Nano-Micro Letters
·
2024
·Vol. 16
·期 1
·1-13
·
IF 31.6
Yu Huitao,Peng Lianqiang,Chen Can,Qin Mengmeng,Feng Wei
Vertically oriented carbon structures constructed from low-dimensional carbon materials are ideal frameworks for high-performance thermal interface materials (TIMs). However, improving the interfacial heat-transfer efficiency of vertically oriented carbon structures is a challenging task. Herein, an orthotropic three-dimensional (3D) hybrid carbon network (VSCG) is fabricated by depositing vertically aligned carbon nanotubes (VACNTs) on the surface of a horizontally oriented graphene film (HOGF). The interfacial interaction between the VACNTs and HOGF is then optimized through an annealing strategy. After regulating the orientation structure of the VACNTs and filling the VSCG with polydimethylsiloxane (PDMS), VSCG/PDMS composites with excellent 3D thermal conductive properties are obtained. The highest in-plane and through-plane thermal conductivities of the composites are 113.61 and 24.37 W m −1 K −1 , respectively. The high contact area of HOGF and good compressibility of VACNTs imbue the VSCG/PDMS composite with low thermal resistance. In addition, the interfacial heat-transfer efficiency of VSCG/PDMS composite in the TIM performance was improved by 71.3% compared to that of a state-of-the-art thermal pad. This new structural design can potentially realize high-performance TIMs that meet the need for high thermal conductivity and low contact thermal resistance in interfacial heat-transfer processes.
研究领域:
材料科学
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热能工程
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Huagen Liang,Anhu Wang,Ruolin Cheng,Fu Chen,Palanisamy Kannan,Costas Molochas,Panagiotis Tsiakaras
The emerging photocatalytic production of hydrogen peroxide (H 2 O 2 ) using graphitic carbon nitride (g-C 3 N 4 ) has attracted a lot of attention for its potential applications in various fields. However, However, the catalytic activity of pure g-C 3 N 4 is still limited. Herein, Bi, K co-doped g-C 3 N 4 (Bi x K y -CN) was prepared by co-thermal polymerization of a mixture of potassium nitrate, bismuth nitrate, melamine, and urea. The obtained Bi 3.6 K 3 -CN composite possesses more negative conduction and valence band positions that can, to some extent, enhance photocatalytic performance by lowering the energy barrier of redox reactions and by enhancing electron absorption capacity. Additionally, the pyrolysis process of the potassium nitrate and bismuth nitrate has a considerable impact on the formation of the morphology of g-C 3 N 4 , generating a porous lamellar-structure with nitrogen defects, resulting in increased oxygen adsorption and utilization capacity. These synergistic effects enable Bi 3.6 K 3 -CN to exhibit excellent photocatalytic activity and cycling stability for H 2 O 2 production. After 3 hours of visible light irradiation, the production of H 2 O 2 catalyzed by Bi 3.6 K 3 -CN can reach 1207.72 μmol L -1 , which is 57 times higher than that of pure g-C 3 N 4 .
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Guangfu Yi,Ke Zhang,Sha Kang
The construction of hybrid catalysts is an effective method to enhance catalytic performance, but research on the positioning of the load is limited. In this study, we synthesized two photocatalytic materials by controlling the bismuth-titanium ratio and the site value of Bi modification in the catalyst. The surface-modified photocatalyst, namely 1:0.9 Bi/TiO 2 , exhibits a photocatalytic efficiency of 68.9 % for the abatement of ppb-level NO in the presence of visible irradiation. This efficiency was significantly superior to that of the corresponding one-step synthesized Bi/TiO 2 (48.7 %) and the TiO 2 (18.6 %). Furthermore, it promotes nitrate formation and suppresses the generation of toxic NO 2 . Capture experiments indicate that the same active species are involved in both surface-loaded and uniformly loaded catalysts. The differences in their performance can be attributed to the higher vacancy concentration in the surface-loaded catalysts and the different local coordination environments of vacancies in the catalysts, altering the adsorption capability of oxygen molecules. This work offers fresh perspectives for the generation of efficient photocatalysts.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jiahao Lu,Ruiying Zhai,Yijie Yang,Sisi Chen,Xiaoqi Sun
Herein, a series of environmentally friendly rare earth doped yellow pigments with near-infrared (NIR) properties were synthesized using solid-state reaction at a high temperature of 1200 °C, with the general formula Y 2−x Bi x MoO 6 . The prepared pigments were characterized using analytical techniques, such as X-ray diffraction (XRD), scanning electron microscopy (SEM), CIE 1976 color space system, ultraviolet–visible/near infrared (UV–Vis/NIR) spectroscopy. Results indicated that its color changes from white to yellow after doping with Bi 2 O 3 in Y 2 MoO 6 . As the doping amount of Bi increased, the yellow color gradually deepened. All the doped samples exhibited a monoclinic structure with space group C 2/ c (15). When the optimal doping ratio was Y 1.8 Bi 0.2 MoO 6 (i.e., x = 0.2), the NIR reflectance (R%) and NIR solar reflectance (R∗%) of the pigment sample both exceeded 100 %. In the study of acid and alkali resistance, the color difference value ΔE∗ before and after pigment soaking was less than 5, indicating good chemical stability. In the coating study, the temperature difference between the air inside the pigment-coated house model and the air inside the uncoated house model reached 7 °C after 20 min of irradiation using an infrared lamp, suggesting that the prepared pigment reflects solar thermal radiation well and demonstrates good thermal insulation performance.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Meimei Yu,Xiwei Ji,Fen Ran
Macromolecular polymer hydrogels used in flexible supercapacitors and batteries have attracted extensive attention in recent years. In this paper, we use a simple polymer interpenetrating technology involving covalent cross-linking and non-covalent cross-linking aspects based on polyvinyl alcohol and carboxylated chitosan to prepare a flexible polymer hydrogel membrane for supercapacitor. The obtained hydrogel membrane has good flexibility and high ionic conductivity of 2.561×10 −2 s·cm -1 . The hydrogel electrode membrane prepared by in-situ polymerization of aniline exhibits an area specific capacitance of 580 mF·cm −2 at a current density of 0.5 mA·cm −2 . And the symmetric all-gel-state supercapacitor with hydrogel membrane as the gel electrolyte shows a high specific capacitance of 325 mF·cm −2 at 1.0 mA·cm −2 . We believe that this hydrogel film has considerable application prospects in flexible wearable electronic devices.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF BIOMATERIALS APPLICATIONS
·
2023
·
IF 2.9
Lihua Guan,Huijing Zhao,Kai Wang,Ke-qin Zhang,Kai Meng
Compliance mismatch between the artificial blood vessel and the host vessel leads to abnormal hemodynamics and is a major mechanical trigger of intimal hyperplasia. Efforts have been made to achieve higher compliance of artificial blood vessels. However, the preparation of artificial blood vessels with compliance matching to host vessels has not been realized. A bi-layered artificial blood vessel was successfully prepared by dip-coating and electrospinning composite method using poly(L-Lactide-co-caprolactone) (PLCL) and thermoplastic poly(ether urethane) (TPU). In the case of a certain wall thickness (200 μm), thickness ratios of the PLCL inner layer (dip-coating method) and TPU outer layer (electrospinning method) were controlled at 0:1, 1:9, 3:7, 5:5, 7:3, and 1:0 respectively and the compliance, radial tensile properties, burst pressure, and suture retention strength were investigated. Results showed compliance value of the artificial blood vessel decreased with the increase of the thickness ratio, which suggested the compliance of the bi-layered artificial blood vessel can be regulated by adjusting the ratio of the inner and outer layer thicknesses. In the six different artificial blood vessels, the one with thickness ratio of 1:9 not only had high compliance (8.768 ± 0.393%/100 mmHg) but also can guarantee the other mechanical properties, such as the radial breaking strength (6.333 ± 0.689 N/mm), burst pressure (534.473 ± 20.899 mmHg), and suture retention strength (300.773 ± 9.351 cN). The proposed artificial blood vessel preparation method is expected to achieve compliance matching with the host vessel. It is beneficial for eliminating abnormal hemodynamics and reducing intimal hyperplasia.
研究领域:
生物医学工程
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材料科学
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心血管外科
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Wang-Wei Liao,Lei Yang,Jie Chen,Da-Li Zhou,Xian-lin Qu,Kun Zheng,Guang Han,Jia-Bei Zhou,Min Hong,Zhi-Gang Chen
Copper selenide (Cu 2 Se) has been extensively studied as an eco-friendly thermoelectric candidate owing to the outstanding thermoelectric performance of its high-temperature β-phase. In this study, we propose that α-Cu 2 Se is also a promising thermoelectric material at near-room-temperature. We synthesize nanostructured Cu 2-x Se via a facile solvothermal method, and densify the samples using Spark Plasma Sintering to maintain the small grain sizes. Although the as-prepared α-Cu 2 Se has intrinsically low lattice thermal conductivity , its high Cu deficiency leads to a high carrier concentration, therefore, a low thermoelectric performance. As an electron donor, bismuth can effectively compress the Cu vacancies of the as-prepared α-Cu 2 Se and in turn reduce its carrier concentration from 4.1 × 10 20 to 2.0 × 10 20 cm −3 at room temperature, achieving a significantly enhanced power factor and a reduced carrier thermal conductivity. Consequently, a zT of 0.43 at 373 K is obtained in Cu 1.982 Bi 0.006 Se, showing great potential in developing high-performance near-room-temperature α-Cu 2 Se-based thermoelectric materials.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 46
·期 8
·3588-3594
·
IF 3.591
Qingqing Gao,Qian Lei,Ruoyan Miao,Manyi Gao,Hu Liu,Qin Yang,Yequn Liu,Fang Song,Yongsheng Yu,Weiwei Yang
Polymeric carbon nitride (PCN) is an emerging metal-free photocatalyst with high stability but is plagued by low photocatalytic efficiency due to the rapid charge carrier recombination behavior. Herein, Bi-doped graphitic carbon nitride nanotubes (BCN nanotubes) with a porous structure have been facilely prepared by one-step thermal polymerization of mixtures of melamine, urea and bismuth nitrate pentahydrate under an Ar atmosphere. With unique structural advantages for charge carrier transfer, light harvesting, and large surface area, the as-prepared BCN nanotubes exhibit excellent photocatalytic activity for the degradation of Rhodamine (Rh) B with a 26.8-fold higher reaction rate than that of PCN under visible light irradiation. This work provides informative principles about the synthesis of PCN with controlled morphology and element doping simultaneously for the photocatalytic degradation of chemical pollutants.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
LANGMUIR
·
2022
·
IF 4.331
Xiaolei Zhang,Bin Liu,Shu Yao,Zongming Liu,Jinkai Li
Photothermal therapy (PTT) has attracted great attention as an anticancer treatment strategy. With the rapid development of nanomedicine, multifunctional inorganic nanophotothermal agents provide a new way to improve the effect of PTT. Herein, bovine serum albumin (BSA)-modified Bi nanosheets (Bi NSs) with good biocompatibility were synthesized by a facile redox and ball milling method and applied as a photothermal agent for the enhancement of PTT. Owing to the strong near-infrared absorption, Bi NSs exhibit high photothermal conversion efficiency (η = 36.17%) under 808 nm laser irradiation and can serve as a nanotherapeutic agent for cancer therapy. In addition, in vitro cell safety analysis also suggests that the toxicity of BSA-modified Bi NSs is negligible. Upon 808 nm irradiation, the uptake ability of tumor cells to Bi NSs@BSA has been improved. Moreover, Bi NSs@BSA also can be used as a good contrast agent for CT imaging and then to observe the distribution of materials in the tumor site. Finally, Bi NSs@BSA-mediated PTT results show a high ablation rate of A549 tumor cells both in vitro and in vivo. All results reveal that Bi NSs@BSA is a promising nanotherapeutic platform for PTT.
研究领域:
纳米医学
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癌症治疗
·
生物材料
✓ 已验证
DOI
PubMed
高影响因子
Small Methods
·
2024
·
IF 10.7
Lu Hou,Wen-Cui Li,Sijia Wang,An-Hui Lu
Ringy nanostructures are amazing materials, displaying unique optical, magnetic, and electronic properties highly related to their dimensions. A strategy capable of continuously tailoring the diameter of nanorings is the key to elucidating their structure-function relationship. Herein, a method of bi-component micellar-configuration-transformation induced by hydrophobicity for the synthesis of nanorings with diameters ranging from submicron (≈143 nm) to micron (≈4.8 µm) and their carbonaceous analogs is established. Remarkably, the nanorings fabricated with this liquid phase strategy achieve the record for the largest diameter span. Through varying the molecular lengths of fatty alcohols and copolymers, shortening the molecular length of fatty alcohol can swell the primary micelles, improve the exposure of hydrophobic component and boost the assembly kinetics for ultra-large nanorings is shown here. On the other hand, shortening the molecular length of the copolymer will give rise to ultra-small nanorings by reducing the size of primary micelles and shortening the assembly time. When assembling the nanorings into monolayer arrays and then depositing Au, such substrate displays enhanced surface-enhanced Raman scattering (SERS) performance. This research develops a facile method for the controllable synthesis of ringy materials with multiscale tunable diameters and may inspire more interesting applications in physics, optical, and sensors.
研究领域:
材料科学
·
化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Nano
·
2025
·
IF 16
Chuang Shen,Xianghong Niu,Jiaxu Zhang,Shengheng Wang,Jianwei Chen,Fei Xu,Yefan Duan,Ying Zhang,Lixing Weng,Zhimin Luo,Lianhui Wang
Radiotherapy (RT) often has poor clinical sensitivity and tumor metastasis inhibition due to weak X-ray absorption, low energy deposition, inefficient reactive oxygen species (ROS) generation, and induction of antitumor immune response. Here, we report an ultrasmall Bi@Au Schottky heterojunction, namely, Bi@Au nanodots (Bi@Au NDs), to enhance the sensitivity of RT and activate systemic immunity for effective tumor treatment and metastasis inhibition. Bi@Au NDs exhibit a high efficiency of ROS generation and glutathione (GSH) depletion. Density functional theory calculations reveal that Bi@Au NDs with a high Schottky potential barrier can efficiently facilitate carrier separation and prevent carrier backflow, which results in abundant electrons for catalytically decomposing H2O2 to •OH under X-ray irradiation. Experimental results in vitro and in vivo show that Bi@Au NDs can significantly sensitize RT by enhancing ROS generation and GSH depletion. Bi@Au ND-sensitized RT greatly induces immunogenic cell death and thus promotes a CD8+ T cell-mediated systemic immune response, ultimately inhibiting tumor metastasis. Bi@Au NDs as a kind of Schottky heterojunctions can be an effective amplifier for radioimmunotherapy.
研究领域:
生物医学工程
·
肿瘤学
·
放射生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2026
·
IF 4.4
Zhiyuan Chen,Bingbing Shao,Chao Liang,Yiwen Zhang,Yunpu Zhai,Yonggang Liu
Bi-HOF/g-C 3 N 4 direct Z-scheme heterojunction was constructed. • Bi N/Bi O bonds enhanced interfacial charge transfer. • BHG-3 achieved 97.26% MB removal under visible light. • ·O 2 − and h + were identified as dominant active species. • BHG-3 showed good stability and broad pollutant applicability. To integrate the visible-light-harvesting capability of g-C 3 N 4 with the interfacial electron-transfer function of hydrogen-bonded organic frameworks (HOFs), a Bi-HOF/g-C 3 N 4 (BHG) direct Z -scheme heterojunction was constructed via a facile hydrothermal assembly strategy. Structural and surface chemical characterizations confirmed the successful formation of the heterojunction, where strong interfacial coupling was established through Bi–N/Bi–O coordination bonds and hydrogen-bonding interactions. Photoelectrochemical and spectroscopic analyses revealed that the BHG heterojunction markedly promoted charge separation and migration, as evidenced by an enhanced photocurrent response, reduced interfacial charge-transfer resistance, and suppressed recombination of photogenerated carriers. The optimized BHG-3 composite exhibited excellent visible-light photocatalytic activity, achieving 97.26% removal of methylene blue (MB) within 40 min, with an apparent reaction rate constant 3.39 times higher than that of pristine g-C 3 N 4 . Moreover, BHG-3 showed good cycling stability, favorable tolerance to selected coexisting inorganic anions and degradation capability toward several model organic contaminants. Radical trapping experiments and mechanistic analyses confirmed a direct Z -scheme charge-transfer pathway, in which electrons enriched on g-C 3 N 4 and holes retained on Bi-HOF synergistically participated in pollutant degradation. The possible photodegradation pathway of MB over BHG-3 was further proposed based on LC-MS analysis. This work provides insight into interfacial charge regulation in HOF-based photocatalysts and offers a feasible strategy for developing efficient visible-light-driven systems for organic pollutant degradation.
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DOI
高影响因子
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