6 research outputs found
Reglas generales para el empleo de los signos de puntuación
Mención de responsabilidad tomada de la cubiert
Strong and Tough Layered Nanocomposites with Buried Interfaces
In nacre, the excellent mechanical
properties of materials are
highly dependent on their intricate hierarchical structures. However,
strengthening and toughening effects induced by the buried inorganic–organic
interfaces actually originate from various minerals/ions with small
amounts, and have not drawn enough attention yet. Herein, we present
a typical class of artificial nacres, fabricated by graphene oxide
(GO) nanosheets, carboxymethylcellulose (CMC) polymer, and multivalent
cationic (M<sup><i>n</i>+</sup>) ions, in which the M<sup><i>n</i>+</sup> ions cross-linking with plenty of oxygen-containing
groups serve as the reinforcing “evocator”, working
together with other cooperative interactions (<i>e.g.</i>, hydrogen (H)-bonding) to strengthen the GO/CMC interfaces. When
compared with the pristine GO/CMC paper, the cross-linking strategies
dramatically reinforce the mechanical properties of our artificial
nacres. This special reinforcing effect opens a promising route to
strengthen and toughen materials to be applied in aerospace, tissue
engineering, and wearable electronic devices, which also has implication
for better understanding of the role of these minerals/ions in natural
materials for the mechanical improvement
Bioinspired Interfacial Chelating-like Reinforcement Strategy toward Mechanically Enhanced Lamellar Materials
Many biological organisms
usually derived from the ordered assembly
of heterogeneous, hierarchical inorganic/organic constituents exhibit
outstanding mechanical integration, but have proven to be difficult
to produce the combination of excellent mechanical properties, such
as strength, toughness, and light weight, by merely mimicking their
component and structural characteristics. Herein, inspired by biologically
strong chelating interactions of phytic acid (PA) or IP6 in many biomaterials,
we present a biologically interfacial chelating-like reinforcement
(BICR) strategy for fabrication of a highly dense ordered “brick-and-mortar”
microstructure by incorporating tiny amounts of a natural chelating
agent (<i>e</i>.<i>g</i>., PA) into the interface
or the interlamination of a material (<i>e</i>.<i>g</i>., graphene oxide (GO)), which shows joint improvement in hardness
(∼41.0%), strength (∼124.1%), maximum Young’s
modulus (∼134.7%), and toughness (∼118.5%) in the natural
environment. Besides, for different composite matrix systems and artificial
chelating agents, the BICR strategy has been proven successful for
greatly enhancing their mechanical properties, which is superior to
many previous reinforcing approaches. This point can be mainly attributed
to the stronger noncovalent cross-linking interactions such as dense
hydrogen bonds between the richer phosphate (hydroxyl) groups on its
cyclohexanehexol ring and active sites of GO, giving rise to the larger
energy dissipation at its hybrid interfaces. It is also simple and
environmentally friendly for further scale-up fabrication and can
be readily extended to other material systems, which opens an advanced
reinforcement route to construct structural materials with high mechanical
performance in an efficient way for practical applications
A General Bioinspired, Metals-Based Synergic Cross-Linking Strategy toward Mechanically Enhanced Materials
Creating
lightweight engineering materials combining high strength
and great toughness remains a significant challenge. Despite possessing-enhanced
strength and stiffness, bioinspired/polymeric materials usually suffer
from clearly reduced extensibility and toughness when compared to
corresponding bulk polymer materials. Herein, inspired by tiny amounts
of various inorganic impurities for mechanical improvement in natural
materials, we present a versatile and effective metal ion (M<sup><i>n</i>+</sup>)-based synergic cross-linking (MSC) strategy incorporating
eight types of metal ions into material bulks that can drastically
enhance the tensile strength (∼24.1–70.8%), toughness
(∼18.6–110.1%), modulus (∼21.6–66.7%),
and hardness (∼6.4–176.5%) of multiple types of pristine
materials (from hydrophilic to hydrophobic and from unary to binary).
More importantly, we also explore the primarily elastic–plastic
deformation mechanism and brittle fracture behavior (indentation strain
of >5%) of the synergic cross-linked graphene oxide (Syn-GO) paper
by means of <i>in situ</i> nanoindentation SEM. The MSC
strategy for mechanically enhanced integration can be readily attributed
to the formation of the complicated metals-based cross-linking/complex
networks in the interfaces and intermolecules between functional groups
of materials and various metal ions that give rise to efficient energy
dissipation. This work suggests a promising MSC strategy for designing
advanced materials with outstanding mechanical properties by adding
low amounts (<1.0 wt %) of synergic metal ions serving as synergic
ion-bonding cross-linkers
Bioinspired Interfacial Chelating-like Reinforcement Strategy toward Mechanically Enhanced Lamellar Materials
Many biological organisms
usually derived from the ordered assembly
of heterogeneous, hierarchical inorganic/organic constituents exhibit
outstanding mechanical integration, but have proven to be difficult
to produce the combination of excellent mechanical properties, such
as strength, toughness, and light weight, by merely mimicking their
component and structural characteristics. Herein, inspired by biologically
strong chelating interactions of phytic acid (PA) or IP6 in many biomaterials,
we present a biologically interfacial chelating-like reinforcement
(BICR) strategy for fabrication of a highly dense ordered “brick-and-mortar”
microstructure by incorporating tiny amounts of a natural chelating
agent (<i>e</i>.<i>g</i>., PA) into the interface
or the interlamination of a material (<i>e</i>.<i>g</i>., graphene oxide (GO)), which shows joint improvement in hardness
(∼41.0%), strength (∼124.1%), maximum Young’s
modulus (∼134.7%), and toughness (∼118.5%) in the natural
environment. Besides, for different composite matrix systems and artificial
chelating agents, the BICR strategy has been proven successful for
greatly enhancing their mechanical properties, which is superior to
many previous reinforcing approaches. This point can be mainly attributed
to the stronger noncovalent cross-linking interactions such as dense
hydrogen bonds between the richer phosphate (hydroxyl) groups on its
cyclohexanehexol ring and active sites of GO, giving rise to the larger
energy dissipation at its hybrid interfaces. It is also simple and
environmentally friendly for further scale-up fabrication and can
be readily extended to other material systems, which opens an advanced
reinforcement route to construct structural materials with high mechanical
performance in an efficient way for practical applications
Bioinspired Interfacial Chelating-like Reinforcement Strategy toward Mechanically Enhanced Lamellar Materials
Many biological organisms
usually derived from the ordered assembly
of heterogeneous, hierarchical inorganic/organic constituents exhibit
outstanding mechanical integration, but have proven to be difficult
to produce the combination of excellent mechanical properties, such
as strength, toughness, and light weight, by merely mimicking their
component and structural characteristics. Herein, inspired by biologically
strong chelating interactions of phytic acid (PA) or IP6 in many biomaterials,
we present a biologically interfacial chelating-like reinforcement
(BICR) strategy for fabrication of a highly dense ordered “brick-and-mortar”
microstructure by incorporating tiny amounts of a natural chelating
agent (<i>e</i>.<i>g</i>., PA) into the interface
or the interlamination of a material (<i>e</i>.<i>g</i>., graphene oxide (GO)), which shows joint improvement in hardness
(∼41.0%), strength (∼124.1%), maximum Young’s
modulus (∼134.7%), and toughness (∼118.5%) in the natural
environment. Besides, for different composite matrix systems and artificial
chelating agents, the BICR strategy has been proven successful for
greatly enhancing their mechanical properties, which is superior to
many previous reinforcing approaches. This point can be mainly attributed
to the stronger noncovalent cross-linking interactions such as dense
hydrogen bonds between the richer phosphate (hydroxyl) groups on its
cyclohexanehexol ring and active sites of GO, giving rise to the larger
energy dissipation at its hybrid interfaces. It is also simple and
environmentally friendly for further scale-up fabrication and can
be readily extended to other material systems, which opens an advanced
reinforcement route to construct structural materials with high mechanical
performance in an efficient way for practical applications