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https://www.readbyqxmd.com/read/28742922/intracellular-imaging-of-docosanol-in-living-cells-by-coherent-anti-stokes-raman-scattering-microscopy
#1
Sixian You, Yuan Liu, Zane Arp, Youbo Zhao, Eric J Chaney, Marina Marjanovic, Stephen A Boppart
No abstract text is available yet for this article.
July 1, 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/28742359/pressure-induced-structural-and-optical-properties-of-inorganic-halide-perovskite-cspbbr3
#2
Long Zhang, Qingxin Zeng, Kai Wang
Perovskite photovoltaic materials are gaining sustained attention because of their excellent photovoltaic properties and extensive practical applicability. In this letter, we discussed the changes in the structure and optical properties of CsPbBr3 under high pressure. As the pressure increases, the band gap initially begun to redshift before 1.0 GPa followed by continuous blue shift until the crystal was completely amorphized. An isostructural phase transition at 1.2 GPa was determined by high-pressure synchrotron X-ray and Raman spectroscopy...
July 25, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28742340/structure-and-electrical-transport-relations-in-ba-zr-pr-o3-%C3%AE-perovskites
#3
Isabel Antunes, Ulises Amador, Adriana Alves, Maria Rosário Correia, Clemens Ritter, Jorge Ribeiro Frade, Domingo Pérez-Coll, Glenn C Mather, Duncan Paul Fagg
Members of the perovskite solid solution BaZr1-xPrxO3-δ (0.2 ≤ x ≤ 0.8) with potential high-temperature electrochemical applications were synthesized via mechanical activation and high-temperature annealing at 1250 °C. Structural properties were examined by Rietveld analysis of neutron powder diffraction and Raman spectroscopy at room temperature, indicating rhombohedral symmetry (space group R3̅c) for members x = 0.2 and 0.4 and orthorhombic symmetry (Imma) for x = 0.6 and 0.8. The sequence of phase transitions for the complete solid solution from BaZrO3 to BaPrO3 is Pm3̅m → R3̅c → Imma → Pnma...
July 25, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28742326/tellurium-impregnated-porous-cobalt-doped-carbon-polyhedra-as-superior-cathode-for-lithium-tellurium-batteries
#4
Jiarui He, Weiqiang Lv, Yuanfu Chen, Kechun Wen, Chen Xu, Wanli Zhang, Yanrong Li, Wu Qin, Weidong He
Lithium-tellurium (Li-Te) batteries are attractive for energy storage owing to a high theoretical volumetric capacity of 2621 mAh cm-3. In this work, highly nanoporous cobalt and nitrogen co-doped carbon polyhedra (C-Co-N) derived from metal-organic framework (MOF) is synthesized and employed as tellurium host for Li-Te batteries. The Te@C-Co-N cathode with a high Te loading of 77.2 wt% exhibits record-breaking electrochemical performances including an ultrahigh initial capacity of 2615.2 mAh cm-3 approaching the theoretical capacity of Te (2621 mAh cm-3), a superior cycling stability with a high capacity retention of 93...
July 25, 2017: ACS Nano
https://www.readbyqxmd.com/read/28741948/high-pressure-phases-of-a-s-based-compound-dimethyl-sulfide
#5
Qingmei Zhang, Zhenxing Qin, Xiaozhi Zhan
The high-pressure behavior of dimethyl sulfide was investigated at room temperature by Raman scattering measurements with pressures up to 30.1 GPa. Phase transitions at 1.3, 3.6-5.8, and 17.2 GPa were found and evidenced by the frequency shifts, pressure coefficients and changes in FWHM of related modes. These phase transitions were suggested to result from the changes in the inter- and intra-molecular bonding of the material. Interestingly, the CH3 groups was compelled to be frozen in positions at a relatively low pressure, suggested by the disappearing of the relative modes softening...
July 25, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28741933/functionalized-cobalt-triarylcorrole-covalently-bonded-with-graphene-oxide-a-selective-catalyst-for-the-two-or-four-electron-reduction-of-oxygen
#6
Jijun Tang, Zhongping Ou, Rui Guo, Yuanyuan Fang, Dong Huang, Jing Zhang, Jiaoxia Zhang, Song Guo, Frederick M McFarland, Karl M Kadish
A cobalt triphenylcorrole (CorCo) was covalently bonded to graphene oxide (GO), and the resulting product, represented as GO-CorCo, was characterized by UV-vis, FT-IR, and micro-Raman spectroscopy as well as by HRTEM, TGA, XRD, XPS, and AFM. The electrocatalytic activity of GO-CorCo toward the oxygen reduction reaction (ORR) was then examined in air-saturated 0.1 M KOH and 0.5 M H2SO4 solutions by cyclic voltammetry and linear sweep voltammetry using a rotating disk electrode and/or a rotating ring-disk electrode...
July 25, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28740988/sandwiched-gold-pnipam-gold-microstructures-for-smart-plasmonics-application-towards-the-high-detection-limit-and-raman-quantitative-measurements
#7
R Elashnikov, D Mares, T Podzimek, V Švorčík, O Lyutakov
A smart plasmonic sensor, comprising a layer of a stimuli-responsive polymer sandwiched between two gold layers, is reported. As a stimuli-responsive material, a monolayer of poly(N-isopropylacrylamide) (PNIPAm) crosslinked globules is used. A quasi-periodic structure of the top gold layer facilitates efficient excitation and serves as a support for plasmon excitation and propagation. The intermediate layer of PNIPAm efficiently entraps targeted molecules from solutions. The sensor structure was optimized for efficient light focusing in the "active" PNIPAm layer...
July 25, 2017: Analyst
https://www.readbyqxmd.com/read/28740860/tunable-and-laser-reconfigurable-2d-heterocrystals-obtained-by-epitaxial-stacking-of-crystallographically-incommensurate-bi2se3-and-mos2-atomic-layers
#8
Anthony Vargas, Fangze Liu, Christopher Lane, Daniel Rubin, Ismail Bilgin, Zachariah Hennighausen, Matthew DeCapua, Arun Bansil, Swastik Kar
Vertical stacking is widely viewed as a promising approach for designing advanced functionalities using two-dimensional (2D) materials. Combining crystallographically commensurate materials in these 2D stacks has been shown to result in rich new electronic structure, magnetotransport, and optical properties. In this context, vertical stacks of crystallographically incommensurate 2D materials with well-defined crystallographic order are a counterintuitive concept and, hence, fundamentally intriguing. We show that crystallographically dissimilar and incommensurate atomically thin MoS2 and Bi2Se3 layers can form rotationally aligned stacks with long-range crystallographic order...
July 2017: Science Advances
https://www.readbyqxmd.com/read/28740794/tissue-expanders-and-proton-beam-radiotherapy-what-you-need-to-know
#9
Ashley L Howarth, Joshua R Niska, Kenneth Brooks, Aman Anand, Martin Bues, Carlos E Vargas, Raman C Mahabir
Proton beam radiotherapy (PBR) has gained acceptance for the treatment of breast cancer because of unique beam characteristics that allow superior dose distributions with optimal dose to the target and limited collateral damage to adjacent normal tissue, especially to the heart and lungs. To determine the compatibility of breast tissue expanders (TEs) with PBR, we evaluated the structural and dosimetric properties of 2 ex vivo models: 1 model with internal struts and another model without an internal structure...
June 2017: Plastic and Reconstructive Surgery. Global Open
https://www.readbyqxmd.com/read/28738633/application-of-raman-spectroscopy-for-direct-analysis-of-carlina-acanthifolia-subsp-utzka-root-essential-oil
#10
Maciej Strzemski, Magdalena Wójciak-Kosior, Ireneusz Sowa, Monika Agacka-Mołdoch, Piotr Drączkowski, Dariusz Matosiuk, Łukasz Kurach, Ryszard Kocjan, Sławomir Dresler
Carlina genus plants e.g. Carlina acanthifolia subsp. utzka have been still used in folk medicine of many European countries and its biological activity is mostly associated with root essential oils. In the present paper, Raman spectroscopy (RS) was applied for the first time for evaluation of essential oil distribution in root of C. acnthifolia subsp. utzka and identification of root structures containing the essential oil. Furthermore, RS technique was applied to assess chemical stability of oil during drying of plant material or distillation process...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738632/raman-hyperspectral-imaging-in-conjunction-with-independent-component-analysis-as-a-forensic-tool-for-explosive-analysis-the-case-of-an-atm-explosion
#11
Mariana Ramos Almeida, Lucio Paulo Lima Logrado, Jorge Jardim Zacca, Deleon Nascimento Correa, Ronei Jesus Poppi
In this work, Raman hyperspectral imaging, in conjunction with independent component analysis, was employed as an analytical methodology to detect an ammonium nitrate fuel oil (ANFO) explosive in banknotes after an ATM explosion experiment. The proposed methodology allows for the identification of the ANFO explosive without sample preparation or destroying the sample, at quantities as small as 70μgcm(-2). The explosive was identified following ICA data decomposition by the characteristic nitrate band at 1044cm(-1)...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738584/production-of-stable-and-sensitive-sers-substrate-based-on-commercialized-porous-material-of-silanized-support
#12
Han Zhang, Lin Sun, Yuan Zhang, Yan Kang, Huilian Hu, Huirong Tang, Yiping Du
This paper reports accurate synthesis of a new type of surface-enhanced Raman spectroscopy (SERS) substrate based on gold nanoparticles decorated 201 red silanized diatomaceous supports. The developed SERS substrate is easy to fabricate, cost effective and offers sensitive rapid detection. The performance and stability of the SERS substrate was investigated and the results showed good SERS activity of substrate that can last for more than 6 months. Tiazophos and phosmet pesticides in aqueous solutions can be detected clearly at a low concentration of 0...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738567/application-of-thermoresponsive-hydrogel-gold-nanorods-composites-in-the-detection-of-diquat
#13
Caiyun Jiang, Xiaoyuan Ma, Maoyun Xue, Hong-Zhen Lian
Gallic acid (GA) was employed as a reducing agent for facile in situ preparation of gold nanorods (GNRs) in thermoresponsive P(NIPAM-NVP) hydrogel films. Based on the surface-enhanced Raman scattering (SERS) effect of GNRs and the enrichment effect of thermoresponsive hydrogel film on test molecules through a shrinkage process, the obtained P(NIPAM-NVP)/GNRs composites have been used as SERS substrate for the rapid detection of diquat. The influences of substrate pre-treatment, laser wavelength, and sample treatment method on diquat determination have been investigated comprehensively...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738278/well-dispersed-rhenium-nanoparticles-on-three-dimensional-carbon-nanostructures-efficient-catalysts-for-the-reduction-of-aromatic-nitro-compounds
#14
Pitchaimani Veerakumar, Pounraj Thanasekaran, King-Chuen Lin, Shang-Bin Liu
Rhenium nanoparticles (ReNPs) supported on ordered mesoporous carbon (OMC) as a catalyst (Re/OMC) through a solvent-evaporation induced self-assembly (ELSA) method were prepared. The synthesized heterogonous catalyst was fully characterized using X-ray diffraction, field emission transmission electron microscopy, N2 sorption, metal dispersion, thermogravimetric analysis, Raman, Fourier-transform infrared, and X-ray photon spectroscopies. In addition, the catalyst was applied to reduce the aromatic nitro compounds (ANCs) for the first time in aqueous media and the reactions were monitored by following the intensity changes in the UV-vis absorption spectra with respect to time...
July 18, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28737921/investigation-of-mass-produced-substrates-for-reproducible-surface-enhanced-raman-scattering-measurements-over-large-areas
#15
Andreas Reyer, Adrian Prinz, Stefano Giancristofaro, Johannes Schneider, Durval Bertoldo Menezes, Gregor Zickler, Gilles R Bourret, Maurizio E Musso
Surface-enhanced Raman scattering (SERS) is a versatile spectroscopic technique that suffers from reproducibility issues and usually requires complex substrate fabrication processes. In this article, we report the use of a simple mass production technology based on Blu-ray disc manufacturing technology to prepare large area SERS substrates (∼40 mm(2)) with a high degree of homogeneity (±7% variation in Raman signal) and enhancement factor of ∼6 × 10(6). An industrial high throughput injection molding process was used to generate periodic microstructured polymer substrates coated with a thin Ag film...
July 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28737910/raman-and-ir-spectroscopy-studies-on-propane-at-pressures-of-up-to-40-gpa
#16
Daniil Kudryavtsev, Aleksandr Serovaiskii, Elena Mukhina, Anton Kolesnikov, Biliana Gasharova, Vladimir Kutcherov, Leonid S Dubrovinsky
Raman and IR spectroscopy studies on propane were performed at pressures of up to 40 GPa at ambient temperatures using the diamond anvil cell technique. Propane undergoes three phase transitions at 6.4(5) GPa, 14.5(5) GPa, and 26.5(5) GPa in Raman spectroscopy and at 7.0(5) GPa, 14.0(5) GPa and 27.0(5) GPa in IR spectroscopy. The phase transitions were identified using the Raman and IR splitting modes and the appearance or disappearance of peaks, which clearly corresponded to the changes in the frequencies of the modes as the pressure changed...
July 24, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28737720/a-simple-and-highly-sensitive-thymine-sensor-for-mercury-ion-detection-based-on-surface-enhanced-raman-spectroscopy-and-the-mechanism-study
#17
Hao Yang, Sui-Bo Ye, Yu Fu, Weihong Zhang, Fangyan Xie, Li Gong, Ping-Ping Fang, Jian Chen, Yexiang Tong
Mercury ion (Hg(2+)) is recognized as one of the most toxic metal ions for the environment and for human health. Techniques utilized in the detection of Hg(2+) are an important factor. Herein, a simple thymine was successfully employed as the surface enhanced Raman spectroscopy sensor for Hg(2+) ion detection. The limit of detection (LOD) of the developed sensor is better than 0.1 nM (0.02 ppb). This sensor can also selectively distinguish Hg(2+) ions over 7 types of alkali, heavy metal and transition-metal ions...
July 24, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28737374/an-integrated-sers-based-microdroplet-platform-for-the-automated-immunoassay-of-f1-antigens-in-yersinia-pestis
#18
Namhyun Choi, Jiyoung Lee, Juhui Ko, Jun Ho Jeon, Gi-Eun Rhie, Andrew J deMello, Jaebum Choo
The development of surface-enhanced Raman scattering (SERS)-based microfluidic platforms has attracted significant recent attention in the biological sciences. SERS is a highly sensitive detection modality, with microfluidic platforms providing many advantages over microscale methods, including high analytical throughput, facile automation and reduced sample requirements. Accordingly, the integration of SERS with microfluidic platforms offers significant utility in chemical and biological experimentation. Herein, we report a fully integrated SERS-based microdroplet platform for the automatic immunoassay of specific antigen fraction 1 (F1) in Yersinia pestis...
July 24, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28737182/micro-and-nano-patterned-elastin-like-polypeptide-hydrogels-for-stem-cell-culture
#19
A Paul, M Stührenberg, S Chen, D Rhee, W-K Lee, T W Odom, S C Heilshorn, A Enejder
We show that submicron-sized patterns can be imprinted into soft, recombinant-engineered protein hydrogels (here elastin-like proteins, ELP) by transferring wavy patterns from polydimethylsiloxane (PDMS) molds. The high-precision topographical tunability of the relatively stiff PDMS is translated to a bio-responsive, soft material, enabling topographical cell response studies at elastic moduli matching those of tissues. Aligned and unaligned wavy patterns with mold periodicities of 0.24-4.54 μm were imprinted and characterized by coherent anti-Stokes Raman scattering and atomic force microscopy...
July 24, 2017: Soft Matter
https://www.readbyqxmd.com/read/28736959/in-vivo-raman-spectroscopy-assisted-early-identification-of-potential-second-primary-recurrences-in-oral-cancers-an-exploratory-study
#20
Akshat Malik, Aditi Sahu, S P Singh, Atul Deshmukh, Pankaj Chaturvedi, Deepa Nair, Sudhir Nair, C Murali Krishna
BACKGROUND: Higher rates of local recurrences and second primaries, ascribable to field cancerization, are known problem in oral cancers. The present study explored utility of identification of potential recurrences by Raman spectroscopy, which has been shown to identify oral precancers, cancers, and field cancerization in humans and micro-sized mechanical irritation-induced tumors in animals. METHODS: Raman spectra were acquired from tumor and contralateral normal mucosa in 99 patients with oral cancer who were then followed up for appearance of clinically apparent cancerous lesions...
July 24, 2017: Head & Neck
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