scholarly journals On the effect of particle surface chemistry in film stratification and morphology regulation

Soft Matter ◽  
2020 ◽  
Vol 16 (27) ◽  
pp. 6371-6378
Author(s):  
Archana Samanta ◽  
Romain Bordes
Keyword(s):  
Surface Chemistry ◽  
Silica Nanoparticles ◽  
Particle Surface ◽  
Forming Process ◽  
Film Forming

The surface chemistry of silica nanoparticles and the resulting gelling tendency influence the stratification in the film forming process.

scholarly journals Biological Fate of Fe3O4 Core-Shell Mesoporous Silica Nanoparticles Depending on Particle Surface Chemistry

Nanomaterials ◽  
2017 ◽  
Vol 7 (7) ◽  
pp. 162 ◽  
Author(s):  
Estelle Rascol ◽  
Morgane Daurat ◽  
Afitz Da Silva ◽  
Marie Maynadier ◽  
Christophe Dorandeu ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Surface Chemistry ◽  
Silica Nanoparticles ◽  
Mesoporous Silica Nanoparticles ◽  
Particle Surface ◽  
Core Shell ◽  
Biological Fate ◽  
Fe3o4 Core

New surface treatment techniques to minimize copper alloy leaching in drinking water

2012 ◽  
Vol 7 (4) ◽  
Author(s):  
Norikazu Sugaya
Keyword(s):  
Surface Treatment ◽  
Raw Materials ◽  
Organic Film ◽  
Forming Process ◽  
Mixed Acid ◽  
Treatment Techniques ◽  
Acid Washing ◽  
Washing Process ◽  
Film Forming ◽  
Materials Used

This new surface treatment is simple and easy as well as low in cost. The processes can even be performed by hand. Pharmaceutical raw materials used for the surface treatment, such as hydrochloric acid and nitric acid used in a mixed acid washing process and vegetable oil used in an organic film forming process, are easily obtained in many countries.

scholarly journals Development of A Flexible Cell Targeting System Based on Silica Nanoparticles

1998 ◽  
Vol 530 ◽  
Author(s):  
T. Schiimstel ◽  
H. Schirra ◽  
J. Gerwann ◽  
C. Lesniak ◽  
A. Kalaghi-Nafchi ◽  
...  
Keyword(s):  
Silica Nanoparticles ◽  
Electrostatic Interactions ◽  
Particle Concentration ◽  
Biological Function ◽  
Particle Surface ◽  
Cell Types ◽  
Silica Particles ◽  
Hydrodynamic Diameter ◽  
Reaction Conditions ◽  
Physiological Conditions

AbstractCommercially available and synthesized silica particles were fluorescently labeled with FITC and modified to get a wide variety of particle systems with defined size and surface charge. By a variation of reaction conditions particles with diameters of 10 and 80 nm determined with TEM and with zetapotentials between -50 to +30 mV under physiological conditions (pH: 7.4, PBS-buffer) were available.A further molecular shell consisiting of avidin was obtained by binding the molecules to negatively charged particle surfaces through electrostatic interactions. The amount of avidin coupled to the silica particles was 1.7 μg per mg particle. Starting with particles with an hydrodynamic diameter determined with PCS of 260 nm, the size increased to 500 nm, while the zeta potential was altered to -8 mV under physiological conditions.Biotinylated wheat germ agglutinin (bio-WGA) can be bonded to such particles through avidin / biotin complex formation. Up to 2.8 μg lectin per mg particles could be coupled to the particle surface. This leads to a further increase of hydrodynamic diameter to 650 nm. It could be shown by hemagglutination test, that the bonded lectin is still active. No toxic effects of the silica particles were found at 1 wt.-% particle concentration with various cell types (Caco-2, L132). The binding of lectin-particle complexes to cells was increased by a factor of 4.4 in comparison to uncoated particles.In addition it was found that WGA can directly be coupled to the particle surface. An amount of 1.8 μg Lectin per mg particle was determined. The hydrodynamic diameter increases from 260 nm to 432 rm, while a zetapotential of-28 mV was found under physiological conditions.It could be shown, that negatively charged silica nanoparticles are suitable systems to couple various biomolecules retaining their biological function.

Cysteine-Induced Modifications of Zero-valent Silver Nanomaterials: Implications for Particle Surface Chemistry, Aggregation, Dissolution, and Silver Speciation

2012 ◽  
Vol 46 (13) ◽  
pp. 7037-7045 ◽  
Author(s):  
Andreas P. Gondikas ◽  
Amanda Morris ◽  
Brian C. Reinsch ◽  
Stella M. Marinakos ◽  
Gregory V. Lowry ◽  
...  
Keyword(s):  
Surface Chemistry ◽  
Particle Surface ◽  
Silver Nanomaterials

scholarly journals Identification of Toxicity Parameters Associated with Combustion Produced Soot Surface Chemistry and Particle Structure by in Vitro Assays

Biomedicines ◽  
2020 ◽  
Vol 8 (9) ◽  
pp. 345
Author(s):  
Heba Al Housseiny ◽  
Madhu Singh ◽  
Shaneeka Emile ◽  
Marvin Nicoleau ◽  
Randy L. Vander Wal ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Surface Chemistry ◽  
Cell Viability ◽  
Health Effects ◽  
Stress Responses ◽  
Surface Composition ◽  
Particle Surface ◽  
In Vitro Assays ◽  
Epithelial Cell Line ◽  
And Oxidative Stress

Air pollution has become the world’s single biggest environmental health risk of the past decade, causing millions of yearly deaths worldwide. One of the dominant air pollutants is fine particulate matter (PM2.5), which is a product of combustion. Exposure to PM2.5 has been associated with decreased lung function, impaired immunity, and exacerbations of lung disease. Accumulating evidence suggests that many of the adverse health effects of PM2.5 exposure are associated with lung inflammation and oxidative stress. While the physical structure and surface chemistry of PM2.5 are surrogate measures of particle oxidative potential, little is known about their contributions to negative health effects. In this study, we used functionalized carbon black particles as surrogates for atmospherically aged combustion-formed soot to assess the effects of PM2.5 surface chemistry in lung cells. We exposed the BEAS-2B lung epithelial cell line to different soot at a range of concentrations and assessed cell viability, inflammation, and oxidative stress. Our results indicate that exposure to soot with varying particle surface composition results in differential cell viability rates, the expression of pro-inflammatory and oxidative stress genes, and protein carbonylation. We conclude that particle surface chemistry, specifically oxygen content, in soot modulates lung cell inflammatory and oxidative stress responses.

scholarly journals Controlling Foam Morphology of Poly(methyl methacrylate) via Surface Chemistry and Concentration of Silica Nanoparticles and Supercritical Carbon Dioxide Process Parameters

2013 ◽  
Vol 2013 ◽  
pp. 1-13 ◽  
Author(s):  
Deniz Rende ◽  
Linda S. Schadler ◽  
Rahmi Ozisik
Keyword(s):  
Carbon Dioxide ◽  
Surface Modification ◽  
Supercritical Carbon Dioxide ◽  
Surface Chemistry ◽  
Silica Nanoparticles ◽  
Process Parameters ◽  
Process Conditions ◽  
Average Cell ◽  
Foam Morphology ◽  
Supercritical Carbon

Polymer nanocomposite foams have received considerable attention because of their potential use in advanced applications such as bone scaffolds, food packaging, and transportation materials due to their low density and enhanced mechanical, thermal, and electrical properties compared to traditional polymer foams. In this study, silica nanofillers were used as nucleating agents and supercritical carbon dioxide as the foaming agent. The use of nanofillers provides an interface upon which CO2nucleates and leads to remarkably low average cell sizes while improving cell density (number of cells per unit volume). In this study, the effect of concentration, the extent of surface modification of silica nanofillers with CO2-philic chemical groups, and supercritical carbon dioxide process conditions on the foam morphology of poly(methyl methacrylate), PMMA, were systematically investigated to shed light on the relative importance of material and process parameters. The silica nanoparticles were chemically modified with tridecafluoro-1,1,2,2-tetrahydrooctyl triethoxysilane leading to three different surface chemistries. The silica concentration was varied from 0.85 to 3.2% (by weight). The supercritical CO2foaming was performed at four different temperatures (40, 65, 75, and 85°C) and between 8.97 and 17.93 MPa. By altering the surface chemistry of the silica nanofiller and manipulating the process conditions, the average cell diameter was decreased from9.62±5.22to1.06±0.32 μm, whereas, the cell density was increased from7.5±0.5×108to4.8±0.3×1011cells/cm3. Our findings indicate that surface modification of silica nanoparticles with CO2-philic surfactants has the strongest effect on foam morphology.

The influence of fluorescent silica nanoparticle surface chemistry on the energy transfer processes with lipid bilayers

RSC Advances ◽  
2016 ◽  
Vol 6 (58) ◽  
pp. 52674-52682 ◽  
Author(s):  
L. Zuccarello ◽  
E. Rampazzo ◽  
L. Petrizza ◽  
L. Prodi ◽  
C. Satriano
Keyword(s):  
Energy Transfer ◽  
Surface Chemistry ◽  
Silica Nanoparticles ◽  
Lipid Bilayers ◽  
Silica Nanoparticle ◽  
Transfer Processes ◽  
Nanoparticle Surface

A study of 3D and 2D intracellular FRET processes at the interface between surface tailored silica nanoparticles and lipid bilayers.

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