scholarly journals A Facile Activation Method for Improving the Wettability of Polyurethane Surfaces

2019 ◽  
Vol 56 (2) ◽  
pp. 416-420
Author(s):  
Luiza Madalina Gradinaru ◽  
Stelian Vlad ◽  
Mioara Drobota ◽  
Maria Spiridon ◽  
Ioan Istrate
Keyword(s):  
Contact Angle ◽  
Polymer Surface ◽  
Bulk Properties ◽  
Polar Interaction ◽  
Polar Groups ◽  
Angle Measurements ◽  
Static Contact ◽  
Contact Angle Measurements ◽  
Polyurethane Film ◽  
Time Periods

This work reports the activation of polyurethane film surfaces in order to enrich them with polar groups such as -NH2, -OH, -COOH or radicals, which further allows immobilization of several bioactive compounds. UV-activation was used to introduce new groups on the polymer surface without affecting the bulk properties. The current arising species improve the wettability of the PU surfaces as it was observed from the static contact angle measurements. The structure and composition of the new PU surfaces were analyzed by using ATR-FTIR spectroscopy. The results suggested the possibility of modifying the PU surfaces in a shorter time periods, in order to provide many sites to attach other biomacromolecules by polar interaction or hydrogen bonding.

scholarly journals Precise Static Contact Angle Measurements Using Pythagolas Rule

2014 ◽  
Vol 15 (2) ◽  
pp. 57-62
Author(s):  
Jin-Yeong Choi ◽  
Dong-Jun Kwon ◽  
Zuo-Jia Wang ◽  
Pyeong-Su Shin ◽  
Joung-Man Park
Keyword(s):  
Contact Angle ◽  
Static Contact Angle ◽  
Angle Measurements ◽  
Static Contact ◽  
Contact Angle Measurements

Vertically aligned CNT arrays: structural integrity and surface properties

2016 ◽  
Vol 7 (6) ◽  
pp. 703-711 ◽  
Author(s):  
Dimitris K. Perivoliotis ◽  
Malamatenia A. Koklioti ◽  
Elias P. Koumoulos ◽  
Yiannis S. Raptis ◽  
Costas A. Charitidis
Keyword(s):  
Contact Angle ◽  
Structural Integrity ◽  
Mechanical Performance ◽  
Content Type ◽  
Cvd Method ◽  
Angle Measurements ◽  
Hydrophobic Behavior ◽  
Static Contact ◽  
Contact Angle Measurements ◽  
Cnt Arrays

Purpose Carbon nanotube-based architectures have increased the scientific interest owning to their exceptional performance rendering them promising candidates for advanced industrial applications in the nanotechnology field. Despite individual CNTs being considered as one of the most known strong materials, much less is known about other CNT forms, such as CNT arrays, in terms of their mechanical performance. The paper aims to discuss these issues. Design/methodology/approach In this work, thermal CVD method is employed to produce VA-MWCNT carpets. Their structural properties were studied by means of SEM, XRD and Raman spectroscopy, while their hydrophobic behavior was investigated via contact angle measurements. The resistance to indentation deformation of VA-MWCNT carpets was investigated through nanoindentation technique. Findings The synthesized VA-MWCNTs carpets consisted of well-aligned MWCNTs. Static contact angle measurements were performed with water and glycerol, revealing a rather super-hydrophobic behavior. Originality/value The structural analysis, hydrophobic behavior and indentation response of VA-MWCNTs carpets synthesized via CVD method are clearly demonstrated.

scholarly journals Specific ion modulated thermoresponse of poly(N-isopropylacrylamide) brushes

2016 ◽  
Vol 18 (8) ◽  
pp. 6037-6046 ◽  
Author(s):  
Ben A. Humphreys ◽  
Joshua D. Willott ◽  
Timothy J. Murdoch ◽  
Grant B. Webber ◽  
Erica J. Wanless
Keyword(s):  
Contact Angle ◽  
Static Contact Angle ◽  
Angle Measurements ◽  
Static Contact ◽  
Contact Angle Measurements

Specific anion identity and concentration dictates the direction and magnitude of the shift in LCST for a pNIPAM brush determined by in situ ellipsometry, QCM-D and static contact angle measurements.

Modifications of Paper Surfaces with Composite SiOx/Polymer Coatings

2015 ◽  
Vol 731 ◽  
pp. 437-440
Author(s):  
Zhuang Liu ◽  
Lin Zhu ◽  
Zhi Hui Sun
Keyword(s):  
Contact Angle ◽  
Testing Machine ◽  
Composite Films ◽  
Chemical Characterization ◽  
Polymer Coatings ◽  
Tensile Testing Machine ◽  
Angle Measurements ◽  
Static Contact ◽  
Contact Angle Measurements ◽  
The Individual

The composite SiOx/polymer films are deposited as a top-coatings onto the paper substrates by radio frequency (RF) reactive magnetron co-sputtered two targets, silica and dicyclopentadiene dioxide cured with maleic anhydride (DCPD/MA).The samples prepared by changing PSiO2/PDCPD/MA, the ratio of RF powers density delivered to the individual target from 0.1 to 10 so as to prepare different SiOxcontent coatings. The wettability, mechanical properties, color reproduction printability, chemical characterization of the coatings are discussed in this paper, using contact angle measurements, electronic tensile testing machine, off-set printing test and FTIR. The static contact angle of water ranges from 129.7 to 90.7 o and tensile performance has improved significantly as the ratio of RF powers density change from 0.1 to 10. The ink density and depth of color during off-set printing are visually improved by using papers with hydrophobic surfaces coated composite films.

Rf Sputtering of Composite Fluorocarbon/ZnO Films and their Basic Properties

2008 ◽  
Vol 373-374 ◽  
pp. 159-162 ◽  
Author(s):  
Yu Hui Zhang ◽  
Quan Ji ◽  
Xue Wang
Keyword(s):  
Contact Angle ◽  
Composite Films ◽  
Rf Sputtering ◽  
Static Contact Angle ◽  
Zno Films ◽  
Angle Measurements ◽  
Static Contact ◽  
Contact Angle Measurements ◽  
Structure Surface ◽  
Uv Visible

Composite fluorocarbon/ZnO films were deposited by R.F. sputtering using polytetrafluoroethylene (PTFE) and Zn target on polyethylene terephthalate (PET) substrate. Argon was used as the working gas and oxygen as reacting gas. The obtained films were characterized by AFM, UV-visible spectrophotometer, XPS and static contact angle measurements. The composite films are islands-structure composed of nanometer particles. Surface of the islands is not flat. The static contact angle of water is larger than 90°, possessing excellent hydrophobicity. The composite films exhibit multi-enhanced ultraviolet absorption due to π-π-conjugated molecular structure, surface morphology and nano-sized ZnO absorbing effect.

Tuning the Surface Properties of Elastomers Using Hydrocarbon-Based Mechanically Assembled Monolayers

2001 ◽  
Vol 710 ◽  
Author(s):  
Kirill Efimenko ◽  
Jan Genzer
Keyword(s):  
Contact Angle ◽  
Fine Structure ◽  
Surface Structure ◽  
Surface Properties ◽  
Molecular Orientation ◽  
Angle Measurements ◽  
Static Contact ◽  
Contact Angle Measurements ◽  
Assembled Monolayers ◽  
Excellent Stability

ABSTRACTWe use static contact angle measurements and near-edge absorption fine structure to elucidate the surface structure and molecular orientation of hydrocarbon-based mechanically assembled monolayers (H-MAMs), structures formed by combination of assembly of alkyl moieties onto flexible elastomeric substrates and mechanical manipulation of the substrates. Specifically, we report that the organization of the grafted molecular array (“liquid”-like vs. solid-like) can be tailored by varying the degree of stretching of the elastomeric substrate. We also show that the H-MAM surfaces exhibit excellent stability.

Self-cleaning properties of polyester fabrics coated with flower-like TiO2 particles and trimethoxy (octadecyl)silane

2019 ◽  
Vol 50 (4) ◽  
pp. 543-565 ◽  
Author(s):  
Muhammad Zaman Khan ◽  
Vijay Baheti ◽  
Jiri Militky ◽  
Jakub Wiener ◽  
Azam Ali
Keyword(s):  
Contact Angle ◽  
Uv Light ◽  
Sol Gel ◽  
Titanium Isopropoxide ◽  
Polyester Fabrics ◽  
Angle Measurements ◽  
Static Contact ◽  
Contact Angle Measurements ◽  
Self Cleaning ◽  
Octadecyl Silane

The presented work reported the growth of 3D-shaped TiO2 flower particles on the surface of polyester fabrics using two step approaches of sol–gel technology and hydrothermal method. The scanning electron microscopy, EDS analysis, Raman spectroscopy, and X-ray diffraction techniques were employed to study the effect of titanium isopropoxide (TTIP) concentration on the growth of flower-like TiO2 microstructures. Later, a layer of trimethoxy(octadecyl)silane was applied on TiO2-coated polyester fabrics to fabricate the self-cleaning textiles. The physical self-cleaning properties were examined based on superhydrophobicity and contact angle measurements, where maximum static contact angle of 160.1o and minimum roll off angle of 3° was found for 2 mL TTIP concentration. The degradation of methyl orange dyes under UV light irradiation was observed to confirm the photocatalytic chemical self-cleaning behavior, where the samples coated with 2 mL TTIP decolorized the dye solution in 150 min, whereas the samples coated with 1 mL and 1.5 mL TTIP took almost 300 and 210 min, respectively.

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