Electrochemical sensor and biosensor platforms based on advanced nanomaterials for biological and biomedical applications.

Conducting Polymers for Tissue Engineering

Isoelectric points and points of zero charge of metal (hydr)oxides: 50years after Parks' review.

An electrorheological fluid, a special type of suspension with controllable fluidity by an electric field, generally contains semiconducting or polarizable materials as electro-responsive parts. These materials align in the direction of the applied electric field to generate a solid-like phase in the suspension. These electro-responsive smart materials, including dielectric inorganics, semiconducting polymers and their hybrids, and polymer/inorganic composites, are reviewed in terms of their mechanism, rheological analysis and dielectric characteristics.

Electrorheological fluids: smart soft matter and characteristics

N-doped porous carbons with exceptionally high CO2 selectivity for CO2 capture

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Recent advances in bioactive 1D and 2D carbon nanomaterials for biomedical applications

Investigation of electrokinetic and electrorheological properties of polyindole prepared in the presence of a surfactant

In this study, polyindole (PIN) and polyindole/polyethylene (PIN/PE) conducting composites, having various amounts of PIN, were synthesized by chemical polymerization using FeCl 3 as an oxidizing agent and taking the ratio of salt:monomer as 3:1. The samples of PIN and PIN/PE composites were characterized by FTIR, UV–vis, TGA, SEM, Gouy scale magnetic susceptibility, conductivity (1.2 × 10 −3 S cm −1  >  σ  > 1.96 × 10 −6  S cm −1 , at T  = 25 °C) and density measurements. FTIR analysis suggested a 2,3-propagation mechanism for PIN formation. The ground milled samples were subjected to particle size analysis by dynamic light scattering (DLS) and a micron-sized particle distribution was obtained. A series of volume fractions ( ϕ  = 10–25%) were prepared from the materials in silicone oil (SO) and their sedimentation stabilities determined. The most stable composite [PIN(89%)/PE(11%)] against gravitational sedimentation was subjected to flow-rate measurements under externally applied electric field strength ( E ) and an electrorheological (ER) activity was observed; threshold energies ( E t ) were calculated. The effects of volume fraction, shear rate, external E , frequency and temperature onto ER activities of the suspensions were investigated. Enhancement in the electric field viscosities and shear thinning viscoelastic behaviors were observed for all the samples studied. Recoverable viscoelastic deformations were determined from the creep tests under external E .

Synthesis, electrorheology and creep behavior of polyindole/polyethylene composites

Peripheral nerve injuries cause devastating problems for the quality of patients' lives, and regeneration following damage to the peripheral nervous system is limited depending on the degree of the damage. Use of nanobiomaterials can provide therapeutic approaches for the treatment of peripheral nerve injuries. Electroactive biomaterials, in particular, can provide a promising cure for the regeneration of nerve defects. Here, a supramolecular electroactive nanosystem with tetra(aniline) (TA)-containing peptide nanofibers was developed and utilized for nerve regeneration. Self-assembled TA-conjugated peptide nanofibers demonstrated electroactive behavior. The electroactive self-assembled peptide nanofibers formed a well-defined three-dimensional nanofiber network mimicking the extracellular matrix of the neuronal cells. Neurite outgrowth was improved on the electroactive TA nanofiber gels. The neural differentiation of PC-12 cells was more advanced on electroactive peptide nanofiber gels, and these biomaterials are promising for further use in therapeutic neural regeneration applications.

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Biocompatible Electroactive Tetra(aniline)-Conjugated Peptide Nanofibers for Neural Differentiation

In this study, first polyindole (PIN) was synthesized using FeCl3 as an oxidizing agent. Then, an organomontmorillonite (O-MMT) was prepared from virgin montmorillonite (MMT) by cetyltrimethylammonium bromide (CTAB) quaternary ammonium salt. Further, PIN/O-MMT conducting nanocomposite was prepared with 18% O-MMT content. The samples of PIN, MMT, O-MMT, and PIN/O-MMT nanocomposite were characterized by FTIR spectroscopy, thermogravimetric analysis (TGA), X-ray diffraction (XRD), elemental analysis, conductivity, magnetic susceptibility, density, particle size measurements, and scanning electron microscopy (SEM) method. Characterization results showed a successfully prepared PIN/O-MMT nanocomposite having both intercalated and exfoliated structures. A series of concentrations (5–25%, m/m) were prepared from those above-mentioned materials in silicone oil (SO) and their sedimentation stabilities were determined. The suspensions were subjected to an external electric field strength and electrorheological (ER) activity was observed. The effects of dispersed particle concentration, shear rate, external electric field strength, frequency, and temperature onto ER activities of these suspensions were investigated. Creep tests were applied to all the four suspensions and recoverable viscoelastic deformations observed. POLYM. COMPOS., 31:471–481, 2010. a 2009 Society of Plastics Engineers

Ozlem Erol

Papers

Recent advances in bioactive 1D and 2D carbon nanomaterials for biomedical applications

Investigation of electrokinetic and electrorheological properties of polyindole prepared in the presence of a surfactant

Synthesis, electrorheology and creep behavior of polyindole/polyethylene composites

Biocompatible Electroactive Tetra(aniline)-Conjugated Peptide Nanofibers for Neural Differentiation

Synthesis, electrorheology, and creep behaviors of in situ intercalated polyindole/organo‐montmorillonite conducting nanocomposite