Nano Energy
·
2019
·
IF 15.548
Yanyan Zheng,Chengyan Liu,Lei Miao,Chao Li,Rong Huang,Jie Gao,Xiaoyang Wang,Junliang Chen,Yanchun Zhou,Eiji Nishibori
MgAgSb-based materials are ideal candidates for thermoelectric applications due to several advantages, such as rich elements, low cost and excellent mechanical robustness. Recently, the all-scale hierarchical architecture and strong anharmonicity in bonding are realized as effective strategies to reduce the lattice thermal conductivity greatly. Here, a design of the all-scale hierarchical architectures, in which the phonon is scattered by the high density of grain boundaries, dislocation, stacking faults, twin boundaries and nanopores , and enhancement of Grüneisen parameter have been demonstrated in reducing the lattice thermal conductivity of MgAgSb materials in the whole temperature range, resulting in an ultralow lattice thermal conductivity ∼ 0.45 W m −1 K −1 at 473 K. Furthermore, the carrier concentration and mobility are also optimized by Zn-doping and heat-treating. The simultaneous optimization of electrical and thermal transport properties contributes to a tremendous enhancement of average ZT to about 1.3 in the range from 323 K to 548 K (the maximum ZT is about 1.4 at 423 K) in the sample Mg 0.97 Zn 0.03 Ag 0.9 Sb 0.95 with heat-treating for 10 days. The method we designed not only boosts the thermoelectric application of MgAgSb-based materials but also enables a synergetic strategy for designing thermoelectric materials with high thermoelectric performance.
研究领域:
材料科学
·
热电学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 30
·18030-18038
·
IF 10.733
Chaoyun Tang,Hui Zhang,Kuofeng Xu,Qianling Zhang,Jianhong Liu,Chuanxin He,Liangdong Fan,Tewodros Asefa
The development of noble metal-free catalysts, which can replace noble metal ones, such as Pt, for various electrocatalytic processes in renewable energy devices is currently of huge interest. The β-phase of molybdenum carbide (i.e., β-Mo2C) has been reported to be one of the most active noble metal-free electrocatalysts for the hydrogen evolution reaction (HER) in electrolyzers, whereas the other phases, MoC and MoC1−x, have been widely regarded as weak electrocatalysts for HER. Herein, we report the synthesis of nanoporous substoichiometric α-MoC1−x and η-MoC nanosheets, named np-MoC NSs, that show comparable electrocatalytic activity toward HER as β-Mo2C does. The materials are synthesized using two-dimensional (2D) conjugated carbonitride and ammonium molybdate as precursors. Their structures contain N dopant atoms and nanopores. The pores create highly accessible catalytic sites and good mass and charge transport, and thereby excellent reaction kinetics for HER, in the materials. Theoretical calculations show that the N dopant atoms modulate the electronic properties of the catalytically active sites in the materials, leading to lower free energy of adsorption and desorption for the hydrogen species involved in the reaction and better catalytic activity for HER. This work demonstrates that, by simple structural design and electronic modulation, various phases of molybdenum carbides and related materials that have been traditionally considered inactive catalysts for HER can be made robust electrocatalysts for the reaction.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
DESALINATION
·
2019
·
IF 6.035
Zhao Zhang,Guodong Kang,Haijun Yu,Yan Jin,Yiming Cao
Membranes with suitable nanopores and tunable charge characteristics are highly desired for their good application prospects in specific membrane-based separations. This study focused on the synthesis of polyamide (PA) composite membranes with tunable pore size and perm-selectivity. Trimellitic anhydride chloride (TAC) with an anhydride group, was introduced as the co-reactant of trimesoyl chloride (TMC) to form PA film via interfacial polymerization with m -phenylenediamine on the surface of the polysulfone substrate membrane. Due to the chemistry character difference (the number of functional group and acylation activity) between TMC and TAC, the structure and physico-chemistry properties of the PA film could be tailored through the control of TAC concentration . As a result, the nanopore radius of the membrane varied from <0.32 to 1.14 nm, along with the improved water permeability from 2.3 to 9.8 L m −2 h −1 bar −1 and selectivity of Na 2 SO 4 /NaCl from 2.2 to 4.9. This study provided a facile and effective approach for the fabrication of tailor-made membrane with tunable nanopore and ion selectivity designed at a molecular level.
研究领域:
材料科学
·
分离技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Chemistry
·
2012
·
IF 0
Xiao Yan,Hai-Rong Pei,Tong-Bo Wang,Wen-Bo Liu,Xiao-Zheng Lan
Phase behavior of undecane-dodecane mixtures (n-C11H24-C12H26, C11-C12) in bulk and confined in SBA-15 (pore diameters 3.8, 7.8, and 17.2 nm) has been studied by differential scanning calorimetry. Phase diagram of the confined C11-C12 system shows dependence on pore size, indicating simple behavior compared with the bulk. In the three systems, melting points of the confined C11, C12 and the mixtures ( = 0.1–0.9) present a linear relation with the pore diameter from 3.8 to 17.2 nm. Melting behavior of the confined C11-C12 mixtures is closely as the confined C11, C12. Melting temperatures of the three systems have been fitted as a function of mole fraction .
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
DESALINATION
·
2022
·
IF 11.211
Miao Tian,Haiqing Hui,Tao Ma,Guanru Zhao,Mahmood Zarak,Xiaofei You,Wenlu Li
Nanofiltration (NF) membranes are important for the resource of the wastewater from the coal chemical industry, brackish water and seawater desalination , and other purification applications to overcome the shortage of fresh water. However, ordinary NF membranes are easily oxidized by the residual chlorine in the influent. Here, we report a phase transition of lysozyme nanofilm for tuning the nanopore and surface charge of commercial NF membranes by a one-step dip-coating method using a buffer solution mixed with lysozyme. The pore size and selectivity of the membrane can be tailored through the coating time. The nanofilm can protect the membrane as a sacrifice layer from the corrosion of sodium hypochlorite solution . X-ray photoelectron spectroscopy (XPS) results confirmed that the nanofilm disappeared after being oxidized by 1000 ppm NaClO for 30 h. Nanofilm can effectively keep the rejection rate of Na 2 SO 4 at ~96 %. Our work proves the potential use of nanofilm as a good post-treatment for regulating membrane pore structure and surface charge. The construction of the sacrificial layer, which has also been proven to be universal for other types of membranes, provides a new idea for the NF membrane to resist sodium hypochlorite oxidation .
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Yue Li,Feng-Qiang Xiong,Ruiling Ou,Lipeng Wan,Congling Yin,Ruxin Che,Minghui Yang
Highly crystalline (110) layered perovskite Sr 2 Nb 2 O 7 , (111) layered perovskite Sr 5 Nb 4 O 15 and complex perovskite Sr 4 Nb 2 O 9 were prepared by NaCl-KCl flux growth method from SrCO 3 and Nb 2 O 5 . This flux synthesis achieves single strontium niobate phase in contrast to mixed niobates from the solid state reaction with the same heating parameters. A little excess of Sr source was found to be required for the synthesis of Sr 5 Nb 4 O 15 and Sr 4 Nb 2 O 9 at elevated temperature due to slight evaporation. The three strontium niobates were converted to perovskite SrNbO 2 N via thermal ammonolysis under NH 3 flow at 900 °C. Post-wash treatment was performed to remove the byproduct SrO. This makes additional nanopores in SrNbO 2 N in the cases of Sr 5 Nb 4 O 15 and Sr 4 Nb 2 O 9 , and results in increasing surface areas of SrNbO 2 N with Sr:Nb ratios in the precursors (from 9.9 to 19.8 and 35.5 m 2 /g). On the other hand, the UV–Vis diffusion reflectance spectra reveal decreasing light absorption by defects in SrNbO 2 N in this order. This suggests fewer low-valent Nb defects in SrNbO 2 N prepared from precursor with higher Sr:Nb ratio. SrNbO 2 N prepared from Sr 4 Nb 2 O 9 would be advantageous for applications that require high surface area and low defect density of the material.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Na Ji,Hui-Qing Shi,Xiu-Yu Fang,Zhi-Yong Wu
Both human telomere and proto-oncogene c-MYC can form G-quadruplex (G4) with various conformations. Porphyrin derivative (TMPyP4) could stabilize G4, and thus is considered as a potential drug for anticancer therapeutics . In this paper, the translocation behaviors of three typical G4s (telomere basket, telomere hybrid-1 and c-MYC Pu22 parallel) and their interaction with TMPyP4 were investigated with a single protein nanopore sensing interface with the same main electrolyte of 0.5 M tetramethylammonium chloride. As observed by the statistics of the dwell time of the current pulses, in the presence of K + , the parallel G4 is more stable than the hybrid-1 G4, while the basket G4 in the presence of Na + exhibited shortest duration. The dwell time of all of the G4s increased as the result of interaction with TMPyP4, indicating an obvious stabilizing effect. This study demonstrated that the single nanopore sensing interface not only reveal the stability of various G4 conformations at a single-molecule level, but also provide the interaction information of a ligand, which could be useful in the drug design.
研究领域:
分子生物学
·
生物物理学
·
药物设计
✓ 已验证
DOI
PubMed
高影响因子
Nature Water
·
2023
·Vol. 1
·期 8
·725-735
·
IF 0
Lin Jiuyang,Ye Wenyuan,Xie Shuangling,Du Jiale,Liu Riri,Zou Dong,Chen Xiangyu,Yu Zijian,Fang Shengqiong,Ang Elisa Yun Mei,Toh William,Han Dan Dan,Ng Teng Yong,Seo Dong Han,Zhao Shuaifei,Van der Bruggen Bart,Xie Ming,Lee Young Moo
A key to sustainable management of saline organic-rich wastewaters is to precisely fractionate organic components and inorganic salts (NaCl) as individual resources. Conventional nanofiltration and electrodialysis processes suffer from membrane fouling and compromise the fractionation efficacy. Here we develop a thin-film composite nanoporous membrane via co-deposition of dopamine and polyethyleneimine as a highly anion-conducting membrane. Experimental results and molecular dynamics simulations show that co-deposition of dopamine and polyethyleneimine effectively tailors the membrane surface properties, intensifying the charge shielding effect and enabling fast anion transfer for highly efficient electrodialysis. The resulting nanoporous membrane exhibits unprecedented electrodialytic fractionation of organics and NaCl with negligible membrane fouling, dramatically outperforming state-of-the-art anion exchange membranes. Our study sheds light on facile design of high-performance anion-conducting membranes and associated new mass transport mechanisms in electrodialytic separation, paving the way for sustainable management of complex waste streams.
研究领域:
环境科学
·
膜技术
·
化学工程
✓ 已验证
DOI
ACS Nano
·
2025
·
IF 16
Hairui Huang,Hanyu Wu,Yizhou Zhang,Xunda Feng
Molecular-scale adsorption, catalysis, and separation demand nanoporous materials with high permeability, extensive surface areas, and pronounced nanoconfined effects. Fabricating polymeric particles with 3-D interwoven pores of ∼1 nm potentially addresses these needs. However, significant challenges remain in controlling their pore interconnectivity, uniformity, and achieving faceted particle shapes. Herein we present facile fabrication of polyhedral particles possessing interpenetrating 1 nm pores by suspension polymerization of double-gyroid (DG) liquid crystalline droplets. Mechanical stirring of the disordered phase at elevated temperatures, followed by undercooling, leads to the emulsification of DG droplets, as confirmed by synchrotron small-angle X-ray scattering (SAXS). UV-induced cross-linking of the DG droplets preserves the ordered network of 1 nm pores, as characterized by SAXS and microscopy. Intriguingly, due to the elasticity induced by the Ia3̅d periodicities, these particles adopt polyhedral shapes to avoid the elastic energy penalty associated with conventional sphericity. We demonstrate that these faceted particles, featuring 1 nm pores and efficient packing, enable rapid, size-exclusive adsorption and nanoconfined degradation of organic pollutants, driven by their 3-D permeability, high surface area, and enhanced nanoconfinement effects.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
TALANTA
·
2024
·
IF 5.6
Guodong Qi,Xun Chen,Daixin Liu,Meili Ren,Rong Tian,Liyuan Liang
Owing to the facile fabrication and surface modification, the cost-effective polymer nanopores are widely employed in unimolecular determination of biomacromolecules and selective sensing of small molecules, nanoparticles and biomarkers. However, the documented polymer nanochannels are generally microscale in length with low spatial resolution. We herein synthesized azobenzene side-chain polymer (Azo-PMA) and spin-coated on silicon nitride membrane to obtain a polymer film of nanoscale thickness for further nanopore generation via controlled dielectric breakdown (CDB) approach. The Azo-PMA nanopores demonstrate good ions transporting activities, pH tolerance and stability in high concentration of electrolyte with low ionic current noise. In addition, the azobenzene-containing polymer nanopores exhibit photo-response upon UV/Vis. light irradiation. The Azo-PMA nanopore devices are utilized for linear and quadruple nucleic acids discrimination, sensing of proteins with distinct shapes and sizes, as well as the single amino acid resolution with good capture rate and sensitivity. We established an unimolecular sensing platform using polymer nanopores for nucleic acids and proteins detection with good spatial resolution, which will be an addition for the nanopore-carrier material exploration and applications in potential genomics and proteomics with high spatiotemporal resolution and low cost.
研究领域:
生物物理学
·
纳米技术
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Scientific Reports
·
2024
·Vol. 14
·期 1
·1-9
·
IF 3.8
Sun Yunze,Mi Zhuang,Chen Xiaoyu,Li Jian-Jun,Lu Jun,Shan Xinyan,Lu Xinghua,Du Yuguang
Glycans, nucleic acids and proteins are three major classes of natural biopolymers. The extremely high diversity of isomerization makes structural elucidation of glycans the most challenging job among three classes. In the past few years, the single molecule sensing technique based on nanopores has achieved great success in sequencing of DNA. Inspired by this, it is potential to sequence glycans in the similar manner. Herein, SiN x nanopores were used to identify nine common monosaccharides in mammals. Each monosaccharide showed characteristic blockage current, which roughly increased with the increase of its molecular weight. In order to distinguish nine monosaccharides, several machine learning models were trained and tested, of which the highest F1 value was 1. These results illustrated that nine common monosaccharides in mammals could be clearly identified and discriminate by our method combining solid-state nanopores and machine learning. As far as we know, this is the first report that monosaccharides can be sensed and distinguished by solid-state nanopores. Our work showed the great potential of solid-state nanopores in glycan sequencing, and would lay the foundation for solid-state nanopore-based glycan sequencing.
研究领域:
生物化学
·
分子生物学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Jingjing Wang,Guotao Duan,Yue Li,Guangqiang Liu,Weiping Cai
A simple and facile strategy is presented to fabricate the metal nanodisk and nanohole arrays based on a wet etching-assisted polystyrene colloidal lithography. Gold is chosen to demonstrate the validity of such a strategy. The hexagonally arranged Au nanodisk and nanohole arrays are thus fabricated with large area and good uniformity. The structural parameters of the arrays, such as thicknesses, diameters, and spacings of the nanodisks or nanoholes, are facilely tunable and controllable by predeposition conditions, etching conditions and colloidal monolayer structure. More importantly, these arrays can be produced on any supporting substrates, such as conductive or nonconductive and even flexible substrates with flat, rough, or even curved surfaces. In general, the presented strategy is low in cost, simple in operation and arbitrary in substrate, and the as-prepared arrays could find potential devices’ applications with nice compatibility in the fields of optics, surface-enhanced Raman spectroscopy, biosensing, and so forth.
研究领域:
纳米技术
·
材料科学
·
光学
·
生物传感
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）