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Exfoliation

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https://www.readbyqxmd.com/read/28102670/microfluidization-of-graphite-and-formulation-of-graphene-based-conductive-inks
#1
Panagiotis G Karagiannidis, Stephen A Hodge, Lucia Lombardi, Flavia Tomarchio, Nicolas Decorde, Silvia Milana, Ilya Goykhman, Yang Su, Steven V Mesite, Duncan N Johnstone, Rowan K Leary, Paul A Midgley, Nicola M Pugno, Felice Torrisi, Andrea C Ferrari
We report the exfoliation of graphite in aqueous solutions under high shear rate turbulent flow conditions, with a 100\% exfoliation yield. The material is stabilized without centrifugation at concentrations up to 100 g/L using carboxymethylcellulose sodium salt to formulate conductive printable inks. The sheet resistance of blade coated films is below~2Ω/□. This is a simple and scalable production route for conductive inks for large area printing in flexible electronics.
January 19, 2017: ACS Nano
https://www.readbyqxmd.com/read/28101180/acute-renal-injury-induced-by-valacyclovir-hydrochloride-a-case-report
#2
Yanning Zhang, Yuxi Cong, Yan Teng
Acyclovir has been a frequently used antiviral agent in the clinical treatment of leukemia, acute encephalitis, malignant tumor and herpes simplex. The adverse effects of this drug have been widely described in clinical practice. In the present study, a case of a 35-year-old female patient diagnosed with herpes simplex, who developed acute renal injury following treatment with valacyclovir hydrochloride, is described. Kidney biopsy, light microscopy and laboratory examination were performed, and all findings revealed the signs of evident vacuolar degeneration of capillary endothelial and renal tubular epithelial cells, erythrocyte aggregation in partial renal tubule and microvilli exfoliation from epithelial cells...
December 2016: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28100371/-changes-in-genotype-prevalence-of-human-papillomavirus-over-10-year-follow-up-of-a-cervical-cancer-screening-cohort
#3
L Dong, S Y Hu, Q Zhang, R M Feng, L Zhang, X L Zhao, J F Ma, S D Shi, X Zhang, Q J Pan, W H Zhang, Y L Qiao, F H Zhao
Objective: To evaluate the dynamic variation of genotypes distribution of human papillomavirus (HPV) over 10-year follow-up in a cervical cancer screening cohort. Methods: Based on the Shanxi Province Cervical Cancer Screening Study Ⅰ cohort, we detected HPV genotypes on the well-preserved exfoliated cervical cells from women who were tested HPV positive from year 2005 to year 2014 using reverse linear probe hybridization assay. The changes of prevalence of type-specific HPV over time among the overall population were estimated using linear mixed models...
January 10, 2017: Zhonghua Liu Xing Bing Xue za Zhi, Zhonghua Liuxingbingxue Zazhi
https://www.readbyqxmd.com/read/28099026/unimer-assisted-exfoliation-for-high-concentrated-aqueous-dispersion-solutions-of-single-and-few-layered-van-der-waals-materials
#4
Changbong Yeon, Inyeal Lee, Gil-Ho Kim, Sun Jin Yun
We suggest unimer-assisted exfoliation method for the exfoliation of Van der Waals two-dimensional (2D) materials such as graphene, MoS2, and h-BN, and show that the micellar size is a critical parameter for enhancing the exfoliation efficiency. To explain the effectiveness of the unimers on the exfoliation, the influence of micellar size of a biocompatible block copolymer, Pluronic F-68, is evaluated in view of the yield and thickness of exfoliated 2D flakes. By the addition of water-soluble alcohols, the surfactants exist in the form of unimer, which facilitates the intercalation into the layered materials and their exfoliation...
January 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28098300/exploration-of-new-ferromagnetic-semiconducting-and-biocompatible-nb3x8-x-cl-br-or-i-monolayers-with-considerable-visible-and-infrared-light-absorption
#5
Junke Jiang, Qiuhua Liang, Ruishen Meng, Qun Yang, Chunjian Tan, Xiang Sun, Xianping Chen
Ferromagnetic character and biocompatible properties have become key factors for developing next-generation spintronic devices and show potential in biomedical applications. Unfortunately, the Mn-containing monolayer is not biocompatible though it has been extensively studied, and the Cr-containing monolayer is not environmental friendly, although these monolayers are ferromagnetic. Herein, we systematically investigated new types of 2D ferromagnetic monolayers Nb3X8 (X = Cl, Br or I) by means of first principles calculations together with mean field approximation based on the classical Heisenberg model...
January 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28095529/open-label-study-evaluating-the-anti-aging-effects-of-a-3-product-2-step-retinol-rejuvenation-system-following-3-months-of-treatment-in-subjects-with-photodamage
#6
Suzanne Bruce, Sylvia Barkovic
BACKGROUND: Photodamage to the skin occurs with exposure to sunlight (UVA or UVB) either intentionally or unintentionally, and can present in a variety of ways. It typically occurs on areas of chronic UV exposure, including the face, ears, and neck. METHODS: We evaluated the effects of a 3-product, 2-step retinol-rejuvenation system containing an exfoliating cleanser, a 0.5% retinol emollient cream, and SPF 30 moisturizing sunscreen used daily for 3 months on the appearance of mild-to-moderate facial photodamage in female subjects...
January 1, 2017: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/28094828/highly-sensitive-and-fast-monolayer-ws2-phototransistors-realized-by-sns-nanosheet-decoration
#7
Zhiyan Jia, Songlin Li, Jianyong Xiang, Fusheng Wen, Xuan Bao, Shanghuai Feng, Ruilong Yang, Zhongyuan Liu
Two-dimensional chalcogenide monolayers are strong candidates for next-generation flexible and transparent optoelectronics. Due to the intrinsic ultrathin thickness and limited optical absorption, however, their responsivity is normally low. Here we develop a simple and low-cost method to fabricate high-performance hybrid phototransistors of monolayer WS2 with significantly enhanced responsivity and an extended spectral response range, by virtue of surface decoration with liquid-phase exfoliated SnS nanosheets (NSs)...
January 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/28094493/a-facile-and-scalable-synthesis-method-for-high-quality-few-layer-graphene-through-solution-based-exfoliation-of-graphite
#8
Boon-Hong Wee, Jong-Dal Hong, Tongfei Wu
Here we describe a facile and scalable method for preparing defect-free graphene sheets exfoliated from graphite using the positively charged polyelectrolyte precursor poly(p-phenylene vinylene) (PPV-pre) as a stabilizer in an aqueous solution. The graphene exfoliated by PPV-pre was apparently stabilized in the solution as a form of graphene/PPV-pre (denoted to GPPV-pre), which remains in a homogenous dispersion over a year. The thickness values of 300 selected 76% GPPV-pre flakes ranged from 1 to 10 nm, corresponding to between one and a few layers of graphene in the lateral dimensions of 1 to 2 μm...
January 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28092438/biofunctionalization-of-nerve-interface-via-biocompatible-polymer-roughened-pt-black-on-cuff-electrode-for-chronic-recording
#9
Yi Jae Lee, Han-Jun Kim, Ji Yoon Kang, Sun Hee Do, Soo Hyun Lee
Peripheral nerve cuff electrodes with roughened Pt black (BPt) are coated with polyethylene glycol (PEG) and Nafion (NF). Although the influence of coated PEG and Nafion on roughened BPt on the electrical properties is weak, the cuff electrode with BPt/PEG and BPt/Nafion exhibits some very important properties. For example, it markedly decreases interfacial impedance, increases charge storage capacity (CSC) due to retaining the BPt surface structure, good stability without exfoliation in repetitive cyclic voltammetry scanning because it is protected by PEG or Nafion coating...
January 16, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28091428/refractive-aim-and-visual-outcome-after-phacoemulsification-a-2-year-review-from-a-tertiary-private-eye-hospital-in-sub-saharan-africa
#10
O Oderinlo, A O Hassan, F O Oluyadi, A O Ogunro, O N Okonkwo, M O Ulaikere, O Ashano
AIM: To review the short-term visual outcome of phacoemulsification in adults with uncomplicated cataracts in Eye Foundation Hospital, Lagos, Nigeria. MATERIALS AND METHODS: A retrospective review of records of patients that had phacoemulsification between January 2012 and December 2013 in Eye Foundation Hospital, Lagos, Nigeria, was done. Preoperative visual acuity, refractive aim, intraoperative complications, postoperative unaided, and best-corrected visual acuity at 1 and 3 months were analyzed...
February 2017: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/28090610/highly-dispersible-edge-selectively-oxidized-graphene-with-improved-electrical-performance
#11
Jisoo Park, Yern Seung Kim, Sae Jin Sung, Taehoon Kim, Chong Rae Park
We prepared liquid phase exfoliated edge-selectively oxidized graphene (LPEOG) with a high concentration in water (∼14.7 mg ml(-1)) and a high ratio of a single layer (70%). The edge of graphite was selectively oxidized by step II oxidation of the modified Hummers method, and we subsequently exfoliated the edge-selectively oxidized graphite (EOG) into LPEOG. The edge selective oxidation of the LPEOG was confirmed by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), zeta-potentiometry, Raman spectroscopy, Fourier-transform infrared spectroscopy (FT-IR), atomic force microscopy (AFM), and transmission electron microscopy (TEM)...
January 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/28088854/conjugated-covalent-organic-frameworks-via-michael-addition%C3%A2-elimination
#12
Malakalapalli Rajeswara Rao, Yuan Fang, Steven De Feyter, Dmitrii F Perepichka
Dynamic covalent chemistry enables self-assembly of reactive building blocks into structurally complex yet robust materials, such as Covalent Organic Frameworks (COFs). However, the synthetic toolbox used to prepare such materials, and thus the spectrum of attainable properties, is very limited. For π-conjugated COFs, the Schiff base condensation of aldehydes and amines is the only general dynamic reaction, but the resulting imine-linked COFs display only a moderate electron delocalization and are susceptible to hydrolysis, particularly in acidic conditions...
January 14, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28087880/direct-synthesis-of-highly-designable-hybrid-metal-hydroxide-nanosheets-using-tripodal-ligands-as-one-size-fits-all-modifiers
#13
Yoshiyuki Kuroda, Tatsuyuki Koichi, Keisuke Muramatsu, Kazuya Yamaguchi, Noritaka Mizuno, Atsushi Shimojima, Hiroaki Wada, Kazuyuki Kuroda
Brucite-type layered metal hydroxides are prepared from diverse metallic elements and have outstanding functions; however, their poor intercalation ability significantly limits their chemical designability and the use of their potentially ultrahigh surface areas and unique properties as two-dimensional nanosheets. Here, we demonstrate that tripodal ligands (R-C(CH2OH)3, R = NH2, CH2OH, or NHC2H4SO3H) are useful as "one-size-fits-all" modifiers for the direct synthesis of hybrid metal hydroxide nanosheets with various constituent metallic elements (M = Mg, Mn, Fe, Co, Ni, or Cu) and surface functional groups...
January 14, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28078607/structure-and-optical-features-of-micro-nanosized-carbon-forms-prepared-by-electrochemical-exfoliation
#14
Sergii G Nedilko, Sergiy Revo, Vitalii Chornii, Vasyl Scherbatskyi, Kateryna Ivanenko, Maksym Nedielko, Yurii Sementsov, Mykola Skoryk, Andrii Nikolenko, Victor Strelchuk
Micro/nanosized carbon materials were prepared by electrochemical exfoliation method in the forms of the colloids and thin films. Scanning electronic microscopy, optical and luminescent microscopy, and Raman scattering and luminescent spectroscopy were applied for characterization of materials. The wide photoluminescence band in the visible spectral region was observed for each of the samples. The shape of the photoluminescence band depends on excitation wavelength and on the size of the particles. At least two components with maxima at ~580 and ~710 nm can be distinguished in the photoluminescence spectra...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28076902/decellularized-extracellular-matrix-of-human-umbilical-vein-endothelial-cells-promotes-endothelial-differentiation-of-stem-cells-from-exfoliated-deciduous-teeth
#15
Ting Gong, Boon Chin Heng, Jianguang Xu, Shaoyue Zhu, Changyong Yuan, Edward Chin Man Lo, Chengfei Zhang
Dental stem cells can serve as a potential source of functional endothelial cells (ECs) for tissue engineering applications, but the endothelial-lineage differentiation efficiency is rather low even with growth factors and mechanical stimuli, which greatly limits their clinical applications. This is partly due to the deficiency of standard two-dimensional (2-D) culture systems, which is unable to recapitulate the three-dimensional (3-D) in vivo milieu that is rich in extracellular matrix. Hence we extracted decellularized extracellular matrix from human umbilical vein endothelial cells (HUVECs-DECM) to provide a bioactive substratum conducive to the endothelial differentiation of dental stem cells...
January 11, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28075485/culturing-and-neuronal-differentiation-of-human-dental-pulp-stem-cells
#16
Sarita Goorha, Lawrence T Reiter
A major issue in studying human neurogenetic disorders, especially rare syndromes affecting the nervous system, is the ability to grow neuronal cultures that accurately represent these disorders for analysis. Although there has been some success in generating induced pluripotent stem (iPS) cells from both skin and blood, there are still limitations to the collection and production of iPS cells from these biospecimens. We have had significant success in collecting and growing human dental pulp stem (DPS) cells from exfoliated teeth sent to our laboratory by the parents of children with a variety of rare neurogenetic syndromes...
January 11, 2017: Current Protocols in Human Genetics
https://www.readbyqxmd.com/read/28074339/factors-associated-with-dental-anxiety-in-brazilian-children-during-the-first-transitional-period-of-the-mixed-dentition
#17
K A Barreto, L D K T Dos Prazeres, D S M Lima, F C Soares, R M M P Redivivo, C da Franca, V Colares
AIMS: To determine the prevalence of dental anxiety in children during the first transitional period of the mixed dentition and associated factors. METHODS: A Cross-sectional study was performed with 1367 children of both genders aged 6-7 years old conducted in schools in Recife, Brazil in 2013. The data were collected through interviews and intra-oral examinations. Dental anxiety data were obtained using the dental anxiety questionnaire (DAQ). The associated factors considered were: age, gender, social group, child's experience with the dentist, history of dental pain, experience of caries and phase of exfoliation...
January 10, 2017: European Archives of Paediatric Dentistry: Official Journal of the European Academy of Paediatric Dentistry
https://www.readbyqxmd.com/read/28073278/wear-resistance-limited-by-step-edge-failure-the-rise-and-fall-of-graphene-as-an-atomically-thin-lubricating-material
#18
Yizhou Qi, Jun Liu, Ji Zhang, Yalin Dong, Qunyang Li
Owing to its intrinsically lubricious property, graphene has a high potential to be an atomically thin solid lubricant for sliding interfaces. Despite its ultrahigh breaking strength at the nanoscale, graphene often fails to maintain its integrity when subjected to macroscale tribological tests. To reveal the true wear characteristics of graphene, a nanoscale diamond tip was used to scratch monolayer graphene mechanically exfoliated to SiO2 substrates. Our experimental results show that while graphene exhibited extraordinary wear resistance in the interior region, it could be easily damaged at the step edge under a much lower normal load (∼2 orders of magnitude smaller)...
January 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28071919/characterize-the-intrinsic-water-wettability-of-graphite-with-contact-angle-measurement-effect-of-defects-on-the-static-and-dynamic-contact-angles
#19
Andrew Kozbial, Charles Trouba, Haitao Liu, Lei Li
Elucidating the intrinsic water wettability of graphitic surface has increasingly attracted research interests triggered by the recent finding that the well-established hydrophobicity of graphitic surfaces actually results from airborne hydrocarbon contamination. Currently, static water contact angle has been often utilized to characterize the intrinsic water wettability of graphitic surfaces. In the current paper, we showed that, due to the existence of defects, static water contact angle does not necessarily characterize the intrinsic water wettability...
January 10, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28071898/abnormal-multiple-charge-memory-states-in-exfoliated-few-layer-wse2-transistors
#20
Mikai Chen, Yifan Wang, Nathan Shepherd, Chad Huard, Jiantao Zhou, L J Guo, Wei Lu, Xiaogan Liang
To construct reliable nanoelectronic devices based on emerging 2D layered semiconductors, we need to understand the charge-trapping processes in such devices. Additionally, the identified charge-trapping schemes in such layered materials could be further exploited to make multibit (or highly desirable analog-tunable) memory devices. Here, we present a study on the abnormal charge-trapping or memory characteristics of few-layer WSe2 transistors. This work shows that multiple charge-trapping states with large extrema spacing, long retention time, and analog tunability can be excited in the transistors made from mechanically exfoliated few-layer WSe2 flakes, whereas they cannot be generated in widely studied few-layer MoS2 transistors...
January 12, 2017: ACS Nano
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