http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Sun Qiqi (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
-
Study on preparation of inorganic binder stabilized material with large dosage of phosphogypsum
Sun Qiqi,Tao Liangjing,Li Xin,Xu Wei,Yao Shuo,Li Jinpeng,Ren Qi-Fang,Chen Yue’e,Xu Chunshan,Wu Zilong,Zhu Yuelei,Ding Yi,오원춘 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.6
With the rapid development of the phosphorus chemical industry, a large amount of phosphogypsum (PG) is discharged. The impurities in PG pollute the surrounding soil, the groundwater and the air in the long-term storage. In this paper, PG as the main raw material is used to study the stable material of inorganic binder in the condition of large dosage of PG. With PG and graded gravel as stabilized materials, and cement and fly ash as binder, materials are mixed to determine the influence of PG ratio and the amount of activator on the mixture. The results show that the mechanical strength of the mixture increased first and then decreased with the increase in the proportion of PG replacing graded gravel in the mixture. The activator significantly improves the properties of the material system and makes a significant contribution to the curing of PG. The best ratio of pretreated PG: cement: fly ash: aggregate is 50:6:5:39. The amount of activator added by the external mixing method is 0.3%, which can make the unconfined compressive strength reach 4.1 MPa after 7d. Finally, water-soluble phosphorus leaching experiment is conducted for all the samples. The results show that phosphorus leaching is so little that no secondary pollution of the environment is caused.
-
Jingshun Shen,Qi Liu,Qiqi Sun,Jianwei Ren,Xue Liu,Zuoxu Xiao,Chuanwang Xing,Yuexing Zhang,Guangwu Yang,Yanli Chen 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.118 No.-
A novel two-dimensional (2D) single-atom Fe/N/C catalyst (Fe1Zn30NCPDI) has been prepared uponpyrolyzing a well-designed quasi-Fe-/Zn-phthalocyanine-based polymer (qFePc1@qZnPc30@PDI). In theqFePc1@qZnPc30@PDI precursor, qFePc moieties containing Fe-N4 sites are efficiently segregated by lotsof qZnPc moieties connected together by perylene linkers, which not only leads to the larger specific areain the resulting Fe1Zn30NCPDI but more importantly ensures the in-situ formation of Fe-N4 sites on theself-supporting 2D N-doped carbon backbone. Impressively, Fe1Zn30NCPDI exhibites its superior oxygenreduction reaction (ORR) electro-catalytic activity and peroxidase (POD)-like activity. For ORR in an alkalinemedium, it exhibites a much higher onset potential of 0.97 V and half-wave potential of 0.89 V than20 wt% Pt/C catalyst with good durability of 92 % retention rate after 20000 s. And, Fe1Zn30NCPDI alsoshows better peak power density (86 mW cm2) compared with 20 wt% Pt/C in Zn-air battery. Benefiting from the specific POD-like activity of Fe-N4, the Fe1Zn30NCPDI also shows excellent and selectiveperformance in colorimetric H2O2 sensing, with the ultrafast response (30 s), a low limit of detection(10 nM), and good robustness. This work sheds light on a promising design concept for synthesizing 2Dpolymer-derived single-atom multifunctional catalysts.
-
Xia Wang,Changcun Wu,Jun Sun,Chuanxiang Qin,Jianjun Wang,Qiqi Zhuo,Lixing Dai 한국섬유공학회 2020 Fibers and polymers Vol.21 No.5
This study introduces a facile method to prepare syndiotactic poly(vinyl alcohol) (s-PVA) fibers containing singlewalledcarbon nanotubes (SWNTs) from the corresponding composite dispersions with tea polyphenols (TP) as dispersantunder high-speed shear flow. The formation of the composite fibrous precipitates at high shear rate is largely facilitated by theSWNTs in the dispersions and slight flow resistance. Interestingly, the obtained s-PVA/SWNTs composite precipitatespossess a three-level hierarchical structure, that is, a single fiber is assembled by fibrils which are composed of microfibrils ofs-PVA-coated SWNTs. And the s-PVA fibrous precipitates containing high amounts of SWNTs could be obtained by shearingthe dispersion with relatively low SWNTs loadings, as a result, the composite fiber containing 20.7 wt% SWNTs wasprepared from the dispersion with 10.0 wt% SWNTs. In addition, with the increase of SWNTs loadings, the amount of theprecipitates increases, but crystallinity of the precipitates decreases instead.
-
Di Hu,Chao Xiao,Xia Wang,Xike Xiong,Jun Sun,Qiqi Zhuo,Jianjun Wang,Chuanxiang Qin,Lixing Dai 한국섬유공학회 2019 Fibers and polymers Vol.20 No.12
Nanofiller reinforcement is an effective approach to realize high performance of regular synthetic fibers. In thispaper, graphene oxide nanoribbons (GONRs) with complete morphology were prepared via unzipping single-walled carbonnanotubes (SWCNTs) through long-time freeze-drying after oxidation. GONRs derived from SWCNTs (SGONRs) did notneed any modification and could be directly added to poly(vinyl alcohol) (PVA) to form uniform dispersions and thencontinuous fibers were fabricated using wet spinning and hot-drawing. SGONRs provided abundant hydrogen bondinginteraction with PVA chains, so SGONRs could not only obviously improve the dispersibility in PVA, but also enhance themechanical properties of the composites. The tensile strength of PVA/SGONRs composite fibers with 0.4 wt% loading ofSGONRs reach 1032 MPa, improved by 121 % compared with PVA/SWCNTs fiber, and by 200 % with PVA fiber,respectively.
-
Application Research on Mechanical Strength and Durability of Porous Basalt Concrete
Zhu, Yuelei,Li, Jingchun,Zhu, He,Jin, Long,Ren, Qifang,Ding, Yi,Li, Jinpeng,Sun, Qiqi,Wu, Zilong,Ma, Rui,Oh, Won-Chun Materials Research Society of Korea 2022 한국재료학회지 Vol.32 No.3
Porous basalt aggregate is commonly used in roadbed engineering, but its application in concrete has rarely been studied. This paper studies the application of porous basalt in concrete. Porous basalt aggregate is assessed for its effects on mechanical strength and durability of prepared C50 concrete; because it has a hole structure, porous basalt aggregate is known for its porosity, and porous basalt aggregates can be made full of water through changing the content of saturated basalt; after full-water condition is achieved in porous basalt aggregate mixture of C50 concrete, we discuss its mechanical properties and durability. The effects of C50 concrete prepared with basalt aggregate on the compressive strength, water absorption, and electric flux of concrete specimens of different ages were studied through experiments, and the effects of different replacement rates of saturated porous basalt aggregate on the properties of concrete were also studied. The results show that porous basalt aggregate can be prepared as C50 concrete. For early saturated porous basalt aggregate concrete, its compressive strength decreases with the increase of the replacement rate of saturated aggregate; this occurs up to concrete curing at 28 d, when the replacement rate of saturated basalt aggregate is greater than or equal to 40 %. The compressive strength of concrete increases with the increase of the replacement rate of saturated aggregate. The 28 d electric flux decreases with the increase of the replacement rate of saturated aggregate, indicating that saturated porous basalt aggregate can improve the chloride ion permeability resistance of concrete in later stages.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
