Plasma Hydrophilization of Superhydrophobic Surface and Its Aging Behavior: The Effect of Micro/nanostructured Surface

Wang

J of Applied Polymer Sci

et al. 2018

Polyethylene (PE) has many excellent material properties (low density, high flexibility, good chemical resistance, etc.), and is widely used in industrial and medical fields. However, the practical applications of PE are sometimes limited due to its poor wettability. In this article, we employ pure nitrogen atmospheric pressure plasma jet (APPJ) and N 2 -H 2 O APPJ to hydrophilize PE surfaces. Wettability, time stability, chemical composition, micromorphology, and mechanical properties of the treated surfaces are investigated by contact angle measurement, X-ray photoelectron spectroscopy, atomic force microscopy, scanning electron microscopy, and electric digital display push-pull machine. The pure nitrogen APPJ can hydrophilize PE surfaces without inducing obvious microstructure changes, and relatively better wettability (water contact angle = 13 ) could thereby be achieved. On the other hand, the N 2 -H 2 O APPJ creates micro/nanoscale pores on the treated hydrophilic surfaces, contributing to the better time stability and lower tensile strength. The results reported here clearly demonstrate the great potential of nitrogen APPJs with different water mixing ratios in controlling surface wettability and microstructures of polymer surfaces.

Section: Resultsmentioning

confidence: 99%

“…Compared with the surface treated by MR0% plasma jet that treated by MR2% plasma jet has more micro/nanostructures. The micro/nanostructures along with crosslinks induced by plasma tend to hinder the reorientation and migration process, and the time stability is therefore better.…”

Section: Resultsmentioning

confidence: 99%

Influence of water addition on the modification of polyethylene surface by nitrogen atmospheric pressure plasma jet

Wang

J of Applied Polymer Sci

et al. 2018

ACS Appl. Mater. Interfaces

“…Thus, the interaction of the water-insoluble analytes with the metallic surface could be improved, and the SERS signal could be further amplified because more molecules are in the near field of the plasmonic surface. Consequently, a number of research studies have been published to generate hydrophobic surfaces. ,− One common surface functionalization to achieve hydrophobic surfaces is by combining micro/nanostructures using top-down techniques, such as lithography and plasma treatment. ,− However, these techniques require complex preparation steps and are often expensive and time consuming. The hierarchically-designed 3D flower-like silica–silver composite nanostructures presented in this study not only function as SERS templates but also provide highly hydrophobic surfaces, which were investigated through contact angle measurements of the nonmetalized composite nanostructure (135 PE-ALD cycles) and the 50 nm silver metallized composite nanostructure depicted in Figure b.…”

Section: Resultsmentioning

confidence: 99%

Hierarchically-Designed 3D Flower-Like Composite Nanostructures as an Ultrastable, Reproducible, and Sensitive SERS Substrate

Yüksel

Ziegler

Goerke

et al. 2017

Surface-enhanced Raman spectroscopy (SERS) is an attractive tool in the analytical sciences due to its high specificity and sensitivity. Because SERS-active substrates are only available as two-dimensional arrays, the fabrication of three-dimensional (3D) nanostructures allows for an increased number of hot spots in the focus volume, thus further amplifying the SERS signal. Although a great number of fabrication strategies for powerful SERS substrates exist, the generation of 3D nanostructures with high complexity and periodicity is still challenging. For this purpose, we report an easy fabrication technique for 3D nanostructures following a bottom-up preparation protocol. Enzymatically generated silver nanoparticles (EGNPs) are prepared, and the growth of hierarchically-designed 3D flower-like silica-silver composite nanostructures is induced by applying plasma-enhanced atomic layer deposition (PE-ALD) on the EGNPs. The morphology of these nanocomposites can be varied by changes in the PE-ALD cycle number, and a flower height of up to 10 μm is found. Moreover, the metallized (e.g., silver or gold) 3D nanostructures resulting from 135 PE-ALD cycles of silica creation provide highly reproducible SERS signals across the hydrophobic surface. Within this contribution, the morphological studies, optical properties, as well as the SERS response of these metallized silica-silver composite nanostructures applying vitamin B2 as a model analyte are introduced.

“…Some scientific papers present some tests using the gaseous mixtures (Ar/O 2 and He/O 2 ) plasma activation of polyester (PES) or poly (ethylene terephthalate) fabrics to improve the hydrophilic and aging effects [ 25 , 26 , 27 ]. The material’s surface becomes hydrophilic using plasma O 2 activation due to the formation of polar groups (C=O, O-C=O) on the surface [ 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

“…Figure28. 3D representation RESD after crosslinking = f(Pv, δ) samples preliminarily treated in RF plasma O2 using RF1 generator and power 200 W.…”

mentioning

confidence: 99%

Multivariate Correlation Analysis of the Electroconductive Textiles Obtained Using Functionalization by Radio-Frequency Oxygen Plasma Treatments

et al. 2021

This paper presents a study concerning the preliminary treatments in radiofrequency (RF)oxygen (O2) plasma used to obtain a hydrophilic effect on raw cotton fabrics followed by electroconductive thin film deposition to obtain electroconductive textile surfaces. In addition, this study presents a multivariate correlation analysis of experimental parameters. The treatment using RF plasma O2 aimed to increase the hydrophilic character of the raw fabric and adherence of paste-based polymeric on polyvinyl alcohol (PVA) matrix and nickel (Ni), silver (Ag) or copper (Cu) microparticles. The purpose of the research was to develop electroconductive textiles for flexible electrodes, smart materials using a clean technology such as radiofrequency (RF) plasma O2 to obtain a hydrophilic surface with zero wastewater and reduced chemicals and carbon footprint. To achieve the foreseen results, we used advanced functionalization technologies such as RF plasma O2, followed by scraping a thin film of conductive paste-based Ni, Ag or Cu microparticles, and multivariate correlation methods to observe the dependence between parameters involved (dependent and independent variables). Overall, the fabrics treated in plasma with O2 using a kHz or MHz generator and power 100–200 W present an excellent hydrophilic character obtained in 3 min. After RF O2 plasma functionalization, a thin film based on polymeric matrix PVA and Ni microparticles have been deposited on the fabric surface to obtain electroconductive materials.