Mechanical Properties of Boehmite Evaluated by Atomic Force Microscopy Experiments and Molecular Dynamic Finite Element Simulations

Fankhänel, Johannes; Silbernagl, Dorothee; Khorasani, Media Ghasem Zadeh; Daum, B.; Kempe, Andreas; Sturm, Heinz; Rolfes, Raimund

doi:10.1155/2016/5017213

Cited by 39 publications

(33 citation statements)

References 28 publications

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“…Based on the crystalline structure, the Young's modulus should be direction‐dependent. This has been confirmed by theoretical calculations yielding values between 136 GPa (010) and 267 GPa (001) . Experimental results, derived from atomic force microscopy measurements, yielded values in the 10 GPa range.…”

Section: The Structure and Properties Of Basupporting

confidence: 63%

“…Determination of the crystalline structure of BA was a puzzle for scientists in the past, mostly due to its inhomogeneous structure and water content. It is accepted nowadays that γ‐AlO(OH) has an orthorhombic unit cell . The crystal structure of BA consists of double layers of oxygen octahedrons with a central Al atom.…”

Section: The Structure and Properties Of Bamentioning

confidence: 99%

“…Accordingly, Al is surrounded by six oxygen atoms in a distorted AlO 6 octahedron . The oxygen on the side is bonded via an H‐bond to hydrolyzed groups of the neighboring layer of octahedrons . Figure shows a two‐dimensional (2D) projection of the crystalline structure.…”

Section: The Structure and Properties Of Bamentioning

confidence: 99%

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Polymer/boehmite nanocomposites: A review

Karger‐Kocsis

Lendvai

2017

J of Applied Polymer Sci

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Boehmite is an aluminum oxyhydroxide [AlO(OH)] which is preferentially used as precursor for the production of (transition) aluminum oxides. Boehmite alumina (BA) nanoparticles are available in various morphologies due to versatile synthesis routes, which are briefly introduced. The peripheral hydroxyl groups of BA offer manifold functionalization possibilities for tailoring the dispersion and filler/matrix adhesion properties. The incorporation of BA nanofillers, with and without surface treatments, may yield improved mechanical and novel functional properties in polymers. BA can be introduced in polymers and polymer composites through different methods. This comprehensive overview covers the basic results reported on polymer/BA nanocomposites in the open literature. In this review, polymer matrices are grouped into thermoplastics, thermosets, and rubbers. Using literature results and our own findings, we have identified promising R&D trends with polymer/BA nanocomposites. V C 2017 Wiley Periodicals, Inc. J.Appl. Polym. Sci. 2018, 135, 45573.

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Section: The Structure and Properties Of Basupporting

confidence: 63%

Section: The Structure and Properties Of Bamentioning

confidence: 99%

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Polymer/boehmite nanocomposites: A review

Karger‐Kocsis

Lendvai

2017

J of Applied Polymer Sci

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“…In the limit case of a complete surface loading, no chemical bonds between particle and matrix exist. For further information on the model generation, especially on the particle-matrix bonding of the unmodified boehmite, refer to the authors' previous work [11,16].…”

Section: Numerical Methods and Modelsmentioning

confidence: 99%

“…1 b) and a primary particle size of 14 nm are used (DISPERAL HP14, SASOL). Boehmite behaves mechanically ambivalent with respect to the stiffness caused by the layered structure, as discussed in detail by Fankhänel et al [16]. Kango et al [5] state that inorganic nanoparticles are inclined to form agglomerates and thus should be modified to improve the dispersion stability and the compatibility of the particle and the matrix.…”

Section: Boehmitementioning

confidence: 99%

Mechanical properties of epoxy/boehmite nanocomposites in dependency of mass fraction and surface modification - An experimental and numerical approach

Jux

Fankhänel

Daum

et al. 2018

Polymer

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Boehmite nanoparticles show great potential in improving the matrix dominated mechanical properties of fiber reinforced polymers. For the material design process and the prediction of the nanocomposite's properties, knowledge about the material behavior of the constituent phases and their interactions is crucial. Since the chemical composition of the particle surface can strongly affect the interaction between particle and matrix, the influence of particle surface modification and mass fraction on mechanical properties (tensile modulus, tensile strength, fracture toughness) and failure mechanisms of nanoparticle reinforced epoxy resins is investigated using experimental and numerical methods. In the present work, unmodified and thus chemically reactive boehmite particles are compared to acetic acid modified particles with supposedly lower chemical reactivity and thus worse particle-matrix bonding. A linear relationship between particle mass fraction and tensile modulus/fracture toughness is experimentally found with a maximum increase of 26 % in tensile modulus and 62 % in critical energy release rate for a particle content of 15 wt%. Furthermore, the experiments indicate that the acetic acid surface modification increases the tensile modulus (up to 6 % compared to the unmodified boehmite particles), but at the same time not significantly affects the tensile strength or the fracture toughness. Molecular Dynamic Finite Element Method (MDFEM) simulations are conducted to identify and understand the mechanisms induced by nanoparticles. The material properties of both, modified and unmodified, nanoparticle systems are discussed in relation to the change of particle-matrix bonding strength and interphase morphology. While simulation results of the unmodified system show an outstanding agreement with the experiments, the acetic acid modified system deviates significantly. In conclusion, it seems that additional effects have to be considered to completely understand the material behavior.

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Nanomechanical study of polycarbonate/boehmite nanoparticles/epoxy ternary composite and their interphases

Murillo

Khorasani

Silbernagl

et al. 2020

J of Applied Polymer Sci

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Thermoplastic modified thermosets are of great interest especially due to their improved fracture toughness. Comparable enhancements have been achieved by adding different nanofillers including inorganic particles such as nanosized boehmite. Here, we present a nanomechanical study of two composite systems, the first comprising a polycarbonate (PC) layer in contact with epoxy resin (EP) and the second consisting of a PC layer containing boehmite nanoparticles (BNP) which is also in contact with an EP layer. The interaction between PC and EP monomer is tested by in situ Fourier transformed infrared (FT‐IR) analysis, from which a reaction induced phase separation of the PC phase is inferred. Both systems are explored by atomic force microscopy (AFM) force spectroscopy. AFM force‐distance curves (FDC) show no alteration of the mechanical properties of EP at the interface to PC. However, when a PC phase loaded with BNP is put in contact with an epoxy system during curing, a considerable mechanical improvement exceeding the rule of mixture was detected. The trend of BNP to agglomerate preferentially around EP dominated regions and the stiffening effect of BNP on EP shown by spatial resolved measurements of Young's modulus, suggest the effective presence of BNP within the EP phase.

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Mechanical Properties of Boehmite Evaluated by Atomic Force Microscopy Experiments and Molecular Dynamic Finite Element Simulations

Cited by 39 publications

References 28 publications

Polymer/boehmite nanocomposites: A review

Polymer/boehmite nanocomposites: A review

Mechanical properties of epoxy/boehmite nanocomposites in dependency of mass fraction and surface modification - An experimental and numerical approach

Nanomechanical study of polycarbonate/boehmite nanoparticles/epoxy ternary composite and their interphases

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