Fojan, Peter

Gurevich, Leonid

Jensen, Kasper Risgaard

Jensen, Rasmus Lund

English

    Aalborg UniversitetSurface Characterization of Coated and Uncoated Float GlassJensen, Kasper Risgaard; Fojan, Peter; Jensen, Rasmus Lund; Gurevich, LeonidPublished in:International Summer School on Application of Scanning Probe Microscopy in Life Sciences, Soft Matter andNanofabricationPublication date:2013Document VersionEarly version, also known as pre-printLink to publication from Aalborg UniversityCitation for published version (APA):Jensen, K. R., Fojan, P., Jensen, R. L., & Gurevich, L. (2013). Surface Characterization of Coated and UncoatedFloat Glass. In International Summer School on Application of Scanning Probe Microscopy in Life Sciences, SoftMatter and Nanofabrication River Publishers.General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright ownersand it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.            ? Users may download and print one copy of any publication from the public portal for the purpose of private study or research.            ? You may not further distribute the material or use it for any profit-making activity or commercial gain            ? You may freely distribute the URL identifying the publication in the public portal ?Take down policyIf you believe that this document breaches copyright please contact us at vbn@aub.aau.dk providing details, and we will remove access tothe work immediately and investigate your claim.Downloaded from vbn.aau.dk on: December 27, 2020Surface Characterization of Coated and Uncoated Float Glass Kasper Weirum Risgaard1, Peter Fojan1, Rasmus Lund Jensen2, and Leonid Gurevich1* 1) Department of Physics and Nanotechnology, Aalborg University, Aalborg, Denmark 2) Department of Civil Engineering, Aalborg University, Aalborg, Denmark *) E-mail: lg@nano.aau.dk  Surface coating on float glass has become standard in the production of window panes, where especially low-emission coatings are used to reduce the radiative heat loss through the windows. However, coatings may also be utilized to control the formation of condensation on the window panes [1]. In this respect we have determined the effect of two different silane coatings on the float glass hydrophilicity/hydrophobicity and on the surface roughness, as these parameters affects the condensation [2]. Hence, we have measured the advancing and receding water contact angles (CA) by the sessile drop method and the RMS surface roughness by atomic force microscopy (AFM). The silane coatings used were (3-aminopropyl)trimethoxysilane (APTMS) and 1H,1H,2H,2H-Perfluorodecyltriethoxysilane (PFTES) deposited by chemical vapour deposition. Initially, the two sides of the uncoated float glass were examined and no differences in CA and RMS surface roughness were observed, as can be observed in Table 1 showing that they were both hydrophilic. However, the sides can be distinguished by the fact that small indentations are observed in the AFM images (Figure 1) on only one side. Furthermore, energy dispersive X-ray spectroscopy revealed that this side of the glass contained trace amounts of tin, whereas the other side did not (data not shown). In the production of float glass the molten glass floats on a bath of molten tin to form a level surface, and it is hypothesized that the tin on the one side may be deposited during this production step and furthermore the indentations may also be caused by the tin bath.   Coating of the glass with APTMS renders the glass more hydrophobic, though the receding contact angle is not increased significantly as compared to the uncoated glass. The surface roughness is, however, observed to increase dramatically. Coating of the glass with PFTES renders the glass even more hydrophobic, whereas the surface roughness does not increase as much. It may therefore be concluded that the two silane coatings can be used for manipulation of surface wettability and roughness of float glass. However, the durability of the coatings needs to be tested.  Table 1: Surface characteristics of uncoated and silane coated float glass. Sample Advancing / Receding Contact Angle [°] RMS Roughness [nm] Uncoated, air side 28±6  / 7±2 0.4 ± 0.3 Uncoated, tin side 24±3  / 6±2 0.7 ± 0.4 APTMS coated, tin side 47±4  / 11±7 36.3 ± 16.0 PFTES coated, tin side 105±1  / 84±1 6.8 ± 1.4          Figure 1: AFM images of float glass. a) Air side of uncoated glass. b) Tin side of uncoated glass. c) Tin side of APTMS coated glass. d) Tin side of PFTES coated glass.  References. [1] A. Werner, A. Roos, Sol. Energy Mater. Sol. Cells 91, 609-615 (2007). [2] K. R. Jensen, P. Fojan, R. L. Jensen, L. Gurevich, J. Nanosci. Nanotechnol. 14, In Press (2014).   15.00 0.00 15.00 0.00 200.00 0.00 60.00 0.00b) c) d) a) 

Surface Characterization of Coated and Uncoated Float Glass

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Surface Characterization of Coated and Uncoated Float Glass

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