Tailoring the size and microporosity of Stöber silica particles

Kurdyukov, D. A.; Eurov, D. A.; Kirilenko, D. A.; Соколов, В. В.; Голубев, В. Г.

doi:10.1016/j.micromeso.2017.09.017

Cited by 42 publications

(25 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For example, porous silica particles find widescale application as catalyst supports (also in nanocomposite catalysts), adsorbents, molecular sieves, chemical sensors, etc. [9][10][11][12][13]. Recent research also found mesoporous silica particles to be very promising medical drug carriers [14].…”

Section: Numerousmentioning

confidence: 99%

Porosity determination of nano- and sub-micron particles by single particle inductively coupled plasma mass spectrometry

Kéri

Sápi

Ungor

et al. 2020

J. Anal. At. Spectrom.

View full text Add to dashboard Cite

show abstract

Section: Numerousmentioning

confidence: 99%

Porosity determination of nano- and sub-micron particles by single particle inductively coupled plasma mass spectrometry

Kéri

Sápi

Ungor

et al. 2020

J. Anal. At. Spectrom.

View full text Add to dashboard Cite

show abstract

“…Other, indirect measurements of the density of silica nanoparticles [22] also differ significantly from the values reported here. This could be the result of nonidentical synthesis conditions and postsynthesis treatment by different manufacturers, which can have a large effect on final particle porosity [40,41].…”

Section: Effectmentioning

confidence: 99%

Precision Mass and Density Measurement of Individual Optically Levitated Microspheres

et al. 2019

View full text Add to dashboard Cite

We report an in situ mass measurement of approximately-4.7-µm-diameter, optically levitated microspheres with an electrostatic co-levitation technique. The mass of a trapped, charged microsphere is measured by holding its axial (vertical) position fixed with an optical feedback force, under the influence of a known electrostatic force. A mass measurement with 1.8% systematic uncertainty is obtained by extrapolating to the electrostatic force required to support the microsphere against gravity in the absence of optical power. In three cases, the microspheres are recovered from the trap on a polymer-coated silicon beam and imaged with an electron microscope to measure their radii. The simultaneous precision characterization of the mass and radius of individual microspheres implies a density of 1.55 ± 0.08 g/cm 3 . The ability to recover individual microspheres from an optical trap opens the door to further diagnostics.

show abstract

“…in the range of 0.05-0.13 cm 3 /g. 31,40,41,44 Other authors measured much larger accessible volumes, e.g. 0.23 cm 3 /g from CO 2 isotherms 54 and 0.32 cm 3 /g from spin-echo small-angle neutron scattering.…”

Section: Water Adsorption Isothermsmentioning

confidence: 99%

Direct Measurement of Microporosity and Molecular Accessibility in Stöber Spheres by Adsorption Isotherms

et al. 2018

View full text Add to dashboard Cite

The microporous nature of monodisperse Stöber silica spheres is demonstrated in the literature, although usually via indirect evidence. Contradictorily, there also exist numerous reports of nonporosity based on conventional N 2 adsorption isotherms, leading to a confusing scenario and questioning the evaluation methodology. Thus, there is the strong need of straight measure of microporosity in Stöber spheres, at best by available adsorption techniques, which must be further directly confronted with the standard nitrogen method. Here, for the first time, microporosity detection by N 2 and CO 2 adsorption are compared in Stöber spheres. We demonstrate that CO 2 isotherms at 273 K allows direct detection and quantification of the microporosity (about 0.1 cm 3 /g in our samples), while N 2 at 77 K cannot probe adequately the internal volume. We also show that a large amount of water fills the micropores under usual ambient conditions, also revealing the presence of small mesoporosity. Thus, the porous nature of Stöber spheres is investigated by a simple combination of adsorption isotherms, and the different accessibility of N 2 , CO 2 and H 2 O molecules are discussed. We emphasize the inadequacy of standard N 2 isotherms for micropore detection in Stöber silica, as the access of nitrogen molecules at cryogenic temperatures is kinetically restricted and may lead to erroneous 2 conclusions. Instead, we propose CO 2 isotherms as a simple and direct means for evaluation of microporosity.

show abstract

Tailoring the size and microporosity of Stöber silica particles

Cited by 42 publications

References 31 publications

Porosity determination of nano- and sub-micron particles by single particle inductively coupled plasma mass spectrometry

Porosity determination of nano- and sub-micron particles by single particle inductively coupled plasma mass spectrometry

Precision Mass and Density Measurement of Individual Optically Levitated Microspheres

Direct Measurement of Microporosity and Molecular Accessibility in Stöber Spheres by Adsorption Isotherms

Contact Info

Product

Resources

About