Enhanced Catalytic Activity of Sub-nanometer Titania Clusters Confined inside Double-Wall Carbon Nanotubes.
Summary of "Enhanced Catalytic Activity of Sub-nanometer Titania Clusters Confined inside Double-Wall Carbon Nanotubes."
Sub-nanometer titania clusters have been homogeneously dispersed within double-wall carbon nantubes (DWNTs) with an inner diameter ranging from 1.0 to 1.5 nm. The confined titania exhibits a much higher activity than the titania particles attached on the outside walls of the DWNTs (the outside titania) in the epoxidation of propylene by H(2) O(2) . XPS, XANES and Raman spectroscopy data suggest electron transfer from titanium to the inner surfaces of the DWNTs. In contrast, no electron transfer has been observed for the outside titania. We also found that the extent of this confinement-induced electron transfer is temperature dependent. The enhanced activity of the confined titania clusters is likely attributed to their small sizes and the interaction with the DWNT surface. The synthesis method that we developed here can be readily applied to incorporation of other metal/metal oxide nanoparticles into carbon nanotubes.
State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, the Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023 (PR China), Fax: (+86) 411 8469 4447.
This article was published in the following journal.
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/21365773
- DOI: http://dx.doi.org/10.1002/cssc.201000324
We have investigated model systems of silver clusters with different sizes (3 and 15 atoms) deposited on alumina and titania supports using ambient pressure X-ray photoelectron spectroscopy. The elect...
The facile and rapid synthesis of tiny Pd@Co core-shell nanoparticles (NPs, ∼2.5 nm) stabilized by a metal-organic framework (MOF) based on a double-solvent approach (DSA) under mild conditions is e...
Titania and doped-titania coatings can be deposited by a wide range of techniques; this paper will concentrate on magnetron sputtering techniques, including "conventional" reactive co-sputtering from ...
Fullerene (C60) enhanced mesoporous CdS/TiO2 architectures were fabricated by an evaporation induced self-assembly route together with an ion-exchanged method. C60 clusters were incorporated into the ...
Photodegradation of organic dye molecules has attracted extensive attention because of their high toxicity to water resources. Compared with traditional UV-visible spectroscopy, SERS technology can re...
- The Martinique island (French West-Indies) is an area of high prevalence and incidence for Systemic Lupus Erythematosus (SLE), respectively 64,2/ 100000 and 4,7/ 100000. In ma...
This study will help determine if CoQ10 and prednisone, alone and as a combination decrease the decline in cardiopulmonary and skeletal muscle function that occurs in the wheelchair confin...
The complexity of cancer patients' symptoms and health problems constitutes considerable distress and burden for patients and their family caregivers. To help them manage the illness effec...
The purpose of this study is to examine the safety and effectiveness of USL261 for the outpatient treatment of seizure clusters.
To assess, in donor-recipient clusters, current models of HIV-1 genetic evolution and pathogenesis, based on the sequence diversity displayed by this lentivirus.
Medical and Biotech [MESH] Definitions
RNA that has catalytic activity. The catalytic RNA sequence folds to form a complex surface that can function as an enzyme in reactions with itself and other molecules. It may function even in the absence of protein. There are numerous examples of RNA species that are acted upon by catalytic RNA, however the scope of this enzyme class is not limited to a particular type of substrate.
Biological molecules that possess catalytic activity. They may occur naturally or be synthetically created. Enzymes are usually proteins, however CATALYTIC RNA and CATALYTIC DNA molecules have also been identified.
A malignancy arising in uterine cervical epithelium and confined thereto, representing a continuum of histological changes ranging from well-differentiated CIN 1 (formerly, mild dysplasia) to severe dysplasia/carcinoma in situ, CIN 3. The lesion arises at the squamocolumnar cell junction at the transformation zone of the endocervical canal, with a variable tendency to develop invasive epidermoid carcinoma, a tendency that is enhanced by concomitant human papillomaviral infection. (Segen, Dictionary of Modern Medicine, 1992)
Molecules of DNA that possess enzymatic activity.
Inherited conditions characterized by the partial loss of ADIPOSE TISSUE, either confined to the extremities with normal or increased fat deposits on the face, neck and trunk (type 1), or confined to the loss of SUBCUTANEOUS FAT from the limbs and trunk (type 2).