著者

Yoshimune Nonomura Haruna Ogura Haruhi Niino Tatsunari Ueda Masashi Shibata

出版者

Japan Oil Chemists' Society

雑誌

Journal of Oleo Science (ISSN:13458957)

巻号頁・発行日

vol.72, no.4, pp.421-428, 2023 (Released:2023-03-30)

参考文献数

19

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Organogels are attractive formulations in cosmetics, food, and pharmaceuticals. They exhibit characteristic frictional and mechanical responses during the collapse of a mesostructure. In this study, the friction dynamics of organogels composed of five different waxes (paraffin wax, microcrystalline wax, ceresin, candelilla wax, and carnauba wax) and liquid paraffin were evaluated using a sinusoidal motion friction evaluation system. All organogels exhibited a velocity dependence of friction coefficient that increased with the acceleration of the contact probe. Depending on the ease of the crystal formation of the waxes in liquid paraffin, hydrocarbon-based waxes formed soft organogels with a low-friction coefficient, whereas ester-based, highly polar waxes formed organogels that were hard and had a high-friction coefficient.

著者

Yoshimune Nonomura Urara Tsuchiya Mayu Taguchi Reiichiro Tsuchiya Takehiro Goto

出版者

Japan Oil Chemists' Society

雑誌

Journal of Oleo Science (ISSN:13458957)

巻号頁・発行日

pp.ess22083, (Released:2022-07-06)

被引用文献数

2

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Frictional properties are one of the most important physical factors in the design of cosmetic dispersions in which solid particles are dispersed in a liquid. The effects of ingredients and formulations on frictional properties have been previously reported. In this study, the frictional properties of 33 cosmetic dispersions were evaluated using a sinusoidal motion friction evaluation system when applied on an artificial skin. A detailed analysis of the velocity dependence of the friction coefficient demonstrated that all cosmetic dispersions exhibited stabile pattern and the friction behavior did not change during the round trip. We analyzed friction-based parameters by principal component analysis and demonstrated that the principal components Z1 and Z2 include the static friction coefficient μs, kinetic friction coefficient μk, delay time δ, and viscosity coefficient C, and that these factors are involved in characterizing friction dynamics. The cluster analysis on Z1 and Z2 suggested that these dispersions can be classified in three groups with respect to friction dynamics. These results can help understand the characteristics of cosmetics and control their function and utility.

著者

Yoshimune Nonomura Momoka Sano Ryota Sekine Yoshiyuki Daikoku

出版者

Japan Oil Chemists' Society

雑誌

Journal of Oleo Science (ISSN:13458957)

巻号頁・発行日

pp.ess21210, (Released:2021-11-09)

被引用文献数

2

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Surface treatment of wood surface is an effective method to improve the physical properties. The friction dynamics of wood coated with vegetable oil were evaluated and compared to wood treated with polyurethane and untreated wood. The kinetic friction coefficient, µk, was 0.39±0.01, which was smaller than the values for polyurethane–treated wood and untreated oak. The effect of the surface treatment was also observed in the dependence of velocity on the friction coefficient. The friction profile of the wood surface treated with vegetable oil was similar to that of untreated wood, and the friction coefficient was nearly constant, except in the static friction region of sliding out. These results suggest that wood treated with vegetable oil is suitable for inducing a smooth feel.

著者

Minako Okukawa Yuika Yoshizaki 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.ess21090, (Released:2021-08-06)

被引用文献数

3

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Fatty acids and their derivatives are interesting cosmetic ingredients because they show the selective antibacterial activity against Staphylococcus aureus (S. aureus). However, the antibacterial activity in mixed systems containing several active ingredients is unclear because previous studies focused antibacterial systems containing one kind of fatty acid. In the present study, the minimal inhibitory concentration (MIC) and the fractional inhibitory concentration (FIC) were evaluated for myristic acid/lauric acid, myristic acid/palmitoleic acid, and myristic acid/lactic acid mixed systems to show the effect of the coexisting components on the selective antibacterial activity of myristic acid. In the myristic acid/palmitoleic acid mixed system, the antibacterial activity against S. aureus was enhanced by additive effect, whereas the antibacterial activity was not observed against S. epidermidis. On the other hand, the myristic acid/lauric acid mixed system showed antibacterial activity against S. epidermidis: Lauric acid impaired the selectivity of antibacterial activity of myristic acid. These results suggest that the selective activity of myristic acid varies with the additives. The present findings are useful for designing formulations of cosmetics and body cleansers containing myristic acid.

著者

Yuta Kato Rieko Kuhara Maki Sakamoto Reiichiro Tsuchiya Noboru Nagatani Yoshimune Nonomura

出版者

Japan Oil Chemists' Society

雑誌

Journal of Oleo Science (ISSN:13458957)

巻号頁・発行日

pp.ess20252, (Released:2021-01-15)

被引用文献数

5

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The Sara-sara feel, which means “a state in which things are not damp or sticky and feel dry,” is a preferred tactile sensation when people touch human skin, hair, clothing, and cosmetics. In this study, the Sara-sara feel was evaluated for silicone powder, cellulose powder, hydrophobized sericite powder, and various mixes of these powders. It was found that the highest Sara-sara feel score was achieved by the silicone powder. A multiple regression analysis showed that the Sara-sara feel was strongly correlated with a slippery feel. The relationship between certain physical properties, e.g., particle size distribution, and the slippery feel was analyzed to demonstrate how the subjects felt the slippery feel. It was observed that as the friction coefficient µk was reduced, most subjects strongly felt the slippery feel. This coefficient slightly decreased when the composition of spherical silicone powder increased, because the contact area between spherical particles is smaller than that between plate and amorphous particles.

著者

Yoshimune Nonomura Haruka Ouchi

出版者

Japan Oil Chemists' Society

雑誌

Journal of Oleo Science (ISSN:13458957)

巻号頁・発行日

pp.ess20012, (Released:2020-04-13)

被引用文献数

8

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This study includes an evaluation of friction on the fingers, palms, and forearms of 20 subjects using a sinusoidal motion friction evaluation system. The effects of the changing water content in the stratum corneum at each position as well as the skin elastic modulus on the friction parameters were analyzed to show the factors governing friction dynamics. We observed a significant delay time (δ) and a stick–slip phenomenon during the sinusoidal motion friction processes. These dynamic phenomena are due to the softness and viscoelastic properties of human skin. The findings regarding the response of human skin to frictional stimulation under accelerated conditions facilitates a better understanding of the dynamic and mechanical properties of human skin.

著者

Hina Okawara Koki Shinomiya Yoshimune Nonomura

出版者

Japan Oil Chemists' Society

雑誌

Journal of Oleo Science (ISSN:13458957)

巻号頁・発行日

pp.ess19099, (Released:2019-08-14)

被引用文献数

6

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Gels exhibit complex friction behavior. This study aims to evaluate the friction forces between two fractal agar gel substrates under sinusoidal motion to show the effect of rough surfaces on friction dynamics. In a previous study, we observed an asymmetric friction profile during reciprocating motion and an ultra-low friction state on flat agar gel surfaces. On the other hand, these distinct friction profiles were not observed on rough agar gel surfaces. We determined that this distinction was caused by the contact state between fractal agar gel surfaces; no thick water film was formed on the fractal surfaces because the rough structure provided channels to drain water from the interface. These physical insights are useful not only for developing biofunctional materials but also for understanding surface phenomena on biosurfaces including tongues and small intestinal walls.

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)

被引用文献数

8

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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

17

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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)

被引用文献数

12

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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

17

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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

Ayano Kudo Marika Sato Haruna Sawaguchi Jun-ichi Hotta 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.65, no.11, pp.909-912, 2016 (Released:2016-11-01)

参考文献数

12

被引用文献数

3

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In the present study, mechanical phenomena on fractal agar gel were analyzed to understand the interfacial properties of hydrophilic biosurfaces. The evaluation of adhesion strength between the fractal agar gel surfaces showed that the fractal structure inhibits the adhesion between the agar gel surfaces. In addition, when the disintegration behavior of an agar gel block was observed between fractal agar gel substrates, the rough structure prevented the sliding of an agar gel block. These findings are useful for understanding the biological significance of rough structure on the biological surfaces.

著者

Haruna SAWAGUCHI Jiale XU Takahiro KAWAI Takashi MINETA Yoshimune NONOMURA

出版者

公益社団法人 日本セラミックス協会

雑誌

Journal of the Ceramic Society of Japan (ISSN:18820743)

巻号頁・発行日

vol.124, no.6, pp.753-756, 2016-06-01 (Released:2016-06-01)

参考文献数

16

被引用文献数

4

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Apatite-coated silicon wafers are expected to be utilized for novel biosensors or implants. However, the mechanism and optimum conditions for the formation of an apatite layer on silicon wafer surfaces are unclear. Herein, we examined the effect of pretreating silicon wafers with titanium sputtering and weak alkali aqueous solutions before immersing them in a simulated body fluid (SBF). A week after immersion, silicon wafer surfaces coated with thin titanium layers were covered by hemispherical apatite particles that were produced in a heterogeneous nucleation reaction, whereas untreated silicon wafer surfaces were covered by spherical particles that were produced in a homogeneous reaction. Pretreatment of titanium-coated silicon wafers with 0.1 M NaOH aqueous solution assured heterogeneous apatite formation. Both titanium-coated and untreated silicon wafers were fully covered by the apatite layer after soaking in the SBF for 2–3 weeks. These findings show that pretreatment of silicon wafers with titanium sputtering and weak alkali aqueous solution is effective for obtaining apatite-coated silicon wafers.

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

pp.ess14176, (Released:2015-02-09)

被引用文献数

2 22

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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

Haruna Sawaguchi Hiroshi Nishida Takahiro Kawai 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

pp.150005, (Released:2015-02-14)

被引用文献数

1

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We prepared an apatite/polymer composite material with a fractal surface by transferring the hierarchical rough surface of a plaster replica onto calcium phosphate paste and immersing the paste in buffer. The rough structure (fractal dimension = 2.3) accelerated the spreading and penetration of a water droplet placed on the surface. This material can be applied in dental implants and texture testers.

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

pp.151033, (Released:2015-12-16)

被引用文献数

1

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The friction behavior of water and thickener aqueous solutions was evaluated between a contact probe with a striped rough surface and a substrate. When the probe surface is flat, the contact state is boundary lubrication and fluid film lubrication states for water and thickener aqueous solutions, respectively. In contrast, in the case of 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 change the regime of friction.

著者

Yoshimune Nonomura Eri Seino Saya Abe Hiroyuki Mayama

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.62, no.8, pp.587-590, 2013 (Released:2013-08-27)

参考文献数

12

被引用文献数

1 6

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The elastomer materials with hieralchical structure and suitable wettability are useful as biological surface model. In the present study, urethane resin and silicone resin elastomers with hierarchical rough surfaces were prepared and referred to as “fractal elastomers”. We found a hierarchy of small projections that existed over larger ones on these surfaces. These elastomers were synthesized by transferring a fractal surface structure of alkylketene dimer. The rough structure enhanced the hydrophobicity and weakened friction resistance of the elastomer surfaces. These materials can be useful for artificial skin with biomimetic surface properties.

著者

Yoshimune NONOMURA Hitoshi HATANO Kazuki FUKUDA Hidenari INOUE

出版者

(社)日本分析化学会

雑誌

Analytical Sciences (ISSN:09106340)

巻号頁・発行日

vol.10, no.1, pp.117-119, 1994-02-10 (Released:2006-07-04)

参考文献数

15

被引用文献数

4 7

著者

Takako Hikima Yoshimune Nonomura

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.37, no.3, pp.338-339, 2008-03-05 (Released:2008-02-16)

参考文献数

9

被引用文献数

10

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We successfully powderized keratin fibers under mild conditions. Wool keratin was hydrolyzed in a binary system, consisting of a higher alcohol phase and an alkali aqueous solution phase.

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

pp.130307, (Released:2013-05-30)

被引用文献数

8

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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.