APPLIED SURFACE SCIENCE
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2022
·
IF 7.392
Yang Li,Wenjing Wei,Jiaqi Chen,Lijie Zu,Yan Zhou,Jinzhu Wu,Xiaohong Wu
In spaceflight applications, molecular contamination control has become one of the most challenging issues. Porous zeolites are a potent molecular adsorbent with advantages of efficient adsorption at low pressure and/or high temperature, high interaction with adsorbates, and superior durability in extreme environments. Herein, zeolite 13X pellets were selected for adsorption of stearyl alcohol (C 18 H 37 OH) as a target molecular contaminant. Considering the excellent hydrophilicity of the zeolite 13X which limits the adsorption of most hydrophobic organic molecules, modification of the zeolite 13X by deposition of TiO 2 via atomic layer deposition (ALD) technology was performed. Results show that ALD-grown TiO 2 not only improves hydrophobicity but also renders high activity, whilst retains the hierarchical pores of the zeolites. As a result, the as-prepared zeolite 13X@TiO 2 exhibits efficient adsorption toward trace stearyl alcohol under low pressure through the synergistic contribution of physisorption and chemisorption. Monte Carlo (MC) simulation, molecular dynamic (MD) and Density Functional Theory (DFT) calculations further discover that pore wall surfaces are primary adsorption sites for the physisorption while ALD-grown TiO 2 provides active sites for the chemisorption.
研究领域:
材料科学
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空间科学
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DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 85
·81809-81813
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IF 3.289
Menghu Wang,Hang Ping,Hao Xie,Baoli Chen,Min Yan,Weijian Fang,Zhengyi Fu
A genetically modified bacterial surface not only serves as a confined environment for controlling the monodispersity of particle size, but also provides a carbon source in situ. The carbon coated SnO2 composite exhibits good lithium storage properties as an anode electrode, which are due to the ultrasmall size of the particles, the carbon coating and mesoporous structure.
研究领域:
材料科学
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能源存储
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DOI
高影响因子
Materials
·
2020
·Vol. 13
·期 6
·1333
·
IF 3.057
Xiangjin Guo,Zhaoliang Xing,Shiyi Zhao,Yingchao Cui,Guochang Li,Yanhui Wei,Qingquan Lei,Chuncheng Hao
This paper describes the effects of α-Al2O3nanosheets on the direct current voltage breakdown strength and space charge accumulation in crosslinked polyethylene/α-Al2O3nanocomposites. The α-Al2O3nanosheets with a uniform size and high aspect ratio were synthesized, surface-modified, and characterized. The α-Al2O3nanosheets were uniformly distributed into a crosslinked polyethylene matrix by mechanical blending and hot-press crosslinking. Direct current breakdown testing, electrical conductivity tests, and measurements of space charge indicated that the addition of α-Al2O3nanosheets introduced a large number of deep traps, blocked the charge injection, and decreased the charge carrier mobility, thereby significantly reducing the conductivity (from 3.25 × 10−13S/m to 1.04 × 10−13S/m), improving the direct current breakdown strength (from 220 to 320 kV/mm) and suppressing the space charge accumulation in the crosslinked polyethylene matrix. Besides, the results of direct current breakdown testing and electrical conductivity tests also showed that the surface modification of α-Al2O3nanosheets effectively improved the direct current breakdown strength and reduced the conductivity of crosslinked polyethylene/α-Al2O3nanocomposites.Keywords:XLPE/α-Al2O3nanocomposites;electrical properties;breakdown strength;electrical conductivity;space charge;pulsed electro-acoustic method
研究领域:
材料科学
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电气工程
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DOI
PubMed
高影响因子
Pharmaceuticals
·
2022
·Vol. 15
·期 11
·1394
·
IF 5.215
Tingting Li,Dong Han,Zhongxian Li,Mengqi Qiu,Yuting Zhu,Kai Li,Jiawei Xiang,Huizhen Sun,Yahong Shi,Tun Yan,Xiaoli Shi,Qiang Zhang
Idiopathic pulmonary fibrosis is a fatal interstitial disease characterized by fibroblast proliferation and differentiation and abnormal accumulation of extracellular matrix, with high mortality and an increasing annual incidence. Since few drugs are available for the treatment of pulmonary fibrosis, there is an urgent need for high-efficiency therapeutic drugs and treatment methods to reduce the mortality associated with pulmonary fibrosis. The interstitium, a highly efficient transportation system that pervades the body, plays an important role in the occurrence and development of disease, and can be used as a new route for disease diagnosis and treatment. In this study, we evaluated the administration of hydroxysafflor yellow A phytosomes via intervaginal space injection (ISI) as an anti-pulmonary fibrosis treatment. Our results show that this therapeutic strategy blocked the activation of p38 protein in the MAPK-p38 signaling pathway and inhibited the expression of Smad3 protein in the TGF-β/Smad signaling pathway, thereby reducing secretion of related inflammatory factors, deposition of collagen in the lungs of mice, and destruction of the alveolar structure. Use of ISI in the treatment of pulmonary fibrosis provides a potential novel therapeutic modality for the disease.Keywords:intervaginal space injection;pulmonary fibrosis;hydroxysafflor yellow A;phytosome;interstitial treatment
研究领域:
药理学
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肺科学
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分子生物学
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DOI
PubMed
高影响因子
CARBON
·
2022
·
IF 11.307
Yongqian Shen,Fan Zhang,Yuchen Zhang,Pengfei Song,Feng Gao,Dong Zhang,Chunli Liu,Jiqiang Ma,Huixia Feng,Xueyan Du
Advanced microwave absorbers (MAs) containing magnetic particles and carbon nanofibers (CNFs) have raised widespread attention in the rapid popularization of electronic communication equipment. However, it is quite challenging to control the growth of magnetic particles in CNFs to improve electromagnetic waves (EMWs) loss and attenuation. Herein, a novel space-confined strategy was adopted to develop Co/CoO/SiO 2 /CNFs, in which Co/CoO nanoparticles (NPs) with single domain size and dispersed distribution could achieve enhanced magnetic loss and dielectric loss. The introduction of nano-SiO 2 in the system could enhance the dielectric confinement effect of the nanofibers (NFs), while an interfacial confinement network could also be constructed to realize the refinement of Co/CoO NPs, enhance the electromagnetic (EM) loss, and ultimately ameliorate the microwave absorption performance of as-obtained NFs. When the additive amount of nano-SiO 2 in the spinning solution was 1.0 mg, the as-prepared Co/CoO/SiO 2 /CNFs reached the optimal reflection loss (RL) of −52.9 dB at 12.64 GHz with a thickness of 2.5 mm, and the effective bandwidth (EBW) reached 5.67 GHz (10.46–16.13 GHz). Furthermore, the excellent hydrophobic properties of the CNFs endow them with potential self-cleaning function. The confinement strategy proposed in this work lays a foundation for the design of low-filling ratio and high-performance CNFs-based microwave absorbers, and presents a general approach for the synthesis of one-dimensional composite materials with controllable structures.
研究领域:
材料科学
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电磁学
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DOI
高影响因子
XENOTRANSPLANTATION
·
2022
·Vol. 30
·期 1
·e12787
·
IF 3.788
Zhen Geng,Qi Zhang,Ting Li,Ting Huang,Hailian Wang,Qiao Zhou,Shaoping Deng,Yanshuang Zhao,Yanjiao Li,Chunming Cheng,Carmen Gonelle-Gispert,Leo H. Buhler,Yi Wang
Objective Islet allotransplantation has demonstrated improved clinical outcomes using the hepatic portal vein as the standard infusion method. However, the current implantation site is not ideal due to the short-term thrombotic and long-term immune destruction. Meanwhile, the shortage of human organ donors further limits its application. To find a new strategy, we tested a new polymer combination for islet encapsulation and transplantation. Meanwhile, we explored a new site for xenogeneic islet transplantation in mice. Method We synthesized a hydrogel combining alginate plus poly-ethylene-imine (Alg/PEI) for the encapsulation of rat, neonatal porcine, and human islets. Transplantation was performed into the retroperitoneal retro-colic space of diabetic mice. Control mice received free islets under the kidney capsule or encapsulated islets into the peritoneum. The biochemical indexes were measured, and the transplanted islets were harvested for immunohistochemical staining of insulin and glucagon. Results Mice receiving encapsulated rat, porcine and human islets transplanted into the retroperitoneal space maintained normoglycemia for a median of 275, 145.5, and 146 days, respectively. In contrast, encapsulated xenogeneic islets transplanted into the peritoneum, maintained function for a median of 61, 95.5, and 82 days, respectively. Meanwhile, xenogeneic islets transplanted free into the kidney capsule lost their function within 3 days after transplantation. Immunohistochemical staining of encapsulated rat, porcine and human islets, retrieved from the retroperitoneal space, allowed to distinguish morphological normal insulin expressing β- and glucagon expressing α-cells at 70, 60, and 100 days post-transplant, respectively. Conclusion Transplantation of Alg/PEI encapsulated xenogeneic islets into the retroperitoneal space provides a valuable new implantation strategy for the treatment of type 1 diabetes.
研究领域:
移植学
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糖尿病
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生物材料
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免疫学
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DOI
PubMed
高影响因子
Solar RRL
·
2023
·Vol. 7
·期 7
·2201093
·
IF 7.9
Xiaohong Ma,Danyang Li,Jun Xie,Jian Qi,Huacheng Jin,Liuyang Bai,Hao Zhang,Feifei You,Fangli Yuan
The reduction of CO 2 to chemical fuel driven by solar energy can not only meet the growing demand for renewable energy, but also balance the carbon cycle in nature. However, the current photocatalysts have low CO 2 conversion due to their poor light capture ability, narrow light response range, and high recombination probability of photogenerated carriers. Herein, a heterogeneous photocatalyst of hollow structured ZnO/ZnS decorated with Pt nanoparticles is synthesized through the hydrothermal process and photodeposition method, showing excellent photocatalytic activity for CO 2 reduction in long-time stability and ≈100% CO selectivity, which can mainly contribute to natural enhanced light-capture ability of the hollow confined space due to multiple reflection and scattering of light in the cavity, thus improving separation efficiency of photogenerated charge carriers due to the type II junction constructed between ZnO and ZnS and the additional reaction active sites after decorating Pt nanoparticles in the surface of the hollow structure.
研究领域:
材料科学
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环境科学
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能源科学
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产品关联
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2023
·
IF 6.1
Yuye Li,Shuyun Meng,Na Dong,Ya Wei,Yuan Wang,Xia Li,Dong Liu,Tianyan You
Aflatoxin B1 (AFB1) contamination has received considerable attention for the serious harm it causes and its wide distribution. Hence, its efficient monitoring is of great importance. Herein, a space-confined electrochemical aptasensor for AFB1 detection is developed using a conductive hydrogel. Plasmonic gold nanoparticles (AuNPs) and methylene blue-embedded double-stranded DNA (MB-dsDNA) were integrated into the conductive Au-hydrogel by ultraviolet (UV) polymerization. Specific recognition of AFB1 by the aptamer released MB from MB-dsDNA in the matrix. The free DNA migrated to the outer layer due to electrostatic repulsion during the Au-hydrogel formation. The electrochemical aptasensor based on this Au-hydrogel offered a twofold enlarged oxidation current of MB (IMB) compared with that recorded in the homogeneous solution for AFB1 detection. Upon light illumination, this IMB was further enlarged by the local surface plasmon resonance (LSPR) of the AuNPs. Ultimately, the Au-hydrogel-based electrochemical aptasensor provided a detection limit of 0.0008 ng mL–1 and a linear range of 0.001–1000 ng mL–1 under illumination for AFB1 detection. The Au-hydrogel allowed for space-confined aptasensing, favorable conductivity, and LSPR enhancement for better sensitivity. It significantly enhanced the applicability of the electrochemical aptasensor by avoiding complicated electrode fabrication and signal loss in a bulk homogeneous solution.
研究领域:
分析化学
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纳米技术
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食品安全
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生物技术
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Zhechen Fan,Maogen Zhu,Yuting Fang,Kaiwen Qi,Kangli Xu,Weiwei Wang,Qianyao Wu,Yongchun Zhu
Lithium metal anodes suffer from enormous mechanical stress derived from volume changes during electrochemical plating and stripping. The utilization of derived stress has the potential for the dendrite-free deposition and electrochemical reversibility of lithium metal. Here, we investigated the plating and stripping process of lithium metal held within a cellular three-dimensional graphene skeleton decorated with homogeneous Ag nanoparticles. Owing to appropriate reduction-splitting and electrostatic interaction of nitrogen dopants, the cellular skeletons show micron-level pores and superior elastic property. As lithium hosts, the cellular skeletons can physically confine the metal deposition and provide continuous volume-derived stress between Li and collectors, thus meliorating the stress-regulated Li morphology and improving the reversibility of Li metal anodes. Consequently, the symmetrical batteries exhibit a stable cycling performance with a span life of more than 1900 h. Full batteries (NCM811 as cathodes) achieve a reversible capacity of 181 mA h g–1 at 0.5 C and a stable cycling performance of 300 cycles with a capacity retention of 83.5%. The meliorative behavior of lithium metal within the cellular skeletons suggests the advantage of a stress-regulating strategy, which could also be meaningful for other conversion electrodes with volume fluctuation.
研究领域:
材料科学
·
电化学
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DOI
PubMed
高影响因子
Materials Today Physics
·
2023
·
IF 11.5
Rahul A. Rajan,Huang Tao,Weili Yu,Jianjun Yang
Femtosecond laser processing of lead halide perovskites has recently sparked wide popularity for creating various micro/nanostructures and instigating interesting properties. However, it is still lacking detailed insights into correlating the laser induced morphology and defect chemistry of perovskite materials to their light emitting properties. Here, the space-resolved photoluminescence and lasing behaviors are investigated for both the single crystal (SC) and polycrystalline (PC) perovskites upon femtosecond laser ablation . In the case of SC sample, three different regions based on the laser ablation , recast deposition, and modification respectively exhibits distinguished carrier recombination mechanisms due to their variable defect chemistries and morphologies identified, which helps to realize the amplified spontaneous emission with the recrystallized micro/nanostructures. On the other hand, the laser modified region on the PC sample reveals the significant enhancement of random lasing performance (the lasing threshold was reduced by ∼7 times and the slope efficiency increased by ∼1.5 times), which is attributed to the femtosecond laser induced non-radiative defect passivation and the average crystalline grain size reduction by more than 1.5 times. This study unveils the physical and chemical modification effects of the femtosecond laser irradiation on perovskite materials, and thus is an optimal strategy to fabricate desired perovskite light-emitting microstructures by ultrafast laser processing.
研究领域:
材料科学
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光学工程
·
物理化学
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产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 12
·7503-7513
·
IF 3.9
Mengmeng Zhu,Yunpeng Liu,Haojie Ding,Shulan Zhang,Mujing Qu,Tongtong Xuan,Huili Li
All-inorganic CsPbX 3 (X = Cl, Br, and I) perovskite nanocrystals (NCs) have great application prospects in many fields due to their excellent photoelectric properties. However, CsPbX 3 NCs are extremely sensitive to water, heat, light, and oxygen, which leads to dramatic photoluminescence quenching and seriously restricts their future commercial applications. Herein, a novel, simple one-step solution strategy for synthesizing high-quality CsPbBr 3 NCs was reported. By the combination of the hot-injection process with the mesoporous template confinement effect of the KIT-6 matrix, the space-confined growth of NCs was precisely achieved. The CsPbBr 3 NCs encapsulated by KIT-6 (CsPbBr 3 @KIT-6 composite) exhibited a uniform size, a high photoluminescence quantum yield (PLQY) of up to 82%, and a narrow full width at half-maximum (FWHM) of 24 nm. Most importantly, CsPbBr 3 @KIT-6 powder composites had dramatically enhanced light, thermal and water stability in comparison with colloidal CsPbBr 3 NCs due to the dual protection of organic ligands and matrix templates. Ultimately, a white light-emitting diode (LED) device was successfully fabricated by encapsulating a mixture of green-emitting CsPbBr 3 @KIT-6 composite and red-emitting K 2 SiF 6 :Mn 4+ phosphor onto a blue-emitting InGaN LED chip. A color coordinate of (0.327, 0.337) and a wide color gamut of 128% NTSC well demonstrate their potential applications in lighting and display.
研究领域:
材料科学
·
光学工程
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产品关联
DOI
高影响因子
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2024
·Vol. 121
·期 13
·e2321825121
·
IF 9.4
Yang Liu,Qiankun Chen,Hongli Zhang,Zeyu Feng,Gang Zou,Douguo Zhang
Label-free optical imaging of single-nanometer-scale matter is extremely important for a variety of biomedical, physical, and chemical investigations. One central challenge is that the background intensity is much stronger than the intensity of the scattering light from single nano-objects. Here, we propose an optical module comprising cascaded momentum-space polarization filters that can perform vector field modulation to block most of the background field and result in an almost black background; in contrast, only a small proportion of the scattering field is blocked, leading to obvious imaging contrast enhancement. This module can be installed in various optical microscopies to realize a black-field microscopy. Various single nano-objects with dimensions smaller than 20 nm appear distinctly in the black-field images. The chemical reactions occurring on single nanocrystals with edge lengths of approximately 10 nm are in situ real-time monitored by using the black-field microscopy. This label-free black-field microscopy is highly promising for a wide range of future multidisciplinary science applications.
研究领域:
生物医学
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物理学
·
化学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）