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Fabiana Spadaro, Antonella Rossi, Shivaprakash N Ramakrishna, Emmanuel Lainé, Philip Woodward, Nicholas D Spencer
The discovery of the spontaneous reaction of boric oxides with moisture in the air to form lubricious H3BO3 films has led to great interest in the tribology of boron compounds in general. Despite this, a study of the growth kinetics of H3BO3 on a B2O3 substrate under controlled relative humidity (RH), has not yet been reported in the literature. Here, we describe the tribological properties of H3BO3-B2O3 glass systems after aging under controlled relative humidity over different lengths of time. A series of tribological tests has been performed applying a normal load of 15 N, at both room temperature and 100°C in Yubase 4 oil...
January 15, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Arup Choudhury, Baban Dey, Susanta Sinha Mahapatra, Doo-Won Kim, Kap-Seung Yang, Duck J Yang
Nanostructured poly(m-aminophenol) (PmAP) coated freestanding carbon nanofiber (CNF) mats were fabricated through simple in-situ rapid-mixing polymerization of m-aminophenol in presence of CNF mat for flexible solid-state supercapacitors. The surface compositions, morphology and pore structure of the hybrid mats were characterized by using different techniques, e.g., FTIR, Raman, XRD, FE-SEM, TEM and N2 absorption. The results show that the PmAP nanoparticles homogeneously deposited on CNF surfaces and formed a thin flexible hybrid mat, which were directly used to made electrodes for electrochemical analysis without using any binders and conductive additives...
January 15, 2018: Nanotechnology
Wei-Che Hsieh, Raman Bahal, Shivaji Thadke, Kirti Bhatt, Krzysztof Sobczak, Charles A Thornton, Danith H Ly
Toxic RNAs containing expanded trinucleotide repeats are the cause of many neuromuscular disorders, one being myotonic dystrophy type 1 (DM1). DM1 is triggered by CTG-repeat expansion in the 3'-UTR of the DMPK gene, resulting in toxic-gain of RNA function through sequestration of MBNL1 protein, among others. Herein we report the development of a relatively short MPPNA probe, two triplet-repeats in length, containing terminal pyrene moieties, that is capable of binding rCUG-repeats in a sequence-specific and selective manner...
January 15, 2018: Biochemistry
Weichun Huang, Chenyang Xing, Yunzheng Wang, Zhongjun Li, Leiming Wu, Dingtao Ma, Xiaoyu Dai, Yuanjiang Xiang, Jianqing Li, Dianyuan Fan, Han Zhang
Two-dimensional (2D) bismuth(iii) sulfide (Bi2S3) nanosheets as non-toxic graphene-like nanomaterials were successfully fabricated by a facile liquid phase exfoliation (LPE) method. A robust photodetector employing a Bi2S3 nanosheet film has been fabricated for the first time via a facile fabrication process on an ITO-coated glass. UV-Vis and Raman spectroscopy techniques were carried out and they confirmed the inherent optical and physical properties of Bi2S3 nanosheets. Photoelectrochemical (PEC) measurements demonstrate that a significantly higher photocurrent density (42 μA cm-2) and enhanced photoresponsivity (210 μA W-1), at a lower bias potential in alkaline solution, of the Bi2S3 nanosheet-based photodetector are achieved, compared with those of other 2D nanomaterial-based photodetectors under light irradiation...
January 15, 2018: Nanoscale
Fanghao Hu, Chen Zeng, Rong Long, Yupeng Miao, Lu Wei, Qizhi Xu, Wei Min
Optical multiplexing has a large impact in photonics, the life sciences and biomedicine. However, current technology is limited by a 'multiplexing ceiling' from existing optical materials. Here we engineered a class of polyyne-based materials for optical supermultiplexing. We achieved 20 distinct Raman frequencies, as 'Carbon rainbow', through rational engineering of conjugation length, bond-selective isotope doping and end-capping substitution of polyynes. With further probe functionalization, we demonstrated ten-color organelle imaging in individual living cells with high specificity, sensitivity and photostability...
January 15, 2018: Nature Methods
Kunal Bhattacharya, Cristiano Sacchetti, Pedro M Costa, Jens Sommertune, Birgit D Brandner, Andrea Magrini, Nicola Rosato, Nunzio Bottini, Massimo Bottini, Bengt Fadeel
Polyethylene glycol (PEG)-modified carbon nanotubes have been successfully employed for intra-articular delivery in mice without systemic or local toxicity. However, the fate of the delivery system itself remains to be understood. In this study 2 kDa PEG-modified single-walled carbon nanotubes (PNTs) are synthesized, and trafficking and degradation following intra-articular injection into the knee-joint of healthy mice are studied. Using confocal Raman microspectroscopy, PNTs can be imaged in the knee-joint and are found to either egress from the synovial cavity or undergo biodegradation over a period of 3 weeks...
January 15, 2018: Advanced Healthcare Materials
Edurne Nuin, Vicent Lloret, Konstantin Amsharov, Frank Hauke, Gonzalo Abellán, Andreas Hirsch
The synthesis and characterization of a new type of a highly conjugated heterocyclic π-chromophore, consisting of a central triphenylene core fused with three perylene-monoimide units (star-shaped molecule) is described. By judicious bay-functionalization with tert-butylphenoxy substituents, aggregation was completely prevented in common organic solvents, allowing for a straightforward purification and, for the very first time, the complete separation of the constitutional isomers by HPLC. Both isomers can be easily distinguished by means of several conventional spectroscopic techniques...
January 15, 2018: Chemistry: a European Journal
Haotian Shi, Nirakar Poudel, Bingya Hou, Lang Shen, Jihan Chen, Alexander V Benderskii, Stephen B Cronin
We report a novel approach to probe the local ion concentration at graphene/water interfaces using in situ Raman spectroscopy. Here, the upshifts observed in the G band Raman mode under applied electrochemical potentials are used to determine the charge density in the graphene sheet. For voltages up to ±0.8 V vs. NHE, we observe substantial upshifts in the G band Raman mode by as much as 19 cm-1, which corresponds to electron and hole carrier densities of 1.4 × 1013 cm-2 and Fermi energy shifts of ±430 meV...
January 15, 2018: Nanoscale
Debasree Burman, Sumita Santra, Panchanan Pramanik, Prasanta Kumar Guha
In this work, we report the fabrication of a low power, humidity sensor where platinum nanoparticles (NPs) decorated few-layered Molybdenum disulphide (MoS<sub>2</sub>) nanoflakes have been used as the sensing layer. A mixed solvent was used to exfoliate the nanoflakes from the bulk powder. Then the Pt/MoS<sub>2</sub> composites were prepared by reducing Pt NPs from chloroplatinic acid hexahydrate using a novel reduction technique using sulfide salt. The successful reduction and composite preparation were confirmed using various material characterization tools like Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), Transmission Electron Microscopy (TEM), X-Ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Raman spectroscopy and UV-visible spectroscopy (UV-Vis)...
January 15, 2018: Nanotechnology
Ya-Ling Su, Shu-Hua Cheng
The toxicity of sulfa drugs has attracted great attention, and the reported electrochemical methods for sulfa drugs usually employ a high oxidation potential. In this work, a one-pot synthesized conducting polymer nanocomposite containing poly(3,4-ethylenedioxythiophene) (PEDOT) and MnO2 was cast on a screen-printed carbon electrode (SPCE), and the modified electrode showed superior electrochemical activity over a bare electrode for sulfamethazine (SMZ) determination. The SMZ detection was based on the electrochemical oxidation product, which showed an adsorptive property and exhibited a redox couple at 0...
April 1, 2018: Talanta
Kai-Xuan Xu, Mei-Hong Guo, Yu-Ping Huang, Xiao-Dong Li, Jian-Jun Sun
A highly sensitive and rapid method of in-situ surface-enhanced Raman spectroscopy (SERS) combining with electrochemical preconcentration (EP) in detecting malachite green (MG) in aquaculture water was established. Ag nanoparticles (AgNPs) were synthesized and spread onto the surface of gold electrodes after centrifuging to produce SERS-active substrates. After optimizing the pH values, preconcentration potentials and times, in-situ EP-SERS detection was carried out. A sensitive and rapid analysis of the low-concentration MG was accomplished within 200s and the limit of detection was 2...
April 1, 2018: Talanta
Aradhana Sood, Suvash Sahu, Sandeep Karunakaran, Rajneesh K Joshi, Deep Kumar Raman
BACKGROUND: Changing sociodemographic patterns with an increase in the age of childbirth have affected fertility rates worldwide. With advancing reproductive medicine, assisted reproductive techniques (ARTs) are becoming common. While dermatological manifestations in normal pregnancies have been well documented, there is a paucity of data regarding cutaneous manifestations in patients undergoing ART. OBJECTIVES: The objectives of our study were to estimate the incidence and types of dermatological manifestations in patients undergoing in vitro fertilisation (IVF) and to study their associations with age, type of infertility, and outcome of the procedure...
January 1, 2018: Journal of Cutaneous Medicine and Surgery
Peter Desmond, James P Best, Eberhard Morgenroth, Nicolas Derlon
The effect of extracellular polymeric substances (EPS) on the meso-scale physical structure and hydraulic resistance of membrane biofilms during gravity driven membrane (GDM) filtration was investigated. Biofilms were developed on the surface of ultrafiltration membranes during dead-end filtration at ultra-low pressure (70 mbar). Biofilm EPS composition (total protein, polysaccharide and eDNA) was manipulated by growing biofilms under contrasting nutrient conditions. Nutrient conditions consisted of (i) a nutrient enriched condition with a nutrient ratio of 100:30:10 (C: N: P), (ii) a phosphorus limitation (C: N: P ratio: 100:30:0), and (iii) a nitrogen limitation (C: N: P ratio: 100:0:10)...
December 27, 2017: Water Research
Stephanie M Fowler, Heinar Schmidt, Remy van de Ven, David L Hopkins
A preliminary investigation was conducted to determine the potential for a handheld Raman spectroscopic device to predict sensory traits determined by an untrained consumer panel. Measurement of 45 beef loins (M. longissimus lumborum) was conducted using a 671nm handheld Raman spectroscopic device. Samples were then held frozen until testing by an untrained sensory panel. Sections were also excised to determine shear force values and other indicators of meat quality. Derived models suggest that the Raman spectroscopic device can predict juiciness and tenderness, with correlations between predicted and observed values (ρ) of 0...
January 3, 2018: Meat Science
Jorge L Cholula-Díaz, Diana Lomelí-Marroquín, Bidhan Pramanick, Alfonso Nieto-Argüello, Luis A Cantú-Castillo, Hyundoo Hwang
Ascorbic acid (vitamin C) has an essential role in the human body mainly due to its antioxidant function. In this work, metallic silver nanoparticle (AgNP) colloids were used in SERS experiments to detect ascorbic acid in aqueous solution. The AgNPs were synthesized by a green method using potato starch as reducing and stabilizing agent, and water as the solvent. The optical properties of the yellowish as-synthesized silver colloids were characterized by UV-vis spectroscopy, in which besides a typical band at 410 nm related to the localized surface plasmon resonance of the silver nanoparticles, a shoulder band around 500 nm, due to silver nanoparticle cluster formation, is presented when relatively higher concentrations of starch are used in the synthesis...
December 29, 2017: Colloids and Surfaces. B, Biointerfaces
Sylwia Kucharczyk, Maciej Sitarz, Maciej Zajac, Jan Deja
The influence of CaO/SiO2 molar ratio of calcium aluminosilicate glasses on resulting structure and reactivity was investigated. Chemical compositions of glasses were chosen to mimic the composition of the fly ash and slag amorphous phase. Understanding the reactivity of these materials is of high importance allowing further development of the composite cements to limit the environmental footprint of cement industry. Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy were employed to examine the structure of glasses...
January 5, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Krzysztof Zdunek, Rafał Chodun, Bartosz Wicher, Katarzyna Nowakowska-Langier, Sebastian Okrasa
This paper presents the results of investigations of carbon films deposited by a modified version of the magnetron sputtering method - HiPGIMS (High Power Gas Injection Magnetron Sputtering). In this experiment, the magnetron system with inversely polarized electrodes (sputtered cathode at ground potential and positively biased, spatially separated anode) was used. This arrangement allowed us to conduct the experiment using voltages ranging from 1 to 2kV and a power supply system equipped with 25/50μF capacitor battery...
January 5, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
G Ibáñez-Redín, D Wilson, D Gonçalves, O N Oliveira
A green approach for the preparation of carbon black (CB) and electrochemically reduced graphene oxide composite (ERGO) is described based on screen printed carbon electrodes (SPCEs) fabricated on poly(ethylene terephthalate) (PET) as electrochemical sensors. This approach leads to a heterogeneous hydrophilic surface with high concentration of defect sites according to scanning electron microscopy, contact angle and Raman spectroscopy measurements. The SPCE/CB-ERGO sensor was tested with dopamine (DA), epinephrine (EP) and paracetamol (PCM), exhibiting an enhanced electrocatalytic performance compared to the bare SPCE...
December 30, 2017: Journal of Colloid and Interface Science
Brindha Appavu, Sivakumar Thiripuranthagan, Sudhakar Ranganathan, Elangovan Erusappan, Kathiravan Kannan
Herein, we report the synthesis of novel nitrogen doped reduced graphene oxide/ BiVO4 photo catalyst by single step hydrothermal method. The physicochemical properties of the catalysts were characterized using XRD, N2 adsorption-desorption, Raman, XPS, SEM TEM, DRS-UV and EIS techniques. The synthesized catalysts were tested for their catalytic activity in the photo degradation of some harmful textile dyes (methylene blue & congo red) and antibiotics (metronidazole and chloramphenicol) under visible light irradiation...
January 10, 2018: Ecotoxicology and Environmental Safety
Weiping Ren, Wei Song, Sally Yurgelevic, David C Markel
We previously described the gelation mechanism of calcium polyphosphate (CPP) in the presence of water. In this study, we developed novel and injectable poly-dicalcium phosphate dihydrate (P-DCPD) forming cement by the reaction of acidic CPP gel with alkali tetracalcium phosphate (TTCP). The setting reaction mechanism of P-DCPD is due to the intermolecular interaction between CPP gel and TTCP that was supported by XRD, AFM, Raman spectra analysis and SEM. The setting mechanism of P-DCPD is completely different from the classical calcium phosphate cement (CPC) that achieves crystallization by monophosphates reaction...
January 4, 2018: Journal of the Mechanical Behavior of Biomedical Materials
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