CARBON
·
2016
·
IF 6.198
Chen Zhou,Sai Geng,Xiuwen Xu,Tihong Wang,Liqiang Zhang,Xiaojuan Tian,Fan Yang,Haitao Yang,Yongfeng Li
Hollow carbon nanospheres (HCNs) with tunable sizes have been successfully prepared by the calcination of hollow copolymer nanospheres. Our findings indicate that compared to the counterpart solid carbon particle , HCNs all achieve substantially enhanced microwave absorption, suggesting that hollow structure plays an important role during microwave absorption. Moreover, further investigation on the effect of different HCNs sizes upon microwave absorption has been conducted. It is found that HCNs with an outer diameter of ∼70 nm and inner diameter of ∼30 nm exhibit the champion EM absorption performance , a minimum reflection loss (RL) of −50.8 dB at 13.5 GHz with a thickness of 1.9 mm, along with the corresponding bandwidth of RL less than −10 dB (90% absorption) covering 4.8 GHz. Notably, such excellent microwave absorption performance, probably as a result of well-matched impedance together with multiple reflection induced by the distinctive hollow structure, demonstrates HCNs to be one of the most competitive carbon-based absorbers to date. More importantly, this study provides an effective strategy to tune the microwave performance via tailoring the sizes of HCNs.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Guiyan Yang,Ruihua Guan,Hengyu Zhen,Kangtai Ou,Jiang Fang,Dian-sen Li,Qiang Fu,Youyi Sun
A new three-dimensional (3D) printing gel is developed to construct hierarchically porous ceramics with adjustable millimeter-, micrometer-, and nanometer-scale size for application in thermal management. Not only does the gel based on supramolecular micelles exhibit excellent DIW 3D printability but also the supramolecular micelles act as templates that can precisely control the structure of micrometer-scale pores. The effect of millimeter- and μmicrometer-scale size on properties of porous ceramics is investigated in detail. The 3D-printed ceramic foam with millimeter-scale pores and smaller micrometer-scale pores shows better thermal insulation and lower compressive strength. For the thermal insulation, the local temperature of a chip exposed to contact heat is only 34.2 °C in the presence of a printed foam cap with a pore size of 41.5 μm, while the local temperature is 54.8 °C in the absence of the printed foam cap. The study provides a new method to construct hierarchically porous alumina ceramics with precisely tunable size, avoiding the issues of subtractive manufacturing and opening up new applications in portable devices or consumer electronics.
研究领域:
材料科学
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纳米技术
·
先进制造
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Chunjie Liu,Jing Wang,Hua Huang,Luyang Li,Liang Chen,Haiyan Zhang
Separation materials have focused on porous particles with a microporous structure and a large specific surface area. However, for specific separation processes such as biomacromolecules, cell fermentation liquid, or high viscosity liquids, large pores can substantially reduce mass transfer resistance and enhance mass transfer efficiency. Therefore, a more detailed investigation is required to develop a simple method for obtaining super-macroporous particles. In this work, we presented a strategy that combined gas-shearing and sulfolane freeze casting to obtain poly (methyl methacrylate) (PMMA)-based cryogel particles with a tunable size (476–1873 μm) and polarity (contact angle of 135°–0°). The cryogel particles had a micron-scale porous structure (16.8–46.8 μm), and the volume shrinkage effect during sulfolane crystallization formed unique surface single pores (93.7–294.6 μm) and an internal hollow structure (218.4–615.6 μm). Cryogel particles with high porosity (>75 %) and good hydrophobicity had a high absorption capacity for organic solvents and oils (>15 g g −1 ). Meanwhile, the cryogel particles exhibited a column effect that was 1.3–3.9 times greater than that of the macroporous resin, along with superior adsorption kinetics. This study provides a novel strategy for obtaining super-macroporous particles with tunable particle size and composition, achieving efficient separation in special systems.
研究领域:
生物分离工程
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材料科学
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化学工程
·
高分子材料
·
吸附分离技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2018
·Vol. 6
·期 16
·2426-2431
·
IF 4.776
Zhen Wang,Pei Dong,Zhongxiong Sun,Ce Sun,Huaiyu Bu,Jing Han,Sanping Chen,Gang Xie
Here we report a general approach for synthesizing size/morphology-controlled NH2-Ni-MOFs by optimizing the solvent composition in the reaction system, and their correlating catalytic performances are clearly explored for the first time. Interestingly, the electrocatalytic performance was found to increase 2.7 fold when the particle size is reduced from 1.5 μm for NH2-Ni-MOF(a) to 300 nm for NH2-Ni-MOF(c). Subsequently, this work exhibits an example of a high-performance NH2-Ni-MOF(c) electrocatalyst for application in constructing an electrochemical aptasensor to achieve sensitive C-reactive protein (CRP) detection based on an aptamer binding induced DNA walker–antibody sandwich assay. The proposed aptasensor shows a wide linear range from 0.1 pg mL−1 to 100 ng mL−1 with a low detection limit of 0.029 pg mL−1. The work presented here can thus offer an atypical approach to size- and morphology-controlled MOFs in electrocatalysis and biosensing.
研究领域:
电化学
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生物传感
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材料科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
CARBON
·
2021
·
IF 9.594
Chuyi Han,Xianming Zhang,Fan Wang,Qinghua Yu,Feng Chen,Di Shen,Zhangyou Yang,Tingting Wang,Mingyue Jiang,Tao Deng,Chao Yu
Carbon quantum dots (CQDs) are extensively applied for bioimaging due to their unique photoluminescence properties, while less attention has been paid to their inherent bio-functions as targeted drug delivery vehicles. To address this limitation, a novel CQDs-based drug delivery system ( [email protected] ) was constructed using l -arginine as precursor with duplex metal co-doping (Ag&Cu) for further DOX-loading/releasing and synergistic tumor theranostics. Specifically, the functional residues retention ability of CQDs guaranteed the reactive nitrogen species (RNS) replenishment, Ag-doping enhanced the photoluminescence intensity, and Cu 2+ -functionalizing could act as the anchor for further interparticle self-assembly, resulting in intelligent adjustable CQDs size for increasing the drug-loading capacity. After reaching targeted sites, CQDs could act as NO/ONOO − donors for gas-involving therapy, and Cu 2+ could not only generate ROS through chemodynamic therapy (CDT), but also modulate the band structure of as-prepared CQDs for laser-induced photodynamic therapy (PDT) to further replenishing ROS. Simultaneously, with Cu 2+ depletion, the structure of [email protected] was disrupted, which guaranteed in situ DOX-releasing. As such, these orchestrated procedures fully exerted the intrinsic bio-functions of CQDs then act as adjuvants in drug delivery systems, thus representing synergistic effects in suppressing tumor progression and migration with minimal side effects, and provides a paradigm of potent CQDs-based nanotheranostics.
研究领域:
纳米技术
·
生物医学工程
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癌症研究
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药学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-12
·
IF 16.6
Zheng Jiapeng,Boukouvala Christina,Lewis George R.,Ma Yicong,Chen Yang,Ringe Emilie,Shao Lei,Huang Zhifeng,Wang Jianfang
Enriching the library of chiral plasmonic nanoparticles that can be chemically mass-produced will greatly facilitate the applications of chiral plasmonics in areas ranging from constructing optical metamaterials to sensing chiral molecules and activating immune cells. Here we report on a halide-assisted differential growth strategy that can direct the anisotropic growth of chiral Au nanoparticles with tunable sizes and diverse morphologies. Anisotropic Au nanodisks are employed as seeds to yield triskelion-shaped chiral nanoparticles with threefold rotational symmetry and high dissymmetry factors. The averaged scattering g -factors of the l - and d -nanotriskelions are as large as 0.57 and − 0.49 at 650 nm, respectively. The Au nanotriskelions have been applied in chiral optical switching devices and chiral nanoemitters. We also demonstrate that the manipulation of the directional growth rate enables the generation of a variety of chiral morphologies in the presence of homochiral ligands.
研究领域:
纳米技术
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材料科学
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光学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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