Aluminum oxide nanofibers

Catalog	ACM1344281-60
CAS	1344-28-1
Structure
Synonyms	Al2O3, Nanofibrous inorganic powder
Molecular Formula	Al2O3
Melting Point	2072 °C
Appearance	white
Application	Gamma Alumina has applications in optical displays, catalyst and catalyst carrier, electrical components- electrical insulator, thermal conductor, nanocomposites, separator, separator material for batteries.
Storage	Storage Class Code: 13 - Non Combustible Solids
Fiber Diameter	300-900 nm ± 100
Form	nanofiber powder (3D cotton/white fluffy)
Length	2-hundreds of μm
Packaging	5g/10g
Specification	primary crystallite size: gamma Typical Size of Crystallites:N/A
Specific Surface Area	40-70 m2/g
Thermal Conductivity	30 Wm-1K-1
Type	Polycystalline nanofibers

Case Study

Research on Oil Well Cement Composites Enhanced with Alumina Nanofiber Reinforcement

Dai, Tian, et al. Construction and Building Materials, 2023, 364, 129913.

The study explored how alumina nanofibers (ANF) function as an additive to improve mechanical properties in oil well cement composites during high temperature and pressure curing conditions.
• Experimental Design
Oil well cement composites received different amounts of ANFs which varied between 0.1% to 0.4% of the cement's weight. The samples experienced an initial curing phase at 50 °C for seven days which represented the standard curing duration leading up to injection procedures. The samples underwent three days of exposure to 300 °C temperature and 13 MPa pressure which matches typical injection operation conditions. The study evaluated how these materials affected rheological properties, compressive strength, and tensile strength and examined stress-strain behavior along with mineralogy and microstructure.
• Key Findings
A maximum ANF addition threshold exists which demonstrates that increased amounts beyond this point fail to improve the cement composite's strength. Maximum compressive strength increased by 9.18% and tensile strength by 28.85% when cement composites had 0.3% ANFs incorporated. The inclusion of ANFs improved the pore structure and promoted the creation of hydration gels while simultaneously decreasing xonotlite formation in the cement matrix.

Effect of Different Morphologies of Alumina Fillers on the Properties of Hybrid PMMA Composites

Alzarrug, Faisal Ali, et al. Materials & Design, 2015, 86, 575-581.

This work investigated the differences in mechanical properties of alumina fillers with different morphologies, including nano-sized alumina spherical particles, alumina whiskers, electrospun spherical microparticles, and electrospun alumina nanofibers, used to reinforce PMMA-based composites.
• Preparation of hybrid PMMA composites
The above four alumina fillers with different morphologies were added to KM liquid. The mixture was ultrasonicated for 60 min to disperse the KM powder in the mixture. After manual mixing for 2 min, the mixture was poured into a casting mold with a size suitable for DMA and nanoindentation tests. The casting mold was covered with a glass cover to ensure that the sample surface remained smooth. The PMMA/MMA mass ratio was 0.75. Samples with alumina filler contents of 1 wt.%, 3 wt.%, and 5 wt.% were prepared, respectively.
• Key Findings
Tests revealed that mechanical performance peaked when the filler quantity reached 3 wt.%. The mechanical properties of the product enhanced by whiskers outperformed those improved with spherical nanoparticles. The composite demonstrated highest performance among all samples when electrospun alumina with micron-sized particles and nano-sized fibers reached 3 wt.% in composition.