The Experts below are selected from a list of 229995 Experts worldwide ranked by ideXlab platform
Junhui He - One of the best experts on this subject based on the ideXlab platform.
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Hierarchically Structured Porous Films of Silica Hollow Spheres via Layer-by-Layer Assembly and Their Superhydrophilic and Antifogging Properties
ChemPhysChem, 2008Co-Authors: Xin Du, Junhui HeAbstract:: Raspberrylike organic/inorganic composite spheres are prepared by stepwise electrostatic assembly of polyelectrolytes and silica nanoparticles onto monodisperse polystyrene spheres. Hierarchically Structured porous films of silica hollow spheres are fabricated from these composite spheres by layer-by-layer assembly with polyelectrolytes followed by calcination. The morphologies of the raspberrylike organic/inorganic composite spheres and the derived hierarchically Structured porous films are observed by scanning and transmission electron microscopy. The surface properties of these films are investigated by measuring their water contact angles, water-spreading speed, and antifogging properties. The results show that such hierarchically Structured porous films of silica hollow spheres have unique superhydrophilic and antifogging properties. Finally, the formation mechanism of these nanoStructures and Property-Structure relationships are discussed in detail on the basis of experimental observations.
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hierarchically Structured superhydrophilic coatings fabricated by self assembling raspberry like silica nanospheres
Joint International Conference on Information Sciences, 2007Co-Authors: Junhui HeAbstract:Raspberry-like silica nanospheres were prepared by electrostatic self-assembly of polyelectrolytes and monodisperse silica nanoparticles of two different sizes, and their coatings were fabricated via layer-by-layer assembly with polyelectrolytes and following calcination. The morphology of the raspberry-like silica nanospheres and their coatings were observed by scanning and transmission electron microscopies. The surface properties of these coatings were investigated by measuring their water contact angles, and the results showed that such hierarchically Structured coatings had unique superhydrophilic and antifogging properties. Finally, the formation mechanism and the Property-Structure relationship were discussed in details.
Tapani Ryhanen - One of the best experts on this subject based on the ideXlab platform.
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Properties of graphene inks stabilized by different functional groups
Nanotechnology, 2011Co-Authors: Di Wei, Chris Bower, Piers Andrew, Huafeng Yang, Dongxue Han, Li Niu, Qixian Zhang, Hongwei Li, Tapani RyhanenAbstract:Different graphene inks have been synthesized by chemical methods. These uniform dispersions were stabilized by various functional groups such as room temperature ionic liquid, polyaniline, polyelectrolyte (poly[2,5-bis(3-sulfonatopropoxy)-1,4-ethynylphenylene-alt-1,4-ethynylphenylene] sodium salt) and poly(styrenesulfonate) (PSS). The dispersions can be easily cast into high-quality, free-standing films but with very different physiochemical properties such as surface tension and adhesion. SEM and AFM methods have been applied to have a detailed study of the properties of the inks. It is found that graphenes modified by p-type polyaniline show the highest surface tension. Diverse surface adhesive properties to the substrate are also found with various functional groups. The different viscoelasticities of graphene inks were related to the microscopic Structure of their coating layer and subsequently related to the configuration, chemistry and molecular dimensions of the modifying molecules to establish the Property-Structure relationship. Modifications of graphene inks made from chemical reduction cannot only enable cost-effective processing for printable electronics but also extend the applications into, for example, self-assembly of graphene via bottom-up nano-architecture and surface energy engineering of the graphenes. To fabricate useful devices, understanding the surface properties of graphene inks is very important. It is the first paper of this kind to study the surface tension and adhesion of graphene influenced by different functional groups.
Di Wei - One of the best experts on this subject based on the ideXlab platform.
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Properties of graphene inks stabilized by different functional groups
Nanotechnology, 2011Co-Authors: Di Wei, Chris Bower, Piers Andrew, Huafeng Yang, Dongxue Han, Li Niu, Qixian Zhang, Hongwei Li, Tapani RyhanenAbstract:Different graphene inks have been synthesized by chemical methods. These uniform dispersions were stabilized by various functional groups such as room temperature ionic liquid, polyaniline, polyelectrolyte (poly[2,5-bis(3-sulfonatopropoxy)-1,4-ethynylphenylene-alt-1,4-ethynylphenylene] sodium salt) and poly(styrenesulfonate) (PSS). The dispersions can be easily cast into high-quality, free-standing films but with very different physiochemical properties such as surface tension and adhesion. SEM and AFM methods have been applied to have a detailed study of the properties of the inks. It is found that graphenes modified by p-type polyaniline show the highest surface tension. Diverse surface adhesive properties to the substrate are also found with various functional groups. The different viscoelasticities of graphene inks were related to the microscopic Structure of their coating layer and subsequently related to the configuration, chemistry and molecular dimensions of the modifying molecules to establish the Property-Structure relationship. Modifications of graphene inks made from chemical reduction cannot only enable cost-effective processing for printable electronics but also extend the applications into, for example, self-assembly of graphene via bottom-up nano-architecture and surface energy engineering of the graphenes. To fabricate useful devices, understanding the surface properties of graphene inks is very important. It is the first paper of this kind to study the surface tension and adhesion of graphene influenced by different functional groups.
Xin Du - One of the best experts on this subject based on the ideXlab platform.
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Hierarchically Structured Porous Films of Silica Hollow Spheres via Layer-by-Layer Assembly and Their Superhydrophilic and Antifogging Properties
ChemPhysChem, 2008Co-Authors: Xin Du, Junhui HeAbstract:: Raspberrylike organic/inorganic composite spheres are prepared by stepwise electrostatic assembly of polyelectrolytes and silica nanoparticles onto monodisperse polystyrene spheres. Hierarchically Structured porous films of silica hollow spheres are fabricated from these composite spheres by layer-by-layer assembly with polyelectrolytes followed by calcination. The morphologies of the raspberrylike organic/inorganic composite spheres and the derived hierarchically Structured porous films are observed by scanning and transmission electron microscopy. The surface properties of these films are investigated by measuring their water contact angles, water-spreading speed, and antifogging properties. The results show that such hierarchically Structured porous films of silica hollow spheres have unique superhydrophilic and antifogging properties. Finally, the formation mechanism of these nanoStructures and Property-Structure relationships are discussed in detail on the basis of experimental observations.
Qixian Zhang - One of the best experts on this subject based on the ideXlab platform.
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Properties of graphene inks stabilized by different functional groups
Nanotechnology, 2011Co-Authors: Di Wei, Chris Bower, Piers Andrew, Huafeng Yang, Dongxue Han, Li Niu, Qixian Zhang, Hongwei Li, Tapani RyhanenAbstract:Different graphene inks have been synthesized by chemical methods. These uniform dispersions were stabilized by various functional groups such as room temperature ionic liquid, polyaniline, polyelectrolyte (poly[2,5-bis(3-sulfonatopropoxy)-1,4-ethynylphenylene-alt-1,4-ethynylphenylene] sodium salt) and poly(styrenesulfonate) (PSS). The dispersions can be easily cast into high-quality, free-standing films but with very different physiochemical properties such as surface tension and adhesion. SEM and AFM methods have been applied to have a detailed study of the properties of the inks. It is found that graphenes modified by p-type polyaniline show the highest surface tension. Diverse surface adhesive properties to the substrate are also found with various functional groups. The different viscoelasticities of graphene inks were related to the microscopic Structure of their coating layer and subsequently related to the configuration, chemistry and molecular dimensions of the modifying molecules to establish the Property-Structure relationship. Modifications of graphene inks made from chemical reduction cannot only enable cost-effective processing for printable electronics but also extend the applications into, for example, self-assembly of graphene via bottom-up nano-architecture and surface energy engineering of the graphenes. To fabricate useful devices, understanding the surface properties of graphene inks is very important. It is the first paper of this kind to study the surface tension and adhesion of graphene influenced by different functional groups.
