Effect of tin deposition over electrogenerated random defects on Pt(111) surfaces onto ethanol electrooxidation: Electrochemical and FTIR studies

Publication date: Available online 9 December 2019Source: Journal of Electroanalytical ChemistryAuthor(s): Amaury F.B. Barbosa, Vinicius Del Colle, Nelson A. Galiote, Germano Tremiliosi-FilhoAbstractIn the present study, random superficial defects of the {110}-type were electrogenerated on an initially well-ordered Pt(111) single crystal electrode, by cycling the potential in the range from 0.05 to 1.30 V by 32 times in perchloric acid solution and in a scan rate of 0.05 V s−1, named as Pt(111)-32. After partial disordering of the electrode surface, it was modified by deposition of tin submonolayers in three different coverage degrees of Sn, namely, ѲSnDefects= 0, 0.34, 0.54 and 1.0. The Sn is preferentially deposited on the {110}-type defects generated previously. The effect of tin over the electrocatalytic activity for the ethanol electrooxidation reaction (EOR) and CO oxidation was investigated by using cyclic voltammetry, while the mechanism of the alcohol oxidation on the unmodified and Sn-modified electrodes was investigated by using in situ Fourier Transform Infrared (FTIR) spectroscopy. The lower Sn coverage degree on defect sites (ѲSnDefects= 0.34) showed, in the first voltammetric cycle, very good performance for EOR, having a peak current at 0.58 V twice the one observed for the unmodified Pt(111)-32 electrode. However, the situation changed in the second voltammetric cycle, where on the full Sn covered defect sites electrode (ѲSnDefects= 1) a bett...
Source: Journal of Electroanalytical Chemistry - Category: Chemistry Source Type: research

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Publication date: Available online 24 January 2020Source: Microbial PathogenesisAuthor(s): Mani Divya, Marimuthu Govindarajan, Sivashanmugam Karthikeyan, Elumalai Preetham, Naiyf S. Alharbi, Shine Kadaikunnan, Jamal M. Khaled, Taghreed N. Almanaa, Baskaralingam VaseeharanAbstractβ-Glucan-binding protein (βGBP) is important for the rational expansion of molecular biology. Here, zinc oxide nanoparticle (ZnONP) was synthesized using βGBP from the crab Scylla serrata (Ss-βGBP-ZnONP). Ss-βGBP-ZnONP was observed as a 100 kDa band on sodium dodecyl sulfate polyacrylamide gel and characterized with UV&nd...
Source: Microbial Pathogenesis - Category: Infectious Diseases Source Type: research
Conclusions: In this initial small series, we found that robot-assisted VVF repair is a safe procedure with results comparable to transvaginal repair. This procedure has a high success rate and few complications without using interposed tissue. PMID: 31975648 [PubMed - as supplied by publisher]
Source: Scandinavian Journal of Urology - Category: Urology & Nephrology Tags: Scand J Urol Source Type: research
Publication date: 1 April 2020Source: Materials Chemistry and Physics, Volume 244Author(s): Meiling Ren, Weifang Han, Yufeng Bai, Chunhua Ge, Lili He, Xiangdong ZhangAbstractBoron carbon oxynitride (BCNO) was successfully prepared via the template of the melamine sponge. The resultant BCNO was characterized by infrared spectroscopy, fluorescence spectrophotometer, scanning electron microscope as well as quantum yield (QY). The results revealed that BCNO exhibit yellow-green photoluminescence under UV illumination with QY of 86%. For BCNO phosphor, the fluorescence is disappeared in the water, which limits its application i...
Source: Materials Chemistry and Physics - Category: Materials Science Source Type: research
Publication date: Available online 24 January 2020Source: PolymerAuthor(s): Róbert Várdai, Thomas Lummerstorfer, Claudia Pretschuh, Michael Jerabek, Markus Gahleitner, Gábor Faludi, János Móczó, Béla PukánszkyAbstractTwo polypropylene polymers with considerably differing properties were modified with poly(ethylene terephthalate) (PET) and poly(vinyl alcohol) (PVA) fibers. Fiber content changed from 0 to 60 vol% and interfacial adhesion was modified with the addition of a maleated PP coupling agent. Mechanical properties were characterized by tensile and impact testi...
Source: Polymer - Category: Chemistry Source Type: research
Publication date: June 2020Source: Food Packaging and Shelf Life, Volume 24Author(s): Taíla V. de Oliveira, Pedro Augusto V. de Freitas, Cícero C. Pola, José Osvaldo R. da Silva, Lina Daniela A. Diaz, Sukarno Olavo Ferreira, Nilda de F.F. SoaresAbstractBiodegradable polymers can produce sustainable films to substitute regular food packaging as an answer to environmental concerns and food preservation. Nisin Z (NIS Z) bioactive compound can be embedded into biodegradable polymers, such as polyvinyl alcohol (PVA) and starch, to produce antimicrobial eco-friendly active films. Cellulose nanocrystals (CNC)...
Source: Food Packaging and Shelf Life - Category: Food Science Source Type: research
Publication date: 1 March 2020Source: Journal of Molecular Liquids, Volume 301Author(s): Reena, Abhinav Kumar, Vikas Mahto, Abhay Kumar ChoubeyAbstractPolymer gels have been proved useful for profile control and reducing excess water production from hydrocarbon-bearing reservoirs. In the present work, gels consisting of polyvinyl alcohol (PVA) and polyvinyl pyrrolidone (PVP) and a blend of these two polymers (PVA and PVP) crosslinked with organic crosslinker was developed and studied. The optimum pH and polymer crosslinker ratio for gel systems was between 8 and 9 and the ratio was 1/0.25 respectively. The viscoelastic pro...
Source: Journal of Molecular Liquids - Category: Molecular Biology Source Type: research
AbstractPurposeBrain positron emission tomography using 18F-fluorodeoxyglucose (18FDG-PET) provides a metabolic assessment of brain function that is useful for differential diagnosis among several neurodegenerative diseases manifested by cognitive impairment (CI). The purpose of the study is to describe the pattern of 18FDG-PET abnormalities in patients with CI related to alcohol use disorder.MethodsPatients admitted to the addiction medicine department of a university hospital in Paris between January 2017 and October 2018 with a confirmed diagnosis of alcohol-related cognitive impairment (ARCI) or Wernicke encephalopathy...
Source: European Journal of Nuclear Medicine and Molecular Imaging - Category: Nuclear Medicine Source Type: research
Publication date: Available online 18 January 2020Source: Carbohydrate PolymersAuthor(s): Dimitrios G. Trikkaliotis, Achilleas K. Christoforidis, Athanasios C. Mitropoulos, George Z. KyzasAbstractA novel adsorbent material composed of chitosan (Cs), polyvinyl alcohol (PVA) and polyethylene glycol (PEG) was prepared in hydrogel bead form to efficiently remove copper ions from aqueous solutions. The properties of the composite were characterized by scanning electronic microscopy (SEM), X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), atomic force microscopy (AFM) and Fourier transform infrared spectroscop...
Source: Carbohydrate Polymers - Category: Biomedical Science Source Type: research
AbstractIntroductionIn order to improve care for victims of sexual assault, specialized assault centers have been developed globally, providing medical, psychological and legal care in one place. Our assault center serves a large population in the center of Israel. In 2010, we initiated a program aimed to prevent assaults among minors and to encourage early referral of victims to the center. The goal of the current study was to assess the impact of this program by comparing the characteristics of sexual assaults before and after its initiation.Material and methodsWe conducted a historic cohort study of all victims of sexua...
Source: Acta Obstetricia et Gynecologica Scandinavica - Category: OBGYN Authors: Tags: ORIGINAL RESEARCH ARTICLE Source Type: research
The objective of this study is to investigate the association between circulating PCSK9 levels and the presence of hepatic steatosis, as well as with liver biomarkers in a cohort of healthy individuals. METHODS: Total PCSK9 levels were measured by an in-house ELISA using a polyclonal antibody. Plasma albumin, alkaline phosphatase, ALT, AST, total bilirubin and GGT were measured in 698 individuals using the COBAS system. The presence of hepatic steatosis was assessed using ultrasound liver scans. RESULTS: In a multiple regression model adjusted for age, sex, insulin resistance, body mass index and alcohol use, cir...
Source: Clinical Biochemistry - Category: Biochemistry Authors: Tags: Clin Biochem Source Type: research
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