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Issue Info: 
  • Year: 

    2021
  • Volume: 

    9
  • Issue: 

    2 (34)
  • Pages: 

    46-52
Measures: 
  • Citations: 

    0
  • Views: 

    404
  • Downloads: 

    0
Abstract: 

Due to the increasing development of one, two and three dimensional methods of nuclear magnetic resonance in recent years and the need to develop new research and applications of this device in the country, this article attempts to introduce new applications in this field. The applications of this technique in the fields of medicine and food industry and solid state and recent device developments in this field are briefly introduced.

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Issue Info: 
  • Year: 

    2013
  • Volume: 

    2
  • Issue: 

    4
  • Pages: 

    505-508
Measures: 
  • Citations: 

    0
  • Views: 

    339
  • Downloads: 

    91
Abstract: 

In this paper, CuO nanoparticles have been synthesized via solidstate thermal decomposition using copper(II) Schiff base complexes as new precursors at 6000C under air atmosphere for 3 h. Surface morphology of the products were characterized by Fourier transform  infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and scanning electron microscopy (SEM).

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Issue Info: 
  • Year: 

    2014
  • Volume: 

    16
Measures: 
  • Views: 

    167
  • Downloads: 

    52
Keywords: 
Abstract: 

BISMUTH BASED PHOTO CATALYSTS SPECIALLY BISMUTH OX YHALIDES HAVE ATTRACTED A GREAT AMOUNT OF ATTENTION IN THE RECENT YEARS. IN THIS RESEARCH, BI2.92O1.98BR NANO FLAKES HAVE BEEN SYNTHESIZED VIA A GREEN CHEMISTRY METHOD STARTING FROM BISMUTH NITRATE PENT AHYDRATE AND POTASSIUM BROMIDE. BALL MILLING FOR 30 MINUTES GAVE BISMUTH OX YBROMIDE NANO FLAKES WITH THE THICKNESS OF ABOUT 27 NANOMETERS, GROWN AS LAYERS BESIDE EACH OTHER, WITH DIFFERENT LATERAL SIZES FROM NANO TO MICRO RANGES AS SHOWN IN FIG.1. IN ENERGY DISPERSIVE X-RAY ANALYSIS, ONLY BI, O, AND BR WERE DETECTED AND THE ATOM RATIO OF BI: O: BR =20.45:63.94:14.06 WAS OBSERVED. IN THE FOURIER TRANSFORM INFRARED SPECTRUM, THE PEAK AT 567 CM-1 WAS ATTRIBUTED TO THE STRETCHING VIBRATION OF BI-O. THE PEAKS AT 1348-1461 CM-1 WERE ASSIGNED TO THE STRETCHING VIBRATIONS OF C-O AND C=O WHICH WERE RESULTED FROM THE SURFACE FUNCTIONAL GROUPS ON THE BI2.92O1.98BR MOLECULE. HYDROXYL GROUPS OF ADSORBED WATER MOLECULES SHOWED THEIR CHARACTERISTIC PEAK AT ABOUT 3533 CM-1. UV-VIS DIFFUSE REFLECTANCE SPECTRUM (DRS) ANALYSIS REVEALED BI2.92O1.98BR HAS AN ABSORPTION EDGE TO ABOUT 422 NM AND THE BAND GAP ENERGY WAS ESTIMATED TO BE 3.15 EV [1-3].

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Issue Info: 
  • Year: 

    2023
  • Volume: 

    14
  • Issue: 

    51
  • Pages: 

    1-16
Measures: 
  • Citations: 

    0
  • Views: 

    71
  • Downloads: 

    0
Abstract: 

Introduction: : The purpose of this research is solid state recycling of 3000 and 5000 series aluminum alloy scrap to produce aluminum nano-crystalline powder by mechanical milling without using process controlling agent. In this regard, aluminum used beverage cans (UBCs) which consist of lid (alloy 5182) and the monolith part (alloy 3004) of the body (thin) and bottom (thicker). Methods: To achieve disintegration mechanism, lid part, body and bottom of monolith part are separated each other because of diverse constituent of Al series and different thickness. The three parts individually were decoated then cut into the small chips (app. 8 mm). The chips were mechanically ball milled at different times up to 104 hours under argon atmosphere. The ratio of ball to powder was 10 to 1. Findings: The lid part chips are crushed faster than the monolith part chips, and, resulting in a finer powder. According to the PSA results, the D90 of the lid powder is less than 150 micrometers,while D90 of the body and bottom powders are more than 150 micrometers. This result can be used on an industrial scale to separate the constituent elements of crushed UBCs from each other. The smallest D90 values of lid, body and bottom powders, which obtained after 72, 80 and 80 h as optimum milling time, are 109, 258 and 391, respectively. Also, their flowability were 57. 8, 59. 3 and 61. 1 s/50 g, as well as the apparent density were 1. 38, 1. 43 and 1. 46 g/cm3, respectively.

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Issue Info: 
  • Year: 

    2005
  • Volume: 

    4
Measures: 
  • Views: 

    224
  • Downloads: 

    57
Abstract: 

 In this research the production of citric acid by solid state cultivation has been investigated. Apple residue as substrate and Asperiginase Nicher PTCC 5010 were selected. The effects of temperature, moisture, substrate particle size, nitrogen and carbon sources based on reminded glucose have been studied. In this experiment, the acid production increased from 27 gram (per one kilogram apple residue) to 127 gram. The results clearly proved optimization and development of citric acid production in comparison with pervious processes.

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Issue Info: 
  • Year: 

    2012
  • Volume: 

    1
  • Issue: 

    2
  • Pages: 

    153-158
Measures: 
  • Citations: 

    0
  • Views: 

    696
  • Downloads: 

    119
Abstract: 

CaCO3 nanoparticles have been synthesized via heat-treatment of a new precursor and solid state reaction. Effect of calcinations temperature and quantity of surfactant on particle size has been investigated. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Fourier transform infrared (FT–IR) spectroscopy.

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Issue Info: 
  • Year: 

    2023
  • Volume: 

    3
  • Issue: 

    4
  • Pages: 

    268-283
Measures: 
  • Citations: 

    0
  • Views: 

    38
  • Downloads: 

    36
Abstract: 

This study used sol-gel and hydrothermal methods to prepare binary bioactive glasses (BG) of SiO2-CaO with 63% and 37% molar fractions, respectively. Different techniques characterized heat-treated powders: Thermogravimetric analysis (TGA), Fourier-transformed infrared spectroscopy (FTIR), X-ray diffraction (XRD) analysis, inductively coupled plasma-atomic emission analysis (ICP-AES), solid-state nuclear magnetic resonance (NMR), scanning electron microscopy and energy dispersive spectroscopy (SEM-EDS), and Brunauer-Emmett-Teller analysis (BET). According to both synthetic routes, the HT technique presented better new apatite layers deposition on BG particles during in vitro bioactivity assessment in simulated body fluid (SBF). The bioactivity is confirmed by XRD analysis, NMR spectroscopy, and BET analysis showing that HT-derived bioactive glass (BG-HT) presents higher bioactivity than sol-gel-derived BG (BG-SG), and the nanometric particle size of HT-BG (90-100 nm) with a high specific surface area is responsible for this enhancement. Furthermore, NMR spectroscopy indicates the higher network connectivity of HT-derived bioactive glass due to different environments in this structure. Moreover, SEM-EDS micrographs of BG-HT glasses show spherical nanoparticles, while BG-SG results present a mixture of spherical and rod-like microparticles. The HT-BG could be a promising material for biomedical applications, especially in drug delivery and ion release.

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Issue Info: 
  • Year: 

    2002
  • Volume: 

    8
  • Issue: 

    -
  • Pages: 

    183-225
Measures: 
  • Citations: 

    1
  • Views: 

    89
  • Downloads: 

    0
Keywords: 
Abstract: 

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2020
  • Volume: 

    27
  • Issue: 

    4
  • Pages: 

    967-974
Measures: 
  • Citations: 

    0
  • Views: 

    402
  • Downloads: 

    0
Abstract: 

Yttrium calcium borate Y2CaB10O19 (YCB) compound is a new member of Rare Earth Borate compounds with nonlinear optical application. In the present research, the synthesis of YCB compound was investigated by using solid-state reaction method. Instead of usual preliminary and secondary thermal treatments, a single stage thermal process was developed. This new method is particularly important in terms of reducing the time and cost of synthesis. The structure of produced powder was analyzed by X-Ray diffraction and the powder x-ray data were also investigated by FullProf program. This Rietveld analysis confirmed the Hexagonal structure and P63/m space group, The bond angles were also reported. The anionic group and bond formation were studied using Raman spectroscopy. The results confirm both BO3 and BO4 formation. The Field emission scanning electron microscopy was carried out to study the morphology of the optimum sample.

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Author(s): 

Issue Info: 
  • Year: 

    2022
  • Volume: 

    48
  • Issue: 

    22
  • Pages: 

    0-0
Measures: 
  • Citations: 

    1
  • Views: 

    19
  • Downloads: 

    0
Keywords: 
Abstract: 

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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