The Specific Adsorption of Sodium Cations on Less Common Metal Oxides at High Ionic Strengths

Kosmulski, Marek; Rosenholm, Jarl B.

doi:10.1006/jcis.2001.8199

Cited by 13 publications

(3 citation statements)

References 15 publications

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“…This was observed in Nb 2 O 5 suspensions with NaI 20 and also observed in the present coated Nb 2 O 5 suspensions below pH = 9 where the higher zeta potential measured in the coated Nb 2 O 5 suspension was attributed to the adsorption of Mg 2+ cations on the surface of Nb 2 O 5 particles that made the Nb 2 O 5 surface potential more positive. In the study of Kormulski and Rosenholm, 25 the zeta‐potential shift of Nb 2 O 5 was significant for [NaI] > 0.01 M. However, the [Mg 2+ ] in our suspensions for zeta‐potential measurements was 2.1×10 −4 M, much lower than the [Na + ] in Kormulski and Rosenholm 25 . This suggests that Mg 2+ has a stronger specific adsorption on Nb 2 O 5 surface than Na + .…”

Section: Resultsmentioning

confidence: 51%

Comparison in the Coating of Mg(OH)₂ on Micron‐Sized and Nanometer‐Sized Nb₂O₅ Particles

Luo

Shih

2004

Int J Applied Ceramic Tech

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Using Mg(OH)2 coating on Nb2O5 particles as a model system, the effects of core particle size and that of aging on coating in an aqueous environment were investigated. Specifically, two Nb2O5 particle sizes were used in this study: micron‐sized commercial Nb2O5 powder and 17‐nm synthesized Nb2O5 particles. Coating of Mg(OH)2 on Nb2O5 was carried out by precipitating Mg(OH)2 from magnesium nitrate in an aqueous Nb2O5 suspension. The coating behavior of Mg(OH)2 on Nb2O5 was examined with optical microscopy, zeta‐potential measurement, and local chemical analysis by energy dispersion spectroscopy (EDS). The results showed that the size of Nb2O5 plays an important role in the coating behavior of Mg(OH)2. Optical micrographs, zeta‐potential measurements, as well as local EDS analysis all indicated that coating Mg(OH)2 on micron‐sized Nb2O5 particles was easier than on nanometer‐sized Nb2O5 particles. We attribute the difficulty in coating Mg(OH)2 on nanometer‐sized Nb2O5 to the enhanced dissolution of Mg(OH)2 by the nanometer particle size as a result of the Kelvin effect. Aging improved the coating on micron‐sized Nb2O5 but did not exhibit significant improvement in the Mg(OH)2 coating on nanometer‐sized Nb2O5 particles. It is likely that aging modified the coating behavior of Mg(OH)2 on Nb2O5 via a dissolution‐re‐precipitation mechanism.

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Section: Resultsmentioning

confidence: 51%

Comparison in the Coating of Mg(OH)₂ on Micron‐Sized and Nanometer‐Sized Nb₂O₅ Particles

Luo

Shih

2004

Int J Applied Ceramic Tech

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“…The J sc increase when the substrate FTO is replaced by IZO is initially considered by us to be due to the difference in the adsorbed dye concentration per unit volume. The rationale for this is that a better dye adsorption on the modified TiO 2 surface is possible, owing to a favorable point of zero charge, pH pzc being 9 for In 2 O 3 and ZnO, compared to pH pzc being 6 for TiO 2 . , This has not been the real situation, as the amounts of the adsorbed dye molecules are found to be almost the same, regardless of substrates, as confirmed by the measurements of the desorbed dye in 10 -3 M KOH. Obviously, the deposition of In and Zn oxides on TiO 2 does not affect dye adsorption.…”

Section: Resultsmentioning

confidence: 93%

Enhancement of Photocurrent and Photovoltage of Dye-Sensitized Solar Cells with TiO₂ Film Deposited on Indium Zinc Oxide Substrate

et al. 2003

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The effects of using indium zinc oxide (IZO) as a conducting substrate in dye-sensitized TiO 2 solar cells (DSC) on their photocurrent-voltage characteristics are studied. We have found that both short-circuit photocurrent (J sc ) and open-circuit voltage (V oc ) of IZO-based cells are substantially improved by about 40% and 10%, respectively, when compared with those of cells based on fluoride-doped tin oxide (FTO). The J sc increase is correlated to the improved contact between IZO and TiO 2 and enriched conduction band electrons in the TiO 2on-IZO electrode, due to the blocking of surface states by the evaporated metallic components of the substrate. The combined effects of the negative shift of flat band potential and the reduction in recombination explain the V oc increase. Our experimental finding suggests that IZO-coated substrate makes more efficient DSC than a FTO-coated one.

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“…37 Selective effects for the similar (weaker) interactions with the heavier alkali cations are less understood, in spite of the important number of works that have been devoted to their characterization. [38][39][40][41][42][43][44] Clearly, a more detailed analysis of the surface effects at the nanoscale would be required in order to rationalize the specificities for Na + /K + cation retention on the TiO 2 substrates derived from our experiments. Such a study is outside the scope of the present investigation.…”

Section: Resultsmentioning

confidence: 99%

Nanoparticle TiO₂ Films Prepared by Pulsed Laser Deposition: Laser Desorption and Cationization of Model Adsorbates

Gámez¹,

Reyes²,

Hurtado³

et al. 2010

J. Phys. Chem. C

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Titanium dioxide is a low-cost photocatalytic material in the chemical industry. This work provides extended insights into the use of TiO2 nanostructures in laser-assisted laser desorption ionization (LDI) of small peptides and synthetic polymers. The investigation evaluates the interfacial morphologies in the nanoscale that enhance the LDI efficiency in nanoparticle-assembled TiO2 films prepared by femtosecond and nanosecond pulsed laser deposition (PLD) at different laser wavelengths. It is shown that PLD provides robust substrates yielding LDI pulse energy thresholds and signal/noise ratios in the mass spectra for detection of cationized adducts that can be comparable to those obtained with TiO2 nanoparticle suspensions and with conventional organic matrices. The best LDI performance is found for nanosecond PLD crystalline substrates of the anatase polymorph and for femtosecond PLD amorphous substrates, with average nanoparticle sizes in both cases in the range of 25−55 nm.

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The Specific Adsorption of Sodium Cations on Less Common Metal Oxides at High Ionic Strengths

Cited by 13 publications

References 15 publications

Comparison in the Coating of Mg(OH)₂ on Micron‐Sized and Nanometer‐Sized Nb₂O₅ Particles

Comparison in the Coating of Mg(OH)₂ on Micron‐Sized and Nanometer‐Sized Nb₂O₅ Particles

Enhancement of Photocurrent and Photovoltage of Dye-Sensitized Solar Cells with TiO₂ Film Deposited on Indium Zinc Oxide Substrate

Nanoparticle TiO₂ Films Prepared by Pulsed Laser Deposition: Laser Desorption and Cationization of Model Adsorbates

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The Specific Adsorption of Sodium Cations on Less Common Metal Oxides at High Ionic Strengths

Cited by 13 publications

References 15 publications

Comparison in the Coating of Mg(OH)2 on Micron‐Sized and Nanometer‐Sized Nb2O5 Particles

Comparison in the Coating of Mg(OH)2 on Micron‐Sized and Nanometer‐Sized Nb2O5 Particles

Enhancement of Photocurrent and Photovoltage of Dye-Sensitized Solar Cells with TiO2 Film Deposited on Indium Zinc Oxide Substrate

Nanoparticle TiO2 Films Prepared by Pulsed Laser Deposition: Laser Desorption and Cationization of Model Adsorbates

Contact Info

Product

Resources

About

Comparison in the Coating of Mg(OH)₂ on Micron‐Sized and Nanometer‐Sized Nb₂O₅ Particles

Comparison in the Coating of Mg(OH)₂ on Micron‐Sized and Nanometer‐Sized Nb₂O₅ Particles

Enhancement of Photocurrent and Photovoltage of Dye-Sensitized Solar Cells with TiO₂ Film Deposited on Indium Zinc Oxide Substrate

Nanoparticle TiO₂ Films Prepared by Pulsed Laser Deposition: Laser Desorption and Cationization of Model Adsorbates