著者
Kana Kikegawa Kyuuichirou Takamatsu Masaru Kawakami Hidemitsu Furukawa Hiroyuki Mayama Yoshimune Nonomura
出版者
公益社団法人 日本油化学会
雑誌
Journal of Oleo Science (ISSN:13458957)
巻号頁・発行日
vol.66, no.4, pp.383-389, 2017 (Released:2017-04-03)
参考文献数
32

Hierarchical structures, also known as fractal structures, exhibit advantageous material properties, such as water- and oil-repellency as well as other useful optical characteristics, owing to its self-similarity. Various methods have been developed for producing hierarchical geometrical structures. Recently, fractal structures have been manufactured using a 3D printing technique that involves computer-aided design data. In this study, we confirmed the accuracy of geometrical structures when Koch curve-like fractal structures with zero to three generations were printed using a 3D printer. The fractal dimension was analyzed using a box-counting method. This analysis indicated that the fractal dimension of the third generation hierarchical structure was approximately the same as that of the ideal Koch curve. These findings demonstrate that the design and production of fractal structures can be controlled using a 3D printer. Although the interior angle deviated from the ideal value, the side length could be precisely controlled.
著者
Yuuki Aita Yoshimune Nonomura
出版者
Japan Oil Chemists' Society
雑誌
Journal of Oleo Science (ISSN:13458957)
巻号頁・発行日
pp.ess15250, (Released:2016-05-16)
被引用文献数
1 2

The surface properties and the tactile texture of human hair are important in designing hair-care products. In this study, we evaluated the temporal changes of friction and temperature during the drying process of wet human hair containing water, silicone oil, or oil-in-water (O/W) emulsion. The wet human hair including water or O/W emulsion have a moist feel, which was caused by the temperature reduction of approximately 3-4°C. When human hair is treated with silicone oil, more than 60% of the subjects felt their hair to be slippery and smooth like untreated hair. Treating hair with O/W emulsion after drying made the subject perceive a slippery feeling because the surfactant reduced friction on the hair surface. These results indicated that both friction and thermal properties of the hair surface are important to control the tactile texture of the human hair.
著者
Yoshimune Nonomura Takehito Baba Takaaki Miyashita Takashi Maeno
出版者
(社)日本化学会
雑誌
Chemistry Letters (ISSN:03667022)
巻号頁・発行日
vol.40, no.12, pp.1426-1427, 2011-12-05 (Released:2011-12-03)
参考文献数
19
被引用文献数
2

We evaluated the softness of various silicone elastomers installed on a tactile evaluation system. The softness of the elastomers was reflected by the vertical force when subjects pushed the elastomers with their fingers. The moving behavior depended on the elastic properties of the contacted objects; namely, a pushing pattern and a sliding pattern were observed for the soft and hard elastomers, respectively.
著者
Taiki Miyazawa Keigo Matsuda Atsuhiro Fujimori Yoshimune Nonomura
出版者
(社)日本化学会
雑誌
Chemistry Letters (ISSN:03667022)
巻号頁・発行日
vol.40, no.11, pp.1262-1263, 2011-11-05 (Released:2011-10-15)
参考文献数
15
被引用文献数
1

Manganese oxide nanoparticles can be obtained simply by mixing surfactant/water/oil ternary systems containing dialkyldimethylammonium chloride, manganese(II) nitrate hexahydrate, and n-hexane. This finding is valuable in the design of a one-pot synthesis of nanoparticles from microemulsion systems.
著者
Minako Okukawa Takamasa Watanabe Maki Miura Hiroyuki Konno Shigekazu Yano Yoshimune Nonomura
出版者
Japan Oil Chemists' Society
雑誌
Journal of Oleo Science (ISSN:13458957)
巻号頁・発行日
pp.ess19074, (Released:2019-07-10)

1,2-Alkanediol exhibits antibacterial activity against several bacteria and yeast. However, few studies have reported antimicrobial tests on skin microbiome. Bacterial microbiome on the skin surface include Staphylococcus aureus (S. aureus), which causes rough skin and inflammation in atopic dermatitis and Staphylococcus epidermidis (S. epidermidis), which enhances innate immunity. In this study, the minimal inhibitory concentration (MIC) was evaluated for 1,2-alkanediol comprising 4–12 carbon atoms against S. aureus and S. epidermidis. 1,2-Alkanediol comprising 6–12 carbon atoms exhibited antimicrobial activity against both species of Staphylococcus. The antibacterial activity depended on the alkyl chain length. In addition, the minimum bactericidal concentration (MBC) on agar was evaluated for 1,2-alkanediol comprising 6–12 carbon atoms. 1,2-Octanediol and 1,2-decanediol exhibited significant bactericidal activity.
著者
Takamasa Watanabe Yoshiaki Yamamoto Maki Miura Hiroyuki Konno Shigekazu Yano Yoshimune Nonomura
出版者
Japan Oil Chemists' Society
雑誌
Journal of Oleo Science (ISSN:13458957)
巻号頁・発行日
pp.ess18220, (Released:2019-02-13)

Bacterial flora on the skin surface contains Staphylococcus aureus (S. aureus) and Staphylococcus epidermidis (S. epidermidis) which causes rough skin and atopic dermatitis and enhances innate immunity, respectively. In this study, minimum inhibitory concentration (MIC) was evaluated for six saturated fatty acids and two unsaturated fatty acids against S. aureus and S. epidermidis. The antimicrobial behavior in the liquid medium was categorized into three groups. The first was the selective antibacterial activity group comprising myristic acid (C14:0 fatty acid), palmitoleic acid (C16:1 fatty acid), and oleic acid (C18:1 fatty acid) and preferentially displayed antimicrobial activity for S. aureus (group 1). C16:1 fatty acid displayed high antimicrobial activity only for S. aureus. The second was the non-selective antibacterial activity group which displayed antibacterial activity for both Staphylococci (group 2). Caprylic acid (C8:0 fatty acid), capric acid (C10:0 fatty acid), and lauric acid (C12:0 fatty acid) comprised group 2. The third was the non-antibacterial activity group which did not show significant antimicrobial activity (group 3). Bactericidal activities were confirmed for C12:0 fatty acid and C16:1 fatty acid by evaluating the minimum bactericidal concentration (MBC) on the agar medium. C12:0 fatty acid displayed non-selective bactericidal behavior against S. aureus and S. epidermidis when the fatty acid concentration was above 250 μg mL–1. These findings suggest that C16:1 fatty acid has the potential to be used as a detergent in skin care and medical products because it can selectively kill only S. aureus.
著者
Toshiya Morikawa Yoshiaki Yamamoto Yoshimune Nonomura
出版者
Japan Oil Chemists' Society
雑誌
Journal of Oleo Science (ISSN:13458957)
巻号頁・発行日
vol.67, no.7, pp.859-862, 2018 (Released:2018-07-01)
参考文献数
25

Fatty acid calcium salt is a high melting point powder excellent in lubricity and water repellency and is often used as a cosmetic raw material. We have shown that several calcium salts of fatty acids have high selective bactericidal activity against Staphylococcus aureus and Propionibacterium acnes and low bactericidal activity against Staphylococcus epidermidis. In this study, we evaluated the influence of pH on the bactericidal behavior of calcium laurate, and showed that under acidic conditions it shows higher bactericidal activity against both bacteria but selectivity becomes lower. This finding is useful for designing skin cleansers and makeup cosmetics containing lauric acid.
著者
Yoshiaki Yamamoto Yuki Kawamura Yuki Yamazaki Tatsuro Kijima Toshiya Morikawa Yoshimune Nonomura
出版者
公益社団法人 日本油化学会
雑誌
Journal of Oleo Science (ISSN:13458957)
巻号頁・発行日
vol.64, no.3, pp.283-288, 2015 (Released:2015-03-01)
参考文献数
30
被引用文献数
2 9

Palmitoleic acid is a promising bactericidal agent for cleansing products with alternative bactericidal abilities. In this study, we focus on the physical and biological activity of palmitoleic acid calcium salt (C16:1 fatty acid Ca salt) because it forms via an ion-exchange reaction between palmitoleic acid and Ca ions in tap water, and remains on the skin surface during the cleansing process. Here, we prepared C16:1 fatty acid Ca salt to investigate its crystal structure and physical and bactericidal properties. The Ca salt was a plate-shaped lamellar crystalline powder with a particle diameter of several micrometers to several tens of micrometers; it exhibited significant lubricity and alternative bactericidal activity against Staphylococcus aureus (S. aureus) and Propionibacterium acnes (P. acnes). We also examined other fatty acid Ca salts prepared from lauric acid (C12:0 fatty acid), palmitic acid (C16:0 fatty acid), and oleic acid (C18:1 fatty acid). The bactericidal activities and lubricity of the fatty acid Ca salts changed with the alkyl chain length and the degree of unsaturation. The C16:1 fatty acid Ca salt exhibited the strongest selective bactericidal ability among the four investigated fatty acid Ca salts. These findings suggest that C16:1 fatty acid and its Ca salt have potential applications in cleansing and cosmetic products.
著者
Yuuki Aita Yoshimune Nonomura
出版者
公益社団法人 日本油化学会
雑誌
Journal of Oleo Science (ISSN:13458957)
巻号頁・発行日
vol.65, no.6, pp.493-498, 2016 (Released:2016-06-01)
参考文献数
23
被引用文献数
2

The surface properties and the tactile texture of human hair are important in designing hair-care products. In this study, we evaluated the temporal changes of friction and temperature during the drying process of wet human hair containing water, silicone oil, or oil-in-water (O/W) emulsion. The wet human hair including water or O/W emulsion have a moist feel, which was caused by the temperature reduction of approximately 3-4°C. When human hair is treated with silicone oil, more than 60% of the subjects felt their hair to be slippery and smooth like untreated hair. Treating hair with O/W emulsion after drying made the subject perceive a slippery feeling because the surfactant reduced friction on the hair surface. These results indicated that both friction and thermal properties of the hair surface are important to control the tactile texture of the human hair.
著者
Yoshimune Nonomura Azusa Yamaguchi
出版者
(社)日本化学会
雑誌
Chemistry Letters (ISSN:03667022)
巻号頁・発行日
vol.45, no.2, pp.206-208, 2016-02-05 (Released:2016-02-05)
参考文献数
9
被引用文献数
1

The friction behaviors of water and aqueous solutions of thickener were evaluated between a contact probe with a striped rough surface and a substrate. When the probe surface is flat, the contact states are the boundary lubrication and fluid film lubrication states for water and the thickener aqueous solutions, respectively. In contrast, for the contact probe with a striped rough surface, friction occurred under fluid lubrication state for both water and thickener solutions. These results indicate that the liquid in the depression on the striped rough surfaces changes the regime of friction.
著者
Yuki Kawamura Hiroyuki Mayama Yoshimune Nonomura
出版者
公益社団法人 日本油化学会
雑誌
Journal of Oleo Science (ISSN:13458957)
巻号頁・発行日
vol.61, no.9, pp.477-482, 2012 (Released:2012-09-08)
参考文献数
32
被引用文献数
1 2

Liquid marbles are water droplets covered with solid particles. Here we show a method for the preparation of edible liquid marbles and capsules covered with fatty acid crystals and triacylglycerol crystals. We prepared liquid marbles using a simple method; namely, a water droplet was rolled on lipid crystals in petri dishes. The resulting marbles were converted to capsules covered with a lipid shell by heating. These marbles were stable not only on glass surfaces but also on water surfaces because they had rigid hydrophobic exteriors. The lifetime of the liquid marbles on water depended on the alkyl chain length of the lipid molecules and the pH of the water. These findings are useful for applying liquid marbles to food, cosmetic, and medical products.
著者
Taro Oyama Hiroyuki Mayama Yoshimune Nonomura
出版者
(社)日本化学会
雑誌
Chemistry Letters (ISSN:03667022)
巻号頁・発行日
vol.42, no.8, pp.871-872, 2013-08-05 (Released:2013-08-05)
参考文献数
11
被引用文献数
6

We have investigated the spreading process of oil-in-water emulsions containing oleic acid droplets on flat and rough fractal agar gel surfaces. Significant spreading inhibition owing to local condensation of oil droplets is observed on flat agar gel surfaces. On the other hand, such inhibition is not observed on the fractal gel surfaces for any of the emulsions. The rough structure of the gel surfaces is an important factor of spreading dynamics of emulsions on surfaces.
著者
Akira Takahashi Azusa Yamaguchi Yoshimune Nonomura
出版者
(社)日本化学会
雑誌
Chemistry Letters (ISSN:03667022)
巻号頁・発行日
pp.140778, (Released:2014-09-09)
被引用文献数
3

We evaluated the frictional force between two finger models that mimic properties of fingertips. Friction dynamics were drastically changed with the presence of fingerprints and variations in sliding speed and vertical force. For example, a periodic variation of the frictional force was observed under slow sliding conditions between finger models with fingerprint-like rough surfaces.
著者
Keitaro Kuramitsu Toshio Nomura Shyuhei Nomura Takashi Maeno Yoshimune Nonomura
出版者
(社)日本化学会
雑誌
Chemistry Letters (ISSN:03667022)
巻号頁・発行日
vol.42, no.3, pp.284-285, 2013-03-05 (Released:2013-02-23)
参考文献数
13
被引用文献数
12

We developed a friction evaluation system with a human finger model. The surface of the model was covered with imitation fingerprints. When a polypropylene surface was rubbed against the finger model, the friction profile varied with the sliding velocity and vertical force.
著者
Naoki Nakagawa Yoshimune Nonomura
出版者
(社)日本化学会
雑誌
Chemistry Letters (ISSN:03667022)
巻号頁・発行日
vol.40, no.8, pp.818-819, 2011-08-05 (Released:2011-07-02)
参考文献数
28
被引用文献数
4

We observed the drying process of Pickering emulsions with a microscope. In the case of water-in-oil (w/o) emulsions stabilized by common surfactants, the emulsion droplets shrunk while maintaining their spherical shapes. On the other hand, in the case of w/o emulsions stabilized by solid particles, wrinkles occurred and expanded on the droplet surfaces. The colorant dissolved in the water phase remained in a wide area after drying.
著者
Yoshimune Nonomura Masahiro Yamane
出版者
(社)日本化学会
雑誌
Chemistry Letters (ISSN:03667022)
巻号頁・発行日
vol.37, no.4, pp.406-407, 2008-04-05 (Released:2008-03-01)
参考文献数
12
被引用文献数
1

We found self-motion and accelerated dissolution of a fatty acid particle at the oil–water interface. The dissolution time at the interface was 15–20 times shorter than that in the oil phase. The driving force of the self-motion and the accelerated dissolution is the Marangoni flow induced by the spatial heterogeneity of a fatty acid layer at the oil–water interface.
著者
Maki Miura Yoshimune Nonomura
出版者
Japan Oil Chemists' Society
雑誌
Journal of Oleo Science (ISSN:13458957)
巻号頁・発行日
pp.ess19016, (Released:2019-06-10)

Hydrophobicity of ingredients is important for designing food, pharmaceuticals, and cosmetics. Here, we evaluated the hydrophobicity of fatty acids and showed the effect of the alkyl length and the unsaturation degree using reversed-phase thin layer chromatography (RP-TLC). A linear relation was obtained between the methanol concentration in a mobile phase and the Rm value. The linear regression analysis was achieved and the hydrophobicity value Rmw was obtained using the robust regression (MM-estimator). The hydrophobicity of fatty acids depends on the structure of alkyl chain as follows: a longer alkyl chain in fatty acid increased the hydrophobicity. Additionally, the hydrophobicity increased as the number of unsaturated parts increased. Fatty acid with branched structures were less hydrophobic than that with straight chained structures.
著者
Rana Shimizu Yoshimune Nonomura
出版者
Japan Oil Chemists' Society
雑誌
Journal of Oleo Science (ISSN:13458957)
巻号頁・発行日
vol.67, no.1, pp.47-54, 2018 (Released:2018-01-01)
参考文献数
18
被引用文献数
2

We have developed an artificial skin that mimics the morphological and mechanical properties of human skin. The artificial skin comprises a polyurethane block possessing a microscopically rough surface. We evaluated the tactile sensations when skin-care cream was applied to the artificial skin. Many subjects perceived smooth, moist, and soft feels during the application process. Cluster analysis showed that these characteristic tactile feels are similar to those when skin-care cream is applied to real human skin. Contact angle analysis showed that an oil droplet spread smoothly on the artificial skin surface, which occurred because there were many grooves several hundred micrometers in width on the skin surface. In addition, when the skin-care cream was applied, the change in frictional force during the dynamic friction process increased. These wetting and frictional properties are important factors controlling the similarity of artificial skin to real human skin.
著者
Natsumi Asanuma Yuuki Aita Yoshimune Nonomura
出版者
Japan Oil Chemists' Society
雑誌
Journal of Oleo Science (ISSN:13458957)
巻号頁・発行日
pp.ess18038, (Released:2018-08-14)

We evaluated the friction properties of five cosmetic sponges on artificial skin using sinusoidal motion-friction evaluation system. No significant difference was observed in the pleasant score of the five sponges when these sponges were rubbed on the skin surface. The sponges were classified into three groups based on their tactile feel. Their characteristic tactile textures were moist-soft-slippery, moist-dry-rough, and moist feels. The slippery feel was found to depend on the thickness of the sponge’s cell wall, its surface tension, and the change in friction coefficient in the dynamic friction process. These findings are useful in the design of cosmetic sponges.
著者
Rana Shimizu Yoshimune Nonomura
出版者
Japan Oil Chemists' Society
雑誌
Journal of Oleo Science (ISSN:13458957)
巻号頁・発行日
pp.ess17152, (Released:2017-12-14)
被引用文献数
2

We have developed an artificial skin that mimics the morphological and mechanical properties of human skin. The artificial skin comprises a polyurethane block possessing a microscopically rough surface. We evaluated the tactile sensations when skin-care cream was applied to the artificial skin. Many subjects perceived smooth, moist, and soft feels during the application process. Cluster analysis showed that these characteristic tactile feels are similar to those when skin-care cream is applied to real human skin. Contact angle analysis showed that an oil droplet spread smoothly on the artificial skin surface, which occurred because there were many grooves several hundred micrometers in width on the skin surface. In addition, when the skin-care cream was applied, the change in frictional force during the dynamic friction process increased. These wetting and frictional properties are important factors controlling the similarity of artificial skin to real human skin.