Structure and photoluminescence of Mg–Al–Eu ternary hydrotalcite-like layered double hydroxides

The fluorescence of Mg–Al–Eu ternary layered hydroxides response to tryptophan

“…In consideration of various factors, excitation wavelengths at 275 and 380 nm were selected in the Figure II shows the emission spectra of, the Mg–Al–Eu TLH, Trp and TLH–Trp composite under excitation at 275 nm. The strong red emissions at 596, 620, 656 and 702 nm attributed to 5 D 0 – 7 F J ( J = 1, 2, 3, 4) transitions of Eu(III) were observed in the TLH , and the strong peak at 378 nm may be related to band‐edge emission of Mg hydroxides . The emission at 398 nm was attributed to fluorescence of Trp solid, which was close to the literature value of solid Trp but had lower energy than that of the observed value for Trp in water .…”

“…This method recommends its application for fluorescence bioprobes. Accordingly, we had synthesized Mg–Al–Eu and Zn–Al–Eu ternary layered hydroxides, which have characteristic red emissions resulting from the 5 D 0 – 7 F j ( j = 1, 2, 3, 4) transitions of Eu(III) . Furthermore, in the present study we found that the strong red emissions attributed to the Mg–Al–Eu ternary layered hydroxide can be quenched by Trp.…”

“…Mg–Al–Eu TLH, with molar ratios of Mg:(Al + Eu) of 3:1 and Eu:(Al + Eu) of 0.2, was synthesized by the coprecipitation method . CO 2 ‐free deionized water was used in all experiments.…”

Tribological performance of Mg/Al/Ce layered double hydroxides nanoparticles and intercalated products as lubricant additives

“…It led to the increase of lattice parameter a and thickness of brucite-like layers which was related to the size of cations in the octahedrons due to the replacement of larger Ce 3+ . Moreover, it decreased the positive charge density so that the electrostatic attraction between cations and interlayer anions turned weaker which impacted the value of interlayer spacing d (003) [21,26]. Thus the d (003) of four samples rose continually with higher Ce 3+ proportion in the trivalent metal cations.…”

“…As the Ce/Al ratio equaled to 0.15, the peak of impurity which could be distinguished as CeO 2 appeared at 2Â = 29.28 • in spite of the high degree of crystallization [24,25]. However, as the Ce/Al molar ratio rose further, the diffraction intensity of M 2.5 (AC 0.25 )-LDHs weakened dramatically and peaks shape turned to be very low and wide due to the distortions of octahedrons in the laminates after substitution of more Al 3+ (ionic radius = 0.53Å) by larger Ce 3+ (ionic radius = 1.02Å) [21,22,26]. Peak (1 1 0) which almost disappeared in the high angle that proved the distortions directly and the peak of CeO 2 also arose at 30.34 • .…”