摘要 :
We report a chemical approach for the in situ synthesis of conducting polymer-magnetic inorganic nanomaterials with the integration of a high temperature organometallic method and a new microemulsion system containing organic, sur...
展开
We report a chemical approach for the in situ synthesis of conducting polymer-magnetic inorganic nanomaterials with the integration of a high temperature organometallic method and a new microemulsion system containing organic, surfactant and aqueous phases that were established to enable the formation of our host nanocomposite materials. Polypyrrole-based γ-Fe_2O_3 nanocomposites were prepared through this colloidal system. These organic-inorganic nanocomposites were characterized using X-ray diffraction, transmission electron microscopy, thermogravimetric analysis, electrical resistivity and magnetization measurements. It was observed that the blocking temperature increases with increasing the γ-Fe_2O_3 nanocomponent in these samples. The resistivity and the temperature variation of resistivity have also been investigated.
收起
摘要 :
We report a chemical approach for the in situ synthesis of conducting polymer-magnetic inorganic nanomaterials with the integration of a high temperature organometallic method and a new microemulsion system containing organic, sur...
展开
We report a chemical approach for the in situ synthesis of conducting polymer-magnetic inorganic nanomaterials with the integration of a high temperature organometallic method and a new microemulsion system containing organic, surfactant and aqueous phases that were established to enable the formation of our host nanocomposite materials. Polypyrrole-based γ-Fe_2O_3 nanocomposites were prepared through this colloidal system. These organic-inorganic nanocomposites were characterized using X-ray diffraction, transmission electron microscopy, thermogravimetric analysis, electrical resistivity and magnetization measurements. It was observed that the blocking temperature increases with increasing the γ-Fe_2O_3 nanocomponent in these samples. The resistivity and the temperature variation of resistivity have also been investigated.
收起
摘要 :
G-C3N4 has shown great potential in photocatalytic degradation. However, the layered structure of g-C3N4 may prevent the contaminant adhesion in the interlayers, which greatly limited its active surface area for photocatalysis. He...
展开
G-C3N4 has shown great potential in photocatalytic degradation. However, the layered structure of g-C3N4 may prevent the contaminant adhesion in the interlayers, which greatly limited its active surface area for photocatalysis. Herein, a simple and fast hydrothermal process was optimized: with appropriate synthesis temperature, carbon dots dispersed into the interlayer of g-C3N4 without destroying the frame structure, opened the layer distance of g-C3N4, enlarged its surface area by 3.56 times, and enhanced its photoresponse and photoredox capacity significantly. Excellent photocatalytic activities were observed towards organic dyes Rhodamine B (RhB). This work provides a new approach to optimize the layered g-C3N4 via surface area modification, which enhanced the design and fabrication of a g-C3N4-based photocatalyst.
收起
摘要 :
Novel amphiphilic perylene-polyglycidol was successfully prepared for graphene dispersion. The intercalating of polyglycidol into graphene multilayers was achieved via π-π interactions between perylene core and multilayer graphe...
展开
Novel amphiphilic perylene-polyglycidol was successfully prepared for graphene dispersion. The intercalating of polyglycidol into graphene multilayers was achieved via π-π interactions between perylene core and multilayer graphene structure. The hybrid composite exhibits stable dispersion properties in both water and DMF even for over 2 months.
收起
摘要 :
This chapter is an introduction to nanocomposite materials and its classifications with emphasis on orthopedic application. It covers different types of matrix nanocomposites including ceramics, metal, polymer and natural-based na...
展开
This chapter is an introduction to nanocomposite materials and its classifications with emphasis on orthopedic application. It covers different types of matrix nanocomposites including ceramics, metal, polymer and natural-based nanocomposites with the main features and applications in the orthopedic. In addition, it presents structure, composition, and biomechanical features of bone as a natural nanocomposite. Finally, it deliberately presents developing methods for nanocomposites bone grafting.
收起
摘要 :
The C/MnO2 composites were prepared by redox reaction between KMnO4 and the porous carbon derived from sonicated ZIF-8 at room temperature. The C/MnO2 composite has a specific capacitance of 159 F g(-1). The specific capacitance o...
展开
The C/MnO2 composites were prepared by redox reaction between KMnO4 and the porous carbon derived from sonicated ZIF-8 at room temperature. The C/MnO2 composite has a specific capacitance of 159 F g(-1). The specific capacitance of MnO2 in the composite is beyond 193 F g(-1). (C) 2018 Elsevier B.V. All rights reserved.
收起
摘要 :
Mesoporous silica with a pore diameter of around 5 nm was synthesized by a solution technique. Nickel zinc ferrite (NZF) phase was grown within these nanochannels. The dielectric permittivity showed dispersion as a function of fre...
展开
Mesoporous silica with a pore diameter of around 5 nm was synthesized by a solution technique. Nickel zinc ferrite (NZF) phase was grown within these nanochannels. The dielectric permittivity showed dispersion as a function of frequency characteristic of a Maxwell-Wagner capacitor. The nanocomposite exhibited a large magneto-capacitance coefficient of 44% at room temperature at an applied magnetic field of 1.5 T. The dielectric loss of the nanocomposite was fairly low (-0.01). The present strategy of composite synthesis will lead to the preparation of materials having large values of magneto-capacitive coefficients for device applications.
收起
摘要 :
We have established a substantial enhancement of Kerr coefficients for 1150 nm cw He-Ne laser wavelength using BiB_3O_6 (BiBO) nanocrystallites (NC) incorporated into polymer-dispersed liquid crystal composites (PDLC). For this re...
展开
We have established a substantial enhancement of Kerr coefficients for 1150 nm cw He-Ne laser wavelength using BiB_3O_6 (BiBO) nanocrystallites (NC) incorporated into polymer-dispersed liquid crystal composites (PDLC). For this reason we have used 3% and 5.2% in weighting units of BiBO NC possessing sizes varying within the 60-90 nm. It was discovered that BiBO NC may be used for effective gain of Kerr electro-optical susceptibilities varying by the content of the NC at T = 77 K. Moreover, an increase of the Kerr coefficients correlates with decreasing dc-current under applied voltage. The maximally achieved value of the Ken-coefficients were equal to about 1.2·10~(-9)mV~(-2) (A=1150nm) corresponding to BiBO content equal to about 3%. Such polymer nanocomposites may be considered as perspective materials for the electro-optical Kerr modulators.
收起
摘要 :
Abstract 2D materials are a very up‐and‐coming class of additives in the field of polymer composites due to their versatility and exceptional intrinsic properties. This enables researchers to create a variety of nanocomposites t...
展开
Abstract 2D materials are a very up‐and‐coming class of additives in the field of polymer composites due to their versatility and exceptional intrinsic properties. This enables researchers to create a variety of nanocomposites that can be employed in a myriad of emerging multifunctional applications. The performance of such nanocomposites depends heavily on the quality of the 2D materials, their interactions with the polymer matrix, as well as on their dispersion and morphology when embedded in the polymer. In order to control these variables, one needs to choose wisely between the available synthesis techniques and mixing strategies, playing with the process‐structure–property relationships, while keeping in mind the compatibility with current industrial infrastructure. Therefore, this paper presents a brief review on the 2D materials most used in polymer nanocomposites, the main synthesis techniques and mixing routes developed, the state of the art on the most sought‐after properties in different systems, and what are the effects of the morphology evolution. In each section, the main challenges are highlighted, and possible strategies to overcome them are presented, for example, the advent of hybrid 2D nanostructures, which promote synergistic effects, enabling the combination of properties that were not previously achievable on the final material. Finally, the paper ends by presenting a perspective of the current state in the development of these emerging multifunctional nanocomposites and what are the most important steps that need to be taken, not only academically, but also industrially, in order for these materials to start being widely applied and become staples in the daily life of humanity.
收起
摘要 :
Stable ternary powders of Al center dot B center dot I-2 and Mg center dot B center dot I-2 composites of interest for agent defeat applications were prepared by mechanical milling. All powders contained 20 wt.% of iodine. Powder ...
展开
Stable ternary powders of Al center dot B center dot I-2 and Mg center dot B center dot I-2 composites of interest for agent defeat applications were prepared by mechanical milling. All powders contained 20 wt.% of iodine. Powder ignition was characterized using a heated filament experiment. Ignition kinetics was compared to the kinetics of events occurring upon slow heating of these materials in thermo-analytical experiments. Individual particle combustion was studied by seeding the powder into a premixed hydrocarbon-air flame. Both, particle burn times and temperatures were measured optically. Aerosol combustion of the powders was tested in a constant volume explosion chamber. Ignition temperatures for the Mg center dot B center dot I-2 composites were lower than those for the Al center dot B center dot I-2 composites. Iodine release occurring due to the formation of AlB2 and MgB2 was a likely ignition trigger for Al center dot B center dot I-2 and Mg center dot B center dot I-2 composites, respectively. The burn times of these composites were longer than those for pure Al and Mg powders. Burn times for Mg center dot B center dot I-2 particles were shorter than for the same size particles of Al center dot B center dot I-2. Combustion temperatures of the composite powders were lower than those of pure Al and Mg. In aerosol combustion, the rate of pressurization and maximum pressure were inversely proportional to the concentration of boron. The combustion efficiency was expressed through a ratio of the experimental maximum pressure to that predicted by a thermodynamic equilibrium calculation. This efficiency was the same for Al and Al center dot B center dot I-2 composites. The efficiency for Mg center dot B center dot I-2 composites exceeded that of pure Mg. (C) 2016 Elsevier B.V. All rights reserved.
收起
原文获取