Mesoporous polymeric catalysts synthesized from self-assembled organic nanotubes as templates

Nguyen, Thi‐Thanh‐Tam; Simon, François‐Xavier; Khelfallah, Nawel S.; Schmutz, Marc; Mésini, Philippe J.

doi:10.1039/c000534g

Cited by 8 publications

(12 citation statements)

References 30 publications

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“…The nanocomposites with nanoparticles are denoted as npCOP (np = nanoparticle), and the composites with nanowires are named as nwCOP (nw = nanowire) for convenience. The uniform structure of Co 3 O 4 nanoparticles is believed to result from the caging effect of COPs with organized pore structure 29 . For npCOP, the average diameter of the particles is 10.82 ± 1.88 nm; for nwCOP, the length of the particles is 38.36 ± 12.7 nm and the width is 3.036 ± 0.816 nm.…”

Section: Morphology and Chemical Composition Of Co 3 O 4 -Cop Compositesmentioning

confidence: 99%

“…The uniform structure of Co 3 O 4 nanoparticles is believed to result from the caging effect of COPs with an organized pore structure. 29 In order to verify the templation by COPs, Co 3 O 4 nanoparticles were synthesized within several amide-based porous polymers instead of utilizing COPs. The structures with 2,3,5,6-tetramethyl-1,4-phenylenediamine (COP-58, Fig.…”

Section: Morphology and Chemical Composition Of Co 3 O 4 -Cop Compositesmentioning

confidence: 99%

“…The uniform structures of nanoparticles indicate that COPs have a unique and organized pore structure unlike other amorphous porous carbons. 29 The control in the morphology of nanoparticles is, therefore, achieved by different solvent systems (Scheme 1). This may be attributed to the different wetting properties of COPs in different solvents.…”

Section: Morphology and Chemical Composition Of Co 3 O 4 -Cop Compositesmentioning

confidence: 99%

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Nanoporous networks as caging supports for uniform, surfactant-free Co₃O₄ nanocrystals and their applications in energy storage and conversion

et al. 2015

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We report a new, surfactant-free method to produce Co3O4 nanocrystals with controlled sizes and high dispersity by a caging templation of nanoporous networks. The morphologies of Co3O4 nanoparticles differ from wires to particulates by simply varying solvents. The composites of nanoparticles within network polymers are highly porous and show promise in many applications where accessible surface and aggregation prevention is important. The electrochemical performance of the composites demonstrates superior capacity and cyclic stability at a high current density (~980 mAh g -1 at 60 th cycle at current density of 1000 mA g -1 ). In a catalytic oxidation reaction of carbon monoxide, the composites exhibit a remarkable stability (in excess of 35 hours) and catalytic performance (T100 = 100 o C).

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Section: Morphology and Chemical Composition Of Co 3 O 4 -Cop Compositesmentioning

confidence: 99%

Section: Morphology and Chemical Composition Of Co 3 O 4 -Cop Compositesmentioning

confidence: 99%

Section: Morphology and Chemical Composition Of Co 3 O 4 -Cop Compositesmentioning

confidence: 99%

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Nanoporous networks as caging supports for uniform, surfactant-free Co₃O₄ nanocrystals and their applications in energy storage and conversion

et al. 2015

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“…Knowledge of mesophase transitions is essential to tailoring desired mesoscopic structures for applications, such as lightactivated release mechanism for drug delivery, 19 catalysis, 20,21 photovoltaics, 22 and nanowire production, 23 as well as being important on a fundamental level to understanding the energetic process of lipid molecular deformations. This process is also relevant to membrane fusion and cellular entrance by nanoparticles (NPs).…”

Section: Introductionmentioning

confidence: 99%

Hydrophilic nanoparticles stabilising mesophase curvature at low concentration but disrupting mesophase order at higher concentrations

et al. 2016

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Using high pressure small angle X-ray scattering (HP-SAXS), we have studied monoolein (MO) mesophases at 18 wt% hydration in the presence of 10 nm silica nanoparticles (NPs) at NP-lipid number ratios (ν) of 1 × 10(-6), 1 × 10(-5) and 1 × 10(-4) over the pressure range 1-2700 bar and temperature range 20-60 °C. In the absence of the silica NPs, the pressure-temperature (p-T) phase diagram of monoolein exhibited inverse bicontinuous cubic gyroid (Q), lamellar alpha (Lα), and lamellar crystalline (Lc) phases. The addition of the NPs significantly altered the p-T phase diagram, changing the pressure (p) and the temperature (T) at which the transitions between these mesophases occurred. In particular, a strong NP concentration effect on the mesophase behaviour was observed. At low NP concentration, the p-T region pervaded by the Q phase and the Lα-Q mixture increased, and we attribute this behaviour to the NPs forming clusters at the mesophase domain boundaries, encouraging transition to the mesophase with a higher curvature. At high NP concentrations, the Q phase was no longer observed in the p-T phase diagram. Instead, it was dominated by the lamellar (L) phases until the transition to a fluid isotropic (FI) phase at 60 °C at low pressure. We speculate that NPs formed aggregates with a "chain of pearls" structure at the mesophase domain boundaries, hindering transitions to the mesophases with higher curvatures. These observations were supported by small angle neutron scattering (SANS) and scanning electron microscopy (SEM). Our results have implications to nanocomposite materials and nanoparticle cellular entry where the interactions between NPs and organised lipid structures are an important consideration.

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“…This approach has 2 the additional advantage of an easier processability, because the pore formation and the chemical crosslinking steps are decoupled. The template can either remain in the final membrane (if the template presents an intrinsic porosity) [17][18][19][20][21][22][23], or it can be removed by dissolution or chemical degradation [24][25][26]. In the field of ultramicroporous materials (pore width < 1 nm), only the former approach is feasible, and therefore, most systems reported consist of microchannels or nanotubes formed by assembly of macrocyclic compounds, where the macrocycle ensures the control of the pore width.…”

Section: Introductionmentioning

confidence: 99%

Microporous polyacrylate matrix containing hydrogen bonded nanotubular assemblies

Ouhib¹,

Bugnet²,

Nossov³

et al. 2010

Polymer

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37-3 FIELD Section Title:Plastics Manufacture and Processing UMR 7610, Chimie des Polymeres, UPMC Univ Paris 06, Paris, Fr. FIELD URL: written in EnglishWe report the straightforward photo-polymn. of polyacrylate films contg. bis-urea based self-assembled nanotubes. The obtained materials are characterized by gas adsorption measurements, 129Xe NMR spectroscopy and WAXS. The presence of the bis-ureas is shown by butane adsorption (at 273 K and ambient pressure) to be responsible for the formation of a significant microporosity. This porosity is however not detected by the classical argon adsorption procedure (at 77 K and low pressure). This effect is attributed to the contraction of the material at low temp. and pressure, and may be of general concern for other org. porous materials. One of the potential advantages of the present materials is that the porosity results from the self-assembled nanotubes and should therefore be independent of the matrix mech. properties. It should in particular be possible to adjust the flexibility of the matrix by changing the monomer compn. [on SciFinder(R)

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Mesoporous polymeric catalysts synthesized from self-assembled organic nanotubes as templates

Cited by 8 publications

References 30 publications

Nanoporous networks as caging supports for uniform, surfactant-free Co₃O₄ nanocrystals and their applications in energy storage and conversion

Nanoporous networks as caging supports for uniform, surfactant-free Co₃O₄ nanocrystals and their applications in energy storage and conversion

Hydrophilic nanoparticles stabilising mesophase curvature at low concentration but disrupting mesophase order at higher concentrations

Microporous polyacrylate matrix containing hydrogen bonded nanotubular assemblies

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Mesoporous polymeric catalysts synthesized from self-assembled organic nanotubes as templates

Cited by 8 publications

References 30 publications

Nanoporous networks as caging supports for uniform, surfactant-free Co3O4 nanocrystals and their applications in energy storage and conversion

Nanoporous networks as caging supports for uniform, surfactant-free Co3O4 nanocrystals and their applications in energy storage and conversion

Hydrophilic nanoparticles stabilising mesophase curvature at low concentration but disrupting mesophase order at higher concentrations

Microporous polyacrylate matrix containing hydrogen bonded nanotubular assemblies

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Product

Resources

About

Nanoporous networks as caging supports for uniform, surfactant-free Co₃O₄ nanocrystals and their applications in energy storage and conversion

Nanoporous networks as caging supports for uniform, surfactant-free Co₃O₄ nanocrystals and their applications in energy storage and conversion