JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Bin Xu,Huiyong Yang,Ruiying Luo,Lianyi Wang,Juntong Huang,Dian Chen
The feasibility of fabricating a BN matrix/fiber interphase of SiC/SiC composites via electrophoresis deposition (EPD) was investigated based on the simplicity and non-destructiveness of the process and the excellent interfacial modification effects of BN. The BN suspension and SiC fiber surface properties were both adjusted to generate suitable conditions for the EPD process of the BN interphase. Next, the deposition dynamics and mechanism were studied under different deposition voltages and time, and the relationship between the deposition morphology of the BN interphase and mechanical properties of the fabricated mini SiC/SiC composites were also discussed. After oxidation at high temperature (600–1000 ℃), the mechanical properties of the mini SiC/SiC composites were studied to verify the oxidation resistance effect of the EPD-deposited BN interphase, whose oxidation resistance mechanism was briefly analyzed as well.
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2023
·Vol. 44
·期 10
·6440-6453
·
IF 5.2
Bi Yang,Beibei Chen,Wenquan Dong,Yang Tong,Jiaye Li
Polymer self-lubricating composite coatings have been widely used on the surface of machinery to extend the life of the moving systems/parts by controlling friction and wear. In this work, epoxy nanocomposite coating with the thickness of about 60 μm was fabricated with addition of hexagonal boron nitride nanosheets (BNNSs)/CeO 2 nanohybrid for enhancement in antifriction and wear resistance. The active BNNSs were first obtained by exfoliating h-BN with alkaline solution, and then the rare earth oxide of CeO 2 nanoparticles were immobilized on the surface of BNNSs through hydrothermal method. The microstructure morphology and chemical composition of as-proposed BNNSs/CeO 2 were characterized by field emission scanning electron microscopy, HRTEM, Fourier transform infrared spectroscopy, RS, X-ray diffraction, and X-ray photoelectron spectroscopy. And the tribological behaviors of epoxy nanocomposite coatings containing BNNSs, CeO 2 , and BNNSs/CeO 2 were investigated comparatively using ball-on disc friction tester (MPX-3). And the 440C stainless-steel ball with diameter of 8 mm was used as the counterface material. Tribological tests showed that epoxy-BNNSs/CeO 2 had the best friction and wear reduction properties, and the lowest coefficient of friction and wear rate of epoxy-based composite coating were achieved when the content of BNNSs/CeO 2 was 0.5 wt%, with 84.9% and 96.3% reduction, respectively. Moreover, the effect of sliding conditions on the tribological performance of epoxy-BNNSs/CeO 2 was investigated. The corresponding enhancing mechanisms of BNNSs/CeO 2 were discussed as well.
✓ 已验证
产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Xinyu Cheng,Yi He,Yi Fan,Liping Yan,Huilian Zhou,Jiamin Zhong,Zhiyuan Li,Jinxue Song
PDA-functionalized h-BN nanomaterials (Ph-BN) were used to reinforce the electrodeposited Ni W coatings. Compared with the h-BN nanomaterial, Ph-BN has better dispersion in the plating solution, which can effectively improve the mechanical and corrosion resistance of the coating. Compared with the Ni W coating, the microhardness value of the Ni-W/Ph-BN coating (662.8 Hv) was increased by 33.47 % and the friction coefficient (0.382) was reduced by 41.86 %. This is due to the special ceramic composite layered structure of Ph-BN namely the combination of flexible unit PDA structure and rigid unit h-BN structure, which will synergistically hinder the shedding of the coating during the friction process and help to improve the wear resistance of the coating. The R ct value of Ni-W/Ph-BN is 34,500 Ω•cm 2 , which is 105.36 % higher compared to Ni W coating. Ni-W/Ph-BN also has the smallest corrosion rate (0.0465 mm•a −1 ), which is 45.74 % lower relative to Ni W coating. The uniformly dispersed Ph-BN nanosheets in the coating prolong the corrosion path for corrosive ions. Besides, the PDA has the effect of anchoring Fe 2+ / Fe 3+ , which will be beneficial for the composite coating corrosion resistance improvement.
✓ 已验证
产品关联
DOI
高影响因子
AIP Advances
·
2023
·Vol. 13
·期 12
·
IF 1.6
Liu Yuting,Chen Yiming,Liang Jianlin,Zhao Jianyuan,Li Kang,Zhao Weiwei
In this study, we explored the impact of ionic liquid gating on YBa 2 Cu 3 O 7−x superconductivity. We observed that direct contact of YBa 2 Cu 3 O 7−x and the ionic liquid N-diethyl-N-methyl-N-(2methoxyethyl)ammonium bis(trifluoromethanesulfonyl)imide (DEME-TFSI) results in irreversible electrochemical reactions, despite the application of a relatively low gate voltage at 220 K. Capping a thin layer of boron nitride (BN) on YBa 2 Cu 3 O 7−x enabled a reversible modulation of carrier density at 300 K. Benefiting from the higher ion mobility of ionic liquid at 300 K, this modification led to more than a one-time increase in carrier density, a 3-time improvement in voltage modulation efficiency, and a reversible tuning of the superconducting temperature. These findings suggest that using a BN capping layer holds promise for enhancing the stability and efficiency of devices using ionic liquid gating.
✓ 已验证
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2020
·
IF 4.469
Pengying Wan,Nie Zhao,Fugang Qi,Biao Zhang,Hailong Xiong,Heng Yuan,Bin Liao,Xiaoping Ouyang
A novel PDA-BN@f-Al 2 O 3 nanohybrid was synthesized by depositing Al 2 O 3 nanoparticles modified with γ -Aminopropyltriethoxysilane (KH550) on the surface of hexagonal boron-nitride (h-BN) sheets covered with polydopamine (PDA). Then, PDA-BN@f-Al 2 O 3 hybrids was dispersed in epoxy resin to prepare composite coating samples. Many characterizations revealed that the functionalized Al 2 O 3 successfully deposited on the surface of PDA-BN platelets and PDA-BN@f-Al 2 O 3 hybrids showed good dispersibility in the epoxy resin, and the interfacial adhesion between hybrids and epoxy matrix was improved. Furthermore, the effects of Al 2 O 3 , h-BN and various mixtures of PDA-BN@f-Al 2 O 3 hybrids at a low weight fraction of 1 % on the corrosion resistance of epoxy coating were studied by electrochemical measurement and salt spray test. The potentiodynamic polarization test revealed that PDA-BN@f-Al 2 O 3 hybrids have a corrosion inhibitive performance. Moreover, the coating resistance of PDA-BN@f-Al 2 O 3 (3:1)/epoxy was enhanced by three orders of magnitude compared with neat epoxy after 5 d immersion. This study provides a promising application prospect for the development of superior metal protective organic coatings.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
·
IF 4.495
Qianglong He,Shi Tian,Jingjing Xie,Cuili Xiang,Hao Wang,Weimin Wang,Zhengyi Fu
B 6.5 C-TiB 2 -SiC-BN composite ceramics were prepared by a novel solid-state reaction using TiCN, B, and Si as raw materials. The final products obtained by hot pressing at 1950 °C possessed a fine microstructure, homogeneous distribution, and excellent mechanical properties . The obtained bulk B 6.5 C-TiB 2 -SiC-BN composite ceramic shows a high relative density (98.8 %). The mechanical properties of the composites are anisotropic because of the orientation growth and structural characteristics of TiB 2 and h-BN grains. The values of hardness, bending strength , and fracture toughness measured along the hot-pressing direction were 19.6 GPa, 801 MPa, and 4.30 MPa m 1/2 , respectively, which were higher than those measured perpendicular to the hot-pressing direction. The formation of twin structures in B 6.5 C and SiC grains and the crack deflections induced by h-BN and TiB 2 grains are beneficial for improving the mechanical properties of these composites.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Zhihai Wu,Pan Wang,Jun Wu,Jiao Wei,Yanni Sun,Nengping Wang,Zhenfu Zhao
Recently, all-inorganic perovskite (CsPbX 3 (X = Cl, Br, I)) nanocrystals (NCs) have caused extensive attention due to their high photoluminescence quantum yield (PL QY), high color purity, and narrow full width at half maximum (FWHM). Although the excellent optical properties of perovskite NCs (PNCs) endow them good application prospects, their inherent instability severely limits the commercialization process. In this paper, highly-luminescence and ultra-stable phosphor were obtained by loading PNCs onto the surface of amino modified hexagonal boron-nitride (h-BN) white graphene (PNCs-BNWG), This structural design can effectively suppress the attenuation of photoluminescence (PL) intensity and enhance thermal stability, thereby realizing the high stability and brightness white LEDs. The synthesis process is simple and can be finished in a few minutes to ensure scalable production. Compared with bare PNCs, it can maintain excellent optical properties. The high PL QY and thermal stability mainly stem from the isolation effect that separates PNCs from each other on the surface of BNWG and their superior high transparency as well as thermal conductivity . In addition, multi-color inks are produced by dispersing PNCs-BNWG nanocomposites in PDMS to form a multicolor painting demonstrating high PL QY and wide color gamut.
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 3
·386
·
IF 4.034
Guohai Yang,Daqing Zhang,Cheng Wang,Hong Liu,Lulu Qu,Haitao Li
Residual antibiotics in water have become a primary source of water pollution due to their misuse. Recently, membranes, produced by layered nanomaterials such as graphene oxide (GO), boron nitride (BN) and transition metal dichalcogenides, have been used in water purification, desalination and molecule separation as they are energy saving and simple to operate. The performance of membranes is closely related to their structure and the properties of the nanomaterials used. In this work, BN nanosheets (BNNSs) and GO were used to fabricate a two-dimensional nanocomposite membrane in order to improve the membrane’s permeance. It should be mentioned that the corresponding equal mass of the pure GO membrane was almost impermeable for the antibiotic solution. Multi-walled carbon nanotubes (MWCNTs) were inserted into the GO layers to increase the interlayer spacing and adsorb more antibiotics from the water. The resultant MWCNTs/BNNSs/GO membranes showed improved permeance and stable sieving capability for the antibiotic and small species. Specifically, permeance reached 30.2 L m−2h−1bar−1, which was much higher than pure GO membrane and the antibiotic rejection was 96.1%.Keywords:graphene oxide;boron nitride nanosheets;high permeance and selectivity;filtration membrane
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 56
·35451-35459
·
IF 3.108
Man Du,Qiuwen Liu,Caijin Huang,Xiaoqing Qiu
We present a facile one-step synthesis of chemically stable and magnetic Co@BN core–shell nanoparticles. We found that Co@BN nanoparticles acted as excellent catalysts with high stability and magnetic recyclability for reduction of nitroarenes to aminoarenes under mild reaction conditions. The sample 13.6 wt% Co@BN showed the best catalytic activity for reduction of 4-nitrophenol (4-NP). In addition, a significant synergistic effect of the h-BN support was observed during the catalytic reaction by effectively adsorbing/concentrating and ionizing the reactant nitroaromatics. Moreover, the kinetics of the catalytic reaction were investigated at different reaction temperatures, 4-nitrophenol concentrations, sodium borohydride concentrations, metal loadings and catalyst amounts. The activation energy of the catalytic reduction of 4-nitrophenol for 13.6 wt% Co@BN was determined to be 102.93 kJ mol−1. This work provides a clear example of Co@BN core–shell nanoparticles as nanocatalysts.
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2024
·Vol. 14
·期 6
·771
·
IF 2.9
Xia Zhao,Jingfu Song,Jingyi Lin,Guoqing Wang,Gai Zhao
Micro-arc oxidation (MAO) coatings of aluminum alloy have great potential applications due to their high hardness and wear resistance. However, the micro-pores and defects formed in the discharge channels during the MAO process limit its application in the corrosion field. This study delves into the impact of h-BN nanoparticles into MAO coatings on their structure, corrosion resistance, phase composition, and tribological properties. The results show that the incorporation of h-BN particles reduces the porosity and surface roughness of the coating while enhancing its hardness and wear resistance. The best corrosion resistance is obtained at a concentration of 2 g/L h-BN. An analysis of worn surface morphology, corrosion resistance, and friction coefficient change was conducted to evaluate the performance of this coating. This method provides a new approach to enhance the surface hardness and wear resistance of aluminum alloys, which is significant for expanding the application of aluminum alloys in corrosion environments.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Qiuqi Zhang,Xiao You,Huiying Ouyang,Yuanhang Yang,Zhenzhong Xing,Haodong Gu,Li Tian,Qingliang Shan,Xiangyu Zhang,Jinshan Yang,Shaoming Dong
In this work, a high-performance electromagnetic wave (EMW) absorber is prepared by the in situ growth of BN and SiC into a self-assembled 3D graphene skeleton via chemical vapor infiltration (CVI). The porous conductive graphene network extends the transmission path of incident microwaves by multiple scattering, and the ceramic coating effectively improves the impedance matching degree. Notably, the EMW absorbing performance of 3D-rGO/BN/SiC can be regulated by the high-temperature oxidation in air. Compared to the original absorbers, after being oxidized at 600 °C for 4 h in air, the optimal RLmin of the composites drops to −47.1 dB and the broadest EAB reaches 11.96 GHz, which can be attributed to the enhanced impedance matching degree. The controllable fabrication of 3D-rGO/BN/SiC composites can provide a guideline for rational design and fabrication of high-performance EMW absorbing materials in practical applications under medium oxidizing temperature.
✓ 已验证
产品关联
DOI
高影响因子
VACUUM
·
2024
·
IF 3.8
Bomin Feng,Jun Chen,Yifei Yang,Mao Yang,Hongbing Wang,Changyin Zhong,Yawei Hao,Jinhua Yang,Jian Jiao,Yunxi Yao
It is vital to understand the BN/SiC interface formation process. In this work, we choose 4H–SiC (0001) single crystalline surfaces as substrates to grow BN thin films by chemical vapor deposition with a borane-ammonia complex precursor. The chemical composition, surface morphology , and crystalline phase of the prepared BN/4H–SiC (0001) thin films were comprehensively characterized with XPS, Raman, AFM, SEM and TEM techniques. With the optimized preparation conditions, BN thin films with high crystallinity and low oxygen content (2.8 at%) can be fabricated. Three key factors of pretreatment of precursor, pyrolysis temperature, and post heat treatment have great effect on the growth of BN thin films. The successfully prepared BN/SiC (0001) thin films with the optimized growth conditions provide an ideal model system to study the influence of the various growth parameters on the quality of the BN thin films and the interface structures .
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）