SEPARATION AND PURIFICATION TECHNOLOGY
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2020
·
IF 5.774
Lei Hou,Zhe Wang,Zhaoyu Chen,Wenbo Chen,Cancan Yang
PIM-1 and poly(arylene fluorene ether ketone) (Am-PAFEK) were synthesized by polycondensation . Their structures were characterized by 1 H NMR and FT-IR spectral analyses. A series of flexible and transparent blend membranes were prepared by solution blending with different ratios of PIM-1 and Am-PAFEK. DSC and SEM analyses showed good compatibility between them. PIM-1 and Am-PAFEK in the blend membrane perform their respective functions. The former provides excellent permeability; the latter provides high selectivity for CO 2 . Addition of 20% Am-PAFEK into the blend membrane increased the gas separation selectivity of CO 2 /CH 4 and CO 2 /N 2 by 75% and 65%, respectively. The optimum separation performance was achieved with blend membrane with a CO 2 permeability of 752.4 Barrer and a CO 2 /N 2 selectivity ratio of 26.7, extremely close to the Robeson upper bound (2008). After 140-days aging test, the blend membranes still maintained above 70% CO 2 permeability, indicating that it has good antiaging properties. Consequently, the new type of membranes have great potential in industrial applications.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
NPG Asia Materials
·
2016
·Vol. 8
·期 12
·e335
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IF 8.772
Dong Jiang Xue,Gao Zhong Feng,Zhang Ying,Li Bang Lin,Zhang Wei,Lei Jing Lei,Li Nian Bing,Luo Hong Qun
Water-soluble fluorescent Ag nanoclusters (Ag NCs) with distinct pH-switchable agglomeration and spectral signal responses are prepared using a facile etching method. Increased and decreased pH cause the Ag NCs to switch between agglomeration and dispersion, accompanied by decreases in and recoveries of fluorescence intensity and absorbance. The pH switchable behavior of the Ag NCs is attributed to carboxyl groups on the nanocluster surface that are rich in the citrate and amido functional groups of ligands (glutathione), creating an easily formed, weak molecular interaction among Ag NCs (for example, hydrogen bonding) and maintaining a balance in the colloidal solution, whereas a change in pH will disrupt the balance, leading to the reversible agglomeration of Ag NCs and the switchable spectral signal response. In addition, because urea and glucose can change the pH of a solution by producing NH 3 and gluconic acid in enzyme-catalyzed reactions, the pH-switchable behavior of the Ag NCs is used to develop them as an optical probe to establish a regenerated biosensing platform for the sensitive and selective detection of urea and glucose, and the test results are satisfactory.
研究领域:
生物化学
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分析化学
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纳米材料科学
✓ 已验证
DOI
高影响因子
NPG Asia Materials
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2015
·Vol. 7
·期 1
·e158
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IF 10.118
Wang Xiao,Liu Dapeng,Li Junqi,Zhen Jiangman,Zhang Hongjie
The fabrication of multi-component hybrid nanostructures is of vital importance because their two-phase interface could provide a rich environment for redox reactions, which are beneficial for enhancing catalytic performance. Inspired by the above consideration, strongly coupled Cu 2 O@CeO 2 core@shell nanostructures have been successfully prepared via a non-organic and clean aqueous route without using any organic additive. In this process, an auto-catalytic redox reaction occurred on the two-phase interface, followed by a triggered self-assembly process. Additionally, the size, morphology and composition of the as-obtained nanostructures can be tuned well by varying the reaction temperature, as well as the species and the amount of Cu precursors. The catalytic tests for peroxidase-like activity and CO oxidation have been conducted in detail, and the results confirm a strong synergistic effect at the interface sites between the CeO 2 and Cu 2 O components.
研究领域:
材料化学
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纳米催化
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界面科学
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无机合成
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能源化学
✓ 已验证
DOI
高影响因子
NPG Asia Materials
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2015
·Vol. 7
·期 5
·e182
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IF 10.118
Ou Chunlin,Hou Jungang,Wei Tian-Ran,Jiang Bo,Jiao Shuqiang,Li Jing-Feng,Zhu Hongmin
Thermoelectric materials can realize significant energy savings by generating electricity from untapped waste heat; however, the coupling of the thermoelectric parameters unfortunately limits their efficiency and practical applications. Herein, rational all-oxide TiC 1-x O x @TiO y -TiO 2 (x<1, 1
研究领域:
材料科学
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凝聚态物理
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能源材料
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纳米结构与器件
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热电转换
✓ 已验证
DOI
高影响因子
NPG Asia Materials
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2016
·Vol. 8
·期 4
·e263
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IF 8.772
Long Lu-Lu,Chen Jie-Jie,Zhang Xing,Zhang Ai-Yong,Huang Yu-Xi,Rong Qing,Yu Han-Qing
Metal sulfide semiconductors, such as molybdenum disulfide (MoS 2 ) and bismuth trisulphide (Bi 2 S 3 ), are of considerable interest for their excellent applications in photocatalysis and in many other fields. However, the controllable synthesis of MoS 2 /Bi 2 S 3 hybrid nanostructures remains a challenge. In this study, we report a unique sacrificial templating strategy for preparing layer-controlled MoS 2 on three-dimensional (3D) Bi 2 S 3 micro-flowers. For this approach, Bi 2 S 3 was utilized as a sacrificial template to regulate the ion exchange, and the dosage of molybdenum was adjusted to tune the dynamic formation, thus converting the MoS 2 nanosheets on the Bi 2 S 3 micro-flowers from monolayer to multilayer. Such a 3D flower-like hybrid nanostructure enables MoS 2 /Bi 2 S 3 to exhibit adsorption-promoted photocatalysis under visible light irradiation, especially for the excellent photodegradation of low-concentration organic pollutants, for example, azo dye and atrazine. The observed superiority of the 3D MoS 2 /Bi 2 S 3 was mainly attributed to the increased mass transfer, robust light-harvesting capacity, improved charge separation, lower oxygen-activation barrier and enhanced active oxygen yield. Our findings are of interest for the development of novel S-based photocatalysts and provide a new opportunity to efficiently remove low-concentration refractory pollutants.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
NPG Asia Materials
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2017
·Vol. 9
·期 5
·e380
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IF 9.157
Zhang Feilong,Fan Junbing,Zhang Pengchao,Liu Mingjie,Meng Jingxin,Jiang Lei,Wang Shutao
Synthetic polymer actuators have attracted increasing attention for their potential applications in artificial muscles, soft robotics and sensors. The majority of previous efforts have focused on smart hydrogels with bilayer structures that can change their shape in response to environmental stimuli, such as temperature, light and certain chemicals. However, the practical application of hydrogels is limited because of their low modulus and weak mechanical strength. Here we synthesized a robust monolithic actuator of a macro-scale hydro/organo binary cooperative Janus copolymer film. The process involves direct, one-step interfacial polymerization of immiscible hydrophilic and hydrophobic vinyl monomer solutions, and the resultant product exhibited binary cooperative shape transformation to multiple external stimuli. The Janus copolymer film can work in both aqueous solutions and organic solvents, with bidirectional and site-specific bending arising from cooperative asymmetric swelling/shrinking of the hydrogel and organogel networks. In addition, the as-prepared Janus copolymer film can act as a sensor element for solvent leakage detection. This binary cooperative strategy is applicable to most immiscible monomer systems and provides a general approach to developing novel functional copolymer materials.
研究领域:
材料科学
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高分子化学
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智能材料
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DOI
高影响因子
NPG Asia Materials
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2016
·Vol. 8
·期 11
·e323
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IF 8.772
Fang Jixiang,Li Jiang,Tian Cuifeng,Gao Qiangqiang,Wang Xiangjie,Gao Nengyue,Wen Xinglin,Ma Chuansheng,You Hongjun,Yang Zhilin,Xu Qing-Hua,Xiong Qihua,Li Zhiyuan
Toroidal Au or Ag nanostructures are of particular interest due to their unique optical responses and superior catalytic applications. However, the fabrication of ring-like Au or Ag nanostructures is limited to either electron beam lithography or template techniques, thus hampering their applications. Here, we present a new stress-driven structure collapse and etching mechanism to synthesize Au nanorings via a direct one-pot solution-based chemical reaction. The nanoparticle-mediated recrystallization process contributes to the formation of Au nanoframes, which contain unusual stress, thus promoting the breakup of the nanoframes and finally converting them into Au nanorings. The Au nanorings with tunable hole sizes exhibit interesting localized surface plasmon features owing to the coupling of bonding and antibonding modes on the inner and outer surfaces of the nanorings. This facile approach may open the door for the preparation of toroidal nanostructures in other compositions for numerous applications.
研究领域:
材料科学
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纳米技术
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光学
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产品关联
DOI
高影响因子
NPG Asia Materials
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2015
·Vol. 7
·期 5
·e179
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IF 10.118
Song Shuyan,Wang Xiao,Zhang Hongjie
Encapsulation of small noble metal nanoparticles has received attention owing to the resulting highly increased stability and high catalytic activity and selectivity. Among the types of inert metal oxides, CeO 2 is unique. It is inexpensive and highly stable, and, more importantly, the unique electronic configuration gives it a strong capability to provide active oxygen. The method of fabricating CeO 2 -encapsulated noble metal nanocatalysts is determined by the requirements of the application. In this review, we first describe the various types of encapsulated noble metals and then the current developments of synthesis in detail, including the types of hybrid nanostructures and successful synthetic strategies. The following section, concerning catalytic applications, is divided into three topics: anti-sintering capabilities, catalytic activities and selectivities. We hope that this review of the recent achievements and the proposed strategy for addressing the emerging challenges will inspire further developments in this research area.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
NPG Asia Materials
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2014
·Vol. 6
·期 7
·e114
·
IF 9.902
Lin Youhui,Huang Yanyan,Ren Jinsong,Qu Xiaogang
There has been great interest in the development of artificial inorganic nanomaterials that mimic natural peroxidases. Unfortunately, these nanomaterials usually possess relatively low catalytic activity and are generally considered to work effectively only within a narrow temperature range (for example, they are inactive at high temperatures). Intriguingly, adenosine triphosphate (ATP) is not only the ubiquitous energy currency of life, it is also known to form charge transfer complexes with aromatic molecules and to participate in free radical redox chemistry. Inspired by its unique properties, for the first time, we reveal a novel catalytic role for ATP and show that ATP is an ideal boosting agent for markedly improving the catalytic activity of a peroxidase mimic over a broad temperature range and, more significantly, making it possible to achieve exceptionally efficient high-temperature catalytic reactions. These observations pave the way for identifying highly effective modulators that promote the overall performance of artificial enzymes.
研究领域:
生物化学
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催化作用
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纳米材料
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酶工程
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产品关联
DOI
高影响因子
NPG Asia Materials
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2017
·Vol. 9
·期 5
·e383
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IF 9.157
Yin Ting,Zhang Qian,Wu Haigang,Gao Guo,Shapter Joseph G,Shen Yulan,He Qiaozhi,Huang Peng,Qi Wen,Cui Daxiang
Effectively prolonging the residence time of nanoprobes in the tumor region and reducing the accumulation of nanoprobes in the vital organs (for example, lung, liver and spleen) is crucial for high-efficiency photodynamic therapy (PDT) of cancer. Herein, we systematically report an ultra-small and highly stable nanoplatform with diameters of 4, 8 and 13 nm that exhibited excellent photodynamic therapeutic efficacy using Fe 3 O 4 @polymer-NPO/PEG-Glc@Ce6 nanoprobes. Based on the small size effect, the nanoprobes displayed lower cytotoxicity and excellent biocompatibility. Owing to the synergistic virtues of markedly active targeting and intrinsic small size effect, the Fe 3 O 4 @P-NPO/PEG-Glc@Ce6 nanoprobes can effectively prolong their residence time in the tumor region and reduce accumulation in the normal organs. Benefitting from the small size effect, the synthesized Fe 3 O 4 @P-NPO/PEG-Glc@Ce6 nanoprobes exhibited excellent tumor-targeting capability and photodynamic therapeutic efficacy by inhibiting the growth of tumors in mice under visible red light irradiation with a relatively lower power. The successful application of the small size effect in Fe 3 O 4 @P-NPO/PEG-Glc@Ce6 nanoprobes to significantly improve the PDT efficiency in our strategy suggests new building blocks for PDT of tumors and paves a new way for clinical therapies and translation in the near future.
研究领域:
纳米医学
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癌症治疗
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
NPG Asia Materials
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2017
·Vol. 9
·期 7
·e405
·
IF 9.157
Shi Wei,Yao Qin,Qu Sanyin,Chen Hongyi,Zhang Tiansong,Chen Lidong
The inhibitor-dependent poly(3,4-ethylenedioxythiophene) (PEDOT) fabrication suffers major problems in the areas of controllability and film thickness. In this work, we found that anions play a key role in both the polymerization and the structure of PEDOT. As a precursor, anions greatly influence the reaction rate and oxidant solubility. In its role as a counter-ion, the anions also affect chain conductance and crystal growth. With these behaviors in mind, a self-inhibited polymerization approach using novel oxidants with appropriate anions was successfully developed to facilitate the fabrication of high quality in situ polymerized PEDOT films and solve the thickness limitation problem. Inhibitor-free heavy oxidative solutions with weakly basic anions enable the spin-coating of thick and homogeneous oxidant layers and also effectively inhibit both the crystallization of the oxidant and H + formation throughout the polymerization process. PEDOT: dodecylbenzenesulfonate (PEDOT:DBSA) exhibits the highest performance among all candidates due to its appropriate anion basicity and low steric effect. An extremely high doping level of 42.9% is achieved, and an electrical conductivity of ~1100 S cm −1 is successfully maintained for film thicknesses between 310 nm and 1.79 μm. In addition, the thermoelectric power factor (RT) for pristine films was improved to 77.2 μW mK −2 from 69.6 μW mK −2 by the dedoping treatment. This study provides a new approach for fabricating high performance PEDOT thick films using anion-based design.
研究领域:
材料科学
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化学工程
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电子材料
✓ 已验证
产品关联
DOI
高影响因子
NPG Asia Materials
·
2017
·Vol. 9
·期 8
·e423
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IF 9.157
Li Huan,Chen Yangjun,Chen Tingting,Han Haijie,Tong Hongxin,Jin Qiao,Ji Jian
Learning from the antimalarial mechanism of artemisinin (ART) in nature, we explored methemoglobin (MHb) as a smart nanocarrier of ART, in which anticancer abilities can be turned on in situ through the upregulated reducing capacity of tumor tissue. Ultra violet–visible, electron paramagnetic resonance spectrometry and in vitro cell assessment proved that a reducing agent such as glutathione can work as an excellent biogenic trigger to reduce ferric iron in MHb to the ferrous state, activating the ability of ART to generate free radicals and resulting in cytotoxicity and apoptosis. In vivo investigations showed that the MHb–ART complex had encouraging anticancer outcomes. The bioinspired nanocarrier may pave a new way to achieve targeted toxicity to cancer cells with extremely low side effects.
研究领域:
肿瘤学
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药理学
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纳米医学
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生物化学
✓ 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）