
SEM and TEM images of different silica types. (a) fumed …
(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)...
Shape classification of fumed silica abrasive and its effects on ...
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 ...
Morphology and surface properties of fumed silicas
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 ...
Study of thermal stability of fumed silica based thermal insulating ...
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
Atomic Structure and Morphology of Fumed Silica - ResearchGate
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,...
Typical TEM image of the fumed silica used in the ... - ResearchGate
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...
Preparation and Dispersion Performance of Hydrophobic Fumed …
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.
Fumed Silica: Properties, Synthesis and Uses - ChemicalBook
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).
(a) TEM image of fumed silica Nanoparticles and (b) FESEM image …
Structural and Thermal Stability of Polycarbonate Decorated Fumed Silica Nanocomposite via Thermomechanical Analysis and In-situ Temperature Assisted SAXS