Structural investigation of hybrid nanocomposites

Celso, Fabrizio Lo; Triolo, Alessandro; Negroni, Fabio; Hainbuchner, M.; Baron, M.; Strunz, Pavel; Rauch, Hunter A.; Triolo, R.

doi:10.1007/s003390201704

Cited by 7 publications

(36 citation statements)

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“…The dispersible unit (or agglomerate level 1) is the smallest structural unit in the rubber matrix which is composed of the aggregates and further forms a higher order structure defined as the mass-fractal structure (or agglomerate level 2). In this sense, the dispersible unit is equivalent to the "lower cutoff object" for the mass-fractal structure formed Natural logarithm of SAXS intensity I(q) vs q 2 for CB/ SBR (20). in the rubbers.…”

Section: Iii-1 Remarks On Terminologiesmentioning

confidence: 99%

“…In order to overcome these difficulties discussed above, the approach that we are focusing on is small-angle scattering (SAS) techniques which can provide us morphological features over several orders in length scales (∼nm to ∼μm) under various environments. So far, ultra-small-angle scattering (USAS) and conventional small-angle scattering (SAS) techniques using various radiations, such as X-ray, − neutron, ,,, and light, , have been utilized to explore the hierarchical structures of CB or silica (Si) fillers reinforced rubbers. However, the hierarchical structures of these fillers highly loaded in rubbers have not yet been studied systematically and extensively by using these various scattering methods in concert, albeit elucidation and manipulation of the morphology could be a key for controlling macroscopic properties of rubber-reinforced compounds.…”

Section: Introductionmentioning

confidence: 99%

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New Insight into Hierarchical Structures of Carbon Black Dispersed in Polymer Matrices: A Combined Small-Angle Scattering Study

et al. 2007

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Using a combined ultra-small-angle and small-angle scattering (CSAS) method of neutrons and X-rays, we investigated hierarchical structures of carbon black (CB) highly loaded in polyisoprene (PI) and poly-(styrene-random-butadiene) copolymer (SBR) under mechanical field (defined respectively as CB/PI and CB/ SBR) as well as in toluene under a sonic field (defined as CB/toluene). In order to analyze each structure level comprising the hierarchical structures of CB from the CSAS profiles, we employed the unified Guinier/powerlaw approach proposed by Beaucage (J. Appl. Cryst. 1995, 28, 717). Furthermore, in order to extract not only sizes but also shapes of the structure elements, we developed a modified approach, in which the Guinier scattering function utilized in the Beaucage approach was replaced by a form factor of the corresponding structure. Comparison of the scattering profiles from CB/PI and CB/SBR with CB/toluene clarified that (i) the smallest structure elements of CB (that further form mass-fractal objects) in PI and SBR were not an unbreakable unit of the CB filler which resulted after sonification in toluene but were instead composed of the several unbreakable units bounded together by polymer chains (defined as "dispersible units") and (ii) sizes and shapes of the dispersible units depended on the polymer matrix: Its size was larger in PI than in SBR. (iii) Moreover, the enlarged size of the dispersible unit in PI was found to enlarge the upper cutoff length of the mass-fractal structure in PI, while the mass-fractal dimensions themselves remained unchanged between PI and SBR. Hence, the detailed characterizations of the hierarchical structures by using CSAS shed new light on the dispersion process of the filler compound in the polymer matrix.

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Section: Iii-1 Remarks On Terminologiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

New Insight into Hierarchical Structures of Carbon Black Dispersed in Polymer Matrices: A Combined Small-Angle Scattering Study

et al. 2007

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“…Electrostatic self- or coassembly , between charged nanocolloids and/or polymers to generate functional materials and surfaces has recently aroused much interest, essentially because of their potential applications in various fields, such as material science − and biology. − However, compared to the abundant work on the mechanisms, structure characterizations and functionalities, not much attention has been paid to the formulation process. Indeed, in strongly associating polymeric systems, it often takes a very long time to reach true equilibrium.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Formulation Process in Electrostatic Assembly of Nanoparticles and Macromolecules in Aqueous Solution: The Mixing Pathway

Fresnais

Berret

et al. 2010

J. Phys. Chem. C

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8 pagesInternational audienceThe influence of formulation process/pathway on the generation of electrostatically coassembled complexes made from polyelectrolyte-neutral copolymers and oppositely charged nanocolloids is investigated in this work. Under strong driving forces like electrostatic interaction and/or hydrogen bonding, the key factor controlling the polydispersity and the final size of the complexes is the competition between the reaction time of the components and the homogenization time of the mixed solution. The former depends on the initial concentration of the individual stock solutions and the nature of the interaction and will be investigated in a forthcoming publication; the latter depends on the mixing pathway and is put under scrutiny here on a system composed of cerium oxide nanoparticles and charged-neutral diblock copolymers (CeO2/PSS7K-b- PAM30K) by tuning the mixing order and/or speed. The resulting structures generated from various formulation processes were characterized by light and neutron scattering techniques. The complexes final morphologies (size, shape, polydispersity) were found to depend strongly on the formulation process, while keeping at a smaller scale (clusters) the same nanostructure. Finally, the impact of those different structures on some bulk (rheology) and surface (wetting/antifouling) properties was evaluated. These results highlighted that a process dependent formulation seen a priori as a drawback can be turned into an advantage: different properties can be developed from different morphologies while keeping the chemistry constant

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Section: Introductionmentioning

confidence: 99%

“…Combining the advantageous properties of both the organic and inorganic worlds offers a great promise for engineering versatile functional structures with controlled physical and chemical attributes at the nanometer scale. This synergy will certainly trigger the emergence of a wide range of novel materials and processing techniques in various scientific and technological fields such as material science [4][5][6][7][8] and biology. [9][10][11][12][13] Compared to the abundant work on the mechanisms, structure characterizations, and functionalities, however, not much attention has been paid to the formulation process, which is a key issue for generating functional systems or devices on a large scale.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Formulation Process in Electrostatic Assembly of Nanoparticles and Macromolecules in Aqueous Solution: The Interaction Pathway

Fresnais

Berret

et al. 2010

J. Phys. Chem. C

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International audienceThe influence of the formulation process/pathway on the generation of electrostatic complexes made from polyelectrolyte-neutral copolymers and oppositely charged nanocolloids is investigated in this work. Under strong driving forces like electrostatic interaction and/or hydrogen bonding, the key factor controlling the polydispersity and the final size of the complexes is the competition between the reaction time of the components and the homogenization time of the mixed solution. The latter depends on the mixing pathway and was investigated in a previous publication by tuning the mixing order and/or speed (Qi, L.; Fresnais, J.; Berret, J.-F.; Castaing, J.-C.; Grillo, I.; Chapel, J.-P. J. Phys. Chem. C 2010, 114 (30), 12870−12877). The former depends on the initial concentration of the individual stock solutions and the strength of the interaction and is investigated here on a system composed of anionic cerium oxide functional nanoparticles (CeO2-PAA) and cationic charged−neutral diblock copolymers (PTEA11K-b-PAM30K) or homopolyelectrolytes (PDADMAC100K). The electrostatic interaction was screened off completely by adding a large amount of salts. Desalting kinetics was then controlled by slowly decreasing the ionic strength from Ib ≈ 0.5 M, the minimum ionic strength to totally prevent the complexation of the two components, to lower values where the electrostatically screened system undergoes an (abrupt) transition between an unassociated and a clustered state. Neutron scattering data evidenced differences in the nanostructure of complexes formed by either dilution or simple mixing. Furthermore, adsorption optical reflectometry experiments showed the impact of these different formulation processes on the wettability and antifouling properties of treated silica and polystyrene model surfaces. Better controlled mixing processes were put forward at the end to improve the productivity and reproducibility of the complexes generation. In particular, a microfluidic chip coupled with dynamic light scattering was used to better control the hydrodynamics of the complexation process

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Structural investigation of hybrid nanocomposites

Cited by 7 publications

References 0 publications

New Insight into Hierarchical Structures of Carbon Black Dispersed in Polymer Matrices: A Combined Small-Angle Scattering Study

New Insight into Hierarchical Structures of Carbon Black Dispersed in Polymer Matrices: A Combined Small-Angle Scattering Study

Influence of the Formulation Process in Electrostatic Assembly of Nanoparticles and Macromolecules in Aqueous Solution: The Mixing Pathway

Influence of the Formulation Process in Electrostatic Assembly of Nanoparticles and Macromolecules in Aqueous Solution: The Interaction Pathway

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