Polyelectrolyte Stars and Cylindrical Brushes

Xu, Youyong; Plamper, Felix A.; Ballauff, Matthias; Müller, Axel H. E.

doi:10.1007/12_2009_24

Cited by 14 publications

(9 citation statements)

References 155 publications

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“…66 The unusual architecture of CPBs gives them some unique properties such as large dimensions of macromolecules, a low entanglement extent, and a lower critical micelle concentration (CMC). 67 It has been shown that CPBs with poly(L-lysine) side chains and sodium dodecylsulfate (SDS) can form complexes with intriguing structures.…”

Section: Assembly Of Cylindrical Polyelectrolyte Brushesmentioning

confidence: 99%

Architecture, Assembly, and Emerging Applications of Branched Functional Polyelectrolytes and Poly(ionic liquid)s

Ledin

Shevchenko

et al. 2015

ACS Appl. Mater. Interfaces

130

101

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Branched polyelectrolytes with cylindrical brush, dendritic, hyperbranched, grafted, and star architectures bearing ionizable functional groups possess complex and unique assembly behavior in solution at surfaces and interfaces as compared to their linear counterparts. This review summarizes the recent developments in the introduction of various architectures and understanding of the assembly behavior of branched polyelectrolytes with a focus on functional polyelectrolytes and poly(ionic liquid)s with responsive properties. The branched polyelectrolytes and poly(ionic liquid)s interact electrostatically with small molecules, linear polyelectrolytes, or other branched polyelectrolytes to form assemblies of hybrid nanoparticles, multilayer thin films, responsive microcapsules, and ion-conductive membranes. The branched structures lead to unconventional assemblies and complex hierarchical structures with responsive properties as summarized in this review. Finally, we discuss prospectives for emerging applications of branched polyelectrolytes and poly(ionic liquid)s for energy harvesting and storage, controlled delivery, chemical microreactors, adaptive surfaces, and ion-exchange membranes.

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Section: Assembly Of Cylindrical Polyelectrolyte Brushesmentioning

confidence: 99%

Architecture, Assembly, and Emerging Applications of Branched Functional Polyelectrolytes and Poly(ionic liquid)s

Ledin

Shevchenko

et al. 2015

ACS Appl. Mater. Interfaces

130

101

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“…Well-defined star-shaped poly(acrylic acid) ((PAA N ) X , with N and X indicating the number-average degree of polymerization and the number of arms, respectively) with N = 90 and X = 5 ((PAA 90 ) 5 , M n = 36 900 g mol À1 , Ð = 1.04) and N = 100 and X = 21 ((PAA 100 ) 21 , M n = 161 500 g mol À1 , Ð = 1.02) as well as linear PAA with M n = 36 000 g mol À1 (N = 500, Ð = 1.1) was synthesized and characterized as described elsewhere. 18,20 Low-molecularweight compounds CuSO 4 Á5H 2 O and ethanol (all of the analytical grade) as well as NaOH (0.1 M standard titre solution) were used as received. Distilled water was used as the solvent.…”

Section: Methodsmentioning

confidence: 99%

“…Obviously, star-shaped polyelectrolytes (also referred to as polyelectrolyte stars) [18][19][20] can be used as nanosized containers for the incorporation of metal ions and further as scaffolds in the preparation of metallo-containing NPs with tunable sizes and preferably with controlled size distribution. To the best of our knowledge, however, there are only a few reports on the reduction of metal ions in such systems.…”

Section: Introductionmentioning

confidence: 99%

Efficient size control of copper nanoparticles generated in irradiated aqueous solutions of star-shaped polyelectrolyte containers

Zezin

Feldman

Абрамчук

et al. 2015

Phys. Chem. Chem. Phys.

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The formation of copper nanoparticles (Cu-NPs) in irradiated aqueous solutions of star-shaped poly(acrylic acid) (PAA) were studied at two pH values. Transmission electron microscopy (TEM) demonstrates that the star-shaped macromolecules loaded with Cu(2+) ions can act as individual nanosized containers providing a perfect control over the size and size distribution of Cu-NPs. Electron paramagnetic resonance (EPR) and optical spectroscopy show a transformation of mechanisms controlling the reduction of Cu(2+) ions and the further formation of Cu-NPs. At pH 2.9, Cu-NPs are formed from the aquacomplexes of Cu(2+) ions through homogeneous nucleation. At pH 4.3, the formation of Cu-NPs occurs inside macromolecular containers loaded with Cu(2+) ions, which are bound to carboxylic groups of the polyelectrolyte. In the latter case, Cu-NPs apparently ripen from preformed hydrated Cu2O seeds, which are thought to result from the ultrasmall (Cu(2+))m(OH(-))k(COO(-))n species, thus implying a heterogeneous nucleation.

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“…These are essentially molecular brushes, because chains are grafted from a backbone rather like the comb geometry, although significantly more densely. 170,171 They have structural similarities to articular biopolymers such as lubricin 172 or aggrecan, 173,174 which have impressive lubrication and load-bearing properties. Bottlebrushes are not easy to graft from a surface and experiments are currently dominated by polymers grafted to the surface.…”

Section: Bottlebrushesmentioning

confidence: 99%