Browsing by Author "Kalachikova, Polina M."

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  • Albumin Stabilized Fe@C Core–Shell Nanoparticles as Candidates for Magnetic Hyperthermia Therapy
    (2022-08) Ramírez-Morales, Maria Antonieta; Goldt, Anastasia E.; Kalachikova, Polina M.; Ramirez B, Javier A.; Suzuki, Masashi; Zhigach, Alexey N.; Ben Salah, Asma; Shurygina, Liliya I.; Shandakov, Sergey D.; Zatsepin, Timofei; Krasnikov, Dmitry V.; Maekawa, Toru; Nikolaev, Evgeny N.; Nasibulin, Albert G.
     A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    Carbon-encapsulated iron nanoparticles (Fe@C) with a mean diameter of 15 nm have been synthesized using evaporation–condensation flow–levitation method by the direct iron-carbon gas-phase reaction at high temperatures. Further, Fe@C were stabilized with bovine serum albumin (BSA) coating, and their electromagnetic properties were evaluated to test their performance in magnetic hyperthermia therapy (MHT) through a specific absorption rate (SAR). Heat generation was observed at different Fe@C concentrations (1, 2.5, and 5 mg/mL) when applied 331 kHz and 60 kA/m of an alternating magnetic field, resulting in SAR values of 437.64, 129.36, and 50.4 W/g for each concentration, respectively. Having such high SAR values at low concentrations, obtained material is ideal for use in MHT.
  • Direct injection of SWCNTs into liquid after supercritical nitrogen treatment
    (2019-11-01) Kalachikova, Polina M.; Goldt, Anastasia E.; Khabushev, Eldar M.; Eremin, Timofei V.; Ustinovich, Konstantin B.; Grebenko, Artem; Parenago, Olga O.; Zatsepin, Timofei S.; Pokrovskiy, Oleg I.; Obraztsova, Elena D.; Nasibulin, Albert G.
     Letter
    We developed a novel robust technique to produce high-quality dispersions of debundled SWCNTs in aqueous solutions. Direct injection of SWCNTs treated with supercritical nitrogen into the aqueous surfactant solution facilitates the dispersion process without the need of extensive ultrasonication. According to photoluminescence and absorbance measurements, the mild ultrasonic treatment of such dispersions resulted in a higher yield of individual SWCNTs, compared to pristine tubes and tubes collected after the supercritical treatment in the form of powder.
  • Single-step extraction of small-diameter single-walled carbon nanotubes in the presence of riboflavin
    (2022-12-22) Kalachikova, Polina M.; Goldt, Anastasia E.; Khabushev, Eldar M.; Eremin, Timofei V.; Zatsepin, Timofei S.; Obraztsova, Elena D.; Larionov, Konstantin V.; Antipina, Liubov Yu; Sorokin, Pavel B.; Nasibulin, Albert G.
     A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    We propose a novel approach to disperse and extract small-diameter single-walled carbon nanotubes (SWCNTs) using an aqueous solution of riboflavin and Sephacryl gel. The extraction of small-diameter semiconducting SWCNTs was observed, regardless of the initial diameter distribution of the SWCNTs. Dispersion of SWCNTs occurs due to the adsorption of π-conjugated isoalloxazine moieties on the surface of small-diameter nanotubes and interactions between hydroxy groups of ribityl chains with water. During the SWCNT extraction, specific adsorption of riboflavin to SWCNTs leads to the minimization of interactions between the SWCNTs and gel media. Our experimental findings are supported by ab initio calculations demonstrating the impact of the riboflavin wrapping pattern around the SWCNTs on their interaction with the allyl dextran gel.