keyword
MENU ▼
Read by QxMD icon Read
search

Exfoliation

keyword
https://www.readbyqxmd.com/read/28432703/selective-calixarene-directed-synthesis-of-mxene-plates-crumpled-sheets-spheres-and-scrolls
#1
Arni Vaughn, Jeremy Ball, Tobias Heil, David Morgan, Giulio Lampronti, Gabija Maršalkaitė, Colin L Raston, Nicholas P Power, Suela Kellici
Fully exploiting the electronic and mechanical properties of 2D laminar materials not only requires efficient and effective means of their exfoliation into low dimensional layers, but also necessitates a means of changing their morphology so as to explore any enhancement that this may offer. MXenes are a rapidly emerging new class of such laminar materials with unique properties. However, access to other morphologies of MXenes has not yet been fully realised. To this end we have developed the synthesis of MXenes (Ti2C) as plates, crumpled sheets, spheres and scrolls, which involves selective intercalation of p-phosphonic calix[n]arenes, with control in morphology arising from the choice of the size of the macrocycle, n = 4, 5, 6 or 8...
April 21, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28430636/exploring-the-role-of-paraoxonase-2-in-bladder-cancer-analyses-performed-on-tissue-samples-urines-and-cell-cultures
#2
Tiziana Bacchetti, Davide Sartini, Valentina Pozzi, Tiziana Cacciamani, Gianna Ferretti, Monica Emanuelli
The enzyme paraoxonase-2 (PON2) is ubiquitously expressed and exerts its antiapoptotic and antioxidative functions in several intracellular compartments.The aim of this study is to investigate the role of PON2 in bladder cancer (BC). The expression levels of PON2 in paired tumor and normal bladder tissue samples and in urinary exfoliated cells from patients affected with BC and healthy donors were evaluated. Moreover, the effect of PON2 overexpression on tumor cell proliferation and susceptibility to oxidative stress was investigated in human bladder cancer cell line T24...
February 24, 2017: Oncotarget
https://www.readbyqxmd.com/read/28429388/layered-double-hydroxide-nanosheets-with-multiple-vacancies-obtained-by-dry-exfoliation-as-highly-efficient-oxygen-evolution-electrocatalysts
#3
Yanyong Wang, Yiqiong Zhang, Zhijuan Liu, Chao Xie, Shi Feng, Dongdong Liu, Mingfei Shao, Shuangyin Wang
Layered double hydroxides (LDHs) with two-dimensional lamellar structures show excellent electrocatalytic properties. However, the catalytic activity of LDHs needs to be further improved as the large lateral size and thickness of the bulk material limit the number of exposed active sites. However, the development of efficient strategies to exfoliate bulk LDHs into stable monolayer LDH nanosheets with more exposed active sites is very challenging. On the other hand, the intrinsic activity of monolayer LDH nanosheets can be tuned by surface engineering...
April 21, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28429029/derivatization-and-interlaminar-debonding-of-graphite-iron-nanoparticle-hybrid-interfaces-using-fenton-chemistry
#4
Neha Agarwal, Ruma Bhattacharyya, Narendra K Tripathi, Sanjay Kanojia, Debmalya Roy, Kingsuk Mukhopadhyay, Namburi Eswara Prasad
The interfacial debonding of graphite lattices using iron (Fe) nanoparticles and Fenton's reagent is reported, towards the scalable production of few-layer graphene flakes. Acoustic cavitation via a sonochemical route was adapted to produce iron and iron oxide nanoparticles in the graphite matrix. The oxygenated species were introduced into the graphite lattice using a physical method, and then Fenton chemistry was utilized to generate localized hydroxyl radicals at the Fe nanoparticle-graphite interfaces for zipping and self-exfoliation of the defected graphite lattices...
April 21, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28429007/tuning-the-electrical-conductivity-of-exfoliated-graphite-nanosheets-nanofluids-by-surface-functionalization
#5
C Hermida-Merino, M Pérez-Rodríguez, M M Piñeiro, M J Pastoriza-Gallego
The electrical conductivity of exfoliated graphite in water nanofluids has been experimentally determined, and compared with the same property when the dispersed nanosheets have been oxidized. The effect of oxidation on this property is different if compared with the case of sintered dry nanosheets. In any case, for the sintered raw material the conduction behaves as expected in a metal, while for the nanofluid it shows values and trends typical of a weak electrolyte solution. The effect of oxidation on the electrical conductivity of exfoliated graphite can be explained as being caused by the dissociation in the fluid phase of the moieties resulting from the chemical functionalization process...
April 21, 2017: Soft Matter
https://www.readbyqxmd.com/read/28427614/production-of-graphene-quantum-dots-by-ultrasound-assisted-exfoliation-in-supercritical-co2-h2o-medium
#6
Hanyang Gao, Chen Xue, Guoxin Hu, Kunxu Zhu
In this research, three kinds of graphene quantum dots (GQDs)-pristine graphene quantum dots (PGQDs), expanded graphene quantum dots (EGQDs) and graphene oxide quantum dots (GOQDs)-were produced from natural graphite, expanded graphite, and oxide graphite respectively in an ultrasound-assisted supercritical CO2 (scCO2)/H2O system. The effects of aqueous solution content ratio, system pressure, and ultrasonic power on the yields of different kinds of GQDs were investigated. According to these experiment results, the combination of the intense knocking force generated from high-pressure acoustic cavitation in a scCO2/H2O system and the superior penetration ability of scCO2 was considered to be the key to the successful exfoliation of such tiny pieces from bulk graphite...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28424749/development-of-asymmetric-facial-depigmentation-in-a-patient-treated-with-dasatinib-with-new-onset-hypovitaminosis-d-case-report-and-review-of-the-literature
#7
Kirsten C Webb, Magdalena Harasimowicz, Monica Janeczek, Jodi Speiser, James Swan, Rebecca Tung
Dasatinib is a second-generation tyrosine kinase inhibitor (TKI) used to treat imatinib-resistant chronic myelogenous leukemia (CML), as well as other Philadelphia chromosome-positive lymphoproliferative disorders. While the most commonly reported cutaneous side effects with this therapy include a morbilliform eruption, skin exfoliation, and skin irritation, pigmentary abnormalities have also been observed, albeit much more rarely. We present the case of a 72-year-old South Asian male with CML who presented with new-onset hypopigmentation of his face and scalp three years after a dose increase of dasatinib therapy, in the setting of newly discovered borderline hypovitaminosis D...
2017: Case Reports in Dermatological Medicine
https://www.readbyqxmd.com/read/28422225/layer-independent-and-layer-dependent-nonlinear-optical-properties-of-two-dimensional-gax-x-s-se-te-nanosheets
#8
Lei Hu, Xuri Huang, Dongshan Wei
Recently researchers have found that the non-resonant second-harmonic generation (SHG) intensity of the GaSe monolayer (ML) is the strongest among all two-dimensional (2D) atomic layered crystals. Here we perform a systematic first-principles study of the SHG coefficient of GaX (X = S, Se, Te) monolayers (MLs) and few-layers. We find that the non-resonant SHG intensity of the GaS ML can be comparable with that of the GaSe ML, while the non-resonant SHG intensity of the GaTe ML is much stronger than that of the GaSe ML...
April 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28420890/endoscopic-manifestations-and-clinical-characteristics-of-cytomegalovirus-infection-in-the-upper-gastrointestinal-tract
#9
Masaya Iwamuro, Eisei Kondo, Takehiro Tanaka, Hideharu Hagiya, Seiji Kawano, Yoshiro Kawahara, Fumio Otsuka, Hiroyuki Okada
We retrospectively analyzed the cases of 14 patients (9 women, 5 men, mean age: 51.6 years) with cytomegalovirus (CMV) involvement in the esophagus, stomach, and/or duodenum diagnosed at a single center, to determine their endoscopic features and clinical backgrounds. Thirteen patients (92.9%) had hematologic disease; the other had rheumatoid arthritis. Of the former, 12 patients underwent allogeneic hematopoietic stem cell transplantation, and 9 of these patients had graft-versus-host disease (GVHD) before undergoing esophagogastroduodenoscopy (EGD)...
April 2017: Acta Medica Okayama
https://www.readbyqxmd.com/read/28418064/surfactant-exfoliated-2d-hexagonal-boron-nitride-2d-hbn-explored-as-a-potential-electrochemical-sensor-for-dopamine-surfactants-significantly-influence-sensor-capabilities
#10
Aamar F Khan, Dale A C Brownson, Christopher W Foster, Graham C Smith, Craig E Banks
Surfactant exfoliated 2D hexagonal Boron Nitride (2D-hBN) nanosheets are explored as a potential electrochemical sensing platform and evaluated towards the electroanalytical sensing of dopamine (DA) in the presence of the common interferents, ascorbic acid (AA) and uric acid (UA). Surfactant exfoliated 2D-hBN nanosheets (2-4 layers) fabricated using sodium cholate in aqueous media are electrically wired via a drop-casting modification process onto disposable screen-printed graphite electrodes (SPEs). We critically evaluate the performance of these 2D-hBN modified SPEs and demonstrate the effect of 'mass coverage' towards the detection of DA, AA and UA...
April 18, 2017: Analyst
https://www.readbyqxmd.com/read/28414950/a-nanobiosensor-composed-of-exfoliated-graphene-oxide-and-gold-nano-urchins-for-detection-of-gmo-products
#11
Zahra Aghili, Navid Nasirizadeh, Adeleh Divsalar, Shahram Shoeibi, Parichehreh Yaghmaei
Genetically Modified Organisms, have been entered our food chain and detection of these organisms in market products are still the main challenge for scientists. Among several developed detection/quantification methods for detection of these organisms, the electrochemical nanobiosensors are the most attended which are combining the advantages of using nanomaterials, electrochemical methods and biosensors. In this research, a novel and sensitive electrochemical nanobiosensor for detection/quantification of these organisms have been developed using nanomaterials; Exfoliated Graphene Oxide and Gold Nano-Urchins for modification of the screen-printed carbon electrode, and also applying a specific DNA probe as well as hematoxylin for electrochemical indicator...
March 6, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28414946/green-synthesis-of-hybrid-graphene-oxide-microcrystalline-cellulose-aerogels-and-their-use-as-superabsorbents
#12
Xiao Wei, Ting Huang, Jing-Hui Yang, Nan Zhang, Yong Wang, Zuo-Wan Zhou
In this work, we developed a green synthesis method to prepare the hybrid aerogels containing graphene oxide (GO) and microcrystalline cellulose (MCC) using lithium bromide (LiBr) aqueous solution as the solvent, which insured the complete dissolution of MCC. The interaction between GO and MCC was investigated through different methods The results demonstrate that there is a strong interaction between GO and MCC molecules, which promotes the exfoliation of GO in the hybrid aerogels. The hybrid GO/MCC aerogels exhibit typical three dimensional porous structure and the pore morphology can be well adjusted by changing the content of GO...
April 9, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28414418/novel-composite-proton-exchange-membrane-with-connected-long-range-ionic-nanochannels-constructed-via-exfoliated-nafion-boron-nitride-nanocomposite
#13
Wei Jia, Beibei Tang, Peiyi Wu
Nafion-boron nitride (NBN) nanocomposites with a Nafion-functionalized periphery are prepared via a convenient and ecofriendly Nafion-assisted water-phase exfoliation method. Nafion and the boron nitride nanosheet present strong interactions in the NBN nanocomposite. Then the NBN nanocomposites were blended with Nafion to prepare NBN Nafion composite proton exchange membranes (PEMs). NBN nanocomposites show good dispersibility and have a noticeable impact on the aggregation structure of the Nafion matrix. Connected long-range ionic nanochannels containing exaggerated (-SO3(-))n ionic clusters are constructed during the membrane-forming process via the hydrophilic and H-bonding interactions between NBN nanocomposites and Nafion matrix...
April 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28414208/highly-compressible-nitrogen-doped-carbon-foam-electrode-with-excellent-rate-capability-via-a-smart-etching-and-catalytic-process
#14
Kang Xiao, Yanhua Zeng, Jin Long, Hongbin Chen, Liangxin Ding, Suqing Wang, Haihui Wang
Freestanding three-dimensional (3D) nitrogen-doped carbon foam (NCF) with large pore architectures is proposed as a promising electrode configuration for elastic electronics. However, although it exhibits excellent mechanical performance, the available capacitive performances (especially its rate capability) are still unsatisfactory. By using KMnO4, we demonstrate a smart etching and catalytic process to form highly graphitized and etched nitrogen-doped carbon foam (denoted as ENCF) with an exfoliated carbon shell architecture...
April 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28412803/-association-analysis-between-loxl1-gene-and-exfoliation-syndrome
#15
L Chen, N L Wang, S S Rong, L N Huang, H B Cheng
Objective: To evaluate the association of LOXL gene and XFS/XFG in Chinese population. Methods: Experimental research. Fifty unrelated patients from shenzhen Eye Hospital and Beijing Tongren Hospital with exfoliation syndrome or exfoliation glaucoma and 100 control subjects were included. All the seven exons and the splicing region were amplified by polymerase chain reaction (PCR) and were directly sequenced. The comparison of allelic frequencies and genotype frequencies between case and control groups was performed using standard χ(2) test...
April 11, 2017: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/28409676/analysis-of-risk-factors-for-persistent-infection-of-asymptomatic-women-with-high-risk-human-papilloma-virus
#16
Nianmin Shi, Qiang Lu, Jiao Zhang, Li Li, Junnan Zhang, Fanglei Zhang, Yanhong Dong, Xinyue Zhang, Zheng Zhang
OBJECTIVE: This study aims to prevent persistent infection, reduce the incidence of cervical cancer, and improve women's health by understanding the theoretical basis of the risk factors for continuous infection of asymptomatic women with high-risk human papilloma virus (HPV) strains via information collected, which includes the persistent infection rate and the most prevalent HPV strain types of high risk to asymptomatic women in the high-risk area of cervical cancer in Linfen, Shanxi Province...
April 14, 2017: Human Vaccines & Immunotherapeutics
https://www.readbyqxmd.com/read/28407302/posttranscriptional-interaction-between-mir-450a-5p-and-mir-28-5p-and-stat1-mrna-triggers-osteoblastic-differentiation-of-human-mesenchymal-stem-cells
#17
Janaína A Dernowsek, Milena C Pereira, Thaís A Fornari, Claudia Macedo, Amanda F Assis, Paula B Donate, Karina F Bombonato-Prado, Maria Rita Passos-Bueno, Geraldo A Passos
We demonstrate that the interaction between miR-450a-5p and miR-28-5p and signal transducer and activator of transcription 1 (STAT1) mRNA correlates with the osteoblastic differentiation of mesenchymal stem cells from human exfoliated deciduous teeth (shed cells). STAT1 negatively regulates runx-related transcription factor 2 (RUNX2), which is an essential transcription factor in this process. However, the elements that trigger osteoblastic differentiation and therefore pause the inhibitory effect of STAT1 need investigation...
April 13, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/28406994/neisseria-gonorrhoeae-infects-the-human-endocervix-by-activating-non-muscle-myosin-ii-mediated-epithelial-exfoliation
#18
Liang-Chun Wang, Qian Yu, Vonetta Edwards, Brian Lin, Jessica Qiu, Jerrold R Turner, Daniel C Stein, Wenxia Song
Colonization and disruption of the epithelium is a major infection mechanism of mucosal pathogens. The epithelium counteracts infection by exfoliating damaged cells while maintaining the mucosal barrier function. The sexually transmitted bacterium Neisseria gonorrhoeae (GC) infects the female reproductive tract primarily from the endocervix, causing gonorrhea. However, the mechanism by which GC overcome the mucosal barrier remains elusive. Using a new human tissue model, we demonstrate that GC can penetrate into the human endocervix by inducing the exfoliation of columnar epithelial cells...
April 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28406150/one-step-assembly-of-2h-1t-mos2-cu-reduced-graphene-oxide-nanosheets-for-highly-efficient-hydrogen-evolution
#19
H-Y He
The transition metal dichagenides and their metallic 1T structure are attracting contemporary attentions for applications in high-performance devices because their peculiar optical and electrical properties. The single and few layers 1T structure is generally obtained by mechanical or chemical exfoliation. This work presents facile one-step synthesis of 2H-1T MoS2:Cu/reduced graphene oxide nanosheets. The experiment results indicated that the MoS2 and MoS2:Cu prepared by simple chemical solution reaction possessed 2H-1T structures...
April 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28404017/dna-testing-of-pancreatic-cyst-fluid-is-it-ready-for-prime-time
#20
REVIEW
Aatur D Singhi, Marina N Nikiforova, Kevin McGrath
Pancreatic cysts are a clinical quandary in both diagnosis and management. Although many cysts, such as pseudocysts and serous cystadenomas, are benign and can be monitored clinically, mucinous cysts, such as intraductal papillary mucinous neoplasms and mucinous cystic neoplasms, have the potential to progress to pancreatic cancer. Considering the poor prognosis of pancreatic cancer, the detection of a pancreatic cyst can be a source of anxiety for both the patient and physician. This diagnosis in turn can lead to expensive, invasive, and even harmful surveillance and treatment options...
January 2017: Lancet. Gastroenterology & Hepatology
keyword
keyword
25606
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"