TY  - JOUR
A1  - Zimmermann, Marc
A1  - Grigoriev, Dmitry
A1  - Puretskiy, Nikolay
A1  - Böker, Alexander
T1  - Characteristics of microcontact printing with polyelectrolyte ink for the precise preparation of patches on silica particles
JF  - RSC Advances
N2  - This publication demonstrates the abilities of a precise and straightforward microcontact printing approach for the preparation of patchy silica particles. In a broad particle size range, it is possible to finely tune the number and parameters of three-dimensional patches like diameter and thickness using only polyethyleneimine ink, poly(dimethoxysilane) as stamp material and a suitable release solvent.
Y1  - 2018
U6  - https://doi.org/10.1039/c8ra07955b
SN  - 2046-2069
VL  - 8
IS  - 69
SP  - 39241
EP  - 39247
PB  - Royal Society of Chemistry
CY  - Cambridge
ER  - 
TY  - JOUR
A1  - Zimmermann, Marc
A1  - John, Daniela
A1  - Grigoriev, Dmitry
A1  - Puretskiy, Nikolay
A1  - Böker, Alexander
T1  - From 2D to 3D patches on multifunctional particles
BT  - how microcontact printing creates a new dimension of functionality
JF  - Soft matter
N2  - A straightforward approach for the precise multifunctional surface modification of particles with three-dimensional patches using microcontact printing is presented. By comparison to previous works it was possible to not only control the diameter, but also to finely tune the thickness of the deposited layer, opening up the way for three-dimensional structures and orthogonal multifunctionality. The use of PEI as polymeric ink, PDMS stamps for microcontact printing on silica particles and the influence of different solvents during particle release on the creation of functional particles with three-dimensional patches are described. Finally, by introducing fluorescent properties by incorporation of quantum dots into patches and by particle self-assembly via avidin-biotin coupling, the versatility of this novel modification method is demonstrated.
Y1  - 2018
U6  - https://doi.org/10.1039/c8sm00163d
SN  - 1744-683X
SN  - 1744-6848
VL  - 14
IS  - 12
SP  - 2301
EP  - 2309
PB  - Royal Society of Chemistry
CY  - Cambridge
ER  - 
TY  - JOUR
A1  - Mehr, Fatemeh Naderi
A1  - Grigoriev, Dmitry
A1  - Puretskiy, Nikolay
A1  - Böker, Alexander
T1  - Mono-patchy zwitterionic microcolloids as building blocks for pH-controlled self-assembly
JF  - Soft matter
N2  - A directional molecular interaction between microcolloids can be achieved through pre-defined sites on their surface, patches, which might make them follow each other in a controlled way and assemble into target structures of more complexity. In this article, we report the successful generation and characterization of mono-patchy melamine-formaldehyde microparticles with oppositely charged patches made of poly(methyl vinyl ether-alt-maleic acid) or polyethyleneimine via microcontact printing. The study of their self-aggregation behavior in solution shows that by change of pH, particle dimers are formed via attractive electrostatic force between the patchy and non-patchy surface of the particles, which reaches its optimum at a specific pH.
Y1  - 2019
U6  - https://doi.org/10.1039/c8sm02151a
SN  - 1744-683X
SN  - 1744-6848
VL  - 15
IS  - 11
SP  - 2430
EP  - 2438
PB  - Royal Society of Chemistry
CY  - Cambridge
ER  - 
TY  - JOUR
A1  - Mehr, Fatemeh Naderi
A1  - Grigoriev, Dmitry
A1  - Heaton, Rebecca
A1  - Baptiste, Joshua
A1  - Stace, Anthony J.
A1  - Puretskiy, Nikolay
A1  - Besley, Elena
A1  - Böker, Alexander
T1  - Self-assembly behavior of oppositely charged inverse bipatchy microcolloids
JF  - Small : nano micro
N2  - A directed attractive interaction between predefined "patchy" sites on the surfaces of anisotropic microcolloids can provide them with the ability to self-assemble in a controlled manner to build target structures of increased complexity. An important step toward the controlled formation of a desired superstructure is to identify reversible electrostatic interactions between patches which allow them to align with one another. The formation of bipatchy particles with two oppositely charged patches fabricated using sandwich microcontact printing is reported. These particles spontaneously self-aggregate in solution, where a diversity of short and long chains of bipatchy particles with different shapes, such as branched, bent, and linear, are formed. Calculations show that chain formation is driven by a combination of attractive electrostatic interactions between oppositely charged patches and the charge-induced polarization of interacting particles.
KW  - electrostatic interactions
KW  - patchy particles
KW  - polyelectrolyte inks
KW  - sandwich microcontact printing
KW  - self-assembly
Y1  - 2020
U6  - https://doi.org/10.1002/smll.202000442
SN  - 1613-6810
SN  - 1613-6829
VL  - 16
IS  - 14
PB  - Wiley-VCH
CY  - Weinheim
ER  -