The yield of stem cell collection after mobilization is crucial for autologous peripheral blood stem cell (PBSC) transplantation. Quantitative determinations of CD34 + cells using flow cytometry or stem cell culture have been used, but these methods require much time, technical experience, and expensive reagents.
Conducting core-shell poly(styrene/pyrrole) (poly(St/Py)) particles were successfully prepared by a one-step solution route in soap-free emulsion polymerization. Hydrogen peroxide (H 2 O 2 ) and a trace of ferric chloride (FeCl 3 ) were used as an initiator couple to carry out Fe 3+ -catalyzed oxidative polymerization. The average particle size of the particle was approximately 250 nm and its core-shell morphology (shell thickness ∼20-30 nm) was proved with transmission electron microscopy. The SEM images after CHCl 3 dissolution supported a clear evidence of distinct core-shell morphology, and which was confirmed by DSC and TGA analyses. We proposed a growth mechanism for the formation of the core-shell poly(St/Py) particles based on the time-evolution morphology of the particle. The result was also corroborated by the time-evolution GPC, FT-IR and ζ-potential data. The surface compositions of the particles were examined by X-ray photoelectron spectroscopy (XPS). The doped particles showed a high conductivity in the dry state.
Poly(thiophene) (PTh) nanoparticles with various sizes were directly prepared by Fe3+-catalyzed oxidative polymerization of thiophene with varying hydrogen peroxide (H2O2) concentrations. In the polymerization, the FeCl3/H2O2 (catalyst/oxidant) combination system was used as an initiator couple. Under the optimized reaction condition, percentage monomer conversions were >90%. With increasing H2O2 molar concentration from 2.35 to 5.88 M, the average sizes of the PTh nanoparticles decreased from 51 to 12 nm, and their photoemission wavelengths shifted from red to blue color at the maximum excitation wavelength (λUV
max = 400 nm). However, the molecular weights of all PTh nanoparticles were ∼3500 g/mol. As a result, we could tune the emitting colors that resulted from variations of the effective conjugation chain length by manipulating the size of PTh nanoparticles.
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