The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
John Q. Xiao - One of the best experts on this subject based on the ideXlab platform.
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Protein-Templated Near-Infrared Emitting Fe Nanoclusters Exhibit Superparamagnetism at Room Temperature
2018 IEEE 18th International Conference on Nanotechnology (IEEE-NANO), 2018Co-Authors: Rebecca E. Jimenez, Nile J. Bunce, Harsha Kannan, John Q. Xiao, Raj K. Gupta, Shashi P. KamaAbstract:Water soluble Fe nanoclusters in the size ranging from 1.4 to 5 nm, exhibiting photoemission in the visible $(\lambda_{\text{em}}=450\ \text{nm})$ and near-infrared region $(\lambda_{\text{em}}=845\ \text{nm})$ have been synthesized with the use of mixed proteins. The protein-templated Fe nanoclusters exhibit Superparamagnetism at room temperature, offering potential applications in bio-labeling and imaging.
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high temperature annealing induced Superparamagnetism in cofeb mgo cofeb tunneling junctions
Journal of Applied Physics, 2010Co-Authors: Weigang Wang, L R Shah, John Q. XiaoAbstract:We have investigated the evolution of the magnetic transport properties as a function of short annealing time in CoFeB/MgO/CoFeB based magnetic tunnel junctions (MTJs) with a free layer of 2 nm. It is found that the hysteresis behaviors in magnetoresistance (MR) loops disappear in samples annealed for 17 min. The linear region between MR and the applied field gradually increases. The MR loops without hysteresis can be well fitted by using the Superparamagnetism theory, suggesting the formation of superparamagnetic particles in the free layer during the high temperature annealing. The control of MTJ properties with annealing time is desirable in magnetic field sensor productions.
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High temperature annealing induced Superparamagnetism in CoFeB/MgO/CoFeB tunneling junctions
Journal of Applied Physics, 2010Co-Authors: Weigang Wang, L R Shah, John Q. XiaoAbstract:We have investigated the evolution of the magnetic transport properties as a function of short annealing time in CoFeB/MgO/CoFeB based magnetic tunnel junctions (MTJs) with a free layer of 2 nm. It is found that the hysteresis behaviors in magnetoresistance (MR) loops disappear in samples annealed for 17 min. The linear region between MR and the applied field gradually increases. The MR loops without hysteresis can be well fitted by using the Superparamagnetism theory, suggesting the formation of superparamagnetic particles in the free layer during the high temperature annealing. The control of MTJ properties with annealing time is desirable in magnetic field sensor productions.
Darko Makovec - One of the best experts on this subject based on the ideXlab platform.
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Nanocomposites containing embedded superparamagnetic iron oxide nanoparticles and rhodamine 6G
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2009Co-Authors: Darko Makovec, Stanislav ??ampelj, Uro?? Maver, Janko Jamnik, Miha Drofenik, Milena Zorko, Marjan Bele, Miran Gaber????ekAbstract:Bifunctional nanocomposites possessing Superparamagnetism and traceability with optical methods were prepared. The superparamagnetic properties were achieved by introducing highly concentrated, ca. 13 nm-sized maghemite (??-Fe2O3) nanoparticles into a silica matrix based on tetraethylorthosilicate (TEOS) and bis-1,2-(triethoxysilyl)ethane (BTSE). Traceability was attained by simultaneously incorporating a small amount of rhodamine 6G fluorescent dye into the same silica matrix. Agglomeration of the highly concentrated maghemite nanoparticles during the preparation procedure was prevented by pre-coating them with a 1-2 nm thick silica layer. The nanocomposites exhibited a relatively high magnetization of ???20 emu/g. Superparamagnetism was demonstrated using ZFC and FC measurements. Although the presence of the nanoparticles modified the transparency of the pristine silica matrix, we show that the incorporated rhodamine 6G exhibits a well-resolved, blue-shifted peak in the fluorescence spectrum, with a maximum at about 552 nm. The bifunctionality of the present nanocomposites could be interesting for the preparation of similar materials for biomedical applications. ?? 2008 Elsevier B.V. All rights reserved.
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Nanocomposites containing embedded superparamagnetic iron oxide nanoparticles and rhodamine {6G}
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2009Co-Authors: Darko Makovec, Uro?? Maver, Stanislav Čampelj, Janko Jamnik, Miha Drofenik, Milena Zorko, Marjan Bele, Miran GaberščekAbstract:Bifunctional nanocomposites possessing Superparamagnetism and traceability with optical methods were prepared. The superparamagnetic properties were achieved by introducing highly concentrated, ca. 13 nm-sized maghemite {([gamma]-Fe2O3)} nanoparticles into a silica matrix based on tetraethylorthosilicate {(TEOS)} and bis-1,2-(triethoxysilyl)ethane {(BTSE).} Traceability was attained by simultaneously incorporating a small amount of rhodamine {6G} fluorescent dye into the same silica matrix. Agglomeration of the highly concentrated maghemite nanoparticles during the preparation procedure was prevented by pre-coating them with a 1-2 nm thick silica layer. The nanocomposites exhibited a relatively high magnetization of {\textasciitilde}20 emu/g. Superparamagnetism was demonstrated using {ZFC} and {FC} measurements. Although the presence of the nanoparticles modified the transparency of the pristine silica matrix, we show that the incorporated rhodamine {6G} exhibits a well-resolved, blue-shifted peak in the fluorescence spectrum, with a maximum at about 552 nm. The bifunctionality of the present nanocomposites could be interesting for the preparation of similar materials for biomedical applications.
Hua Li - One of the best experts on this subject based on the ideXlab platform.
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High Strength Self-Healing Magnetic Elastomers with Shape Memory Effect
Macromolecular Materials and Engineering, 2016Co-Authors: Xian Qi Feng, Gong Zheng Zhang, Quan Ming Bai, Hao Yang Jiang, Bo Xu, Hua LiAbstract:Development of self-healing and shape memory elastomers is important for artificial smart materials. Here, a novel shape memory magnetic elastomer with high mechanical strength consisting of conventional polymer and Fe3O4 nanoparticles is reported. The elastomer exhibit Superparamagnetism, and superior self-healing performance at elevated temperature. The tensile strength of the healed elastomer can be up to 12.0 MPa, and almost equal to that of virginal sample. These materials are capable of remote controlling in shape memory process and actuating behavior, and can be used in many applications, ranging from wireless-controller to actuator or biomedical devices, and other remote shape memory systems.
Miran Gaberšček - One of the best experts on this subject based on the ideXlab platform.
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Nanocomposites containing embedded superparamagnetic iron oxide nanoparticles and rhodamine {6G}
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2009Co-Authors: Darko Makovec, Uro?? Maver, Stanislav Čampelj, Janko Jamnik, Miha Drofenik, Milena Zorko, Marjan Bele, Miran GaberščekAbstract:Bifunctional nanocomposites possessing Superparamagnetism and traceability with optical methods were prepared. The superparamagnetic properties were achieved by introducing highly concentrated, ca. 13 nm-sized maghemite {([gamma]-Fe2O3)} nanoparticles into a silica matrix based on tetraethylorthosilicate {(TEOS)} and bis-1,2-(triethoxysilyl)ethane {(BTSE).} Traceability was attained by simultaneously incorporating a small amount of rhodamine {6G} fluorescent dye into the same silica matrix. Agglomeration of the highly concentrated maghemite nanoparticles during the preparation procedure was prevented by pre-coating them with a 1-2 nm thick silica layer. The nanocomposites exhibited a relatively high magnetization of {\textasciitilde}20 emu/g. Superparamagnetism was demonstrated using {ZFC} and {FC} measurements. Although the presence of the nanoparticles modified the transparency of the pristine silica matrix, we show that the incorporated rhodamine {6G} exhibits a well-resolved, blue-shifted peak in the fluorescence spectrum, with a maximum at about 552 nm. The bifunctionality of the present nanocomposites could be interesting for the preparation of similar materials for biomedical applications.
Miran Gaber????ek - One of the best experts on this subject based on the ideXlab platform.
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Nanocomposites containing embedded superparamagnetic iron oxide nanoparticles and rhodamine 6G
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2009Co-Authors: Darko Makovec, Stanislav ??ampelj, Uro?? Maver, Janko Jamnik, Miha Drofenik, Milena Zorko, Marjan Bele, Miran Gaber????ekAbstract:Bifunctional nanocomposites possessing Superparamagnetism and traceability with optical methods were prepared. The superparamagnetic properties were achieved by introducing highly concentrated, ca. 13 nm-sized maghemite (??-Fe2O3) nanoparticles into a silica matrix based on tetraethylorthosilicate (TEOS) and bis-1,2-(triethoxysilyl)ethane (BTSE). Traceability was attained by simultaneously incorporating a small amount of rhodamine 6G fluorescent dye into the same silica matrix. Agglomeration of the highly concentrated maghemite nanoparticles during the preparation procedure was prevented by pre-coating them with a 1-2 nm thick silica layer. The nanocomposites exhibited a relatively high magnetization of ???20 emu/g. Superparamagnetism was demonstrated using ZFC and FC measurements. Although the presence of the nanoparticles modified the transparency of the pristine silica matrix, we show that the incorporated rhodamine 6G exhibits a well-resolved, blue-shifted peak in the fluorescence spectrum, with a maximum at about 552 nm. The bifunctionality of the present nanocomposites could be interesting for the preparation of similar materials for biomedical applications. ?? 2008 Elsevier B.V. All rights reserved.