The production and characterization of pure and strontium-substituted BCP powders have been reported previously [9 (link),33 (link)]. The particle size range was from 1 to 100 µm (the mean particle size as determined by laser granulometry was around 30 µm, with significant polydispersity) [9 (link),33 (link)]. Briefly, the sol–gel route previously proposed by the authors was used. To produce 2 g of pure HAp powder, 4.7 g of Ca(NO3)2·4H2O (Aldrich) and 0.84 g of P2O5 (Avocado Research chemicals) were dissolved in ethanol under stirring and refluxed at 85 °C for 24 h. Then, this solution was kept at 55 °C for 24 h, to obtain a white consistent gel and was further heated at 80 °C for 10 h to obtain a white powder. Finally, the powder was heated at 1100 °C for 15 h. To prepare Sr-substituted hydroxyapatite, the required amount of Sr(NO3)2 (Aldrich) was added to the solution. In the presented work, particles were tested and found to be endotoxin-free using the E-toxate kit from Sigma-Aldrich (Saint-Quentin-Fallavier, Isère, France).
Sr no3 2
Manufactured by Merck Group
Sourced in Germany, United States
Sr(NO3)2 is a chemical compound that consists of strontium and nitrate ions. It is a white, crystalline solid that is commonly used in various laboratory applications. The core function of Sr(NO3)2 is to serve as a source of strontium ions in experimental and analytical procedures.
Automatically generated - may contain errors
Lab products found in correlation
Fe no3 3 9h2o, by Merck Group (5 mentions)
Ca no3 2 4h2o, by Merck Group (3 mentions)
Co no3 2 6h2o, by Merck Group (2 mentions)
Cu no3 2 3h2o, by Merck Group (2 mentions)
La no3 3 6h2o, by Merck Group (2 mentions)
La no3 3 6h2o, by Thermo Fisher Scientific (2 mentions)
Ba no3 2, by Merck Group (2 mentions)
Zn no3 2 6h2o, by Merck Group (2 mentions)
Ni no3 2 6h2o, by Merck Group (2 mentions)
Ca no3 2 4h2o, by Thermo Fisher Scientific (2 mentions)
Al no3 3 9h2o, by Thermo Fisher Scientific (2 mentions)
Mn no3 2 4h2o, by Thermo Fisher Scientific (2 mentions)
Sodium hydroxide (naoh), by Merck Group (2 mentions)
E toxate kit, by Merck Group (1 mentions)
Lino3, by Merck Group (1 mentions)
Nb2o5, by Merck Group (1 mentions)
Fe2o3, by Merck Group (1 mentions)
Mg no3 2 6h2o, by Merck Group (1 mentions)
Tetraethyl orthosilicate teos, by Merck Group (1 mentions)
C6h8o7, by Merck Group (1 mentions)
28 protocols using sr no3 2
1
Synthesis and Characterization of Strontium-Substituted Hydroxyapatite
2
Solid-State Synthesis of Perovskite Oxides
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All the samples in the present work were prepared by conventional solid‐state reaction (SSR). Nb2O5 (99.99%), Ba(NO3)2 (≥99%), Sr(NO3)2 (≥99%), Co(NO3)2·6H2O (≥98%), KNO3 (≥99%), LiNO3 (99.99%), and Fe2O3 (99.995%) were purchased from Aldrich Ltd. and used as starting materials. For the preparation of the SBN, SBNC30, SBNC45, and SBNC60 samples, the corresponding chemicals were mixed homogeneously in stoichiometric ratios according to the formula Sr0.5Ba0.5Nb2‐xCoxO6‐δ (x = 0, 0.3, 0.45, 0.6). The mixed powders were first pressed into pellets under axial pressure (8 MPa) and calcinated at 700 °C for 2 h in air. After cooling down, these pellets were reground into fine powders and repressed into pellets under axial pressure (12 MPa). After sintering at 1150 °C for 12 h in air atmosphere, all the pellets were ground for 2 h before characterizations and electrochemistry tests. Sr0.5Ba0.5Fe0.45Nb1.55O6 denoted as SBNF45 and Sr0.4Ba0.4Co0.2Nb2CoO6 denoted as (SBC)N were also prepared under the same conditions. KNb0.775Co0.225O3 (KNC), LiNb0.925Co0.075O3 (LNC075), and LiNb0.775Co0.225O3 (LNC225) were prepared by following the same procedure except for their relatively lower final sintering temperature (1000 °C). Commercial IrO2 (99.9%) with a Brunauer–Emmett–Teller (BET) surface area of ≈32.5 m2 g−1 was also purchased from Aldrich Ltd. and tested after grinding.
3
Synthesis of Sr-Doped Cu-GO-TiNT Nanomaterials
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First, the GO-TiNT material was doped with an optimum 0.5 wt %
copper following an incipient wetness impregnation method as described
in earlier work44 (link) using Cu(NO3)2·3H2O (Sigma-Aldrich, 99%) as precursor.
The paste obtained was dried in an oven at 50 °C for 20 h under
vacuum and then calcined under air at 400 °C for 2 h (2 °C/min,
60 mL/min). The resulting nanomaterials are named Cu-GO-TiNT. Second,
different amounts of strontium (0.2, 0.4, 0.6, 0.8, and 1.0 wt %)
were incorporated using a similar incipient wetness impregnation procedure
using Sr(NO3)2 (Sigma-Aldrich, 99.9%) as precursor.
Further post-thermal treatment was performed at 400 °C for 2
h using the same procedure as that for copper. Samples were then named
as xwt%Sr-Cu-GO-TiNT with x being
the weight percentage in strontium used.
copper following an incipient wetness impregnation method as described
in earlier work44 (link) using Cu(NO3)2·3H2O (Sigma-Aldrich, 99%) as precursor.
The paste obtained was dried in an oven at 50 °C for 20 h under
vacuum and then calcined under air at 400 °C for 2 h (2 °C/min,
60 mL/min). The resulting nanomaterials are named Cu-GO-TiNT. Second,
different amounts of strontium (0.2, 0.4, 0.6, 0.8, and 1.0 wt %)
were incorporated using a similar incipient wetness impregnation procedure
using Sr(NO3)2 (Sigma-Aldrich, 99.9%) as precursor.
Further post-thermal treatment was performed at 400 °C for 2
h using the same procedure as that for copper. Samples were then named
as xwt%Sr-Cu-GO-TiNT with x being
the weight percentage in strontium used.
4
Synthesis of Mesoporous Silica-Based Nanoparticles
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The synthesis of silica-based MSNs, SiO2 (MSi), two types of SiO2CaO (50SiO250CaO and 60SiO240CaO mol, respectively) (MSiCa50 and MSiCa60) and SiO2CaOMgO with the nominal composition of akermanite (Ca2MgSi2O7) (MAk), was performed through a modified sol–gel method, using cetyltrimethylammonium bromide (CTAB) as agent for the mesoporous structure. Moreover, Sr-doped MSNs were successfully synthesized also with SrO being added in percentages of 2, 4 and 6% mol, replacing Mg in the nominal composition of akermanite (MAkSr2, MAkSr4 and MAkSr6, respectively). The reactants were sodium hydroxide (NaOH, alkaline medium), CTAB, tetraethyl orthosilicate (TEOS), Ca(NO3)2.4H2O, Mg(NO3)2.6H2O and Sr(NO3)2 from Sigma-Aldrich (now Merck KGaA, Darmstadt, Germany). The final molar ratios were 1TEOS/0.13CTAB/0.4NaOH/1280H2O. All the synthesized materials were dried at 60 °C overnight and underwent calcination at 600 °C for 5 h to remove CTAB.
5
Synthesis of Luminescent Materials
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La(NO3)3·6H2O (99.9%), Fe(NO3)3·9H2O (99.9%), Sr(NO3)2 (99.9%), and C6H8O7 (99%), NH4OH (33%), HNO3 (65%), and CTAB (99%) were purchased from Sigma Aldrich. CR dye, C32H22N6Na2O6S2 (Brixworth, Northants, United Kingdom). All chemicals were used as-received.
6
Synthesis of Sr-Me-Fe Oxide Particles
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SrMe2Fe16O27 particles were synthesized utilizing a sol-gel autocombustion method due to the high chemical homogeneity achieved in these syntheses (Hench & West, 1990 ▸ ). The method contains three steps: first Sr(NO3)2, Me(NO3)2·6H2O and Fe(NO3)3·9H2O (all Sigma-Aldrich technical grade with purity >98%) were dissolved in demineralized water in stoichiometric molar ratios [Sr2+]:[Me2+]:[Fe3+] = 1:2:16. Citric Acid was dissolved and added in equal ratio to the nitrates, [C8H8O7] = 2[Sr2+] + 4[Me2+] + 48[Fe3+], under constant stirring. The solution was neutralized with NH4OH and dried overnight in a convection oven at 100°C until a gel was formed. In the second step, the gel was fired in a preheated furnace at 350°C for 30 min until the autocombustion had finished and subsequently cooled to room temperature in air. Finally, the resulting powder was crushed and fired in a furnace at 1200°C (SrMg2Fe16O27 and SrZn2Fe16O27) or 1300°C (SrNi2Fe16O27 and SrCo2Fe16O27) according to the following heating scheme: with a holding time of 2 h before cooling to room temperature.
7
Synthesis of LSCFP Nanofiber Electrodes
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Stoichiometric amounts of La(NO3)3·6H2O (99.9%, Alfa Aesar), Sr(NO3)2 (99.99%, Sigma-Aldrich), Co(NO3)2·6H2O (99.99%, Alfa Aesar), and Fe(NO3)3·9H2O (99.99%, Alfa Aesar) and Pd(OCOCH3)2 (99.999%, Sigma-Aldrich) were dissolved in a Dimethylformamide (Alfa Aesar) solvent. Subsequently, Polyvinylpyrrolidone (Sigma-Aldrich) polymer was added to the precursor solution and stirred until a viscous LSCFP polymer precursor solution was obtained. The solution was then pumped through a plastic syringe using a 25-gauge plastic needle nozzle at a feed rate of 0.25 mL h−1. A high voltage of 17.5 kV was applied to the needle, while the collector was grounded at 0 V, and the distance between the needle and collector was fixed at approximately 17–18 cm. The resulting as-electrospun nanofibers were calcined in air at 1000 °C for 2 h, at a heating rate of 2 °C min−1 to obtain the fiber ash. For the F-LSCFP electrode ink, the LSCFP nanofiber ash was ultrasonically dispersed and mixed with a binder (441 ESL, Electro Science) at a ratio of 0.15 to 0.2. The H-LSCFP electrode ink followed the same procedure but also included crushed LSCFP nanofibers. A comprehensive depiction of the electrospinning process employed for the synthesis of LSCFP nanofibers is shown in Fig. S1 , while a step-by-step description of the H-LSCFP electrode fabrication procedure is illustrated in Fig. S2 .
8
Magnesium Surface Deposition Protocol
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Deposition solution to coat the magnesium surface was prepared by dissolving Ca(NO3)2·4H2O (Sigma-Aldrich, Saint Louis, MO, USA), NaH2PO4·2H2O (Sigma-Aldrich, Saint Louis, MO, USA), and Sr(NO3)2 (Sigma-Aldrich, Saint Louis, MO, USA) in distilled water. The exact concentration of each content is tabulated in Table 1 .
9
Synthesis of Metal-Organic Compounds
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The Rhodamine B, etilenediamine (EDA), methyl acrylate, methanol, dimethyl sulfoxide (DMSO), FeSO4·7H2O, CuSO4·5H2O, PbSO4, CoCl2·6H2O, Sr(NO3)2, CaCl2·2H2O, Zn(NO3)2, Ag2SO4, Hg(NO3)2·H2O, CdSO4·2.67H2O were from Sigma Aldrich (Slovenia). MgCl2·6H2O, NaNO3 and KNO3 were provided by Alkaloid Skopje. NiCl2·6H2O, LiCl, AlCl3·6H2O and Mn(CH3COO)2·6H2O were purchased from Kemika (Slovenia). The Na2CO3 and NaHCO2 were provided by Riedel-de Haën (Slovenia). All of the reagents were used as received. The solvent used in synthesis was of analytical grade.
10
Fabrication of Bioactive Glass with Dopants
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The bioglass base composition used in this study was prepared based on the Bioglass® developed by Hench et al. (46.1SiO2-24.4Na2O-26.9CaO-2.6P2O5, mol%). The bioglass composition was modified by the incorporation of various concentrations (0.25, 0.5, 1, and 2, mol%) of ZnO (Zn0.25, Zn0.5, Zn1, and Zn2), MgO (Mg0.25, Mg0.5, Mg1, and Mg2), and SrO (Sr0.25, Sr0.5, Sr1, and Sr2). The chemical precursors, including SiO2, P2O5, CaCO3, Na2CO3, and MgO, or Sr(NO3)2 or ZnO, supplied by Sigma-Aldrich, Darmstadt, Germany, with a high purity grade (≥99%), were mixed and homogenized using a planetary ball-milling process for 1 h at 300 rpm. The obtained powders were calcined for 8 h at 800 °C and then melted in a platinum crucible at 1300 °C for 1 h. To ensure greater sample homogeneity, the bioactive glass was re-melted using the same parameters. To control the thickness of the samples, the molten glass was quenched between two casting plates, at room temperature, to obtain bulk glass samples. After, the obtained samples were polished to achieve uniform dimensions of approximately 1 mm in thickness.
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