MICROCHIMICA ACTA
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2018
·Vol. 185
·期 2
·1-8
·
IF 5.705
Yang Kunhao,Pan Long,Gong Lingling,Liu Qingju,Li Zhongqiu,Wu Li,He Yujian
A highly selective method is described for the colorimetric determination of Au(III) ions in acidic solution using gold nanoparticles (AuNPs) functionalized with thiolated methoxy poly(ethylene glycol) (mPEG). The presence of Au(III) induces the aggregation of the PEG-AuNPs, and this is accompanied by a color change from wine red to blue, and a decrease in absorbance at 525 nm. This can be monitored spectrophotometrically and visually. Absorbance at 525 nm linearly drops in the 0.50 to 1.75 mg·L −1 Au(III) concentration range, with a 0.25 mg·L −1 detection limit. The method is surprisingly selective over other metal ions. It was successfully applied to the analysis of ore samples.
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Journal of Coatings Technology and Research
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2018
·Vol. 15
·期 5
·993-1002
·
IF 1.619
Yong Qiwen,Liao Bing,Ying Guo,Caizhen Liang,Huang Hao,Pang Hao
This paper reports on a novel self-matte or bulk-matte waterborne polyurethane coating composite with inherently extremely low gloss. The coating composite was comprised of a siloxane-containing waterborne polyurethane (SPU) resin and a crosslinked waterborne polyurethane (CPU) resin. The CPU resin was mainly responsible for fabricating the micro-rough surface of the film, which was achieved by a crosslinking reaction between the waterborne polyurethane and bisphenol A-type epoxy E-44 resin. The SPU resin was used to improve the comprehensive properties of the film, which was ascribed to the addition of silane coupling agent KH792. Compared with traditional matte coatings, this coating composite made it possible to avoid high loadings of matting agent and to arrive at highly flexible low-gloss finishes. Gloss levels of as low as a few tenths of a percent, even at high incidence angles, have been achieved with zero loading of extraneous dulling agent. The chemical structures of the SPU and CPU resins were characterized by FTIR-ATR and NMR spectra. The micro-rough topographies and surface rough degrees of the SPU, CPU and their 50%/50% composite films were measured by SEM and MSP, respectively. The particle sizes and particle morphologies of the SPU and CPU resins were imaged by TEM. Finally, the comprehensive properties of the SPU, CPU and their 50%/50% composite resins were evaluated, including the water contact angle, film transparency, tensile strength and storage stability.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2018
·Vol. 25
·期 8
·7834-7843
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IF 2.8
Yang Hang,Zhang Li,Hou Guangying,Liu Chunguang
As an alternative to bisphenol A, bisphenol S (BPS) is widely used in industrial production and daily life, which is then discharged into sewage treatment plants and accumulates in sludge. In this research, impact and interaction mechanism of BPS on lipids hydrolysis in sludge is studied from the respect of soluble organic matter and volatile organic fatty acids (VFAs). Multi-spectra, thermodynamics, molecule docking, and enzyme activity assay are applied to elucidate the effect mechanism of BPS on lipids hydrolysis. Results show that lipids hydrolysis is restrained due to the denaturation of lipase with BPS exposure. The interaction mechanism is involved in hydrophobic bond and hydrogen bond interaction in the activity region of lipase. This interaction not only results in an unfolding skeleton structure of lipase and a less hydrophobic microenvironment of tyrosine and tryptophan residues but also leads to fluorophore static quenching with the formation of lipase-BPS complex. The experimental results and the combined research methods not only contribute to the development of novel technique for sludge treatment containing micropollutant but also profit to clarify the interaction mechanism between other micropollutant and enzymes.
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JOURNAL OF ELECTRONIC MATERIALS
·
2018
·Vol. 47
·期 12
·7514-7519
·
IF 1.566
Zhu Z.,Zhang Y. W.,Song H. Z.,Li X. J.
Cu 1.98− x Na x Se nanopowders were synthesized using a hydrothermal method and hot-pressed into bulk pellets to assess the effects of Na doping on the thermoelectric properties of Cu 1.98 Se. The original layered microstructure was maintained at low doping levels, although nanopores, together with point defects, appeared to decrease the thermal conductivity. The thermoelectric properties of the material were improved by Na doping, resulting in a maximum ZT value of 1.32 for Cu 1.94 Na 0.04 Se at 973 K. The experimental data indicate that an optimal level of Na doping effectively improves the thermoelectric performance of non-stoichiometric Cu 1.98 Se.
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Environmental Earth Sciences
·
2018
·Vol. 77
·期 12
·1-10
·
IF 1.435
Wang Jing,Wen Xin,Yang Fan,Cao Zhanfang,Wang Shuai,Zhong Hong
A novel two-dimensional carbon material using phytic acid-functionalized graphene oxide was successfully synthesized by a simple hydrothermal method. Properties of the material were characterized by SEM, FT-IR, FITR-Rama and BET. Some factors like contact time, pH, and temperature were studied to investigate the adsorption characteristics on Cu(II) ions of the material. Experiment results showed that the material can reach equilibrium adsorption in 20 min and get maximum adsorption capacity (316.586 mg g) under the condition of pH 4.0, 304 K. The adsorption of Cu(II) ions was an exothermic and spontaneous process, and could be better simulated by the pseudo-second-order kinetics and Freundlich isotherm model.
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Nature Communications
·
2018
·Vol. 9
·期 1
·1-11
·
IF 12.353
Mo Jianbin,Xie Qingyun,Wei Wei,Zhao Jing
The increasing number of biological applications for black phosphorus (BP) nanomaterials has precipitated considerable concern about their interactions with physiological systems. Here we demonstrate the adsorption of plasma protein onto BP nanomaterials and the subsequent immune perturbation effect on macrophages. Using liquid chromatography tandem mass spectrometry, 75.8% of the proteins bound to BP quantum dots were immune relevant proteins, while that percentage for BP nanosheet–corona complexes is 69.9%. In particular, the protein corona dramatically reshapes BP nanomaterial–corona complexes, influenced cellular uptake, activated the NF-κB pathway and even increased cytokine secretion by 2–4-fold. BP nanomaterials induce immunotoxicity and immune perturbation in macrophages in the presence of a plasma corona. These findings offer important insights into the development of safe and effective BP nanomaterial-based therapies.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 22
·19578-19587
·
IF 2.324
Liu Chuanmei,Xu Jiangtao,Liu Zhengqin,Ning Xin,Jiang Shouxiang,Miao Dagang
In this study Ti/Ag/Ti tri-layer and Ti–Ag alloy films were deposited on the surfaces of polyethylene terephthalate (PET) fabrics by multi-target magnetron sputtering system to fabricate highly electro-conductive textiles. Before sputtering, the fabric was treated by polyacrylic acid ester (PA) to form a continuous surface on the surface of PET fabric by padding method. The as-fabricated fabrics were characterized by scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectrometer. And the physical properties of the coated fabrics were evaluated by electrical conductivity, contact angle (CA), flexibility and adhesion. At last, a simple electric circuit was made with the as-treated fabric to evaluate the electrical property and explore its application further. The results of the study revealed that pretreatment with PA could form a continuous film on the surface of PET fabric. The PA-coated PET fabric with Ti/Ag/Ti fabric exhibited excellent electrical property whose electrical resistivity was only 5.1 × 10 −7 Ω m, CA of 137°. The PA-coated PET fabric with Ti–Ag alloy film exhibited a rather lower electrical resistivity of 3.4 × 10 −7 Ω m, CA of about 130°. Moreover, the samples retain ideal flexibility and adhesion. Therefore this study can broaden the application area of magnetron sputtering on discontinuous surface to fabricate electrical conductive fabric. And due to the excellent electro-conductivity, this kind of fabric will be a promising material for smart textiles.
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MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 7
·1-7
·
IF 5.705
Liu Qingju,Han Ping,Gong Wenwen,Wang Hui,Feng Xiaoyuan
A method is described for the determination of the pesticide chlorothalonil (CLT). It is based on the finding that citrate-capped gold nanoparticles (AuNPs) undergo aggregation on exposure to chlorothalonil. This is accompanied by a visually detectable color change from wine red to blue. The effect is due to the interaction of the cyano group of chlorothalonil with gold nanoparticles. The assay may also be performed by using a spectrometer. The ratio of absorbances at 700 nm and 520 nm (A 700 /A 520 ) linearly drops in the 5 to 100 ng·mL −1 CLT concentration range, with a 3.6 ng·mL −1 detection limit. This is below the Chinese guideline value for cucumber. The method is rather simple and does not require any modification of the AuNPs or the utilization of antibody. It was successfully applied to the determination of CLT in (spiked) cucumber samples. Recoveries ranged from 80.4 to 97.4%, and the analytical results compared well with those obtained by HPLC.
Schematic of the assay. The strong interaction of the cyano group of acetamiprid with gold nanoparticles (AuNPs) via Au-N bond induces the aggregation of gold nanoparticles, and this is accompanied by a color change from red to purple.
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2018
·Vol. 135
·期 4
·2297-2308
·
IF 2.209
Chen Qinpei,Wang Xuehui,Zhou Tiannian,Ding Chao,Wang Jian
In this study, a series of ethanol–water mixture and Chinese liquor combustion experiments were conducted using an ISO5660-1 cone calorimeter and an automatic flash point tester. The main purpose was to obtain key fire parameter data, including the burning duration, mass loss rate, mass loss rate per unit area, heat release rate per unit area, CO and CO 2 volume fraction, CO 2 /CO ratio and closed-cup flash point. At the same time, the experimental differences between Chinese liquor and ethanol–water mixture were analyzed. Also, the fire risk classification was discussed based on the code of GB 50016-2014. When the ethanol volume fraction of Chinese liquor is greater than 34.8 vol%, the fire risk is the most dangerous level, Class I. While the critical ethanol volume fraction of ethanol–water mixture is 38.9 vol%, it needs to pay more attention to the fire safety of Chinese liquor storage and usage when the ethanol volume fraction is generally from 30 to 65 vol%.
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JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 23
·15927-15938
·
IF 2.993
Xun Suhang,Hou Caozheng,Li Hongping,He Minqiang,Ma Ruliang,Zhang Ming,Zhu Wenshuai,Li Huaming
The catalyst of WO 3 highly dispersed on mesoporous ZrO 2 was prepared by hydrothermal treatment and calcination. Ionic liquid templates with different cations and various calcination temperatures were taken into account to investigate factors that affect the structure of the catalysts. Wide-angle XRD, Raman, low-angle XRD, N 2 adsorption–desorption, SEM, EDS-mapping and TEM analyses were employed to characterize the composition, morphology and the dispersion of WO 3 . It was found that [C 16 H 33 N(CH 3 ) 3 ] 4 SiW 12 O 40 and 700 °C were the optimal ionic liquid template and calcination temperature; the obtained catalyst, expressed as 700-C 16 -WO 3 /ZrO 2 , exhibited the best catalytic activity in oxidation desulfurization. Dibenzothiophene (DBT) in the model oil could be oxidized to DBT sulfone (DBTO 2 ) completely, certified by GC-MS analysis, under optimum conditions. The oxidative desulfurization efficiencies of different substrates catalyze by 700-C 16 -WO 3 /ZrO 2 , and the cycle performance on the oxidation of DBT were studied.
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FIBERS AND POLYMERS
·
2018
·Vol. 19
·期 7
·1363-1372
·
IF 1.353
Fu Yifan,Teng Yun,Yu Guomin,Yin Cuiyu
Unmodified polyamide 6 commonly dyed with acid dyes, and has no flame-retarded properties. So they are flammable and can be easily stained by foods or drinks that contain acid dyes. However, the acid groups react with amino groups that existed at the end of PA6 chain while using cationic dyes. Thus, the acid dyes can be washed immediately. In this study, the flame retardant and cationic dyeable polyamide 6 (FRCD-PA6) modified with 5-sulfoisophthalic acid sodium (5-SSIPA) and melamine cyanurate (MCA) was successfully prepared by the two-step-melt polymerization method. Firstly, cationic dyeable polyamide 6 (CD-PA6) was prepared with sodium salt from 5-sulfoisphthalic acid. Secondly, melamine cyanurate, as an efficient flame retardant, was blended into the reaction. The chemical and crystalline structures of FRCDPA6 were characterized by the Fourier transform infrared spectroscopy (FT-IR) and wide angle X-ray diffraction (XRD). Their thermal properties were tested by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA), and morphology was analyzed by SEM, respectively. It had been measured to prove the dispersion of 5-SSIPA and MCA on polyamide 6 matrix. Incorporating with 5-SSIPA created more amorphous regions and rose up the dyeing rate easily, with a highest dyeing rate for about 96.79 %. The effect of varying MCA content on the composites showed more flame retardant and made better heat-resistance. Moreover, with the appropriate addition of MCA content, the limit oxygen index (LOI) reached up to 27, less smoking, no more black smoke, droplet phenomenon was slightly, and flame resistance had greatly improved. Because of the good synergy between 5-SSIPA and MCA, a kind of novel modified polyamide 6 which own both cationic dyeable and efficient flame retardant properties was born.
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POLYMER BULLETIN
·
2018
·Vol. 76
·期 3
·1081-1097
·
IF 1.589
Chen Youning,Zhao Wei,Yang Xiaoling,Li Yuhong
Using SI-ATRP technique, 1-vinylimidazole (VI) monomer was directly modified onto the surface of CMPS resin to prepare a chelating resin (PVI-g-PS) with imidazole ring as functional group. The adsorption properties of Cd(II), Ni(II), Pb(II) and Cu(II) were studied. It was found that with the increase in ATRP time and the amount of VIM, the graft ratio of VIM increased linearly, which indicated that the density of imidazole ring on the surface of resin increased. Adsorption experiments showed that the resin has good adsorption properties for Cd(II), Ni(II), Pb(II) and Cu(II). At pH 5.0, the static saturated adsorption amount of PVIM-g-PS for Cd(II), Ni(II), Pb(II) and Cu(II) was 2.82, 1.77, 1.22 and 0.83 mmol g −1 , respectively. The adsorption model could be described by Langmuir isothermal adsorption and the adsorption process accorded with quasi-first-order kinetic equation. In addition, the resin has good desorption rate and reusability. These findings suggest that the resin can be potentially applied to the efficient removal of heavy metal ions from wastewater.
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