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Outset of the Morph...
Outset of the Morphology of Nanostructured Silica Particles during Nucleation Followed by Ultrasmall-Angle X-ray Scattering
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- Schmitt, Julien (författare)
- Univ Paris Saclay, Univ Paris 11, CNRS, Phys Solides Lab, F-91400 Orsay, France.,The French National Centre for Scientific Research (CNRS),University of Paris-Saclay
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- Kjellman, Tomas (författare)
- Lund University,Lunds universitet,Fysikalisk kemi,Enheten för fysikalisk och teoretisk kemi,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Physical Chemistry,Physical and theoretical chemistry,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH
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- Kwasniewski, Pawel (författare)
- ESRF, Beamline ID2, 71 Ave Martyrs, F-38043 Grenoble, France.,European Synchrotron Radiation Facility
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- Meneau, Florian (författare)
- Synchrotron Soleil, SWING Beamline, BP 48, F-91192 Gif Sur Yvette, France.
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- Pedersen, Jan Skov (författare)
- Aarhus Univ, Dept Chem, DK-8000 Aarhus, Denmark.;Aarhus Univ, iNANO Interdisciplinary Nanosci Ctr, DK-8000 Aarhus, Denmark.,Aarhus University
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- Edler, Karen J. (författare)
- Univ Bath, Dept Chem, Bath BA2 7AY, Avon, England.,University of Bath
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- Rennie, Adrian R. (författare)
- Uppsala University,Uppsala universitet,Materialfysik
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- Alfredsson, Viveka (författare)
- Lund University,Lunds universitet,Fysikalisk kemi,Enheten för fysikalisk och teoretisk kemi,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Physical Chemistry,Physical and theoretical chemistry,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH
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- Imperor-Clerc, Marianne (författare)
- Univ Paris Saclay, Univ Paris 11, CNRS, Phys Solides Lab, F-91400 Orsay, France.,The French National Centre for Scientific Research (CNRS),University of Paris-Saclay
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Univ Paris Saclay, Univ Paris 11, CNRS, Phys Solides Lab, F-91400 Orsay, France The French National Centre for Scientific Research (CNRS) (creator_code:org_t)
- 2016-05-13
- 2016
- Engelska.
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Ingår i: Langmuir. - : American Chemical Society (ACS). - 0743-7463 .- 1520-5827. ; 32:20, s. 5162-5172
- Relaterad länk:
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http://dx.doi.org/10...
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visa fler...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://lup.lub.lu.s...
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Abstract
Ämnesord
Stäng
- Nucleation and growth of SBA-15 silica nanostructured particles with well-defined morphologies has been followed with time by small-angle X-ray scattering (SAXS) and ultrasmall-angle X-ray scattering (USAXS), using synchrotron radiation. Three different morphologies have been compared: platelets, toroids, and rods. SEM observations of the particles confirm that two key physical parameters control the morphology: the temperature and the stirring of the solution. USAXS curves demonstrate that primary particles with a defined shape are present very early in the reaction mixture, immediately after a very fast nucleation step. This nucleation step is detected at 10 min (56 degrees C) or 15 min (50 degrees C) after the addition of the silica precursor. The main finding is that the USAXS signal is different for each type of morphology, and we demonstrate that the difference is related to the shape of the particles, showing characteristic form factors for the different morphologies (platelet, toroid, and rod). Moreover, the size of the mesocrystal domains is correlated directly with the particle dimensions and shape. When stirred, aggregation between primary particles is detected even after 12 min (56 degrees C). The platelet morphology is promoted by constant stirring of the solution, through an oriented aggregation step between primary particles. In contrast, toroids and rods are only stabilized under static conditions. However, for toroids, aggregation is detected almost immediately after nucleation.
Ämnesord
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
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