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Conductive cryogels have gained significant research interest in recent years due to their potential biomedical applications such as implantable and wearable devices, biosensors, medical patches, health recording electrodes, drug delivery systems, bioactuators, etc. In this study, poly(2-hydroxyethy methacrylate)/polypyrrole (PHEMA/PPy) cryogel possessing macroporous morphology, conductivity, cytocompatibility, and mechanical compression properties were produced by cryopolymerization in the presence of excess ammonium persulfate. Electrical properties of the PHEMA and PHEMA/PPy cryogels as a function of frequency were compared using electrical impedance spectroscopy. At low frequencies, the real part of the dielectric constant of the PHEMA was found to be about 4-fold higher than that of the PHEMA/PPy whereas the average imaginary dielectric constant of PHEMA/PPy cryogels was observed to be nearly 6-fold higher than that of the PHEMA cryogels at the same frequency region. This behavior suggests that the addition of polypyrrole to the PHEMA cryogel increases the conductivity of the resultant material. This claim is further supported by comparing the results of the loss tangent, impedance and AC conductivity variations as a function of frequency for all samples. According to cytotoxicity, morphological, and AO/EB staining studies. PHEMA/PPy cryogel did not cause any toxic effect on L929 cells, except for PHEMA/PPy4 extract. These data suggested that the PHEMA/PPy cryogel with conductivity and cytocompatibility is a promising candidate in biotechnology and biomedical engineering. © 2023 Elsevier Ltd

In the present study, the enantiomeric forms of hydrophobic amino acids ( l -tryptophan, l -tyrosine, and l -phenylalanine) were separated by molecularly imprinted capillary columns (MICC) via Capillary Electrochromatography (CEC) for the first time. The monomer ratio, crosslinker ratio, template molecule ratio, the porogen ratio and type, polymerization time, and also the effect of temperature were examined to increase the permeability properties of MICC. FTIR, SEM and BET analyses were realized for the characterization of MICC. The effect of the electric field, organic solvent ratio, and pressure were carried out experimentally to determine the optimum conditions. The separation performances of MICC and the non-imprinted capillary columns (NICC) were compared electrochromatographically.

Cryogels are an outstanding class of materials with special and functionalized physical properties in various fields and privileges for different industrial applications. Due to unique properties of quantum dots, properties of cryogels can be engineered by adding quantum dots in. In this study, both p(HEMA)-based cryogel and CdSe QDs synthesized and characterized, separately. Then, CdSe QDs were loaded into p(HEMA) cryogels by immersing cryogel into QDs solutions. FTIR-ATR, SEM and TGA characterizations were performed to ensure that CdSe QDs penetrate p(HEMA) cryogels effectively. Dielectric properties of CdSe QDs-loaded cryogel were investigated using Electrical Impedance Spectroscopy (EIS). Real and imaginary parts of dielectric constants were decreased significantly at low frequencies in QD-loaded cryogels. While real part of impedance was increased in CdSe QDs-loaded cryogel at low frequencies. In addition, at high frequencies, those parameters were observed to be same in both cases. Duzce University Scientific Research Project (DUBAP)Duzce University [2017.06.03.592] Authors kindly would like to thank Duzce University Scientific Research Project (DUBAP) Coordination for the support with the project number of 2017.06.03.592. WOS:000562679400007 2-s2.0-85087508329