Contamination-free non-contact wettability assessment system

Tanaka, Nobuyuki; Haruzono, Yoshihide; Nasu, Hiromitsu; Nakanishi, Yuki; Takahara, Junko; Awazu, Akane; Tanaka, Yo

doi:10.1186/s40648-017-0089-z

Cited by 4 publications

(3 citation statements)

References 21 publications

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“…The main characteristic of contamination formation lies on the physico-chemical type of link created between contamination and machine parts that enable the adherence on them after a complex wetting process. 11,15 They put together interfacial superficial strength of both elements to form cohesive continuity. 16 The physical adsorption that enable adhesion when the dirt wet and dry on the machine part, can be establish by the Van Der Waal intermolecular 16,17 and other forces (dispersion forces, induction forces, hydrogenous links, dipoles -dipoles links) acting on lower distance close to 0.5 nm.…”

Section: Mechanism Of Formation Of Contaminationsmentioning

confidence: 99%

Low frequency vibratory cleaning of paint and rust contaminants from machines parts

Essola

Njomoue

Offole

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part B:

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This work investigates the effect of low frequency vibratory processing for cleaning and washing various machine components parts from rusts and old paints deposits. The experimental investigation was carried out with special prepared samples that were weighted and exposed to paints and rust contaminants. These samples were treated in universal horizontal vibration machine UVHM 4 × 10 with different combination of instrumental processing medium, process fluid, machine amplitude and frequency of oscillations. They were periodically reweighted after processing and compared to etalon with control of quantity of dust that have been removed, sample cleanliness and also other functional parameters. Statistical analysis has been used to characterize ongoing process and full factorial analysis to establish experimental parameters dependency. The result is showing the complex dependence of samples cleanliness to each processing parameters like processing time, amplitude of oscillations, frequency of oscillations, process fluid parameters, instrumental medium, etc. Between this parameters although the most important successively the amplitude of oscillations, the frequency of oscillations the processing medium and the processing fluid depending to his considered composition, the optimal processing time can be reach only by complex combination of all this parameters every of them carry an amplify coefficient. Low frequency oscillations can be used to monitor and optimize washing and cleaning operations of paints and rusts contaminations. That guarantees process automation, its effectiveness for a large industrial application.

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Section: Mechanism Of Formation Of Contaminationsmentioning

confidence: 99%

Low frequency vibratory cleaning of paint and rust contaminants from machines parts

Essola

Njomoue

Offole

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…Thus, easy complementary methods are desired to investigate the hydration process as well as the surface properties in water. Tanaka et al recently established the air-injection-mediated liquid exclusion (AILE) method as a new wettability assessment system. − In this system, an air jet was blown on a surface immersed in liquid media, and the liquid exclusion diameter was measured. A larger liquid exclusion diameter was observed at a more water-repelling surface (Figure ).…”

Section: Introductionmentioning

confidence: 99%

“…A larger liquid exclusion diameter was observed at a more water-repelling surface (Figure ). The previous research has reported that the size of the liquid exclusion diameter correlated to the contact angle . Also, the wettability of the cell culture surface and biofilm made from microorganisms was examined by the AILE method to evaluate the biological conditions. , Thus, this method is suitable for the assessment of the change in time-dependent wettability of soft interfaces.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the Hydration Process of Phospholipid-Mimetic Polymers Using Air-Injection-Mediated Liquid Exclusion Methods

et al. 2020

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2-Methacryloyloxyethyl phosphorylcholine (MPC) polymers including hydrophobic units such as poly(MPC-co-butyl methacrylate) (PMB) and poly(MPC-co-dodecyl methacrylate) (PMD) are used as coating agents for medical devices because of their antifouling effects. In this study, the whole hydration process of MPC polymer-coated surfaces was investigated using air-injectionmediated liquid exclusion (AILE) methods in which the liquid exclusion diameter during air injection was correlated to the waterrepelling property. The prejetted and standard AILE methods showed the initial change from a dry to a wet state and the swelling behaviors of the MPC polymers, respectively. The liquid exclusion diameter of the MPC polymer-coated surfaces increased with an increase in the immersion time in various aqueous solutions such as deionized water, phosphate-buffered saline (PBS), and cell culture media. Moreover, the liquid exclusion diameter of the PMD-coated surface was larger than that of the PMB-coated one. Ellipsometry directly indicated the polymer layers swollen in water. Scanning probe microscopy (SPM) revealed that nanosized protuberances were formed in water, especially at the PMD-coated surface. The different swelling behaviors of these MPC polymercoated surfaces affected the liquid exclusion diameters. Thus, the AILE methods are a powerful tool to elucidate the hydration process in various liquid media.

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In-situ detection based on the biofilm hydrophilicity for environmental biofilm formation

Tanaka

Kogo

Hirai

et al. 2019

Sci Rep

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A biofilm has a unique structure composed of microorganisms, extracellular polymeric substances (EPSs), etc., and it is layered on a substrate in water. In material science, it is important to detect the biofilm formed on a surface to prevent biofouling. EPSs, the major component of the biofilm, mainly consist of polysaccharides, proteins, nucleic acids, and lipids. Because these biomolecules have a variety of hydrophilicities or hydrophobicities, the substrate covered with the biofilm shows different wettability from the initial state. To detect the biofilm formation, this study employed a liquid-squeezing-based wettability assessment method with a simple wettability index: the liquid-squeezed diameter of a smaller value indicates higher wettability. The method is based on the liquid-squeezing behaviour of a liquid that covers sample surfaces when an air-jet is applied. To form the biofilm, polystyrene surfaces were immersed and incubated in a water-circulated bioreactor that had collected microorganisms in ambient air. After the 14-d incubation, good formation of the biofilm on the surfaces was confirmed by staining with crystal violet. Although the contact angles of captive bubbles on the surfaces with the biofilm were unmeasurable, the liquid-squeezing method could distinguish between hydrophilic and hydrophobic initial surfaces with and without biofilm formation using the diameter of the liquid-squeezed area. The surface wettability is expected to be a promising property for in-situ detection of biofilm formation on a macroscopic scale.

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Contamination-free non-contact wettability assessment system

Cited by 4 publications

References 21 publications

Low frequency vibratory cleaning of paint and rust contaminants from machines parts

Low frequency vibratory cleaning of paint and rust contaminants from machines parts

Characterization of the Hydration Process of Phospholipid-Mimetic Polymers Using Air-Injection-Mediated Liquid Exclusion Methods

In-situ detection based on the biofilm hydrophilicity for environmental biofilm formation

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