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Exfoliation

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https://www.readbyqxmd.com/read/28221760/hydrogel-nanocomposites-with-independently-tunable-rheology-and-mechanics
#1
Shimon Unterman, Lyndon F Charles, Sara E Strecker, Denis Kramarenko, Dmitry Pivovarchik, Elazer Reuven Edelman, Natalie Artzi
Hydrogels are an attractive class of biomaterials for minimally invasive local drug delivery given their injectability, tunability, high water content, and biocompatibility. Broad applicability though is challenged: relatively modest mechanical properties restricts use to soft tissues, while flow properties necessary for injectability limit implantation to dried, enclosed tissues to minimize material migration during gelation. To address these dual concerns we designed an injectable nanocomposite hydrogel based on dextran aldehyde and poly(amido amine) dendrimer doped with phyllosilicate nanoplatelet fillers...
February 21, 2017: ACS Nano
https://www.readbyqxmd.com/read/28220992/two-dimensional-semiconductors-grown-by-chemical-vapor-transport
#2
Dake Hu, Guanchen Xu, Lei Xing, Xingxu Yan, Jingyi Wang, Jingying Zheng, Zhixing Lu, Peng Wang, Xiaoqing Pan, Liying Jiao
Developing controlled approaches for synthesizing high-quality two-dimensional (2D) semiconductors is essential for their practical applications in novel electronics. The application of chemical vapor transport (CVT), an old single-crystal growth technique, has been extended from growing 3D crystals to synthesizing 2D atomic layers by tuning the growth kinetics. Both single crystalline individual flakes and continuous films of 1 L MoS2 were successfully obtained with CVT approach at low growth temperatures of 300-600 °C...
February 21, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28220763/exfoliation-of-black-phosphorus-in-ionic-liquids
#3
Miyeon Lee, Arup Kumer Roy, Seongho Jo, Yujin Choi, Ari Chae, Bongsoo Kim, Sung Yong Park, Insik In
We report the characterization and formation of sonication-assisted liquid phase exfoliation of bulk black phosphorus (BP) crystals with the incorporation of two representative ionic liquids (ILs) ([Emim][Tf2N] and [Bmim][Tf2N]) as green dispersing media was attempted, which resulted in stable dispersion of multi-layer BP flakes with unsuspected high oxidation resistance and chemical/structural integrity due to the presence of IL layer on top of BP flakes. There are two unveiled issues for the generation of BP dispersion in ILs...
February 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28220757/photoexfoliation-of-two-dimensional-materials-through-continuous-uv-irradiation
#4
Wai-Chen Lin, Ming-Kai Chuang, Muchamed L Keshtov, Ganesh D Sharma, Fang-Chung Chen
This paper describes the preparation of fluorinated graphene nanosheets (FGNs) through photoexfoliation of fluorinated graphite (FG) in the liquid phase. We discovered that UV irradiation of FG dispersions in N-methyl-2-pyrolidone facilitated exfoliation to give FGNs. Transmission electron microscopy and atomic force microscopy revealed that the average thickness of the FGNs was approximately 3 nm; they were considerably thinner than the nanosheets prepared using a conventional sonication approach. Furthermore, when the FGNs were deposited uniformly onto substrates (through spin coating), they formed effective cathode interlayers for polymer solar cells (PSCs), the efficiency of which was 60% greater than that of PSCs containing FGNs prepared through ultrasonication...
February 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28219143/-influence-of-collagen-fibroin-scaffolds-containing-silver-nanoparticles-on-dermal-regeneration-of-full-thickness-skin-defect-wound-in-rat
#5
Z G You, L P Zhang, X G Wang, H L Zhou, S X Guo, P Wu, C M Han
Objective: To explore the influence of collagen/fibroin scaffolds containing silver nanoparticles on dermal regeneration of full-thickness skin defect wound in rat. Methods: Eighty-one collagen/fibroin scaffolds containing silver nanoparticles (with the mass concentration of silver nanoparticles as 10 mg/L) and 81 collagen/fibroin scaffolds without silver nanoparticles were produced respectively with freeze-drying method and enrolled as silver nanoparticles scaffold group (SNS) and control scaffold group (CS)...
February 20, 2017: Zhonghua Shao Shang za Zhi, Zhonghua Shaoshang Zazhi, Chinese Journal of Burns
https://www.readbyqxmd.com/read/28211670/facile-synthesis-of-unique-hexagonal-nanoplates-of-zn-co-hydroxy-sulfate-for-efficient-electrocatalytic-oxygen-evolution-reaction
#6
Soumen Dutta, Chaiti Ray, Yuichi Negishi, Tarasankar Pal
Cost-effective, highly active water oxidation catalysts are becoming increasingly demanding in the field of energy conversion and storage. Herein, simple modified hydrothermally (MHT) synthesized zinc and cobalt based hydroxyl double salt i.e., Zn4-xCoxSO4(OH)6• 0.5 H2O (ZCS) has been exfoliated for the first time as an efficient electrocatalyst for oxygen evolution reaction (OER) in alkaline medium. Morphology investigation suggests the evolution of unique hexagonal nanoplates of ZCS material. As OER catalyst, it requires only 370 and 450 mV overpotential to achieve 10 and 100 mA cm-2 current density respectively...
February 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28211471/phosphorene-quantum-dot-saturable-absorbers-for-ultrafast-fiber-lasers
#7
J Du, M Zhang, Z Guo, J Chen, X Zhu, G Hu, P Peng, Z Zheng, H Zhang
We fabricate ultrasmall phosphorene quantum dots (PQDs) with an average size of 2.6 ± 0.9 nm using a liquid exfoliation method involving ultrasound probe sonication followed by bath sonication. By coupling the as-prepared PQDs with microfiber evanescent light field, the PQD-based saturable absorber (SA) device exhibits ultrafast nonlinear saturable absorption property, with an optical modulation depth of 8.1% at the telecommunication band. With the integration of the all-fiber PQD-based SA, a continuous-wave passively mode-locked erbium-doped (Er-doped) laser cavity delivers stable, self-starting pulses with a pulse duration of 0...
February 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28210452/ewing-sarcoma-of-the-oral-cavity-a-review
#8
REVIEW
Maria Margaix-Muñoz, José Bagán, Rafael Poveda-Roda
OBJECTIVES: A review is made of the clinical, diagnostic, therapeutic and survival characteristics of Ewing sarcoma (ES) of the oral cavity. MATERIAL AND METHODS: A systematic literature search was carried out, with restrictions referred to time (1960-2014), language (English and Spanish) and type of study (case reports, letters, datasets, reviews). The following MeSH terms and boolean operators were used: Ewing AND Sarcoma AND [tongue, jaw, maxilla, cheek, condyle OR temporomandibular, floor AND mouth, gum OR gingiva, palate OR palatal, lip, uvula, head AND neck]...
February 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28210389/the-use-of-lipohydroxy-acid-in-skin-care-and-acne-treatment
#9
REVIEW
Joshua A Zeichner
Lipohydroxy acid is a derivative of salicylic acid with unique properties that explain its clinical effects in the skin. Lipohydroxy acid has skin renewing, exfoliating, and acne treating properties and is a commonly used ingredient in personal skin care products. The slow penetration of lipohydroxy acid results in an individual cell-by-cell exfoliation that is associated with excellent tolerability. Lipohydroxy acid has been shown to induce dermal thickening by stimulating glycosaminoglycans, collagen, and elastin production...
November 2016: Journal of Clinical and Aesthetic Dermatology
https://www.readbyqxmd.com/read/28208984/aquaporin-3-and-e-cadherin-expression-in-perilesional-vitiligo-skin
#10
Ola Ahmed Bakry, Magda Mostafa Hagag, Mona Abd El Halim Kandil, Wafaa Ahmed Shehata
INTRODUCTION: Vitiligo is a common dermatologic disorder with debated aetiology. Most studies focused on role of melanocytes and few investigated the role of keratinocytes in pathogenesis of the disease. AIM: To investigate the keratinocyte adhesion in perilesional vitiligo skin through the immunolocalization of Aquaporin-3 (AQP3) and E-cadherin. SETTING AND DESIGN: Sixty five subjects were selected. These included 40 cases with vitiligo and 25 age and gender-matched healthy subjects as a control group...
December 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28203363/an-exploratory-factor-analysis-of-the-spontaneous-reporting-of-severe-cutaneous-adverse-reactions
#11
Manfred Hauben, Eric Hung, Wen-Yaw Hsieh
BACKGROUND: Severe cutaneous adverse reactions (SCARs) are prominent in pharmacovigilance (PhV). They have some commonalities such as nonimmediate nature and T-cell mediation and rare overlap syndromes have been documented, most commonly involving acute generalized exanthematous pustulosis (AGEP) and drug rash with eosinophilia and systemic symptoms (DRESS), and DRESS and toxic epidermal necrolysis (TEN). However, they display diverse clinical phenotypes and variations in specific T-cell immune response profiles, plus some specific genotype-phenotype associations...
January 2017: Therapeutic Advances in Drug Safety
https://www.readbyqxmd.com/read/28199123/free-standing-single-molecule-thick-crystals-consisting-of-linear-long-chain-polymers
#12
Renwei Liu, Suna Fan, Dongdong Xiao, Jin Zhang, Mengzhou Liao, Shansheng Yu, Fanling Meng, Baoli Liu, Lin Gu, Sheng Meng, Guangyu Zhang, Weitao Zheng, Shuxin Hu, Ming Li
Organic two-dimensional (2D) crystals are fundamentally important for development of future devices. Despite that more than a half of man-made products contain polymers, 2D crystals consisting of long linear chains have yet to be explored. Here we report on the fabrication of 2D polyaniline (PANI) crystals via rational electrochemical polymerization followed by liquid-phase exfoliation. The 2D PANI is molecularly thin (~0.8 nm) and composed of PANI chains with a number-average molecular weight of ~31000. The chains are parallel to each other with the benzene rings standing almost vertically to the surface, implying a face-to-face arrangement of the neighboring chains held together by abundant pi-pi interactions augmented with hydrogen bonds...
February 15, 2017: Nano Letters
https://www.readbyqxmd.com/read/28198978/high-prevalence-of-human-papillomavirus-hpv-in-oral-mucosal-lesions-of-patients-at-the-ambulatory-of-oral-diagnosis-of-the-federal-university-of-sergipe-northeastern-brazil
#13
Mariana Goveia Melo Ribeiro, Larissa Doddi Marcolino, Bruna Ribeiro de Andrade Ramos, Elaine Alves Miranda, Cleverson Luciano Trento, Sona Jain, Ricardo Queiroz Gurgel, Márcia Guimarães da Silva, Silvio Santana Dolabella
Objective: The aim of this study was to evaluate the frequency of HPV infection and its genotypes in patients with oral lesions at the Ambulatory of Oral Diagnosis of the Federal University of Sergipe, Brazil. Material and Methods: We conducted a molecular study with 21 patients (15 females) aged from two to 83 years with clinically detectable oral lesions. Samples were collected through exfoliation of lesions and HPV-DNA was identified using MY09/11 and GP5+/6+ primers...
January 2017: Journal of Applied Oral Science: Revista FOB
https://www.readbyqxmd.com/read/28194037/franckeite-as-a-naturally-occurring-van-der-waals-heterostructure
#14
Aday J Molina-Mendoza, Emerson Giovanelli, Wendel S Paz, Miguel Angel Niño, Joshua O Island, Charalambos Evangeli, Lucía Aballe, Michael Foerster, Herre S J van der Zant, Gabino Rubio-Bollinger, Nicolás Agraït, J J Palacios, Emilio M Pérez, Andres Castellanos-Gomez
The fabrication of van der Waals heterostructures, artificial materials assembled by individual stacking of 2D layers, is among the most promising directions in 2D materials research. Until now, the most widespread approach to stack 2D layers relies on deterministic placement methods, which are cumbersome and tend to suffer from poor control over the lattice orientations and the presence of unwanted interlayer adsorbates. Here, we present a different approach to fabricate ultrathin heterostructures by exfoliation of bulk franckeite which is a naturally occurring and air stable van der Waals heterostructure (composed of alternating SnS2-like and PbS-like layers stacked on top of each other)...
February 13, 2017: Nature Communications
https://www.readbyqxmd.com/read/28194026/exfoliation-of-natural-van-der-waals-heterostructures-to-a-single-unit-cell-thickness
#15
Matěj Velický, Peter S Toth, Alexander M Rakowski, Aidan P Rooney, Aleksey Kozikov, Colin R Woods, Artem Mishchenko, Laura Fumagalli, Jun Yin, Viktor Zólyomi, Thanasis Georgiou, Sarah J Haigh, Kostya S Novoselov, Robert A W Dryfe
Weak interlayer interactions in van der Waals crystals facilitate their mechanical exfoliation to monolayer and few-layer two-dimensional materials, which often exhibit striking physical phenomena absent in their bulk form. Here we utilize mechanical exfoliation to produce a two-dimensional form of a mineral franckeite and show that the phase segregation of chemical species into discrete layers at the sub-nanometre scale facilitates franckeite's layered structure and basal cleavage down to a single unit cell thickness...
February 13, 2017: Nature Communications
https://www.readbyqxmd.com/read/28193625/deep-sequencing-of-urinary-rnas-for-bladder-cancer-molecular-diagnostics
#16
Mandy L Y Sin, Kathleen E Mach, Rahul Sinha, Fan Wu, Dharati Trivedi, Emanuela Altobelli, Kristin C Jensen, Debashis Sahoo, Ying Lu, Joseph C Liao
PURPOSE: The majority of bladder cancer patients present with localized disease and are managed by transurethral resection. However, the high rate of recurrence necessitates lifetime cystoscopic surveillance. Developing a sensitive and specific urine-based test would significantly improve bladder cancer screening, detection, and surveillance. EXPERIMENTAL DESIGN: RNA-seq was used for biomarker discovery to directly assess the gene expression profile of exfoliated urothelial cells in urine derived from bladder cancer patients (n=13) and controls (n=10)...
February 13, 2017: Clinical Cancer Research: An Official Journal of the American Association for Cancer Research
https://www.readbyqxmd.com/read/28193031/mose2-nanolabels-for-electrochemical-immunoassays
#17
Rou Jun Toh, Carmen C Mayorga-Martinez, Zdeněk Sofer, Martin Pumera
There is huge interest in biosensors as a result of the demand for personalized medicine. In biomolecular detection, transition-metal dichalcogenides (TMDs) can be used as signal-enhancing elements. Herein, we utilize a solution-based electrochemical exfoliation technique with bipolar electrodes to manufacture MoSe2 nanolabels for biomolecular detection. Prepared MoSe2 nanoparticles (NPs) exhibit electrocatalytic activity toward the hydrogen evolution reaction (HER), and such a property allows it to act as a robust label for magneto-immunoassays toward protein detection...
December 20, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/28186847/cytogenetic-biomonitoring-in-individuals-exposed-to-cone-beam-ct%C3%AF-comparison-among-exfoliated-buccal-mucosa-cells%C3%AF-cells-of-tongue-and-epithelial-gingival-cells
#18
Pan Yang, Shuai Hao, Xu Gong, Gang Li
OBJECTIVES: To evaluate chromosomal damage and cytotoxicity in exfoliated buccal mucosa cells,cells of tongue and epithelial gingival cells from adults following cone beam CT scan, and to compare the sensitivity of the different exfoliated cells to a same dosage of ionizing radiation. METHODS: The study included 46 healthy participants (median age 27 years; age range 23-42 years) who had a cone beam CT scan. Exfoliated mucosa cells were collected immediately before the CBCT scan and 10 days after...
February 10, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28183613/pdlla-honeycomb-like-scaffolds-with-a-high-loading-of-superhydrophilic-graphene-multi-walled-carbon-nanotubes-promote-osteoblast-in-vitro-functions-and-guided-in-vivo-bone-regeneration
#19
Edmundo Silva, Luana Marotta Reis de Vasconcellos, Bruno V M Rodrigues, Danilo Martins Dos Santos, Sergio P Campana-Filho, Fernanda Roberta Marciano, Thomas J Webster, Anderson Oliveira Lobo
Herein, we developed honeycomb-like scaffolds by combining poly (d, l-lactic acid) (PDLLA) with a high amount of graphene/multi-walled carbon nanotube oxides (MWCNTO-GO, 50% w/w). From pristine multi-walled carbon nanotubes (MWCNT) powders, we produced MWCNTO-GO via oxygen plasma etching (OPE), which promoted their exfoliation and oxidation. Initially, we evaluated PDLLA and PDLLA/MWCNTO-GO scaffolds for tensile strength tests, cell adhesion and cell viability (with osteoblast-like MG-63 cells), alkaline phosphatase (ALP, a marker of osteoblast differentiation) activity and mineralized nodule formation...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28182956/alkali-assisted-mild-aqueous-exfoliation-for-single-layered-and-structure-preserved-graphitic-carbon-nitride-nanosheets
#20
Gengnan Li, Liang Li, Haiyang Yuan, Haifeng Wang, Huarong Zeng, Jianlin Shi
Single-layered g-C3N4 nanosheets have been fabricated by delaminating directly its bulk counterpart in an alkaline solution. According to the theoretical modeling, the interaction of OH(-) with terminal NH2 or bridged NH group of the triazine units within bulk g-C3N4 crystal structure could result in decreased bonding energy between layers and promote the total delamination. The resulting g-C3N4 nanosheets colloid has a relatively high concentration (12g/L) compared with the traditional ultrasonic assistant exfoliation method...
February 1, 2017: Journal of Colloid and Interface Science
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