Tailoring the alignment of string-like nanoparticle assemblies in a functionalized polymer matrix via steady shear

Chen, Yulong; Liu, Jun; Liu, Li; Han, Huanre; Xu, Qian; Qian, Xin

doi:10.1039/c6ra28060a

Cited by 4 publications

(6 citation statements)

References 64 publications

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“…This _ γ value closely matches the shear rate during shearing treatment of the supramolecular composite (278 s −1 , calculated in the Supplementary Note 4), suggesting that PEI 600 in the PEI 600 -PS 60 composite undergoes whole chain relaxation 57 . These results imply that the PEI 600 in the PEI 600 -PS 60 composite failed to be stretched during shearing, and the corresponding energy was dissipated completely through the rapid relaxation of the polymer chains 23 (Fig. 2e(i)).…”

Section: Optimization Of Supramolecular Compositesmentioning

confidence: 94%

“…Shear-induced colloidal ordering in the supramolecular composites depends on the colloids' ability to acquire momentum during shearing 44 , which involves energy dissipation and transfer and is highly correlated with the composition of the supramolecular composite 23,54 . Therefore, careful optimization of the composite composition and clarification of the mechanism of shear-induced colloidal ordering is essential, which can provide crucial guidance for designing composite formulations for producing SCCFs with high-quality structural colors.…”

Section: Optimization Of Supramolecular Compositesmentioning

confidence: 99%

“…1a(iii). Since the shear-induced ordering effect of the colloids in the composite depends on the applied shear strain (γ) 37 , the shear strain rate ( _ γ) 23 , and the resulting shear stress and compressive stress 55 in the composite, the relevant processing parameters, including the thickness of the supramolecular composite (h Composite ), the diameter of the rod (D), and the load (G), were optimized individually while other parameters were held constant. The calculations of γ (Supplementary Note 3), _ γ(Supplementary Note 4), average compressive stress (Supplementary Note 5), shear stress (Supplementary Note 6), as well as the corresponding optimization results (Supplementary Figs.…”

Section: Optimization Of Supramolecular Compositesmentioning

confidence: 99%

“…Among the various functional nanomaterials, structurally colored composite films (SCCFs) composed of orderly arranged colloids embedded in the polymeric matrix have gained immense interest in scientific and industrial communities 11,12 . These SCCFs process both the structural color endowed by the orderly arrangement of colloids and the flexibility and functionality of polymers 1,8,11,13 , making them promising for applications in various fields, including displays [14][15][16] , anticounterfeiting 17,18 , colorful coatings 19,20 , visual sensing [21][22][23] , solar cells 24 , and optical fibers 25 .Generally, solvent evaporation-induced colloidal assembly is commonly used to produce SCCFs from colloids [26][27][28] . This assembly process is conducted in a liquid dispersion medium, where the ordered arrangement of colloids is driven by the dynamic balance between electrostatic repulsion, solvation forces, van der Waals forces, and capillary forces generated by the volatilization of the medium 19,[29][30][31] .…”

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confidence: 99%

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confidence: 99%

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Scalable production of structurally colored composite films by shearing supramolecular composites of polymers and colloids

Li,

Peng,

Lyu

et al. 2024

Nat Commun

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Structurally colored composite films, composed of orderly arranged colloids in polymeric matrix, are emerging flexible optical materials, but their production is bottlenecked by time-consuming procedures and limited material choices. Here, we present a mild approach to producing large-scale structurally colored composite films by shearing supramolecular composites composed of polymers and colloids with supramolecular interactions. Leveraging dynamic connection and dissociation of supramolecular interactions, shearing force stretches the polymer chains and drags colloids to migrate directionally within the polymeric matrix with reduced viscous resistance. We show that meter-scale structurally colored composite films with iridescence color can be produced within several minutes at room temperature. Significantly, the tunability and diversity of supramolecular interactions allow this shearing approach extendable to various commonly-used polymers. This study overcomes the traditional material limitations of manufacturing structurally colored composite films by shearing method and opens an avenue for mildly producing ordered composites with commonly-available materials via supramolecular strategies.

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Section: Optimization Of Supramolecular Compositesmentioning

confidence: 94%

Section: Optimization Of Supramolecular Compositesmentioning

confidence: 99%

Section: Optimization Of Supramolecular Compositesmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Scalable production of structurally colored composite films by shearing supramolecular composites of polymers and colloids

Li,

Peng,

Lyu

et al. 2024

Nat Commun

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Chain dynamics and nanoparticle motion in attractive polymer nanocomposites subjected to large deformations

et al. 2017

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The effect of large deformation on the chain dynamics in attractive polymer nanocomposites was investigated using neutron scattering techniques. Quasi-elastic neutron backscattering measurements reveal a substantial reduction of polymer mobility in the presence of attractive, well-dispersed nanoparticles. In addition, large deformations are observed to cause a further slowing down of the Rouse rates at high particle loadings, where the interparticle spacings are slightly smaller than the chain dimensions, i.e. in the strongly confined state. No noticeable change, however, was observed for a lightly confined system. The reptation tube diameter, measured by neutron spin echo, remained unchanged after shear, suggesting that the level of chain-chain entanglements is not significantly affected. The shear-induced changes in the interparticle bridging reflect the slow nanoparticle motion measured by X-ray photon correlation spectroscopy. These results provide a first step for understanding how large shear can significantly affect the segmental motion in nanocomposites and open up new opportunities for designing mechanically responsive soft materials.

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Shear-induced parallel and transverse alignments of cylinders in thin films of diblock copolymers

Chen

Jin

et al. 2018

Soft Matter

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Coarse-grained Langevin dynamics simulations were performed to investigate the alignment behavior of monolayer films of cylinder-forming diblock copolymers under steady shear, a structure of significant importance for many technical applications such as nanopatterning. The influences of shear conditions, the interactions involved in the films, and the initial morphology of the cylinder-forming phase were examined. Our results showed that above a critical shear rate, the cylinders can align either along the shearing direction or transverse (log-rolling) to the shearing direction depending on the relative strength between the interchain attraction in the cylinders (εAA) and the surface attraction of the confining walls with the film (εBW). To understand the underlying mechanism, the microscopic properties of the films under shear were systematically investigated. It was found that at low εAA/εBW, the majority blocks of the diblock polymer that are adsorbed on the confining walls prefer to move synchronously with the walls, inducing the cylinder-forming blocks to align along the flow direction. When εAA/εBW is above a threshold value, a strong attraction between the cylinder-forming blocks restrains their movement during shear, leading to the log-rolling motions of the cylinders. To predict the threshold εAA/εBW, we developed an approach based on equilibrium thermodynamics data and found good agreement with our shear simulations.

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Tailoring the alignment of string-like nanoparticle assemblies in a functionalized polymer matrix via steady shear

Abstract: This work reports the steady shear induced aligning behaviour of nanoparticle strings in a functionalized polymer matrix.

Cited by 4 publications

References 64 publications

Scalable production of structurally colored composite films by shearing supramolecular composites of polymers and colloids

Scalable production of structurally colored composite films by shearing supramolecular composites of polymers and colloids

Chain dynamics and nanoparticle motion in attractive polymer nanocomposites subjected to large deformations

Shear-induced parallel and transverse alignments of cylinders in thin films of diblock copolymers

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