Plasma Processing of Low Vapor Pressure Liquids to Generate Functional Surfaces

The concept of depositing solid films on low-vapor pressure liquids is introduced and developed into a top-down approach to functionalize surfaces by attaching liquid polyethylene glycol (PEG). Solid-liquid gradients were formed by low-pressure plasma treatment yielding cross-linking and/or deposition of a plasma polymer film subsequently bound to a flexible polydimethylsiloxane (PDMS) backing. The analysis via optical transmission spectroscopy (OTS), optical, confocal laser scanning (CLSM) and scanning electron microscopy (SEM), Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) as well as by water contact angle (WCA) measurements revealed correlations between optical appearance, chemical composition and surface properties of the resulting water absorbing, covalently bound PEG-functionalized surfaces. Requirements for plasma polymer film deposition on low-vapor pressure liquids and effective surface functionalization are defined. Namely, the thickness of the liquid PEG substrate was a crucial parameter for successful film growth and covalent attachment of PEG. The presented method is a practicable approach for the production of functional surfaces featuring long-lasting strong hydrophilic properties, making them predestined for non-fouling or low-friction applications.

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Characterisation of PMMA/ATH Layers Realised by Means of Atmospheric Pressure Plasma Powder Deposition

Advances in Condensed Matter Physics ◽

10.1155/2015/980482 ◽

2015 ◽

Vol 2015 ◽

pp. 1-12 ◽

Cited By ~ 5

Author(s):

Lena M. Wallenhorst ◽

Sebastian Dahle ◽

Matej Vovk ◽

Lisa Wurlitzer ◽

Leander Loewenthal ◽

...

Keyword(s):

Photoelectron Spectroscopy ◽

Atmospheric Pressure ◽

Laser Scanning ◽

Plasma Deposition ◽

Deposition Process ◽

Laser Scanning Microscopy ◽

Raw Material ◽

Confocal Laser ◽

Coating Film ◽

Water Contact

We report on the characteristics of aluminium trihydrate filled poly(methyl methacrylate) composite (PMMA/ATH) coatings realised by plasma deposition at atmospheric pressure. For this purpose, PMMA/ATH powder was fed to a plasma jet where the process and carrier gas was compressed air. The deposited coatings were investigated by X-ray photoelectron spectroscopy and water contact angle measurements. Further, the raw material was characterised before deposition. It was found that, with respect to the raw material, aluminium was uncovered in the course of the plasma deposition process which can be explained by plasma-induced etching of the PMMA matrix. As a result, the wettability of plasma-deposited PMMA/ATH was significantly increased. Even though a uniform coating film could not be realised as ascertained by confocal laser scanning microscopy, the deposited coatings feature notably enhanced characteristics which could be advantageous for further processing.

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Investigation of Spin Coating Cerium-Doped Hydroxyapatite Thin Films with Antifungal Properties

Coatings ◽

10.3390/coatings11040464 ◽

2021 ◽

Vol 11 (4) ◽

pp. 464

Author(s):

Simona Liliana Iconaru ◽

Mihai Valentin Predoi ◽

Patrick Chapon ◽

Sofia Gaiaschi ◽

Krzysztof Rokosz ◽

...

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Photoelectron Spectroscopy ◽

Spin Coating ◽

Laser Scanning ◽

Laser Scanning Microscopy ◽

Confocal Laser ◽

X Ray ◽

Antifungal Properties ◽

Scanning Electron

In this study, the cerium-doped hydroxyapatite (Ca10−xCex(PO4)6(OH)2 with xCe = 0.1, 10Ce-HAp) coatings obtained by the spin coating method were presented for the first time. The stability of the 10Ce-HAp suspension particles used in the preparation of coatings was evaluated by ultrasonic studies, transmission electron microscopy (TEM), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The surface morphology of the 10Ce-HAp coating was studied by SEM and atomic force microscopy (AFM) techniques. The obtained 10Ce-HAp coatings were uniform and without cracks or unevenness. Glow discharge optical emission spectroscopy (GDOES) and X-ray photoelectron spectroscopy (XPS) were used for the investigation of fine chemical depth profiling. The antifungal properties of the HAp and 10Ce-HAp suspensions and coatings were assessed using Candida albicans ATCC 10231 (C. albicans) fungal strain. The quantitative antifungal assays demonstrated that both 10Ce-HAp suspensions and coatings exhibited strong antifungal properties and that they successfully inhibited the development and adherence of C. albicans fungal cells for all the tested time intervals. The scanning electron microscopy (SEM) and confocal laser scanning microscopy (CLSM) visualization of the C. albicans fungal cells adherence to the 10Ce-HAp surface also demonstrated their strong inhibitory effects. In addition, the qualitative assays also suggested that the 10Ce-HAp coatings successfully stopped the biofilm formation.

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Microcontact Printed Protein Micropatterns on Titanium Surface Characterized by Confocal Laser Scanning Microscopy

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.487.730 ◽

2012 ◽

Vol 487 ◽

pp. 730-734 ◽

Cited By ~ 2

Author(s):

Chang Jiang Pan ◽

Yu Dong Nie ◽

Yun Xiao Dong

Keyword(s):

Laser Scanning ◽

Photoelectron Spectrum ◽

Titanium Surface ◽

Microcontact Printing ◽

Laser Scanning Microscopy ◽

Confocal Laser ◽

Water Contact ◽

X Ray ◽

Replication Errors ◽

Titanium Surfaces

In this paper, two kinds of stamps (squares (a×a)) separated by spacing b, the values of a and b were varied from 2.5 µm to 50 µm), i.e. positive and negative stamps, were prepared. The stamps inked with the rhodamine-labeled bovine serum albumin (BSA) were then microcontacted with the aldehyde-functionalized titanium surfaces. Water contact angle and X-ray photoelectron spectrum (XPS) indicated that BSA can be covalently immobilized on aldehyde modified titanium surface by microcontact printing. The experimental results of CLSM showed that the patterns with resolution from 2.5 µm to 50 µm were obtained successfully. Both positive stamp and negative stamp were deformed when the value of a was less than or equal to 5 µm, which resulted in replication errors. Furthermore, the larger spacing (50 µm) resulted in stamp collapse when the value a of the positive stamp was less than or equal to 10 µm, leading to whole fluorescence on substrates.

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Bio-Inspired In Situ Fabrication of 11-Mercaptoundecanoic Acid Coating on Stainless Steel 304 for Corrosion Protection

Materials Science Forum ◽

10.4028/www.scientific.net/msf.913.375 ◽

2018 ◽

Vol 913 ◽

pp. 375-383

Author(s):

Shuo Tian Sun ◽

Yan Hua Lei ◽

Tao Liu ◽

Run Hua Fan ◽

Shi Bin Sun

Keyword(s):

Corrosion Protection ◽

Photoelectron Spectroscopy ◽

Contact Angle Measurement ◽

Angle Measurement ◽

Film Structure ◽

Covalent Attachment ◽

Water Contact ◽

In Situ Fabrication ◽

Corrosion Resistance Property

Bio-inspired in situ fabrication of 11-Mercaptoundecanoic Acid was proposed to prepare self-assembled coating of alkanethiolates on SS304 alloy. In this method, the SS304 was coated with a reactive biopolymer – Polydopamine (PDA) by dispersing them in a dopamine solution and mildly stirring at room temperature with subsequent covalent attachment of 11-Mercaptoundecanoic Acid molecules through the interaction between thiol groups and Polydopamine. The formation and surface structure of the coating were characterized by water contact angle measurement, scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). The electronic properties of such obtained functional film were studied by potentiodynamic polarization curve and EIS in 3.5% NaCl solution. Corrosion protection efficiency near 99 % was evaluated, and the excellent corrosion resistance property could be ascribed to the compact film structure and good seawater stability for modified SS304 surface, especially in limiting the infiltration of Cl-.

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Antimicrobial Activity Evaluation on Silver Doped Hydroxyapatite/Polydimethylsiloxane Composite Layer

BioMed Research International ◽

10.1155/2015/926513 ◽

2015 ◽

Vol 2015 ◽

pp. 1-13 ◽

Cited By ~ 24

Author(s):

C. S. Ciobanu ◽

A. Groza ◽

S. L. Iconaru ◽

C. L. Popa ◽

P. Chapon ◽

...

Keyword(s):

Antimicrobial Activity ◽

Candida Albicans ◽

Photoelectron Spectroscopy ◽

Laser Scanning ◽

Composite Layer ◽

Physicochemical Characterization ◽

Antimicrobial Effect ◽

Laser Scanning Microscopy ◽

Confocal Laser ◽

Composite Layers

The goal of this study was the preparation, physicochemical characterization, and microbiological evaluation of novel hydroxyapatite doped with silver/polydimethylsiloxane (Ag:HAp-PDMS) composite layers. In the first stage, the deposition of polydimethylsiloxane (PDMS) polymer layer on commercially pure Si disks has been produced in atmospheric pressure corona discharges. Finally, the new silver doped hydroxyapatite/polydimethylsiloxane composite layer has been obtained by the thermal evaporation technique. The Ag:HAp-PDMS composite layers were characterized by various techniques, such as Scanning Electron Microscopy (SEM), Glow Discharge Optical Emission Spectroscopy (GDOES), and X-ray photoelectron spectroscopy (XPS). The antimicrobial activity of the Ag:HAp-PDMS composite layer was assessed againstCandida albicansATCC 10231 (ATCC—American Type Culture Collection) by culture based and confirmed by SEM and Confocal Laser Scanning Microscopy (CLSM) methods. This is the first study reporting the antimicrobial effect of the Ag:HAp-PDMS composite layer, which proved to be active againstCandida albicansbiofilm embedded cells.

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Spectral characterisation of new organic fluorescent dyes with an alkoxysilane moiety and their utilisation for the labelling of layered silicates

Chemical Papers ◽

10.2478/s11696-012-0249-9 ◽

2013 ◽

Vol 67 (1) ◽

Cited By ~ 10

Author(s):

Martin Danko ◽

Matej Mičušík ◽

Mária Omastová ◽

Juraj Bujdák ◽

Dušan Chorvát

Keyword(s):

Dicarboxylic Acid ◽

Photoelectron Spectroscopy ◽

Laser Scanning ◽

Fluorescent Dyes ◽

Stokes Shift ◽

Particle Surface ◽

Acid Anhydride ◽

Laser Scanning Microscopy ◽

Layered Silicates ◽

Confocal Laser

AbstractNew fluorescence dyes with an alkoxysilane moiety were synthesised by the condensation of 3-(triethoxysilyl)-1-propanamine (3-aminopropyltriethoxysilane) with 4,10-benzothioxanthene-3,1′-dicarboxylic acid anhydride (BTXA) and N,N-dimethylaminonaphthalene-1,8-dicarboxylic acid anhydride (DMANA), which was accompanied by the formation of an imidic bridge. The compounds N-(3-(triethoxysilyl)propyl)-thioxantheno[2,1,9-dej]isoquinoline-1,3-dione (BTX-S) and 4-(N′, N′-dimethyl)-N-(triethoxysilyl)propyl-1,8-naphthalene dicarboxylic acid imide (DMAN-S) were characterised by steady-state and time-resolved fluorescence spectroscopy in chloroform and ethanol. Both conjugates (BTX-S and DMAN-S) exhibited absorption and emission bands in the same region as the un-substituted BTXA and DMANA. An important Stokes shift was observed for DMAN-S in ethanol. A high fluorescence quantum yield was observed for BTX-S in both solvents and for DMAN-S in chloroform. In addition, the newly developed fluorescent silane dyes were covalently attached to the microscopic particles of layered silicates and on the surface of SiO2 wafers as a proof of concept for fluorescence particle (surface) visualisation. The surface wafer modification was precisely characterised by X-ray photoelectron spectroscopy (XPS). Successful covalent linkage onto the particles of layered silicates was proved by confocal laser scanning microscopy technique.

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Effect of Cu addition to low-alloy structural steel on the resistance against corrosion by the Pseudomonas aeruginosa biofilm

Anti-Corrosion Methods and Materials ◽

10.1108/acmm-04-2021-2472 ◽

2021 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Zhong Li ◽

Qing Lei ◽

Luyao Huang ◽

Chao Liu

Keyword(s):

Pseudomonas Aeruginosa ◽

Photoelectron Spectroscopy ◽

Laser Scanning ◽

Confocal Laser Scanning Microscope ◽

Electrochemical Analysis ◽

Microbiologically Influenced Corrosion ◽

Morphological Observation ◽

Confocal Laser ◽

Content Type ◽

Antibacterial Performance

Purpose Low-alloy structural steels (LASS) face severe microbiologically influenced corrosion (MIC) in their service environments. To mitigate this issue, Cu is often used as an alloying element owing to its intrinsic antimicrobial activity. However, the antibacterial performance and biofilm resistance of Cu-containing LASS (Cu-LASS) are still unclear. This study aims to analyze the effect of Cu addition to 420 MP LASS on its MIC by the Pseudomonas aeruginosa biofilm. Design/methodology/approach Scanning electron microscope, confocal laser scanning microscope and X-ray photoelectron spectroscopy were used to analyze the surface morphology and composition of corrosion products. The antibacterial activities of Cu-LASS were analyzed by the spread-plate method. In addition, electrochemical analysis was conducted to characterize the corrosion behavior of the produced alloy. Findings Bacterial analysis and morphological observation confirmed a reduced sessile cell count and inactivation of the P. aeruginosa biofilm on the surface of Cu-LASS coupons. Electrochemical measurements showed that Cu-LASS exhibited large polarization and charge-transfer resistances, which indicated excellent MIC resistance. This significantly enhanced resistance to MIC could be explained by the synergistic effect of released Cu2+ from the Cu-LASS surface and immediate contact to Cu-rich phase in the surface and the release of Cu2+ ions from the Cu-LASS surface. Originality/value The effect of Cu addition on the MIC resistance and antibacterial performance of LASS is seldom reported. It is necessary to investigate the corrosion resistance of Cu-LASS and clarify its antibacterial mechanism. This paper fulfills this need.

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Electrochemical and surface analytical techniques applied to microbiologically influenced corrosion investigation

Corrosion Reviews ◽

10.1515/corrrev-2017-0032 ◽

2018 ◽

Vol 36 (4) ◽

pp. 349-363 ◽

Cited By ~ 4

Author(s):

László Trif ◽

Abdul Shaban ◽

Judit Telegdi

Keyword(s):

Photoelectron Spectroscopy ◽

Laser Scanning ◽

Electrochemical Impedance ◽

Electrochemical Techniques ◽

Analytical Techniques ◽

Laser Scanning Microscopy ◽

Microbiologically Influenced Corrosion ◽

Microbial Consortia ◽

Confocal Laser ◽

The Impact

AbstractSuitable application of techniques for detection and monitoring of microbiologically influenced corrosion (MIC) is crucial for understanding the mechanisms of the interactions and for selecting inhibition and control approaches. This paper presents a review of the application of electrochemical and surface analytical techniques in studying the MIC process of metals and their alloys. Conventional electrochemical techniques, such as corrosion potential (Ecorr), redox potential, dual-cell technique, polarization curves, electrochemical impedance spectroscopy (EIS), electrochemical noise (EN) analysis, and microelectrode techniques, are discussed, with examples of their use in various MIC studies. Electrochemical quartz crystal microbalance, which is newly used in MIC study, is also discussed. Microscopic techniques [scanning electron microscopy (SEM), environmental SEM (ESEM), atomic force microscopy (AFM), confocal laser microscopy (CLM), confocal laser scanning microscopy (CLSM), confocal Raman microscopy] and spectroscopic analytical methods [Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS)] are also highlighted. This review highlights the heterogeneous characteristics of microbial consortia and use of special techniques to study their probable effects on the metal substrata. The aim of this review is to motivate using a combination of new procedures for research and practical measurement and calculation of the impact of MIC and biofilms on metals and their alloys.

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Preparation and properties of bamboo/polymer composites enhanced by in situ polymerization of furfuryl alcohol

Materials Express ◽

10.1166/mex.2019.1550 ◽

2019 ◽

Vol 9 (7) ◽

pp. 712-722 ◽

Cited By ~ 3

Author(s):

Yong Wang ◽

Layun Deng ◽

Zhihong Xiao ◽

Xianjun Li ◽

Youhua Fan ◽

...

Keyword(s):

Photoelectron Spectroscopy ◽

Furfuryl Alcohol ◽

Laser Scanning ◽

In Situ Polymerization ◽

Decay Resistance ◽

Laser Scanning Microscopy ◽

Modulus Of Rupture ◽

Confocal Laser ◽

Infrared Spectrometry ◽

Addition Level

The objective of this paper aimed to develop a novel method to prepare enhanced bamboo-based materials. Furfuryl alcohol (FA) was used as the modification agent with maleic anhydride (MA) as the catalyst. Different bamboo samples were prepared with different FA addition level (10 wt%, 20 wt% and 30 wt%). The furfurylated bamboo samples were characterized by confocal laser scanning microscopy (CLSM), Fourier transform infrared spectrometry (FTIR), X-ray photoelectron spectroscopy (XPS), and thermogravimetric analysis (TGA). Moreover, the physical and mechanical properties including weight percent gain (WPG), water uptake (WU), thickness swelling (TS), modulus of rupture (MOR), and modulus of elastic (MOE) were investigated in detail. Additionally, the decay resistance of pristine and furfurylated bamboo samples was also investigated. The results showed that FA resins were incorporated into bamboo and polymerized within cell walls. The WPG, WU, and TS were dependent on FA addition level. When the FA addition level reached 30 wt%, the physical properties were all improved significantly. However, due to acidic MA as the catalyst, MOR of furfurylated bamboo samples was enhanced only 2.5% while MOE was weakened. The thermal stability and decay resistance of furfurylated bamboo were all enhanced significantly compared to pristine bamboo. Especially, furfurylated bamboo treated with 30 wt% FA achieved Class I Strong Decay Resistance (<10%) with 5.3% of mass loss.

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