scholarly journals Application of X‐ray diffraction and energy dispersive spectroscopy in the isolation of sulfated polysaccharide from Porphyra haitanensis and its antioxidant capacity under in vitro digestion

2021 ◽  
Author(s):  
Peilin Chen ◽  
Yanhong Xu ◽  
Shuqi Yang ◽  
Qing Chang ◽  
Baodong Zheng ◽  
...  
Keyword(s):  
Antioxidant Capacity ◽  
Energy Dispersive Spectroscopy ◽  
In Vitro Digestion ◽  
Sulfated Polysaccharide ◽  
Energy Dispersive ◽  
X Ray Diffraction ◽  
X Ray ◽  
Porphyra Haitanensis

Composition Analysis of Ge/Si1-xGex: C Buffer on Silicon Measured by Planar Scanning Energy Dispersive Spectroscopy

2011 ◽  
Vol 383-390 ◽  
pp. 7619-7623
Author(s):  
Z Z Lu ◽  
F. Yu ◽  
L. Yu ◽  
L. H. Cheng ◽  
P. Han
Keyword(s):  
Energy Dispersive Spectroscopy ◽  
Chemical Vapor ◽  
Energy Dispersive ◽  
Composition Analysis ◽  
X Ray Diffraction ◽  
Si Substrate ◽  
Composition Distribution ◽  
X Ray ◽  
Cvd Method ◽  
Substrate Structure

In this work, Si, Ge element composition distribution in Ge /Si1-xGex:C /Si substrate structure has been characterized and modified by planar scanning energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). The Ge /Si1-xGex:C /Si substrate samples are grown by chemical vapor deposition (CVD) method. The accuracy of EDS value can be improved by ~ 32%. And the modified EDS results indicate the Ge distribution in the Ge/Si1-xGex:C/Si sub structure.

scholarly journals Karakterisasi Membran ZSM-5 yang Disintensis dengan Variasi Jenis dan Ukuran Kasa Penyangga

2020 ◽  
Vol 16 (1) ◽  
pp. 1
Author(s):  
Ana Hidayati Mukaromah ◽  
Tulus Ariyadi ◽  
Inas Hasna Azizah ◽  
Mifbakhuddin Mifbakhuddin
Keyword(s):  
Fourier Transform ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Energy Dispersive Spectroscopy ◽  
Energy Dispersive ◽  
X Ray Diffraction ◽  
X Ray ◽  
Aisi 316 ◽  
Scanning Electron

<p>Telah dilakukan sintesis dan karakterisasi membran ZSM-5 dengan penyangga kasa jenis 304 ukuran 200 dan 400 mesh dan jenis kasa AISI 316 ukuran 180 mesh. Tujuan penelitian ini adalah mensintesis membran ZSM-5 dengan penyangga kasa jenis 304 ukuran 200 dan 400 mesh dan jenis kasa AISI 316 ukuran 180 mesh dan mengkarakterisasi membran ZSM-5 hasil sintesis. Sintesis membran dilakukan dengan cara melapiskan prekursor ZSM-5 (<em>coating)</em> pada penyangga kasa yang telah diberi perlakuan dan dipanaskan pada suhu 90 °C selama 4 hari. Selanjutnya, membran yang dihasilkan dikarakterisasi engan metoda <em>X-ray diffraction</em> (XRD), <em>scanning electron microscope-energy dispersive spectroscopy</em> (SEM-EDS) dan <em>Fourier-transform infrared</em> (FTIR). Hasil citra SEM-EDS menunjukkan bahwa ukuran membran ZSM-5 yang semakin besar, menghasilkan jumlah lubang atau pori semakin banyak dengan luasan pori yang semakin kecil. Pola difraksi XRD menunjukkan bahwa membran yang dihasilkan mempunyai intensitas tertinggi pada 2 8º dan 23º yang merupakan karakteristik dari ZSM-5. Hasil spektra FTIR menunjukkan adanya serapan pada bilangan gelombang 450 cm<sup>-</sup><sup>1</sup>yang merupakan ciri khas membran ZSM-5.</p><p class="Text"><strong>Characterization of ZSM-5 Membranes Synthesized by Variation of Support Types and Sizes.</strong> Synthesis and characterization of ZSM-5 membrane were carried out with 304 type 200 and 400 mesh gauze supports and 180 mesh AISI 316 gauze types. The purpose of this study was to synthesize ZSM-5 membrane with 304 type 200 and 400 mesh gauze support and AISI 316 type 180 mesh size 180 mesh and characterize the synthesized ZSM-5 membrane. Membrane synthesis was carried out by coating the pre-treated gauze support with the ZSM-5 precursor and was heated at 90 °C for 4 days. Furthermore, the resulting membrane was characterized by X-ray diffraction (XRD), scanning electron microscope-energy dispersive spectroscopy (SEM-EDS) dan Fourier-transform infrared (FTIR). The SEM-EDX analysis shows that the increasing of ZSM-5 membrane size allowed pores number to increase with smaller pore surface area. The X-ray Diffraction pattern (XRD) shows that the resulting membrane has the highest intensity at 2  of 8º and 23º as the characteristics of ZSM-5. The FTIR spectra results show absorption at wavenumbers 450 cm<sup>-1</sup> which is a characteristic of ZSM-5 membranes.</p>

scholarly journals Bio-Based Nanoparticles as a Carrier of β-Carotene: Production, Characterisation and In Vitro Gastrointestinal Digestion

Molecules ◽  
2020 ◽  
Vol 25 (19) ◽  
pp. 4497
Author(s):  
Beatriz S. Afonso ◽  
Ana G. Azevedo ◽  
Catarina Gonçalves ◽  
Isabel R. Amado ◽  
Eugénio C. Ferreira ◽  
...  
Keyword(s):  
Encapsulation Efficiency ◽  
In Vitro Digestion ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Mean Size ◽  
Average Size ◽  
Size Controlled ◽  
Β Carotene

β-carotene loaded bio-based nanoparticles (NPs) were produced by the solvent-displacement method using two polymers: zein and ethylcellulose. The production of NPs was optimised through an experimental design and characterised in terms of average size and polydispersity index. The processing conditions that allowed to obtain NPs (<100 nm) were used for β-carotene encapsulation. Then β-carotene loaded NPs were characterised in terms of zeta potential and encapsulation efficiency. Transmission electron microscopy, Fourier transform infrared spectroscopy and X-ray diffraction analysis were performed for further morphological and chemical characterisation. In the end, a static in vitro digestion following the INFOGEST protocol was performed and the bioaccessibility of β-carotene encapsulated in both NPs was determined. Results show that the best conditions for a size-controlled production with a narrow size distribution are lower polymer concentrations and higher antisolvent concentrations. The encapsulation of β-carotene in ethylcellulose NPs resulted in nanoparticles with a mean average size of 60 ± 9 nm and encapsulation efficiency of 74 ± 2%. β-carotene loaded zein-based NPs resulted in a mean size of 83 ± 8 nm and encapsulation efficiency of 93 ± 4%. Results obtained from the in vitro digestion showed that β-carotene bioaccessibility when encapsulated in zein NPs is 37 ± 1%, which is higher than the value of 8.3 ± 0.1% obtained for the ethylcellulose NPs.

Study on the Mechanism of Magnesium Sulfate to Cement and C-S-H Gel

2011 ◽  
Vol 243-249 ◽  
pp. 4687-4690 ◽  
Author(s):  
Xiu Juan Li
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Magnesium Sulfate ◽  
Energy Dispersive Spectroscopy ◽  
Concrete Strength ◽  
Energy Dispersive ◽  
Test Block ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

The microstructure of cement test block and the C-S-H gel attacked by magnesium sulfate is observed by means of scanning electron microscopy(SEM), energy dispersive spectroscopy(EDS)and X-ray diffraction(XRD).It is found that the presence of Mg2+ makes C-S-H gel decalcify, dissolve and decompose, which thereby increasing the erosion of SO42- on the concrete. The decomposition of C-S-H and the generation of M-S-H result in the loss of concrete strength and the ultimate destruction of concrete.

Structural effect of the SC-AF transition in BSCYCO system

1992 ◽  
Vol 50 (1) ◽  
pp. 84-85
Author(s):  
Shulin Wen ◽  
Chenyu Song ◽  
J.A. Eades
Keyword(s):  
Electron Diffraction ◽  
Structural Transformation ◽  
Energy Dispersive Spectroscopy ◽  
Hole Concentration ◽  
Analytical Data ◽  
Structural Effect ◽  
Energy Dispersive ◽  
X Ray Diffraction ◽  
Sharp Drop ◽  
X Ray

The transition between the SC (superconductor) and the AF (antiferromagnetic semiconductor) has been investigated in the BSCYCO (Bi2Sr2Ca1-xYxCu2O8+Y) system. During the investigation a tetragonal(T)-orthorhombic(O) structural transformation accompanied by a sharp drop in Tc around at Xc=0.4 has been observed.Some of previous studies on BSCYCO revealed the transition from the SC to the AF around at x=0.5, and interpreted it as a result of a decreasing hole concentration, We have also studied the SC-AF transition of BSCYCO with analytical data combination from not only Tc measurements, but also X-ray diffraction, electron diffraction and energy dispersive spectroscopy (EDS) results. We found that a structural transformation from the tetragonal(T) to the orthorhombic(O) system would be mainly responsible for the SC-AF transition.

Micro-hardness evaluation for surface alloying of H11 die steel with Cu–Cr–Ni powder metallurgy tool in electrical discharge machining

2016 ◽  
Vol 232 (3) ◽  
pp. 438-450 ◽  
Author(s):  
Amoljit Singh Gill ◽  
Sanjeev Kumar
Keyword(s):  
Powder Metallurgy ◽  
Energy Dispersive Spectroscopy ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Energy Dispersive ◽  
Tool Electrode ◽  
Surface Alloying ◽  
Micro Hardness ◽  
X Ray Diffraction ◽  
X Ray

Electrical discharge machining is a non-conventional material removal process; recently, efforts have been made to use it as a surface alloying/modifying method. This study investigates and compares the micro-hardness of the surface machined by electrical discharge machining process using composite tool electrode (copper–chromium–nickel) manufactured by powder metallurgy and conventional copper tool. Design of experiment is used to find the best level of process parameters in order to achieve high micro-hardness. The machined surfaces are subsequently analyzed using different techniques like scanning electron microscopy, X-ray diffraction and energy-dispersive spectroscopy to ascertain the surface characteristics. Results indicate that the micro-hardness of the alloyed surface formed by powder metallurgy tool electrode is improved by 96.3% as compared to base material and 65.7% as compared to the surface machined by conventional copper electrode. Energy-dispersive spectroscopy of the surface machined using powder metallurgy electrode confirms significant material migration from tool and dielectric to the machined surface. The X-ray diffraction shows the formation of cementite (Fe3C), intermetallic compound of iron, chromium and nickel (FeCrNi) and chromium carbide (Cr7C3) on the surface machined using powder metallurgy electrode.

Preparation of Magnetic Fe3O4 Nanoparticles by Microbial Reduction Combining Natural Oxidation Method

2011 ◽  
Vol 399-401 ◽  
pp. 949-953 ◽  
Author(s):  
Zhan Guo Liang ◽  
Jun Mu ◽  
Ji Cheng Shi
Keyword(s):  
Energy Dispersive Spectroscopy ◽  
Microbial Reduction ◽  
Energy Dispersive ◽  
Air Oxidation ◽  
X Ray Diffraction ◽  
Oxidation Condition ◽  
Oxidation Method ◽  
X Ray ◽  
Sulfate Reducing ◽  
Size And Morphology

By using microbial reduction combining natural oxidation method, magnetic Fe3O4nanoparticles have been synthesized. Sulfate-reducing bacterium(SRB) was used to reduce ferric sulfate to produce ferric sulfide, then ferric sulfide was oxidized to iron protoxide and ferroferric oxide in the end under natural air oxidation condition. The size and morphology of the product and SRB was examined by scanning electron microscopy(SEM), the microstructure were investigated by X-ray diffraction(XRD) and energy dispersive spectroscopy(EDS). There are only two components(xFeO and yFe3O4)which is testified by XRD and EDS. The constituents of product were analysed by using energy dispersive spectroscopy(EDS). In result, x,y actual numerical value which is respectively mole fraction of FeO and Fe3O4in the product is figured out 0.678 and 0.322.

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