Bioactive glass nanoparticles with negative zeta potential

Doostmohammadi, Ali; Monshi, Ahmad; Salehi, Roya; Fathi, Mohammad Hossein; Golniya, Zahra; Daniels, A. U.

doi:10.1016/j.ceramint.2011.03.026

Cited by 165 publications

(89 citation statements)

References 23 publications

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“…The other functional group, represented by the smaller absorption bands in cockle shell was carboxylic acid which is at 2522.24 cm -1 [26]. The bending modes of calcium carbonate can be well defined by infrared band at 861.62 cm -1 [27]. The presence of aragonite in cockle shell can be further confirmed by a IR spectra at 1082.75 cm -1 of CO 3 2-symmetric stretching [26,28,29].…”

Section: Ftir Spectra Analysissupporting

confidence: 50%

Sorption equilibria of CO₂ on synthesized CaO in the presence of water

Azmi

Yusup

Sabil

2015

WIT Transactions on Ecology and the Environment

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Calcium-based adsorbents produced by biomass material is technically feasible, costly effective and advantageous to a certain extent in capturing CO 2 . Since the waste of a cockle shell is found to contain around 98% calcium, it can be a good source for CaCO 3 and yield CaO through the high temperature calcination process. The sorption equilibria of CO 2 on synthesized CaO with different amounts of water were measured experimentally by using a volumetric method at a temperature of 2°C. Under dry conditions, synthesized CaO has a low CO 2 uptake, as the adsorption rate of CO 2 in calcium-based sorbent is high at higher temperatures. While under wet conditions, the large increment of CO 2 adsorption was observed due to formation of CO 2 hydrates which were indicated by inflection of isotherms at a definite pressure of the S-shape. At the inflection point, the highest sorption capacity (5.07 mmol/g) was obtained at a water ratio of 0.55, which is about 30 times higher than dry samples. The trend of FTIR spectra were observed to be similar for raw cockle shells and wet CaO after CO 2 adsorption, in contrast with spectra of CaO before adsorption. The formation of CO 2 hydrate can be further verified by the changes of surface morphology of CaO, before and after adsorption. It can be concluded that calcium-based sorbent with the presence of water has the ability to be further utilized for CO 2 separation.

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Section: Ftir Spectra Analysissupporting

confidence: 50%

Sorption equilibria of CO₂ on synthesized CaO in the presence of water

Azmi

Yusup

Sabil

2015

WIT Transactions on Ecology and the Environment

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“…In this section an expression for the ζ -potential [18][19][20][21] and double layer specific differential capacitance for a long tube is developed. Both the double layer specific differential capacitance of a protein and its ζ -potential arise from the surface charge density and depend on the solution conditions through FIG.…”

Section: ζ -Potential and Numerical Solutions To The Specific Diffmentioning

confidence: 99%

“…Therefore, this paper also presents a new approach to relate the ζ -potential to the protein double layer specific differential capacitance. The Poisson-Boltzmann equation was numerically solved by a second-order difference method to obtain the double layer potential as a function of distance and surface charge density, which was then expressed in terms of the ζ -potential [18][19][20][21] enabling a nanopore EIS approach to single molecule or even local chain measurements of the ζ -potential.…”

Section: Introductionmentioning

confidence: 99%

Theoretical models for electrochemical impedance spectroscopy and local ζ-potential of unfolded proteins in nanopores

Vitarelli

Talaga

2013

The Journal of Chemical Physics

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Single solid-state nanopores find increasing use for electrical detection and/or manipulation of macromolecules. These applications exploit the changes in signals due to the geometry and electrical properties of the molecular species found within the nanopore. The sensitivity and resolution of such measurements are also influenced by the geometric and electrical properties of the nanopore. This paper continues the development of an analytical theory to predict the electrochemical impedance spectra of nanopores by including the influence of the presence of an unfolded protein using the variable topology finite Warburg impedance model previously published by the authors. The local excluded volume of, and charges present on, the segment of protein sampled by the nanopore are shown to influence the shape and peak frequency of the electrochemical impedance spectrum. An analytical theory is used to relate the capacitive response of the electrical double layer at the surface of the protein to both the charge density at the protein surface and the more commonly measured zeta potential. Illustrative examples show how the theory predicts that the varying sequential regions of surface charge density and excluded volume dictated by the protein primary structure may allow for an impedance-based approach to identifying unfolded proteins. © 2013 AIP Publishing LLC.

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“…There are two processing methods for synthesizing BGs: traditional melt quenching and versatile sol-gel methods. Between them, due to producing small glass particles with a high-surface area, increased resorption rate, and higher bioactivity, the sol-gel method is more attractive than the other [6,16,17]. Some of certain BGs have also shown the antibacterial e ect [1,18].…”

Section: Introductionmentioning

confidence: 99%

Copper-doped and copper-free bioactive glass nanopowders cytotoxicity and antibacterial activity assessment

Soltani-Dehnavi

Mehdikhani-Nahrkhalaji

Rafienia

et al. 2017

Scientia Iranica

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Abstract. The purpose of this study is to evaluate the antibacterial activity and cytotoxicity of copper-doped (Cu45SBG) and copper-free bioactive glass (45SBG) nanopowders. The antibacterial e ect was studied using Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) bacteria. The BG nanopowders were synthesized by the sol-gel technique. They were characterized by various techniques and their cytotoxicity was evaluated by MTT assay. Chemical compositions of BGs were as the same as the predicted compositions. The size of the BGs with an amorphous structure was measured to be around 100 nm. Both BG nanopowders have no antibacterial e ect on broth concentrations less than 12.5 mg/ml. They demonstrated similar antibacterial activity on E. coli with Minimum Bactericidal Concentration (MBC) of 12.5 mg/ml. Cu45SBG nanopowders with the MBC of 25 mg/ml were more e cient on S. aureous bacteria than 45SBG nanopowders with the MBC of 50 mg/ml. Compared to 45SBG, Cu45SBG showed much more cytotoxicity. 45SBG demonstrated similar cells viability to the control. It was concluded that to overcome cytotoxic e ect, Cu content of BGs nanopowders must be lower than the amount used in this research. Therefore, 45SBG nanopowders with considerable antibacterial activity could be used as a good candidate for biomedical applications.

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Bioactive glass nanoparticles with negative zeta potential

Cited by 165 publications

References 23 publications

Sorption equilibria of CO₂ on synthesized CaO in the presence of water

Sorption equilibria of CO₂ on synthesized CaO in the presence of water

Theoretical models for electrochemical impedance spectroscopy and local ζ-potential of unfolded proteins in nanopores

Copper-doped and copper-free bioactive glass nanopowders cytotoxicity and antibacterial activity assessment

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Bioactive glass nanoparticles with negative zeta potential

Cited by 165 publications

References 23 publications

Sorption equilibria of CO2 on synthesized CaO in the presence of water

Sorption equilibria of CO2 on synthesized CaO in the presence of water

Theoretical models for electrochemical impedance spectroscopy and local ζ-potential of unfolded proteins in nanopores

Copper-doped and copper-free bioactive glass nanopowders cytotoxicity and antibacterial activity assessment

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Product

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Sorption equilibria of CO₂ on synthesized CaO in the presence of water

Sorption equilibria of CO₂ on synthesized CaO in the presence of water