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https://www.readbyqxmd.com/read/29345038/electrocatalytic-activity-of-2d-phosphorene-based-heteroelectrocatalyst-for-photoelectrochemical-cells
#1
Munkhbayar Batmunkh, Aabhash Shrestha, Munkhjargal Bat-Erdene, Md Julker Nine, Cameron James Shearer, Christopher Gibson, Ashley Slattery, Sherif Tawfik, Michael Ford, Sheng Dai, Shizhang Qiao, Joseph George Shapter
Research into efficient synthesis, fundamental properties and potential applications of phosphorene is currently the subject of intense investigation. Herein, solution processed phosphorene or few-layer black phosphorus (FL-BP) sheets are prepared using microwave-exfoliation method and used in photoelectrochemical cells. Based on our experimental and theoretical (DFT) studies, we found that the FL-BP sheets can act as catalytically active sites and show excellent electrocatalytic activity for triiodide reduction in solar cells...
January 17, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29341505/stability-integrity-and-recovery-rate-of-cellular-nucleic-acids-preserved-in-a-new-liquid-based-cytology-medium
#2
Guodong Zhao, Zhaocheng Liu, Yaping Tian, Minsheng Zhu, Shouli Wang, Hui Wang, Shen Gao, Yong Ma, Minxue Zheng
BACKGROUND: Liquid-based cytology (LBC) has replaced the conventional Papanicolaou test in cervical cancer screening. The cervical swab specimens collected in LBC media can also be used for additional analyses including high-risk HPV (HR-HPV) test, DNA methylation analysis, and HPV E6/E7 mRNA test. METHODS: The stability, integrity, and recovery rate of cellular DNA and RNA after storage at different conditions were evaluated by a quantitative real-time PCR (qPCR) based HR-HPV test, reverse transcription qPCR (RT-qPCR), and agarose gel electrophoresis...
January 16, 2018: Diagnostic Cytopathology
https://www.readbyqxmd.com/read/29339285/facile-synthesis-and-rheological-characterization-of-nanocomposite-hyaluronan-organoclay-hydrogels
#3
J Mourycová, K K R Datta, A Procházková, M Plotěná, V Enev, J Smilek, J Másílko, M Pekař
We report a facile methodology for the synthesis of inorganic-organic hydrogels based on integrative assembly aminopropyl magnesium phyllosilicate (aminoclay) and sodium salt of hyaluronic acid. The viscoelastic materials produced by electrostatic interactions and crosslinking of hyaluronan in the presence of exfoliated synthetic organoclay results in the formation of gel-like behavior retaining a high amount of water. This was confirmed by a rheological study revealing significant dominance of the elastic response over the entire deformation frequency range used...
January 12, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29338484/the-association-between-micronucleus-nucleoplasmic-bridges-and-nuclear-buds-frequency-and-the-degree-of-uterine-cervical-lesions
#4
Goneta Gashi, Vesna Mahovlić, Suzana Manxhuka-Kerliu, Arjeta Podrimaj-Bytyqi, Luljeta Gashi, Isa R Elezaj
BACKGROUND AND AIM: The loss of genomic stability play an important role in carcinogenesis. Therefore, it is imperative to use certain biomarkers of DNA damage due to genomic instability in order to predict cancer risk. The aim of this study was the evaluation of genomic instability in patients with cervical lesions. MATERIALS AND METHODS: We investigated the genetic damages in 80 subjects: (40) patients with high grade squamous intraepithelial lesions (HSIL), (20) patients with invasive squamous cervical cancer (SCC) and (20) healthy women with a biomarker in two different tissues; the micronucleus (MN) test in peripheral blood lymphocytes (PBL), and in buccal exfoliated cells (BEC)...
January 17, 2018: Biomarkers: Biochemical Indicators of Exposure, Response, and Susceptibility to Chemicals
https://www.readbyqxmd.com/read/29338193/induction-of-chirality-in-two-dimensional-nanomaterials-chiral-2d-mos2-nanostructures
#5
Finn Purcell-Milton, Robert McKenna, Lorcan Brennan, Conor P Cullen, Lilian Guillemeney, Nikita V Tepliakov, Anvar S Baimuratov, Ivan D Rukhlenko, Tatiana S Perova, Georg S Duesberg, Alexander V Baranov, Anatoly V Fedorov, Yurii K Gun'ko
Two-dimensional (2D) nanomaterials have been intensively investigated due to their interesting properties and range of potential applications. Although most research has focused on graphene, atomic layered transition metal dichalcogenides (TMDs) and particularly MoS2 have gathered much deserved attention recently. Here we report the induction of chirality into 2D chiral nanomaterials by carrying out liquid exfoliation of MoS2 in the presence of chiral ligands (cysteine and penicillamine) in water. This processing resulted in exfoliated chiral 2D MoS2 nanosheets showing strong circular dichroism (CD) signals, which were far past the onset of the original chiral ligand signals...
January 16, 2018: ACS Nano
https://www.readbyqxmd.com/read/29337377/ultrafast-laser-shock-induced-confined-metaphase-transformation-for-direct-writing-of-black-phosphorus-thin-films
#6
Gang Qiu, Qiong Nian, Maithilee Motlag, Shengyu Jin, Biwei Deng, Yexin Deng, Adam R Charnas, Peide D Ye, Gary J Cheng
Few-layer black phosphorus (BP) has emerged as one of the most promising candidates for post-silicon electronic materials due to its outstanding electrical and optical properties. However, lack of large-scale BP thin films is still a major roadblock to further applications. The most widely used methods for obtaining BP thin films are mechanical exfoliation and liquid exfoliation. Herein, a method of directly synthesizing continuous BP thin films with the capability of patterning arbitrary shapes by employing ultrafast laser writing with confinement is reported...
January 16, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29337294/large-area-few-layers-hexagonal-boron-nitride-prepared-by-quadrupole-field-aided-exfoliation
#7
Lu Hanlun, Min Zhi Rong, Ming Qiu Zhang
A quadrupole electric field mediated exfoliation method is proposed to convert micron sized hexagonal boron nitride (hBN) powders into few layers hexagonal boron nitride nano-sheets (h-BNNS). Under the optimum conditions (400 Hz, 40 V, 32μg/mL, sodium deoxycholate, TAE medium), the hBN powders (thickness > 200 nm, horizontal scale ~ 10 μm) are successfully exfoliated into 0.5-4 nm (1-10 layers) thick h-BNNS with the same horizontal scale. Dynamic laser scattering (DLS) and atomic force microscope (AFM) statistics show that the yield is 47...
January 16, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29336931/impact-of-crack-cocaine-use-on-the-occurrence-of-oral-lesions-and-micronuclei
#8
R P Antoniazzi, F B Lago, L C Jardim, M R Sagrillo, K L Ferrazzo, C A Feldens
The aim of this study was to investigate the occurrence of oral lesions and micronuclei in crack cocaine users. A cross-sectional study was conducted involving 106 crack users and 106 non-users matched for age, sex, and tobacco use. Socio-demographic characteristics, the consumption of psychoactive substances, and the occurrence of fundamental lesions were investigated. Cellular changes in the oral mucosa (karyolysis, karyorrhexis, 'broken egg' events, and micronuclei) were determined by exfoliative cytology for 54 participants in each group...
January 11, 2018: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29335792/toward-exploring-the-structure-of-monolayer-to-few-layer-tas2-by-efficient-ultrasound-free-exfoliation
#9
Yiwei Hu, Qiaoyan Hao, Baichuan Zhu, Biao Li, Zhan Gao, Yan Wang, Kaibin Tang
Tantalum disulfide nanosheets have attracted great interest due to its electronic properties and device applications. Traditional solution-ased ultrasonic process is limited by ultrasound which may cause the disintegration into submicron-sized flake. Here, an efficient multi-step intercalation and ultrasound-free process has been successfully used to exfoliate 1T-TaS2. The obtained TaS2 nanosheets reveal an average thickness of 3 nm and several micrometers in size. The formation of few-layer TaS2 nanosheets as well as monolayer TaS2 sheets is further confirmed by atomic force microscopy images...
January 15, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29335183/microwave-assisted-synthesis-of-palladium-nanoparticles-intercalated-nitrogen-doped-reduced-graphene-oxide-and-their-electrocatalytic-activity-for-direct-ethanol-fuel-cells
#10
Rajesh Kumar, Everson T S G da Silva, Rajesh K Singh, Raluca Savu, Andrei V Alaferdov, Leandro C Fonseca, Lory C Carossi, Arvind Singh, Sarita Khandka, Kamal K Kar, Oswaldo L Alves, Lauro T Kubota, Stanislav A Moshkalev
Palladium nanoparticles decorated reduced graphene oxide (Pd-rGO) and palladium nanoparticles intercalated inside nitrogen doped reduced graphene oxide (Pd-NrGO) hybrids have been synthesized by applying a very simple, fast and economic route using microwave-assisted in-situ reduction and exfoliation method. The Pd-NrGO hybrids materials show good activity as catalyst for ethanol electro oxidation for direct ethanol fuel cells (DEFCs) as compared to Pd-rGO hybrids. The enhanced direct ethanol fuel cell can serve as alternative to fossil fuels because it is renewable and environmentally-friendly with a high energy conversion efficiency and low pollutant emission...
January 8, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29334393/facile-fabrication-and-characterization-of-two-dimensional-bismuth-iii-sulfide-nanosheets-for-high-performance-photodetector-applications-under-ambient-conditions
#11
Weichun Huang, Chenyang Xing, Yunzheng Wang, Zhongjun Li, Leiming Wu, Dingtao Ma, Xiaoyu Dai, Yuanjiang Xiang, Jianqing Li, Dianyuan Fan, Han Zhang
Two-dimensional (2D) bismuth(iii) sulfide (Bi2S3) nanosheets as non-toxic graphene-like nanomaterials were successfully fabricated by a facile liquid phase exfoliation (LPE) method. A robust photodetector employing a Bi2S3 nanosheet film has been fabricated for the first time via a facile fabrication process on an ITO-coated glass. UV-Vis and Raman spectroscopy techniques were carried out and they confirmed the inherent optical and physical properties of Bi2S3 nanosheets. Photoelectrochemical (PEC) measurements demonstrate that a significantly higher photocurrent density (42 μA cm-2) and enhanced photoresponsivity (210 μA W-1), at a lower bias potential in alkaline solution, of the Bi2S3 nanosheet-based photodetector are achieved, compared with those of other 2D nanomaterial-based photodetectors under light irradiation...
January 15, 2018: Nanoscale
https://www.readbyqxmd.com/read/29334096/microwave-induced-covalent-functionalization-of-few-layer-graphene-with-arynes-under-solvent-free-conditions
#12
M V Sulleiro, S Quiroga, D Peña, D Pérez, E Guitián, A Criado, M Prato
A non-conventional modification of exfoliated few-layer graphene (FLG) with different arynes under microwave (MW) irradiation and solvent-free conditions is reported. The described approach allows reaching fast, efficient and mild covalent functionalization of FLG.
January 15, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29334076/pt-decorated-mos-sub-2-sub-nanoflakes-for-ultrasensitive-resistive-humidity-sensor
#13
Debasree Burman, Sumita Santra, Panchanan Pramanik, Prasanta Kumar Guha
In this work, we report the fabrication of a low power, humidity sensor where platinum nanoparticles (NPs) decorated few-layered Molybdenum disulphide (MoS<sub>2</sub>) nanoflakes have been used as the sensing layer. A mixed solvent was used to exfoliate the nanoflakes from the bulk powder. Then the Pt/MoS<sub>2</sub> composites were prepared by reducing Pt NPs from chloroplatinic acid hexahydrate using a novel reduction technique using sulfide salt. The successful reduction and composite preparation were confirmed using various material characterization tools like Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), Transmission Electron Microscopy (TEM), X-Ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Raman spectroscopy and UV-visible spectroscopy (UV-Vis)...
January 15, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29332208/localised-aggressive-periodontitis-in-a-3-year-old-boy
#14
E Mass, F Hershkovitz, U Zilberman
BACKGROUND: Localised aggressive periodontitis (LAgP), characterised by rapid attachment and bone loss, which may occur in children and adolescents, without clinical evidence of systemic disease. CASE REPORT: Three-year-old boy was referred with excessive mobility of 83 and exfoliation of 73. Clinical examination revealed acceptable oral hygiene. Blood tests were performed to evaluate PMNs activity and the parents were advised to apply 0.2% chlorhexidine twice a day...
January 13, 2018: European Archives of Paediatric Dentistry: Official Journal of the European Academy of Paediatric Dentistry
https://www.readbyqxmd.com/read/29330376/layer-number-identification-of-cvd-grown-multilayer-graphene-using-si-peak-analysis
#15
You-Shin No, Hong Kyw Choi, Jin-Soo Kim, Hakseong Kim, Young-Jun Yu, Choon-Gi Choi, Jin Sik Choi
Since the successful exfoliation of graphene, various methodologies have been developed to identify the number of layers of exfoliated graphene. The optical contrast, Raman G-peak intensity, and 2D-peak line-shape are currently widely used as the first level of inspection for graphene samples. Although the combination analysis of G- and 2D-peaks is powerful for exfoliated graphene samples, its use is limited in chemical vapor deposition (CVD)-grown graphene because CVD-grown graphene consists of various domains with randomly rotated crystallographic axes between layers, which makes the G- and 2D-peaks analysis difficult for use in number identification...
January 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29329947/-pseudoexfoliation-syndrome-and-pseudoexfoliation-glaucoma
#16
REVIEW
C Schweitzer
Pseudoexfoliation syndrome is an age-related systemic disease that mainly affects the anterior structures of the eye. Despite a worldwide distribution, reported incidence and prevalence of this syndrome vary widely between ethnicities and geographical areas. The exfoliative material is composed mainly of abnormal cross-linked fibrils that accumulate progressively in some organs such as the heart, blood vessels, lungs or meninges, and particularly in the anterior structures of the eye. The exact pathophysiological process still remains unclear but the association of genetic and environmental factors are thought to play a role in the development and progressive extracellular accumulation of exfoliative material...
January 9, 2018: Journal Français D'ophtalmologie
https://www.readbyqxmd.com/read/29329220/electrostatic-deposition-of-large-surface-graphene
#17
Charles Trudeau, Laura-Isabelle Dion-Bertrand, Sankha Mukherjee, Richard Martel, Sylvain G Cloutier
This work describes a method for electrostatic deposition of graphene over a large area using controlled electrostatic exfoliation from a Highly Ordered Pyrolytic Graphite (HOPG) block. Deposition over 130 × 130 µm² with 96% coverage is achieved, which contrasts with sporadic micro-scale depositions of graphene with little control from previous works on electrostatic deposition. The deposition results are studied by Raman micro-spectroscopy and hyperspectral analysis using large fields of view to allow for the characterization of the whole deposition area...
January 12, 2018: Materials
https://www.readbyqxmd.com/read/29328941/production-of-mono-to-few-layer-mos2-nanosheets-in-isopropanol-by-a-salt-assisted-direct-liquid-phase-exfoliation-method
#18
Huaizhi Liu, Liao Xu, Weixu Liu, Bo Zhou, Yinyan Zhu, Lihua Zhu, Xiaoqing Jiang
Here, we report a facile salt-assisted direct liquid-phase exfoliation method for mass production of MoS2 nanosheets. We choose organic solvent isopropanol (IPA) as exfoliation media and potassium ferrocyanide, potassium sodium tartrate, or sodium tartrate as salt, the assistant. The selected salts show universal and efficient assistant effect for the exfoliation of MoS2 in IPA. Especially, potassium ferrocyanide (K4Fe(CN)6) can enhance the exfoliation efficiency up to 73 times and a dispersion of MoS2 nanosheets with concentration as high as 0...
January 6, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29327749/fabrication-of-high-performance-graphene-nanoplatelet-based-transparent-electrodes-via-self-interlayer-exfoliation-control
#19
Jong Sik Oh, Ji Soo Oh, Da In Sung, Geun Young Yeom
Graphene nanoplatelets (GNP) have attracted considerable attention due to their high yield and fabrication route that is scalable to enable graphene production. However, the absence of a means of fabricating a transparent and conductive GNP film has been the biggest obstacle to the replacement of pristine graphene. Here, we report on a novel means of fabricating uniform and thin GNP-based high-performance transparent electrodes for flexible and stretchable optoelectronic devices involving the use of an adhesive polymer layer (PMMA) as a GNP layer controller and by forming a hybrid GNP/AgNW electrode embedded on PET or PDMS...
January 12, 2018: Nanoscale
https://www.readbyqxmd.com/read/29325283/-upper-gastrointestinal-bleeding-caused-by-exfoliative-esophagitis-in-one-patient-with-hepatitis-b-cirrhosis
#20
C Y Wang, D S Hu, J Wen, W Lu, J Li
No abstract text is available yet for this article.
November 20, 2017: Zhonghua Gan Zang Bing za Zhi, Zhonghua Ganzangbing Zazhi, Chinese Journal of Hepatology
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