(a) fumed (pyrogenic) silica (opened fractal-like aggregates), (b) precipitated silica (compact fractal-like aggregates), (c) silica gel (compact and microporous fractal-like aggregates) and (d)...

2021年3月1日 · In this study, the shape of the aggregate of fumed silica was confirmed by a method of characterizing the morphology of the particles using transmission electron microscopy (TEM). Each aggregate was classified into four types—linear, branched, ellipsoidal, and spheroidal—and the shape distribution of a fumed-silica slurry was investigated ...

2005年9月15日 · Features of the flame synthesis and the nature of amorphous nanosilica result in certain generic characteristics of fumed oxides that are based on silica, such as (i) a roughly spherical shape of nonporous primary nanoparticles (average size d = 5 – 50 nm ∼ 1 / S BET); (ii) stepwise structural hierarchy of primary particles, their ...

2011年10月1日 · The utilization of fumed alumina could significantly improve thermal stability of the composites. When 5 wt.% fumed alumina was added, the volume shrinkage decreased from 10.49% to 3.47% at 1000 °C. The desirable results would be achieved by adjusting the amount of fumed alumina according to practical using temperature.

AEROSIL® fumed silica Evonik manufactures AEROSIL® fumed silica utilizing a fl ame hydrolysis reaction. Silicon tetrachloride, oxygen and hydrogen are fed continuously through a fl ame above 1000 °C to produce amorphous silicon dioxide of very high purity. Temperature and dwell time are controlled to

2020年7月2日 · The comparative analysis of atomic structure and morphology of fumed silica nanoparticles prepared under different synthesis conditions has been carried out using TEM, FTIR, quantum chemistry,...

Download scientific diagram | Typical TEM image of the fumed silica used in the research; molecular structure of phenyltrimethoxysilane; and illustration of the chemistry of fumed silica...

2023年8月22日 · A series of experiments were conducted on the HFS-dispersing technology in this study. The size and structure of HFS primary particles were observed via transmission electron microscopy (TEM). The measurement results of the TEM were D50 = 13.6 nm and D90 = 19.7 nm, respectively.

2024年4月25日 · Fumed Silica, also known as pyrogenic silica, is a fluffy, amorphous white powder composed of 96-99.8% SiO2, 0.05-1.3% Al2O3, 0.003-0.06% Fe2O3 and 0.03% TiO2. It has a high specific surface area (200-390 m2/g), nanoscale primary particle size(5-40nm) and a relatively high density of surface silanol groups (1.5-4.51/nm2).

Structural and Thermal Stability of Polycarbonate Decorated Fumed Silica Nanocomposite via Thermomechanical Analysis and In-situ Temperature Assisted SAXS