The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Yan Yang - One of the best experts on this subject based on the ideXlab platform.
-
Organosilane assisted transformation from core shell to yolk shell nanocomposites
Chemistry of Materials, 2011Co-Authors: Yan Yang, Jian Liu, Xiao Liu, Qihua Yang YangAbstract:In this paper, we present the synthesis of yolk–shell nanocomposites (NCs) with moveable cores (Fe3O4, Au nanoparticles (NPs)) and functionalized organosilica mesoporous shells by an Organosilane-assisted etching approach for the first time. This synthesis method is facile, general, and rapid. By adding Organosilanes such as 1,2-bis(trimethoxysilyl)ethane (BTME) and 1,4-bis(triethoxysilyl)benzene (BTEB) into the synthetic medium of NPs@silica (Fe3O4 and Au NPs) core–shell NCs, the organosilica species deposit on the surface of the core–shell NCs, while the initial silica shells can be subsequently dissolved to form the yolk–shell NCs. The formation of such yolk–shell NCs can be reasonably explained by a novel Organosilane-assisted etching mechanism based on the results of FT-IR and 29Si NMR spectroscopy. The yolk–shell NCs with Au cores exhibit much higher catalytic activity than the Au@silica core–shell NCs for the catalytic reduction of o-nitroaniline, probably due to the higher accessibility of the Au ...
Cuixiang Guo - One of the best experts on this subject based on the ideXlab platform.
-
fabrication and characterization of hierarchical zsm 5 zeolites by using Organosilanes as additives
Chemical Engineering Journal, 2011Co-Authors: Yaping Guo, Haijin Wang, Yajun Guo, Lihua Guo, Lianfeng Chu, Cuixiang GuoAbstract:Abstract Two synthesis strategies were utilized to fabricate hierarchical ZSM-5 zeolites by using 3-aminopropyltrimethoxysilane (APTMS), N-[3-(trimethoxysilyl)propyl] ethylenediamine (TMPED) and (N,N-diethyl-3-aminopropyl)trimethoxysilane (DATMS) as additives. The first synthesis strategy comprises three steps: preparation of the zeolite precursors, anchoring of the Organosilanes onto the zeolite precursors, and formation of the hierarchical ZSM-5 zeolites. The second synthesis strategy is similar to the above strategy, except that the Organosilanes are directly added into the original reaction solution. The hierarchical ZSM-5 zeolites exhibit an ellipsoidal shape with a long-axis length of ∼750 nm and short-axis length of ∼550 nm, which include lots of nanocrystals with a size of ∼25 nm. The aggregation of the nanocrystals leads to forming mesopores with a size of 2.8 nm and supermicropores with a size of 1.4 nm or 1.8 nm. However, the ZSM-5 zeolites prepared without using the Organosilanes as additives exhibit an irregular shape with a broad particle size distribution. Benzene alkylation with ethene was carried out with ZSM-5 zeolites in a fixed bed reactor. The results show that the hierarchical ZSM-5 zeolites exhibit the higher C2H4 conversion and ethylbenzene selectivity than the conventional ZSM-5 zeolites.
Qihua Yang Yang - One of the best experts on this subject based on the ideXlab platform.
-
Organosilane assisted transformation from core shell to yolk shell nanocomposites
Chemistry of Materials, 2011Co-Authors: Yan Yang, Jian Liu, Xiao Liu, Qihua Yang YangAbstract:In this paper, we present the synthesis of yolk–shell nanocomposites (NCs) with moveable cores (Fe3O4, Au nanoparticles (NPs)) and functionalized organosilica mesoporous shells by an Organosilane-assisted etching approach for the first time. This synthesis method is facile, general, and rapid. By adding Organosilanes such as 1,2-bis(trimethoxysilyl)ethane (BTME) and 1,4-bis(triethoxysilyl)benzene (BTEB) into the synthetic medium of NPs@silica (Fe3O4 and Au NPs) core–shell NCs, the organosilica species deposit on the surface of the core–shell NCs, while the initial silica shells can be subsequently dissolved to form the yolk–shell NCs. The formation of such yolk–shell NCs can be reasonably explained by a novel Organosilane-assisted etching mechanism based on the results of FT-IR and 29Si NMR spectroscopy. The yolk–shell NCs with Au cores exhibit much higher catalytic activity than the Au@silica core–shell NCs for the catalytic reduction of o-nitroaniline, probably due to the higher accessibility of the Au ...
Xiao Liu - One of the best experts on this subject based on the ideXlab platform.
-
Organosilane assisted transformation from core shell to yolk shell nanocomposites
Chemistry of Materials, 2011Co-Authors: Yan Yang, Jian Liu, Xiao Liu, Qihua Yang YangAbstract:In this paper, we present the synthesis of yolk–shell nanocomposites (NCs) with moveable cores (Fe3O4, Au nanoparticles (NPs)) and functionalized organosilica mesoporous shells by an Organosilane-assisted etching approach for the first time. This synthesis method is facile, general, and rapid. By adding Organosilanes such as 1,2-bis(trimethoxysilyl)ethane (BTME) and 1,4-bis(triethoxysilyl)benzene (BTEB) into the synthetic medium of NPs@silica (Fe3O4 and Au NPs) core–shell NCs, the organosilica species deposit on the surface of the core–shell NCs, while the initial silica shells can be subsequently dissolved to form the yolk–shell NCs. The formation of such yolk–shell NCs can be reasonably explained by a novel Organosilane-assisted etching mechanism based on the results of FT-IR and 29Si NMR spectroscopy. The yolk–shell NCs with Au cores exhibit much higher catalytic activity than the Au@silica core–shell NCs for the catalytic reduction of o-nitroaniline, probably due to the higher accessibility of the Au ...
Jian Liu - One of the best experts on this subject based on the ideXlab platform.
-
Organosilane assisted transformation from core shell to yolk shell nanocomposites
Chemistry of Materials, 2011Co-Authors: Yan Yang, Jian Liu, Xiao Liu, Qihua Yang YangAbstract:In this paper, we present the synthesis of yolk–shell nanocomposites (NCs) with moveable cores (Fe3O4, Au nanoparticles (NPs)) and functionalized organosilica mesoporous shells by an Organosilane-assisted etching approach for the first time. This synthesis method is facile, general, and rapid. By adding Organosilanes such as 1,2-bis(trimethoxysilyl)ethane (BTME) and 1,4-bis(triethoxysilyl)benzene (BTEB) into the synthetic medium of NPs@silica (Fe3O4 and Au NPs) core–shell NCs, the organosilica species deposit on the surface of the core–shell NCs, while the initial silica shells can be subsequently dissolved to form the yolk–shell NCs. The formation of such yolk–shell NCs can be reasonably explained by a novel Organosilane-assisted etching mechanism based on the results of FT-IR and 29Si NMR spectroscopy. The yolk–shell NCs with Au cores exhibit much higher catalytic activity than the Au@silica core–shell NCs for the catalytic reduction of o-nitroaniline, probably due to the higher accessibility of the Au ...