TY  - JOUR
A1  - Couturier, Jean-Philippe
A1  - Wischerhoff, Erik
A1  - Bernin, Robert
A1  - Hettrich, Cornelia
A1  - Koetz, Joachim
A1  - Sutterlin, Martin
A1  - Tiersch, Brigitte
A1  - Laschewsky, Andre
T1  - Thermoresponsive Polymers and Inverse Opal Hydrogels for the Detection of Diols
JF  - Langmuir
N2  - Responsive inverse opal hydrogels functionalized by boroxole moieties were synthesized and explored as sensor platforms for various low molar mass as well as polymeric diols and polyols, including saccharides, glycopolymers and catechols, by exploiting the diol induced modulation of their structural color. The underlying thermoresponsive water-soluble copolymers and hydrogels exhibit a coil-to-globule or volume phase transition, respectively, of the LCST-type. They were prepared from oligoethylene oxide methacrylate (macro)monomers and functionalized via copolymerization to bear benzoboroxole moieties. The resulting copolymers represent weak polyacids, which can bind specifically to diols within an appropriate pH window. Due to the resulting modulation of the overall hydrophilicity of the systems and the consequent shift of their phase transition temperature, the usefulness of such systems for indicating the presence of catechols, saccharides, and glycopolymers was studied, exploiting the diol/polyol induced shifts of the soluble polymers’ cloud point, or the induced changes of the hydrogels’ swelling. In particular, the increased acidity of benzoboroxoles compared to standard phenylboronic acids allowed performing the studies in PBS buffer (phosphate buffered saline) at the physiologically relevant pH of 7.4. The inverse opals constructed of these thermo- and analyte-responsive hydrogels enabled following the binding of specific diols by the induced shift of the optical stop band. Their highly porous structure enabled the facile and specific optical detection of not only low molar mass but also of high molar mass diol/polyol analytes such as glycopolymers. Accordingly, such thermoresponsive inverse opal systems functionalized with recognition units represent attractive and promising platforms for the facile sensing of even rather big analytes by simple optical means, or even by the bare eye.
Y1  - 2016
U6  - https://doi.org/10.1021/acs.langmuir.6b00803
SN  - 0743-7463
VL  - 32
SP  - 4333
EP  - 4345
PB  - American Chemical Society
CY  - Washington
ER  - 
TY  - JOUR
A1  - Secker, Christian
A1  - Voelkel, Antje
A1  - Tiersch, Brigitte
A1  - Koetz, Joachim
A1  - Schlaad, Helmut
T1  - Thermo-Induced Aggregation and Crystallization of Block Copolypeptoids in Water
JF  - Macromolecules : a publication of the American Chemical Society
N2  - Block copolypeptoids comprising a thermosensitive, crystallizable poly(N-(n-propyl)glycine) block and a watersoluble poly(N-methylglycine) block, P70My (y = 23, 42, 76, 153, and 290), were synthesized bY ring-opening polymerization of the corresponding N-alkylglycine N-carboxyanhydrides (NCAs) and examined according to their thermo-induced aggregation and crystallization in water by turbidimetty, micro-differential scanning calorimetry (micro-DSC); cryogenic scanning electron microscopy (cryo-SEM), analytical ultracentrifugation (AUC), and static light scattering (SLS). At a temperature above the cloud point temperature, the initially formed micellar aggregates started to crystallize and grow into larger complex assemblies of about 100-500 nm, exhibiting flower-like (P70M23), ellipsoidal (P70M42 and P70M72) or irregular shapes (P70M153 and.P70M290).
Y1  - 2016
U6  - https://doi.org/10.1021/acs.macromol.5b02481
SN  - 0024-9297
SN  - 1520-5835
VL  - 49
SP  - 979
EP  - 985
PB  - American Chemical Society
CY  - Washington
ER  - 
TY  - JOUR
A1  - Vargas-Ruiz, Salome
A1  - Schulreich, Christoph
A1  - Kostevic, Angelika
A1  - Tiersch, Brigitte
A1  - Koetz, Joachim
A1  - Kakorin, Sergej
A1  - von Klitzing, Regine
A1  - Jung, Martin
A1  - Hellweg, Thomas
A1  - Wellert, Stefan
T1  - Extraction of model contaminants from solid surfaces by environmentally compatible microemulsions
JF  - Journal of colloid and interface science
N2  - In the present contribution, we evaluate the efficiency of eco-friendly microemulsions to decontaminate solid surfaces by monitoring the extraction of non-toxic simulants of sulfur mustard out of model surfaces. The extraction process of the non-toxic simulants has been monitored by means of spectroscopic and chromatographic techniques. The kinetics of the removal process was analyzed by different empirical models. Based on the analysis of the kinetics, we can assess the influence of the amounts of oil and water and the microemulsion structure on the extraction process. (C) 2016 Elsevier Inc. All rights reserved.
KW  - Microemulsions
KW  - Decontamination
KW  - Surface removal
KW  - Kinetic analysis
KW  - Extraction
Y1  - 2016
U6  - https://doi.org/10.1016/j.jcis.2016.03.006
SN  - 0021-9797
SN  - 1095-7103
VL  - 471
SP  - 118
EP  - 126
PB  - Elsevier
CY  - San Diego
ER  -