Next Article in Journal
Corrosion Testing of Thermal Spray Coatings in a Biomass Co-Firing Power Plant
Next Article in Special Issue
Study of a Particle Based Films Cure Process by High-Frequency Eddy Current Spectroscopy
Previous Article in Journal
Fabrication of Microalloy Nitrided Layer on Low Carbon Steel by Nitriding Combined with Surface Nano-Alloying Pretreatment
Previous Article in Special Issue
Cylindrical Three-Dimensional Porous Anodic Alumina Networks
Article Menu
Issue 4 (December) cover image

Export Article

Open AccessArticle
Coatings 2016, 6(4), 64; doi:10.3390/coatings6040064

Structural Study of Silica Coating Thin Layers Prepared from Perhydropolysilazane: Substrate Dependence and Water Penetration Structure

1
ART KAGAKU Co., Ltd., 3135-20 Muramatsu, Tokai, Ibaraki 319-1112, Japan
2
Comprehensive Research Organization for Science and Society (CROSS), 162-1 Shirakata, Tokai, Ibaraki 319-1106, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Massimo Innocenti
Received: 18 September 2016 / Revised: 10 November 2016 / Accepted: 16 November 2016 / Published: 19 November 2016
(This article belongs to the Special Issue Advances in Coatings Characterization)
View Full-Text   |   Download PDF [1728 KB, uploaded 19 November 2016]   |  

Abstract

The structure of perhydropolysilazane (PHPS)-derived silica (PDS) waterproof thin layers synthesized by curing at 60 °C for 1 h and allowed to stand for 48 h at 20 °C on various kinds of substrates was studied. Neutron reflectivity (NR) analysis suggested that uniform PDS thin layers were synthesized on the substrates, and the density of the layers varied depending on the type of substrate. Additionally, since the change in PDS density is correlated with the pKa value of the OH group on the substrate, it can be suggested that the acidity of the substrate would be one of the main factors determining the density of the coated PDS thin layers. For the water penetration structure study, NR analysis revealed that the depth of water penetration into the PDS layers was below 500 Å, and the hydration number of the SiO2 molecule was estimated to be 8.0–9.0. From these results, we concluded that water penetration occurred by the formation of water-pool structures in the PDS layers, and the randomly formed nano-air holes lead to a reduction in the probability of water penetration into the deep regions of the PDS layers. View Full-Text
Keywords: perhydropolysilazane; neutron reflectivity; water penetration perhydropolysilazane; neutron reflectivity; water penetration
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Niizeki, T.; Nagayama, S.; Hasegawa, Y.; Miyata, N.; Sahara, M.; Akutsu, K. Structural Study of Silica Coating Thin Layers Prepared from Perhydropolysilazane: Substrate Dependence and Water Penetration Structure. Coatings 2016, 6, 64.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Coatings EISSN 2079-6412 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top