نتایج جستجو برای: mesoporous structure

تعداد نتایج: 1576810  

2010
P. Cheyssac A. ten Bosch

Mesoporous materials are characterized by the density of empty or filled pores which modulates their properties, in particular, optical properties. Although pores scatter light, the scattered energy or reflectance spectra of a mesoporous layer show a behaviour that can be attributed mainly to interference created by the interfaces; however, coherent scattering is still present inside the mesopo...

2016
Chengwei Zhang Lianbin Xu Yushan Yan Jianfeng Chen

Catalysts for methanol oxidation reaction (MOR) are at the heart of key green-energy fuel cell technology. Nanostructured Pt materials are the most popular and effective catalysts for MOR. Controlling the morphology and structure of Pt nanomaterials can provide opportunities to greatly increase their activity and stability. Ordered nanoporous Pt nanowires with controlled large mesopores (15, 30...

Journal: :Physical chemistry chemical physics : PCCP 2006
S Hudson D A Tanner W Redington E Magner K Hodnett S Nakahara

TEM analysis of mesoporous materials is generally undertaken to give qualitative results. Accurate quantitative analysis is demonstrated in this study. A systematic image analysis of a powder form of a hexagonal mesoporous material known as KIT-6 is conducted using a transmission electron microscope (TEM). Three types of image contrast typically appear in this material (a hexagonal honeycomb st...

Journal: :The journal of physical chemistry. B 2005
Jong-Sung Yu Suk Bon Yoon Yun Jo Lee Kyung Byung Yoon

In this work, an attempt has been made to modify the shape and nanostructure of core-shell materials, which have been usually generated on the basis of amorphous spherical cores. Novel core-shell silicate particles, each of which consists of a silicalite-1 zeolite crystal core and mesoporous shell (ZCMS), were synthesized for the first time. The ZCMS core-shell particles are unique because they...

Journal: :Chemical communications 2011
Renhong Li Hisayoshi Kobayashi Junfang Guo Jie Fan

The surface structure of mesoporous TiO(2) is reconstructed via a visible-light-driven reaction with benzyl alcohol molecules at mild, anaerobic conditions, which substantially extends its visible-light absorption and photocatalytic activities.

Journal: :Chemical communications 2012
Panpan Su Liang Jiang Jiao Zhao Jingwang Yan Can Li Qihua Yang

Mesoporous graphitic carbon nanodisks with hierarchical porous structure, facilely fabricated by catalytic carbonization of iron-based coordination polymer nanodisks, exhibit high capacitance even at high scan rates as electrode materials for electrochemical double layer capacitors.

Journal: :Chemical communications 2008
Eko Adi Prasetyanto Seung-Cheol Lee Sung-Min Jeong Sang-Eon Park

l-Proline was immobilized onto mesoporous silica through direct synthesis method via morphosynthesis possessing short channels and plugs in the pore structure which provided chiral enhancement in the diethyl malonate addition reaction.

Journal: :Chemical communications 2010
Li Li Methira Krissanasaeranee Sebastian W Pattinson Morgan Stefik Ulrich Wiesner Ullrich Steiner Dominik Eder

We used polyisoprene-block-ethyleneoxide copolymers as structure-directing agents to synthesise well-ordered and highly-crystalline mesoporous WO(3) architectures that possess improved photocatalytic properties due to enhanced dye-adsorption in absence of diffusion limitation.

Journal: :Chemical communications 2006
Piotr Krawiec Dorin Geiger Stefan Kaskel

Ordered mesoporous SiC with high specific surface area (650-800 m(2) g(-1)) and well ordered pore structure was obtained via nanocasting of polycarbosilanes into SBA-15 and subsequent conversion of the polymer at 1300 degrees C.

Journal: :Angewandte Chemie 2022

Abstract Recently, dendritic mesoporous silica nanoparticles with widespread applications have attracted great interest. Despite many publications (>800), the terminology “dendritic” is ambiguous. Understanding what possible “dendritic structures” are, their formation mechanisms and underlying structure–property relationship fundamentally important. With advance of characterization technique...

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