scholarly journals Stabilization of Li-Rich Disordered Rocksalt Oxyfluoride Cathodes by Particle Surface Modification

2020 ◽  
Vol 3 (6) ◽  
pp. 5937-5948 ◽  
Author(s):  
Andrew J. Naylor ◽  
Ida Källquist ◽  
David Peralta ◽  
Jean-Frederic Martin ◽  
Adrien Boulineau ◽  
...  
Keyword(s):  
Surface Modification ◽  
Particle Surface

New approach to improve polymer-Mg interface in biodegradable PLA/Mg composites through particle surface modification

2020 ◽  
Vol 383 ◽  
pp. 125285 ◽  
Author(s):  
Ana Ferrandez-Montero ◽  
Marcela Lieblich ◽  
Rosario Benavente ◽  
José Luis González-Carrasco ◽  
Begoña Ferrari
Keyword(s):  
Surface Modification ◽  
Particle Surface ◽  
New Approach

Study on Particle Surface Modification Using a Spouted Bed Plasma Reactor

2018 ◽  
Vol 44 (4) ◽  
pp. 236-241
Author(s):  
Nobusuke Kobayashi ◽  
Baiqiang Zhang ◽  
Kengo Hanai ◽  
Yoshinori Itaya
Keyword(s):  
Surface Modification ◽  
Plasma Reactor ◽  
Particle Surface ◽  
Spouted Bed

Surface Modification of Superparamagnetic Nanoparticles for in-vivo Bio-medical Applications

2001 ◽  
Vol 704 ◽  
Author(s):  
D. K. Kim ◽  
M. Toprak ◽  
M. Mikhailova ◽  
Y. Zhang ◽  
B. Bjelke ◽  
...  
Keyword(s):  
Surface Modification ◽  
Particle Surface ◽  
Superparamagnetic Iron Oxide ◽  
Superparamagnetic Nanoparticles ◽  
Computer Assisted ◽  
Operation Conditions ◽  
Coprecipitation Process ◽  
Equilibrium Calculations ◽  
Effect Of Surface

AbstractChemical modifications of Superparamagnetic Iron Oxide Nanoparticles (SPION) surfaces by attachment of functional groups and further covalent coupling with biodegradable substances have been studied. Based on computer-assisted chemical equilibrium calculations, several optimum operation conditions for a coprecipitation process of magnetite nanoparticles were predicted. These particles were immobilized by ultra-thin films of PVA, Dextran, Dextrin, PEG and MPEG to obtain a biocompatible particle surface for further functionalization purposes. The effect of surface modification of the superparamagnetic nanoparticles in terms of chemical and physical properties of the samples was investigated with several techniques, including microelectrophoresis measurement. The feasibility of using SPION in biomedical applications was investigated by in-vivo treatment in rat brains.

Preparation and Characterization of Surface Modification of Sphalerite Concentrate with Sodium Lignosulfonate

2008 ◽  
Vol 58 ◽  
pp. 91-96 ◽  
Author(s):  
Peng Peng ◽  
Jia Xiong Ke ◽  
Liang Hua Zhang ◽  
Ping Feng Fu ◽  
Xiao Hua Liu
Keyword(s):  
Contact Angle ◽  
Surface Modification ◽  
Particle Surface ◽  
Adsorption Rate ◽  
Photoelectron Spectra ◽  
Sodium Lignosulfonate ◽  
Xps Spectra ◽  
Ft Ir ◽  
Concentrate Particle

In order to prevent sphalerite particles from coming together in leaching solution, and to reduce the loss of organic solvent, the surface modification of sphalerite concentrate with sodium lignosulfonate was investigated. The modified sphalerite concentrate particles were characterized by dispersion experiments, determination of adsorption rate of oil, determination of contact angle, FT-IR spectra and X-ray photoelectron spectra. The results showed that the modified sphalerite concentrate particles exhibited good dispersibility in water. The sedimentation volume reduced from 0.85 ml•g-1 to 0.61 ml•g-1. The adsorption rate of oil reduced from 0.15 ml•g-1 to 0.06 ml•g-1. The contact angle between sphalerite concentrate particles and water changed from 86.9˚ before modification to 32.7˚ after modification with sodium lignosulfonate. The checking results of FT-IR and XPS spectra indicated that some modification regents were coated on the particle surface. The modifier combined to sphalerite concentrate particle surface through the chemical bond, resulting in the comprehensive stability action of static and steric effect.

Zirconia based feedstocks: Influence of particle surface modification on the rheological properties

2017 ◽  
Vol 43 (18) ◽  
pp. 16950-16956 ◽  
Author(s):  
M.C. Auscher ◽  
R. Fulchiron ◽  
N. Fougerouse ◽  
T. Périé ◽  
P. Cassagnau
Keyword(s):  
Surface Modification ◽  
Rheological Properties ◽  
Particle Surface

scholarly journals Synthesis and Surface Modification of Deagglomerated Superparamagnetic Nanoparticles

1996 ◽  
Vol 432 ◽  
Author(s):  
Christoph Lesniak ◽  
Thomas Schiestel ◽  
Riüdiger Nass ◽  
Helmut Schmidt
Keyword(s):  
Surface Modification ◽  
Iron Oxide ◽  
Particle Surface ◽  
Weight Ratio ◽  
Superparamagnetic Iron Oxide ◽  
Superparamagnetic Nanoparticles ◽  
Disintegration Time ◽  
Aqueous Suspensions ◽  
Aqueous Salt Solutions ◽  
Core Particles

AbstractA method for the preparation of aminosilane coated, chemically stable, agglomerate-free superparamagnetic iron oxide nanoparticles (ferrites, e.g. Fe3O4 and γ-Fe2O3) has been developed. These nanocomposite particles posess core-shell structure. The well crystallized core particles are prepared by precipitation from aqueous salt solutions (primary particle size 10 nm). The surface modification of the weakly agglomerated core particles with aminosilane (e.g. γ-aminopropyl- triethoxysilane) leads to deagglomerated particles, covered by a thin polymerized aminosilane shell. A strong dependency of the particle/agglomerate size on the silane/iron oxideratio as well as on the disintegration time was found. A ratio of aminosilane to iron oxide of 0.8 (weight ratio) and a disintegration time of 72h result in overall particle sizes in the range of 10–15 nm. After surface modification, aminogroups are present on the particle surface (IEP of 9.5). The particles show superparamagnetic behaviour (saturation magnetization 68 EMU/g) and aqueous suspensions are stable against agglomeration. A desorption of the coating in aqueous suspensions (pH 3 to 11) is not observed.

scholarly journals Influence of Carboxylic Modification Using Polyacrylic Acid on Characteristics of Fe3O4 Nanoparticles with Cluster Structure

Processes ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 1795
Author(s):  
Jae Rok Shin ◽  
Gye Seok An ◽  
Sung-Churl Choi
Keyword(s):  
Magnetic Properties ◽  
Surface Modification ◽  
Polyacrylic Acid ◽  
Fe3o4 Nanoparticles ◽  
Structural Changes ◽  
Cluster Structure ◽  
Particle Surface ◽  
High Tech ◽  
Optical Parameters ◽  
Surface Modified

Fe3O4 nanoparticles with cluster structure are superparamagnetic particles with applicability in various high-tech fields. In this study, the influence of surface modification with polyacrylic acid (PAA), a polymeric precursor, on the characteristics of Fe3O4 nanoparticles was investigated. The particles were synthesized by the polyol method and surface modified with various amounts of PAA. The surficial, structural, optical, and magnetic properties of the PAA-modified Fe3O4 nanoparticles were analyzed, confirming that negatively charged carboxyl groups were formed on the particle surface, and the particle dispersibility was enhanced by surface modification. This arises from an increase in the electrostatic repulsive force due to the surface functional groups. Functionalization promoted dissociation of the cluster particles, which became more pronounced as the PAA content increased. The optical parameters changed with the PAA content. Analysis of the magnetic properties showed that the saturation magnetization decreased as the PAA content increased. Overall, PAA modification induces structural changes of the Fe3O4 nanoparticles that enhance the dispersibility and influence the characteristics of the particles.

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