Bio-based flooring adhesive modeled on spider silk / Lorenzo Tomei in ADHESION - ADHESIVES + SEALANTS, Vol. 21, N° 2/2024 (2024)  

[article]  inADHESION - ADHESIVES + SEALANTS > Vol. 21, N° 2/2024 (2024) . - p. 26-31 Titre : Bio-based flooring adhesive modeled on spider silk Type de document : texte imprimé Auteurs : Lorenzo Tomei, Auteur ; Daniela Leistl, Auteur Année de publication : 2024 Article en page(s) : p. 26-31 Langues : Multilingue (mul) Catégories : Adhésifs biologiques Biomatériaux Chlorure de polyvinyle Revêtements de sols Soie d'araignée Les fibres de soie sont formées de fibroïnes (protéines filamenteuses, appelées aussi spidroïnes2, composées de copolymères à blocs hydrophiles et hydrophobes) constituées à 25-30 % d'alanine et à 40% de glycine. La soie d'araignée est un polymère dont la configuration moléculaire peut varier et rapidement s'adapter à la température et à l'humidité, ce qui fascine les chercheurs en biomimétique ou en robotique. La soie d'araignée est notamment capable de « Supercontraction » (de 10 à 140 MPa de tension) quand elle s'humidifie (en plusieurs minutes quand l'hygrométrie dépasse 70 %), et plus rapidement quand elle est subitement mouillée. C'est ainsi que les toiles peuvent résister à la pluie, et au poids de la rosée voire accumuler plusieurs grammes d'eau sous forme de gouttes, à partir de la bruine par exemple. La thermostabilité varie aussi selon le degré de supercontraction Structures multicouches Index. décimale : 668.3 Adhésifs et produits semblables Résumé : Adhesives have to meet a wide variety of requirements that range from high levels of adhesion to easy removability. However, it is hard to achieve both these properties at the same time. In the case of floor coverings, the emphasis is often on adhesion, which can make the flooring difficult to remove. In addition, fossil-based adhesives raise concerns about sustainability and recycling. One solution to these problems is a bio-based adhesive system. Note de contenu : - The biological principle for the adhesive application - The versatility of plant-based raw materials - Plant waxes guarantee adhesion - Creation of a bio-based prototype - Fig. 1 : PVC is a material which is widely used in floor coverings, but which usually requires the use of fossil-based adhesives to create a lasting bond - Fig. 2 : Spider webs are sophisticated naturel solutions for catching prey. Their biological principle is based on adhesion - Fig. 3 : Model of the adhesive mechanism of cribellate spider webs (right) compared with ecribellate spider webs with spider glue (left), as described by Bott et al. (2017) - Fig. 4 : Fibers of a cribellate spider web (A) and nanofibrils that form the convoluted nanoporous structure (B, C), as described by Hawthorn et al. (2003) - Fig. 5 : The foaming capacity and foam stability of plant proteins allows the formation microscopic air bubbles that replicate the porosity of the cribellate spider web threads in the final structure - Fig. 6 : The structure of the plant protein foam, with additives made from cellulose and its derivatives, after thermal stabilization - Fig. 8 : The individual elements of the bonded system as a prototype in A4 format : screed, plant was emulsion, PVC floor covering coated withthe stabilized protein foam - Fig. 9 : Cross section of the A4 prototype showing the structure of the layers - Fig. 10 :Assembly of the bonded system starting with a PVC floor covering coated with the biomimetic spider web and finishing with the bonding of the floor covering to the screed using the tried-and-tested biological principle - Fig. 11 : The bio-based adhesive is a multilayer system that quarantees adequate adhesion between the floor covering and the screed and removability for potential recycling En ligne : https://drive.google.com/file/d/10sWyTDkd1x5cZpKEL31YKmH77k3f1Jco/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41191 [article]

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Cosmetic ingredients with the power of plant defense mechanisms / Daniela Leistl in SOFW JOURNAL, Vol. 149, N° 11 (11/2023)  

[article]  inSOFW JOURNAL > Vol. 149, N° 11 (11/2023) . - p. 2-5 Titre : Cosmetic ingredients with the power of plant defense mechanisms Type de document : texte imprimé Auteurs : Daniela Leistl, Auteur ; Sandra Kiese, Auteur ; Arielle Springer, Auteur Année de publication : 2023 Article en page(s) : p. 2-5 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cacaoyer et constituants Ingrédients cosmétiques Index. décimale : 668.5 Parfums et cosmétiques Résumé : Cocoa butter is very popular as an ingredient in cosmetic products. However, cosmetic cocoa butter is often offered in food quality, which tightens the market supply. At the same time, large parts of the cocoa crop are discarded due to diseases, even though the plant produces particularly interesting ingredients while combating diseases. These ingredients could provide valuable properties for cosmetic products as protein or secondary plant metabolite extracts or cocoa butter and would be safe to use. This will create a second raw material stream that will relieve the supply of food-grade raw materials and provide many other dermatological and environmental benefits. Note de contenu : - Traditional cocoa bean processing for the production of cocoa powder and chocolate - Influence of cocoa specific diseases on cocoa beans composition - Potential of damaged cocoa beans - Process development for the recovery of damaged cocoa beans - Figure : Traditional cocoa bean processing according to - Table 1 : Changes in ethylene, alkaolid and tannin content due to diseases compared to healthy cocoa beans - Table 2 : Quality assessment of different cocoa bean fractions En ligne : https://drive.google.com/file/d/1Q7Y_QPoHtajEX7HKfO_B4EQQuTDhElMm/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40379 [article]

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Plant extracts : sustainable and multifunctional cosmetic ingredients / Sandra Kiese in SOFW JOURNAL, Vol. 150, N° 1/2 (01-02/2024)  

[article]  inSOFW JOURNAL > Vol. 150, N° 1/2 (01-02/2024) . - p. 24-29 Titre : Plant extracts : sustainable and multifunctional cosmetic ingredients Type de document : texte imprimé Auteurs : Sandra Kiese, Auteur ; Arielle Springer, Auteur ; Daniela Leistl, Auteur Année de publication : 2024 Article en page(s) : p. 24-29 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antioxydants Développement durable Extraits de plantes Extraits de plantes:Extraits (pharmacie) Ingrédients cosmétiques Matériaux -- Propriétés fonctionnelles Peau -- Soins et hygiène Produits antisolaires Tanins végétaux Index. décimale : 668.5 Parfums et cosmétiques Résumé : The cosmetics industry is in the midst of a significant shift, driven by consumer demand for both natural and sustainable ingredients. This transformation is accelerated by concerns on conventional components like UV filters, known for potential environmental degradation and endocrine disruption. Despite the urgency, natural UV-absorbing alternatives based on chemical light absorption remain scarce. Secondary plant substances (SPS), particularly water-soluble tannins, present a promising possibility. This study investigated the reducing capacities, antioxidant activity, tannin contents, and UV-absorption properties of various plant-based extracts mainly obtained from by-products and residues from the agricultural and food industry. By utilizing side-streams, emerging ingredients are potential factors to contribute to the sustainability of cosmetics. The results revealed that bark and tea grounds exhibited the highest reducing capacities and antioxidant activities, making them potential natural sources. Fruit peels, however, showed relatively low antioxidant capacities. Tannin contents varied significantly among the samples, with wine pomace and bark having the highest levels. The UV-absorption measurements indicated that the extracts had the ability to block UV-A and even some visible light, except for fruit peels and nut shell extracts, which were less suitable for UV protection. These findings provide valuable insights into the properties and potential applications of these natural extracts. Note de contenu : - Plant extracts in cosmetics : sustainable efficacy - Materials and method - Results and discussion - Benefits for raw material and product manufacturers in the chemical and cosmetic industry En ligne : https://drive.google.com/file/d/1zZTi1XoqTmOlDrnzzVf3odPJJcXASjSw/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40707 [article]

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