Functionalisation and Characterization of SBA-15 Nanostructured Silica Modified with 2-Benzothiazolethiol

2008 ◽  
Vol 587-588 ◽  
pp. 458-462 ◽  
Author(s):  
Ivana Cesarino ◽  
Éder T.G. Cavalheiro ◽  
Glimaldo Marino ◽  
Jivaldo R. Matos
Keyword(s):  
Electron Microscopy ◽  
Thermal Analysis ◽  
Silica Surface ◽  
Solid Phase ◽  
Organic Substances ◽  
Modified Silica ◽  
Covalently Bonded ◽  
Nanostructured Silica ◽  
Scanning Electron

Mesoporous silica can be modified and functionalised by immobilisation of organic substances covalently bonded to the silanol groups on the silica surface. This paper describes the modification of a SBA-15 nanostructured silica with 2-benzothiazolethiol. After derivatization the modified silica was chacacterized by elemental analysis, IR spectroscopy, thermal analysis (TG and DSC), NMR in solid phase and scanning electron microscopy.

Effect of Heat Treatments on Wettability of Nacre

2020 ◽  
Vol 985 ◽  
pp. 86-90
Author(s):  
Andi Muhammad Anshar ◽  
Sengo Kobayashi ◽  
Satoshi Okano
Keyword(s):  
Electron Microscopy ◽  
Thermal Analysis ◽  
Scanning Electron Microscopy ◽  
Heating Temperature ◽  
Pearl Oyster ◽  
Heat Treatments ◽  
Organic Substances ◽  
Water Contact ◽  
X Ray ◽  
Scanning Electron

The surface wettability of biomaterials influences on osteoblast behavior and bone formation. In this research, the variation of wettability of nacre by heat treatments was examined. Plates of the nacre were fabricated from shells of the Akoya pearl oyster. The specimens were heated at 100, 200, 300, 400, 500, and 600 °C. Characterizations of the specimens during and after heat treatments were carried out using scanning electron microscopy, X-ray diffractometry, and thermogravimetry-differential thermal analysis. The water contact angle (WCA) of the specimen was measured to evaluate wettability. The color of nacre changed from iridescent color to brownish weak-iridescence by the heating at and over 300 °C. The nacre heated at and over 300 °C became brittle because organic substances in nacre, which acts as the glue between the aragonite platelets were evaporated by the heating. The WCA of the specimen was decreased with increasing heating temperature, which should be related to the decrease in the number of organic substances in nacre by the heating.

Darstellung und Charakterisierung des Silber(I,II,III)-oxidclathrates Ag7O8HCO3 / Synthesis and Characterization of the Silver(I,II,III) Oxide Clathrate Ag7O8HCO3

2000 ◽  
Vol 55 (9) ◽  
pp. 882-886 ◽  
Author(s):  
Martin Jansen ◽  
Sascha Vensky
Keyword(s):  
Electron Microscopy ◽  
Thermal Analysis ◽  
Scanning Electron Microscopy ◽  
Magnetic Susceptibility ◽  
Solid State Nmr ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

The silver(I,II,III) oxide clathrate Ag7O8HCO3 was synthesized by anodic oxidation of silver(I) in a suspension of Ag2CO3 in an aqueous AgF solution. The title compound was characterized by single crystal X-ray diffraction (cubic, Fm3̄m, a = 9.8085(3) Å, Z = 4), scanning electron microscopy, thermal analysis, IR spectroscopy, 1H-solid state-NMR and measurement of the magnetic susceptibility

Synthesis and Characterization of Nanostructured TiO2-SnO2 Composite

2014 ◽  
Vol 975 ◽  
pp. 233-237
Author(s):  
Joelma C. S. Breve ◽  
Dayse I. dos Santos
Keyword(s):  
Electron Microscopy ◽  
Heat Treatment ◽  
Thermal Analysis ◽  
Gas Sensors ◽  
Catalytic Properties ◽  
Rutile Phase ◽  
Synthesis And Characterization ◽  
Vis Spectroscopy ◽  
Scanning Electron

Nanostructured composites based on titanium dioxide have been studied in order to improve optical and photo-catalytic properties, as well as their performance in gas sensors. In this work, titanium and tin dioxides were simultaneously synthesized by the polyol method resulting in TiO2 platelet coated with SnO2 nanoparticles as was observed by scanning electron microscopy. The thermal analysis showed that the combined synthesis promotes more easily the crystallization of the TiO2 rutile phase. The composite obtained after heat treatment at 500 °C showed to be formed of almost only rutile phases of both oxides. The optical properties analyzed by UV-Vis spectroscopy showed that the combined oxides have higher absorbance, which reinforces a model found in the literature based on the flow of photo-generated electrons to the conduction band of SnO2 delaying the recombination of charges.

scholarly journals CHEMICAL-MINERАLOGICAL CHARACTERIZATION OF BAUXITES FROM DIFFERENT DEPOSITS

2014 ◽  
Vol 5 (1) ◽  
Author(s):  
Gordana Оstojić ◽  
Dragica Lazić ◽  
Branko Škundrić ◽  
Jelena Penavin Škundrić ◽  
Slavica Sladojević ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Thermal Analysis ◽  
Raw Materials ◽  
Mineralogical Composition ◽  
Chemical Characteristics ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

From the aspect of their chemical and mineralogical composition, bauxites are very complex multicomponent raw materials. The paper presents the characterization of bauxite from several different deposits: Brazil, Milići, Čitluk and Kosovo. Chemical characteristics were determined by a combination of different analytical methods: gravimetry, potentiometric titration, atomic absorption spectroscopy (AAS) and UV-VIS spectrophotometry. Mineralogical composition was determined using X-ray diffraction and thermal analysis methods. Chemical and structural characterization is complemented by the results of scanning electron microscopy with EDX analysis. The information obtained was used for the assessment of the quality of investigated bauxites from the aspect of their application in the production of alumina.

Interface Reaction between Directional Solidified Superalloy DZ40M and Ceramic Mould

2021 ◽  
Vol 1035 ◽  
pp. 235-242
Author(s):  
Li Li Wang ◽  
Jian Sheng Yao ◽  
Guo Hong Gu ◽  
Xin Li ◽  
Shu Xin Niu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Thermal Analysis ◽  
Solid Solution ◽  
Interface Reaction ◽  
Ceramic Shell ◽  
Interface Characterization ◽  
The Core ◽  
Inner Surface ◽  
Scanning Electron

The interfaces between DZ40M directional solidified superalloy and ceramic mould (SiO2-base core and Al2O3-base shell) was studied by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results showed that there was a serious interface reaction between DZ40M and ceramic cores，which resulted in many reaction pits (~100μm deep), Si rich residue alloys and Zr rich subglobose oxides on the inner surface. And the interface reaction between DZ40M and ceramic shell induced a ~50μm of pink sand burning layer. The thermal analysis showed that the reactions between DZ40M and core or shell were similar: the active alloy constituents (Zr, Al, Ti and Cr) were oxidized and became oxides or solid solution with the core or shell components (SiO2, Al2O3 or Fe2O3), but the interface characterization of DZ40M/core and DZ40M/shell was different because the shell had the main content of Al2O3 and impurity of Fe2O3, while those of the core were SiO2 and CaO, respectively.

Preparation and Characterization of Fibri-Form Silica from Short Chrysotile Fibers by Mix-Roasting

2014 ◽  
Vol 809-810 ◽  
pp. 313-318
Author(s):  
Peng Cheng Song ◽  
Tong Jiang Peng ◽  
Hong Juan Sun ◽  
Yu Cao Yu
Keyword(s):  
Electron Microscopy ◽  
Thermal Analysis ◽  
Scanning Electron Microscopy ◽  
Fluorescence Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Fibrous Morphology ◽  
Ft Ir ◽  
Scanning Electron

Fibri-form silica was extracted from short chrysotile fibers by mix-roasting with ammonium bisulfate. The fibri-form silica were characterized by X-ray fluorescence analysis (XRF), X-ray diffraction (XRD), thermogravimetry and differential thermal analysis (TG-DTA), scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FT-IR) and N2 adsorption isotherms. The results show that the fibri-form silica with disordered crystalline structure, but also in fibrous morphology. The surface area and pore volume of fibri-form silica are 181.66 m2/ g and 0.44 cc/ g, respectively. The structure of fibri-form silica is stable, no phase transformed from 50 to 1200 oC.

Monocomponent Powders and Thin Films in the Binary System SiO2–TiO2

2007 ◽  
Vol 333 ◽  
pp. 289-292
Author(s):  
Măriuca Gartner ◽  
M. Crisan ◽  
L. Predoana ◽  
Maria Zaharescu ◽  
A. Barau ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Thermal Analysis ◽  
Preparation Method ◽  
Sol Gel ◽  
Dip Coating ◽  
Morphology And Structure ◽  
Alkoxide Route ◽  
Scanning Electron

In this work, we report the sol-gel alkoxide route preparation of nanostructured SiO2 and TiO2 powders as well as TiO2-SiO2 thin films obtained by dip-coating. Thermal analysis, morphology and structure were characterized for powders and correlation between preparation method and optical properties of binary materials (SiO2-TiO2) for thin films was approached. Spectroscopic Ellipsometry (SE), Fourier Transform Infrared Spectroscopy (FTIR) and scanning electron microscopy (SEM) have been used for the physical characterization of the films.

Application of solid-phase immune electron microscopy to study physical and stability characteristics of enterically transmitted non-a, non-b hepatitis virus

1988 ◽  
Vol 46 ◽  
pp. 80-81
Author(s):  
Charles D. Humphrey ◽  
E. H. Cook ◽  
Karen A. McCaustland ◽  
Daniel W. Bradley
Keyword(s):  
Electron Microscopy ◽  
Hepatitis A ◽  
Hepatitis A Virus ◽  
Solid Phase ◽  
Etiologic Agent ◽  
World Health ◽  
Health Concern ◽  
Morphological Identification ◽  
Immune Electron Microscopy

Enterically transmitted non-A, non-B hepatitis (ET-NANBH) is a type of hepatitis which is increasingly becoming a significant world health concern. As with hepatitis A virus (HAV), spread is by the fecal-oral mode of transmission. Until recently, the etiologic agent had not been isolated and identified. We have succeeded in the isolation and preliminary characterization of this virus and demonstrating that this agent can cause hepatic disease and seroconversion in experimental primates. Our characterization of this virus was facilitated by immune (IEM) and solid phase immune electron microscopic (SPIEM) methodologies.Many immune electron microscopy methodologies have been used for morphological identification and characterization of viruses. We have previously reported a highly effective solid phase immune electron microscopy procedure which facilitated identification of hepatitis A virus (HAV) in crude cell culture extracts. More recently we have reported utilization of the method for identification of an etiologic agent responsible for (ET-NANBH).

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