Investigation of interfacial and photoelectrochemical characteristics of thermally treated PbS/TiO2 photoanodes

RSC Advances ◽  
2015 ◽  
Vol 5 (43) ◽  
pp. 33869-33877 ◽  
Author(s):  
Qiang Dong ◽  
Wei Liao ◽  
Bin Wang ◽  
Zhongqing Liu
Keyword(s):  
Thermal Treatment ◽  
Surface Oxidation ◽  
Photoelectrochemical Performance ◽  
Thermally Treated

Thermal treatment induces surface oxidation, enlargement of the PbS QD size and alteration of the exposed crystal faces from {111} to {200}, which all lead to impair the photoelectrochemical performance of PbS/TiO2.

Study of the Bioactive Behavior of Thermally Treated Modified 58S Bioactive Glass

2008 ◽  
Vol 396-398 ◽  
pp. 131-134 ◽  
Author(s):  
Ourania Menti Goudouri ◽  
Xanthippi Chatzistavrou ◽  
Eleana Kontonasaki ◽  
Nikolaos Kantiranis ◽  
Lambrini Papadopoulou ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Bioactive Glass ◽  
Sol Gel ◽  
Bioactive Glasses ◽  
X Ray ◽  
Characteristic Temperatures ◽  
Calcium Silicates ◽  
Crystal Phases ◽  
Thermally Treated

Thermal treatment of bioactive glasses can affect their microstructure and thus their bioactivity. The aim of this study was the characterization of the thermally treated sol-gel-derived bioactive glass 58S at characteristic temperatures and the dependence of its bioactive behavior on the specific thermal treatment. The thermal behavior of the bioactive glass was studied by thermal analysis (TG/DTA). Fourier Transform Infrared Spectroscopy (FTIR) and X-ray Diffractometry (XRD) were used for the characterization of the bioactive glass. The bioactive behavior in Simulated Body Fluid (SBF) was examined by Scanning Electron Microscopy (SEM-EDS) and FTIR. The major crystal phases after thermal treatment were Calcium Silicates, Wollastonite and Pseudowollastonite, while all thermally treated samples developed apatite after 48 hours in SBF. A slight enhancement of bioactivity was observed for the samples heated at the temperature range 910-970oC.

Significantly improve photoelectrochemical performance of Ti:Fe2O3 with CdSe modification and surface oxidation

2018 ◽  
Vol 43 (31) ◽  
pp. 14130-14139 ◽  
Author(s):  
Jinyun Xiong ◽  
Jiale Xie ◽  
Pingping Yang ◽  
Xiaorong Liang ◽  
Chang Ming Li
Keyword(s):  
Surface Oxidation ◽  
Photoelectrochemical Performance

The Improved Photoelectrochemical Performance of WO 3 /BiVO 4 Heterojunction Thin‐Film Photoanodes via Thermal Treatment

2020 ◽  
Vol 8 (5) ◽  
pp. 2000147 ◽  
Author(s):  
Soriya Phiankoh ◽  
Pongthep Prajongtat ◽  
Metta Chareonpanich ◽  
Ratiporn Munprom
Keyword(s):  
Thin Film ◽  
Thermal Treatment ◽  
Photoelectrochemical Performance

scholarly journals A Rheological Model of Sandstones considering Response to Thermal Treatment

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Xingang Wang ◽  
Lei Huang ◽  
Junrong Zhang
Keyword(s):  
Thermal Treatment ◽  
Constitutive Model ◽  
Three Dimensional ◽  
Constitutive Models ◽  
Energy Utilization ◽  
Elastic Response ◽  
Structure Damage ◽  
Rheological Response ◽  
Different Temperatures ◽  
Thermally Treated

Time-dependent rheological response of geomaterials to thermal treatment is a crucial issue in geothermal energy utilization and deep mineral mining. This response, however, has not yet been fully considered in the existing rheological constitutive models for sandstones. In order to experimentally investigate such responses and establish the associated rheological constitutive model, this study considers the sandstone specimens which have been thermally treated under different temperatures. The triaxial rheological test in conjunction with the scanning electron microscope is employed in the investigation to observe the mechanically and macro-/micromorphologically rheological response. Investigation results show that the thermal treatment induces microcracks and microdefects, and subsequently, they propagate during the creep. As a consequence, the heterogeneous deformation occurs, and macrocracks are present, leading to the irregular fluctuation and mutation in strain over time. A higher temperature contributes to a more severe structure damage and in turn reduces the intactness of sandstones and elevates the rheological response. The investigation allows successful establishment of a three-dimensional constitutive equation considering the instantaneous elastic response to thermal treatment. Based on the equation, a nonlinear visco-elastoplastic rheological constitutive model is developed for sandstones. Comparison with three existing rheological models shows that the model developed in this study could well represent the rheological process of the thermally treated sandstones.

Low-temperature pearlite dissociation in iron-carbon alloys by peritectoid transformation reaction

2021 ◽  
Vol 2021 (2) ◽  
pp. 3-13
Author(s):  
Sergey Davydov ◽  
Rodion Filippov ◽  
Alexsandr Moroz
Keyword(s):  
Solid Solution ◽  
Thermal Treatment ◽  
Low Temperature ◽  
Wide Area ◽  
New Techniques ◽  
Carbide Transformation ◽  
Transformation Reaction ◽  
Peritectoid Transformation ◽  
Thermally Treated

Metallographic investigations of thermally treated iron-carbon alloys have shown that in pearlite of the alloys mentioned passes a low-temperature carbide transformation of the peritectoid type at which solid ferrite and cementite solutions form a solid solution of a wide area of homogeneity based on ε-carbide of Fe2C. The analysis of peritectoid transformation opens new techniques of thermal treatment and manufacturing natural nano-strengthened composite alloys of the carbide-carbide class

Effect of Twist Coefficient and Thermal Treatment Temperature on the Properties of PET Yarn

2013 ◽  
Vol 365-366 ◽  
pp. 1046-1049
Author(s):  
Jia Horng Lin ◽  
Po Ching Lu ◽  
Jin Jia Hu ◽  
Yueh Sheng Chen ◽  
Ching Wen Lou
Keyword(s):  
Tensile Strength ◽  
Thermal Treatment ◽  
Polyethylene Terephthalate ◽  
Treatment Temperature ◽  
Temperature Influence ◽  
Thermal Treatment Temperature ◽  
Two Parameters ◽  
Thermally Treated

Twisting has an influence on not only the strength, luster, softness, and elasticity of the yarns, but also the properties of the resulting fabrics. This study aims to evaluate how the rotor twister speed and the thermal treatment temperature influence the properties of the polyethylene terephthalate (PET) plied yarns and wrap yarns. Both yarn types are made with a twist coefficient of 1, 1.5, or 2, and then thermally treated in an oven at 70, 110, and 150 °C. The resulting plied yarns are wrap yarns are tested for tensile strength and elongation, and their surface is also observed by a stereomicroscope to determine the influences of the two parameters. The results of the experiment show that twist coefficient does not influence the tensile strength nor the elongation. The tensile strength of various plied yarns and wrap yarns is approximately 4.4cN/dtex; the variation in the twist coefficients is too small and thus hardly causes any significant differences in the yarns properties.

Collapse Testing of Thermally Treated Line Pipe for Ultra-Deepwater Applications

2004 ◽  
Author(s):  
Duane DeGeer ◽  
Ulrich Marewski ◽  
Hans-Georg Hillenbrand ◽  
Bernadette Weber ◽  
Michael Crawford
Keyword(s):  
Thermal Treatment ◽  
Ring Expansion ◽  
Transportation System ◽  
Full Scale ◽  
Pipeline System ◽  
Outer Diameter ◽  
Test Program ◽  
Line Pipe ◽  
Mardi Gras ◽  
Thermally Treated

The Mardi Gras Transportation System is an ultra deepwater pipeline system that will support a number of prospects in the Gulf of Mexico, including the Holstein, Mad Dog, Atlantis and Thunder Horse field developments. To support the design of the deepest portions of the Mardi Gras Transportation System, a full-scale collapse test program was performed, and was aimed at measuring, quantifying and documenting the increase in pipe strength and collapse resistance as a result of the thermal induction heat treatment effect (thermal aging) from the pipe coating process. This paper presents a summary of the test program and the results of all testing performed on Europipe pipe samples. Two collapse tests and five pressure + bend tests were performed on as-received and thermally treated pipe specimens. These specimens were API Grade X65 line pipe, with an outer diameter of 28 inches (711 mm) and a wall thickness of 1.5 inches (38 mm). Geometric measurements, material coupon tests, and ring expansion tests were also performed. The coupon tests also included specimens taken from the original plate samples from which the full-scale pipes were manufactured, providing data on the effect of the UOE process on circumferential compressive strength. For the thermally treated pipe specimens, thermal treatment was performed by running the specimens through a pipe coating mill, simulating a fusion bond epoxy coating operation. This process involved preheating specimens to 240°C using induction heating. Subsequent material and full-scale tests on these specimens resulted in an increase of cross-sectional residual stresses by almost threefold, an increase of the circumferential compressive yield strength of the pipe by approximately 23% and an increase of pipe collapse strength by approximately 28%. The results of these tests are also compared to the collapse and collapse + bending equations found in the DNV (DNV OSF101) and API (API RP 1111) offshore pipeline codes, as well as the collapse equations found in API Bul 5C3 for downhole casing applications. In particular, it has been shown that the thermal treatment of the UOE pipe specimens can increase the DNV fabrication factor from 0.85 to 1.0.

scholarly journals Effects of Thermal Treatment on Natural Clinoptilolite-Rich Zeolite Behavior in Simulated Biological Fluids

Molecules ◽  
2020 ◽  
Vol 25 (11) ◽  
pp. 2570
Author(s):  
Oana Cadar ◽  
Marin Senila ◽  
Maria-Alexandra Hoaghia ◽  
Daniela Scurtu ◽  
Ion Miu ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Crystalline Structure ◽  
Structural Changes ◽  
Biological Fluids ◽  
Treatment Temperature ◽  
Simulated Gastric Fluid ◽  
Gravimetric Analysis ◽  
X Ray ◽  
Ft Ir ◽  
Thermally Treated

This study presents the effect of thermal treatment (450, 500, 600, 750, and 800 °C) on a Romanian clinoptilolite-rich natural zeolite, along with the interaction of raw and thermally treated zeolites with simulated gastric fluid (SGF, pH = 1.20) at different zeolite to SGF ratios and exposure times. The zeolites were characterized using gravimetric analysis, X-ray fluorescence, powder X-ray diffraction (pXRD), and Fourier transform infrared (FT-IR) spectroscopy. The chemical composition of the zeolite subjected to thermal treatment did not change significantly with the increase of temperature. Structural changes were not detectable by pXRD and FT-IR analyses in the zeolites thermally treated up to 500 °C, while above 600 °C a gradual structural breakdown of zeolite was noticed. At high temperatures, the broad, low-intensity peaks in pXRD patterns indicated the partial amorphization of the crystalline structure. The pXRD and FT-IR analyses showed that the crystalline structure of zeolites remains unaffected after their exposure to SGF. The results revealed that the amounts of Fe, Na, Mg, K, Ca, Al, and Si released depends mainly on the zeolite to SGF ratio, and to a lower extent on the thermal treatment temperature, while the exposure time of 1 to 7 days does not have a significant impact on the elements released in SGF.

The Origin of Luminescence From Cerium Oxide on Silicon

1999 ◽  
Vol 560 ◽  
Author(s):  
Won Chel Choiv ◽  
Ho Nyung Lee ◽  
Yong Kim ◽  
Eun Kyu Kim
Keyword(s):  
Thin Films ◽  
Thermal Treatment ◽  
Cerium Oxide ◽  
Cerium Dioxide ◽  
Room Temperature ◽  
Ultra Violet ◽  
Blue Luminescence ◽  
Luminescent Material ◽  
Uv Emission ◽  
Thermally Treated

ABSTRACTAs the ultra-violet/blue luminescent material, we will introduce the thermal treated cerium oxide on silicon. It has been confirmed a violet/blue luminescence ranging from 358 rim to 450 rnm at room temperature from the thermally treated cerium-dioxide thin films on silicon. As a results of AES and HR-TEM measurement, it was confirmed that cerium silicates were generated by thermal treatment. These cerium silicates such as Ce4.667(SiO4)3O and Ce2Si2O7 are the source of the ultra-violet (UV) emission ranging from 358 nim to 450 nm (maximum at 388 rim).

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