The role of surface wettability and surface charge of electrosprayed nanoapatites on the behaviour of osteoblasts

2010 ◽  
Vol 6 (3) ◽  
pp. 750-755 ◽  
Author(s):  
E.S. Thian ◽  
Z. Ahmad ◽  
J. Huang ◽  
M.J. Edirisinghe ◽  
S.N. Jayasinghe ◽  
...  
Keyword(s):  
Surface Charge ◽  
Surface Wettability

scholarly journals Role of divalent cations, pH, cytoskeleton componentes and surface charge on the adhesion of Trichomonas vaginalis to a polystyrene substrate

1987 ◽  
Vol 82 (3) ◽  
pp. 379-384 ◽  
Author(s):  
Fernando Costa e Silva Filho ◽  
Cezar Antonio Elias ◽  
Wanderley de Souza
Keyword(s):  
Surface Charge ◽  
Incubation Time ◽  
Trichomonas Vaginalis ◽  
Cytochalasin B ◽  
Culture Media ◽  
Divalent Cations ◽  
Polystyrene Beads ◽  
Different Strains ◽  
Adhesion Index

The process of adhesion of three different strains of Trichomonas vaginalis to a polystyrene substrate was analysed. The process of adhesion was dependent on the time of incubation and the pH of the phosphate-buffered solution (PBS) in which the parasites were suspended. The highest indices of adhesion were observed after an incubation time of 60 min at pH 6.6. The adhesion index increased when the parasites were incubated in the presence of culture media or when Ca++ or Mg++ was added to the PBS solution, whereas cytochalasin B, trypsin or neuraminidase reduced adhesion. Incubation of the parasites in the presence of poly-L-lysine facilitated the process of adhesion. Incubation of the parasites or polystyrene beads in the presence of poly-L-lysine led to important changes in their surface charge.

scholarly journals The role of surface charge in the interaction of nanoparticles with model pulmonary surfactants

Soft Matter ◽  
2018 ◽  
Vol 14 (28) ◽  
pp. 5764-5774 ◽  
Author(s):  
F. Mousseau ◽  
J.-F. Berret
Keyword(s):  
Surface Charge ◽  
Lipid Bilayers ◽  
Pulmonary Surfactant ◽  
Lipid Vesicles ◽  
Electrostatic Charge ◽  
Supported Lipid Bilayers ◽  
Pulmonary Surfactants ◽  
Inhaled Nanoparticles

Inhaled nanoparticles reaching the respiratory zone in the lungs enter first in contact with the pulmonary surfactant. It is shown here that nanoparticles and lipid vesicles formulated from different surfactant mimetics interact predominantlyviaelectrostatic charge mediated attraction and do not form supported lipid bilayers spontaneously.

scholarly journals Flax Biomass Conversion via Controlled Oxidation: Facile Tuning of Physicochemical Properties

2020 ◽  
Vol 7 (2) ◽  
pp. 38
Author(s):  
Leila Dehabadi ◽  
Abdalla H. Karoyo ◽  
Majid Soleimani ◽  
Wahab O. Alabi ◽  
Carey J. Simonson ◽  
...  
Keyword(s):  
Chemical Modification ◽  
Pore Structure ◽  
Surface Charge ◽  
Chemical Treatment ◽  
Textural Properties ◽  
Adsorption Properties ◽  
Biomass Composition ◽  
Adsorption Sites ◽  
Modified Forms

The role of chemical modification of pristine linen fiber (LF) on its physicochemical and adsorption properties is reported in this contribution. The surface and textural properties of the pristine LF and its peroxyacetic acid- (PAF) and chlorite-treated (CF) fiber forms were characterized by several complementary methods: spectroscopy (SEM, TEM, FT-IR, and XPS), thermal analysis (DSC and TGA), gas/water adsorption isotherms, and zeta potential (ξ). The results obtained reveal that the surface charge and textural properties (surface area and pore structure) of the LF material was modified upon chemical treatment, as indicated by changes in the biomass composition, morphology, ξ-values, and water/dye uptake properties of the fiber samples. Particularly, the pristine LF sample displays preferential removal efficiency (ER) of methylene blue (MB) dye with ER ~3-fold greater (ER~62%) as compared to the modified materials (CF or PAF; ER~21%), due to the role of surface charge of pectins and lignins present in pristine LF. At higher MB concentration, the relative ER values for LF (~19%) relative to CF or PAF (~16%) reveal the greater role of micropore adsorption sites due to the contributing effect of the textural porosity observed for the modified flax biomass at these conditions. Similar trends occur for the adsorption of water in the liquid vs. vapour phases. The chemical treatment of LF alters the polarity/charge of the surface functional groups, and pore structure properties of the chemically treated fibers, according to the variable hydration properties. The surface and textural properties of LF are altered upon chemical modification, according to the variable adsorption properties with liquid water (l) vs. water vapor (g) due to the role of surface- vs. pore-sites. This study contributes to an understanding of the structure-adsorption properties for pristine and oxidized flax fiber biomass. The chemical conversion of such biomass yields biomaterials with tunable surface and textural properties, as evidenced by the unique adsorption properties observed for pristine LF and its modified forms (CF and PAF). This study addresses knowledge gaps in the field by contributing insight on the relationship between structure and adsorption properties of such LF biomass in its pristine and chemically modified forms.

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