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https://www.readbyqxmd.com/read/30110412/synthesis-and-characterization-of-zr-and-hf-doped-nano-tio-2-as-internal-standards-for-analytical-quantification-of-nanomaterials-in-complex-matrices
#1
Laura-Jayne A Ellis, Anastasios G Papadiamantis, Stefan Weigel, Eugenia Valsami-Jones
The reliable quantification of nanomaterials (NMs) in complex matrices such as food, cosmetics and biological and environmental compartments can be challenging due to interactions with matrix components and analytical equipment (vials and tubing). The resulting losses along the analytical process (sampling, extraction, clean-up, separation and detection) hamper the quantification of the target NMs in these matrices as well as the compatibility of results and meaningful interpretations in safety assessments...
June 2018: Royal Society Open Science
https://www.readbyqxmd.com/read/30049596/fatigue-behavior-and-crack-initiation-of-cad-cam-resin-composite-molar-crowns
#2
Satoshi Yamaguchi, Renshirou Kani, Kazuma Kawakami, Manami Tsuji, Sayuri Inoue, Chunwoo Lee, Wakako Kiba, Satoshi Imazato
OBJECTIVE: The aim of this study was to evaluate long-term fatigue behavior using an in vitro step-stress accelerated life test (SSALT), and to determine the crack initiation point using in silico finite element analysis for computer-aided designed and manufactured (CAD/CAM) molar crowns fabricated from three commercial CAD/CAM resin composite blocks: Cerasmart (CS; GC, Tokyo, Japan), Katana Avencia Block (KA; Kuraray Noritake Dental, Niigata, Japan), and Shofu Block HC (HC; Shofu, Kyoto, Japan)...
July 23, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/30044419/microstructures-and-compressive-properties-of-al-matrix-composites-reinforced-with-bimodal-hybrid-in-situ-nano-micro-sized-tic-particles
#3
Feng Qiu, Hao-Tian Tong, Yu-Yang Gao, Qian Zou, Bai-Xin Dong, Qiang Li, Jian-Ge Chu, Fang Chang, Shi-Li Shu, Qi-Chuan Jiang
Bimodal hybrid in-situ nano-/micro-size TiC/Al composites were prepared with combustion synthesis of Al-Ti-C system and hot press consolidation. Attempt was made to obtain in-situ bimodal-size TiC particle reinforced dense Al matrix composites by using different carbon sources in the reaction process of hot pressing forming. Microstructure showed that the obtained composites exhibited reasonable bimodal-sized TiC distribution in the matrix and low porosity. With the increasing of the carbon nano tube (CNT) content from 0 to 100 wt...
July 25, 2018: Materials
https://www.readbyqxmd.com/read/30037522/recent-achievements-in-enhancing-anaerobic-digestion-with-carbon-based-functional-materials
#4
REVIEW
Jishi Zhang, Wenqian Zhao, Huiwen Zhang, Zejie Wang, Chuanfang Fan, Lihua Zang
Carbon-based materials such as graphite, graphene, biochar, activated carbon, carbon cloth and nano-tube, and maghemite and magnetite carbons are capable for adsorbing chemicals onto their surfaces. Currently, this review is to highlight the relevance of carbons in enhancing hydrogen or methane production. Some key roles of carbons in improving cell growth, enrichment and activity, and accelerating their co-metabolisms were elaborated with regard to their effects on syntrophic communities, interspecies electron transfer, buffering capacity, biogas upgrading, and fertilizer nutrient retention and land application...
October 2018: Bioresource Technology
https://www.readbyqxmd.com/read/30015132/effect-of-irradiation-energy-and-residence-time-on-decomposition-efficiency-of-polycyclic-aromatic-hydrocarbons-pahs-from-rubber-wood-combustion-emission-using-soft-x-rays
#5
Jiraporn Chomanee, Surajit Tekasakul, Perapong Tekasakul, Masami Furuuchi
This research aims to investigate the effects of irradiation energy and residence time of soft X-ray irradiation in the decomposition of sixteen polycyclic aromatic hydrocarbons (PAHs) in smoke particles emitted from the Para rubber wood burning. The burning process was carried out in a tube furnace and the soft X-ray radiation used had a wave length of 0.13-0.41 nm. The irradiated (IR) and non irradiated (N-IR) smoke particles were collected simultaneously using a 10-stage Andersen sampler equipped with an inertial-filter stage (ANIF), in order to determine the physicochemical characteristic of both IR and N-IR smoke particles, including particle size distribution and concentration, and particle-bound PAHs concentration...
July 2, 2018: Chemosphere
https://www.readbyqxmd.com/read/29989404/controllable-assembly-of-flexible-protein-nanotubes-for-loading-multifunctional-modules
#6
Guibo Rao, Yan Fu, Na Li, Jiayi Yin, Jie Zhang, Manli Wang, Zhihong Hu, Sheng Cao
Viruses with filamentous morphologies, such as tobacco mosaic virus (TMV) and M13 bacteriophage, have long been studied as multivalent nanoscaffolds for loading functional motifs. Structural assembly of the capsid proteins (CPs) of filamentous viruses often requires the presence of DNA or RNA molecules, which has limited their applications. Here, we describe a strategy for controllable assembly of flexible bio-nanotubes consisting of Escherichia coli expressed CP of baculovirus Helicoverpa armigera nucleopolyhedrovirus (HearNPV) in vitro...
August 1, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29965470/-removal-efficiency-and-mechanism-of-removal-by-humic-acid-of-the-integrated-floc-ultrafiltration-process
#7
Wen-Jiang Li, Li-Fang Yu, Rui Miao, Bai-Wen Ma
In recent years, the integrated ultrafiltration (UF) membrane process has been widely used due to its high removal efficiency, slight membrane fouling, and small land use. However, a number of problems gradually occurred regarding the integrated UF process caused by the granular adsorbents used, such as powdered activated carbon, carbon nano-tube, nanoscale zerovalent iron, etc. Severe membrane surface damage was easily caused by these granular adsorbents after a long running time, and the cost of most adsorbents was very high...
March 8, 2018: Huan Jing Ke Xue= Huanjing Kexue
https://www.readbyqxmd.com/read/29956569/fabrication-of-a-nano-polymer-wrapping-meg3-shrna-plasmid-for-the-treatment-of-cerebral-infarction
#8
Junyi Shen, Zhiming Zhao, Wei Shang, Chunli Liu, Beibei Zhang, Zihan Xu, Hui Cai
Cerebral infarction is with poorer prognosis and high rates of mortality. After cerebral infarction, the promoting angiogenesis can accelerate the recovery of neurological function. Long non-coding RNA (LncRNA) maternally expressed gene 3 (Meg3) was overexpressed in cerebral infarction area and the knockdown of Meg3 promotes neovascularization and improves nerve function. In this study, we fabricated a nano-polymer wrapped Meg3 short hairpin RNA (ShRNA) plasmid to knockdown Meg3 and conjugated with OX26 antibody (MPO) to realize the brain targeting for the treatment of cerebral infarction...
June 29, 2018: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/29902943/preferred-sampler-inlet-configurations-for-collection-of-aerosolized-nano-scale-materials
#9
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
#10
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
#11
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 20, 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-nanoemitters
#12
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 27, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29760716/metabolomic-fingerprints-of-individual-algal-cells-using-the-single-probe-mass-spectrometry-technique
#13
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
#14
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...
June 2018: Small
https://www.readbyqxmd.com/read/29696065/physiochemical-properties-of-experimental-nano-hybrid-mta
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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