The aluminothermic reduction of boric acid

Atasoy, Ahmet

doi:10.1016/j.ijrmhm.2010.06.001

Cited by 16 publications

(8 citation statements)

References 20 publications

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“…26 Similarly, residual B 2 O 3 from B-rGOs samples is also deemed unlikely due to the absence of its typical peak at 2θ = 14°. 27 Furthermore, Raman spectroscopy also presented proof on the doping in the graphene lattice. As shown in Figure 3, it is apparent that all samples displayed two prominent bands at ∼1300 and ∼1500 cm −1 which associate to D and G band, respectively.…”

Section: Resultsmentioning

confidence: 92%

Heteroatom Nitrogen- and Boron-Doping as a Facile Strategy to Improve Photocatalytic Activity of Standalone Reduced Graphene Oxide in Hydrogen Evolution

Putri

Ong

et al. 2017

ACS Appl. Mater. Interfaces

132

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Owing to its superior properties and versatility, graphene has been proliferating the energy research scene in the past decade. In this contribution, nitrogen (N-) and boron (B-) doped reduced graphene oxide (rGO) variants were investigated as a sole photocatalyst for the green production of H and their properties with respect to photocatalysis were elucidated for the first time. N- and B-rGOs were facilely prepared via the pyrolysis of graphene oxide with urea and boron anhydride as their respective dopant source. The pyrolysis temperature was varied (600-800 °C for N-rGO and 800-1000 °C for B-rGO) in order to modify dopant loading percentage (%) which was found to be influential to photocatalytic activity. N-rGO600 (8.26 N at%) and B-rGO1000 (3.59 B at%), which holds the highest at% from each of their party, exhibited the highest H activity. Additionally, the effects of the nature of N and B bonding configuration in H photoactivity were also examined. This study demonstrates the importance of dopant atoms in graphene, rendering doping as an effective strategy to bolster photocatalytic activity for standalone graphene derivative photocatalysts.

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Section: Resultsmentioning

confidence: 92%

Heteroatom Nitrogen- and Boron-Doping as a Facile Strategy to Improve Photocatalytic Activity of Standalone Reduced Graphene Oxide in Hydrogen Evolution

Putri

Ong

et al. 2017

ACS Appl. Mater. Interfaces

132

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“…The absence of the typical amorphous XRD band evidences the lack of an important amount of unreacted amorphous boron oxide in the resulting material [31,32]. Alumina peaks are observed.…”

Section: Xrd Of the Alumina-boric Acid Mixtures After Thermal Treatmentsmentioning

confidence: 99%

Formation, microstructure and properties of aluminum borate ceramics obtained from alumina and boric acid

Hernández

Suárez

Cipollone

et al. 2017

Ceramics International

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The formation of aluminum borates (Al 18 B 4 O 33 and Al 4 B 2 O 9) from alumina and boron oxide occurs between 600 and 800°C. These materials have refractory properties and corrosion resistance. The objective of this work is to develop materials from the Al 2 O 3-B 2 O 3 system, employing alumina and boric acid as starting powders, to study the critical processing variables and describe the developed microstructure and properties. Three formulations (13, 19.5 and 26 wt% B 2 O 3) were studied. In order to confirm the formation of borates, the differential thermal analysis and thermogravimetric analysis were carried out. Afterwards, uniaxially pressed disc-shaped specimens were fired at four temperatures above the formation temperature. The textural properties of the ceramics were evaluated by the immersion method, this permit to evaluate the sintering processes. Then the degree of borate formation was confirmed by X-ray diffraction. Finally, the developed microstructures were characterized by scanning electron microscopy, and the diametral compression behavior was evaluated. A series of porous (≈50%) refractory materials from the Al 2 O 3-B 2 O 3 system were developed. The processing strategy resulted in materials with Al 18 B 4 O 33 as the main crystalline phase. Needle grains with diameters between 0.2 and 1 µm and an aspect ratio over 20:1 were obtained. Thus, based on the information gathered from our research, aluminum borate ceramic materials can be designed for structural, insulating or filtering applications employing only alumina and boric acid as boron oxide source.

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“…Besides characterized peaks of CPT nanocrystals at 8.8°, 10.2°, 11.8°, 14.8° and 18.2°, BA-coated CPT nanocrystals showed three distinct peaks at 5.8°, 15.2°, and 28.0°. Peaks at 15.2° and 28.0° were typical peaks for boric acid34 while the peak at 5.8° represented another form of CPT crystals occurred under varied crystallization conditions33.…”

Section: Resultsmentioning

confidence: 99%

Extreme Activity of Drug Nanocrystals Coated with A Layer of Non-Covalent Polymers from Self-Assembled Boric Acid

Zhan

Liang

2016

Sci Rep

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Non-covalent polymers have remarkable advantages over synthetic polymers for wide biomedical applications. In this study, non-covalent polymers from self-assembled boric acid were used as the capping reagent to replace synthetic polymers in drug crystallization. Under acidic pH, boric acid self-assembled on the surface of drug nanocrystals to form polymers with network-like structures held together by hydrogen bonds. Coating driven by boric acid self-assembly had negligible effects on drug crystallinity and structure but resulted in drug nanocrystals with excellent dispersion properties that aided in the formation of a more stable suspension. Boric acid coating improved drug stability dramatically by preventing drug molecules from undergoing water hydrolysis in a neutral environment. More importantly, the specific reactivity of orthoboric groups to diols in cell glycocalyx facilitated a rapid cross-membrane translocation of drug nanocrystals, leading to efficient intracellular drug delivery, especially on cancer cells with highly expressed sialic acids. Boric acid coated nanocrystals of camptothecin, an anticancer drug with poor aqueous solubility and stability, demonstrated extreme cytotoxic activity (IC50 < 5.0 μg/mL) to cancer cells compared to synthetic polymer coated CPT nanocrystals and free CPT. Surface coating using non-covalent polymers from self-assembled boric acid will have wide biomedical applications especially in biomaterials and drug delivery field.

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The aluminothermic reduction of boric acid

Cited by 16 publications

References 20 publications

Heteroatom Nitrogen- and Boron-Doping as a Facile Strategy to Improve Photocatalytic Activity of Standalone Reduced Graphene Oxide in Hydrogen Evolution

Heteroatom Nitrogen- and Boron-Doping as a Facile Strategy to Improve Photocatalytic Activity of Standalone Reduced Graphene Oxide in Hydrogen Evolution

Formation, microstructure and properties of aluminum borate ceramics obtained from alumina and boric acid

Extreme Activity of Drug Nanocrystals Coated with A Layer of Non-Covalent Polymers from Self-Assembled Boric Acid

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