INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
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2023
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IF 5.2
Jinpeng Lv,Jiadi Xie,Neshchimenko Vitaly
Implementation of lightweight and long-lasting thermal-control coatings (TCCs) is vital for regulating the surface temperature and energy consumption of spacecraft. Herein, Zn 2 SiO 4 and hexagonal boron nitride (hBN) based inorganic TCCs are developed with potassium silicate binder. The α s /ε H (solar absorptance/ hemispherical emittance) ratio of the Zn 2 SiO 4 , ZnO and hBN coatings are 0.096, 0.190 and 0.107, respectively. Compared to the classical ZnO based Z-93 coating, both Zn 2 SiO 4 /K 2 SiO 3 and hBN/K 2 SiO 3 coatings show superior initial thermophysical properties. After vacuum-proton irradiation, the α s of Zn 2 SiO 4 , Z-93 and hBN coatings increased from 0.091, 0.167 and 0.098 to 0.193, 0.253 and 0.241, respectively. Apparently, the as-developed Zn 2 SiO 4 coating exhibits exceptional heat-dissipation and radiation-resistance features in relation to the hBN and Z-93 TCCs.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
·
IF 8.6
Dapeng Sun,Run Li,Ming Wen,Xin Zhang,Min Chen,Haowei Yang,Denggao Guan,Cigang Xu,Guoshu Zhang
The development and application of nuclear energy involves a challenging process of separating H 2 O/HTO to treat tritium-containing radioactive wastewater (HTO). Recently graphene oxide (GO)-based membrane distillation process has shown good performance for the separation of H 2 O/D 2 O used as a laboratory model research process for H 2 O/HTO separation, but further development of novel membrane materials or structures for membrane distillation process to give higher permeation flux or separation factor is still desirable. Here, boron nitride (BN) and molybdenum disulfide (MoS 2 ) were investigated as membrane materials in the type of PTFE supported membrane, and PTFE/BN membrane showed higher permeation flux than PTFE/MoS 2 and PTFE/GO membrane, and higher separation factor than PTFE/GO membrane that was higher than PTFE/MoS 2 membrane. Furthermore, binary PTFE/BN/GO and PTFE/MoS 2 /GO heterostructure composite membranes were explored. The permeation flux of PTFE/BN/GO membrane was higher than that of PTFE/MoS 2 /GO and PTFE/GO/GO membrane. The separation factor of PTFE/BN/GO membrane was higher than that of PTFE/GO/GO membrane, which was higher than that of PTFE/MoS 2 /GO membrane. These results suggest that other 2D material- or heterostructure membranes can give performance comparable with or even better than GO membrane for the separation of H 2 O/D 2 O. This can guide for further exploration of novel materials or membrane structures for membrane distillation process with higher performance to provide a solution for the treatment of tritium-containing radioactive wastewater in the nuclear energy sector.
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CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Sheng Li,Sidra Subhan,Liqin Zhou,Jing Li,Zhongxing Zhao,Zhenxia Zhao
Improving the adsorption capacity of the volatile organic compounds (VOCs) will inevitably decrease the desorption efficiency and hence increase more energy-consumption, which has become a crucial challenging problem for MOFs modification and composition toward VOCs adsorption. Herein, a thermal-conductive composition strategy was proposed to anchor BN nanosheets (BNNS) into HKUST-1 crystals via “N/O-Cu-O” interface. The formed HKUST-1@BNNS composite maintained high surface area (1633.7 m 2 /g having more microporous) and enhanced heat diffusivity (1.8 times of HKUST-1), simultaneously. This enabled significant increase of toluene adsorption capacity on HKUST-1@BNNS up to 4.3 mmol/g (2.8 times of HKUST-1) at ultra-low pressure ( P / P 0 ≈ 0.001) and higher desorption rate of toluene ( k ds = 29.3 × 10 −2 , 4.0 times of HKUST-1) with lower desorption activation energy ( E d = 33.5 kJ/mol). Compared with many other state-of-the-art adsorbents (e.g., MOFs, zeolites and activated carbons), it has a much higher adsorption capacity and regeneration rate. Thus, thermal-conductive MOFs construction can be deemed as smart strategy to enhance adsorption efficiency and save desorption energy for VOCs capture.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Jiemei Yu,Zhankun Jiang,Taizhong Huang,Chengchun Tang
Preparing economic, stable, and highly efficient non-precious-metal materials for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is of great significance to the development of storage technologies and energy conversion. In this manuscript, we report a novel Cu based nano-catalyst as an electrode material fabricated by complexation-reduction method. Benefit from the stable of h-NB and the good electrical conductivity of CNT , the tri-functional electrocatalyst BN/Cu/CNT displays enhanced activity towards ORR and with the high current density of 0.95 mA/cm 2 , which is comparable to that of commercial Pt/C catalyst (cathodic peak current: 1.05 mA/cm 2 ). The BN/Cu/CNT also demonstrates high catalyst activity for the OER. From the rotating disk electrode and rotating ring-disk electrode tests, the number of electrons exchanged during the ORR is revealed to be 3.92, suggesting a 4e − pathway of O 2 reduction to H 2 O. The as prepared catalyst also has good stability and superior methanol tolerance to the commercial Pt/C catalyst in alkaline medium . Thus, it is anticipated that the BN/Cu/CNT catalyst is surely helpful for providing a new space to develop Pt-free catalyst.
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Catalysts
·
2022
·Vol. 12
·期 5
·555
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IF 4.501
Qiong Lu,Jing An,Yandong Duan,Qingzhi Luo,Yunyun Shang,Qiunan Liu,Yongfu Tang,Jianyu Huang,Chengchun Tang,Rong Yin,Desong Wang
The modification of inert boron nitride by carbon doping to make it an efficient photocatalyst has been considered as a promising strategy. Herein, a highly efficient porous BCN (p-BCN) photocatalyst was synthesized via precursor reconfiguration based on the recrystallization of a new homogeneous solution containing melamine diborate and glucose. Two crystal types of the p-BCN were obtained by regulating the recrystallization conditions of the homogeneous solution, which showed high photocatalytic activities and a completely different CO2reduction selectivity. The CO generation rate and selectivity of the p-BCN-1 were 63.1 μmol·g−1·h−1and 54.33%; the corresponding values of the p-BCN-2 were 42.6 μmol·g−1·h−1and 80.86%. The photocatalytic activity of the p-BCN was significantly higher than those of equivalent materials or other noble metals-loaded nanohybrids reported in the literature. It was found that the differences in the interaction sites between the hydroxyl groups in the boric acid and the homolateral hydroxyl groups in the glucose were directly correlated with the structures and properties of the p-BCN photocatalyst. We expect that the developed approach is general and could be extended to incorporate various other raw materials containing hydroxyl groups into the melamine diborate solution and could modulate precursors to obtain porous BN-based materials with excellent performance.Keywords:carbon-doped BN;homogeneous;precursor reconfiguration;photocatalysis;selectivity
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2022
·
IF 9.879
Xinxin Du,Wulin Yang,Jiajun Zhu,Licai Fu,Deyi Li,Lingping Zhou
Construction of interconnected heat conductive network in polymer is essential to effectively transport heat in thermal management materials. Due to synergistic effect , hybrid fillers are increasingly utilized in composites for higher thermal conductivity , but how to achieve better enhancement is still an open problem. In this paper, a pod-like 3D interconnected heat percolation network was obtained by aligning diamond inside boron nitride (BN) honeycomb. The BN honeycomb used as secondary templets was prepared by ice template method . Subsequently, the epoxy (EP) and diamonds were filled into it simultaneously by vacuum infiltration . SEM and computed tomography results demonstrated that highly ordered thermal conductive channels have been constructed. When the content of BN is 7 vol% and diamond is 12 vol%, the thermal conductivity of the composite is as high as 2.720 W/(m·K), which is 12.5 and 5.8 times higher than that of pure EP and randomly mixed sample, respectively. To better understand the enhance mechanism, through the parallel structural model calculations, the effective thermal conductivity of the local tightly packed diamond part was increased from 1.210 W/(m·K) to 11.318 W/(m·K) in the composite. The findings suggested that the bridging effect of BN wall on connecting diamond particles also contributed to enhanced property of the composite. This study offers a novel strategy for obtaining higher thermal conductivity with low filler loading in hybrid composites.
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MEASUREMENT SCIENCE and TECHNOLOGY
·
2021
·Vol. 32
·期 9
·095114
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IF 2.046
Qianchun Zhang,Yan Wang,Qin Zhou,Yafei Chen,Yuguo Zheng,Shan Tang,Yuxian Zhao,Li Jiang
Nonmetallic nanocatalysts have demonstrated powerful potential in cataluminescence (CTL) sensing fields. In this study, an original method for the fabrication of a CTL gas sensor was developed to detect acetylacetone based on nanosized hexagonal boron nitride (h-BN). The luminescence characteristics and optimum operating temperature, wavelength, and carrier gas flow rate parameters for the h-BN sensor were studied in detail. Compared with other common gases (such as cyclohexanone, acetaldehyde, and acetone), the fabricated sensor demonstrated a high selectivity and sensitivity toward acetylacetone. This was verified by density functional theory calculations, which were consistent with the experimental results. The CTL intensity and concentration of acetylacetone had a linear relationship in the range of 0.050–20 μg ml−1 (r = 0.9989) with a low detection limit of 16 ng ml−1 (S/N = 3). The developed sensor was applied to analyze spiked samples, and satisfactory recoveries for acetylacetone of 82.2%–118% were obtained with excellent reproducibility (2.8%–11%). These results indicated that the system has excellent sensing properties including a high selectivity, sensitivity, and stability, proving its broad application prospects for detecting acetylacetone.
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WEAR
·
2021
·
IF 3.892
F.S. Meng,Z. Li,H.H. Ding,J.S. Hu,W.J. Wang,J. Guo,Q.Y. Liu
The advanced nano-additives can improve the lubrication performance of nanolubricants efficiently, which could greatly reduce energy consumption. Here, we prepared the BN coated with carbon layer (BN@C) by a novel hydrothermal coating method with pristine BN nanosheets as matrix material and glucose as carbon source. And the BN@C exhibited excellent lubrication performance as a lubricant additive . In order to investigate the tribological properties, BN@C was modified with oleic acid as a surfactant , and the friction tests were carried out on an MRS-10A four-ball friction and wear tester. Benefitting from the stable dispersity, ultrasmall particle size and the surface carbon layer of BN@C-OA, the lubrication performance was significantly improved. More impressively, BN@C-OA could enter the interface of friction pairs . The interlayer sliding occurred to improve the anti-wear and anti-friction properties. This study could provide a new avenue to synthesize the coating-containing nanocomposite additive to promote the lubrication properties of nanoparticles in oil.
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CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Fuhai Liu,Maozhong Yi,Liping Ran,Yicheng Ge,Ke Peng
In this study, with 2.5D needle punched carbon felt as reinforcement, hexagonal boron nitride (h-BN) was introduced through chemical vapor infiltration (CVI) and slurry impregnation (SI) methods, and then pyrocarbon was deposited through CVI to convert the BN-containing preform into carbon fiber reinforced carbon-boron nitride binary matrix composites (C/C-BN). The microstructure and mechanical properties of C/C-BN(P) composites prepared by SI combined with CVI were compared with those of C/C-BN(CVI) composites prepared by CVI. The tribological behavior of C/C-BN(P) composites containing different contents of h-BN fillers and C/C-BN(CVI) composites with and without heat treatment was investigated by the ball-on-disk technique in dry sliding conditions using GCr15 steel balls and Si 3 N 4 balls as sliding counterparts at two different sliding speeds (v = 0.2 and 0.8 m/s), and compared with the C/C composites used as a reference. C/C-BN(P) composites exhibit improved tribological behavior, which can be explained by the combined effect of SI and CVI on the microstructure and mechanical properties, leading to changes in the wear mechanism of the C/C-BN composites. The excellent reinforcement is attributed to the integrity structure of the C/C-BN(P), which can make the self-lubricating friction layer stably exist on the surface of the material and significantly reduce the friction coefficient and wear loss of the C/C-BN(P) composite. Furthermore, the mechanical and tribological properties of C/C-BN(P) composites can be adjusted by using different volume content of h-BN. The present work shows that C/C-BN(P) composites have wide application prospects as anti-friction and wear-resistant materials.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Zhao Du,Lang Feng,Zhonglu Guo,Tongqi Yan,Qi Hu,Jing Lin,Yang Huang,Chengchun Tang,Yi Fang
Herein, a series of ultrathin h-BN/Bi 2 MoO 6 heterojunction with excellent photocatalytic activity has been firstly prepared via a feasible solvothermal method . Our results suggest that the optimized photocatalyst possesses a high degradation ratio of tetracycline (TC), oxytetracycline (OTC) and doxycycline (DC) up to 99.19%, 95.28% and 91.04% under visible-light irradiation, respectively. We highlight that the outstanding photocatalytic activity is mainly attributed to the prominent performance of tetracycline adsorption on h-BN and the dominant visible-light absorption by Bi 2 MoO 6 as well as the effective photogenerated carrier separation induced by the synergetic effect between h-BN and Bi 2 MoO 6 . Moreover, DFT calculations reveal that the built-in electric field formed between h-BN and Bi 2 MoO 6 gives rise to the separation of carriers and the polarization of tetracycline molecules. Last but not the least, the specific process and micro-mechanism of the photocatalytic tetracycline degradation under visible-light driven have also been illuminated. The present work pioneers the application of ultrathin h-BN/Bi 2 MoO 6 heterojunction as a novel tetracycline degradation photocatalyst and further guides the design of more visible-light photocatalysts.
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PubMed
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Analytical Methods
·
2016
·Vol. 8
·期 12
·2620-2627
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IF 1.915
Xiaoyun Zhang,Ying Chen,Lin Li,Hua Qiao,Rui Wang,Jingman Ni,Jieqiong You,Kaikai Ma,Chenchen Fan,Quan Fang
The objective of this research is to develop a sensitive bioanalytical method and investigate the pharmacokinetics of a new chimeric peptide (BN-9) in rats. According to the analysis criteria, a reversed phase high performance liquid chromatography method with fluorescence detection (HPLC-FLD) was established and employed in monitoring the compound in rat plasma using doxorubicin (DOX) as the internal standard (IS). Fluorescent BN-9 and IS were extracted from plasma using dehydrated alcohol. The mobile phase was composed of acetonitrile and potassium dihydrogen phosphate buffer containing 0.05% trifluoroacetic acid (TFA) (pH 7.4; 0.02 M) (30 : 70, v/v) at 0.7 mL min−1. Fluorescence detection was conducted at 490 nm (excitation wavelength) and 520 nm (emission wavelength). The lower limit of quantification (LLOQ) was 0.009 µg mL−1. The intra-batch and inter-batch precisions were less than 8.116%, and the accuracy was within 5.632%. Blood samples were collected after intravenous administration of fluorescent BN-9 at the doses of 5, 10, and 20 mg kg−1 to rats. The main pharmacokinetic parameters were obtained by non-compartmental and compartmental analysis with DAS 2.1.1 software. The t1/2α values were 9.584 ± 5.137, 8.548 ± 2.093 and 9.621 ± 0.3224 min. The results showed that the method was successfully applied to investigate the pharmacokinetic profiles of fluorescent BN-9 following intravenous administration to rats.
研究领域:
分析化学
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药理学
·
生物化学
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 47
·e56255
·
IF 2.7
Jin Yang,Yixuan Hou,Yingzheng Hong,Yingbang Yao
Since thermally conductive fillers easily aggregate when introduced into polymer matrix, it is essential to apply a modifier to enhance the dispersion of the filler. In current study, the surface of boron nitride (h-BN) is firstly modified by employing a double modification process and then added into sulfonated polyetheretherketone (SPEEK) to form the composite materials. Four different kinds of samples of double-modified h-BN were obtained. Ultimately, the XXX@h-BN/SPEEK (XXX denoted as modifier, i.e. PDA, VTMS, TEOS, and APS) flexible film with the horizontally oriented XXX@h-BN was produced by heating the mixture under an external electric field. The test results indicate that the thermally conductive filler PDA@h-BN (PDA: polydopamine), which was prepared by modifying OH@h-BN with PDA, loaded into SPEEK, and electrically oriented, shows the best overall performances. With a high tensile strength of 43.24 MPa and good flexibility, PDA@h-BN/SPEEK flexible film exhibits an in-plane thermal conductivity of 2.3 Wm −1 K −1 at a filling ratio of 10 wt%. The sample may be bent at a steep angle without breaking down and can recover to original shape bearing its high degree of flexibility.
研究领域:
材料科学
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聚合物工程
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