Ultralight Magnetic Nanofibrous GdPO₄ Aerogel

Abstract

Anisotropic aerogels are promising bulk materials with a porous 3D structure, best known for their large surface area, low density, and extremely low thermal conductivity. Herein, we report the synthesis and some properties of ultralight magnetic nanofibrous GdPO4 aerogels. Our proposed GdPO4 aerogel synthesis route is eco-friendly and does not require any harsh precursors or conditions. The most common route for magnetic aerogel preparation is the introduction of magnetic nanoparticles into the structure during the synthesis procedure. However, the nanofibrous GdPO4 aerogel reported in this work is magnetic by itself already and no additives are required. The hydrogel used for nanofibrous GdPO4 aerogel preparation was synthesized via a hydrothermal route. The hydrogel was freeze-dried and heat-treated to induce a phase transformation from the nonmagnetic trigonal to magnetic monoclinic phase. Density of the obtained magnetic nanofibrous monoclinic GdPO4 aerogel is only ca. 8 mg/cm3.

Magnetic Fe1.3Ni0.7P Aerogels Prepared from Nanoparticle Assembly: The Functional Whole Is the Sum of Its Parts

“…We note that the majority of magnetic aerogels known to date are composites of magnetic components folded into nonmagnetic oxides, carbon, or polymers . While single-phase oxide-based magnetic aerogels are documented, − and a magnetic aerogel based on gadolinium phosphate was recently reported, the present work represents the first example, to the best of our knowledge, of a phosphide-based magnetic aerogel …”

Judd‐Ofelt analysis and optical properties of Eu3+‐doped GdPO4 phosphors synthesized by combustion method

“…According to this method, the 5 D 0 → 7 F 1 MD and 5 D 0 → 7 F 2,4,6 ED transitions are used for calculating the Ω λ parameters 33 . It is known that the transition probability of the 5 D 0 → 7 F 1 allowed MD transition is calculated by following expression: 19 $$$$\begin{equation}{A}_{M{\mathrm{D}}}({}^5{D}_0 \to {}^7{F}_1) = \frac{{64{\pi }^4{\nu }^3{n}^3{S}_{M{\mathrm{D}}}}}{{3h(2J + 1)}}\end{equation}$$$$where J is the total angular momentum of the 5 D 0 state ( J = 0), ν is the energy of the 5 D 0 → 7 F 1 transition, n is the refractive index of host matrix (refractive index of GdPO 4 was 1.97 33 ), and S MD is magnetic dipole line strength which depends only on rare earths and is almost independent of the compound 22 . Thus, the A MD ( 5 D 0 → 7 F 1 ) parameter of GdPO 4 :Eu 3+ can obtain through the following relationship: $$$$\begin{equation}\frac{{{A}_{M{\mathrm{D}}}}}{{{A}_{0M{\mathrm{D}}}}} = {\left( {\frac{n}{{{n}_0}}} \right)}^3\end{equation}$$$$where A 0MD and n 0 are the transition probability and refractive index of any published materials.…”

Magnetic aerogel: an advanced material of high importance

“…This magnetic aerogel was recommended for several potential applications. 134 A magnetic aerogel with the magnetic property was prepared using sodium carboxymethyl cellulose incorporated with montmorillonite clay by a sol-gel approach followed by freezedrying and carbonization at high temperature (950 C in an inert atmosphere). The aerogel had low density (64 mg cm À3 ), high surface area (185 m 2 g À1 ) was highly ferromagnetic (31.10 emu g À1 ) at room, and showed high adsorption capacity (10-20 times its weight) for oils and organic solvents.…”