Effect of residual carbon on the phase transformation and microstructure evolution of alumina-mullite fibers prepared by sol-gel method

Flexible Al2SiO5 Nanofiber Membranes for Thermal Insulation in Lithium-Ion Batteries

“…Figure 1b−d shows the FT-IR spectra of the precursor fibers and the fibers sintered at different temperatures. For precursor fibers, the peaks at 2160, 1420, and 1290 cm −1 belonged to the vibration of the C−H bond, 39,40 the peaks at 1640 and 1600 cm −1 were attributed to the bending vibration of the O−H bond, 39,41,42 the peaks at 1085 and 1039 cm −1 were attributed to the vibrations of the Si−O−Si and Al−O−Al bonds, and the peak at 825 cm −1 belonged to the vibration of AlO 4 . 39 The two broad peaks near 491 and 481 cm −1 were attributed to the vibrations of the Al−O bond, 43 and the peak at 475 cm −1 was attributed to the symmetric stretching and asymmetric deformation vibrations of the bonds in Si−O−C of TEOS.…”

“…For precursor fibers, the peaks at 2160, 1420, and 1290 cm −1 belonged to the vibration of the C−H bond, 39,40 the peaks at 1640 and 1600 cm −1 were attributed to the bending vibration of the O−H bond, 39,41,42 the peaks at 1085 and 1039 cm −1 were attributed to the vibrations of the Si−O−Si and Al−O−Al bonds, and the peak at 825 cm −1 belonged to the vibration of AlO 4 . 39 The two broad peaks near 491 and 481 cm −1 were attributed to the vibrations of the Al−O bond, 43 and the peak at 475 cm −1 was attributed to the symmetric stretching and asymmetric deformation vibrations of the bonds in Si−O−C of TEOS. 40 For calcined fibers, the peaks at 2340 cm −1 were attributed to adsorbed CO 2 due to the high specific surface area of the material and the large gaps between the fibers, which also appeared in the precursor fibers.…”

Towards achieving ultrahigh thermal stability of fine-grained alumina fibers via segregation-induced ordered superstructures

“…Continuous alumina green fibers were prepared from the concentrated aluminum carboxylate and then combined with dry spinning. The preparation details were shown in our previous report 57,58 . Taking lanthanum nitrate hexahydrate as lanthanum source and adding lanthanum source in the solution reaction step, the addition amounts of lanthanum oxide (La2O3) were 0 wt.%, 0.25 wt.%, 0.5 wt.%, 0.75 wt.%, 1 wt.%, 3…”

Nanoconfined Synthesis of Lead Sulfide Quantum Dots Embedded in Mesoporous Aluminosilicate Glass with Adjustable Near-Infrared Broadband Luminescence

“…For example, Al 2 O 3 –SiO 2 binary glass prepared through the sol–gel process has a low preparation temperature (below 700 °C), and the glass samples have high purity and uniform composition distribution compared to those in the preparation temperature of 1500 °C by the melting process. Previous research has shown that aluminum lactate, which is a precursor to alumina, can be used to make alumina-containing glass in a silicon-containing/silicon-free environment. − Additionally, by altering the pH of the sol solution, uniform and clear xerogels may be obtained using the chelated lactic acid ligand. ,− Lead sulfide (PbS) colloidal quantum dots (CQDs) with a wide exciton Bohr radius and a small bandgap show the advantage of producing light at wavelengths ranging from visible to mid-infrared. − Moreover, PbS CQDs provide variant nonlinear optical (NLO) responses. In NIR, PbS CQDs exhibit saturable absorption, which can be exploited as a Q-switcher or passive mode-locker for NIR lasers. , The ionic precursor of PbS quantum dots may be evenly disseminated using the broad doping concentration adjusted across a wide gradient in the sol–gel process, which is an unmatched benefit of this approach compared to that of the conventional melting method.…”