51 research outputs found
Bio-inspired self-assembly of waxberry-like core-shell SiO2@TiO2 nanoparticles towards antiglare coatings
No full textWaxberry-like core-shell SiO2@TiO2 nanoparticles were prepared by liquid-phase deposition (LPD) method. The dip-coating self-assembly of waxberry-like core-shell SiO2@TiO2 nanoparticles has been used to fabricate coatings with excellent antiglare properties in the large angle and wide wavelength range. The field emission scanning electron microscopy (SEM) and transmission electron microscopy (TEM) measurements showed that the surface of SiO2 nanoparticles were coated by titania as a shell with controllable and uniform thickness. The ultraviolet visible near-infrared spectrophotometer (UV-Vis-NIR) results indicate that the maximum transmittance of the antiglare coating is up to 95.80% in the visible band, whereas that of the pure glass substrate is only 92.10%. The scattering and haze of the films have been measured to show that such specifically structured coatings exhibited good antiglare properties in the large angle and wide wavelength range
Invulnerability Simulation of Urban Agglomeration Passenger Transport Network under Incomplete Information Attack Strategy
No full textThis paper explores the invulnerability of urban agglomeration transportation network under the incomplete information attack strategy. This approach employed the site mapping method to construct the urban agglomeration composite transportation network model, and the network is weighted based on the actual passenger flow. Then the nodes are defined according to the overload conditions. In addition, based on the capacity-load model, the cascading failure model of the urban agglomeration passenger transport network is constructed, and the incomplete information attack strategy and network invulnerability measure index are determined. Finally, the case of Hu-Bao-E-Yu urban agglomeration is simulated to quantify the effects of attack strategies with varied information level, node load factors, and capacity weight and distance weight of the residual connected edge. The results reveal that the network crash speed is positively related to the information span of the attacker unless the information span exceeds 0.9 or accuracy exceeds 0.6. When the information span is low, the information accuracy δ has a critical impact on the network crash speed. Moreover, in the presence of attack, high or low values of node load factor are conducive to the improvement of network invulnerability. As a scale-free network, urban agglomeration transportation network shows strong robustness to random attacks and exhibits vulnerability to deliberate attacks. The capacity weight value α and distance weight value β of residual connected edge have different effects on the network invulnerability under different information span strategies
Cationic organofluorosilicone as deepening agent in the application of dyed polyester fabric
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Optimal Multi-Mode Flexibility Operation of CHP Units with Electrode Type Electric Boilers: A Case Study
No full textWith the in-depth development of flexibility retrofit in combined heat and power (CHP) units, the unit commitment mode of energy supply equipment in CHP plants is more flexible. This paper presents a multi-mode flexible operation method for CHP plants with electrode electric boilers. Firstly, a simulation model of the operation characteristics of each unit in different operation modes is established, and the corresponding features of electrical and thermal outputs are obtained. Subsequently, a decision-making model of the unit commitment mode of energy supply equipment is set up, and the selection rules of the unit commitment mode of the unit under low heat load, medium heat load, and high heat load are achieved. Finally, under different unit operation combinations, a plant-level optimum load dispatch model is obtained, and the actual operating data of the CHP plant is used for optimization and comparison analysis. The results show that compared to the unit commitment mode of high back pressure and low-pressure cylinder cutting-off (HBP + LPCC), the unit commitment mode of high back pressure and extraction heating (HBP + EH) has more room for energy-saving optimization. Under the premise of safe and reliable operation, the high back pressure (HBP) unit can be loaded as much as possible. While in the combined operating of HBP + EH, the energy-saving space for optimized load dispatching is not large, so a fixed proportion of the electrical load may be considered; under the auxiliary service subsidy policy, the input power of the electric boiler can be appropriately increased; the greater the heat load of the whole plant, the more pronounced the energy-saving effect of optimum load dispatch
Excellent properties of epoxy composite by constructing interlayer support structural fluorinated graphene oxide
No full textThe crimping and aggregation of graphene in the matrix often affect the properties of the composites. Herein, we successfully constructed the fluorinated graphene oxide (FGO) with interlayer support structure to improve the properties of epoxy composites. We employed diamine as a spacer and investigated the effects of three diamines with different structures on the modification of FGO in detail. FGO modified by p-phenylenediamine (PPD-FGO) had maximum interlayer spacing, presenting good stability and antiaggregation properties. Moreover, the addition of PPD-FGO makes epoxy resin composite transform from brittle material to ductile material, and the impact strength was significantly improved at both room temperature and 77 K. Meanwhile, the thermal properties were maintained very well, showing a slight increase. In addition, PPD-FGO/epoxy composite coating displayed good anti-corrosion performance for carbon steel. This work not only provides a new method to improve the properties of epoxy resin but also gives a new direction for the application of FGO.</p
A salt‐free pad‐irradiate‐pad‐steam reactive dyeing process for cotton fabric and the influence of cationising conditions on its coloration
No full textSalt-Free Dyeing of Cotton Fabric Using 3-Chloro-2-Hydroxypropyltrimethyl Ammonium Chloride by Pad-Irradiate-Pad-Steam Process, and Prediction of Its K/S Value by LS-SVM
No full textBased on conventional pad-dry-pad-steam (PDPS) process, 3-chloro-2-hydroxypropyltrimethylammonium chloride was used as an etherifying agent to cationize cotton by the pad-irradiate process by microwave and then the cationized fabric was salt-free dyed by the pad-steam process. The results showed that the dyeability of the cationized fabric with salt-free reactive dye was nearly equivalent with conventional PDPS process. This study also developed a model to predict K/S value of dyed cotton fabric based on least squares support vector machine (LS-SVM). The simulation results based on actual run data demonstrated that the model using LS-SVM has high prediction accuracy and can be employed to predict the K/S value of dyed fabric using pad-irradiate-pad-steam process
Preparation of Modified Fluorographene Oxide with Interlayer Supporting Structure
No full textFluorinated graphene (FGi) is easy to agglomerate, after which it turns into a curly and wavy shape, which results in a great decrease in the properties of the resultant composite materials and coatings. In this study, fluorinated graphene oxide (FGO) modified with p-phenylenediamine (PPD) was prepared, but with a view to avoid its agglomeration and retain a sheet-like structure. Through the reaction between PPD and the epoxy groups of FGO, the modified FGO with an amino group (N-PGO) had a larger interlayer d-spacing than FGO. The stability of N-PGO was also improved, and nitrogen, fluorine, oxygen, and carbon were evenly distributed in the N-PGO sheets. All the results indicate that PPD can act as an effective spacer to separate graphene sheets for good anti-agglomeration properties. This method produced modified graphene with fluorine, amino, and carbonyl groups. It shows potential in introducing N-PGO as a reactive modifier in composite materials and coatings for a variety of industrial applications including waterborne epoxy materials
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