Bioinspired Interfacial Chelating-like Reinforcement Strategy toward Mechanically Enhanced Lamellar Materials

ACS Nano ◽  
2018 ◽  
Vol 12 (5) ◽  
pp. 4269-4279 ◽  
Author(s):  
Ke Chen ◽  
Shuhao Zhang ◽  
Anran Li ◽  
Xuke Tang ◽  
Lidong Li ◽  
...  
Keyword(s):  
Lamellar Materials

Intercalation of n-alkylamines by lamellar materials of the α-zirconium phosphate type

1990 ◽  
Vol 25 (12) ◽  
pp. 1531-1539 ◽  
Author(s):  
Fe Menéndez ◽  
Aránzazu Espina ◽  
Camino Trobajo ◽  
Julio Rodríguez
Keyword(s):  
Zirconium Phosphate ◽  
Lamellar Materials

The Chemistry of Extended Oxide Surfaces

2016 ◽  
Author(s):  
Bruce C. Bunker ◽  
William H. Casey
Keyword(s):  
Equilibrium Constants ◽  
Surface Structures ◽  
Fracture Plane ◽  
Oxide Surfaces ◽  
Oxide Surface ◽  
Local Structures ◽  
Fracture Event ◽  
Starting Point ◽  
Lamellar Materials ◽  
Octahedral Cations

In Chapters 4 and 5, we demonstrated that local structures and charge distributions have an enormous impact on the equilibrium constants, trajectories, and kinetics of reactions involving soluble oxide precursors. In this chapter, we highlight those features that make reactions on extended oxide surfaces either similar to or dramatically different from the reactions documented in hydrolysis diagrams for each metal cation (see Chapter 5). We first describe oxide surface structures and then discuss how these structures impact both acid–base and ligand-exchange phenomena. In addition to dense oxides, we also introduce some of the chemistry associated with layered materials. Lamellar materials are important from both a fundamental and technological perspective, because water and ions can readily penetrate such structures and provide conditions under which almost every oxygen anion is at an oxide–water interface (see Chapter 10 and Chapter 11). This chapter focuses on oxides containing octahedral cations. The distinctive chemistry of oxides based on tetrahedral cations, including the clay minerals and the zeolites, are the focus of Part Five. The structures of bulk oxides were introduced in Chapter 2. However, for many oxides, the surface structures that interact with aqueous solutions are substantially different from structures found in the bulk. Here, we introduce the basic principles of oxide surfaces that make them chemically active. As a starting point, consider ideal oxide surfaces containing +2 octahedral cations. Pristine oxide surfaces can be created by cleaving perfect crystals in an ultrahigh-vacuum environment. The creation of new surfaces requires an expenditure of energy corresponding to the cohesive energy of the solid, which in turn represents the energy required to break every bond along a given fracture plane. For MgO, the Mg−O bond energy is 380 kJ/mole. Each surface created contains 1.4.1019 oxygen atoms/m2, or 2.4.10−5 moles of bonds. Because two surfaces are created in the fracture event, the initial interfacial energy of each resulting MgO surface is (1/2)(380 kJ/mole)/(2.4_10−5 mole/m2 )=4560 mJ/m2.

Synthesis of new lamellar materials by self-assembly and coordination chemistry in the solids

2008 ◽  
Vol 46 (3) ◽  
pp. 383-392 ◽  
Author(s):  
Johan Alauzun ◽  
Ahmad Mehdi ◽  
Rola Mouawia ◽  
Catherine Reyé ◽  
Robert J. P. Corriu
Keyword(s):  
Coordination Chemistry ◽  
Self Assembly ◽  
Lamellar Materials

scholarly journals Effect of Different Surface-charged Lamellar Materials on Swelling Properties of Nanocomposite Hydrogels

2021 ◽  
Author(s):  
Marcela Pfeifer ◽  
Flávio A. C. Andrade ◽  
Ricardo Bortoletto-Santos ◽  
Fauze A. Aouada ◽  
Caue Ribeiro
Keyword(s):  
Water Absorption ◽  
Anomalous Behavior ◽  
Absorption Capacity ◽  
Water Absorption Capacity ◽  
Swelling Properties ◽  
Ph Variation ◽  
Nanocomposite Hydrogels ◽  
Thermally Activated ◽  
Different Temperatures ◽  
Lamellar Materials

Abstract This study investigated the effect of different surface-charged lamellar materials on the swelling and diffusion properties of synthesized polyacrylamide-methylcellulose hydrogels (HG). Montmorillonite and hydrotalcite thermally activated at two different temperatures (300 and 550 ºC) were incorporated in the preparation of nanocomposite (NC) hydrogels. A series of NC hydrogels were prepared by varying the lamellar material content (1:1, 2:1 and 4:1). The results showed that the HG with hydrotalcite (550 ºC) was strongly dependent on the ionic intensity, and that the swelling degree increased by 50%, 65% and 78% with reducing the hydrotalcite content at (1:1), (2:1) and (4:1), respectively. The water absorption capacity of HG containing montmorillonite or hydrotalcite (300 ºC) was slightly affected when the pH decreased from 7 to 3. However, the pH variation from 7 to 10 increased the water absorption capacity of most HG, except those containing hydrotalcite (550 ºC) at (2:1) and (4:1). The presence of lamellar nanoparticles in hydrogels made the polymer matrix more rigid, and less likely to absorb water. In contrast, HG with hydrotalcite (550 ºC) at (2:1) and (4:1) showed anomalous behavior with an increase in their water absorption capacity. The results support that the developed NC-HG can be suitable candidates for applications as controlled released materials.

Incorporation of Rare-Earth Complexes in α-Zirconium Phosphate Layered Matrices via Pendant Amino Groups

2002 ◽  
Vol 726 ◽  
Author(s):  
Shanez Tlemsani ◽  
Anne-Christine Franville ◽  
Daniel Zambon ◽  
Rachid Mahiou
Keyword(s):  
Rare Earth ◽  
Zirconium Phosphate ◽  
Blue Shift ◽  
Inorganic Materials ◽  
Rare Earth Complexes ◽  
Oh Groups ◽  
Organic Complexes ◽  
Before And After ◽  
Interlayer Region ◽  
Lamellar Materials

AbstractAmino-substituted rare-earth complexes (p-LnNH2DBM and m-LnNH2DBM with Ln3+ = Eu3+, Y3+) are intercalated in the interlayer region of a α-zirconium phosphate lattice to give luminescent hybrid lamellar materials. The preparation of the organic precursors and of the derived organic-inorganic materials is reported. XRD studies show that the hybrid compounds retain a layered structure and FTIR spectroscopy is used to monitor the intercalation reaction. The acid/base interactions between the NH2 functions and the pendant P-OH groups induce an important blue-shift of the absorption maximum of the organic molecule. The Eu3+ luminescence properties are investigated before and after intercalation of the organic complexes in the α-ZrP host structure and the optical characteristics of the para and meta derivatives are also compared.

Strong Biomimetic Hydroxyapatite Scaffolds

2006 ◽  
Vol 49 ◽  
pp. 148-152 ◽  
Author(s):  
Sylvain Deville ◽  
Eduardo Saiz ◽  
Ravi K. Nalla ◽  
Antoni P. Tomsia
Keyword(s):  
Porous Ceramic ◽  
Porous Scaffolds ◽  
Biomimetic Scaffolds ◽  
Lamellar Materials ◽  
Biomimetic Hydroxyapatite ◽  
Controlled Freezing ◽  
New Generation ◽  
Fundamental Limitation ◽  
Random Porosity ◽  
Better Than

Despite extensive efforts in the development of fabrication methods to prepare porous ceramic scaffolds for osseous tissue regeneration, all porous materials have a fundamental limitation- the inherent lack of strength associated with porosity. Shells (nacre), tooth and bone are frequently used as examples for how nature achieves strong and tough materials made out of weak components. So, the unresolved engineering dilemma is how to create a scaffold that is both porous and strong. The objective of this study was to mimic the architecture of natural materials in order to create a new generation of strong hydroxyapatite-based porous scaffolds. The porous inorganic scaffolds were fabricated by the controlled freezing of water-based hydroxyapatite (HA) slurries. The scaffolds obtained by this process have a lamellar architecture that exhibits similarities with the meso- and micro- structure of the inorganic component of nacre. Compressive strengths of 20 MPa were measured for lamellar scaffolds with densities of 32%, significantly better than for the HA with random porosity. In addition, the lamellar materials exhibit gradual fracture unlike conventional porous HA scaffolds. These biomimetic scaffolds could be the basis for a new generation of porous and composite biomaterials.

Toward a probe-based method for determining exfoliation energies of lamellar materials

2012 ◽  
Author(s):  
Zhao Deng ◽  
Alex Smolyanitsky ◽  
Qunyang Li ◽  
Xi-Qiao Feng ◽  
Rachel J. Cannara
Keyword(s):  
Lamellar Materials

scholarly journals Diazene-Functionalized Lamellar Materials as Nanobuilding Blocks: Application as Light-Sensitive Fillers to Initiate Radical Photopolymerizations

2017 ◽  
Vol 6 (2) ◽  
pp. 117-120 ◽  
Author(s):  
Cyrielle Dol ◽  
François Vibert ◽  
Michèle P. Bertrand ◽  
Jacques Lalevée ◽  
Stéphane Gastaldi ◽  
...  
Keyword(s):  
Nanobuilding Blocks ◽  
Lamellar Materials
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