scholarly journals Ionic Conductivities of Lithium Phosphorus Oxynitride Glasses, Polycrystals and Thin Films

1994 ◽  
Vol 369 ◽  
Author(s):  
B. Wang ◽  
J. B. Bates ◽  
B. C. Chakoumakos ◽  
B. C. Sales ◽  
B. S. Kwak ◽  
...  
Keyword(s):  
Thin Films ◽  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Photoelectron Spectroscopy ◽  
High Performance ◽  
Ionic Conductivities ◽  
Small Addition ◽  
Impedance Measurements ◽  
X Ray ◽  
Lithium Phosphorus Oxynitride

AbstractVarious lithium phosphorus oxynitrides have been prepared in the form of glasses, polycrystals, and thin films. The structures of these compounds were investigated by X-ray and neutron diffraction, X-ray photoelectron spectroscopy (XPS), and high-performance liquid chromatography (HPLC). The ac impedance measurements indicate a significant improvement of ionic conductivity as the result of incorporation of nitrogen into the structure. In the case of polycrystalline Li2.88PO3.73N0.14 with the γ-Li3PO4 structure, the conductivity increased by several orders of magnitude on small addition of nitrogen. The highest conductivities in the bulk glasses and thin films were found to be 3.0 × 10-7 and 8.9 × 10-7 S-cm-1 at 25°C, respectively.

Use of anti-solvent to enhance thermoelectric response of hybrid-halide perovskite thin films

2022 ◽  
Author(s):  
Shrikant SAINI ◽  
Izuki Matsumoto ◽  
Sakura Kishishita ◽  
Ajay Kumar Baranwal ◽  
Tomohide Yabuki ◽  
...  
Keyword(s):  
Thin Films ◽  
Electrical Conductivity ◽  
Photoelectron Spectroscopy ◽  
High Performance ◽  
Cost Effective ◽  
Performance Tuning ◽  
Charge Carrier Density ◽  
X Ray ◽  
Thermoelectric Energy Harvesting ◽  
Halide Perovskite

Abstract Hybrid halide perovskite has been recently focused on thermoelectric energy harvesting due to the cost-effective fabrication approach and ultra-low thermal conductivity. To achieve high performance, tuning of electrical conductivity is a key parameter that is influenced by grain boundary scattering and charge carrier density. The fabrication process allows tuning these parameters. We report the use of anti-solvent to enhance the thermoelectric performance of lead-free hybrid halide perovskite, CH3NH3SnI3, thin films. Thin films with anti-solvent show higher connectivity in grains and higher Sn+4 oxidation states which results in enhancing the value of electrical conductivity. Thin films were prepared by a cost-effective wet process. Structural and chemical characterizations were performed using x-ray diffraction, scanning electron microscope, and x-ray photoelectron spectroscopy. The value of electrical conductivity and the Seebeck coefficient were measured near room temperature. The high value of power factor (1.55 µW/m.K2 at 320 K) was achieved for thin films treated with anti-solvent.

scholarly journals Silk Textiles from the Topkapi Palace Museum, Istanbul: An Analytical Study

2021 ◽  
pp. 67-75
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Elemental Analysis ◽  
High Performance ◽  
Analytical Study ◽  
Color Measurement ◽  
X Ray ◽  
Scanning Electron

Eight historical textile objects belonging to the 16th-20th centuries in the collection of the Topkapi Palace Museum in Istanbul were analyzed with the purpose of reaching improved conservation and restoration methods. The historical textiles underwent dyestuff analysis by High Performance Liquid Chromatography, morphological and elemental analysis by Scanning Electron Microscope with energy Dispersive X-ray Spectroscopy, CIEL*a*b color measurement as well as technical analysis by optical microscopy.

scholarly journals Enhancement of photovoltage by electronic structure evolution in multiferroic Mn-doped BiFeO3 thin films

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Seiji Nakashima ◽  
Tohru Higuchi ◽  
Akira Yasui ◽  
Toyohiko Kinoshita ◽  
Masaru Shimizu ◽  
...  
Keyword(s):  
Thin Films ◽  
Solar Cells ◽  
Photoelectron Spectroscopy ◽  
High Performance ◽  
Photovoltaic Effect ◽  
Ferroelectric Materials ◽  
Voltage Source ◽  
Structure Evolution ◽  
X Ray ◽  
Converse Piezoelectric Effect

Abstract The bulk photovoltaic effect (BPVE) is a mechanism of recent focus for novel solar cells that exceed the power conversion efficiency of p–n junction solar cells because of the quantum mechanical effect to generate photocurrent known as shift current. Ferroelectrics are receiving attention again because of their high voltage generation by the BPVE and converse piezoelectric effect to realize high performance optical actuators. We have investigated the BPVE in ferroelectric BiFeO3 (BFO) single crystal thin films, whereby the photovoltage was enhanced by Mn doping, and 852 V generation was demonstrated at 80 K. The enhancement mechanism was also investigated using soft and hard X-ray photoelectron spectroscopy (SXPES, HAXPES), and soft X-ray absorption spectroscopy with synchrotron radiation. This report reveals a way to new voltage source applications employing the BPVE for high impedance devices with ferroelectrics. Important aspects for designing ferroelectric materials by impurity doping are also discussed.

scholarly journals Reusable and sustainable graphene oxide/metal–organic framework-74/Fe3O4/polytyramine nanocomposite for simultaneous trace level quantification of five fluoroquinolones in egg samples by high performance liquid chromatography

2021 ◽  
Vol 4 (02) ◽  
pp. 5-24
Author(s):  
Fatemeh Pourbahman ◽  
Mohsen Zeeb ◽  
Amirhossein Monzavi ◽  
Zahra Khodadadi ◽  
Seyed Saied Homami
Keyword(s):  
High Performance Liquid Chromatography ◽  
Graphene Oxide ◽  
Liquid Chromatography ◽  
High Performance ◽  
Solid Phase ◽  
Metal Organic Framework ◽  
Oxidative Polymerization ◽  
X Ray ◽  
Metal Organic ◽  
Organic Framework

A nanohybrid material termed graphene oxide/metal-organic framework-74/Fe3O4/polytyramine (GO/MOF-74/Fe3O4­/PTy) was fabricated and applied in magnetic dispersive micro-solid phase extraction (MD-µ-SPE) coupled with high performance liquid chromatography (HPLC) for simultaneous determination of fluoroquinolones compounds including, ofloxacin, ciprofloxacin, lomefloxacin, enrofloxacin and sperfloxacin in egg samples. The GO/MOF-74/Fe3O4/PTy nanocomposite was fabricated through an in situ synthesis of MOF-74 in the presence of magnetic GO and followed with an oxidative polymerization of tyramine using horsedish peroxide (HRP) enzyme. The modifier agents improved the merits of the nanoporous sorbent. Extraction protocols based on GO/MOF nanocomposites have various benefit such as, the high stability, the tunable porosity, the fast mast transfer and reasonable enrichment factor. The fabricated material was characterized via energy dispersive x-ray analysis (EDX), the scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FT-IR), and the x-ray diffraction (XRD). The calibration curves revealed linearity (0.992 ≤ r2 ≤ 0.997) in the ranges of 1.0-475.0, 0.5-350.0, 0.5-350.0, 0.5-375.0 and 1.5-300.0 ng mL-1 with limit of detections (LODs, S/N=3) of 0.3, 0.1, 0.2, 0.1 and 0.4 ng mL-1 for ofloxacin, ciprofloxacin, lomefloxacin, enrofloxacin and sperfloxacin, respectively. The intra-assay (≤7.7%, n = 9) and inter-assay (≤7.0%, n = 9) precisions along with accuracy less than 9.0% were obtained.

Combined sampler robot and high-performance liquid chromatography: a fully automated system for biological small-angle X-ray scattering experiments at the Synchrotron SOLEIL SWING beamline

2009 ◽  
Vol 42 (5) ◽  
pp. 892-900 ◽  
Author(s):  
G. David ◽  
J. Pérez
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Small Angle ◽  
High Performance ◽  
Automated System ◽  
Combined System ◽  
X Ray ◽  
X Ray Crystallography ◽  
X Ray Scattering ◽  
Ray Scattering

Small-angle X-ray scattering for macromolecules in solution is now widely used in structural biology to complement high-resolution structure determination obtained by X-ray crystallography or NMR. In the context of third-generation synchrotron sources, this increasing interest leads to developments in sample environments and automation. The presence of an online purification system is justified by the need for sample monodispersity. A combined system including an auto-sampler robot and online high-performance liquid chromatography (HPLC) has been developed and optimized at the SWING beamline of Synchrotron SOLEIL (Gif-sur-Yvette, France). In the sample changer mode, a few microlitres of sample can be injected between two air bubbles and circulated at a controlled speed of typically 40 µl min−1. A maximum of 14 samples per hour could be measured in this mode by remote controlling the sample injections. In the HPLC mode, an initially polydisperse sample can be separated into each of its components before immediate data acquisition. The sample cell is thermostated, and offers a visualization control and online UV–Vis absorption monitoring.

scholarly journals Chromatographic determination of siphonodin content: A rapid and simple strategy for discriminating between Hemsleya omeiensis and other sources of Xuedan

2021 ◽  
Vol 18 (4) ◽  
pp. 837-842
Author(s):  
Yi Qin ◽  
Hong-ling Zhang ◽  
Jin Wang ◽  
Qin-wan Huang ◽  
Ji-lin Sun ◽  
...  
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
High Performance ◽  
Chromatographic Determination ◽  
Hplc Method ◽  
Crystallographic Analysis ◽  
X Ray ◽  
Simple Strategy ◽  
The Mean

Purpose: To develop a rapid and simple siphonodin content-based high performance liquid chromatography (HPLC) method to distinguish Hemsleya omeiensis from other sources of xuedan. Methods: Siphonodin was isolated from Hemsleya omeiensis and identified by x-ray crystallographic analysis. An optimized HPLC method was applied for the determination of siphonodin contents of H. omeiensis, H. dolichocarpa and H. gigantha. Results: Siphonodin was successfully separated by the optimized HPLC method in < 10 min, and the results of validation showed that the HPLC method was stable and very accurate for the quantification of siphonodin. The mean content of siphonodin in 10 batches of H. omeiensis was 3.78 mg/g, but the compound was not detectable in H. dolichocarpa and H. gigantha using the developed HPLC method. Conclusion: These results indicate that the developed HPLC method is suitable for distinguishing H. omeiensis from other sources of xuedan.

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