Biomimetics - Architectural Considerations for Functional Nanocomposites

Jason R. McKee

Biomimetics - Architectural Considerations for Functional Nanocomposites

Julkaisun otsikon käännös: Biomimetiikka - Tutkimuksia toiminnallisten nanomateriaalien rakenteista

Jason R. McKee

Teknillisen fysiikan laitos

Tutkimustuotos: Doctoral Thesis › Collection of Articles

Abstrakti

Tämä opinnäytetyö keskittyy synteettisiin nanomateriaaleihin, jotka yhdistävät kovan nanoselluloosavahvistuksen pehmeisiin toiminnallisiin synteettisiin polymeereihin. Kaikki työssä esiteltävät molekulaariset arkkitehtuurit ovat saaneet innoituksensa luonnon nanokomposiiteista, kuten silkistä, luusta ja kasvikuiduista. Luonnonmateriaalit koostuvat tyypillisesti vahvistavista nanokokoisista alueista, jotka on sidottu yhteen supramolekulaarisilla uhrautuvilla sidoksilla. Niiden rakennusaineina ovat proteiinit, hiilihydraatit ja hauraat mineraalit. Komponentit ovat erillään yleensä mekaanisesti heikkoja, mutta sopivissa hierarkkisissa rakenteissa ne tasapainottavat ja tukevat toisiaan. Näin ollen työn tärkeimpiä sisältöjä on edellä mainittujen nanokomposiittien osien rakenteellinen suunnittelu, jotta halutut mekaaniset ominaisuudet voidaan saavuttaa. Yhteensopivuusongelmat vahvistavan nanoselluloosan ja synteettisten supramolekulaaristen verkkorakenteiden välillä ovat myös yksi keskeinen teema. Jokainen materiaali on suunniteltu niin, että kaikki kolloidaaliset komponentit saadaan homogeenisesti dispergoiduksi polymeeriverkostoon. Tällöin verkkorakenne saadaan mahdollisimman tehokkaasti vahvistettua ja toimimaan samalla yhteen luonnon inspiroiminen supramolekulaaristen verkkorakenteiden kanssa. Lopuksi, nanokomposiitteihin saatiin spesifisiä funktionaalisuuksia supramolekulaarisen sitoutumisen tai funktionaalisten polymeerien avulla. Ensimmäisessä julkaisussa kuvataan hyvin dynaaminen supramolekulaarinen nanokomposiittihydrogeeli, joka on hyvin jäykkä, kuten kiinteät elastiset verkkorakenteet, itsekorjautuu sekunneissa ja kykenee korjaamaan itsensä vielä pitkän säilytysajan jälkeenkin. Toisessa julkaisussa yksikomponenttisia nanokomposiitteja muokattiin biomimeettisillä uhrautuvilla sidoksilla. Murtumisenergian dissipaation lisääntyessä lasimaisen nanokomposiittien sitkeys parani huomattavasti. Kolmannessa ja neljännessä julkaisussa valmistettiin funktionaalisia nanokomposiittihydrogeelejä. Kolloidaalista nanoselluloosaa ristisilloitettiin fysikaalisesti adsorboimalla funktionaalisia polysakkarideja niiden pinnalle. Ensimmäiseksi valmistettiin lämpöherkkä nanokomposiitti, jonka moduulia voitiin muuttaa lämpötilan funktiona. Toiseksi sekä moduulia ja myötärajaa parannettiin lisäämällä nanofibrillaariseen verkkorakenteeseen itselinkittynyt uhrautuva verkkorakenne. Nämä nanoselluloosaan perustuvat materiaalit tuovat lupaavia uusia konsepteja nanomateriaalien kehittelyyn sekä ennennäkemättömiä mekaanisten ominaisuuksien ja toiminnallisuuksian yhdistelmiä.

Julkaisun otsikon käännös	Biomimetiikka - Tutkimuksia toiminnallisten nanomateriaalien rakenteista
Alkuperäiskieli	Englanti
Pätevyys	Tohtorintutkinto
Myöntävä instituutio	Aalto-yliopisto
Valvoja/neuvonantaja	Ikkala, Olli, Vastuuprofessori Ikkala, Olli, Ohjaaja
Kustantaja	Aalto University
Painoksen ISBN	978-952-60-6034-7
Sähköinen ISBN	978-952-60-6035-4
Tila	Julkaistu - 2015
OKM-julkaisutyyppi	G5 Artikkeliväitöskirja

Tutkimusalat

nanomateriaalit
molekylaarinen itseohjautuminen
polymeerit
kolloidit

Pääsy asiakirjaan

http://urn.fi/URN:ISBN:978-952-60-6035-4Lisenssi: Määrittelemätön

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@phdthesis{1bfb139cd42644a986684e1bf90f76f5,

title = "Biomimetics - Architectural Considerations for Functional Nanocomposites",

abstract = "This thesis will focus on synthetic nanomaterials that combine hard nanocellulose reinforcement with soft molecularly engineered synthetic polymeric components. The architectural designs have all been inspired by natural nanocomposites, such as silk, animal bone and plant fibres. Typically, the design of natural structures are built around hard reinforcing nanodomains bound together by energy dissipating sacrificial networks. These natural materials consist of proteins, carbohydrates or brittle minerals. Separately each component is usually mechanically weak; however, when combined in the balanced and hierarchical ways, each component will synergistically contribute towards mechanically excellent networks, by combining strength, toughness and stiffness. Hence, one of the main focuses in this thesis will be the structural design of the constituting components and how they relate to the mechanical properties of the overall composites. Another key feature is the compatibility issues between the reinforcing nanocellulose with the synthetic supramolecular networks. Each material has been designed in a way that yields a homogeneous dispersion of all colloidal components. This allows more efficient reinforcment as well as allows the components to more effectively together. And finally, specific functionalities were engineered into the nanocomposite materials either through the supramolecular binding or by the use of functional polymers. In Publication I, highly dynamic supramolecular nanocomposite hydrogels were developed that uniquely combine: high stiffness, approaching those of solid elastic networks; self-healing within seconds; and temporal stability, allowing for self-healing of the exposed surface areas even after prolonged storage. In Publication II, biomimetic sacrificial bonds were chemically engineered into one-component nanocomposites. This resulted in engineered fracture energy dissipation, which considerably increased the toughness of the glassy nanocomposite. In Publications III and IV, functional nanocomposite hydrogels were formed by linking colloidal nanocellulose by adsorbing functional polysaccharides onto the surface. In the first example, a thermoresponsive nanocomposite with switchable modulus was shown. In the second example, both the modulus and yield-strain were enhanced by adding an interconnected sacrificial network into the nanofibrillar network. These nanocellulose-based nanocomposites demonstrate promising new concepts for material design as well as never before seen combinations of mechanical properties and functionalities.",

keywords = "nanomaterials, supramolecular self-assembly, polymers, colloids, nanomateriaalit, molekylaarinen itseohjautuminen, polymeerit, kolloidit, nanomaterials, supramolecular self-assembly, polymers, colloids",

author = "McKee, {Jason R.}",

year = "2015",

language = "English",

isbn = "978-952-60-6034-7",

series = "Aalto University publication series DOCTORAL DISSERTATIONS",

publisher = "Aalto University",

number = "2",

address = "Finland",

school = "Aalto University",

}

TY - BOOK

T1 - Biomimetics - Architectural Considerations for Functional Nanocomposites

AU - McKee, Jason R.

PY - 2015

Y1 - 2015

N2 - This thesis will focus on synthetic nanomaterials that combine hard nanocellulose reinforcement with soft molecularly engineered synthetic polymeric components. The architectural designs have all been inspired by natural nanocomposites, such as silk, animal bone and plant fibres. Typically, the design of natural structures are built around hard reinforcing nanodomains bound together by energy dissipating sacrificial networks. These natural materials consist of proteins, carbohydrates or brittle minerals. Separately each component is usually mechanically weak; however, when combined in the balanced and hierarchical ways, each component will synergistically contribute towards mechanically excellent networks, by combining strength, toughness and stiffness. Hence, one of the main focuses in this thesis will be the structural design of the constituting components and how they relate to the mechanical properties of the overall composites. Another key feature is the compatibility issues between the reinforcing nanocellulose with the synthetic supramolecular networks. Each material has been designed in a way that yields a homogeneous dispersion of all colloidal components. This allows more efficient reinforcment as well as allows the components to more effectively together. And finally, specific functionalities were engineered into the nanocomposite materials either through the supramolecular binding or by the use of functional polymers. In Publication I, highly dynamic supramolecular nanocomposite hydrogels were developed that uniquely combine: high stiffness, approaching those of solid elastic networks; self-healing within seconds; and temporal stability, allowing for self-healing of the exposed surface areas even after prolonged storage. In Publication II, biomimetic sacrificial bonds were chemically engineered into one-component nanocomposites. This resulted in engineered fracture energy dissipation, which considerably increased the toughness of the glassy nanocomposite. In Publications III and IV, functional nanocomposite hydrogels were formed by linking colloidal nanocellulose by adsorbing functional polysaccharides onto the surface. In the first example, a thermoresponsive nanocomposite with switchable modulus was shown. In the second example, both the modulus and yield-strain were enhanced by adding an interconnected sacrificial network into the nanofibrillar network. These nanocellulose-based nanocomposites demonstrate promising new concepts for material design as well as never before seen combinations of mechanical properties and functionalities.

AB - This thesis will focus on synthetic nanomaterials that combine hard nanocellulose reinforcement with soft molecularly engineered synthetic polymeric components. The architectural designs have all been inspired by natural nanocomposites, such as silk, animal bone and plant fibres. Typically, the design of natural structures are built around hard reinforcing nanodomains bound together by energy dissipating sacrificial networks. These natural materials consist of proteins, carbohydrates or brittle minerals. Separately each component is usually mechanically weak; however, when combined in the balanced and hierarchical ways, each component will synergistically contribute towards mechanically excellent networks, by combining strength, toughness and stiffness. Hence, one of the main focuses in this thesis will be the structural design of the constituting components and how they relate to the mechanical properties of the overall composites. Another key feature is the compatibility issues between the reinforcing nanocellulose with the synthetic supramolecular networks. Each material has been designed in a way that yields a homogeneous dispersion of all colloidal components. This allows more efficient reinforcment as well as allows the components to more effectively together. And finally, specific functionalities were engineered into the nanocomposite materials either through the supramolecular binding or by the use of functional polymers. In Publication I, highly dynamic supramolecular nanocomposite hydrogels were developed that uniquely combine: high stiffness, approaching those of solid elastic networks; self-healing within seconds; and temporal stability, allowing for self-healing of the exposed surface areas even after prolonged storage. In Publication II, biomimetic sacrificial bonds were chemically engineered into one-component nanocomposites. This resulted in engineered fracture energy dissipation, which considerably increased the toughness of the glassy nanocomposite. In Publications III and IV, functional nanocomposite hydrogels were formed by linking colloidal nanocellulose by adsorbing functional polysaccharides onto the surface. In the first example, a thermoresponsive nanocomposite with switchable modulus was shown. In the second example, both the modulus and yield-strain were enhanced by adding an interconnected sacrificial network into the nanofibrillar network. These nanocellulose-based nanocomposites demonstrate promising new concepts for material design as well as never before seen combinations of mechanical properties and functionalities.

KW - nanomaterials

KW - supramolecular self-assembly

KW - polymers

KW - colloids

KW - nanomateriaalit

KW - molekylaarinen itseohjautuminen

KW - polymeerit

KW - kolloidit

KW - nanomaterials

KW - supramolecular self-assembly

KW - polymers

KW - colloids

M3 - Doctoral Thesis

SN - 978-952-60-6034-7

T3 - Aalto University publication series DOCTORAL DISSERTATIONS

PB - Aalto University

ER -

Biomimetics - Architectural Considerations for Functional Nanocomposites

Abstrakti

Tutkimusalat

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