TRIBOLOGY LETTERS
·
2017
·Vol. 66
·期 1
·1-18
·
IF 1.891
Xin Yuanshi,Xu Fanglin,Wang Mingming,Li Tongsheng
Modified carbon nanotube/nano-MoS 2 (CMS) hybrid as a self-lubricating and anti-wear nanofiller was prepared through chemical compounding and then incorporated into polyimide (PI) matrix to yield CMS/PI composite by in situ polymerization. For comparison, carbon nanotube (CNT), nano-MoS 2 as well as the mixture of them (CNT-MoS 2 ) were also incorporated into PI matrix separately to evaluate the superior performance of CMS hybrid. Morphology, mechanical capacity and tribological behavior of the as-prepared nanocomposites were investigated, and the discrepancies on the above-mentioned properties caused by the different structures between CMS hybrid and CNT-MoS 2 mixture were discussed in detail. With only 0.5 wt% addition of CMS, the friction coefficient and wear rate of CMS/PI composite decreased by 31 and 84%, respectively, compared to virgin PI. The results showed that the combinational structure of CMS hybrid, as CNT-coated few-layer MoS 2 nanosheet, which took the advantage of both CNT and nano-MoS 2 , contributed to the synergistic effect on the tribological properties.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2012
·Vol. 29
·期 10
·1388-1392
·
IF 0.991
He Minqiang,Pan Aixia,Xie Jimin,Li Huamin,Yuan Xinhua,Cheng Xiaonong,Chen Min
A novel one-pot catalytic synthesis of 1-benzoylpyrene through acylation of pyrene with benzoic anhydride catalyzed by several heteropoly acids (HPAs) was investigated. Pure 1-benzoylpyrene was obtained and its structure was identified by GC/MS, FT-IR and 1 H NMR spectra. Silica-supported phosphotungstic heteropoly acid (PW/SiO 2 ) was found to be the most active catalyst in the acylation. The yield and the selectivity of 1-benzoylpyrene were up to 62.5% and 100%, respectively. The effects of experimental parameters on the catalytic acylation reaction, and the possibility of reusability of PW/SiO 2 catalyst were studied. PW/SiO 2 catalyst is easily separable from the reaction mixture and reusable without loss of its activity.
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MICROCHIMICA ACTA
·
2019
·Vol. 187
·期 1
·1-8
·
IF 5.479
Liang Yutao,He Juan,Huang Zhipeng,Li Huayu,Zhang Yunxia,Wang Huige,Rui Chaofan,Li Yuanyuan,You Liqin,Li Kai,Zhang Shusheng
A surface imprinted polymer of type UiO-66-NH2@MIP was prepared by combining molecular imprinted polymers (MIPs) and an amino-functionalized zirconium-based metal-organic framework. Quercetin is used as the virtual template, UiO-66-NH 2 acts as the carrier to which the monomer acrylamide can be copolymerized. The material was characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. It was used as a sorbent in a solid-phase extraction column. The extraction conditions were optimized. The adsorption capacities for aflatoxins AFB1, AFB2, AFG1 and AFG2 by this SPE and by the commercial SPE were compared. The method was successfully applied to quantify the aflatoxins in grain. Figures of merit include (a) good linearity (range from 0.20–45 μg·kg −1 ) with R 2 (range from 0.9986–0.9994), (b) low detection limits (90–130 ng·kg −1 ), (c) acceptable reproducibility (1.0–5.9%; for n = 6), and (d) relatively satisfactory recovery rates (74.3–98.6%). The new sorbent has good selectivity and reusability.
UiO-66-NH 2 @MIPs were synthesized with modified UIO-66-NH 2 as core and quercetin as pseudo template. A cartridge was prepared with the polymers as the sorbent, and its performance was compared with different commercial SPE cartridges.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 24
·21177-21184
·
IF 2.195
Zheng Jiahong,Cheng Kangkang,Yu Pengfei
A simple fluorescence sensor for the detection of sulfadimidine (SM 2 ) was fabricated by molecular imprinting technology. Cadmium telluride quantum dots (CdTe QDs) as the fluorescent material, 3-aminopropyltriethoxysilane (APTES) as functional monomer, sulfadimidine as template molecule and tetraethoxysilane (TEOS) as cross-linker, the CdTe QDs were embedded in silica nano-particles by reverse microemulsion method. Under optimal detection condition, response is linear in the 2–30 μmol L −1 SM 2 concentration condition with the detection limit was 0.4 μmol L −1 . In addition, the correlation coefficient was 0.9857 and the imprinting factor was 4.82. The fluorescent probe was successfully applied to the determination of SM 2 in tap water and milk sample with the spiked recoveries ranging from 99.8 to 103.2%. It gets a good specific recognition ability and potential practical application value.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 24
·22297-22311
·
IF 2.22
Guan Yiyin,Liu Wenjie,Zuo Shixiang,Yuan Kun,Wu Fengqin,Ji Jinjin,Yao Chao
In this paper, rutile phase titanium oxide/Sb-SnO 2 /anatase phase titanium oxide (TiO 2 (R)/C-TiO 2 (A)) heterostructured nanocomposites were prepared by a sol–gel method and a hydrothermal method. By optimizing the mass ratio between TiO 2 (R) and C-TiO 2 (A), the rod-ball heterostructures of TiO 2 (R)/C-TiO 2 (A) were formed and exhibited enhanced simulated sunlight-driven photocatalytic desulfurization performance. According to the results, the desulfurization rate of TiO 2 (R)/C-TiO 2 (A) was 93.98% after 60 min, which is higher than C-TiO 2 (A) and TiO 2 (R)/TiO 2 (A). In addition, the photocatalytic recyclability test indicated that after three times the reuse of TiO 2 (R)/C-TiO 2 (A) could still reach 85.98%. The enhanced photocatalytic performance could be attributed to the double Z-scheme heterojunction in the TiO 2 (R)/C-TiO 2 (A) and the uniformly structure of rod array, which resulted in the higher separation efficiency of electrons and holes. Furthermore, the results of photocatalytic active radical species trapping experiments showed that the main substances in the photocatalytic reaction are ∙O 2 − and h + . This paper also established the double Z-scheme heterojunction reaction mechanism.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2018
·Vol. 86
·期 2
·431-440
·
IF 1.745
Sun Xi,Ma Jingtao,Chen Xiaotong,Li Ziqiang,Deng Changsheng,Liu Bing
ZrC–ZrO 2 composite ceramic microspheres were prepared by internal gelation combined with carbothermic reduction using fructose as a chelating agent and carbon source. Fructose in the precursor solution formed complex with zirconium ions, which was conducive to the refining of the microstructure of the sintered composite. ZrC–ZrO 2 composite with ZrC content as high as 60 wt% could be prepared.
In this paper, fructose was used as a chelating agent and an organic carbon source to prepare ZrCO microspheres by internal gelation and carbothermic reduction. The fructose in the precursor solution could form complex with zirconium ions, which was conducive to the refining of the microstructure of the sintered composite. ZrC–ZrO 2 composite with crystal size of ZrO 2 and ZrC in nanometer range and ZrC content as high as 60 wt% could be successfully prepared.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2021
·Vol. 327
·期 1
·565-573
·
IF 1.371
Chen Qi,Lu Chuan,Hu Yifu,Liu Yaoyang,Zhou Yu,Jiao Caishan,Zhang Meng,Hou Hongguo,Gao Yang,Tian Guoxin
The extraction behavior of several lanthanide ions (La(III), Nd(III), Sm(III), Gd(III), Yb(III)) from the nitric acid medium using ionic liquid [C 4 mim][NTf 2 ] solvent containing N,N’-dimethyl-N,N’-dioctyl-3-oxadiglycolamide (DMDODGA) was studied. The effects of the concentration of HNO 3 , H + and NO 3 − in aqueous phase, as well as the DMDODGA concentration and temperature on the distribution ratio of Ln(III) were analyzed. The distribution ratio of lanthanide ions into [C 4 mim][NTf 2 ] is much higher than that reported for aliphatic hydrocarbon diluents. The extraction mechanism was demonstrated to agree with the cation-exchange mechanism. The stoichiometric ratio of Ln (III)/DMDODGA complex is 1:3 or 1:4.
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ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
·
2022
·Vol. 47
·期 9
·11793-11805
·
IF 2.807
Lan Lefang,Lu Xiaobin,Zheng Yancheng,Zhang Guoqing,Cheng Zhe
Cationic Gemini surfactants which were synthesized from long carbon chain alkyl tertiary amines and 1,3-dibromopropane, and polyether ammoniums as clay stabilizers which were synthesized by the reaction of polyether ammine (D230) with formic acid and hydrochloric acid, named as D230FA and D230HC, respectively, were used to preclude hydration expansion and migration of clay minerals in low permeability oilfields, hence facilitating the water injection and oil recovery from the tight reservoirs. The surface tension and interfacial tension (IFT) of surfactants, anti-swelling property of clay stabilizers and the injection performance of the composite system were evaluated in this study. The experimental results show that C14-3-C14 has high interfacial activity and solubility, and the composite system of C14-3-C14 and polyether ammonium salt has good clay stability. The anti swelling rate of Na-clay treated by the solution of 1.5% KCl + 0.1% C14-3-C14 after 10 times of washing with distilled water decreased from 72.6% to 28.0%. While 1% D230FA and 1% D230HC mixed with 0.1% C14-3-C14 + 0.5% KCl have the initially anti swelling rates of 72.1% and 68.3%, and the anti swelling rates after flushing with distilled water reach 61.2% and 58.3%, respectively, indicating good anti-swelling durability . Core flooding experiments show that the injection performance of the composite system depends on the contact angle ( θ ) and the surface tension ( γ ), and the composite system contained 1% D230HC with lower value of γ cos θ has better injection performance than that of 1% D230FA. XRD analysis shows the lower interlayer spacing of clay minerals treated with clay stabilizer solution containing polyether ammonium salts.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2022
·Vol. 40
·期 6
·584-592
·
IF 3.815
Xiao Yang,He Chong,Yang Zi-Fan,Chen Er-Qiang,Lu Huan-Jun,Li Xiao-Hong,Tu Ying-Feng
We demonstrate here a novel method for the design of liquid crystals (LCs) via the cyclization of mesogens by flexible chains. For two azobenzene-4,4′-dicarboxylate derivatives, the cyclic dimer, cyclic bis(tetraethylene glycol azobenzene-4,4′-dicarboxylate) (CBTAD), shows LC properties with smectic A phase, while its linear counterpart, bis(2-(2′-hydroxyethyloxy)ethyl azobenzene-4,4′-dicarboxylate (BHAD), has no LC phase. The difference is ascribed to the shackling effect from the cyclic topology, which leads to the much smaller entropy change during phase transitions and increases the isotropic temperature greatly for cyclics. In addition, the trans -to- cis isomerization of azobenzene groups under UV-light is also limited in CBTAD. With the reversible isomerization of azobenzene groups, CBTAD showed interesting isothermal phase transition behaviors, where the LC phase disappeared upon photoirradiation of 365 nm UV-light, and recovered when the UV-light was off. Combined with the smectic LC nature, a novel UV-light tuned visible light regulator was designed, by simply placing CBTAD in two glass plates. The scattered phase of smectic LC was utilized as the “OFF” state for light passage, while the UV-light induced isotropic phase was utilized as the “ON” state. The shackling effect outlined here should be applicable for the design of cyclic LC oligomers/polymers with special properties.
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Journal of the Australian Ceramic Society
·
2020
·Vol. 57
·期 1
·9-20
·
IF 1.307
Wu Meng,Wang Tao,Zha Wei,Xiang Wei,Zheng Wangbo
The aim of this study is to investigate the effect of nano-SiO 2 (NS) particles addition on physico-mechanical properties, microstructure evolution, and apatite-formation ability of bioactive tricalcium silicate (TCS). Furthermore, the concentrations of calcium (Ca), silicon (Si), and phosphorus (P) in phosphate buffer saline solution (PBS) after immersion of TCS-based cements with diverse additions of NS were also evaluated. The results revealed that the setting time of cement pastes lowered significantly from 72 to 51 min with the doping content of NS from 0 to 5%. The compressive strength and Vickers micro-hardness (HV) of cements with addition of 3% NS after setting for 7 days were significantly higher than those of TCS cements without NS. Furthermore, the cements could induce hydroxyapatite (HA) formation on their surfaces in PBS. The storage solution of TCS-based cements was alkaline, and the pH values changed from 12.26 to 12.65. There were no significant differences about Ca, Si, and P concentrations of PBS after immersion of TCS cement with the addition of 3% NS as compared with doping 0% NS. Our results indicated that TCS cement with addition of 3% NS had enhanced physico-mechanical properties and good HA-formation ability and may make it a potential choice for using as a novel dental material.
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CELLULOSE
·
2022
·Vol. 29
·期 10
·5645-5658
·
IF 6.123
Qiu Xianyu,Wang Shuoyu,Chen Shuixia
Abstract Cellulose-nanofiber-based hydrogels (CNF-Gel) exhibit excellent mechanical properties and designable functions. However, it is difficult to coordinate the complex self-assembly structure and various functions, which limits the widespread use of CNF-Gel. Here, a simple and environmental-friendly approach for the preparation of three-dimensional dialdehyde-cellulose-nanofiber-based hydrogels (DAC-Gel) was developed via periodate oxidation of cellulose-nanofiber and freeze drying. The self-assembled DAC-Gel with flexible skeleton structure and numerous aldehyde groups was synthesized without organic solvents or cross-linking agents added. After 100 compression-releasing cycles at a maximum compressive strain of 30%, DAC-Gel-1.5 remained high stress remaining and low energy loss coefficient, demonstrating durable compressive property. As the functional intermediate, DAC-Gel can be further modified to conveniently prepare functional products, which shows a variety of potential applications such as in the carbon capture and storage. After amination with polyethylenimine via Schiff base reaction, the DAC-based CO 2 adsorbent DAC-1.5@PEI still remained good elasticity. The introduction of PEI endowed DAC-1.5@PEI with high nitrogen content (18.57 wt%) and CO 2 adsorption capacity (2.63 mmol/g) under humid condition. This research develops a synthesis method of flexible and three-dimensional cellulose-based materials from another perspective, and provides useful information for understanding the synthesis process of DAC-Gel in different sizes. Graphical abstract
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International Journal of Environmental Science and Technology
·
2021
·Vol. 19
·期 4
·2379-2388
·
IF 2.86
Tallou A.,Aziz F.,Garcia A. J.,Salcedo F. P.,El Minaoui F. E.,Amir S.
Tomatoes ( Solanum lycopersicum ) plant were provided with bio-fertilizers issued from anaerobic digestion of olive mill wastewater without and with 1%, 5% of phosphate residues in mesophilic conditions for 25 days. 1% of raw substrates (OMW raw; OMW + 1%PR raw; olive mill wastewater + 5%phosphate residues raw; and phosphate residues) and digestates (olive mill wastewater digestate, olive mill wastewater + 1%phosphate residues digestate and olive mill wastewater + 5%phosphate residues digestate) was provided fortnightly to the plants. Reclaimed water from a wastewater treatment plant located in the study site was used for automatically controlled irrigation. It contained a low level of chemical fertilizers to compare tomato plant growth, leaf analysis, steam water potential, production yield and fruit quality results to plants fed with bio-fertilizers. Generally, parameters and results were progressively increased during the growing and harvesting stage, which refer to the essential elements that cover the plant’s needs. Plants fed with bio-fertilizers showed the most extended plant height (olive mill wastewater + 5% phosphate residues raw), and the best accumulation of essential elements in leaves (olive mill wastewater + 1% phosphate residues digestate and olive mill wastewater + 5%phosphate residues digestate). The maximum average fruit weight per treatment (35.5 g) was obtained when applying the digestates mixture of olive mill wastewater raw and olive mill wastewater + 5% phosphate residues. The maximum yield production per plant was obtained when applying phosphates residues. Bio-fertilizers (digestates) showed good performances, high fruit quality and perfect tomato yield production compared to the control plants. Results obtained during this study are considered promising regarding environmental framework. However, this study was done in a laboratory scale and needs to be applied in a large scale to provide more data on the effectiveness of the digestates application. It is also recommended to apply these bio-fertilizers on different crops and various soils for a better evaluation.
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危险品化学品经营许可证（带存储）