilized-self-assembled-j-aggregate-antennas
#20
Francesca S Freyria, José M Cordero, Justin R Caram, Sandra Doria, Amro Dodin, Yue Chen, Adam P Willard, Moungi G Bawendi
Enhancing photoluminescent emission (PL) in the near-infrared-infrared (NIR-IR) spectral region has broad applications from solar energy conversion to biological imaging. We show that self-assembled molecular dye J-aggregates (light-harvesting nanotubes, LHNs) can increase the PL emission of NIR PbS quantum dots (QDs) in both liquid and solid media more than 8-fold, promoted primarily by a long-range antenna effect and efficient Förster resonance energy transfer (FRET) from donor to acceptor. To create this composite material and preserve the optical properties of the nanocrystals, we performed an in situ ligand substitution followed by a functionalization reaction using click-chemistry...
November 17, 2017: Nano Letters
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