Silica dioxide- vitreous milled nanofiber

Catalog	ACM60676860-10
CAS	60676-86-0
Structure
Molecular Weight	60.08
Molecular Formula	SiO2
Application	Inorganic nanofibers have unique properties (i.e. high surface area, high porosity, good breathability, large surface to volume ratio, and stability) their applications include anodes and cathodes in li-ion batteries. The can additionally act as a fuel cell separator, catalyst, catalyst support, photo catalyst, gas sensors, thermal insulators, metal or ceramic nano-composites, dehumidifiers, abrasives, thermal barrier coatings, and filtration.
Form	nanofiber
Packaging	5g/10g

Case Study

Bio-Functionalized SiO2 Nanofibers Reinforced Perfluorosulfonic Acid Membrane for Proton Exchange Membrane Fuel Cells

Wang, Hang, et al. Journal of Power Sources, 2017, 340, 201-209.

The production of Bio-SiO2 nanofibers involved the attachment of four different amino acids to SiO2 nanofibers. The incorporation of Bio-SiO2 nanofibers into the perfluorosulfonic acid membrane matrix produced a composite membrane with uninterrupted proton conduction channels. The membrane's conductivity levels showed significant dependency on the presence of proton acceptors and donors within amino acids along with their H+ binding and dissociation capabilities. Incorporating Bio-SiO2 nanofibers into the membrane composite resulted in improved proton conductivity along with better dimensional stability and methanol permeability.
Preparation of the biofunctional SiO2 nanofiber
The fabrication of biofunctional SiO2 nanofibers required a two-step process which included carboxyl modification followed by amino acid functionalization. The introduction of carboxyl groups to SiO2 nanofibers occurred through suspension in a DMF solution with equal amounts of APTES and succinic anhydride followed by vigorous stirring for 3 hours.
The carboxyl-modified nanofibers (SiO2-Car) underwent an ethanol washing process. Amino acid grafting became possible after activating SiO2-Car in MES buffer with EDC and NHS. Following the removal of excess reagents SiO2-Car experienced individual immersion in MES solutions with cysteine, serine, lysine, or glycine and agitation at room temperature for 4 hours. Researchers successfully synthesized four final products: SiO2-Cys, SiO2-Ser, SiO2-Lys, and SiO2-Gly.

Multifunctional SiC@SiO2 Nanofiber Aerogel Developed as Cutting-Edge Ceramic Material

Song, Limeng, et al. Nano-Micro Letters, 2022, 14(1), 152.

A multifunctional SiC@SiO2 nanofiber aerogel (SiC@SiO2 NFA) with a three-dimensional (3D) porous cross-linked structure has been effectively developed. This research preliminarily verified its potential uses as elastic components, efficient oil/water absorbents, piezoresistive pressure sensors, and advanced electromagnetic wave absorbers in extreme conditions.
• Preparation of SiC@SiO2 Nanofiber Aerogel
Initially, a mixture of activated carbon and CaCO3 (in a 1:1 molar ratio) was subjected to ball milling at 300 rpm for 5 hours. In parallel, a silicon source, consisting of SiO2 and Si nanoparticles (also in a 1:1 molar ratio), underwent the same ball-milling process. Next, the mixtures of C/CaCO3 and Si/SiO2 were placed into graphite crucibles and heated at 1500°C for 5 hours in an argon (Ar) atmosphere to produce SiC nanofiber aerogels (SiC NFA). After cooling, the crucible was removed. The SiC NFA was then exfoliated by calcining the aerogel-coated graphite lid in air at 700°C for 2 hours. Finally, the aerogel underwent further calcination at 1100°C for 30 minutes to oxidize SiC, resulting in the final SiC@SiO2 NFA.
• Performance of SiC@SiO2 Nanofiber Aerogel
The SiC@SiO2 NFA features an incredibly low density (~11 mg cm^-3), along with remarkable elasticity, fatigue resistance, and heat resistance. It also exhibits high-temperature thermal stability and insulation properties, in addition to a strain-dependent piezoresistive sensing capability. The aerogel achieves impressive electromagnetic wave absorption, recording a minimum reflection loss (RLmin) of -50.36 dB and a maximum effective absorption bandwidth (EABmax) of 8.6 GHz.