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https://www.readbyqxmd.com/read/28820599/optical-gating-of-black-phosphorus-for-thz-detection
#1
Martin Mittendorff, Ryan J Suess, Edward Leong, Thomas E Murphy
Photoconductive antennas are widely used for time-resolved detection of THz pulses. In contrast to photothermoelectric or bolometric THz detection, the coherent detection allows direct measurement of the electric field transient of a THz pulse, which contains both, spectral and phase information. In this letter we demonstrate for the first time photoconductive detection of free-space propagating THz radiation with thin flakes of a van der Waals material. Mechanically exfoliated flakes of black phosphorus are combined with an antenna that concentrates the THz fields to the small flake (~10 μm)...
August 18, 2017: Nano Letters
https://www.readbyqxmd.com/read/28820262/single-layer-tl2o-a-metal-shrouded-2d-semiconductor-with-high-electronic-mobility
#2
Yandong Ma, Agnieszka Kuc, Thomas Heine
First metal-shrouded two-dimensional semicon-ductor, single-layer Tl2O, is discussed from first-principles. It is thermally and dynamically stable, has a low cleavage energy call-ing for exfoliation from layered Tl2O bulk, and a very small inter-face mismatch compared to (001) Tl metal. Single-layer Tl2O ex-hibits a direct band gap of 1.56 eV and a very high charge carrier mobility of 4.3×103 cm2 V-1 s-1. The metal-shrouded 2D semicon-ductor promises interesting applications in 2D electronics. An in-triguing layer-thickness dependent direct-to-indirect bandgap tran-sition is observed, and contrary to early literature, the bulk is also a semiconductor...
August 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28820215/how-exfoliated-graphene-oxide-nanosheets-organize-at-the-water-interface-evidence-for-a-spontaneous-bilayer-self-assembly
#3
Nathalie Bonatout, François Muller, Philippe Fontaine, Ignacio Gascon, Oleg Konovalov, Michel Goldmann
In this study, we have characterized graphene oxide films formed at the air-water interface by X-ray reflectivity and grazing incidence X-ray diffraction using synchrotron sources. Surprisingly, the results of both measurements show that at non zero surface pressures, the film is organized as a bilayer of sheets interfaced between air and water with water molecule bridges. Such a spontaneous bilayer structure and its evolution with respect to the surface pressure has been observed for the first time. These results should allow precise control of the density of sheets deposited on the substrate when these films are transferred through the Langmuir Blodgett or Schaefer procedures...
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28816820/factors-that-influence-of-trabectome-surgery-for-glaucoma-patients
#4
Naoki Tojo, Shinya Abe, Atsushi Hayashi
BACKGROUND: The aim of this study was to investigate the factors that influence the outcome of trabectome surgery. METHODS: This was a retrospective nonrandomized study. Seventy-eight glaucoma patients (86 eyes) who underwent trabectome surgeries and were followed up for more than 12 months were included. We classified the subtypes of glaucoma as: primary open-angle glaucoma (23 eyes), pseudo-exfoliation glaucoma (58 eyes), and secondary glaucoma (5 eyes). Forty-seven eyes underwent cataract and trabectome surgeries simultaneously, and 39 underwent only trabectome surgery...
August 14, 2017: Journal of Glaucoma
https://www.readbyqxmd.com/read/28816428/aqueous-exfoliation-of-graphite-into-graphene-assisted-by-sulfonyl-graphene-quantum-dots-for-photonic-crystal-applications
#5
Minxiang Zeng, Smit A Shah, Dali Huang, Dorsa Parviz, Yi-Hsien Yu, Xuezhen Wang, Micah J Green, Zhengdong Cheng
We investigate the π-π stacking of polyaromatic hydrocarbons (PAHs) with graphene surfaces, showing that such interactions are general across a wide range of PAH sizes and species, including graphene quantum dots. We synthesized a series of graphene quantum dots with sulfonyl, amino and carboxylic functional groups and employed them to exfoliate and disperse pristine graphene in water. We observed that sulfonyl-functionalized graphene quantum dots were able to stabilize the highest concentration of graphene in comparison to other functional groups; this is consistent with prior findings by pyrene...
August 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28816270/-clinical-value-of-fluorescence-in-situ-hybridization-positive-of-exfoliated-urothelial-cells-in-urothelial-carcinoma
#6
J Y Liu, X Peng, X H Ning, T Li, S H Peng, J Y Wang, S J Liu, Y Ding, L Cai, K Gong
OBJECTIVE: To analyze the clinical pathologic characteristics of cases with fluorescence in situ hybridization (FISH) positive of exfoliated urothelial cells, so as to evaluate the clinical utility of FISH in the diagnosis of urothelial carcinoma (UC). METHODS: A total of 271 cases of FISH positive in Department of Urology of Peking University First Hospital from Apr. 2012 to Sep. 2015 were recruited in this study. Retrospective analysis was made on their clinical data...
August 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28816197/cytological-changes-in-normal-oral-mucosa-of-individuals-with-tobacco-habits-a-cytomorphometric-study
#7
Pavan Palakurthy, Pavan G Kulkarni, Rateesh K Nandan, T Madhusudan Rao, D Shyam P Reddy, Keerthi Muddana
INTRODUCTION: Oral cancer is one of the six most common cancers in the world, and globally more than 50% of head and neck cancers occur in Asia, remarkably in India. Overall, 200,000 cases of head and neck cancers occur each year in India, among which 80,000 are oral cancers. Epidemiological and clinical studies suggest a causative role of tobacco use in the evolution of oral potentially malignant and malignant disorders. AIMS AND OBJECTIVES: The aim of the study is to evaluate independently and compare the cytological effects of smoking, tobacco chewing, and smoking in conjunction with tobacco chewing on oral mucosa by cytomorphometric analysis...
August 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28811796/visual-outcome-after-phacoemulsification-with-lens-implant-in-diabetic-and-non-diabetic-patients-a-comparative-study
#8
Abdul Rashid Shaikh, Abdul Haleem Mirani, Muhammad Saleh Memon, Muhammad Faisal Fahim
OBJECTIVE: To compare the visual outcomes of phacoemulsification surgery with intraocular lens (IOL) in persons with and without diabetes at end of follow-up. METHODS: This was a comparative, cross sectional, observational study with Non-probability, purposive sampling. After approval from "Research Ethical Committee of Isra Post-graduate Institute of Ophthalmology Karachi, 92 patients with cataract in one eye were selected. Patients were divided into two groups...
May 2017: Pakistan Journal of Medical Sciences Quarterly
https://www.readbyqxmd.com/read/28809428/a-critical-role-of-catalyst-morphology-in-low-temperature-synthesis-of-carbon-nanotube-transition-metal-oxide-nanocomposite
#9
Xiaoyan Jin, Joohyun Lim, Yoonhoo Ha, Nam Hee Kwon, Hyeyoung Shin, In Young Kim, Nam-Suk Lee, Myung Hwa Kim, Hyungjun Kim, Seong-Ju Hwang
The effect of the catalyst morphology on the growth of carbon nanotubes (CNT) on nanostructured transition metal oxides was investigated to study a novel low-temperature synthetic route to functional CNT-transition metal oxide nanocomposites. Among several nanostructured manganese oxides with various morphologies and structures, only exfoliated 2D nanosheets of layered MnO2 acted as an effective catalyst for the chemical vapor deposition of CNT at low temperatures of 400-500 °C, which emphasizes the critical role of the catalyst morphology in CNT growth...
August 15, 2017: Nanoscale
https://www.readbyqxmd.com/read/28809109/characterization-of-rotational-stacking-layers-in-large-area-mose2-film-grown-by-molecular-beam-epitaxy-and-interaction-with-photon
#10
Yoon-Ho Choi, Dong-Hyeok Lim, Jae-Hun Jeong, Dambi Park, Kwang-Sik Jeong, Minju Kim, Aeran Song, Hee-Suk Chung, Kwun-Bum Chung, Yeonjin Yi, Mann-Ho Cho
Transition metal dichalcogenides (TMDCs) are promising next-generation materials for optoelectronic devices because, at sub-nanometer thicknesses, they have a transparency, flexibility, and band gap in the near-infrared to visible light range. In this study, we examined continuous, large-area MoSe2 film, grown by molecular beam epitaxy on an amorphous SiO2/Si substrate, which facilitated direct device fabrication without exfoliation. Spectroscopic measurements were implemented to verify the formation of a homogeneous MoSe2 film by performing mapping on the micrometer scale and measurements at multiple positions...
August 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28808327/spontaneous-detachment-of-streptococcus-mutans-biofilm-by-synergistic-effect-between-zwitterion-and-sugar-alcohol
#11
Jong Hyun Lim, Sang-Hun Song, Hyun-Sub Park, Jeong Rae Lee, Sang-Min Lee
A biofilm, a community of microorganisms, is highly resistant to antibiotics, resulting in massive losses in various areas. We herein present a strategy to remove Streptococcus mutans biofilms through a spontaneous exfoliation by the synergistic effect between zwitterion and sugar alcohols. It is assumed that the anionic site of zwitterion can be coupled with sugar alcohols and the cationic site remains in the state of lacking electrons. The cationic site allows the complexes to be delivered to negatively charged exopolysaccharides of biofilms...
August 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28807346/application-of-a-time-resolved-fluoroimmunoassay-for-detection-of-p16ink4a-in-cervix
#12
Li Ding, Qiong Chen, Wanting Fan, Xianjin Zou
OBJECTIVE: To establish a time-resolved fluoroimmunoassay (TRFIA) method to detect p16INK4a. METHODS: 119 cases of exfoliative cells following Thinprep cytologic test (TCT) test were selected for TRFIA and biopsy tissues of these patients according to TCT results were collected for immunohistochemical (IHC) staining. RESULTS: There were 40 cases with cervicitis, 16 cases of cervical intraepithelial neoplasia grade 1 (CIN1), 15 cases of CIN2, 26 cases of CIN3, and 22 cases of squamous cell carcinoma (SCC)...
August 2017: Annals of Diagnostic Pathology
https://www.readbyqxmd.com/read/28805394/high-efficiently-delaminated-single-layered-mxene-nanosheets-with-large-lateral-size
#13
Gengnan Li, Li Tan, Yumeng Zhang, Binghan Wu, Liang Li
Single layered Ti3C2(OH)2 nanosheets have been successfully fabricated by etching its Ti3AlC2 precursor with KOH in the presence of small amount of water. The OH group replaced the Al layer within Ti3AlC2 structure during etching process and Ti3C2(OH)2 nanosheets could be easily and efficiently achieved through a simple washing process. The delaminated single layered nanosheets are clearly revealed by atomic force microscopy to have several micrometers in lateral size. Interestingly, the exfoliated Ti3C2(OH)2 nanosheets could be restacked to form a new layer-structured material during drying process...
August 14, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28804926/van-der-waals-epitaxial-growth-of-2d-metallic-vanadium-diselenide-single-crystals-and-their-extra-high-electrical-conductivity
#14
Zhepeng Zhang, Jingjing Niu, Pengfei Yang, Yue Gong, Qingqing Ji, Jianping Shi, Qiyi Fang, Shaolong Jiang, He Li, Xiebo Zhou, Lin Gu, Xiaosong Wu, Yanfeng Zhang
2D metallic transition-metal dichalcogenides (MTMDs) have recently emerged as a new class of materials for the engineering of novel electronic phases, 2D superconductors, magnets, as well as novel electronic applications. However, the mechanical exfoliation route is predominantly used to obtain such metallic 2D flakes, but the batch production remains challenging. Herein, the van der Waals epitaxial growth of monocrystalline, 1T-phase, few-layer metallic VSe2 nanosheets on an atomically flat mica substrate via a "one-step" chemical vapor deposition method is reported...
August 14, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28802737/multi-biofunctional-polymer-graphene-composite-for-bone-tissue-regeneration-that-elutes-copper-ions-to-impart-angiogenic-osteogenic-and-bactericidal-properties
#15
L R Jaidev, Sachin Kumar, Kaushik Chatterjee
Despite several recent advances, poor vascularization in implanted scaffolds impedes complete regeneration for clinical success of bone tissue engineering. The present study aims to develop a multi-biofunctional nanocomposite for bone tissue regeneration using copper nanoparticle decorated reduced graphene oxide (RGO_Cu) hybrid particles in polycaprolactone (PCL) matrix (PCL/RGO_Cu). X-ray photoelectron spectroscopy and X-ray diffraction confirmed the presence of copper oxides (CuO and Cu2O) on RGO. Thermogravimetric analysis showed that 11...
August 4, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28799071/toward-single-atom-chains-with-exfoliated-tellurium
#16
Hugh O H Churchill, Gregory J Salamo, Shui-Qing Yu, Takayuki Hironaka, Xian Hu, Jeb Stacy, Ishiang Shih
We demonstrate that the atom chain structure of Te allows it to be exfoliated as ultra-thin flakes and nanowires. Atomic force microscopy of exfoliated Te shows that thicknesses of 1-2 nm and widths below 100 nm can be exfoliated with this method. The Raman modes of exfoliated Te match those of bulk Te, with a slight shift (4 cm(-1)) due to a hardening of the A1 and E modes. Polarized Raman spectroscopy is used to determine the crystal orientation of exfoliated Te flakes. These experiments establish exfoliation as a route to achieve nanoscale trigonal Te while also demonstrating the potential for fabrication of single atom chains of Te...
August 10, 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28797943/adsorption-study-of-selenium-ions-from-aqueous-solutions-using-mgo-nanosheets-synthesized-by-ultrasonic-method
#17
Wenwen Cui, Ping Li, Zheming Wang, Shili Zheng, Yi Zhang
MgO nanosheets with thickness ranges of 3-10 molecule layers and high specific area (166.44m(2)g(-1)) were successfully fabricated by an ultrasound-assisted exfoliation method and used as adsorbent for the removal of both selenite (Se(IV)) and selenate (Se(VI)) from aqueous solutions. The resulting MgO nanosheets displayed high maximum adsorption capacities of 103.52 and 10.28mgg(-1) for Se(IV) and Se(VI), respectively. ATR-FTIR and XPS spectroscopic results suggested that both Se(IV) and Se(VI) formed inner-sphere surface complexes on MgO nanosheets under the present experimental conditions...
August 1, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28797754/fabrication-of-metal-free-two-dimensional-two-dimensional-homojunction-photocatalyst-using-various-carbon-nitride-nanosheets-as-building-blocks
#18
Boyong Ye, Xiaoxue Han, Mengdie Yan, Huanhuan Zhang, Fengna Xi, Xiaoping Dong, Jiyang Liu
Semiconductor photocatalysis currently suffered three main problems, low solar energy utilization, high photo-generated charge recombination rate and the heavy metal ions release by the photo-corrosion. Herein, we developed a visible-light-driven homojunction photocatalyst with the metal-free two-dimensional (2D) graphitic carbon nitride nanosheets (CNNS). By employing liquid exfoliation and chemical blowing approaches, we obtained two kinds of CNNS materials (le-CNNS and cb-CNNS) with different band structures, and subsequently fabricated the homojunction photocatalyst...
August 2, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28792442/complex-determinants-of-epithelial-mesenchymal-phenotypic-plasticity-in-ovarian-cancer
#19
REVIEW
Yuliya Klymenko, Oleg Kim, M Sharon Stack
Unlike most epithelial malignancies which metastasize hematogenously, metastasis of epithelial ovarian cancer (EOC) occurs primarily via transcoelomic dissemination, characterized by exfoliation of cells from the primary tumor, avoidance of detachment-induced cell death (anoikis), movement throughout the peritoneal cavity as individual cells and multi-cellular aggregates (MCAs), adhesion to and disruption of the mesothelial lining of the peritoneum, and submesothelial matrix anchoring and proliferation to generate widely disseminated metastases...
August 9, 2017: Cancers
https://www.readbyqxmd.com/read/28783918/impact-of-polyethylene-microbeads-on-the-floating-freshwater-plant-duckweed-lemna-minor
#20
Gabriela Kalčíková, Andreja Žgajnar Gotvajn, Aleš Kladnik, Anita Jemec
Microplastics (MP), small plastic particles below 5 mm, have become one of the central concerns of environmental risk assessment. Microplastics are continuously being released into the aquatic environment either directly through consumer products or indirectly through fragmentation of larger plastic materials. The aim of our study was to investigate the effect of polyethylene microbeads from cosmetic products on duckweed (Lemna minor), a freshwater floating plant. The effects of microbeads from two exfoliating products on the specific leaf growth rate, the chlorophyll a and b content in the leaves, root number, root length and root cell viability were assessed...
August 2, 2017: Environmental Pollution
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