scholarly journals Biomaterial Embedding Process for Ceramic–Polymer Microfluidic Sensors

Sensors ◽  
2020 ◽  
Vol 20 (6) ◽  
pp. 1745 ◽  
Author(s):  
Witold Nawrot ◽  
Karol Malecha
Keyword(s):  
Plasma Treatment ◽  
Anodic Bonding ◽  
Plasma Modification ◽  
Biochemical Processes ◽  
Angle Measurements ◽  
Plasma Activation ◽  
Microfluidic Sensors ◽  
Contact Angle Measurements ◽  
Novel Method ◽  
Sample Structure

One of the major issues in microfluidic biosensors is biolayer deposition. Typical manufacturing processes, such as firing of ceramics and anodic bonding of silicon and glass, involve exposure to high temperatures, which any biomaterial is very vulnerable to. Therefore, current methods are based on deposition from liquid, for example, chemical bath deposition (CBD) and electrodeposition (ED). However, such approaches are not suitable for many biomaterials. This problem was partially resolved by introduction of ceramic–polymer bonding using plasma treatment. This method introduces an approximately 15-min-long window for biomodification between plasma activation and sealing the system with a polymer cap. Unfortunately, some biochemical processes are rather slow, and this time is not sufficient for the proper attachment of a biomaterial to the surface. Therefore, a novel method, based on plasma activation after biomodification, is introduced. Crucially, the discharge occurs selectively; otherwise, it would etch the biomaterial. Difficulties in manufacturing ceramic biosensors could be overcome by selective surface modification using plasma treatment and bonding to polymer. The area of plasma modification was investigated through contact-angle measurements and Fourier-transform infrared (FTIR) analyses. A sample structure was manufactured in order to prove the concept. The results show that the method is viable.

scholarly journals Improved de-inking of inkjet-printed paper using environmentally friendly atmospheric pressure low temperature plasma for paper recycling

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Rodolphe Mauchauffé ◽  
Seung Jun Lee ◽  
Isaac Han ◽  
Sang Hyeong Kim ◽  
Se Youn Moon
Keyword(s):  
Plasma Treatment ◽  
Atmospheric Pressure ◽  
Paper Recycling ◽  
Temperature Plasma ◽  
Water Contact ◽  
Angle Measurements ◽  
Natural Energy ◽  
Contact Angle Measurements ◽  
Speed Up ◽  
Uv Visible

Abstract Nowadays, due to environmental pollution and natural energy consumption caused by waste paper, many researches are being conducted on the reuse of printed-paper. To recycle the paper, de-inking has to be performed. In this article, in order to reduce the use of the commonly used de-inking chemicals, the effect of an atmospheric pressure helium plasma treatment on the de-inking enhancement of printed-paper is studied. Through colorimeter and UV-visible spectrometer measurements the plasma treatment is shown to speed up the de-inking. While SEM observations and FTIR measurements suggest that the paper quality is retained upon plasma treatment, the increase of surface hydrophilicity measured by water contact angle measurements, compared to non-treated paper, is believed to enhance the fiber swelling of the paper and lead to a faster ink removal.

Surface Modification of Fluorosilicone Acrylate RGP Contact Lens by Low-Temperature Ammonia Plasma

2009 ◽  
Vol 610-613 ◽  
pp. 1273-1277 ◽  
Author(s):  
Li Ren ◽  
Lian Na Zhao ◽  
Shi Heng Yin ◽  
Ying Jun Wang ◽  
Hao Chen ◽  
...  
Keyword(s):  
Contact Angle ◽  
Low Temperature ◽  
Plasma Treatment ◽  
Contact Lens ◽  
Photoelectron Spectroscopy ◽  
Ammonia Plasma ◽  
Angle Measurements ◽  
Atomic Force ◽  
Contact Angle Measurements ◽  
Surface Contact Angle

In order to improve the surface hydrophilicity and the resistance to protein deposition of fluorosilicone acrylate RGP (rigid gas permeable) contact lens, low temperature ammonia plasma treatment was used to modify the lens surface. The changes of surface structures and properties were characterized by contact angle analyzer, X-ray photoelectron spectroscopy (XPS) and atomic force microscope (AFM). Effects of exposure time and plasma generating power on surface properties of the RGP contact lens were investigated. The surface contact angle measurements showed a great improvement of hydrophilicity after plasma treatment. XPS analysis indicated that the oxygen content and the nitrogen content increased remarkably after ammonia plasma treatment. Furthermore, the content of the hydrophilic group O-C=O/N-C=O on the surface increased and the content of the hydrophobic group CF2 decreased after plasma treatment. AFM results showed that ammonia plasma could lead to surface etching.

Effect of helium DBD plasma treatment on the surface of wood samples

Holzforschung ◽  
2010 ◽  
Vol 64 (2) ◽  
Author(s):  
Mihai Asandulesa ◽  
Ionut Topala ◽  
Nicoleta Dumitrascu
Keyword(s):  
Plasma Treatment ◽  
Linseed Oil ◽  
Dynamic Contact Angle ◽  
Optical Emission ◽  
Dynamic Contact ◽  
Dbd Plasma ◽  
Adhesion Properties ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Modified Surfaces

Abstract The effects of helium dielectric barrier discharge (He-DBD) plasma treatment has been studied aiming at the preparation of wood for profitable dye covering and impregnation with an antibacterial oil. Electrical and optical emission spectroscopy measurements were performed to characterise the He-DBD discharge. The hydrophilic/hydrophobic properties of the modified surfaces were studied by dynamic contact angle measurements. The spreading area of the wet spots was also evaluated as a function of wetting time. After He-DBD plasma exposure, the adhesion properties are substantially improved and the hydrophilic character of wood surface is enhanced. The behaviour of linseed oil drops on the modified surfaces confirmed the utility of He-DBD treatment.

scholarly journals Application of SEM Imaging and MLA Mapping Method as a Tool for Wettability Restoration in Reservoir Core Samples for SCAL Experiments

Minerals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 285
Author(s):  
Edison Sripal ◽  
David Grant ◽  
Lesley James
Keyword(s):  
Mapping Method ◽  
United States Bureau ◽  
Reservoir Temperature ◽  
Core Samples ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Wet Condition ◽  
Novel Method ◽  
Sem Imaging ◽  
Liberation Analysis

In reservoir engineering, special core analysis experiments (SCAL) are performed in the lab to evaluate the production capabilities of an oil reservoir. A critical component of SCAL experiments is core wettability restoration to its original wettability, i.e., oil wet condition. Typically, aging is performed by saturating the core with oil and aging at reservoir temperature where time is the variable in question dictating whether the resulting restored core is strongly or weakly oil-wet. In the lab, core wettability is often experimentally validated using contact angle measurements or USBM (United States Bureau of Mines) wettability tests, which are often time consuming, expensive and prone to error. In this study we developed a novel method by using Scanning Electron Microscope (SEM) and mineral liberation analysis (MLA) imaging (at low vacuum conditions) to determine the wettability of rocks saturated with reservoir fluids such as oil and brine. For this work a systematic approach was applied with comparing the SEM-MLA method against conventional methods to quantify the degree of uncertainty linked to a) wettability estimation and b) the aging time. We have used a comprehensive suite of core samples such as Berea, Silurian Dolomite and Chalk to represent the bulk of oil reservoirs in the world.

scholarly journals Hydrophilic Indicates Surface Morphology Quality of TiO2/CdS Nanocomposite Film

2015 ◽  
Vol 773-774 ◽  
pp. 701-705
Author(s):  
Ali Kamel Mohsin ◽  
Noriah Bidin ◽  
Kadhim A. Aadim
Keyword(s):  
Contact Angle ◽  
Surface Morphology ◽  
Nanocomposite Film ◽  
Microstructural Characterization ◽  
Oxide Semiconductor ◽  
Hydrophilic Property ◽  
Angle Measurements ◽  
Atomic Force ◽  
Contact Angle Measurements ◽  
Novel Method

Engineering and decoration on the surface of metal oxide semiconductor (TiO2) for increasing activity is challenging. Thus a novel method is introduced to determine surface morphology quality subsequently improving the photocatalytic behaviour. TiO2films are fabricated via laser deposition technique at various CdS thickness. Microstructural characterization and optical behaviours are characterized by felid emission scanning electron microscope (FE-SEM) and atomic force microscope (AFM). The hydrophilic property of TiO2/CdS nanocomposite film (NCF) is examined via contact angle measurements. The grain density is found linearly increased with the contact angle. A mutual relationship is revealed between hydrophilic property and crystallization with respect to the CdS thickness. Thus, surface morphology of nanocomposite quality is quantified based on the hydrophilic measurement

Effect of Oxygen Plasma Treatments on Polypropylene-Epoxy Interfacial Strength

1989 ◽  
Vol 153 ◽  
Author(s):  
E. Occhiello ◽  
M. Morra ◽  
G. Morini ◽  
F. Garbassi
Keyword(s):  
Surface Layer ◽  
Plasma Treatment ◽  
Oxygen Plasma ◽  
Interfacial Strength ◽  
Oxygen Plasma Treatment ◽  
Weak Point ◽  
Angle Measurements ◽  
Plasma Treatments ◽  
Contact Angle Measurements ◽  
Effect Of Oxygen

AbstractThe effect of oxygen plasma treatment on adhesion and surface properties of polypropylene (PP) was assessed. An oxygen rich modified PP layer, immiscible with bulk PP, was formed by the treatment. Contact angle measurements showed that macromolecular motions led with time to rearrangements of the surface layer drastically decreasing its wettability, while its composition, measured by XPS, remained unaffected.The shear strength of PP-epoxy joints increased after plasma treatment. The locus of failure was found to occur at the PP/epoxy interface for untreated PP, within PP in the case of oxygen-plasma-treated samples, close to the modified PP/bulk PP interface. This result suggests that the plasma treament improves the interaction at the PP/epoxy interface, but weakens the mechanical strength of the surface layer thereby creating a weak point at the modified PP/bulk PP interface.

Plasma Modification of DLC Films and the Resulting Surface Biocompatibility

2014 ◽  
Vol 783-786 ◽  
pp. 1396-1401 ◽  
Author(s):  
Mei Wang ◽  
Ying Zhao ◽  
Rui Zhen Xu ◽  
Ming Zhang ◽  
Ricky K.Y. Fu ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Plasma Modification ◽  
Cell Viability Assay ◽  
Water Contact ◽  
Viability Assay ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Generate Surface ◽  
A Cell ◽  
P Type

Diamond-like carbon (DLC) films were synthesized on a p-type silicon wafer using radio-frequency plasma composed of a mixture of Ar and C2H2(ratio of 7 to 28). NH3plasma treatment of as-grown DLC substrate was carried out to generate surface-terminal amino groups while oxidation of as-grown DLC was performed in O2plasma. X-ray photoelectron spectroscopy (XPS) was used to characterize the different surface functions formed on DLC surfaces. Water contact angle measurements indicate different wetbility of modified surfaces. The cell (Mouse MC3T3-E1pre-osteoblasts) morphology and proliferation were monitored to evaluate the biocompatibility of the modified DLC surfaces. A cell count kit-8 (CCK-8 Beyotime) was employed to determine quantitatively the viable pre-osteoblasts. The cell viability assay shows that osteoblast proliferation are improved on NH3and O2plasma-treated DLC surface after culturing for 1day, 2days and 3 days. The cell-surface interactions are studied by fluorescence microscopy. There are more osteoblasts as well as better spreading on the aminated and oxidized surfaces after culturing for 3 days. In summary, compared to the as-grown sample, the modified DLC shows better biocompatibility.

A novel method for contact angle measurements on natural fibers

2016 ◽  
Vol 164 ◽  
pp. 599-604 ◽  
Author(s):  
Sara L. Schellbach ◽  
Sergio N. Monteiro ◽  
Jaroslaw W. Drelich
Keyword(s):  
Contact Angle ◽  
Natural Fibers ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Novel Method

scholarly journals Surface Characterisation of PEEK and Dentin, Treated with Atmospheric Non-Thermal PDD Plasma, Applicable for Dental Chair-Side Procedures

Plasma ◽  
2021 ◽  
Vol 4 (3) ◽  
pp. 389-398
Author(s):  
Marius Behnecke ◽  
Vincent Steinert ◽  
Svea Petersen
Keyword(s):  
Contact Angle ◽  
Phosphoric Acid ◽  
Plasma Treatment ◽  
Water Contact Angle ◽  
Acid Etching ◽  
Water Contact ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Dentin Tubules ◽  
Phosphoric Acid Etching

This study investigates the suitability of Piezoelectric Direct Discharge Plasma as a tool for wetting behaviour modification of PEEK and dentin, and compares the results of this method with low-pressure plasma treatment and phosphoric acid etching. Static contact angle measurements were made, roughness was assessed using tactile measurement, and AFM and SEM images were taken. An optimum operating distance of ≤15 mm was determined for the plasma based on the water contact angle. Furthermore, it was demonstrated that despite only a fraction of the power, the PDD plasma also produces hydrophilic and nanostructured PEEK surfaces with a 38° water contact angle in the same plasma time. In contrast, the gold standard of dental surface modification of dentin—phosphoric acid etching—showed no measurable contact angle due to the exposed dentin tubules. Treatment with PDD plasma reduces the water contact angle of dentin from 65° to 43° and is not negative affected by water. Wet, PDD plasma-treated dentin samples show a water contact angle of only 26.5°. The dentin tubules exposed by chemical etching led to a significantly increased roughness. No comparable effect could be demonstrated for plasma treatment on dentin, but based on the contact angle measurements, a chemically strongly activated surface with strongly polar interaction behaviour can be assumed. The additional use of the PDD plasma technique to improve wetting could therefore have a positive effect on the adhesive bond between human dentin and polymeric dental restorative materials or, depending on the adhesive system, replace the etching process altogether.

Effect of Oxygen Plasma Treatments on Polypropylene-Epoxy Interfacial Strength

1989 ◽  
Vol 154 ◽  
Author(s):  
E. Occhiello ◽  
M. Morra ◽  
G. Morini ◽  
F. Garbassi
Keyword(s):  
Surface Layer ◽  
Plasma Treatment ◽  
Oxygen Plasma ◽  
Interfacial Strength ◽  
Oxygen Plasma Treatment ◽  
Weak Point ◽  
Angle Measurements ◽  
Plasma Treatments ◽  
Contact Angle Measurements ◽  
Effect Of Oxygen

AbstractThe effect of oxygen plasma treatment on adhesion and surface properties of polypropylene (PP) was assessed. An oxygen rich modified PP layer, immiscible with bulk PP, was formed by the treatment. Contact angle measurements showed that macromolecular motions led with time to rearrangements of the surface layer drastically decreasing its wettability, while its composition, measured by XPS, remained unaffected.The shear strength of PP-epoxy joints increased after plasma treatment. The locus of failure was found to occur at the PP/epoxy interface for untreated PP, within PP in the case of oxygen-plasma-treated samples, close to the modified PP/bulk PP interface. This result suggests that the plasma treament improves the interaction at the PP/epoxy interface, but weakens the mechanical strength of the surface layer thereby creating a weak point at the modified PP/bulk PP interface.

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