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https://www.readbyqxmd.com/read/29793170/effective-size-selection-of-mos-2-nanosheets-by-a-novel-liquid-cascade-centrifugation-influences-of-the-flakes-dimensions-on-electrochemical-and-photoelectrochemical-applications
#1
Marzieh Kajbafvala, Mansoor Farbod
Although liquid phase exfoliation is a powerful method to produce MoS2 nanosheets in large scale, but its effectiveness is limited by the diversity of produced nanosheets sizes. Here a novel approach for separation of MoS2 flakes having various lateral sizes and thicknesses based on the cascaded centrifugation has been introduced. This method involves a pre-separation step which is performed through low-speed centrifugation to avoid the deposition of large area single and few-layers by the heavier particles...
May 14, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29790860/long-lived-photoluminescence-polarization-of-localized-excitons-in-liquid-exfoliated-monolayer-enriched-ws-sub-2-sub
#2
Łukasz Kłopotowski, Nikodem Czechowski, Anatolie Mitioglu, Claudia Backes, Duncan K Maude, Paulina Plochocka
Monolayer transition metal dichalcogenides (TMDs) constitute a family of materials, in which coupled spin-valley physics can be explored and which could find applications in novel optoelectronic devices. However, before applications can be designed, a scalable method of monolayer extraction is required. Liquid phase exfoliation is a technique providing large quantities of the monolayer material, but the spin-valley properties of thus obtained TMDs are unknown. In this work, we employ steady-state and time-resolved photoluminescence (PL) to investigate the relaxation dynamics of localized excitons in liquid exfoliated WS<sub>2</sub>...
May 23, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29789419/detection-of-bladder-cancer-via-microfluidic-immunoassay-and-single-cell-dna-copy-number-alteration-analysis-of-captured-urinary-exfoliated-tumor-cells
#3
Anqi Chen, Guanghou Fu, Zhijie Xu, Yukun Sun, Xiaoyi Chen, Kok Suen Cheng, Kuang Hong Neoh, Zhewen Tang, Shifu Chen, Ming Liu, Tanxiao Huang, Yun Dai, Qibo Wang, Jing Jin, Baiye Jin, Ray P S Han
The increasing incidence of bladder cancer (BC) and its high rate of recurrence over a 5-year period necessitate the need for diagnosis and surveillance amelioration. Cystoscopy and urinary cytology are the current tools, and molecular techniques such as BTA stat, NMP22, survivin mRNA, and urovysion FISH have attracted attention, however, they suf-fer from insufficient sensitivity or specificity. We developed a novel microfluidic approach for harvesting intact urinary-exfoliated tumor cells (UETCs), either individually or in clus-ters, in a clean and segregated environment, which is crucial to minimize cross-contamination and misreads...
May 22, 2018: Cancer Research
https://www.readbyqxmd.com/read/29786932/bandgap-tunable-preparation-of-smooth-and-large-two-dimensional-antimonene
#4
Xin Wang, Junjie He, Benqing Zhou, Youming Zhang, Jiatao Wu, Rui Hu, Liwei Liu, Jun Song, Junle Qu
As a highly stable bandgap semiconductor, antimonene is an intriguing two-dimensional (2D) material in optoelectronics. However, its short layer distance and strong binding energy make it challenging to prepare high-quality large 2D antimonene; therefore, its predicted tunable bandgap has not been experimentally confirmed. In this work, we used a novel and simple approach to prepare smooth and large 2D antimonene with uniform layers through a pregrinding and subsequent sonication-assisted liquid-phase exfoliation process...
May 22, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29786447/thickness-tunable-synthesis-of-ultrathin-type-ii-dirac-semimetal-ptte-2-single-crystals-and-their-thickness-dependent-electronic-properties
#5
Huifang Ma, Peng Chen, Bo Li, Jia Li, Ruoqi Ai, Zhengwei Zhang, Guangzhuang Sun, Kangkang Yao, Zhaoyang Lin, Bei Zhao, Ruixia Wu, Xuwan Tang, Xidong Duan, Xiangfeng Duan
The recent discovery of topological semimetals has stimulated extensive research interest due to their unique electronic properties and novel transport properties related to a chiral anomaly. However, the studies to date are largely limited to bulk crystals and exfoliated flakes. Here, we report the controllable synthesis of ultrathin two-dimensional (2D) platinum telluride (PtTe2 ) nanosheets with tunable thickness and investigate the thickness-dependent electronic properties. We show that PtTe2 nanosheets can be readily grown, using a chemical vapor deposition approach, with a hexagonal or triangular geometry and a lateral dimension of up to 80 μm, and the thickness of the nanosheets can be systematically tailored from over 20 to 1...
May 22, 2018: Nano Letters
https://www.readbyqxmd.com/read/29782672/high-yield-production-of-monolayer-feps-3-quantum-sheets-via-chemical-exfoliation-for-efficient-photocatalytic-hydrogen-evolution
#6
Zhongzhou Cheng, Tofik Ahmed Shifa, Fengmei Wang, Yi Gao, Peng He, Kai Zhang, Chao Jiang, Quanlin Liu, Jun He
2D layered transition metal phosphorus trichalcogenides (MPX3 ) possess higher in-plane stiffness and lower cleavage energies than graphite. This allows them to be exfoliated down to the atomic thickness. However, a rational exfoliation route has to be sought to achieve surface-active and uniform individual layers. Herein, monolayered FePS3 quantum sheets (QSs) are systematically obtained, whose diameters range from 4-8 nm, through exfoliation of the bulk in hydrazine solution. These QSs exhibit a widened bandgap of 2...
May 21, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29781834/ocular-findings-in-exfoliation-syndrome
#7
Robert Ritch
Exfoliation syndrome (XFS) is characterized by numerous ocular manifestations, the most important of these being glaucoma and cataract. Its ocular manifestations affect all of the structures of the anterior segment as well as conjunctiva and orbital structures. Exfoliation material is seen most prominently as characteristic white deposits on the anterior surface of the lens and the pupillary border of the iris. Both open-angle and angle-closure glaucoma are intimately associated with XFS. Other findings include zonular disruption, iris sphincter fibrosis, keratopathy, ocular surface disease, and retinal vein occlusion...
May 17, 2018: Journal of Glaucoma
https://www.readbyqxmd.com/read/29781008/tl-2-s-a-metal-shrouded-two-dimensional-semiconductor
#8
Shiying Shen, Yan Liang, Yandong Ma, Baibiao Huang, Wei Wei, Ying Dai
Recently, the family of metal-shrouded two-dimensional (2D) crystals has expanded rapidly, although most of these crystals are metallic. Using first-principles, we identify a semiconducting 2D metal-shrouded crystal, namely the Tl2S monolayer, which is found to be thermally and dynamically stable, and should be readily exfoliated experimentally. Most importantly, Tl2S monolayers exhibit compelling electronic and photovoltaic properties, i.e., modulable bandgaps of 1.89-2.31 eV, strong light absorption and ideal photo-electricity transduction properties...
May 21, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29781007/inorganic-janus-nanosheets-bearing-two-types-of-covalently-bound-organophosphonate-groups-via-regioselective-surface-modification-of-k-4-nb-6-o-17-%C3%A2-3h-2-o
#9
Ryoko Suzuki, Mitsuhito Sudo, Megumi Hirano, Naokazu Idota, Masashi Kunitake, Taisei Nishimi, Yoshiyuki Sugahara
Janus nanosheets were prepared from K4Nb6O17·3H2O by modifying surfaces of their two distinct interlayers in a regioselective and sequential manner and subsequent exfoliation. The surface properties of nanosheets were investigated by phase atomic force microscopy imaging and two types of surfaces were discriminated, indicating that Janus nanosheets were successfully prepared.
May 21, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29778975/establishment-of-an-integration-free-induced-pluripotent-stem-cell-line-musii005-a-from-exfoliated-renal-epithelial-cells
#10
Bootsakorn Boonkaew, Weeradee Thummavichit, Ratchapong Netsrithong, Chinnavuth Vatanashevanopakorn, Kovit Pattanapanyasat, Methichit Wattanapanitch
Human induced pluripotent stem cells (iPSCs) were generated from exfoliated renal epithelial cells isolated from a urine sample of a 31-year-old healthy woman. Epithelial cells were characterized for the expression of E-cadherin and reprogrammed using non-integrating Sendai viral vectors. The urine-derived iPSC line (designated as MUSIi005-A) was karyotypically normal, expressed pluripotent markers, differentiated into cells of three embryonic germ layers, and showed no viral and transgene expressions at passage 29...
May 16, 2018: Stem Cell Research
https://www.readbyqxmd.com/read/29777814/effect-of-vinyl-montmorillonite-on-the-physical-responsive-and-antimicrobial-properties-of-the-optimized-polyacrylic-acid-chitosan-superabsorbent-via-box-behnken-model
#11
Mohamed S Abdel Aziz, Hend E Salama
This work aims to study the effect of a vinyl-modified montmorillonite (VMT) on the physical and antimicrobial properties of chitosan-graft-polyacrylic acid superabsorbent (Ch-g-PA). Ch-g-PA was first optimized using Box-Behnken Design to obtain the maximum equilibrium swelling, and the model was efficient to express the experimental swelling data (R2  = 0.999). VMT was further added to the optimized Ch-g-PA in different contents 0, 4, 7 and 10 wt%. FTIR confirmed the successful synthesis of the copolymers and their nanocomposites...
May 16, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29775861/screening-methylation-of-dna-repair-genes-in-the-oral-mucosa-of-chronic-smokers
#12
Celina Faig Lima Carta, Mônica Ghislaine Oliveira Alves, Patrícia Pimentel de Barros, Márcia Sampaio Campos, Jaqueline Scholz, Antonio Olavo Cardoso Jorge, Fábio Daumas Nunes, Janete Dias Almeida
OBJECTIVE: The aim of this study was to evaluate the epigenetic changes in the process of oral carcinogenesis by screening the methylation of repair genes in chronic smokers. DESIGN: Two groups were formed: Group 1: 16 smokers with consumption of 20 cigarettes/day for at least 10 years; and Group 2: 10 non-smoking. Exfoliative cytology of the tongue was performed, and the extracted DNA was treated by enzymes. The PCR Array System performed methylation screening to evaluate 22 DNA repair genes, and the results were validated by RT-qPCR for each gene with methylation levels ≥10%...
May 1, 2018: Archives of Oral Biology
https://www.readbyqxmd.com/read/29775049/bandgap-tunable-porous-borocarbonitrides-nanosheets-for-high-energy-density-supercapacitors
#13
Shouzhi Wang, Fukun Ma, Hehe Jiang, Yongliang Shao, Yongzhong Wu, Xiaopeng Hao
Bandgap tunable porous borocarbonitride (BCN) nanosheets were successfully fabricated with cheap and readily available precursors by annealing and exfoliating. The bandgap of the as-prepared BCN materials ranges from 5.5 eV to 1.0 eV, these samples exhibit beneficial structural features suitable for the application in supercapacitors (SCs). Especially, the BCN material with a bandgap of 1.0 eV exhibits great specific surface area (600.9 m2 g‒1), massive active sites and excellent conductivity (10.8 S m‒1)...
May 18, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29774992/interleukin-17a-promotes-osteogenic-differentiation-by-increasing-opg-rankl-ratio-in-stem-cells-from-human-exfoliated-deciduous-teeth-shed
#14
Alphonsa-Sebastian Alphy, Thirumulu-Ponnuraj Kannan, Mohd-Nor Norazmi, Asma-Abdullah Nurul
Stem cells derived from human exfoliated deciduous teeth (SHED) represent a promising cell source for bone tissue regeneration. The present study evaluated the effects of interleukin 17A (IL-17A) on the osteogenic differentiation of SHED. SHED were cultured in complete alpha minimum essential medium supplemented with osteoinducing reagents and treated with recombinant IL-17A. The cells were quantitatively analyzed for proliferative activity by MTS assay, cell markers expression as well as apoptotic activity by flow cytometry...
May 18, 2018: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/29774641/economizing-production-of-diverse-2d-layered-metal-hydroxides-for-efficient-overall-water-splitting
#15
Zongmin Zheng, Lele Lin, Shiguang Mo, Daohui Ou, Jing Tao, Ruixuan Qin, Xiaoliang Fang, Nanfeng Zheng
2D layered metal hydroxides (LMH) are promising materials for electrochemical energy conversion and storage. Compared with exfoliation of bulk layered materials, wet chemistry synthesis of 2D LMH materials under mild conditions still remains a big challenge. Here, an "MgO-mediated strategy" for mass production of various 2D LMH nanosheets is presented by hydrolyzing MgO in metal salt aqueous solutions at room temperature. Benefiting from this economical and scalable strategy, ultrathin LMH nanosheets (M = Ni, Fe, Co, NiFe, and NiCo) and their derivatives (e...
May 17, 2018: Small
https://www.readbyqxmd.com/read/29772181/prediction-of-isoelectric-point-of-manganese-and-cobalt-lamellar-oxides-application-to-controlled-synthesis-of-mixed-oxides
#16
Celine Tang, D Giaume, Liliane Guerlou-Demourgues, Grégory Lefèvre, Philippe Barboux
To design novel layered materials, bottom-up strategy is very promising. It consists in (1) synthesizing various layered oxides, (2) exfoliating them, then (3) restacking them in a controlled way. The latter step is based on electrostatic interactions between different layered oxides and is difficult to control. The aim of this study is to facilitate this step by predicting the isoelectric point (IEP) of exfoliated materials. Multisite Complexation model (MUSIC) was used in this objective and was shown to be able to predict IEP from the mean oxidation state of the metal in the (hydr)oxides, as the main parameter...
May 17, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29770604/synthesis-of-black-phosphorus-quantum-dots-with-high-quantum-yield-by-pulsed-laser-ablation-for-cell-bioimaging
#17
Xiaoling Zhang, Xin Ren, Fang Zhang
Black phosphorus quantum dots (BPQDs) with an average diameter of ≈ 6 nm and a height of ≈1.1 nm are successfully synthesized by using a pulsed laser ablation (PLA) method in isopropyl ether (IPE) solvent. PL quantum yield of the as-prepared sample is as high as 20.7% which is 3 times that of the BPQDs prepared by probe ultrasonic exfoliation (approximately 7.2%) for the first time. The stable and blue-violet photoluminescence (PL) emission of the BPQDs is observed, which is elucidated that electrons transit from the LUMO energy level to the HOMO energy level as well as energy levels below the HOMO ( H1 and H2 )...
May 16, 2018: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29769514/cleidocranial-dysplasia-presentation-of-clinical-and-radiological-features-of-a-rare-syndromic-entity
#18
R Modgil, K S Arora, A Sharma, S Mohapatra, S Pareek
Cleidocranial dysplasia is a developmental anomaly of the skeleton and the teeth. This condition may be inherited and be transmitted as dominant characteristics in either gender, or may appear spontaneously. It presents with skeletal defects of several bones, such as partial or complete absence of clavicles, late closure of the fontanels, presence of open skull sutures and multiple wormian bones. The dental manifestations are mainly delayed exfoliation of primary teeth and delayed eruption of permanent teeth with multiple impacted supernumerary teeth...
April 2018: Mymensingh Medical Journal: MMJ
https://www.readbyqxmd.com/read/29769429/mechanisms-involved-in-the-development-of-the-small-intestine-mucosal-layer-in-postnatal-piglets
#19
T H Skrzypek, W Kazimierczak, H Skrzypek, J L Valverde Piedra, M M Godlewski, R Zabielski
The use of complementary visualization and measurement techniques allowed accurate description and quantification of changes in the intestinal mucosal architecture and provided a comprehensive outlook on the dynamics of remodelling and maturation processes of the mucosal layer taking place in the small intestine of piglets from birth to weaning. The aim of the study was to examine the early postnatal development of the small intestine in pigs. Three techniques were used: scanning electron microscopy (measurements of villus density and shape, height of enterocytes and microvilli, cell exfoliation, and location of extrusion zones), optical microscopy (cross section, measurement of structures: villus length and width; crypt depth; mucosal thickness), and confocal microscopy (cell localization, apoptosis, exfoliation and migration)...
February 2018: Journal of Physiology and Pharmacology: An Official Journal of the Polish Physiological Society
https://www.readbyqxmd.com/read/29768821/preparation-of-ph-responsive-hollow-capsules-via-layer-by-layer-assembly-of-exfoliated-layered-double-hydroxide-nanosheets-and-polyelectrolytes
#20
Kiyofumi Katagiri, Yoshinori Shishijima, Kunihito Koumoto, Kei Inumaru
pH-Responsive smart capsules were developed by the layer-by-layer assembly with a colloidtemplating technique. Polystyrene (PS) particles were employed as core templates. Acid-soluble inorganic nanosheets were prepared from Mg-Al layered double hydroxide (LDH) by an exfoliation technique. LDH nanosheets and anionic polyelectrolytes were alternatively deposited on PS core particles by the layer-by-layer assembly using electrostatic interaction. Hollow capsules were obtained by the removal of the PS core particles...
January 1, 2018: Journal of Nanoscience and Nanotechnology
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