Tuning the Magnetic Properties of Two-Dimensional MXenes by Chemical Etching

Allen-Perry, Kemryn; Straka, Weston; Keith, Danielle; Han, Shubo; Reynolds, C. L.; Gautam, Bhoj; Autrey, Daniel

doi:10.26434/chemrxiv.13523939.v1

Cited by 3 publications

(3 citation statements)

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“…A SQUID VSM was used to measure the magnetic moment followed by the applied magnetic eld and temperature in a 1T applied magnetic eld to see how the amount of etching in uenced the magnetic properties. Figure 8 illustrates the Ti 3 AlC 2 -TiC composites' eld-dependent magnetization at 2-300 K. e magnetization at 2 K and 7 T was 0.2017 emu/g for the Ti 3 AlC 2 -TiC composites but reduced to 0.1758 emu/g at 300 K. Although the magnetization curve did not saturate at 7T, the larger magnetization in Ti 3 AlC 2 -TiC composites proposed that it was ferromagnetic, which was similar to the reported Ti 3 AlC 2 [33]. Moreover, the magnetization of Ti 3 AlC 2 -TiC composites sintered under high pressure is larger than that of commercial Ti 3 AlC 2 powders (particle size >200 mesh) with a purity of 98%.…”

Section: Magnetic Properties Of Ti 3 Alc 2 -Tic Compositessupporting

confidence: 80%

The Influence of Sintering Pressure on the Preparation, Friction Properties, and Magnetic Properties of Ti2AlC-TiC and Ti3AlC2-TiC Composites Under High-Pressure and High-Temperature

Yuqi

2022

Advances in Materials Science and Engineering

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Due to their high melting point, low density, and affordable price, TiC ceramics have emerged as one of the most promising ultrahigh temperature structural materials. However, its development and usage are severely constrained by its weak mechanical characteristics. The Ti2AlC-TiC and Ti3AlC2-TiC composites were synthesized by using the laminated metal-ceramic Ti2AlC/Ti3AlC2 as the binder, combined with high-temperature and high-pressure sintering technology (GPa order of magnitude confinement system). The thermal analysis shows that the exothermic heat of Ti/1.2Al/2TiC is less than that of 3Ti/1.2Al/2C, 2Ti/1.2Al/C, and 3Ti/1.5Al/C. The ratio of Ti/1.2Al/2TiC can suppress the thermal explosion phenomenon during the sintering process and improve the safety of the high-pressure sintering process. XRD results showed that the main composition of the sintered products was Ti2AlC-TiC at 2∼3.5 GPa and Ti3AlC2-TiC at 4∼5 GPa. As the sintering pressure increased from 2 GPa to 5 GPa, the bonding phase changed from Ti2AlC to Ti3AlC2. The thickness of the synthetic Ti3AlC2 layer is near 0.1 µm under 5 GPa. The average friction coefficient of Ti2AlC-TiC composites sintered 2 GPa with POM is as low as 0.1767, while the average friction coefficient of Ti3AlC2-TiC composites with POM increased to 0.3468∼0.3797. The wear width of Ti2AlC-TiC is lower than that of Ti3AlC2-TiC composites sintered under 4–4.5 GPa. The wear width of Ti3AlC2-TiC composites decreases following the rise of sintering pressure and is reduced to 0.3504 mm under 5 GPa. Ti2AlC-TiC and Ti3AlC2-TiC composites with PP ball counterparts have friction coefficients of 0.375 to 0.45 and worse wear resistance than that of POM balls. Ti3AlC2-TiC composites synthesized at 5 GPa with a Cu ball had the smallest friction coefficient (0.4558) and the smallest wear scar width (0.6289 mm). The friction coefficients and wear widths of synthetics with Al pairs ranged from 0.48–0.697 and 0.851–1.087 mm, respectively, and varied irregularly with increasing sintering pressure. Ti2AlC-TiC composites synthesized at 2 GPa with agate and glass pairs have coefficients of friction of 0.5 and 0.61, respectively. Abrasion widths of Ti2AlC-TiC composites synthesized at 2 GPa with agate and glass pairs were 1.3 mm and 0.72 mm, respectively. The friction coefficient of synthetics with agate and glass pairs increases with increasing sintering pressure. The magnetization and magnetization intensity of the Ti3AlC2-TiC composites are stronger than those of Ti3AlC2. Ti2AlC-TiC and Ti3AlC2-TiC composites held promise to serve in the field of ceramic grinding processing applications.

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Section: Magnetic Properties Of Ti 3 Alc 2 -Tic Compositessupporting

confidence: 80%

The Influence of Sintering Pressure on the Preparation, Friction Properties, and Magnetic Properties of Ti2AlC-TiC and Ti3AlC2-TiC Composites Under High-Pressure and High-Temperature

Yuqi

2022

Advances in Materials Science and Engineering

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“…The samples were further characterized by XRD and Raman spectroscopy. Regarding the phase composition of various samples, it can be seen from the XRD patterns (Figure 3A) compared with Ti 3 AlC 2 that the position of the (002) main peak of Ti 3 C 2 T x is shifted to the left by a certain angle, and the peak intensity becomes shallower and wider, indicating the decreasing of crystallization degree and the increasing of the interlayer space after etching (Allen-Perry et al, 2021). All coated samples exhibited typical α-Ti features (Jin et al, 2014), but the intensity of the main Ti phase peak was lower than that of No shift to the low-angle side was observed.…”

Section: Discussionmentioning

confidence: 99%

Electrophoretic-deposited MXene titanium coatings in regulating bacteria and cell response for peri-implantitis

Huang

2022

Front. Chem.

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Background: Two-dimensional(2D)MXenes have continued to receive increasing interest from researchers due to their graphene-like properties, in addition to their versatile properties for applications in electronic devices, power generation, sensors, drug delivery, and biomedicine. However, their construction and biological properties as titanium coatings to prevent peri-implantitis are still unclear.Materials and methods: In this work, few-layer Ti3C2Tx MXene coatings with different thicknesses at varied depositing voltages (30, 40, and 50 V) were constructed by anodic electrophoretic deposition without adding any electrolytic ions. In vitro cytocompatibility assay was performed on preosteoblasts (MC3T3-E1) cell lines after the characterization of the coating. Meanwhile, the antibacterial activity against bacteria which are closely related to peri-implantitis including Staphylococcus aureus (S. aureus) and its drug-resistant strain MRSA was further investigated.Results: MXene-coated titanium models with different thicknesses were successfully assembled by analyzing the results of characterization. The compounding of Ti3C2Tx could significantly improve the initial adhesion and proliferation of MC3T3-E1 cells. Moreover, the coating can effectively inhibit the adhesion and cell activity of S. aureus and MRSA, and MRSA expressed greater restricting behavior than S. aureus. The ability to promote antibacterial activity is proportional to the content of Ti3C2Tx. Its antioxidant capacity to reduce ROS in the culture environment and bacterial cells was first revealed.Conclusion: In summary, this work shows a new avenue for MXene-based nano-biomaterials under the clinical problem of multiple antibiotic resistance.

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“…The lower stability of the -OH termination is because hydrogen atoms can substitute OH terminates or convert into -O terminated at high temperatures, which all involve low stability of -OH terminations. 69,70 Therefore, as can be seen, it is very remarkable to control the ending group of the MXene surface to acquire high-quality MXene with a specific surface area and feasible for being utilized in certain applications.…”

Section: Influence Of Synthesis Strategies On Mxenes Structurementioning

confidence: 99%