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Ge Wang - One of the best experts on this subject based on the ideXlab platform.

  • Surface Functionalization engineering driven crystallization behavior of polyethylene glycol confined in mesoporous silica for shape stabilized phase change materials
    Nano Energy, 2016
    Co-Authors: Jingjing Wang, Mu Yang, Hongyi Gao, Wenju Dong, Ge Wang
    Abstract:

    Abstract Crystallization behaviors of organic phase change materials (PCMs) confined in porous supports, which are determined by the interactions between PCM molecules and channel Surface of the supports, are a prerequisite for the storage and release of latent heat in PCMs. In this work, Surface Functionalization was engineered to regulate the interactions between a PCM of polyethylene glycol (PEG) and internal/external Surfaces of a support of SBA-15 and the crystallization/stabilization behavior of PEG, and yield desirable thermal properties of the PEG confined in SBA-15 channels. To investigate the effect of the internal/external Surfaces of SBA-15 on the crystallization/stabilization behavior of PEG, SBA-15 supports were modified with various functional terminals, such as NH 2 -SBA-15-NH 2 and NH 2 -SBA-15-CH 3 . The fusion enthalpy was increased from 0 J/g of PEG/HO-SBA-15-OH composite to 88.2 J/g of PEG/NH 2 -SBA-15-CH 3 composite. The amino groups modified on the internal Surface of SBA-15 reduced the hydrogen bond interactions between PCM molecules and the channel Surface of the supports, and also altered the adsorption conformation of the PEG chains from train structure to loop structure, which is conducive to the stretching and crystallization of the PEG chains. Further, the methyl groups grafted on the external Surface of SBA-15 restrained the spillover of PEG molecules from the channels due to the opposite polarities of PEG molecules and methyl groups. Crystallization behavior of the PEG molecules in channels of SBA-15 driven by Surface Functionalization engineering yields a controllable phase change enthalpy of PEG/SBA-15 composite and provides a general approach for the controlling of the thermal properties of PCMs.

  • Surface Functionalization engineering driven crystallization behavior of polyethylene glycol confined in mesoporous silica for shape stabilized phase change materials
    Nano Energy, 2016
    Co-Authors: Jingjing Wang, Mu Yang, Yunfeng Lu, Wenjun Dong, Ge Wang
    Abstract:

    Abstract Crystallization behaviors of organic phase change materials (PCMs) confined in porous supports, which are determined by the interactions between PCM molecules and channel Surface of the supports, are a prerequisite for the storage and release of latent heat in PCMs. In this work, Surface Functionalization was engineered to regulate the interactions between a PCM of polyethylene glycol (PEG) and internal/external Surfaces of a support of SBA-15 and the crystallization/stabilization behavior of PEG, and yield desirable thermal properties of the PEG confined in SBA-15 channels. To investigate the effect of the internal/external Surfaces of SBA-15 on the crystallization/stabilization behavior of PEG, SBA-15 supports were modified with various functional terminals, such as NH2-SBA-15-NH2 and NH2-SBA-15-CH3. The fusion enthalpy was increased from 0 J/g of PEG/HO-SBA-15-OH composite to 88.2 J/g of PEG/NH2-SBA-15-CH3 composite. The amino groups modified on the internal Surface of SBA-15 reduced the hydrogen bond interactions between PCM molecules and the channel Surface of the supports, and also altered the adsorption conformation of the PEG chains from train structure to loop structure, which is conducive to the stretching and crystallization of the PEG chains. Further, the methyl groups grafted on the external Surface of SBA-15 restrained the spillover of PEG molecules from the channels due to the opposite polarities of PEG molecules and methyl groups. Crystallization behavior of the PEG molecules in channels of SBA-15 driven by Surface Functionalization engineering yields a controllable phase change enthalpy of PEG/SBA-15 composite and provides a general approach for the controlling of the thermal properties of PCMs.

Jingjing Wang - One of the best experts on this subject based on the ideXlab platform.

  • Surface Functionalization engineering driven crystallization behavior of polyethylene glycol confined in mesoporous silica for shape stabilized phase change materials
    Nano Energy, 2016
    Co-Authors: Jingjing Wang, Mu Yang, Hongyi Gao, Wenju Dong, Ge Wang
    Abstract:

    Abstract Crystallization behaviors of organic phase change materials (PCMs) confined in porous supports, which are determined by the interactions between PCM molecules and channel Surface of the supports, are a prerequisite for the storage and release of latent heat in PCMs. In this work, Surface Functionalization was engineered to regulate the interactions between a PCM of polyethylene glycol (PEG) and internal/external Surfaces of a support of SBA-15 and the crystallization/stabilization behavior of PEG, and yield desirable thermal properties of the PEG confined in SBA-15 channels. To investigate the effect of the internal/external Surfaces of SBA-15 on the crystallization/stabilization behavior of PEG, SBA-15 supports were modified with various functional terminals, such as NH 2 -SBA-15-NH 2 and NH 2 -SBA-15-CH 3 . The fusion enthalpy was increased from 0 J/g of PEG/HO-SBA-15-OH composite to 88.2 J/g of PEG/NH 2 -SBA-15-CH 3 composite. The amino groups modified on the internal Surface of SBA-15 reduced the hydrogen bond interactions between PCM molecules and the channel Surface of the supports, and also altered the adsorption conformation of the PEG chains from train structure to loop structure, which is conducive to the stretching and crystallization of the PEG chains. Further, the methyl groups grafted on the external Surface of SBA-15 restrained the spillover of PEG molecules from the channels due to the opposite polarities of PEG molecules and methyl groups. Crystallization behavior of the PEG molecules in channels of SBA-15 driven by Surface Functionalization engineering yields a controllable phase change enthalpy of PEG/SBA-15 composite and provides a general approach for the controlling of the thermal properties of PCMs.

  • Surface Functionalization engineering driven crystallization behavior of polyethylene glycol confined in mesoporous silica for shape stabilized phase change materials
    Nano Energy, 2016
    Co-Authors: Jingjing Wang, Mu Yang, Yunfeng Lu, Wenjun Dong, Ge Wang
    Abstract:

    Abstract Crystallization behaviors of organic phase change materials (PCMs) confined in porous supports, which are determined by the interactions between PCM molecules and channel Surface of the supports, are a prerequisite for the storage and release of latent heat in PCMs. In this work, Surface Functionalization was engineered to regulate the interactions between a PCM of polyethylene glycol (PEG) and internal/external Surfaces of a support of SBA-15 and the crystallization/stabilization behavior of PEG, and yield desirable thermal properties of the PEG confined in SBA-15 channels. To investigate the effect of the internal/external Surfaces of SBA-15 on the crystallization/stabilization behavior of PEG, SBA-15 supports were modified with various functional terminals, such as NH2-SBA-15-NH2 and NH2-SBA-15-CH3. The fusion enthalpy was increased from 0 J/g of PEG/HO-SBA-15-OH composite to 88.2 J/g of PEG/NH2-SBA-15-CH3 composite. The amino groups modified on the internal Surface of SBA-15 reduced the hydrogen bond interactions between PCM molecules and the channel Surface of the supports, and also altered the adsorption conformation of the PEG chains from train structure to loop structure, which is conducive to the stretching and crystallization of the PEG chains. Further, the methyl groups grafted on the external Surface of SBA-15 restrained the spillover of PEG molecules from the channels due to the opposite polarities of PEG molecules and methyl groups. Crystallization behavior of the PEG molecules in channels of SBA-15 driven by Surface Functionalization engineering yields a controllable phase change enthalpy of PEG/SBA-15 composite and provides a general approach for the controlling of the thermal properties of PCMs.

Mu Yang - One of the best experts on this subject based on the ideXlab platform.

  • Surface Functionalization engineering driven crystallization behavior of polyethylene glycol confined in mesoporous silica for shape stabilized phase change materials
    Nano Energy, 2016
    Co-Authors: Jingjing Wang, Mu Yang, Hongyi Gao, Wenju Dong, Ge Wang
    Abstract:

    Abstract Crystallization behaviors of organic phase change materials (PCMs) confined in porous supports, which are determined by the interactions between PCM molecules and channel Surface of the supports, are a prerequisite for the storage and release of latent heat in PCMs. In this work, Surface Functionalization was engineered to regulate the interactions between a PCM of polyethylene glycol (PEG) and internal/external Surfaces of a support of SBA-15 and the crystallization/stabilization behavior of PEG, and yield desirable thermal properties of the PEG confined in SBA-15 channels. To investigate the effect of the internal/external Surfaces of SBA-15 on the crystallization/stabilization behavior of PEG, SBA-15 supports were modified with various functional terminals, such as NH 2 -SBA-15-NH 2 and NH 2 -SBA-15-CH 3 . The fusion enthalpy was increased from 0 J/g of PEG/HO-SBA-15-OH composite to 88.2 J/g of PEG/NH 2 -SBA-15-CH 3 composite. The amino groups modified on the internal Surface of SBA-15 reduced the hydrogen bond interactions between PCM molecules and the channel Surface of the supports, and also altered the adsorption conformation of the PEG chains from train structure to loop structure, which is conducive to the stretching and crystallization of the PEG chains. Further, the methyl groups grafted on the external Surface of SBA-15 restrained the spillover of PEG molecules from the channels due to the opposite polarities of PEG molecules and methyl groups. Crystallization behavior of the PEG molecules in channels of SBA-15 driven by Surface Functionalization engineering yields a controllable phase change enthalpy of PEG/SBA-15 composite and provides a general approach for the controlling of the thermal properties of PCMs.

  • Surface Functionalization engineering driven crystallization behavior of polyethylene glycol confined in mesoporous silica for shape stabilized phase change materials
    Nano Energy, 2016
    Co-Authors: Jingjing Wang, Mu Yang, Yunfeng Lu, Wenjun Dong, Ge Wang
    Abstract:

    Abstract Crystallization behaviors of organic phase change materials (PCMs) confined in porous supports, which are determined by the interactions between PCM molecules and channel Surface of the supports, are a prerequisite for the storage and release of latent heat in PCMs. In this work, Surface Functionalization was engineered to regulate the interactions between a PCM of polyethylene glycol (PEG) and internal/external Surfaces of a support of SBA-15 and the crystallization/stabilization behavior of PEG, and yield desirable thermal properties of the PEG confined in SBA-15 channels. To investigate the effect of the internal/external Surfaces of SBA-15 on the crystallization/stabilization behavior of PEG, SBA-15 supports were modified with various functional terminals, such as NH2-SBA-15-NH2 and NH2-SBA-15-CH3. The fusion enthalpy was increased from 0 J/g of PEG/HO-SBA-15-OH composite to 88.2 J/g of PEG/NH2-SBA-15-CH3 composite. The amino groups modified on the internal Surface of SBA-15 reduced the hydrogen bond interactions between PCM molecules and the channel Surface of the supports, and also altered the adsorption conformation of the PEG chains from train structure to loop structure, which is conducive to the stretching and crystallization of the PEG chains. Further, the methyl groups grafted on the external Surface of SBA-15 restrained the spillover of PEG molecules from the channels due to the opposite polarities of PEG molecules and methyl groups. Crystallization behavior of the PEG molecules in channels of SBA-15 driven by Surface Functionalization engineering yields a controllable phase change enthalpy of PEG/SBA-15 composite and provides a general approach for the controlling of the thermal properties of PCMs.

Xiangyang Shi - One of the best experts on this subject based on the ideXlab platform.

  • facile hydrothermal synthesis and Surface Functionalization of polyethyleneimine coated iron oxide nanoparticles for biomedical applications
    ACS Applied Materials & Interfaces, 2013
    Co-Authors: Hongdong Cai, Jun Cui, Shihui Wen, Mingwu Shen, Linfeng Zheng, Guixiang Zhang, Xiangyang Shi
    Abstract:

    We report the facile hydrothermal synthesis and Surface Functionalization of branched polyethyleneimine (PEI)-coated iron oxide nanoparticles (Fe3O4–PEI NPs) for biomedical applications. In this study, Fe3O4–PEI NPs were synthesized via a one-pot hydrothermal method in the presence of PEI. The formed Fe3O4–PEI NPs with primary amine groups on the Surface were able to be further functionalized with polyethylene glycol (PEG), acetic anhydride, and succinic anhydride, respectively. The formed pristine and functionalized Fe3O4–PEI NPs were characterized via different techniques. We showed that the sizes of the Fe3O4–PEI NPs were able to be controlled by varying the mass ratio of Fe(II) salt and PEI. In addition, the formed Fe3O4–PEI NPs with different Surface functionalities had good water dispersibility, colloidal stability, and relatively high R2 relaxivity (130–160 1/(mM·s)). Cell viability assay data revealed that the Surface PEGylation and acylation of Fe3O4–PEI NPs rendered them with good biocompatibili...

  • aminopropyltriethoxysilane mediated Surface Functionalization of hydroxyapatite nanoparticles synthesis characterization and in vitro toxicity assay
    International Journal of Nanomedicine, 2011
    Co-Authors: Shige Wang, Shihui Wen, Mingwu Shen, Rui Guo, Xueyan Cao, Jianhua Wang, Xiangyang Shi
    Abstract:

    Background We report on aminopropyltriethoxysilane (APTS)-mediated Surface modification of nanohydroxyapatite with different Surface functional groups for potential biomedical applications. In this study, nanohydroxyapatite covalently linked with APTS (n-HA-APTS) was reacted with acetic anhydride or succinic anhydride to produce neutralized (n-HA-APTS. Ac) or negatively charged (n-HA-APTS.SAH) nanohydroxyapatite, respectively. Nanohydroxyapatite formed with amine, acetyl, and carboxyl groups was extensively characterized using Fourier transform infrared spectroscopy, transmission electron microscopy, (1)H nuclear magnetic resonance spectroscopy, X-ray diffraction, inductively coupled plasma-atomic emission spectroscopy, and zeta potential measurements. Results In vitro 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide colorimetric assay revealed that the slight toxicity of the amine-functionalized n-HA-APTS could be eliminated by post-Functionalization of APTS amines to form acetyl and carboxyl groups. Blood compatibility assessment demonstrated that the negligible hemolytic activity of the pristine nanohydroxyapatite particles did not appreciably change after APTS-mediated Surface Functionalization. Conclusion APTS-mediated Functionalization of nanohydroxyapatite with different Surface groups may be useful for further Functionalization of nanohydroxyapatite with biologically active materials, thereby providing possibilities for a broad range of biomedical applications.

Christopher Barnerkowollik - One of the best experts on this subject based on the ideXlab platform.

  • diels alder reactions for carbon material synthesis and Surface Functionalization
    Polymer Chemistry, 2013
    Co-Authors: Nicolas Zydziak, Basit Yameen, Christopher Barnerkowollik
    Abstract:

    To meet the ever growing demand for carbon nanomaterials with tailored properties, Diels–Alder reactions are emerging as an efficient alternative to other synthetic methods. From an application perspective, the development of convenient Surface Functionalization strategies for carbon nanostructures is of paramount importance. Pristine carbon nanostructures display a natural tendency to undergo Diels–Alder reactions with a range of functional dienes and dienophiles without the need of a catalyst. This has sparked significant scientific interest in exploiting the Diels–Alder reaction as a powerful strategy for their synthesis as well as for their subsequent Surface Functionalization. The present review highlights the remarkable role of Diels–Alder reactions for the synthesis of fullerenes, carbon nanotubes and graphene, and its promise as a facile carbon nanostructure Functionalization strategy with small molecules and polymer chains. A critical overview of the recent developments evidencing the potential of Diels–Alder reactions as an efficient route to carbon based functional materials is presented.

  • diels alder reactions for carbon material synthesis and Surface Functionalization
    Institute for Future Environments; Science & Engineering Faculty, 2013
    Co-Authors: Nicolas Zydziak, Basit Yameen, Christopher Barnerkowollik
    Abstract:

    To meet the ever growing demand for carbon nanomaterials with tailored properties, Diels-Alder reactions are emerging as an efficient alternative to other synthetic methods. From an application perspective, the development of convenient Surface Functionalization strategies for carbon nanostructures is of paramount importance. Pristine carbon nanostructures display a natural tendency to undergo Diels-Alder reactions with a range of functional dienes and dienophiles without the need of a catalyst. This has sparked significant scientific interest in exploiting the Diels-Alder reaction as a powerful strategy for their synthesis as well as for their subsequent Surface Functionalization. The present review highlights the remarkable role of Diels-Alder reactions for the synthesis of fullerenes, carbon nanotubes and graphene, and its promise as a facile carbon nanostructure Functionalization strategy with small molecules and polymer chains. A critical overview of the recent developments evidencing the potential of Diels-Alder reactions as an efficient route to carbon based functional materials is presented. © 2013 The Royal Society of Chemistry.