Mechanical properties of ceramics reinforced with allotropic forms of carbon

Morales‐Flórez, Víctor; Domínguez‐Rodríguez, Arturo

doi:10.1016/j.pmatsci.2022.100966

Cited by 28 publications

(20 citation statements)

References 488 publications

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“…FESEM images (Figure A–C) of fracture cross sections of the amorphous isomalt materials reveal the stark difference in crack formation between pure isomalt (control) (Figure A) and the amorphous isomalt materials (Figure B,C). The absence of cracks in amorphous isomalt materials is consistent with observations in which well-dispersed additives obstruct crack propagation and increase the strength of the materials. , The absence of cracks also explains why amorphous isomalt materials are less brittle than pure isomalt, the latter of which has been used to make easily breakable movie props and delicate, three-dimensional printed shapes. , …”

Section: Resultssupporting

confidence: 81%

“…The absence of cracks in amorphous isomalt materials is consistent with observations in which well-dispersed additives obstruct crack propagation and increase the strength of the materials. 29,30 The absence of cracks also explains why amorphous isomalt materials are less brittle than pure isomalt, the latter of which has been used to make easily breakable movie props and delicate, three-dimensional printed shapes. 13,14 Compatibility with Industrial-Scale Manufacturing.…”

Section: ■ Introductionmentioning

confidence: 99%

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Amorphous Sugar Materials as Sustainable and Scalable Alternatives for Rigid, Short-Term-Use Products

Miller-Cassman

Nogales

Phillips

2023

ACS Sustainable Chem. Eng.

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Plastics are the prevailing materials for short-term-use applications, despite being designed to last far longer than often is needed or desired. This article describes a class of materials that are formed from small-molecule sugars, rather than polymers, as a scalable and environmentally friendly replacement for rigid thermoplastics for short-term-use applications. The materials use amorphous isomalt as a matrix and natural additives to tune the mechanical properties. Like plastics, this class of materials is lightweight and can be produced efficiently at low temperatures via injection molding, yet the materials emulate the rigidity and strength of ceramics and stones. Repeated recycling is achieved via a closed-loop process without degradation of the isomalt binder and without loss of mechanical properties. Finally, these materials are resistant to water for hours when coated, yet ultimately dissolve within minutes when broken, with the resulting products being nontoxic small-molecule and degradable biobased materials. This combination of traits makes amorphous isomalt materials suitable as an alternative to persistent plastics in short-term-use applications.

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Section: Resultssupporting

confidence: 81%

Section: ■ Introductionmentioning

confidence: 99%

Amorphous Sugar Materials as Sustainable and Scalable Alternatives for Rigid, Short-Term-Use Products

Miller-Cassman

Nogales

Phillips

2023

ACS Sustainable Chem. Eng.

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“…In such a system, the worsening of the mechanical properties was attributed to a poor and non‐homogenous carbon nanotube dispersion within the composites. Hence, the formation of clusters of carbon nanotubes within the matrix often tend to concentrate the stresses or even act as defects and crack initiators, provokes more fragile materials 34,48–50 . Thus, the optimal parameters used from now on are: (i) tip‐to‐collector distance = 18 cm, (ii) flow rate = 1 ml/h, (iii) PAN content = 12 wt% and MWCNT content = 0.05 wt%.…”

Section: Resultsmentioning

confidence: 99%

“…Hence, the formation of clusters of carbon nanotubes within the matrix often tend to concentrate the stresses or even act as defects and crack initiators, provokes more fragile materials. 34,[48][49][50] Thus, the optimal parameters used from now on are: (i) tip-to-collector distance = 18 cm, (ii) flow rate = 1 ml/h, (iii) PAN content = 12 wt% and MWCNT content = 0.05 wt%. As depicted in the materials and methods section, we have prepared a set of glass-fiber epoxy composites (GFECs) reinforced with Electrospun-Fiber Mats (EFMs) based on PAN/MWCNTs and using different glass-fiber sources: (a) GF3M, (b) GF600, and (c) GF800.…”

Section: Structural and Mechanical Characterization Of Pan/mwcnt Fibe...mentioning

confidence: 99%

Improving glass‐fiber epoxy composites via interlayer toughening with polyacrylonitrile/multiwalled carbon nanotubes electrospun fibers

Narváez‐Muñoz

Zamora‐Ledezma

Ryzhakov

et al. 2022

J of Applied Polymer Sci

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The development of innovative engineered epoxy composites aiming to manufacture cost-efficient materials with reduced weight and enhanced physical properties remains as a current industrial challenge. In this work we report an original procedure for manufacturing glass-fiber epoxy reinforced nanocomposites (GFECs) by employing electrospun fiber-mats as a reinforcing phase. These fibers have been produced from polyacrylonitrile and multiwalled carbon nanotubes solutions. Optimal protocols are designed by combining Taguchi method with the morphological, structural and mechanical properties obtained by scanning electron microscopy, profilometry and tensile tests. It is demonstrated that GFECs fabricated using GF800 glass fiber show an improvement/enhancement of the mechanical properties with a fracture strain up to 500 MPa (around 20% higher than the nonreinforced epoxy composite counterpart). It is also shown that GFECs fabricated using GF3M glass fiber exhibited a reduction of the roughness up to 56%, which corresponds with a roughness improvement from N8 to N7 following the guidelines provided by the ISO 1302. These results suggest that this type of nanocomposites would be suitable to be used in the aeronautics and automotive industries.

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“…In the last decade, the growing interest of the developers of new materials has been turned to graphene-ceramic hybrids in particular, based on zirconia, in whose structure the graphene particles or its derivatives (reduced oxidized graphene or oxidized graphene) are incorporated, since they have unique physicochemical properties [ 1 ]. The spectrum of technologies (incomplete) interested in such a row of materials includes: dual technologies, the development of small-sized electronic devices, photonics, the creation of miniature energy sources and batteries, the production of medical preparations for the vector delivery of drugs in the body and early diagnosis of diseases (at the cellular level), the development of implants and antimicrobial reagents, the creation of nanostructured (photo)catalysts for petrochemical processes and environmental protection, and in the many other industries [ 2 , 3 , 4 , 5 , 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Graphene Sheets on Compaction and Sintering Properties of Nano-Zirconia Ceramics

et al. 2022

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The use of a nanostructured graphene-zirconia composite will allow the development of new materials with improved performance properties and a high functionality. This work covers a stepwise study related to the creation of a nanostructured composite based on ZrO2 and graphene. A composite was prepared using two suspensions: nano-zirconia obtained by sol-gel synthesis and oxygen-free graphene obtained sonochemically. The morphology of oxygen-free graphene sheets, phase composition and the morphology of a zirconia powder, and the morphology of the synthesized composite were studied. The effect of the graphene sheets on the rheological and sintering properties of a nanostructured zirconia-based composite powder has been studied. It has been found that graphene sheets in a hybrid nanostructure make it difficult to press at the elastic deformation stage, and the composite passes into the plastic region at a lower pressure than a single nano-zirconia. A sintering mechanism was proposed for a composite with a graphene content of 0.635 wt%, in which graphene is an important factor affecting the process mechanism. It has been determined that the activation energy of the composite sintering is more than two times higher than for a single nano-zirconia. Apparently, due to the van der Waals interaction, the graphene sheets partially stabilize the zirconia and prevent the disordering of the surface monolayers of its nanocrystals and premelting prior to the sintering. This leads to an increase in the activation energy of the composite sintering, and its sintering occurs, according to a mixed mechanism, in which the grain boundary diffusion predominates, in contrast to the single nano-zirconia sintering, which occurs through a viscous flow.

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Mechanical properties of ceramics reinforced with allotropic forms of carbon

Cited by 28 publications

References 488 publications

Amorphous Sugar Materials as Sustainable and Scalable Alternatives for Rigid, Short-Term-Use Products

Amorphous Sugar Materials as Sustainable and Scalable Alternatives for Rigid, Short-Term-Use Products

Improving glass‐fiber epoxy composites via interlayer toughening with polyacrylonitrile/multiwalled carbon nanotubes electrospun fibers

Influence of Graphene Sheets on Compaction and Sintering Properties of Nano-Zirconia Ceramics

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