Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/9104
Title: Internal surface electric charge characterization of mesoporous silica
Authors: Şen, Tümcan
Barışık, Murat
Issue Date: 2019
Publisher: Nature Publishing Group
Abstract: Mesoporous silica is an emerging technology to solve problems of existing and to support projected revolutionary applications ranging from targeted drug delivery to artificial kidney. However, one of the major driving mechanisms, electric charging of internal mesoporous surfaces, has not been characterized yet. In the nanoscale confinements of mesoporous structures made of pore throats and pore voids, surface charges diverge from existing theoretical calculations and show local variation due to two occurrences. First, when the size of pore throat becomes comparable with the thickness of ionic layering forming on throats' surfaces, ionic layers from opposite surfaces overlap so that ionic concentration on the surface becomes different than Boltzmann distribution predicts, and there will no longer be an equilibrium of zero electric potential at pore throat centers. Second, when this non zero potential inside throats becomes different than the potential of pore voids, ionic diffusion from void to throat creates axial ionic variation on surfaces. For such a case, we performed a pore level analysis on mesoporous internal surface charge at various porosities and ionic conditions. Pore parameters strongly affected the average internal charge which we characterized as a function of overlap ratio and porosity, first time in literature. Using this, a phenomenological model was developed as an extension of the existing theory to include nano-effects, to predict the average mesoporous internal surface charge as a function of EDL thickness, pore size and porosity.
Description: PubMed: 30644430
URI: https://doi.org/10.1038/s41598-018-36487-w
https://hdl.handle.net/11147/9104
ISSN: 2045-2322
Appears in Collections:Mechanical Engineering / Makina Mühendisliği
PubMed İndeksli Yayınlar Koleksiyonu / PubMed Indexed Publications Collection
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

Files in This Item:
File SizeFormat 
s41598-018-36487-w.pdf1.78 MBAdobe PDFView/Open
Show full item record



CORE Recommender

SCOPUSTM   
Citations

19
checked on Mar 2, 2024

WEB OF SCIENCETM
Citations

18
checked on Feb 10, 2024

Page view(s)

494
checked on Feb 26, 2024

Download(s)

128
checked on Feb 26, 2024

Google ScholarTM

Check




Altmetric


Items in GCRIS Repository are protected by copyright, with all rights reserved, unless otherwise indicated.