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https://www.readbyqxmd.com/read/29902943/preferred-sampler-inlet-configurations-for-collection-of-aerosolized-nano-scale-materials
#1
John Jankovic, Tracy L Zontek, Megan Moore, Burton R Ogle, Scott Hollenbeck
BACKGROUND: Due to the lack of standard industrial hygiene sampling protocols for collection of nano-scale materials, sampling inlet device selection is left to individual researchers and professionals. OBJECTIVE: The objective of this study was to compare nano-scale aspiration efficiency for common inlet configurations with that of an open-ended sampler tube that is a commonly used inlet for direct reading instruments such as a condensation particle counter. METHODS: A polydisperse aerosol was generated using an electric motor as the aerosol source...
June 14, 2018: International Journal of Occupational and Environmental Health
https://www.readbyqxmd.com/read/29882060/exploring-the-ancestry-differentiation-and-inference-capacity-of-the-28-plex-aisnps
#2
Wei-Qi Hao, Jing Liu, Li Jiang, Jun-Ping Han, Ling Wang, Jiu-Ling Li, Quan Ma, Chao Liu, Hui-Jun Wang, Cai-Xia Li
Inferring an unknown DNA's ancestry using a set of ancestry-informative single nucleotide polymorphisms (SNPs) in forensic science is useful to provide investigative leads. This is especially true when there is no DNA database match or specified suspect. Thus, a set of SNPs with highly robust and balanced differential power is strongly demanded in forensic science. In addition, it is also necessary to build a genotyping database for estimating the ancestry of an individual or an unknown DNA. For the differentiation of Africans, Europeans, East Asians, Native Americans, and Oceanians, the Global Nano set that includes just 31 SNPs was developed by de la Puente et al...
June 7, 2018: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/29881843/size-dependent-surface-charge-properties-of-silica-nano-channels-double-layer-overlap-and-inlet-outlet-effects
#3
Tumcan Sen, Murat Barisik
Transport inside nano-channels and tubes is highly dependent on their surface charge properties. While previous studies assume that the charge density of a surface is a material property and independent of confinement size, this study properly characterized the surface charge of a nanochannel as a function of channel height and length under various solution conditions. By calculating the local surface charge based on local ionic concentrations, the surface charge of a nano-channel was studied by considering the effects of both overlapping electrical double layers (EDLs) and inlet/outlet regions...
June 8, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29863833/band-to-band-tunneling-dominated-thermo-enhanced-field-electron-emission-from-p-si-zno-nano-emitters
#4
Zhizhen Huang, Yifeng Huang, Ningsheng Xu, Jun Chen, Juncong She, Shaozhi Deng
Thermo-enhancement is an effective way to achieve high performance field electron emitters, and enables the individually tuning on the emission current by temperature and the electron energy by voltage. The field emission current from metal or n-doped semiconductor emitter at a relatively lower temperature (i.e., < 1000 K) is less temperature sensitive due to the weak dependence of free electron density on temperature, while that from p-doped semiconductor emitter is restricted by its limited free electron density...
June 4, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29760716/metabolomic-fingerprints-of-individual-algal-cells-using-the-single-probe-mass-spectrometry-technique
#5
Mei Sun, Zhibo Yang, Boris Wawrik
Traditional approaches for the assessment of physiological responses of microbes in the environment rely on bulk filtration techniques that obscure differences among populations as well as among individual cells. Here, were report on the development on a novel micro-scale sampling device, referred to as the "Single-probe," which allows direct extraction of metabolites from living, individual phytoplankton cells for mass spectrometry (MS) analysis. The Single-probe is composed of dual-bore quartz tubing which is pulled using a laser pipette puller and fused to a silica capillary and a nano-ESI...
2018: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29733549/toxicological-profiling-of-highly-purified-single-walled-carbon-nanotubes-with-different-lengths-in-the-rodent-lung-and-escherichia-coli
#6
Xiang Wang, Jae-Hyeok Lee, Ruibin Li, Yu-Pei Liao, Joohoon Kang, Chong Hyun Chang, Linda M Guiney, Vahid Mirshafiee, Linjiang Li, Jianqin Lu, Tian Xia, Mark C Hersam, André E Nel
Carbon nanotubes (CNTs) exhibit a number of physicochemical properties that contribute to adverse biological outcomes. However, it is difficult to define the independent contribution of individual properties without purified materials. A library of highly purified single-walled carbon nanotubes (SWCNTs) of different lengths is prepared from the same base material by density gradient ultracentrifugation, designated as short (318 nm), medium (789 nm), and long (1215 nm) SWCNTs. In vitro screening shows length-dependent interleukin-1β (IL-1β) production, in order of long > medium > short...
May 7, 2018: Small
https://www.readbyqxmd.com/read/29696065/physiochemical-properties-of-experimental-nano-hybrid-mta
#7
Vagharedin Akhavan Zanjani, Kasra Tabari, Seyedeh Mahsa Sheikh-Al-Eslamian, Ahmad Najafi Abrandabadi
Introduction: The development of new pulp capping agents has paved the way towards the preservation of pulp vitality, which is an important goal in restorative dentistry. This study sought to assess the calcium ion release, pH and setting of mineral trioxide aggregate (MTA) Angelus, an experimental formulation of nano-hybrid MTA containing nano-SiO2, nano-Al2O3 and nano-TiO2 and MTA Angelus plus nano-oxides. Methods: In this experimental study, five specimens from each material were placed in polypropylene tubes and immersed in a flask containing deionized distilled water...
January 2018: Journal of Medicine and Life
https://www.readbyqxmd.com/read/29642830/-a-new-strategy-for-enhancing-acanthamoebicidal-activity-with-synthesis-of-nanoflower-of-laurocerausus-officinalis-roemer-cherry-laurel-fruit-extracts
#8
Ayşe Baldemir, Ülkü Karaman, Sadi Yusufbeyoğlu, Ayşe Eken, Nilay Ildız, Selen İlgün, Cemil Çolak, Gamze Kaçmaz, İsmail Öçsoy, Soner Çankaya
Pathogenic Acanthamoeba species often cause infection known as Acanthamoeba keratitis among people who use contact lenses. It is a type of infection that can result in corneal ulceration, visual loss or even blindness, if not treated. There are various therapeutic options available in the treatment of Acanthamoeba infections but they are usually tough treatments with limited efficacy. For instance, hydrogen peroxide (H2 O2 ) is a commonly used contact lens disinfectant which is effective against Acanthamoeba but it is toxic to the cornea...
January 2018: Mikrobiyoloji Bülteni
https://www.readbyqxmd.com/read/29594451/a-nanocomposite-prepared-from-a-polypyrrole-deep-eutectic-solvent-and-coated-onto-the-inner-surface-of-a-steel-capillary-for-electrochemically-controlled-microextraction-of-acidic-drugs-such-as-losartan
#9
Hamid Asiabi, Yadollah Yamini, Maryam Shamsayei, Jamshid Azarnia Mehraban
The authors describe a new coating for use in electrochemically controlled in-tube solid phase microextraction (EC-IT-SPME). It consists of a nanocomposite that was prepared from polypyrrole and deep eutectic solvent (DES) by electrochemical deposition on the inner walls of a stainless steel capillary that serves as a working electrode. The hypertension drug losartan acts as an acidic model analyte. The extraction efficiency, mechanical stability, chemical stability and lifetime of the coating were investigated...
February 12, 2018: Mikrochimica Acta
https://www.readbyqxmd.com/read/29580402/preparation-and-characterization-of-green-nano-composite-material-based-on-polyaniline-multiwalled-carbon-nano-tubes-and-carboxymethyl-cellulose-for-electrochemical-sensor-applications
#10
Vineeta Gautam, Karan Pratap Singh, Vijay Laxmi Yadav
In this paper, we are presenting the preparation and characterization of "polyaniline/multiwalled carbon nanotubes/carboxymethyl cellulose" based novel composite material. It's morphological, thermal, structural, and electrochemical properties were investigated by using different instrumental techniques. During the in-situ chemical polymerization of aniline in the aqueous suspension of CMC and MWCNTs, the particle size change in two different ways "top to bottom" (low molecular weight oligomers grows in size) and "bottom to top" (long fibers of CMC fragmented in the reaction mixture)...
June 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29557785/controlled-fabrication-of-electrically-contacted-carbon-nanoscrolls
#11
Marek E Schmidt, Ahmed M M Hammam, Takuya Iwasaki, Teruhisa Kanzaki, Manoharan Muruganathan, Shinichi Ogawa, Hiroshi Mizuta
Carbon nanoscrolls (CNS) with their open ended morphology have recently attracted interest due to the potential application in gas capture, biosensors and interconnects. However, CNS currently suffer from the same issue that have hindered widespread integration of CNTs in sensors and devices: formation is done ex situ, and the tubes have to be placed with precision and reliability-a difficult task with low yield. Here, we demonstrate controlled in situ formation of electrically contacted CNS from suspended graphene nanoribbons with slight tensile stress...
June 8, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29470417/ultrarapid-multimode-microwave-synthesis-of-nano-submicron-%C3%AE-sic
#12
Min Zhao, Michael Johnson, Wenzhi He, Guangming Li, Chen Zhao, Luling Yu, Juwen Huang, Haochen Zhu
This paper presents the design, development and realization of a fast and novel process for the synthesis of 3C silicon carbide (β-SiC) nanorods and submicron powder. Using SiO₂ (or Si) and activated carbon (AC), this process allows β-SiC to be synthesized with almost 100% purity in timeframes of seconds or minutes using multimode microwave rotary tube reactors under open-air conditions. The synthesis temperature used was 1460 ± 50 °C for Si + AC and 1660 ± 50 °C for SiO₂ + AC. The shortest β-SiC synthesis time achieved was about 20 s for Si + AC and 100 s for SiO₂ + AC...
February 22, 2018: Materials
https://www.readbyqxmd.com/read/29457588/tio-2-nanotubes-with-different-spacing-fe-2-o-3-decoration-and-their-evaluation-for-li-ion-battery-application
#13
Selda Ozkan, Gihoon Cha, Anca Mazare, Patrik Schmuki
In the present work, we report on the use of organized TiO2 nanotube (NT) layers with a regular intertube spacing for the growth of highly defined α-Fe2 O3 nano-needles in the interspace. These α-Fe2 O3 decorated TiO2 NTs are then explored for Li-ion battery applications and compared to classic close-packed (CP) NTs that are decorated with various amounts of nanoscale α-Fe2 O3 . We show that NTs with tube-to-tube spacing allow uniform decoration of individual NTs with regular arrangements of hematite nano-needles...
May 11, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29448616/flame-retardant-effect-of-nano-fillers-on-polydimethylsiloxane-composites
#14
Pravin Jagdale, Samera Salimpour, Md Hujjatul Islam, Fabio Cuttica, Francisco C Robles Hernandez, Alberto Tagliaferro, Alberto Frache
Polydimethylsiloxane has exceptional fire retardancy characteristics, which make it a popular polymer in flame retardancy applications. Flame retardancy of polydimethylsiloxane with different nano fillers was studied. Polydimethylsiloxane composite fire property varies because of the shape, size, density, and chemical nature of nano fillers. In house made carbon and bismuth oxide nano fillers were used in polydimethylsiloxane composite. Carbon from biochar (carbonised bamboo) and a carbon by-product (carbon soot) were selected...
February 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29448496/mechanical-property-of-tio%C3%A2-nano-tubes-surface-based-on-the-investigation-of-residual-stress-tensile-force-and-fluid-flow-shear-stress-for-potential-application-of-cardiovascular-devices
#15
Zi-Kun He, Jing-An Li, Xiao Luo, Dan Zou, Ping Yang, An-Sha Zhao, Nan Huang
The TiO2 nanotube has been anticipated for potential application for cardiovascular implanted devices for its excellent drug loading/release function and biocompatibility. However, its mechanical behavior has rarely been studied as the cardiovascular devices. The tube length is a crucial factor which not only decides the drug loading ability but also influences the devices' mechanical behavior. Therefore, in this work, the TiO2 nanotubes with different tube length (NT2, NT4 and NT6) were fabricated, and their surface energy, residual stress, tensile tolerability and blood flow shear stress tolerability were determined, respectively...
February 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29445711/in-vitro-study-of-photothermal-anticancer-activity-of-carboxylated-multiwalled-carbon-nanotubes
#16
M H Bahreyni-Toosi, M H Zare, A Ale-Davood, M T Shakeri, S Soudmand
Background and Objective: Multi-walled Carbon Nano Tubes (MWCNTs) as an important element of nanosciences have a remarkable absorption in the region of NIR window (650-900 nm) which can overcome the limitations of deep treatment in photothermal therapy. To disperse MWCNTs in water, it is proposed to attach carboxylated functional group (-COOH) to MWCNTs in order to increase dispersivity in water. Materials and Methods: A stable suspension of MWCNTs-COOH with different concentrations (from 2...
December 2017: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/29442873/magnetic-properties-of-nano-maghemites-with-different-crystal-shapes
#17
Yen-Hua Chen, Jia-Fang Zhang
The differences between the macroscopic and microscopic magnetic properties of granular, rod, and tubular nano-maghemites were studied. The macroscopic magnetic properties of the different nano-maghemites were all ferrimagnetic by using a superconducting quantum interference device (SQUID). However, the coercive magnetic field and magnetization per unit volume were both in the orders of grain > tube > rod, which indicated that the crystal shape influenced macroscopic magnetic properties. A magnetic force microscope (MFM) was used to observe the microscopic magnetic structures; the samples were all magnetic in multiple domains, but the form and distribution of these domains were different...
May 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29429676/sonochemical-synthesis-of-a-novel-nanoscale-1d-lead-ii-pb-2-l-2-i-4-n-coordination-polymer-survey-of-temperature-reaction-time-parameters
#18
Payam Hayati, Salvio Suárez-García, Angel Gutiérrez, Daniel Ruiz Molina, Ali Morsali, Ali Reza Rezvani
One new lead(II) coordination supramolecular complex (CSC) (1D), [Pb2 (L)2 (I)4 ]n , L  =  C4 H6 N2 (1-methyl imidazole), has been synthesized under different experimental conditions. Micrometric crystals (bulk) or nano-sized materials have been obtained depending on using the branch tube method or sonochemical irradiation. All materials have been characterized by scanning electron microscopy (SEM), powder X-ray diffraction (PXRD) and FT-IR spectroscopy. Single crystal X-ray analyses on complex 1 showed that Pb2+ ion is 4-coordinated...
April 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29385892/comparative-toxicity-of-three-differently-shaped-carbon-nanomaterials-on-daphnia-magna-does-a-shape-effect-exist
#19
Renato Bacchetta, Nadia Santo, Irene Valenti, Daniela Maggioni, Mariangela Longhi, Paolo Tremolada
The acute toxicity of three differently shaped carbon nanomaterials (CNMs) was studied on Daphnia magna, comparing the induced effects and looking for the toxic mechanisms. We used carbon nano-powder (CNP), with almost spherical primary particle morphology, multi-walled carbon nanotubes (CNTs), tubes of multi-graphitic sheets, and cubic-shaped carbon nanoparticles (CNCs), for which no ecotoxicological data are available so far. Daphnids were exposed to six suspensions (1, 2, 5, 10, 20 and 50 mg L-1 ) of each CNM, and then microscopically analyzed...
April 2018: Nanotoxicology
https://www.readbyqxmd.com/read/29368394/complex-coronary-bifurcation-treatment-by-a-novel-stenting-technique-bench-test-fluid-dynamic-study-and-clinical-outcomes
#20
Gianluca Rigatelli, Marco Zuin, Fabio Dell'Avvocata, Dobrin Vassilev, Ramesh Daggubati, Thach Nguyen, Minh Trí Nhân Nguyễn, Nicolas Foin
OBJECTIVES: We assess the mid-term outcomes of ultrathin biodegradable polymer double stenting using a very minimal crushing (Nano-Crush) technique in large complex coronary bifurcation. BACKGROUND: Complex bifurcations have been suggested to be better approached by a planned double stent technique. METHODS: Two hundred and five consecutive patients (107 males and 98 females) referred for large complex coronary bifurcation percutaneous coronary interventions were enrolled...
January 25, 2018: Catheterization and Cardiovascular Interventions
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