Creating a synthetic platform for the encapsulation of nanocrystals with covalently bound polymer shells

Koll, Rieke; Fruhner, Lisa; Heller, Hauke; Allgaier, Jürgen; Pyckhout‐Hintzen, Wim; Kruteva, Margarita; Feoktystov, Artem; Biehl, Ralf; Förster, Stephan; Weller, Horst

doi:10.1039/c8nr10018g

Cited by 13 publications

(15 citation statements)

References 40 publications

(53 reference statements)

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“…[ 13 , 14 ] Surface compatibilization has recently been extended from linear to diblock copolymers, which opened a route to block copolymer nanocomposites, where the nanoparticles can be localized in the center of selected block copolymer domains. This has been demonstrated for polymer‐coated Au‐nanoparticles in thin films of bottle brush copolymers, [15] for block copolymer‐coated iron oxide nanoparticles in micellar monolayers,[ 16 , 17 , 18 ] as well as for CuS nanoplatelets in PS‐P4VP [19] and two‐dimensional assemblies. [20] …”

Section: Introductionmentioning

confidence: 92%

3D‐Positioning of Nanoparticles in High‐Curvature Block Copolymer Domains

et al. 2021

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The defined assembly of nanoparticles in polymer matrices is an important precondition for next-generation functional materials.Here we demonstrate that adefined threedimensional nanoparticle assembly within the unit cells can be realized by directly linking the nanoparticles to blockc opolymers.W es howt hat for ar ange of nearly symmetric to unsymmetric blockc opolymers there are only two formed structures,ahexagonal lattice of P6/mmm-symmetry,where the nanoparticles are located in 1D-arrays within the cylindrical domains,a nd ac ubic lattice of Im3m-symmetry,w here the nanoparticles are located in the octahedral voids of aB CClattice,c orresponding to the structure of ferrite steel. We observe the blocklength ratio and thus the interfacial curvature to be the most important parameter determining the lattice type. This is rationalized in terms of minimal chain extension such that domain topologies with large positive curvature are highly preferred. Already volume fractions of only one percent are sufficient to destabilize al amellar structure and favor the formation of highly curved interfaces.T he study thus demonstrates how nanoparticles can be located on well-defined positions in three-dimensional unit cells of blockc opolymer nanocomposites.T his opens the way to functional 3D-nanocomposites where the nanoparticles need to be located on defined matrix positions.

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Section: Introductionmentioning

confidence: 92%

3D‐Positioning of Nanoparticles in High‐Curvature Block Copolymer Domains

et al. 2021

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“…Previous articles [26][27][28] have proved that the structure factor S(q) is only obvious at the smaller q region for systems of concentrated spherical particles. For the dilute solution (1 wt%), the structure factor can be set as constant, i.e., S(q) = 1, suggesting that the scattering curves directly represent the form factors of the particles.…”

Section: Saxs Theorymentioning

confidence: 99%

“…For PAA brushes, the polyelectrolyte chains of SPB swell in aqueous dispersions with an increase in pH according to the Daoud-Cotton theory and the mean field theory [18,19], which proposes that there are interactions among concentrated SPBs and the charge degree of PAA chains. A number of characterization methods have been used to characterize the properties of SPBs, such as WAXS, [20] SAXS [21][22][23][24][25], scanning electron microscopy (SEM) [26,27], transmission electron micrography (TEM) [28,29], dynamic light scattering (DLS) [30] and small-angle neutron scattering (SANS) [31]. However, the interactions among concentrated SPB aqueous dispersions have not been carefully examined or investigated by researchers, and there is a scarcity of reports on this in the literature.…”

Section: Introductionmentioning

confidence: 99%

Effect of Counterions on the Interaction among Concentrated Spherical Polyelectrolyte Brushes

Wang

et al. 2021

Polymers

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The effect of counterions on interactions among spherical polyelectrolyte brushes (SPBs) was systematically investigated by rheology, small-angle X-ray scattering (SAXS) and wide-angle X-ray scattering (WAXS). The SPB particles consist of a solid polystyrene (PS) core with a diameter of ca.100 nm and a chemically grafted poly-(acrylic acid) (PAA) brush layer. Metal ions of different valences (Na+, Mg2+ and Al3+) were used as counterions to study the interactions among concentrated SPBs. The so-called “structure factor peak” in SAXS, the “local ordered structure peak” in WAXS and rheological properties indicated the interactions among concentrated SPBs. Combining SAXS, WAXS and rheology, the formation mechanism of the local ordered structure among PAA chains in the overlapped area of adjacent SPB, which was generated due to the bridge function of counterions, was confirmed. In contrast, excessive counterions shielded the electrostatic interaction among PAA chains and destroyed the local ordered structure. This work enriches our understanding of the polyelectrolyte assembly in concentrated SPBs under the effect of counterions and lays the foundations for SPB applications.

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“…133 For SANS, contrast variation by hydrogendeuterium isotope substitution enables to determine the particle morphology and in particular highlight the structure of the surfactant. 134,135 For example, Koll et al 130 studied the structure of superparamagnetic iron oxide MNPs encapsulated with a highly stable diblock copolymer shell by SANS and SAXS Fig. 2 Small-angle scattering setup in (a) transmission geometry with a position-sensitive detector placed downstream, which is protected by a beamstop (white area) at the center against the direct incoming beam (orange arrows).…”

Section: Structural Morphologymentioning

confidence: 99%