Influence of outsole structures on foot loading and gait stability - Solution for comfort and stability of leather high heels / Yihong Zhao in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 10 (10/2024)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 10 (10/2024) . - p. 438-447 Titre : Influence of outsole structures on foot loading and gait stability - Solution for comfort and stability of leather high heels Type de document : texte imprimé Auteurs : Yihong Zhao, Auteur ; Shiyang Yan, Auteur ; Wei Wang, Auteur ; Bolin Sun, Auteur ; Bi Shi, Auteur ; Luming Yang, Auteur Année de publication : 2024 Article en page(s) : p. 438-447 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chaussure à talon Chaussures -- Conception et construction Confort Cuir Semelle extérieure Talon (chaussure) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : As the downstream products most relevant to the leather industry, leather shoes perform well in the global market. Consumers have put forward high requirements for the comfort and safety of leather shoes in recent years, especially for high heels, whose unique outsole structure often causes foot overloading. The outsole structure varies in ground-contacted mode and heel base size, and plays a decisive role in its function, affecting gait patterns. This study aimed to investigate differences in foot loading and gait stability induced by different outsole structures, at two typical heel heights. Six pairs of customized high heels (3 outsole structures × 2 heel heights) were tested on eighteen healthy females while walking by the Novel Pedar-X in-shoe plantar pressure system. Taking the thick high heels for the intermediate control group, the main effects of the outsole structures and the heel heights, and their interactions on the plantar pressures were analyzed by Two-way repeated ANOVAs. The center of pressure displacements and velocities were calculated throughout the whole stance phase. The results indicated that the whole ground-contacted mode of the outsole displayed better stability in the medial-lateral direction in the early stance phase but may increase the risk of hallux valgus because of the elevated load there. On the contrary, the smaller heel base size exhibited poorer stability in the medial-lateral direction in the early stance phase and would increase forefoot loading. The response of gait characteristics to heel height change is more prominent, which could cause a more vulnerable gait posture. The results could be relevant to improving high-heel functional design, positively motivating the transformation and upgrading of the leather shoe industry. Note de contenu : - MATERIALS AND METHODS : - Participants - Customized leather shoes - Data acquisition - Data analysis for plantar pressure - Data analysis for COP trajectories - RESULTS AND DISCUSSION : - Effects of ground-contacted modes of the outsole on foot loading patterns - The effects of heel base size on foot loading patterns - The interaction effects of heel heights and ground-contacted modes on foot loading patterns - The interaction effect of heel height and heel base size on the loading patterns - The effects of ground-contacted mode and heel base size on gait stability - Table 1 : Differences between HMF and HFL in maximum forces and force-time integrals - Table 2 : Differences between HFS and HFL in maximum forces and force-time integrals DOI : https://doi.org/10.34314/wm9rqm56 En ligne : https://drive.google.com/file/d/1XErgWXcS1TB7M-23bieSwL1M97Bhe_m0/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41536 [article]

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Super robust, anti-bacterial polyurethane ionogel with high sensitivity and hydrophobicity / Wei Wang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 1 (01/2024)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 1 (01/2024) . - p. 31-40 Titre : Super robust, anti-bacterial polyurethane ionogel with high sensitivity and hydrophobicity Type de document : texte imprimé Auteurs : Wei Wang, Auteur ; Shiyang Yan, Auteur ; Yihong Zhao, Auteur ; Hao Liu, Auteur ; Luming Yang, Auteur ; Biyu Peng, Auteur Année de publication : 2024 Article en page(s) : p. 31-40 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens Capteurs de contraintes Caractérisation Cuirs et peaux -- Conservation gels ioniques Un gel ionique (ou Ionogel ) est un matériau composite constitué d'un liquide ionique immobilisé par une matrice inorganique ou polymère. Le matériau a la qualité de maintenir une conductivité ionique élevée à l'état solide. Pour créer un gel ionique, la matrice solide est mélangée ou synthétisée in situ avec un liquide ionique. Une pratique courante consiste à utiliser un copolymère séquencé qui est polymérisé en solution avec un liquide ionique afin de générer une nanostructure auto-assemblée où les ions sont sélectivement solubles. Les gels ioniques peuvent également être fabriqués à partir de polymères non copolymères tels que la cellulose, d'oxydes tels que le dioxyde de silicium ou de matériaux réfractaires tels que le nitrure de bore. (Wikipedia) Hydrophobie Polyuréthanes Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Ionogel based on ionic liquids plays a vital role in wearable electronic devices. In this study, a robust and anti-bacterial ionogel with high sensitivity and hydrophobicity is synthesized by adding 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide to thermoplastic polyurethanes at a ratio of 1:1. The ionogel not only demonstrates tensile strength of 23.1 MPa and elongation at break of 1008%, but also exhibits excellent fatigue resistance with low residual strain (8%) and small hysteresis loop. Ionic liquid makes the ionogel have high-temperature stability (T5% near 300°C) and low Tg (-63.3°C). Due to the anti-bacterial property of ionic liquid, the ionogel formed by ionic liquid has anti-bacterial property, with up to 99% inhibition against E. coli and S. aureus. The sensor prepared with the ionogel shows a Gauge Factor of 1.8, with a short response time (128 ms) and a stable induction signal under water and at low temperature. Due to those performance characteristics, we believe that the study could provide insights for subsequent research on ionogel-based wearable electronic devices, for instance, the development of electronic skin in the leather industry. Note de contenu : - EXPERIMENTAL : Materials - Preparation of TPU/IL ionogel - Characterization - RESULTS AND DISCUSSIONS : Preparation and structure of the ionogels - Stretchability of the ionogels - Environmental stability of the ionogels - Anti-bacterial property of the ionogels - The ionogels as strain sensor - The ionogel as human skin sensor DOI : https://doi.org/10.34314/jalca.v119i1.8293 En ligne : https://drive.google.com/file/d/16BZB7P5x1_NxWJWcP0QaXhlnZweuMAYb/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40347 [article]

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