This study investigates the parametric quality and reliability of 3D-printed scaffolds using a composite filament comprising a thermoplastic polymer and hydroxyapatite in 1:1 wt ratio. Employing a fused filament fabrication printer, we verified the 3D printing strategy, sintering temperature range, and preparation of hydroxyapatite scaffolds. To complete the study, in vitro cytotoxicity tests using animal and human cell models were conducted. The calcium-deficient hydroxyapatite (Ca/P ∼ 1.54) used in preparation of filament exhibited after sintering differences in crystalochemical phases in different rations, comparing to stoichiometric hydroxyapatite (Ca/P ≅ 1.67). The FFF process successfully produced scaffold macropores suitable for tissue vascularization (∼380 µm or smaller). Optimal sintering temperature for cell proliferation was identified at 1300 °C, especially effective for used investigated calcium-deficient hydroxyapatite. Cytotoxicity assessment with murine and human fibroblastic cells demonstrated differing behaviour, emphasizing the need for careful material property modifications for practical scaffold utilization.

Marian Janek; Ida Vašková; Martina Pischová; Roman Fialka; Zora Hajdúchová; Peter Veteška; Jozef Feranc; Martina Horváth Orlovská; Peter Peciar; Erik Rakovský; Ľuboš Bača. Characteristics of sintered calcium deficient hydroxyapatite scaffolds produced by 3D printing. Journal of the European Ceramic Society 2024, 44, 5284 -5297.

Marian Janek, Ida Vašková, Martina Pischová, Roman Fialka, Zora Hajdúchová, Peter Veteška, Jozef Feranc, Martina Horváth Orlovská, Peter Peciar, Erik Rakovský, Ľuboš Bača. Characteristics of sintered calcium deficient hydroxyapatite scaffolds produced by 3D printing. Journal of the European Ceramic Society. 2024; 44 (9):5284-5297.

Marian Janek; Ida Vašková; Martina Pischová; Roman Fialka; Zora Hajdúchová; Peter Veteška; Jozef Feranc; Martina Horváth Orlovská; Peter Peciar; Erik Rakovský; Ľuboš Bača. 2024. "Characteristics of sintered calcium deficient hydroxyapatite scaffolds produced by 3D printing." Journal of the European Ceramic Society 44, no. 9: 5284-5297.

Stanislav Baratov; Elena Filonova; Anastasiya Ivanova; Muhammad Bilal Hanif; Muneeb Irshad; Muhammad Zubair Khan; Martin Motola; Sajid Rauf; Dmitry Medvedev. Current and further trajectories in designing functional materials for solid oxide electrochemical cells: A review of other reviews. Journal of Energy Chemistry 2024, 94, 302 -331.

Stanislav Baratov, Elena Filonova, Anastasiya Ivanova, Muhammad Bilal Hanif, Muneeb Irshad, Muhammad Zubair Khan, Martin Motola, Sajid Rauf, Dmitry Medvedev. Current and further trajectories in designing functional materials for solid oxide electrochemical cells: A review of other reviews. Journal of Energy Chemistry. 2024; 94 ():302-331.

Stanislav Baratov; Elena Filonova; Anastasiya Ivanova; Muhammad Bilal Hanif; Muneeb Irshad; Muhammad Zubair Khan; Martin Motola; Sajid Rauf; Dmitry Medvedev. 2024. "Current and further trajectories in designing functional materials for solid oxide electrochemical cells: A review of other reviews." Journal of Energy Chemistry 94, no. : 302-331.

The electronic structure, including the spin–orbit coupling effect of the HfH molecule, has been studied to determine if it can be cooled through Doppler and Sysphus laser cooling techniques. The multi-reference configuration interaction plus Davidson correction (MRCI + Q) method has been used to calculate its potential energy curves (P.E.C.s) in the Ω^(±) and ^2s+1Ʌ^(+/-) representation. The spectroscopic constants T_e, R_e, ω_e, B_e, α_e, the dipole moment µ_e, and the dissociation energies D_e agree very well with previously published work. In addition, we present in this work twenty new doublet and quartet states in the Ω^(±) representation. The electronic transition dipole moment curves (TDMCs) between the lowest-lying electronic states have been investigated for the Δ - Π, Π - ∑⁺ and Δ - Φ transitions among specific Ω^(±) states. The Franck-Condon factors (FCFs), the Einstein coefficient of spontaneous emission ${\mathrm{A}}_{{\mathrm{\nu }}^{\prime }\mathrm{\nu }}$, and the radiative lifetime τ have been computed for the investigated transitions. In addition, properties of the molecules' electronic and vibrational states, such as the static dipole moment curves (D.M.C.s), the ionic character f_ionic, and the rovibrational constants are calculated. We deduce from our results that the HfH molecule is indeed a laser-cooling candidate that can reach a temperature as low as the nK regime. We present a complementary scheme with suitable experimental parameters. These results can be of great interest to experimental spectroscopists interested in ultracold diatomic molecules and their applications.

Nariman Abu el Kher; Mahmoud Korek; Nissrin Alharzali; Nayla El-Kork. Electronic structure with spin-orbit coupling effect of HfH molecule for laser cooling investigations. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 2024, 314, 124106 .

Nariman Abu el Kher, Mahmoud Korek, Nissrin Alharzali, Nayla El-Kork. Electronic structure with spin-orbit coupling effect of HfH molecule for laser cooling investigations. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. 2024; 314 ():124106.

Nariman Abu el Kher; Mahmoud Korek; Nissrin Alharzali; Nayla El-Kork. 2024. "Electronic structure with spin-orbit coupling effect of HfH molecule for laser cooling investigations." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 314, no. : 124106.