MOLECULES
·
2025
·Vol. 30
·期 8
·1709
·
IF 4.6
Junyong Chen,Defang Pan
The inherent brittleness of silica aerogels has hindered their application in thermal protection systems. To overcome this limitation, we developed a silica/polyimide composite aerogel with a bio-inspired “pomegranate-like” structure through in situ gelation. The strategic integration of polyimide nanofibers into the silica matrix created an interlocking network that immobilized silica particles, effectively resolving the mechanical fragility. By modulating the polyimide precursor (polyamic acid) concentration to 0.08 g/cm3through polyimide nanofiber reinforcement, the compressive strength reached 2.86 MPa—12 times greater than that of unmodified silica aerogel. The material demonstrated multifunctional performance: exceptional flame resistance (withstanding 1300 °C flame for 20 min with self-extinguishing behavior), high hydrophobicity (123° water contact angle), and ultralow thermal conductivity (0.035 W/(m·K)). This synergistic combination of tunable mechanics, thermal stability, and insulation properties positions the composite as an advanced solution for next-generation thermal protection materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER INTERNATIONAL
·
2011
·Vol. 60
·期 9
·1287-1290
·
IF 2.056
Qingquan Liu,Yingxiang Duan,Shaohua Shen,Zhihua Zhou
Pomegranate-like polystyrene-based microspheres with high porosity were successfully prepared via a simple route involving two steps. The first step was the preparation of polystyrene-based microspheres with multi-cores and a non-porous shell via suspension polymerization of divinylbenzene and vinylbenzyl chloride. Nitrogen sorption failed to characterize the pore structure of the microspheres because of the non-porous shell, but the results of Hg intrusion indicated that the pore volume of the microspheres was 0.36 cm 3 g −1 . The second step was post crosslinking of the microspheres derived from the first step. Extensive porosity was generated in the shell and the pomegranate-like structure of the microspheres remained almost unchanged. The results showed that the pore volumes of the final products derived from N 2 sorption and Hg intrusion were 0.54 cm 3 g −1 and 0.66 cm 3 g −1 , respectively. Overall, this provides a simple and feasible route to biomimetic preparation of pomegranate-like polystyrene-based microspheres with high porosity. Copyright © 2011 Society of Chemical Industry
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CARBON
·
2022
·
IF 11.307
Danping Tian,Miao Li,Xiaoting Hao,Yajuan Hao,Xiaoming Zhang,Hengquan Yang
Hierarchical carbon superstructures that built from primary nanoscale objects and featured with a micro- or macroscopic architecture are highly desired, as credited by the synergistically integrated specialties. Here, we present a simple “microconfined-assembly-locking” approach to achieve pomegranate-like mesoporous carbon microspheres (PMCMs), in which the Pickering droplet-confined colloidal particle assembly and surfactant-directed interfacial locking are coupled. The formed PMCMs possess a unique micro-nano-hierarchical structure that consisting numerous mesoporous hollow carbon nanospheres within a permeable crust. Benefitting from this hierarchical arrangement, such a peculiar architecture not only preserves high surface area, large pore volume and good accessibility of the nano-building blocks, but also upgrades in mechanical strength and easy handling ability. In addition, this strategy allows the interior microstructures to be manipulated through combinatorial varying the assembled colloidal particles and interfacial chemical locking processes. Notably, the PMCMs show superior sorption capacity and cyclability for organics or oils from water in a fixed-bed system, which could also be applied to enhance the catalytic performance in hydrogenation of aromatic compounds after loading with Ru nanoparticles . This synthetic method provides a powerful bridge between nanoscale objects and microscale patterning, and paves a way to access other novel superstructures for expanding their potential applications.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2021
·
IF 7.664
Yingying He,Huihong Xie,Shuai Li,Daogui Liao,Yanan Wang,Yunhua Chen,Li Zhou,Chuanbai Yu,Hongxia Liu
Rational design and construction on the microstructure of multifunctional microwave absorbing materials are significant strategy for upgrading their performances. Here, multifunctional hybrid foam with pomegranate-like microstructure are fabricated, which based on paraffin wax (PW)-in-water Pickering emulsion stabilized by cellulose nanofibrils (CNF). The in-situ polymerization of pyrrole monomer induced the creation of CNF/Fe 3 O 4 /PW/polypyrrole (PPy) hybrid foam, wherein PW microspheres were covered with CNF/Fe 3 O 4 /PPy nanocomposite shells. The obtained foam exhibited excellent microwave absorption performance with a reflection value (RL) of −55.6 dB and broadband bandwidth of 10.0 GHz (8.0–18.0 GHz). Owing to the specificity in the structure of hybrid foams with embedded PW microspheres, the maicrowave performance can be adjusted by regulating the amount of PW microspheres in composite foam. Moreover, pomegranate-like microwave-absorbing foams also show excellent photo-thermal conversion and energy storage, meaning this multifunctional composite foam has potential applications in microwave absorption, thermal energy storage systems, and smart buildings.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 48
·25746-25755
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IF 11.301
Jianhua Zhu,Jianwen Wang,Guanwu Li,Lu Huang,Mengyang Cao,Yingpeng Wu
The optimized design of size effects and interface effects can enhance the electron/Na-ion migration kinetics for energy-storage materials. Herein, small-size pomegranate-like Bi@C nanospheres (PBCNSs) are synthesized via a simple method and used as the anode of sodium-ion batteries. The composite has a hierarchical structure with ultra-small Bi nanoparticles embedded within carbon spheres which enable fast kinetics and efficient alleviation of stress/strain from the electrodes, and the conductive carbon matrix provides an interconnected electron transportation pathway. Moreover, the hierarchical structure can efficiently prevent the aggregation and pulverization of Bi nanoparticles. The PBCNSs anode delivers excellent sodium-storage performance with an outstanding rate performance (400.3 mA h g−1 at 0.2 A g−1, 372.8 mA h g−1 at 25 A g−1) and long-term cycle stability (340 mA h g−1 after 16 000 cycles at a high current density of 20 A g−1). More importantly, even at a high mass loading of 11.33 mg cm−2, a stable reversible capacity of 327.2 mA h g−1 can be obtained. The mechanism of the high performance was studied by electrochemical measurement and computer simulation.
研究领域:
材料科学
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电化学
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纳米技术
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产品关联
DOI
高影响因子
Nanoscale
·
2015
·Vol. 7
·期 8
·3719-3725
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IF 7.394
Xue Wang,Buyuan Guan,Yapeng He,Dong An,Ye Zhang,Yu Cao,Xiang Li,Yunling Liu,Qisheng Huo
Megranate-like nanoparticles possess a unique structure that is composed of multiple cores and shells, which is different from simple yolk–shell nanoparticles. Megranate-like nanoparticles can combine the properties of each component and be used as nanoreactors. This study describes the preparation of bifunctional megranate-like nanoreactors, consisting of multiple metal cores and thiol modified mesoporous SiO2 shells. Different metal nanoparticles (Pd, Pt, Au) can be incorporated into the structure as cores, and the thiol group in the shells can be oxidized to acidic –SO3H. The megranate-like nanoparticles show good bifunctional catalytic properties and recyclability in a cascade catalytic reaction for the desired benzimidazole derivative. Moreover, the individual components of the megranate-like nanoparticles also show good catalytic activities in the hydrogenation reduction of nitro-aromatics and the deprotection reaction of benzaldehyde dimethyl acetal.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale Research Letters
·
2018
·Vol. 13
·期 1
·1-8
·
IF 3.125
Wang Zhifeng,Zhang Xiaomin,Zhao Yan,Li Meixian,Tan Taizhe,Tan Minghui,Zhao Zeren,Ke Chengzhi,Qin Chunling,Chen Zhihong,Wang Yichao
Due to the severe volume expansion and poor cycle stability, transition metal oxide anode is still not meeting the commercial utilization. We herein demonstrate the synthetic method of core-shell pomegranate-shaped Fe 2 O 3 /C nano-composite via one-step hydrothermal process for the first time. The electrochemical performances were measured as anode material for Li-ion batteries. It exhibits excellent cycling performance, which sustains 705 mAh g −1 reversible capacities after 100 cycles at 100 mA g −1 . The anodes also showed good rate stability with discharge capacities of 480 mAh g −1 when cycling at a rate of 2000 mA g −1 . The excellent Li storage properties can be attributed to the unique core-shell pomegranate structure, which can not only ensure good electrical conductivity for active Fe 2 O 3 , but also accommodate huge volume change during cycles as well as facilitate the fast diffusion of Li ion.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Guoqiang Zhang,Zhiqi Wang,Tao He,Jingli Wu,Jinzhi Zhang,Jinhu Wu
Exploring efficient and robust CO 2 photoreduction and water splitting photocatalysts are critical for closing the anthropogenic carbon cycle and developing H 2 energy source. Herein, ultrasmall pomegranate-like Z-scheme CdIn 2 S 4 /ZnIn 2 S 4 heterojunctions with abundant vacancies were rationally designed and in-situ constructed though L-cysteine assisted solvothermal method with precipitation conversion strategy. The obtained CdIn 2 S 4 /ZnIn 2 S 4 -3 photocatalyst displays the highest performance in the photocatalytic conversion of CO 2 and H 2 O into CO and H 2 with yields of 1194.5 and 475.7 μmolg −1 h −1 , respectively, which increase respectively by 62.2% and 123.1% compared to CdIn 2 S 4 under the visible light irradiation. In addition, CdIn 2 S 4 /ZnIn 2 S 4 -4 hybrid exhibits excellent stability and activity during the 23-hour continuous HER, the average yield of H 2 in 23-hour is up to 10286.6 μmolg −1 h −1 . This study provides a practical method for in-situ fabrication of ultrasmall pomegranate-like Z-scheme nano-heterostructures with abundant vacancies, which are valuable for efficient and robust implementation in a wide range of environmental and energy applications.
研究领域:
材料科学
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环境科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
Micro & Nano Letters
·
2020
·Vol. 16
·期 1
·39-43
·
IF 0.975
Yawen Zhang,Yilu Bai,Lanlan Ye,Ting Li,Rui Chen,Hong Jin,Hongyan Xia,Hui Xu
In order to improve the rate performance and reduce the cost lithium ion anode, the Li 4 Ti 5 O 12 @TiO 2 (LTO-TO) was prepared by a facile hydrothermal reaction method with a micro-scale TiO 2 as the precursor. The morphologies and microstructures of the pomegranate-like LTO-TO were examined by scanning electron microscopy and transition electron microscopy. The results demonstrate that the nano-LTO particles are located on the surface of the micro TiO 2 . The electrochemical properties of the LTO-TO composites were characterized by galvanostatic charge/discharge. The as-prepared composites present a high capacity of 157.3 mAh g −1 at 0.5 C. Even at a high current density of 10 C, it can still maintain a high capacity of 105.4 mAh g −1 and remains 92.8% (95 mA g −1 ) after 450 cycles. These results indicate that the as-prepared LTO nano/micro-sphere may be a potential anode material for lithium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 43
·435410
·
IF 3.551
Q Chen,Y F Yuan,S M Yin,M Zhu,G S Cai
Pomegranate-like C@TiO2 mesoporous honeycomb spheres have been synthesized through two simple steps: formation of TiO2 mesoporous honeycomb spheres and the coating of polypyrrole followed by carbonization. TiO2 mesoporous honeycomb spheres are of large specific surface area of 153 m2 g−1 and contain abundant mesopores, which leads to high electrochemical activity and good kinetic performance of TiO2. A layer of amorphous carbon shell with the thickness of 30–40 nm tightly encapsulates a TiO2 mesoporous honeycomb sphere, forming a novel pomegranate-like small sphere, which significantly improves electronic conductivity and structural stability of TiO2. Benefiting from the unique pomegranate-like structure, C@TiO2 mesoporous honeycomb spheres exhibit high specific capacity, stable long-term cycling performance and good rate capability as an anode material for lithium ion batteries (LIBs). After 500 cycles at 1 C, the discharge capacity still reaches 184 mAh g−1. The electrochemical performance is superior to pure TiO2 mesoporous honeycomb spheres and most of the reported high-performance TiO2-based composites. This work provides a new high-performance TiO2-carbon-based composite material for LIBs as well as a new valuable research strategy.
研究领域:
材料科学
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电化学
·
能量存储
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2020
·
IF 7.216
Zi-Juan Wang,Mi-Xue Jin,Lu Zhang,Ai-Jun Wang,Jiu-Ju Feng
As a representative type of self-supported templates, cyano-bridged cyanogels provide ideal plateaus for synthesis of three-dimensional (3D) nanostructures. Herein, 3D pomegranate-like Fe-doped NiCo nanoassemblies (3D PG-NiCoFe NAs) were synthesized via facile one-step bi-component cyanogel reduction with NaBH 4 as the reducing agent. Specifically, the influence of the incorporated Fe amount was carefully investigated by finely adjusting the feeding molar ratios of the Ni/Co/Fe atoms in the precursors. By virtue of the unique structure and enriched oxygen vacancies originated from well-modulated electronic structures, the 3D PG-NiCoFe-211 NAs exhibited outstanding electrocatalytic performances for oxygen evolution reaction (OER) in alkaline solution, outperforming commercial RuO 2 catalyst. The current incorporation of foreign metal atom into host material provides some valuable insights into design and synthesis of metal-based nanocatalysts for constructing practical water splitting devices.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Bo-Tao Zhang,Qian Wang,Yang Zhang,Yanguo Teng,Maohong Fan
Carbon dots and nanomagnetites encapsulated in amorphous carbon spheres (CDs/Fe 3 O 4 @CS) with a pomegranate-like structure were synthesized via a solvothermal method and their peroxide activation performances for ibuprofen degradation were investigated in this work. The pomegranate-like nanocomposites, with an average diameter of 451.9 nm, possessed multicores and a 20–50 nm thick amorphous carbon shell. The multicores were composed of multiple 3.9–9.8 nm carbon dots and 5.6–18.6 nm nanomagnetites, as confirmed by X-ray diffraction, X-ray photoelectron, Raman and photoluminescence spectra. The Fe 3 O 4 loading was calculated to be 50.9 wt% according to thermo-gravimetric analysis. CDs/Fe 3 O 4 @CS had a specific surface area of 101.5 m 2 /g and the saturation magnetization of 26.8 emu/g. The CDs/Fe 3 O 4 @CS formation mechanism was proposed based on the characterization results. CDs/Fe 3 O 4 @CS exhibited high catalytic activities for peroxymonosulfate, persulfate and H 2 O 2 with and without visible light illumination, and persulfate showed higher ibuprofen degradation efficiencies. The amorphous carbon shell might benefit ibuprofen enrichment, the nano Fe 3 O 4 provided sufficient reactive sites to activate persulfate, and the CDs could accelerate the degradation due to their excellent electron donating and accepting abilities. The ibuprofen degradation in the CDs/Fe 3 O 4 @CS activated persulfate system followed a pseudo-first-order kinetic model and the activation energy was derived as 27.2 kJ/mol. The CDs/Fe 3 O 4 @CS also presented good reusability performances in the repeated experiments with visible light illumination. Singlet oxygen, hydroxyl and sulfate radicals were verified and the roles of these reactive species in ibuprofen degradation pathways were discussed based on intermediate analysis. The pomegranate-like nanocomposites might provide a potential promising catalyst for pollution control technologies.
研究领域:
环境科学
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材料科学
·
化学工程
✓ 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）