scholarly journals Microwave-Assisted Sol–Gel Preparation of the Nanostructured Magnetic System for Solid-Phase Synthesis

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3176
Author(s):  
Daniela Istrati ◽  
Alina Moroșan ◽  
Raluca Stan ◽  
Bogdan Ștefan Vasile ◽  
Gabriel Vasilievici ◽  
...  
Keyword(s):  
Magnetite Nanoparticles ◽  
Solid Phase ◽  
Sol Gel ◽  
Synthesis Method ◽  
Advanced Characterization ◽  
Solid Support ◽  
Peptide Sequence ◽  
Precipitation Method ◽  
Characterization Methods ◽  
Microwave Assisted

This work describes a new synthesis method for core–shell magnetite nanoparticles with a secondary silica shell, functionalized with a linker system (Fe3O4-PABA-SiO2-linker) using a microwave-assisted heating technique. The functionalized solid nanomaterial was used for the nanophase synthesis of peptides (Fmoc route) as a solid support. The co-precipitation method was selected to obtain magnetite nanoparticles and sol–gel technique for silica coating using a microwave-assisted (MW) procedure. The magnetic properties of the nanoparticle core offer the advantage of a quick and easy alternative for the magnetic separation of the product from the reaction mixture, facilitating all the intermediary washing and separation operations. The intermediate and final materials were analyzed by advanced characterization methods. The effectiveness of the nanophase peptide synthesis using this nanostructured material as solid support was demonstrated for a short peptide sequence.

scholarly journals DETERMINATION OF THE SIZES OF PARTICLES OF SUPERCONDUCTING CUPRATE Y3Ba5Cu8OX BY MEANS OF DIFFERENT METHODS

2020 ◽  
Vol 4 ◽  
pp. 10-13
Author(s):  
Anastasiia Bolotnikova
Keyword(s):  
Particle Size ◽  
Size Structure ◽  
Solid Phase ◽  
Sol Gel ◽  
Synthesis Method ◽  
Precipitation Method ◽  
Phase Method ◽  
Synthesis Methods ◽  
Scherrer Formula ◽  
Co Precipitation

The superconducting cuprate Y3Ba5Cu8Ox was obtained with the help of sol-gel technology (sample C), co-precipitation of hydroxocarbonates (sample B) and solid-phase synthesis methods (A). Based on the results of scanning electron microscopy and methods based on the analysis of X-ray diffraction data: the Williamson-Hall construction and the Scherrer formula, features of the microstructure of the synthesized samples are established. The smallest particle size has a sample that has been synthesized by the sol-gel method. The tendency to aggregation and sedimentation for this sample is the smallest. The sample obtained by the co-precipitation method has larger grains and a higher tendency to aggregate. The size of the microparticles and the tendency to aggregate for the sample synthesized by the solid-phase method are greatest. The morphology of particles was studied using three methods: SEM, Scherrer and Williamson-Hall formulas and the following results were found: particle size depends on the synthesis method, but a relatively narrow size distribution within one synthesis method remains, the value of crystal lattice microdeformation for samples increases in a line: C sample– A sample– B sample. Thus, the work was carried out for determining the size, structure and morphology of superconducting phases. It expands knowledge in the field of research of superconducting compounds

scholarly journals SYNTHESIS OF ZnO-Аg NANOPARTICLES BY SOL-GEL METHOD

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Savka Janković ◽  
Dragana Milisavić ◽  
Tanja Okolić ◽  
Dijana Jelić
Keyword(s):  
Zno Nanoparticles ◽  
Wide Spectrum ◽  
Sol Gel ◽  
Synthesis Method ◽  
Material Surface ◽  
Characterization Methods ◽  
Gel Method ◽  
X Ray ◽  
Sol Gel Method ◽  
Doped Zno

Zinc oxide is a highly applicable semiconductor material. Wide applica-tion of this nanomaterial is connected to wide spectrum of energy band gap, high bond en-ergy, great thermal conductivity, but also with its non-toxicity, antibacterial activity, bio-compatibility and biodegradability characteristics. The aim of this paper is synthesis and characterization of silver doped ZnO nanoparticles (ZnO:Ag NP) using sol-gel method. Ob-tained samples of silver doped ZnO nanoparticles were characterized by following tech-niques: Fourier-transform infrared spectroscopy (FTIR), UV/VIS spectrophotometry, X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spec-troscopy (EDX). Efficiency of provided synthesis method was examined by FTIR spectros-copy. XRD determined the purity and crystallinity, and wurtzite structure of synthesized material. Surface morphology and the effect of doping were examined using SEM and EDX characterization methods. Results showed better conductivity after doping ZnO nanoparti-cles with silver. SEM micrographs showed ZnO:Ag NP in the form of nanorods with a par-ticle average size of 6 nm.

scholarly journals Synthesis and Characterization of TiO2 Nanoparticles for Solar Cell Applications

2019 ◽  
Vol 8 (9) ◽  
pp. 2462-2465
Keyword(s):  
Solar Cell ◽  
Tio2 Nanoparticles ◽  
Sol Gel ◽  
Synthesis Method ◽  
Pollutant Removal ◽  
Precipitation Method ◽  
Micro Particles ◽  
Wide Range ◽  
Titanium Tetra Isopropoxide ◽  
Co Precipitation

Titanium dioxide (TiO2 ) nanoparticles were synthesized using three different approaches successfully. These approaches were adopted as per different applications of TiO2 nanoparticles. These samples were characterized using X- ray diffraction (XRD) technique. XRD revealed nanocrystalline regime of TiO2 nanoparticles in each approach. The calculated size of nanoparticle was less than 11 nm in the used chemical approaches. Prominent and broad peaks were observed in XRD pattern for all samples, which showed all samples were in nanocrytalline form. The particle size was calculated for first three most intense prominent XRD peaks. By adopting sol gel method using Titanium tetra isopropoxide (TTIP) as precursor, the synthesized Titania particles were pure anatas and of size 7 to 11nm and using co-precipitation method using TiCl3 as precursor synthesized Titania were pure rutile and of size 3 to 7 nm. The co-precipitation method has been best suited for getting smaller nanoparticles. It was also observed that Solid state mechanical reduction root can be used to reduce the size of Titania micro-particles up to about 60 nm but phase of nanoparticles remains same as starting microparticles. It has been seen that the material properties of TiO2 can be tuned by proper method of synthesis. The work may play important role to choose particular synthesis method for specific application. These nano synthesized TiO2 materials may be used in a wide range of applications such as dye sensitized solar cell, photocatalysis, antibacterial, environment pollutant removal and photoactivated self cleaning properties etc

Preparation of complex oxide (Pr0.8Y0.2)0.6Ca0.4CoO3 from Pr–Y–Ca–Co gel synthesized by ultrasonic irradiation and its metal-insulator transition characteristics

2021 ◽  
Author(s):  
masahiro tahashi ◽  
Akikazu Nanbu ◽  
Hiroyuki Yamada ◽  
Makoto Takahashi ◽  
Hideo Goto ◽  
...  
Keyword(s):  
Ultrasonic Irradiation ◽  
Solid Phase ◽  
Sol Gel ◽  
Synthesis Method ◽  
Complex Oxide ◽  
Solid Phase Reaction ◽  
Phase Reaction ◽  
Metal Insulator ◽  
Good Crystallinity ◽  
Poorly Soluble

Abstract We previously reported that a swollen gel possessing a uniform composition and prolonged stability can be conveniently prepared by simple ultrasonic irradiation of an ethanol suspension of calcium acetate, which is poorly soluble in ethanol. In this study, the same gel synthesis method was applied to prepare the multicomponent oxide (Pr1−yYy)1−xCaxCoO3 (PYCCO), which undergoes a metal-insulator phase transition. Calcination of the Pr–Y–Ca–Co swollen gel at 800 °C for 12 h in air afforded PYCCO nanoparticles with good crystallinity, representing a faster and more convenient route compared with conventional solid-phase reaction methods or sol–gel methods.

scholarly journals A Review on Luminescent Rare Earth Complexes

2021 ◽  
pp. 69-77
Author(s):  
Qiuxin ShenQiuxin Shen ◽  
Liting Xu ◽  
Yiyan Jiang ◽  
Yiping Zhang
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Solid Phase ◽  
Synthesis Method ◽  
Rare Earth Complexes ◽  
Precipitation Method ◽  
Future Research ◽  
Phase Method ◽  
Synthesis Methods ◽  
Starting Point

At present, rare earth elements are widely used in various industries. In this paper, luminescent rare earth complexes are taken as a starting point to explore the luminescence principles of several important rare earth elements. The commonly used synthesis methods of luminescent rare earth complexes in recent year are also summarized, mainly including co-precipitation method, high temperature solid phase method, sol-gel method and hydrothermal synthesis method. And prospects for the future research on luminescent rare earth complexes are made.

Microwave assisted solid-phase synthesis of substituted tetraazaporphyrins and a phthalocyanine-peptide conjugate

2010 ◽  
Vol 14 (10) ◽  
pp. 891-903 ◽  
Author(s):  
Mercy Mudyiwa ◽  
Margaret W. Ndinguri ◽  
Steven A. Soper ◽  
Robert P. Hammer
Keyword(s):  
Solid Phase Synthesis ◽  
Solid Phase ◽  
Synthesis Method ◽  
Reaction Times ◽  
Solid Support ◽  
Phase Synthesis ◽  
Covalently Bonded ◽  
Poly Ethylene ◽  
High Degree ◽  
Acid Labile

Various asymmetrically substituted phthalocyanines (Pcs) and porphyrazines (Pzs) have been synthesized in good yields using a solid-phase synthesis method with a poly(ethylene glycol) (PEG) resin attached to an indole linker as the solid support. These compounds are formed by cross condensation of maleonitrile or phthalonitrile with another phthalonitrile covalently bonded to the solid support with an amino linking group. The polymer bound Pc or Pz is separated by filtration, and washing the symmetrical Pc or Pz by-product. The amine Pc -appended to polyethylene glycol resin is further reacted to yield azide whilst still on the solid support. Cleavage of the Pc or Pz off the solid support results in 3:1 asymmetric Pz or Pz with high degree of purity, requiring minimal further purification. The use of hydrophilic PEG-based resin allows the symmetrical compound to be removed completely by washing whereas the acid labile indole linker makes it easier to cleave the product under mild conditions. The conjugation abilities of these compounds have been demonstrated by the successful conjugation of one of the azide Pcs with a peptide elaborated with an alkyne function. Use of microwave for the synthesis of these compounds results in shorter reaction times, higher yields and higher degree of purity.

A review of methods for synthesis of nanostructured metals with emphasis on iron compounds

2007 ◽  
Vol 61 (3) ◽  
Author(s):  
A. Tavakoli ◽  
M. Sohrabi ◽  
A. Kargari
Keyword(s):  
Metal Nanoparticles ◽  
Solid Phase ◽  
Arc Discharge ◽  
Hydrogen Plasma ◽  
Sol Gel ◽  
Synthesis Method ◽  
Chemical Vapor ◽  
Research Area ◽  
Vapor Condensation ◽  
Advantages And Disadvantages

AbstractSynthesis of metal nanoparticles with specific properties is a newly established research area attracting a great deal of attention. Several methods have been put forward for synthesis of these materials, namely chemical vapor condensation, arc discharge, hydrogen plasma—metal reaction, and laser pyrolysis in the vapor phase, microemulsion, hydrothermal, sol-gel, sonochemical, and microbial processes taking place in the liquid phase, and ball milling carried out in the solid phase.The properties of metal nanoparticles depend largely on their synthesis procedures. In this paper the fundamentals, advantages, and disadvantages of each synthesis method are discussed.

Electrochemical Capacitive Properties of CuO Nanorods Prepared by a Facile Microwave-Assisted Synthesis Method

2020 ◽  
Vol 62 ◽  
pp. 21-30
Author(s):  
Wei Li ◽  
Na Na Feng
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Synthesis Method ◽  
Precipitation Method ◽  
Microwave Assisted Synthesis ◽  
X Ray ◽  
Microwave Assisted ◽  
Capacitance Performance ◽  
Capacitive Properties ◽  
Cuo Nanorods

CuO nanorods were fabricated by a facile microwave-assisted synthesis method and applied to pseudo-capacitor. The CuO nanorods were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The capacitive behavior of nanorods was investigated by cyclic voltammetry and galvanostatic charge–discharge measurements. Electrochemical experiments reveal that CuO nanorods demonstrate better capacitance performance than granular CuOs prepared by chemical precipitation method. The CuO nanorods have a high specific capacitance of 317 F/g at a current density of 1 A/g and a fairly good cyclic stability.

Sign in / Sign up

Export Citation Format

Share Document