scholarly journals Metal-Containing Zinc Phosphate EDI Zeolites Synthesized by Sol–gel Assisted Hydrothermal Method

Minerals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 391
Author(s):  
Xuelei Wang ◽  
Zhaojun Dong ◽  
Qiufeng Wang ◽  
Chao Meng ◽  
Weibin Zhuang ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Molecular Sieves ◽  
Zinc Phosphate ◽  
Variable Temperature ◽  
Sol Gel ◽  
Synthesis Temperature ◽  
Powder Samples ◽  
Icp Analysis ◽  
Temperature Susceptibility ◽  
Crystalline Metal

Three different metal-containing zinc phosphate, [C3H12N2][Zn0.5Fe1.5(PO4)2] (1), [C3H12N2][Zn0.67Co1.33(PO4)2] (2) and [C3H12N2][Zn0.67Ni1.33(PO4)2] (3) with EDI topology were prepared by sol–gel assisted hydrothermal method. The advantages of this method are lower synthesis temperature and uniform mixing. The crystalline metal-containing zinc phosphate zeolites exhibit a variety of SEM morphologies because of the entanglement of three different metal ions. The zinc ions in the zinc phosphate EDI molecular sieve were partially substituted by Fe, Co and Ni ions. The ICP analysis shows that the metal ratios of Zn/M are 1/3, 1/2 and 1/2. Variable temperature susceptibility was measured on powder samples in the range 2–300 K. All three M-EDI molecular sieves exhibit antiferromagnetic properties. In addition, they were analyzed by XRD, CHN, IR and TG.

Studies of Fe-doped SiO2/TiO2 composite nanoparticles prepared by sol-gel-hydrothermal method

2005 ◽  
Vol 40 (15) ◽  
pp. 3939-3943 ◽  
Author(s):  
Zhijie Li ◽  
Bo Hou ◽  
Yao Xu ◽  
Dong Wu ◽  
Yuhan Sun
Keyword(s):  
Hydrothermal Method ◽  
Sol Gel ◽  
Composite Nanoparticles

Synthesis of (K0.5Bi0.5)0.4Ba0.6TiO3 nanowires and ceramics by sol-gel–hydrothermal method

2006 ◽  
Vol 89 (24) ◽  
pp. 243114 ◽  
Author(s):  
Yudong Hou ◽  
Lei Hou ◽  
Mankang Zhu ◽  
Hui Yan
Keyword(s):  
Hydrothermal Method ◽  
Sol Gel

Hydrothermal Synthesis of Bi1.5ZnNb1.5O7 Nanopowders

2007 ◽  
Vol 561-565 ◽  
pp. 495-498 ◽  
Author(s):  
Jin Liang Huang ◽  
Xiao Wang ◽  
Liu Shuan Yang ◽  
Chun Wei Cui ◽  
Xing Hua Yang
Keyword(s):  
Reaction Time ◽  
Hydrothermal Synthesis ◽  
Hydrothermal Method ◽  
Pyrochlore Phase ◽  
Synthesis Temperature ◽  
Minimum Size ◽  
Hydrothermal Reactions ◽  
Prolonged Reaction Time ◽  
Scherrer Equation ◽  
Xrd Patterns

The cubic pyrochlore phase Bi1.5ZnNb1.5O7 nanopowder was successfully synthesized by the hydrothermal method (HTM) from the starting materials: Bi(NO3)3·5H2O, ZnO, Nb2O5 and the mineralizer: KOH. The XRD patterns prove that the cubic pyrochlore phase Bi1.5ZnNb1.5O7 nanopowder can be obtained by HTM, and TEM photographs show that the powders present the regularly granular shape, when the hydrothermal reactions were conducted at synthesis temperatures 140~220°C and reaction time for 6~48h. The crystalline sizes of the powders were calculated by the Scherrer equation to be about 43~49nm. The crystalline sizes decreased both with the increase in synthesis temperature and the prolonged reaction time until they reached to the minimum size about 43nm at 220°C for 24h.However, they tended to increase when the reaction time was above 24h.

scholarly journals Effect of the suspension of Ag-incorporated TiO2 nanoparticles (Ag-TiO2 NPs) on certain growth, physiology and phytotoxicity parameters in spinach seedlings

PLoS ONE ◽  
2020 ◽  
Vol 15 (12) ◽  
pp. e0244511
Author(s):  
Fernando Gordillo-Delgado ◽  
Jakeline Zuluaga-Acosta ◽  
Gonzalo Restrepo-Guerrero
Keyword(s):  
Particle Size ◽  
Titanium Dioxide Nanoparticles ◽  
Germination Rate ◽  
Sol Gel ◽  
Control Group ◽  
Human Consumption ◽  
X Ray Diffraction ◽  
X Ray ◽  
Growth Physiology ◽  
Powder Samples

In this work, the effect of the inoculation of silver-incorporated titanium dioxide nanoparticles (Ag-TiO2 NPs) in spinach seeds was evaluated on certain growth, physiology and phytotoxicity parameters of the plants. This is an important crop for human consumption with high nutritional value due to their low calorie and fat content, providing various vitamins and minerals, especially iron. These NPs were obtained by means of the sol-gel method and heat treatment; the resulting powder material was characterized using X-ray diffraction and scanning electron microscopy and the influence of these NPs on plants was measured by estimating the germination rate, monitoring morphological parameters and evaluating phytotoxicity. The photosynthetic activity of the spinach plants was estimated through the quantification of the Ratio of Oxygen Evolution (ROE) by the photoacoustic technique. Samples of TiO2 powder with particle size between 9 and 43 nm were used to quantify the germination rate, which served to determine a narrower size range between 7 and 26 nm in the experiments with Ag-TiO2 NPs; the presence of Ag in TiO2 powder samples was confirmed by energy-dispersive X-ray spectroscopy. The analysis of variance showed that the dependent variable (plant growth) could be affected by the evaluated factors (concentration and size) with significant differences. The statistical trend indicated that the application of the Ag-TiO2 NPs suspension of lowest concentration and smallest particle size could be a promoting agent of the growth and development of these plants. The inoculation with NPs of 8.3 nm size and lowest concentration was related to the highest average ROE value, 24.6 ± 0.2%, while the control group was 20.2 ± 0.2%. The positive effect of the Ag-TiO2 NPs treatment could be associated to the generation of reactive oxygen species, antimicrobial activity, increased biochemical attributes, enzymatic activity or improvements in water absorption.

Charge Transport Properties of a Partially Reduced V2O5 Xerogel Intercalated with a Polymer Electrolyte

1995 ◽  
Vol 393 ◽  
Author(s):  
Joyce Albritton Thomas ◽  
Grant M. Kloster ◽  
D. Shriver ◽  
C. R. Kannewurf
Keyword(s):  
Charge Transport ◽  
Transport Properties ◽  
Polymer Electrolyte ◽  
Variable Temperature ◽  
Sol Gel ◽  
Electronic Conductivity ◽  
Charge Carriers ◽  
Electronic Charge ◽  
Ionic Charge ◽  
Intimate Contact

ABSTRACTRecently, there has been considerable interest in advanced materials and processing techniques for practical applications. V2O5 xerogels have generated much attention because they are layered materials that undergo reversible redox intercalation with lithium. The sol-gel process has been used to intercalate V2O5 xerogels with the polymer electrolyte, oxymethylene linked poly(ethylene oxide) - lithium triflate [(a-PEO)n(LiCF3SO3)]. The resulting nanocomposite is a mixed ionic-electronic conductor in which the ionic charge carriers in the polymer electrolyte are in intimate contact with the electronic charge carriers in the V205 xerogel. Variable-temperature electronic conductivity and thermoelectric power measurements have been performed to examine the charge transport properties.

Preparation and Mechanical Properties of BiFeO3 Ceramics

2016 ◽  
Vol 697 ◽  
pp. 293-296
Author(s):  
Xiao Yang Zhang ◽  
Xi Wei Qi ◽  
Zhi Yuan Yang ◽  
Li Bao ◽  
Min Zhang
Keyword(s):  
Mechanical Properties ◽  
Hydrothermal Method ◽  
Perovskite Phase ◽  
Sol Gel ◽  
Cold Isostatic Pressing ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Three Point Bending ◽  
Multiferroic Bifeo ◽  
Sol Gel Process

Hydrothermal method and sol-gel process were used to synthesize multiferroic BiFeO3 ceramics. X-ray diffraction, scanning electron microscopy, vickers diamond indenter and three-point bending method were used to investigate the effects of methods on the phase structure, microstructures and mechanical properties. Cold isostatic pressing on the ceramics with two different loads (10 MPa, 200 MPa) was used to illustrate the influence of pressure in mechanical properties. The results show that all samples are crystallized in the perovskite phase. A few small traces of impurity are observed at a 2θ of ~28 o, which are found to be those of Bi2Fe4O9. The SEM images depict that samples prepared by sol-gel process are more uniform and the grain size is slightly larger than that of hydrothermal processed samples. The investigations on the hardness and flexural strength demonstrate the ceramics prepared by hydrothermal method have better mechanical properties than that of sol-gel process, and the mechanical properties can be obviously enhanced by increasing pressure.

Synthesis, characterization and application of submicron ZrSiO4 powder via sol-gel-microemulsion-hydrothermal method

2020 ◽  
Vol 828 ◽  
pp. 154332 ◽  
Author(s):  
Chao Wang ◽  
Qikun Wang ◽  
Kun Liu ◽  
Jianlei Liu ◽  
Yongqing Wang ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Sol Gel

Sol-Gel/Hydrothermal Method for the Synthesis of Ultralong (NH4)2V6O16·1.5H2O Nanobelts

2015 ◽  
pp. 153-160
Author(s):  
Liang Wang ◽  
Hong-Yi Li ◽  
Chuang Wei ◽  
Yu Wang ◽  
Bing Xie
Keyword(s):  
Hydrothermal Method ◽  
Sol Gel

Synthesis and Oxygen Sensing Properties of Ti1-xSnxO2 Solid Solutions Nanoparticles

2013 ◽  
Vol 575-576 ◽  
pp. 45-49
Author(s):  
Ai Qing Wu ◽  
Xin Zuo Fang ◽  
Xin Hua Lin ◽  
Huan Qin Wang ◽  
Ying Xian Wang ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Solid Solutions ◽  
Sol Gel ◽  
Hydrothermal Process ◽  
Typical Sample ◽  
Sol Gel Process ◽  
Crystallite Sizes ◽  
Hybrid Alkoxides ◽  
Xrd And Tem ◽  
High Temperature Calcination

Rutile Ti1xSnxO2(0.2x<1) solid solutions had been prepared using a sol-hydrothermal method, which combined the conventional sol-gel process with hydrothermal method. Hybrid alkoxides of Ti4+and Sn4+were used as precursors in the sol-gel process and Sn4+served as crystal-inducing agent during the formation of rutile crystal lattice in the hydrothermal process at 200°C. The microstructures and morphologies of nanoparticles were detected with XRD and TEM. Rutile Ti1xSnxO2solid solutions nanoparticles with well-distributed crystallite sizes about 10nm were obtained with Sn4+content above 20mol% without any high temperature calcination. The oxygen sensitivity properties of Ti1xSnxO2solid solutions had also been investigated. It is proved Ti1xSnxO2solid solutions exhibited higher oxygen responses than single TiO2or SnO2. A typical sample of Ti0.5Sn0.5O2presented the best sensitivity is approximately 6 under 400°C.

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