Mr. Maciej J. Glowacki Profile

Maciej J. Glowacki

PhD Student at Gdansk Univ of Technology

SPIE Involvement:

Author

Area of Expertise:

Nanodiamonds , Color Centers , Fluorescence , Dynamic Light Scattering , Electrophoretic Light Scattering

Maciej Jerzy Glowacki studies Automation, Electronics, Electrical Engineering and Space Technologies at the Doctoral School of the Gdansk University of Technology, Poland, where he carries out research on optoelectronic sensory microsystems utilizing color centers in nanodiamonds. He specializes in production and optical characterization of fluorescent nanodiamond suspensions, as well as in particle analysis by dynamic light scattering (DLS) and electrophoretic light scattering (ELS).

Proceedings Article | 18 April 2021 Presentation

Effect of pH on optical sensing with poly-L-lysine-modified nanodiamonds

Maciej Glowacki, Monika Janik, Mirosław Sawczak, Anna Wcislo, Pawel Niedzialkowski, Mateusz Ficek, Robert Bogdanowicz

Proceedings Volume 11772, 117720D (2021) https://doi.org/10.1117/12.2589306

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Nitrogen-vacancy (NV) centers are crystallographic defects which provide diamonds with unique physical properties. The centers are known for their intensive, time-stable fluorescence, and an electron spin, which exhibits long coherence time and may be manipulated using external stimuli. Nanodiamonds containing the NV centers are promising tools in biolabeling, biosensing, and drug delivery due to the aforementioned properties of the defects combined with a chemical inertness of a core and an easily functionalized surface of the diamond. Many biochemical reactions are pH-sensitive, therefore, in order to utilize the NV centers for monitoring of such processes, the pH-dependency of the properties of the nanodiamonds needs to be well-understood. Functionalization of the nanodiamonds’ surfaces with biological molecules undergoing pH-triggered changes of conformation, e.g. poly-L-lysine, could not only increase the particles’ biocompatibility and promote cell adhesion, but also possibly enhance pH-sensitivity. In the present study, an impact of pH on the fluorescence, a zeta potential, and a contact angle of the NV centers-containing nanodiamonds dispersed in liquid media is examined. The suspensions were made of commercially available, fluorescent diamond particles in an as-received, unmodified state, and after the poly-L-lysine had been attached to their surfaces via two different procedures – in aqueous, and anhydrous environment. Values of pH of dispersion media were specifically chosen to induce diverse conformation of the poly-L-lysine: from a fully relaxed conformation, through a state of being neither wholly extended, nor helical, to a complete α-helix conformation. The intensity of the photoluminescence emitted by the NV centers has been found to depend on the pH-triggered conformation of the poly-L-lysine attached to the surfaces of the nanodiamonds. The impact of the conformation of the poly-L-lysine on the electric charge of the nanoparticles has also been analyzed. This study confirms the potential of the nitrogen-vacancy centers for optical sensing of pH-triggered processes.

Proceedings Article | 1 September 2017 Paper

Preparation of fluorescent nanodiamond suspensions using bead-assisted ultrasonic disintegration

Maciej Głowacki, Mateusz Gardas, Mateusz Ficek, Mirosław Sawczak, Robert Bogdanowicz

Proceedings Volume 10455, 104550E (2017) https://doi.org/10.1117/12.2281681

KEYWORDS: Ultrasonics, Luminescence, Color centers

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Proceedings Article | 17 February 2017 Paper

Gold nanoparticles evaluation using functional optical coherence tomography

Marcin Strąkowski, Maciej Głowacki, Aleksandra Kamińska, Mirosław Sawczak

Proceedings Volume 10053, 1005336 (2017) https://doi.org/10.1117/12.2254912

KEYWORDS: Nanoparticles, Gold, Optical coherence tomography, Tissue optics, Polarization, Spectroscopy, Medical diagnostics, Scattering, Particles, Statistical analysis

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Proceedings Article | 2 March 2015 Paper

Nano-particle doped hydroxyapatite material evaluation using spectroscopic polarization sensitive optical coherence tomography

Paulina Strąkowska, Michał Trojanowski, Mateusz Gardas, Maciej Głowacki, Maciej Kraszewski, Marcin Strąkowski

Proceedings Volume 9312, 93122X (2015) https://doi.org/10.1117/12.2080281

KEYWORDS: Optical coherence tomography, Nanoparticles, Silver, Spectroscopy, Sol-gels, Polarization, Analytical research, Nanocomposites, Particles, Optical spectroscopy

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