Nanocomposites of cellulose/iron oxide: influence of synthesis conditions on their morphological behavior and thermal stability

2012 ◽  
Vol 32 (6) ◽  
pp. 1511-1517 ◽  
Author(s):  
Ming-Guo Ma ◽  
Jie-Fang Zhu ◽  
Shu-Ming Li ◽  
Ning Jia ◽  
Run-Cang Sun
Keyword(s):  
Thermal Stability ◽  
Iron Oxide ◽  
Synthesis Conditions ◽  
Morphological Behavior

Self-Assembled Monolayer Coatings on Amorphous Iron and Iron Oxide Nanoparticles:  Thermal Stability and Chemical Reactivity Studies

Langmuir ◽  
1997 ◽  
Vol 13 (23) ◽  
pp. 6151-6158 ◽  
Author(s):  
G. Kataby ◽  
T. Prozorov ◽  
Yu. Koltypin ◽  
H. Cohen ◽  
Chaim N. Sukenik ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Chemical Reactivity ◽  
Oxide Nanoparticles ◽  
Self Assembled Monolayer ◽  
Amorphous Iron ◽  
Self Assembled

scholarly journals Morphogenesis of Magnetite Mesocrystals: Interplay Between Nanoparticle Morphology and Solvation Shell

2021 ◽  
Author(s):  
Julian Brunner ◽  
Britta Maier ◽  
Sabrina L. J. Thomä ◽  
Felizitas Kirner ◽  
Igor Baburin ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Analytical Ultracentrifugation ◽  
Function Analysis ◽  
Solvation Shell ◽  
Double Difference ◽  
Oxide Nanoparticles ◽  
Synthesis Conditions ◽  
Nanoparticle Morphology ◽  
Solvent Molecules

In this study, faceted mesocrystals have been assembled from the dispersion of truncated cubic-shaped iron oxide nanoparticles stabilized by oleic acid (OA) molecules using the non-solvent “gas phase diffusion technique” into an organic solvent. The effects of synthesis conditions as well as of the nanoparticle size and shape on the structure and morphogenesis of mesocrystals were examined. The interactions of OA capped iron oxide nanoparticles with solvent molecules were probed by analytical ultracentrifugation and double difference pair distribution function analysis. It was shown that the structure of the organic shell significantly depends on the nature and polarity of solvent molecules.

Preparation and characterization of a novel amphoteric polymer for oil well cementing with superior performances

2020 ◽  
Vol 29 (1) ◽  
pp. 29-39
Author(s):  
Tang Xin ◽  
Hu Xuzeng ◽  
Wan Haodong
Keyword(s):  
Thermal Stability ◽  
Orthogonal Experiment ◽  
Radical Copolymerization ◽  
Proton Nuclear Magnetic Resonance ◽  
Fluid Loss ◽  
Resonance Spectroscopy ◽  
Oil Well ◽  
Cement Slurry ◽  
Synthesis Conditions ◽  
Th 1

A novel amphoteric polymer TH-1 was synthesized using the monomers of 2-acrylamido-2-methylpropane sulfonic acid, acrylic acid, acrylamide, and cationic monomer through radical copolymerization as filtrate loss reducer in oil well cementing. Optimal synthesis conditions of TH-1 were obtained by an orthogonal experiment. The composition of copolymer (TH-1) was characterized by Fourier-transform infrared spectrum and proton nuclear magnetic resonance spectroscopy. The thermal stability of the synthesized copolymer was tested by thermogravimetric analysis. The fluid loss (FL) control and thickening performance of cement slurry incorporating TH-1 were evaluated at different temperatures. The filtration reduction mechanism of TH-1 was finally discussed. Results suggest that the amphoteric polymer is the target product polymerized by all the monomers, which presents excellent filtrate reduction property, high thermal stability, and strong saline tolerance under 200°C. The amphoteric polymer TH-1 includes cationic and anionic group in a molecule structure, which can adsorb firmly onto the surface of cement particles through electrostatic attraction and form adsorption membrane of viscoelastic polymer. In this way, compact cement filter cakes are formed, thereby efficiently reducing the FL.

Nanometer-Scale Iron Oxide Magnetic Particles: Synthesis and Magnetic Properties

1990 ◽  
Vol 206 ◽  
Author(s):  
John K. Vassiliou ◽  
Vivek Mehrotra ◽  
Michael W. Russell ◽  
Emmanuel P. Giannelis
Keyword(s):  
Magnetic Susceptibility ◽  
Iron Oxide ◽  
Magnetic Particles ◽  
Average Diameter ◽  
Nanometer Scale ◽  
Iron Oxide Particles ◽  
Porous Network ◽  
Synthesis Conditions ◽  
Oxide Particles ◽  
The Magnetic Field

ABSTRACTNanometer-scale iron oxide magnetic particles have been formed in the porous network of a cross-linked polymer matrix by ion exchange and subsequent hydrolysis. The oxide particles are uniform, well-dispersed and spherical with a diameter ranging between 30 and 1200 Å depending on the synthesis conditions. The DC magnetic susceptibility, measured between 4 and 300 K, continuously increases with decreasing temperature and tends to saturate at low temperatures. Composites containing iron oxide particles with an average diameter of 80 Å exhibit superparamagnetism while those on the order of 1000 Å undergo an antiferromagnetic-type transition at 33 K. The magnetic susceptibility is critically dependent upon the particle size and the strength of the magnetic field.

Effect of synthesis conditions on the properties of citric-acid coated iron oxide nanoparticles

2013 ◽  
Vol 110 ◽  
pp. 329-334 ◽  
Author(s):  
L. Li ◽  
K.Y. Mak ◽  
C.W. Leung ◽  
K.Y. Chan ◽  
W.K. Chan ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Citric Acid ◽  
Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Synthesis Conditions

Synthesis, Characterization and Thermal Stability of Highly Crystallized Titania Nanotubes

2004 ◽  
Vol 836 ◽  
Author(s):  
B. Poudel ◽  
W. Z. Wang ◽  
C. Dames ◽  
J. Y. Huang ◽  
S. Kunwar ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Hydrothermal Method ◽  
Phase Stability ◽  
Acid Treatment ◽  
Filling Fraction ◽  
Volume Filling ◽  
Synthesis Conditions ◽  
Outside Diameter ◽  
Thermal Stability Of ◽  
Crystallization Structure

ABSTRACTGram quantities of titania (TiO2) nanotubes, with typical outside diameter about 9 nm, wall thickness about 2.5 nm, and length about 600 nm, were synthesized from anatase nano- and micro-powder using the hydrothermal method. The crystallization, structure, and phase stability of the nanotubes at high temperatures were systematically studied. A morphology change from nanotube to nanowire was observed at 650°C. The as-prepared nanotubes were usually contaminated with sodium impurities, other TiO2-derived phases and were poorly crystallized, but under optimized synthesis conditions the impurity phases was completely removed, resulting in highly crystallized pure nanotubes. The volume filling fraction of the autoclave as well as the concentration of the acid treatment were found to be particularly important for controlling the purity and crystallinity of the resulting nanotubes.

Bonding and thermal stability of cysteine on single-crystalline iron oxide surfaces and Pt(111)

2020 ◽  
Vol 152 (6) ◽  
pp. 064701 ◽  
Author(s):  
Jasmin-Mathelda Abdou ◽  
Peter Seidel ◽  
Martin Sterrer
Keyword(s):  
Thermal Stability ◽  
Iron Oxide ◽  
Oxide Surfaces ◽  
Single Crystalline ◽  
Thermal Stability Of
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