Layered Pr-dodecyl sulfate mesophases as precursors of Pr2O2SO4 having a large oxygen-storage capacity

Machida, Masato; Kawamura, Kiyotaka; Kawano, Tomoatsu; Zhang, Donjie; Ikeue, Keita

doi:10.1039/b605518d

Cited by 71 publications

(67 citation statements)

References 21 publications

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“…While the band at 1219 cm −1 is assigned to the A component, the band at 1249 cm −1 and the SO 2 symmetric stretching band (ν sym (SO 2 )) are associated to the E component. It is important to mention that the directions of the dipole components are orthogonal to each other [43,44] as it was confirmed by our theoretical calculations. Li and Tripp [43] suggested that the relation between the ν as (SO 2 ) band intensities made allusion to important insights about the lateral electrostatic headgroup interaction.…”

Section: Headgroup Vibrational Regionsupporting

confidence: 83%

“…Some studies suggest that the ν sym (SO 2 ) mode changes in the presence of cationic surfactants [11,43] or charged particles [42,44]. Using the B3LYP/6-311++G(d,p) method, it was possible to determine that the frequencies of the ν sym (SO 2 ) mode in the presence of Na + counterion are reduced in about 30 cm −1 , as compared with the absence of Na + counterion (see Figure 3).…”

Section: Headgroup Vibrational Regionmentioning

confidence: 99%

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Infrared Spectroscopy of Anionic, Cationic, and Zwitterionic Surfactants

Viana

Silva

Pimentel

2012

Advances in Physical Chemistry

249

167

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This paper describes the ordering degree of anionic, cationic, and zwitterionic surfactants with the increase of their packing density on Ge substrate by using Fourier transform infrared-attenuated total reflection (FTIR-ATR) spectroscopy. This work shows new insights on the conformational order of sodium dodecyl sulfate (SDS), N-hexadecyl-N-N-dimethyl-3-ammonio-1-propanesulfonate (HPS), hexadecyl-trimethylammonium bromide (CTAB), and dodecyl trimethylammonium bromide (DTAB). DFT and semiempirical calculations are also performed in order to evaluate the effect of headgroup hydration and counterion. The CH 2 asymmetric and symmetric stretching bands for the SDS molecule show a shift of 1.7 and 0.9 cm −1 to higher frequencies as the packing density increases, while it is observed a shift of 2.6 and 2.7 cm −1 for the HPS molecule, respectively. The DTAB molecule shows a shift of 4.5 cm −1 to lower frequencies for both CH 2 asymmetric and symmetric stretching bands as the packing density increases, indicating the decrease of gauche conformations and the increase of all-trans conformations over the aliphatic chain.

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Section: Headgroup Vibrational Regionsupporting

confidence: 83%

Section: Headgroup Vibrational Regionmentioning

confidence: 99%

Infrared Spectroscopy of Anionic, Cationic, and Zwitterionic Surfactants

Viana

Silva

Pimentel

2012

Advances in Physical Chemistry

249

167

View full text Add to dashboard Cite

show abstract

“…In both of the A vibration modes of -OSO − 3 , the low energy shift of approximately 20 cm −1 is found. Similar lower shifts of A modes of -OSO − 3 are reported for α-Fe 2 O 3 bounded by DS [27] and Pr 2 (OH) 5 -DS [28]. These shifts were associated with an electrostatic effect involving coordination of the sulfate headgroup (-OSO − 3 ) oxygen atom bound to Fe 3+ or Pr 3+ .…”

Section: Optical Studysupporting

confidence: 81%

Fabrication of ZnO nanoparticles by laser ablation of sintered ZnO in aqueous solution

et al. 2012

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Fabrication of ZnO nanoparticles by laser ablation in liquid medium is reported. The possibility of using a sintered ZnO target for the ablation as well as a Zn plate is demonstrated. The appropriate aqueous solution of sodium dodecyl sulfate is found to be 1 mM for ZnO growing. The shape of ZnO nanoparticles is sphere and its diameter is 30 ∼ 60 nm. Fourier transform infrared spectra, Raman scattering spectra, and photoluminescence spectra reveal the optical properties of ZnO nanoparticles. Nanoparticles obtained by using ZnO targets show a smaller defect density compared with those by using Zn targets.

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“…The red emission was greatly enhanced by a factor~500 compared with that of the precursor (Fig. 19) [41]. The high processing temperature (over 800 C) and release of SO 2 through these routes are neither economically nor environmentally desirable.…”

Section: Oxide Phosphors Derived From Lreh Compoundsmentioning

confidence: 98%