Fine-diameter Si–B–C–N ceramic fibers enabled by polyborosilazanes with N–methyl pendant group

Ji, Xiaoyu; Gao, Hongfei; Zhang, Shuai; Ji, Ming-Sheng; Zhou, Xingui; Shao, Changwei

doi:10.1016/j.jeurceramsoc.2021.04.035

Cited by 14 publications

(4 citation statements)

References 49 publications

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“…Moreover, the N 1s spectrum revealed peaks at ∼395, ∼397.4, ∼397.5–397.65, ∼398.6, ∼397.28, and ∼400.18 eV corresponding to N–N, N–C, N–H, pyridinic N (N-6), N–H, and C–N 3 bonds, respectively. Similarly, the Si 2p spectrum appeared at 100.8–103.78 eV corresponding to Si–C and Si–O–C bonds, respectively. The reflected bonding between elements also confirms the composition between GE-SA and MSAC and the adsorption of Doxo.HCL on/in the surface of MSAC.…”

Section: Resultsmentioning

confidence: 97%

Agro-Waste Valorization into Carbonaceous Eco-Hydrogel: A Circular Economy and Zero Waste Tactic for Doxorubicin Removal in Water/Wastewater

Devre,

Gore

2023

Langmuir

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The existing work aims to evaluate the efficiency of eco-hydrogel for adsorption of pollutants prepared from biopolymeric matrix and agricultural waste-derived biochar. An efficient and reusable adsorbent, designed from the integration of maize stalk activated carbon into a gelatin-alginate composite (MSAC@GE-SA) was explored for removal of doxorubicin hydrochloride (Doxo.HCL) from polluted water. The structural properties, presence of surface functional groups, and elemental composition were explored using XRD, SEM, BET, FTIR, and XPS techniques. The key adsorption parameters such as Doxo.HCL concentration, MSAC@GE-SA amount, solution pH, and the contact time between adsorbate and adsorbents were successfully optimized for the effective removal of Doxo.HCL (q max = 239.41 mg g −1 ). The kinetic mechanism of MSAC@GE-SA fits well with a pseudo-second-order rate model (R 2 = 0.980), followed by mono-and multilayered Langmuir and Freundlich isotherms with R 2 values 0.991 and 0.993, respectively. The recyclability of MSAC@GE-SA showed great stability without any physical damage and having sustained removal efficiency up to 10 cycles (96.32 to 55.66%).

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Section: Resultsmentioning

confidence: 97%

Agro-Waste Valorization into Carbonaceous Eco-Hydrogel: A Circular Economy and Zero Waste Tactic for Doxorubicin Removal in Water/Wastewater

Devre,

Gore

2023

Langmuir

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“…Xiaoyu Ji recently reported high demand for growing high-temperature structural and functional materials of Si-B-(C)-N ceramic fibers [81]. Hexamethyldisilazane and hexamethyldisilazane polymers are used as co-condensing agents to polymerize silicon and boron chloride monomers, which can tradeoff between spinnability and ceramic yield of polyborosilazanes (PBSZs).…”

Section: Polymer Backbone Structurementioning

confidence: 99%

Approaches to Preceramic Polymer Fiber Fabrication and On-Demand Applications

Veettil

Kollarigowda²,

Thakur

2022

Materials

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The demand for lightweight, high-modulus, and temperature-resistant materials for aerospace and other high-temperature applications has contributed to the development of ceramic fibers that exhibit most of the favorable properties of monolithic ceramics. This review demonstrates preceramic-based polymer fiber spinning and fiber classifications. We discuss different types of fiber spinning and the advantages of each. Tuning the preceramic polymer chemical properties, molar mass, functional chemistry influences, and incorporation with fillers are thoroughly investigated. Further, we present the applications of preceramic-based polymer fibers in different fields including aerospace, biomedical, and sensor applications. This concise review summarizes recent developments in preceramic fiber chemistry and essential applications.

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“…In recent years, amorphous ceramics such as SiCN, SiBN, and SiBNC prepared from organosilicon polymer precursors have attracted extensive attention due to their noteworthier high‐temperature stability and good oxidation resistance. Reports show that SiBNC ceramics remain distinctly stable at temperatures as high as 2000°C, which presents prized application prospects 1–12 . However, the properties of polymer‐derived SiBNC ceramics deteriorate after exposure to 1500°C for more than 24 h. The originally amorphous oxide layer crystallizes, and there is a generation of bubbles (presumed to result from the volatilization of B 2 O 3 formed during oxidation).…”

Section: Introductionmentioning

confidence: 99%

“…Reports show that SiBNC ceramics remain distinctly stable at temperatures as high as 2000 • C, which presents prized application prospects. [1][2][3][4][5][6][7][8][9][10][11][12] However, the properties of polymer-derived SiBNC ceramics deteriorate after exposure to 1500 • C for more than 24 h. The originally amorphous oxide layer crystallizes, and there is a generation of bubbles (presumed to result from the volatilization of B 2 O 3 formed during oxidation). A similar phenomenon was observed during the high-temperature oxidation of bulk SiC with boron as a sintering aid.…”

Section: Introductionmentioning

confidence: 99%

Effects of hafnium sources and hafnium content on the structures and properties of SiBNC–Hf ceramic precursors

et al. 2023

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The synthesis of SiBNC–M (M is metal element) multinary ceramic precursors has mainly been through chemical modification of the SiBNC ceramic precursors with the introduction of the metal element/compound. This misses the simplicity, efficiency, and combined benefits of single reactor synthesis routes. We herein adopt a one‐pot method to synthesize SiBNC–Hf ceramic precursors (PBSHZ) from different Hf sources, and with varying Hf content. The starting materials include hafnium tetrachloride, hafnium dichloride, trichlorosilane, hexamethyldisilazane, and boron trichloride. Fourier transform infrared spectroscopy (FT‐IR), nuclear magnetic resonance (NMR), X‐ray photoelectron spectroscopy (XPS), and thermogravimetric analysis are employed to characterize the structures and properties of the PBSHZ. The results reveal the successful incorporation of Hf into the precursors. Compared to the hafnium tetrachloride source, the precursor synthesized from hafnium dichloride yields more ceramics and shows better solubility, due to fewer Hf–Cl bonds available for reaction. Meanwhile, there is a positive correlation between the rise in the Hf content of PBSHZ and the ceramic yield. However, the solubility and processability of the precursors decline, due to the multiplication of the cross‐linking degree in the molecular structure. Further FT‐IR, NMR, XPS, and thermogravimetry–mass spectrometry (TG–MS) analysis indicate a full polymer‐to‐ceramic transformation at 1000°C pyrolysis temperature. At this point, the SiBNC–Hf ceramics mainly consist of an Si–B–N skeleton, HfN, and free carbon.

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Fine-diameter Si–B–C–N ceramic fibers enabled by polyborosilazanes with N–methyl pendant group

Cited by 14 publications

References 49 publications

Agro-Waste Valorization into Carbonaceous Eco-Hydrogel: A Circular Economy and Zero Waste Tactic for Doxorubicin Removal in Water/Wastewater

Agro-Waste Valorization into Carbonaceous Eco-Hydrogel: A Circular Economy and Zero Waste Tactic for Doxorubicin Removal in Water/Wastewater

Approaches to Preceramic Polymer Fiber Fabrication and On-Demand Applications

Effects of hafnium sources and hafnium content on the structures and properties of SiBNC–Hf ceramic precursors

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