This page lists most of our publications starting from 2014.

Total: ca. 150 Publications

Please refer to Google Scholar for a complete list.

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Cellulose Nanofibril Nanopapers and Bioinspired Nanocomposites: A Review to Understand the Mechanica

Read the full paper here: J. Mater. Chem. A DOI: 10.1039/C7TA02006F (2017) Cellulose nanofibrils (CNFs) emerge as a renewable and sustainable feedstock for future biobased high-performance materials with environmentally friendly character. They allow for the formation of pure nanopapers or can be integrated into bioinspired nanocomposites leading to excellent multifunctional properties. CNFs feature outstanding intrinsic mechanical properties due to their high crystallinity (high specific stiffness and strength), attractive nanoscale dimensions, and high surface areas suitable for chemical functionalization. The focus of this review is to discuss the current state of the art and understandin

Temporal control of i-motif switch lifetimes for autonomous operation of transient DNA nanostructure

Get the full article here: Chem. Sci. 2017, DOI: 10.1039/C7SC00646B Functional DNA nanotechnology creates increasingly complex behaviors useful for sensing, actuation or computation, as enabled via the integration of dynamic and responsive structural DNA motifs. However, temporally controlled and dynamic DNA structures with programmable lifetimes, that are able to operate autonomously and self-revert to the starting state are challenging to achieve due to tedious and very system-specific sequence design. Here, we present a straightforward concept to program transient lifetimes into DNA duplexes based on the pH-sensitive DNA i-motif switch. We integrate the i-motif switch with an internal, no

Nanocellulose Aerogels for Supporting Iron Catalysts and In Situ Formation of Polyethylene Nanocompo

Read the full paper here: Advanced Functional Materials, DOI DOI: 10.1002/adfm.201605586, 2017 Aerogels of nanocellulose (NC) prepared by freeze-drying of cellulose nanofibrils (CNF) hydrogels and followed by impregnation with methylaluminoxane serve as nanoporous organic supports for immobilizing single site iron catalysts such as bisiminopyridine iron(II) complexes. The resulting catalyst systems, exploiting renewable biomaterials as organic supports, are highly active in low pressure ethylene polymerization. They afford simultaneous control of high density polyethylene (HDPE) particle morphology and facile NC dispersion within the HDPE matrix. In the early stage of ethylene polymerization

Counterion Size and Nature Control Structural and Mechanical Response in Cellulose Nanofibril Nanopa

Read the full paper here: Biomacromolecules, 2017, DOI: 10.1021/acs.biomac.7b00263 Nanopapers formed from aqueous dispersions of cellulose nanofibrils (CNFs) combine stiffness, strength, and toughness. Yet, delicate interactions operate between the CNFs during nanopaper formation and mechanical deformation. We unravel in detail how counterions, being either of the organic alkyl ammonium kind (NR4+) or of the earth metal series (Li+, Na+, Cs+), need to be chosen to achieve outstanding combinations of stiffness, strength, and toughness, extending to previously unreached territories. We relate structure formation processes in terms of colloidal stabilization to nanostructural details such as po

Switchable Supracolloidal Coassembly of Microgels Mediated by Host/Guest Interactions

Read the full paper here: ACS Macro Lett., 2017, 6, 310 Supramolecular engineering of multibody colloidal systems provides flexible ways of manipulating superstructures and material properties. We investigate a coassembling microgel (MG) system, in which host- and guest-modified MG partners coassemble by molecular recognition, and show in detail how electrostatic repulsion needs to be balanced for the supramolecular recognition to take place. We observe a gradual change from repellent MGs to stable clusters and ordered flocculates upon decreasing electrostatic repulsion. The adaptive nature of the multivalent interactions embedded in the soft MG shell leads to kinetically trapped scenarios a

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