Uncured silicone sealant surface energy as determined by contact angle measurements: A new quantitative tool for the assessment of sealant ease of use

2014 ◽  
pp. 327-340
Keyword(s):  
Contact Angle ◽  
Surface Energy ◽  
Ease Of Use ◽  
Silicone Sealant ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Quantitative Tool

scholarly journals Tailoring the Composition and Properties of Sprayed CuSbS2Thin Films by Using Polymeric Additives

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Ionut Popovici ◽  
Anca Duta
Keyword(s):  
Thin Films ◽  
Contact Angle ◽  
Ir Spectroscopy ◽  
Surface Energy ◽  
Hydrophilic Polymers ◽  
Film Morphology ◽  
Angle Measurements ◽  
Polymeric Additives ◽  
Contact Angle Measurements ◽  
Spray Pyrolysis Deposition

CuSbS2thin films were obtained by spray pyrolysis deposition, using polymeric additives for controlling the surface properties and film’s composition. Ternary crystalline chalcostibite compounds have been obtained without any postdeposition treatments. XRD spectra and IR spectroscopy were used to characterize films composition and interactions between components. Films morphology and surface energy were investigated using AFM microscopy and contact angle measurements. Hydrophobic and hydrophilic polymers strongly influence the composition and film morphology.

scholarly journals Cell Morphology on Poly(methyl methacrylate) Microstructures as Function of Surface Energy

2019 ◽  
Vol 2019 ◽  
pp. 1-12
Author(s):  
Matthias Katschnig ◽  
Boris Maroh ◽  
Natascha Andraschek ◽  
Sandra Schlögl ◽  
Ulrike Zefferer ◽  
...  
Keyword(s):  
Contact Angle ◽  
Cell Adhesion ◽  
Surface Energy ◽  
Methyl Methacrylate ◽  
Cell Elongation ◽  
Cell Phenotype ◽  
Critical Surface ◽  
Poly Methyl Methacrylate ◽  
Angle Measurements ◽  
Contact Angle Measurements

Whilst the significance of substrate topography as a regulator of cell function is well established, a systematic analysis of the principles underlying this is still unavailable. Here we evaluate the hypothesis that surface energy plays a decisive role in substrate-mediated modulation of cell phenotype by evaluation of cell behaviour on synthetic microstructures exhibiting pronounced differences in surface energy. These microstructures, specifically cubes and walls, were fabricated from a biocompatible base polymer, poly(methyl methacrylate), by variotherm injection molding. The dimensions of the cubes were 1 μm x 1 μm x 1 μm (height x width x length) with a periodicity of 1:1 and 1:5 and the dimensions of the walls 1 μm x 1 μm x 15 mm (height x width x length) with a periodicity of 1:1 and 1:5. Mold inserts were made by lithography and electroplating. The surface energy of the resultant microstructures was determined by static contact angle measurements. Light scanning microscopy of the morphology of NT2/D1 and MC3T3-E1 preosteoblast cells cultured on structured PMMA samples in both cases revealed a profound surface energy dependence. “Walls” appeared to promote significant cell elongation, whilst a lack of cell adhesion was observed on “cubes” with the lowest periodicity. Contact angle measurements on walls revealed enhanced surface energy anisotropy (55 mN/m max., 10 mN/m min.) causing a lengthwise spreading of the test liquid droplet, similar to cell elongation. Surface energy measurements for cubes revealed increased isotropic hydrophobicity (87° max., H2O). A critical water contact angle of ≤ 80° appears to be necessary for adequate cell adhesion. A “switch” for cell adhesion and subsequently cell growth could therefore be applied by, for example, adjusting the periodicity of hydrophobic structures. In summary cell elongation on walls and a critical surface energy level for cell adhesion could be produced for NT2/D1 and MC3T3-E1 cells by symmetrical and asymmetrical energy barrier levels. We, furthermore, propose a water-drop model providing a common physicochemical cause regarding similar cell/droplet geometries and cell adhesion on the investigated microstructures.

Estimation of casein micelles' surface energy by means of contact angle measurements

1989 ◽  
Vol 56 (2) ◽  
pp. 223-234 ◽  
Author(s):  
Michel Britten ◽  
Marcel Boulet ◽  
Paul Paquin
Keyword(s):  
Contact Angle ◽  
Surface Energy ◽  
Potential Energy ◽  
Short Range ◽  
Casein Micelle ◽  
Casein Micelles ◽  
Surface Energies ◽  
Angle Measurements ◽  
Heat Treated ◽  
Contact Angle Measurements

SummaryThe surface energies of highly hydrated casein micelle layers isolated from variously pretreated skim milks have been determined by means of contact angle measurements. The long range Lifshitz-Van der Waals (LW) and the short range hydrogen bonding (SR) components of surface energy were determined using α-bromonaphthalene and water for contact angle measurements. Casein micelles isolated from untreated and heat treated milks showed similar surface energy values of about 63·5 mJ.m-2 with an LW component of 19·2 mJ.m-2 and an SR component of 44·3 mJ.m-2. The calculated attraction potential energy was − 0·7 mJ.m-2. Casein micelles isolated from renneted milk showed a surface energy of 33·0 mJ.m-2 with an LW component of 30·7 mJ.m-2 and an SR component of 2·3 mJ.m-2. The attraction potential energy of renneted micelles was nearly two orders of magnitude higher than those of micelles from other milks ( − 63·3 mJ.m-2). The SR component of interfacial energy accounted for 98% of this attraction potential. The importance of attractive forces in relation to casein micelle stability is discussed.

Medical Polyurethane Covered by Diglyme Plasma Polymer

2014 ◽  
Vol 805 ◽  
pp. 89-93
Author(s):  
Rogério Pinto Mota ◽  
Roberto Y. Honda ◽  
Konstantin Georgiev Kostov ◽  
Milton E. Kayama ◽  
Mauricio A. Algatti ◽  
...  
Keyword(s):  
Contact Angle ◽  
Refractive Index ◽  
Surface Energy ◽  
Film Thickness ◽  
Polyethylene Oxide ◽  
Plasma Polymerization ◽  
Film Structure ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Acids And Bases

Plasma polymerized diglyme (pp-diglyme) is a promising class of biomedical materials due to hydrophilic features when deposited under excitation by RF low power. In order to reach this goal this paper deals with plasma polymerization of diethylene-glycoldimethyl-ether (diglyme here after) by RF-excited plasmas under power ranging from 5 to 20 W and pressure of 6.6 Pa. Films were deposited on glass and aqueous polyurethane dispersion substrates (PUD). For the values of RF used in this paper, film thickness varied from 51 nm to 64 nm. Such films were deposited on flexible biocompatible polyurethane that is not resistant to acids and bases as plasma polymerized diglyme. The recovering of these materials with pp-diglyme films let them with a resistant biocompatible feature that is appropriate for use in aggressive environments. The contact angle measurements show the variation from 56° to 64° for a surface energy which varies from 68 mJ/m2to 59 mJ/m2, respectively. The FTIR data show that the main functional groups in the polymeric film structure are C-H (3000 cm-1to 2900 cm-1), C-O-C and C-O (1200 cm-1to 900 cm-1) similar to the polyethylene oxide (PEO) structure. The refractive index results show a variation from 1.58 to 1.63.

The diamond-solution interface: the surface energy of hydrogen terminated nanocrystalline CVD diamond derived from contact angle measurements

2011 ◽  
Vol 1362 ◽  
Author(s):  
Stoffe D. Janssens ◽  
Sien Drijkoningen ◽  
Marc Saitner ◽  
Hans-Gerd Boyen ◽  
Ken Haenen ◽  
...  
Keyword(s):  
Contact Angle ◽  
Surface Energy ◽  
Photoelectron Spectroscopy ◽  
Microwave Plasma ◽  
Sessile Drop ◽  
Chemical Vapor ◽  
Nanocrystalline Diamond ◽  
Silicon Substrates ◽  
Angle Measurements ◽  
Contact Angle Measurements

ABSTRACTIn this work, a determination of the surface energy for hydrogen terminated nanocrystalline diamond grown with microwave plasma enhanced chemical vapor deposition is presented. Five identical hydrogen terminated nanocrystalline diamond layers of ~150 nm thick are deposited on silicon substrates and examined with X-ray photoelectron spectroscopy to determine the surface groups and possible surface contaminations. In order to evaluate the surface energy, contact angle measurements are performed using the sessile drop method in combination with data analysis based on the ‘Owens, Wendt, Rabel and Kaelble’ method. Four different experimental approaches to evaluate the surface energy of hydrogen terminated nanocrystalline diamond are discussed.

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