Interaction of composite fume suppression and odor elimination agents with crumb rubber modified asphalt: Inhibition behavior of volatile organic compounds (VOCs) and inorganic fume.

The production and construction of crumb rubber modified asphalt (RMA) at high temperatures can produce a large amount of toxic fume, which is detrimental to human health and environment. In this study, a series of composite fume suppression and odor elimination agents (CSEAs) with both physical adsorption and chemical capture functions were adopted to reduce the emissions of volatile organic compounds (VOCs) and hydrogen sulfide (H2S). The material composition, microstructure, and specific surface area of CSEA were analyzed by using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and N2 adsorption-desorption isotherm (BET). The inhibitory effects of adding CSEA on toxic fume emissions from RMA at high temperatures were investigated through a combination of fume emission tests, H2S gas detection, gel permeation chromatography (GPC), and gas chromatography-mass spectrometry technology (GC-MS). The adsorption behavior of CSEA on H2S was analyzed through adsorption dynamics. Results showed that the physical and chemical properties of CSEA are stable while chemical adsorption dominates the CSEA's effect on H2S. ZnO and Ca(OH)2 exhibit good crystallization effects on the surface of the carrier by forming mesoporous structures mostly above 3.4 nm in size. The incorporation of CSEA significantly reduced the total emissions of RMA fume and the main components of VOCs in which the average inhibition rate of H2S can reach 44 % at an initial 30 mins.

Effect of Wet Granulation on Tribological Behaviors of Cu-Based Friction Materials.

Because of the excellent thermal conduction, corrosion resistance, and tribological properties, copper-based friction materials (CBFMs) were widely used in airplanes, high-speed trains, and wind power generation. With operating speed continuously increasing, CBFMs are suffering more complicated and extreme working conditions, which would cause abnormal abrasion. This paper presents an experiment to investigate how the tribological behaviors of CBFMs are regulated by granulation technology. Samples were prepared by the method of granulation and cool-pressed sinter. The tribological properties of specimens with different granule sizes were studied. The results showed that granulation could improve the tribological properties of CBFMs. The friction coefficient (COF) increased first and then decreased with increasing granule size. Specimen fabricated with 5-8 mm granules obtained the lowest COF, which was reduced by 22.49% than that made of powders. Moreover, the wear rate decreased first and then increased as granule size increased. The wear rate of samples prepared by granules 3-5 mm was lower than that of all of the other samples. This is because the structured samples prepared by wet granulation can promote the formation of secondary plateaus, which are beneficial for enhancing tribological properties. This makes granulation a promising method for enhancing the tribological performances of CBFMs.

[Study on the spectral properties of gallium-phthalocyanine-chloride doped composite gel glass].

One of the focal topics in the field of phthalocyanine research is its materialization for practical use. The present paper reports the encapsulation of gallium phthalocyanine chloride (GaPcCl) into silica gel glass to make homogeneously doped composite by sol-gel technique. The spectral properties of the composite gel glass were carried out by IR, UV-Vis and fluorescence measurements. The results show that the introduction of GaPcCl doesn't make noteworthy changes in the IR spectra of silica gel glass matrix. The absorption of GaPcCl dimers increases compared with DMF solution. The fluorescence intensity of GaPcCl is greatly enhanced in the composite gel glass.

[Influence of tetrasulfo-substituents on the UV/Vis absorption spectra of phthalocyanine doped sol-gel hybrid].

Nickle phthalocyanine(NiPc) and Nickle tetrasulfo-phthalocyanine (NiTSPc) were introduced respectively into silica gel matrix by sol-gel technique. Composites were produced and their UV/Vis spectra were measured. The results show that the introduction of soluble tetrasulfo-substituents can greatly increase the solubility of phthalocyanine molecule, which is helpful for the steady co-existence of phthalocyanine in sol-gel hybrid and therefore beneficial to the production of homogeneous composite.