共查询到20条相似文献,搜索用时 171 毫秒
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Elena O. Filippova Roman V. Shafigulin Alexander A. Tokranov Alexander А. Shmelev Andzhela V. Bulanova Andrey А. Pimerzin Alexander A. Karaev 《中国化学会会志》2020,67(7):1167-1173
Mesoporous silica (MPS) modified with nickel and MPS doped with dysprosium and modified with nickel have been synthesized by the template method. The adsorbents are characterized by various techniques such as transmission electron microscopy, scanning electron microscopy, X-ray diffraction, inductively coupled plasma spectroscopy, and X-ray fluorescence analyses. The adsorption properties of the synthesized samples have been investigated by inverse gas chromatography. Furthermore, thermodynamic characteristics of the adsorption of test compound belonging to different classes of organic compounds were obtained. In addition, the contributions of the energy of specific interactions to the total adsorption energy were calculated. It is also shown that entropy plays the determining role in the adsorption of test compounds on synthesized mesoporous materials. 相似文献
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Tewodros Asefa Amy N. Otuonye Gang Wang Elizabeth A. Blair Rajyalakshmi Vathyam Kelley Denton 《Adsorption》2009,15(3):287-299
A series of mesoporous nanosphere materials that are functionalized with various terminal and bridging organic groups were
synthesized. They have improved adsorption capacity and different release properties for drug and small molecules. The materials
contained terminal vinyl, 3-mercaptopropyl, 3-aminopropyl, and secondary amine functional groups and bridging ethane, ethene,
and benzene groups within their mesopore channel walls. The samples containing mercaptopropyl and vinyl groups showed greater
adsorption capacity and better controlled release behavior for rhodamine 6G molecules. On the other hand, mesoporous matrices
containing amine functional groups showed higher adsorption capacity and better release properties for ibuprofen molecules.
Further studies revealed that the bridging organic groups in the mesopore channel walls also improved the adsorption capacity
and release properties of the materials compared to the corresponding samples containing no bridging organic groups. Such
improved adsorption and controlled release properties of molecules by simple changes of functional groups on mesoporous materials
are important for the development of nanomaterial drug delivery vehicles and for controlled release of drugs over long time
periods at specific targeted sites in the body. By judicious choice of organic groups and by systematic design and synthetic
approaches, nanoporous materials having different adsorption capacity and release properties for many other drug molecules
can also be achieved. 相似文献
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Dr. Cuiling Li Prof. Saad M. Alshehri Dr. Tansir Ahamad Dr. Joel Henzie Prof. Yusuke Yamauchi 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(21):7174-7178
Mesoporous Trimetallic PtPdRu Spheres with well‐defined spherical morphology and uniformly sized pores were synthesized in an aqueous solution using ascorbic acid as the reducing agent and triblock copolymer F127 as the pore directing agent. These mesoporous PtPdRu spheres exhibited enhanced electrocatalytic activity compared to commercial Pt black, resulting in a ~4.9 times improvement in mass activity for the methanol oxidation reaction. The excellent electrocatalytic activity and stability are due to the unique mesoporous architecture and electronic landscape between different elements. 相似文献
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《化学:亚洲杂志》2017,12(18):2467-2470
We previously succeeded to prepare stable mesoporous Cu films on Au‐coated conductive working electrodes by using polystyrene‐b ‐poly(oxyethylene) (PS63 000‐b ‐PEO26 000) micelles as template and sulfuric acid to increase ionic conductivity. In the present study, we report the preparation of mesoporous Cu films on Cu foil. By changing the Cu salts and electrodeposition potentials, we discuss how these parameters influence the final product. Without having to filtrate interefering species, such as uric acid, ascorbic acid and glucose, the dopamine concentration can be precisely determined by applying a suitable potential. Therefore, non‐invasive electrochemical sensing based on mesoporous films will be useful for daily diagnosis of mental disorder. 相似文献
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Dealloying of Mesoporous PtCu Alloy Film for the Synthesis of Mesoporous Pt Films with High Electrocatalytic Activity 下载免费PDF全文
Dr. Cuiling Li Dr. Victor Malgras Dr. Ali Aldalbahi Prof. Yusuke Yamauchi 《化学:亚洲杂志》2015,10(2):316-320
Mesoporous Pt film with highly electrocatalytic activity is successfully synthesized by dealloying of mesoporous PtCu alloy film prepared through electrochemical micelle assembly. The resulting mesoporous electrode exhibits high current density and superior stability toward the methanol oxidation reaction. 相似文献
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Andreas Keilbach Markus Döblinger Dr. Ralf Köhn Dr. Heinz Amenitsch Dr. Thomas Bein Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(27):6645-6650
Confined tubes : Periodic mesoporous organosilica (PMO) mesophases were synthesized within the confined tubular environment of anodic alumina membrane (AAM) channels, resulting in the formation of either the hexagonal circular or the cubic mesophase.
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Guo Y Mylonakis A Zhang Z Yang G Lelkes PI Che S Lu Q Wei Y 《Chemistry (Weinheim an der Bergstrasse, Germany)》2008,14(9):2909-2917
The synthesis and characterization of novel electroactive periodic mesoporous organosilica (PMO) are reported. The silsesquioxane precursor, N,N'-bis(4'-(3-triethoxysilylpropylureido)phenyl)-1,4-quinonene-diimine (TSUPQD), was prepared from the emeraldine base of amino-capped aniline trimer (EBAT) using a one-step coupling reaction and was used as an organic silicon source in the co-condensation with tetraethyl orthosilicate (TEOS) in proper ratios. By means of a hydrothermal sol-gel approach with the cationic surfactant cetyltrimethyl-ammonium bromide (CTAB) as the structure-directing template and acetone as the co-solvent for the dissolution of TSUPQD, a series of novel MCM-41 type siliceous materials (TSU-PMOs) were successfully prepared under mild alkaline conditions. The resultant mesoporous organosilica were characterized by Fourier transform infrared (FT-IR) spectroscopy, thermogravimetry, X-ray diffraction, nitrogen sorption, and transmission electron microscopy (TEM) and showed that this series of TSU-PMOs exhibited hexagonally patterned mesostructures with pore diameters of 2.1-2.8 nm. Although the structural regularity and pore parameters gradually deteriorated with increasing loading of organic bridges, the electrochemical behavior of TSU-PMOs monitored by cyclic voltammetry demonstrated greater electroactivities for samples with higher concentration of the incorporated TSU units. 相似文献
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Polymeric Micelle Assembly for the Smart Synthesis of Mesoporous Platinum Nanospheres with Tunable Pore Sizes 下载免费PDF全文
Yunqi Li Dr. Bishnu Prasad Bastakoti Dr. Victor Malgras Dr. Cuiling Li Jing Tang Prof. Jung Ho Kim Prof. Yusuke Yamauchi 《Angewandte Chemie (International ed. in English)》2015,54(38):11073-11077
A facile method for the fabrication of well‐dispersed mesoporous Pt nanospheres involves the use of a polymeric micelle assembly. A core–shell–corona type triblock copolymer [poly(styrene‐b‐2‐vinylpyridine‐b‐ethylene oxide), PS‐b‐P2VP‐b‐PEO] is employed as the pore‐directing agent. Negatively charged PtCl42? ions preferably interact with the protonated P2VP+ blocks while the free PEO chains prevent the aggregation of the Pt nanospheres. The size of the mesopores can be finely tuned by varying the length of the PS chain. Furthermore, it is demonstrated that the metallic mesoporous nanospheres thus obtained are promising candidates for applications in electrochemistry. 相似文献
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Back Cover: Polymeric Micelle Assembly for the Smart Synthesis of Mesoporous Platinum Nanospheres with Tunable Pore Sizes (Angew. Chem. Int. Ed. 38/2015) 下载免费PDF全文
Yunqi Li Dr. Bishnu Prasad Bastakoti Dr. Victor Malgras Dr. Cuiling Li Jing Tang Prof. Jung Ho Kim Prof. Yusuke Yamauchi 《Angewandte Chemie (International ed. in English)》2015,54(38):11290-11290
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Prof. Li Wang Jiahua Zhao Prof. Pengfei Zhang Dr. Shize Yang Prof. Wangcheng Zhan Prof. Sheng Dai 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(36):8494-8498
Ruthenium (Ru)@Ordered mesoporous carbon (OMC) is a key catalyst in fine-chemical production. In general, the OMC support is prepared by a wet self-assembly requiring excessive solvent, toxic phenol–aldehyde precursors and a long reaction time, followed by post-immobilization to load Ru species. Herein, we wish to report a solid-state, rapid, and green strategy for the synthesis of Ru@OMC with biomass tannin as the precursor. The chemistry essence of this strategy lies in the mechanical-force-driven assembly, during which tannin-metal (Zn2+ and Ru3+) coordination polymerization and hydrogen-bonding interactions between tannin-block copolymer (PEO-PPO-PEO, F127) simultaneously occur. After thermal treatment, Ru@OMC catalysts with mesoporous channels, narrow pore-size distribution (≈7 nm), and high surface area (up to 779 m2 g−1) were directed by F127 micelles. Meanwhile, the Zn2+ ions dilute Ru3+ and avoid the sintering of Ru species, resulting in Ru clusters around 1.4–1.7 nm during carbonization (800 °C). Moreover, the Ru@OMC catalyst afforded a good activity (TOF: up to 4170 h−1) in the selective oxidation of benzyl alcohol to benzaldehyde by molecular oxygen. 相似文献
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《化学:亚洲杂志》2017,12(8):877-881
In the present work, 2.4 nm gold nanoparticles (Au NPs) are uniformly dispersed on mesoporous titania thin films which are structurally tuned by controlling the calcination temperature. The gold content of the catalyst is as high as 27.8 wt %. To our knowledge, such a high loading of Au NPs with good dispersity has not been reported until now. Furthermore, the reaction rate of the gold particles is enhanced by one order of magnitude when supported on mesoporous titania compared to non‐porous titania. This significant improvement can be explained by an increase in the diffusivity of the substrate due to the presence of mesopores, the resistance to agglomeration, and improved oxygen activation. 相似文献
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Dr. Xiangzhi Cui Dr. Zile Hua Dr. Chenyang Wei Dr. Zhu Shu Dr. Liangxia Zhang Dr. Hangrong Chen Prof. Jianlin Shi 《化学:亚洲杂志》2013,8(2):429-436
A meostructured WO3/C composite with crystalline framework and high electric conductivity has been synthesized by a new in situ carbonization–replication route using the block copolymer (poly(ethylene glycol)‐block‐poly(propylene glycol)‐block‐poly(ethylene glycol)) present in situ in the pore channels of mesoporous silica template as carbon source. X‐ray diffraction, X‐ray photoelectron spectroscopy, transmission electron microscopy, thermogravimetry differential thermal analysis, and N2 adsorption techniques were adopted for the structural characterization. Cyclic voltammetry, chronoamperometry, and single‐cell test for hydrogen electrochemical oxidation were adopted to characterize the electrochemical activities of the mesoporous WO3/C composite. The carbon content and consequent electric conductivity of these high‐surface‐area (108–130 m2 g?1) mesostructured WO3/C composite materials can be tuned by variation of the duration of heat treatment, and the composites exhibited high and stable electrochemical catalytic activity. The single‐cell test results indicated that the mesostructured WO3/C composites showed clear electrochemical catalytic activity toward hydrogen oxidation at 25 °C, which makes them potential non‐precious‐metal anode catalysts in proton exchange membrane fuel cell. 相似文献
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