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https://www.readbyqxmd.com/read/29786921/room-temperature-ferroelectricity-in-an-organic-cocrystal
#1
Adam J Matzger, Ren A Wiscons, Nagula Rajesh Goud, Joshua T Damron
Ferroelectric materials exhibit switchable remanent polarization due to reversible symmetry breaking under an applied electric field. Previous research has leveraged temperature-induced neutral-ionic transitions in charge-transfer (CT) cocrystals to access ferroelectrics that operate through displacement of molecules under an applied field. However, displacive ferroelectric behavior is rare in organic CT cocrystals and achieving a Curie temperature (TC) above ambient has been elusive. Here a cocrystal between acenaphthene and 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane is presented that shows switchable remanent polarization at room temperature (TC = 68°C)...
May 22, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29786617/fabrication-of-hollow-boron-doped-diamond-nanostructure-via-electrochemical-corrosion-of-a-tungsten-oxide-template
#2
Young-Kyun Lim, Choong-Hyun Lee, Eung-Seok Lee, Dae-Soon Lim
In the study, a hollow boron-doped diamond (BDD) nanostructure electrode is fabricated to increase the reactive surface area for electrochemical applications. Tungsten oxide nanorods are deposited on the silicon substrate as a template by the hot filament chemical vapor deposition (HFCVD) method. The template is coated with a 100 nm BDD layer deposited by HFCVD to form a core-shell nanostructure. The WOx core is finally electrochemically dissolved to form hollow BDD nanostructure. The fabricated hollow BDD nanostructure electrode is investigated via scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Raman spectroscopy...
May 22, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29786600/shock-synthesis-and-characterization-of-titanium-dioxide-with-%C3%AE-pbo-sub-2-sub-structure
#3
Zhen Tan, Pengwan Chen, Qiang Zhou, Jianjun Liu, Xiaofeng Mei, Bi Wang, Naifu Cui
The phase transformation behavior of anatase and rutile titanium dioxide with particle sizes of 60 nm and 150 nm under shock compression have been investigated. To increase the shock pressure and reduce the shock temperature, copper powder and a small amount of paraffin were mixed with the TiO2 powder. The shock recovered samples were characterized by X-ray diffraction, Raman spectroscopy, and transmission electron microscope. The results indicate that both anatase and rutile TiO2 can transform to α-PbO2 phase TiO2 through shock-induced phase transition...
May 22, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29784422/development-of-a-sers-strategy-to-overcome-the-nanoparticle-stabilisation-effect-in-serum-containing-samples-application-to-the-quantification-of-dopamine-in-the-culture-medium-of-pc-12-cells
#4
E Dumont, C De Bleye, J Cailletaud, P-Y Sacré, P-B Van Lerberghe, B Rogister, G A Rance, J W Aylott, Ph Hubert, E Ziemons
The analysis of serum samples by surface-enhanced Raman spectroscopy (SERS) has gained ground over the last few years. However, the stabilisation of colloids by the proteins contained in these samples has restricted their use in common practice, unless antibodies or aptamers are used. Therefore, this work was dedicated to the development of a SERS methodology allowing the analysis of serum samples in a simple and easy-to-implement way. This approach was based on the pre-aggregation of the colloid with a salt solution...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29784412/on-the-use-of-spectra-from-portable-raman-and-atr-ir-instruments-in-synthesis-route-attribution-of-a-chemical-warfare-agent-by-multivariate-modeling
#5
Daniel Wiktelius, Linnea Ahlinder, Andreas Larsson, Karin Höjer Holmgren, Rikard Norlin, Per Ola Andersson
Collecting data under field conditions for forensic investigations of chemical warfare agents calls for the use of portable instruments. In this study, a set of aged, crude preparations of sulfur mustard were characterized spectroscopically without any sample preparation using handheld Raman and portable IR instruments. The spectral data was used to construct Random Forest multivariate models for the attribution of test set samples to the synthetic method used for their production. Colored and fluorescent samples were included in the study, which made Raman spectroscopy challenging although fluorescence was diminished by using an excitation wavelength of 1064 nm...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29784385/simultaneous-isolation-and-detection-of-single-breast-cancer-cells-using-surface-enhanced-raman-spectroscopy
#6
Melina Yarbakht, Maryam Nikkhah, Ahmad Moshaii, Karina Weber, Christian Matthäus, Dana Cialla-May, Jürgen Popp
Nowadays, cancer is one of the most dangerous and deadly disease all around the world. Cancer that is diagnosed at early stages is more likely to be treated successfully. Treatment of progressed cancer is very difficult, and generally surviving rates are much lower. Therefore, much research has been focused on developing non-invasive methods for detection of cancer and monitoring of its progress. Within this contribution, we present a novel strategy for selective isolation and detection of breast cancer cell lines (MCF-7 and BT-20) based on surface enhanced Raman scattering (SERS)...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29784383/sensitive-and-simple-determination-of-zwitterionic-morphine-in-human-urine-based-on-liquid-liquid-micro-extraction-coupled-with-surface-enhanced-raman-spectroscopy
#7
Borong Yu, Chentai Cao, Pan Li, Mei Mao, Qiwen Xie, Liangbao Yang
Morphine, a kind of illicit drugs, is also one of the main heroin metabolites. In consideration of a noninvasive way to monitor and identify drug abuse during forensic cases, the urine samples are usually detected. Here, colloidal gold nanorods (Au NRs) were introduced to act as active substrate, because of the strong optical extinction and spectral tunability of the longitudinal surface plasmon resonance (SPR). Thus, well surface-enhanced Raman spectra of morphine even at low concentrations could be obtained by portable Raman spectrometer...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29784376/spectral-reconstruction-for-shifted-excitation-raman-difference-spectroscopy-serds
#8
Shuxia Guo, Olga Chernavskaia, Jürgen Popp, Thomas Bocklitz
Fluorescence emission is one of the major obstacles to apply Raman spectroscopy in biological investigations. It is usually several orders more intense than Raman scattering and hampers further analysis. In cases where the fluorescence emission is too intense to be efficiently removed via routine mathematical baseline correction algorithms, an alternative approach is needed. One alternative approach is shifted-excitation Raman difference spectroscopy (SERDS), where two Raman spectra are recorded with two slightly different excitation wavelengths...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29784366/raman-spectroscopy-for-wine-analyses-a-comparison-with-near-and-mid-infrared-spectroscopy
#9
Cláudia A Teixeira Dos Santos, Ricardo N M J Páscoa, Patrícia A L S Porto, António L Cerdeira, J M González-Sáiz, C Pizarro, João A Lopes
Routine wine analysis are commonly employed to ensure the quality and safety standards, and to meet consumers' demands and legal requirements. In the last decades, efforts have been done in order to replace the traditional analytical techniques by vibrational spectroscopic techniques such as near infrared (NIR) and mid infrared (MIR) spectroscopy. The potential of these techniques has already been proved by several studies that revealed their ability for the determination of several wine parameters with high levels of precision and accuracy...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29784354/a-comparative-study-of-sterically-and-electro-statically-stabilized-silver-nanoparticles-for-the-determination-of-muscle-relaxant-tizanidine-insights-of-localized-surface-plasmon-resonance-surface-enhanced-raman-spectroscopy-and-electrocatalytic-activity
#10
Marwa R El-Zahry
A comparative study of two types of silver nanoparticles was investigated. The effect of the surface chemistry of the studied silver nanoparticles (AgNPs) on their localized surface plasmon resonance was utilized for the quantitative determination of muscle relaxant tizanidine drug. The studied AgNPs are classified according to the type of stabilizing agent used in their synthesis into electrostatically and sterically stabilized AgNPs. The electrostatically-stabilized AgNPs (AA AgNPs) were prepared using ascorbic acid as both reducing and protective agents in alkaline medium...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29783713/microfluidic-cultivation-and-laser-tweezers-raman-spectroscopy-of-e-coli-under-antibiotic-stress
#11
Zdeněk Pilát, Silvie Bernatová, Jan Ježek, Johanna Kirchhoff, Astrid Tannert, Ute Neugebauer, Ota Samek, Pavel Zemánek
Analyzing the cells in various body fluids can greatly deepen the understanding of the mechanisms governing the cellular physiology. Due to the variability of physiological and metabolic states, it is important to be able to perform such studies on individual cells. Therefore, we developed an optofluidic system in which we precisely manipulated and monitored individual cells of Escherichia coli . We tested optical micromanipulation in a microfluidic chamber chip by transferring individual bacteria into the chambers...
May 18, 2018: Sensors
https://www.readbyqxmd.com/read/29783697/three-dimensional-bi%C3%A2-te%C3%A2-networks-of-interconnected-nanowires-synthesis-and-optimization
#12
Alejandra Ruiz-Clavijo, Olga Caballero-Calero, Marisol Martín-González
Self-standing Bi₂Te₃ networks of interconnected nanowires were fabricated in three-dimensional porous anodic alumina templates (3D⁻AAO) with a porous structure spreading in all three spatial dimensions. Pulsed electrodeposition parameters were optimized to grow highly oriented Bi₂Te₃ interconnected nanowires with stoichiometric composition inside those 3D⁻AAO templates. The nanowire networks were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), and Raman spectroscopy...
May 18, 2018: Nanomaterials
https://www.readbyqxmd.com/read/29781601/artificial-plasmonic-molecules-and-their-interaction-with-real-molecules
#13
Gilad Haran, Lev Chuntonov
Plasmonic molecules are small assemblies of nanosized metal particles. Interactions between the particles modify their optical properties and make them attractive for multiple applications in spectroscopy and sensing. In this review, we focus on basic properties rather than on applications. Plasmonic molecules can be created using either nanofabrication methods or self-assembly techniques in solution. The interaction of plasmonic molecules with light leads to excitations that are classified using the concept of normal modes...
May 21, 2018: Chemical Reviews
https://www.readbyqxmd.com/read/29781477/methyl-rotation-dynamics-in-metal-organic-frameworks-probed-with-terahertz-spectroscopy
#14
Qi Li, Adam J Zaczek, Timothy M Korter, J Axel Zeitler, Michael T Ruggiero
In ZIF-8 and its cobalt analogue ZIF-67, the imidazolate methyl-groups, which point directly into the void space, have been shown to freely rotate - even down to cryogenic temperatures. Using a combination of experimental terahertz time-domain spectroscopy, low-frequency Raman spectroscopy, and state-of-the-art ab initio simulations, the methyl-rotor dynamics in ZIF-8 and ZIF-67 are fully characterized within the context of a quantum-mechanical hindered-rotor model. The results lend insight into the fundamental origins of the experimentally observed methyl-rotor dynamics, and provide valuable insight into the nature of the weak interactions present within this important class of materials...
May 21, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29781061/performance-of-bi-2-o-3-tio-2-prepared-by-sol-gel-on-p-cresol-degradation-under-solar-and-visible-light
#15
Héctor H Vigil-Castillo, Aracely Hernández-Ramírez, Jorge L Guzmán-Mar, Norma A Ramos-Delgado, Minerva Villanueva-Rodríguez
Photocatalytic degradation of p-Cresol was evaluated using the mixed oxide Bi2 O3 /TiO2 (containing 2 and 20% wt. Bi2 O3 referred as TB2 and TB20) and was compared with bare TiO2 under simulated solar radiation. Materials were prepared by the classic sol-gel method. All solids exhibited the anatase phase by X-ray diffraction (XRD) and Raman spectroscopy. The synthesized materials presented lower crystallite size and Eg value, and also higher surface area as Bi2 O3 amount was increased. Bi content was quantified showing near to 70% of theoretical values in TB2 and TB20...
May 21, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29780552/experiments-indicating-a-second-hydrogen-ordered-phase-of-ice-vi
#16
Tobias M Gasser, Alexander V Thoeny, Lucie J Plaga, Karsten W Köster, Martin Etter, Roland Böhmer, Thomas Loerting
In the last twelve years five new ice phases were experimentally prepared. Two of them are empty clathrate hydrates and three of them represent hydrogen ordered counterparts of previously known disordered ice phases. Here, we report on hydrogen ordering in ice VI samples produced by cooling at pressures up to 2.00 GPa. Based on results from calorimetry, dielectric relaxation spectroscopy, Raman spectroscopy, and powder X-ray diffraction the existence of a second hydrogen ordered polymorph related to ice VI is suggested...
May 14, 2018: Chemical Science
https://www.readbyqxmd.com/read/29780511/through-tissue-imaging-of-a-live-breast-cancer-tumour-model-using-handheld-surface-enhanced-spatially-offset-resonance-raman-spectroscopy-sesorrs
#17
Fay Nicolson, Lauren E Jamieson, Samuel Mabbott, Konstantinos Plakas, Neil C Shand, Michael R Detty, Duncan Graham, Karen Faulds
In order to improve patient survival and reduce the amount of unnecessary and traumatic biopsies, non-invasive detection of cancerous tumours is of imperative and urgent need. Multicellular tumour spheroids (MTS) can be used as an ex vivo cancer tumour model, to model in vivo nanoparticle (NP) uptake by the enhanced permeability and retention (EPR) effect. Surface enhanced spatially offset Raman spectroscopy (SESORS) combines both surface enhanced Raman spectroscopy (SERS) and spatially offset Raman spectroscopy (SORS) to yield enhanced Raman signals at much greater sub-surface levels...
April 21, 2018: Chemical Science
https://www.readbyqxmd.com/read/29780199/the-tuning-of-the-plasmon-resonance-of-the-metal-nanoparticles-in-terms-of-the-sers-effect
#18
Z Starowicz, R Wojnarowska-Nowak, P Ozga, E M Sheregii
The Surface-enhanced Raman spectroscopy is the essential tool for various levels of the molecular studies. In order to become widely used as a fast analytical tool, the enhancing structures such as the nanoparticles have to be simple, inexpensive, and offer good flexibility in enhancing properties and the spectral range. In this paper, we investigated the plasmonic properties of the metal nanoparticles, to which the molecules of interest can be adsorbed, forming the bionanocomplexes. Here, for the first time, we provided the collection of the results gathered in one article, which can serve as the basis or guidance for designing the SERS studies on different bionanocomplexes, various nanoparticle structures, sizes, and excitation wavelengths...
2018: Colloid and Polymer Science
https://www.readbyqxmd.com/read/29779627/in-vitro-assessment-of-ribose-modified-two-step-etch-and-rinse-dentine-adhesive
#19
U Daood, J K H Tsoi, P Neelakantan, J P Matinlinna, H A K Omar, M Al-Nabulsi, A S Fawzy
OBJECTIVE: Collagen fibrils aid in anchoring resin composite restorations to the dentine substrate. The aim of the study was to investigate effect of non-enzymatic glycation on bond strength and durability of demineralized dentine specimens in a modified two-step etch-and-rinse dentine adhesive. METHODS: Dentine surfaces were etched with 37% phosphoric acid, bonded with respective in vitro ethanol and acetone adhesives modified with (m/m, 0, 1%, 2% and 3% ribose), restored with restorative composite-resin, and sectioned into resin-dentine slabs and beams to be stored for 24h or 12 months in artificial saliva...
May 17, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29778953/multipath-fabrication-of-hierarchical-cual-layered-double-hydroxide-carbon-fiber-composites-for-the-degradation-of-ammonia-nitrogen
#20
Xiaoming Peng, Min Wang, Fengping Hu, Fengxian Qiu, Tao Zhang, Hongling Dai, Zan Cao
In this work, a series of flower-like CuAl layered double hydroxides (LDHs) and hierarchical CuAl/carbon fiber-LDH (CuAl/CF-LDH) materials were synthesized, and these materials were used as catalysts for the degradation of ammonia nitrogen from simulated wastewater. The morphologies and structures of the materials were characterized using scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy (RS), X-ray diffraction (XRD), and the Brunauer-Emmett-Teller (BET) technique...
May 17, 2018: Journal of Environmental Management
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