Free-radical graft polymerization of acrylonitrile on gamma irradiated graphene oxide: Synthesis and characterization

Publication date: Available online 15 February 2020Source: Materials Chemistry and PhysicsAuthor(s): Amara Nasir, Asif Raza, Mehwish Tahir, Tariq YasinAbstractA novel graphene oxide (GO) grafted polyacrylonitrile (PAN) nanohybrid was synthesized via free radical polymerization. An innovative green method has been used to modify the surface of graphene oxide by gamma radiation. GO was gamma irradiated in air at different absorbed doses to enhance the amount of oxidative groups on its surface. The gamma irradiated GO was silanized with vinyltriethoxysilane (VTES) and used as base material to graft acrylonitrile (AN) on its surface. Synthesis parameters were optimized by varying the concentration of monomer, initiator, and surfactant to get maximum grafting of PAN. The percentage of grafting on GO was increased with increase in gamma absorbed dose. Maximum grafting of 850% of PAN was obtained in 100 kGy irradiated GO. Spectroscopic techniques such as FT-IR, Raman and XRD were used to characterize the synthesized nanohybrids. The obtained results confirmed the structural changes during gamma irradiation of GO and successful grafting of PAN onto it. The morphological changes in irradiated GO during silanization and its PAN grafted nanohybrids were studied by field emission scanning electron microscopy (FESEM). Thermal gravimetric analysis (TGA) demonstrated that the thermal stability of GO-g-PAN was decreased with increase in PAN content. The developed nanohybrid can act as a pr...
Source: Materials Chemistry and Physics - Category: Materials Science Source Type: research

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Authors: Rusch R, Greenman J, Scanlon C, Horne K, Jonas DF Abstract Bibliotherapy is a therapeutic intervention that could potentially be utilized by pediatric palliative care social workers to aid in providing individualized support and adaptive coping techniques through end-of-life and bereavement. Multiple modalities of implementing bibliotherapy are considered, including applications in individual and group counseling. An institutionally supported bibliotherapy program that aims to provide therapeutic and recreational texts for patients, families and clinicians is described. Suggested guidelines and book titles...
Source: Journal of Social Work in End-of-Life and Palliative Care - Category: Palliative Care Tags: J Soc Work End Life Palliat Care Source Type: research
Dalton Trans., 2020, Accepted Manuscript DOI: 10.1039/D0DT00437E, PaperLily Lee Lee Li, Mar ía de Guadalupe Jaraquemada-Peláez, Eduardo Aluicio-Sarduy, Xiaozhu Wang, Todd E Barnhart, Weibo Cai, Valery Radchenko, Paul Schaffer, Jonathan W Engle, Chris Orvig Both scandium-44 and yttrium-86 are popular PET isotopes with appropriate half-lives for immuno-positron emission tomography (immuno-PET) imaging. Herein, a new bifunctional H4pypa ligand, H4pypa-phenyl-NCS, is synthesized, conjugated to a monoclonal... The content of this RSS Feed (c) The Royal Society of Chemistry
Source: RSC - Dalton Trans. latest articles - Category: Chemistry Authors: Source Type: research
Authors: Steinmetz RG, Maupin JJ, Johnson EB, Cantrell AJ, Fox JA, Bernhardt JA, Pasque CB, Teague DC Abstract INTRODUCTION: Extra-articular scapula body fractures have been shown to have good outcomes with nonsurgical management. What is not known is whether routine postinjury imaging of these fractures is necessary for monitoring healing and alignment. As the shift toward providing cost-effective healthcare continues, we sought to evaluate if routine postinjury imaging of these fractures resulted in any change in management while secondarily evaluating the imaging for fracture patterns at risk of displacement. ...
Source: The Journal of the American Academy of Orthopaedic Surgeons - Category: Orthopaedics Tags: J Am Acad Orthop Surg Source Type: research
Abstract Background Chronic Venous Disease (CVD) is the main cause of chronic leg ulcers. Varicose veins are the most frequent cause of venous leg ulcers (VLU). 50.9% of Brazilian women have varicose veins and ulcer prevalence is as high as 4%. Ultrasound-guided foam sclerotherapy (UGFS) is a low-cost treatment option for varicose veins. Objectives To analyze UGFS outcomes in patients with VLU. Methods Prospective consecutive single center cohort study. Patients with great saphenous vein (GSV) reflux and VLU were treated and followed-up for 180 days. The following were studied: quality of life (QoL), disease severity, heal...
Source: Jornal Vascular Brasileiro - Category: Surgery Source Type: research
RESUMO As estenoses graves e oclus ões do tronco braquiocefálico (artéria inominada) são raras, e apresentam uma grande variedade de manifestações clínicas, com alterações relacionadas a isquemia cerebral hemisférica, vertebrobasilar e de membro superior direito. A causa mais comum é a aterosclerose. A ultrassonografia vas cular com Doppler pode revelar inversão de fluxo na artéria vertebral direita, hipofluxo na subclávia, e vários tipos de alterações no fluxo da carótida direita, incluindo hipoflu...
Source: Jornal Vascular Brasileiro - Category: Surgery Source Type: research
Conclusions. Although there is an association between malignancy and IE, no treatment strategy has yet been developed for these patients. Short-term outcome of IE is unaltered by cancer. In most papers, the effect of cancer on mid-term survival is only significant in a univariate analysis, without being a predictor. The results indicate that cardiac surgery for IE should not be withheld in patients in whom a treatable malignancy has been found. PMID: 32233824 [PubMed - in process]
Source: Scandinavian Cardiovascular Journal - Category: Cardiology Tags: Scand Cardiovasc J Source Type: research
CONCLUSIONS: Our findings support the protective effect a normal weight against advanced adenomas. Reduction of BMI value should be pursued in healthy programs. PMID: 32233893 [PubMed - as supplied by publisher]
Source: Scandinavian Journal of Gastroenterology - Category: Gastroenterology Tags: Scand J Gastroenterol Source Type: research
Conclusion: There is a slightly increasing trend in the occurrence of esophageal perforations. Contemporary treatment is less invasive with similar results. Patients treated in high-volume hospitals have better prognosis. PMID: 32233883 [PubMed - as supplied by publisher]
Source: Scandinavian Journal of Gastroenterology - Category: Gastroenterology Tags: Scand J Gastroenterol Source Type: research
Conclusion: Abstinence from alcohol following AC/AH diagnosis was achieved in 39% of patients. Abstinence was not related to increased survival for alcoholic liver disease patients at one-year, which might partly indicate that this might be a marker that some patients were 'too sick to drink'. AC and AH patients who survived one year and remained abstinent had a favorable long-term prognosis. PMID: 32233877 [PubMed - as supplied by publisher]
Source: Scandinavian Journal of Gastroenterology - Category: Gastroenterology Tags: Scand J Gastroenterol Source Type: research
Authors: Møller S, Kimer N, Barløse M, Bendtsen F Abstract Detailed knowledge and understanding of the pathophysiological mechanisms and changes in hepatic and splanchnic function leading to the development of haemodynamic changes and portal hypertension in patients with cirrhosis are essential since it guides the search for targets to ameliorate liver-related abnormalities. Recent research has focused on the gut-liver axis, changes in intestinal permeability, translocation of bacterial products, and inflammation as important drivers of haemodynamic alterations and thereby targets for treatment. Addit...
Source: Scandinavian Journal of Gastroenterology - Category: Gastroenterology Tags: Scand J Gastroenterol Source Type: research
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