Analysis of interaction between mechanical force and chemical effect in cleaning phenomenon by probability density functional method

Oya-Hasegawa, Miyako; Sato, Yuya; Oya, Masaru

doi:10.1002/jsde.12565

Cited by 6 publications

(4 citation statements)

References 37 publications

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“…In the past data, 0.25 was obtained as σ rl when the same artificially soiled fabric was washed with a tergotometer while changing the pH with 0.4％ SDS aqueous solution 20) . When the same soiled fabric was washed with commercial detergents, σ rl was 0.32 23) .…”

Section: Analysis Of Tergotometer Cleaning Resultsmentioning

confidence: 99%

“…The probability density functional method was used, which was developed on the premise that both the soil adhesion and dirt removal force follow a normal distribution 21−23) . By entering the 5 min, 10 min, 15 min, and 20 min detergency into the original application, the two parameters σ rl associated with the cleaning mechanism 24,25) and μ rl associated with the level of cleaning power [18][19][20]26) can be calculated.…”

Section: Parameter Calculation By Probability Density Function Methodsmentioning

confidence: 99%

“…The detergency was obtained based on the surface reflectance of the soiled fabric. The soiled fabric's surface reflectance (Y-value) before and after washing was measured with a colorimeter (SE-2000, Nippon Denshoku Industries Co., Japan) , and the K/S value was obtained using the Kubelka-Munk formula 20) . Then, the detergency was calculated by considering the K/S value as proportional to the amount of dirt.…”

Section: Calculation Of Detergencymentioning

confidence: 99%

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A Small-scale Washing Test That Reproduces the Mechanical Forces Occurring Inside a Commercial Washing Machine

Oya-Hasegawa

Oya

2023

J. Oleo Sci.

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there are reports of testing the detergency performance of developed surfactants and microemulsions with a tergotometer 12−14) and examining the redeposition prevention effect of new polymers using a tergotometer 15) . There is also a proposal 16) for a test method using a tergotometer to estimate the amount of microfibers released from fabrics. Other studies have investigated the removal pesticides adhered to gloves using a launderometer 17) but a tergotometer is commonly used in studies focused on washing machines.A tergotometer has been used to study the interaction between temperature, pH, surfactant concentration, and agitation on laundry detergency as well 18−20) . However, when screening new synthetic substances or conducting detailed detergency tests on the compounding ratio and concentration effects of ingredients, a tergotometer is larger than desired. Therefore, a cleaning system that is smaller and can provide the same mechanical force is required.Therefore, in this study, a tube rotator, universal shaker, high-speed shaker, and magnetic stirrer were used to construct a system that can estimate the cleaning performance Abstract: A small-scale washing test model was proposed to reproduce the mechanical forces occurring inside a household washing machine in Japan. Washing tests were conducted using household washing machines, a tergotometer, and four types of small-scale washing test models using JIS-designated artificially soiled fabric. As a result of conducting washing tests in 10 households during winter and summer, we determined that the mechanical force of the washing machine was equivalent to 90-100 rpm agitation by a tergotometer. Similar detergency was obtained by rotating a 50 mL centrifuge tube with a tube rotator. Then, a centrifuge tube containing 35 mL of detergent solution, ten 1/4-inch stainless steel balls, and three 20 × 20 mm soiled fabrics was rotated at 50 rpm. Probability density functional theory analysis did not identify any kinetic problems, which means that the properties of the applied mechanical forces are similar to those occurring in the tergotometer and tube rotator test.

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Section: Analysis Of Tergotometer Cleaning Resultsmentioning

confidence: 99%

Section: Parameter Calculation By Probability Density Function Methodsmentioning

confidence: 99%

Section: Calculation Of Detergencymentioning

confidence: 99%

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A Small-scale Washing Test That Reproduces the Mechanical Forces Occurring Inside a Commercial Washing Machine

Oya-Hasegawa

Oya

2023

J. Oleo Sci.

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“…Traditional cleaning approaches, based on chemical cleaning or mechanical cleaning, have been widely used to remove surface contaminants from metals, such as paint, rust, oil, and grease [ 3 ]. However, in some cases, organic solvents involved in chemical cleaning are undesirable.…”

Section: Introductionmentioning

confidence: 99%

Degradation of Stains from Metal Surfaces Using a DBD Plasma Microreactor

Wang,

Miao,

et al. 2024

Micromachines

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The surface cleaning of metals plays a pivotal role in ensuring their overall performance and functionality. Dielectric barrier discharge (DBD) plasma, due to its unique properties, has been considered to be a good alternative to traditional cleaning methods. The confinement of DBD plasma in microreactors brings additional benefits, including excellent stability at high pressures, enhanced density of reactive species, reduced safety risks, and less gas and energy consumption. In the present work, we demonstrated a DBD plasma-based method for the degradation of stains from metal surfaces in a microreactor. Aluminum plates with capsanthin stains were used to investigate the influence of operational parameters on the decolorization efficiency, including plasma discharge power, plasma processing time, and O2 content in the atmosphere. The results revealed that an increase in plasma discharge power and plasma processing time together with an appropriate amount of O2 in the atmosphere promote the degradation of capsanthin stains. The optimum processing condition was determined to be the following: plasma power of 11.3 W, processing time of 3 min, and Ar/O2 flow rate of 48/2 sccm. The evolution of composition, morphology, bonding configuration, and wettability of aluminum plates with capsanthin and lycopene stains before and after plasma treatment were systematically investigated, indicating DBD plasma can efficiently degrade stains from the surface of metals without damage. On this basis, the DBD plasma cleaning approach was extended to degrade rhodamine B and malachite green stains from different metals, suggesting it has good versatility. Our work provides a simple, efficient, and solvent-free approach for the surface cleaning of metals.

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Ultrasonic Cleaning for Irrigating Purulent Substances during Laparoscopic Gastrointestinal Surgery

et al. 2023

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Chiba Rosai Hospital has one of the leading treatment records in Japan for cholecystitis (17 th ) , colectomy (37 th ) , and peritonitis/intra-abdominal abscess (73 rd ) in the 2019 National Clinical Database (NCD) . Moreover, more than 90％ of the operations are performed using a laparoscope. Indeed, in the gastrointestinal surgery department, which has many experienced surgeons, it is desirable to improve irrigation techniques during laparoscopic surgery. However, the application of new methods may increase patient risks in the field of clinical medicine, and there are issues such as ethical regulations and infection risks regarding the collection of purulent substances to be removed. Therefore, as a preliminary step in conducting clinical trials, it is desirable to consider model tests to improve dirt removal ability and estimate safety.The most advanced modeling techniques in the cleaning field are probably related to the development of detergents. Model studies have established cleaning theories Abstract: To improve the outcome of laparoscopic gastrointestinal surgery, improvement in the technology for removing purulent substances from the abdominal cavity is required. Ultrasonic cleaning technology may be suitable for the task. However, it is necessary to examine cleaning efficiency and safety through model tests that can lead to clinical trials for practical use. Nine surgical specialists first estimated the distribution of the actual attachment of purulent substances using videos of removing pus-like model dirt as an evaluation scale. Subsequently, cleaning tests were conducted using a small-size shower with model dirt that was somewhat difficult to remove, and its suitability as a model sample was confirmed. A mixture of miso and other substances was attached to a silicon sheet to prepare a test sample. The model dirt could be removed within a few seconds by cleaning using a probe-type ultrasonic homogenizer while the test sample was submerged in water. This performance greatly surpassed that of water flow cleaning under increased water pressure. An ultrasonic cleaner that is useful for irrigation during laparoscopic surgery will be suitable for practical use in laparoscopic surgery.

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Analysis of interaction between mechanical force and chemical effect in cleaning phenomenon by probability density functional method

Cited by 6 publications

References 37 publications

A Small-scale Washing Test That Reproduces the Mechanical Forces Occurring Inside a Commercial Washing Machine

A Small-scale Washing Test That Reproduces the Mechanical Forces Occurring Inside a Commercial Washing Machine

Degradation of Stains from Metal Surfaces Using a DBD Plasma Microreactor

Ultrasonic Cleaning for Irrigating Purulent Substances during Laparoscopic Gastrointestinal Surgery

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