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Controlling the Properties of Solvent-free Fe_3O_4 Nanofluids by Corona Structure

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Nano-Micro Letters 2012年第4期4卷 208-214页

作者： Yumo Tan yaping zheng Nan Wang Aibo Zhang School of Natural and Applied Science Northwestern Polytechnical University

We studied the relationship between corona structure and properties of solvent-free Fe3O4 nanofluids. We proposed a series of corona structures with different branched chains and synthesize different solvent-free nanofluids in order to show the effect of corona structure on the phase behavior, dispersion, as well as rheology properties. Results demonstrate novel liquid-like behaviors without solvent at room temperature. Fe3O4 magnetic nanoparticles content is bigger than 8% and its size is about 23 nm. For the solvent-free nanofluids,the long chain corona has the internal plasticization, which can decrease the loss modulus of system, while the short chain of corona results in the high viscosity of nanofluids. Long alkyl chains of modifiers lead to lower viscosity and better flowability of nanofluids. The rheology and viscosity of the nanofluids are correlated to the microscopic structure of the corona, which provide an in-depth insight into the preparing nanofluids with promising applications based on their tunable and controllable physical properties.

关键词： Corona structure Fe3O4 nanoparticles Liquid-like behavior Solvent-free nanofluids

Synthesis of Liquid-like Trisilanol Isobutyl-POSS NOHM and Its Application in Capturing CO2

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Chemical Research in Chinese Universities 2015年第3期31卷 484-488页

作者： BAI Haipeng zheng yaping LI Peipei ZHANG Aibo School of Natural and Applied Science Northwestern Polytechnical University Xi&#39 an 710072 P.R.China

The trisilanol isobutyl polyhedral oligomeric silsesquioxane（POSS） was fabricated into liquid-like nano- particle organic hybrid materials（NOHMs） with ）,-（2,3-epoxypropoxy）propytrimethoxysilane as corona and polyethe- ramine M2070 as canopy, and the product was called liquid-like POSS NOHM. The liquid-like POSS NOHM has a low viscosity at room temperature without any solvent and the mass fraction of trisilanol isobutyl POSS was 23.38%. The liquid-like POSS NOHM shows great CO2 capturing property with a capacity of 2.108 mmol/g（PCO2=6 MPa）. The physical adsorption increased obviously with the pressure going up and it may make a difference between liquid-like POSS NOHMs and traditional monoethamolamine（MEA） based CO2 absorbent. The recycle property was also studied. The NOHM behaved as fresh product even after 10 cycles.

关键词： Liquid-like nanoparticle organic hybrid material Polyhedral oligomeric silsesquioxane CO2 capture

Magnetically recoverable Fe3O4@polydopamine nanocomposite as an excellent co-catalyst for Fe^3+ reduction in advanced oxidation processes

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Journal of Environmental Sciences 2020年第6期32卷 69-78页

作者： Ling Fan Jinliang Xie Zhilin Zhang yaping zheng Dongdong Yao Ting Li Department of Applied Chemistry School of Natural and Applied ScienceNorthwestern Polytechnical UniversityXi'an 710072China

Advanced oxidation processes are widely applied to removal of persistent toxic substances from wastewater by hydroxyl radicals(·OH),which is generated from hydrogen peroxide(H2O2)***,their practical applications have been hampered by many strict conditions,such as iron sludge,rigid pH condition,large doses of hydrogen peroxide and Fe^2+,***,a magnetically recyclable Fe3O4@polydopamine(Fe3O4@PDA)coreshell nanocomposite was *** an excellent reducing agent,it can convert Fe^3+to Fe^2+.Combined with the coordination of polydopamine and ferric ions,the production of iron sludge is *** minimum concentration of hydrogen peroxide(0.2 mmol/L and Fe^2+(0.18 mmol/L))is 150-fold and 100-fold lower than that of previous reports,*** also exhibits excellent degradation performance over a wide pH range from 3.0 to *** after the tenth recycling,it still achieves over 99%degradation efficiency with the total organic carbon degradation rate of 80%,which is environmentally benign and has a large economic *** discovery paves a way for extensive practical application of advanced oxidation processes,especially in environmental remediation.

关键词： Fe3O4@polydopamine nanocomposites Fenton-like catalysts Fe^3+/Fe^2+cycle Magnetically reusable

Rhizosphere microbial markers (micro-markers): A new physical examination indicator for traditional Chinese medicines

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Chinese Herbal Medicines 2024年第2期16卷 180-189页

作者： Kailin Yang yaping zheng Kangmeng Sun Xinyan Wu zheng Zhang Chunnian He Peigen Xiao Institute of Medicinal Plant Development Chinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100193China Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine Ministry of EducationBeijing 100193China

Rhizosphere microorganisms,as one of the most important components of the soil microbiota and plant holobiont,play a key role in the medicinal plant-soil ecosystem,which are closely related to the growth,adaptability,nutrient absorption,stress tolerance and pathogen resistance of host *** recent years,with the wide application of molecular biology and omics technologies,the outcomes of rhizosphere microorganisms on the health,biomass production and secondary metabolite biosynthesis of medicinal plants have received extensive ***,whether or to what extent rhizosphere microorganisms can contribute to the construction of the quality evaluation system of Chinese medicinal materials is still *** on the significant role of rhizosphere microbes in the survival and quality formation of medicinal plants,this paper proposed a new concept of rhizosphere microbial markers(micro-markers),expounded the relevant research methods and ideas of applying the new concept,highlighted the importance of micro-markers in the quality evaluation and control system of traditional Chinese medicines(TCMs),and introduced the potential value in soil environmental assessment,plant pest control and quality assessment of *** provides reference for developing ecological planting of TCMs and ensuring the production of high quality TCMs by regulating rhizosphere microbial communities.

关键词： physical examination indicator quality evaluation quality formation of medicinal plants rhizosphere microorganisms rhizosphere microbial markers

A generalizable strategy based on the rule of“like dissolves like”to construct porous liquids with low viscosity for CO_(2)capture

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Nano Research 2023年第7期16卷 10369-10380页

作者： Yangyang Xin Hailong Ning Dechao Wang(✉) Xiaoqian Li Wendi Fan Xiaoqian Ju Hongni Wang Yichi Zhang Zhiyuan Yang Dongdong Yao yaping zheng School of Chemistry and Chemical Engineering Northwestern Polytechnical UniversityXi’an 710129China School of Chemistry and Chemical Engineering Nanjing UniversityNanjing 210023China College of Chemistry and Chemical Engineering Xi’an University of Science and TechnologyXi’an 710054China Key Laboratory of Coal Resources Exploration and Comprehensive Utilization Ministry of Natural ResourcesXi’an 710021China

Porous liquids(PLs),an emerging porous material with permanent cavities,have attracted extensive attention in recent ***,the current construction methods are complicated and resulting PLs possess high viscosity values,which cannot meet the requirements of practical industrial ***,we demonstrate a generalizable and simple strategy to prepare type III PLs with low viscosity based on the rule of“like dissolves like”.Specifically,the monoglycidyl ether terminated polydimethylsiloxane(denoted by E-PDMS)is attached to the surface of Universitetet i Oslo(UiO)-66-NH_(2)via covalent linkage,constructing the pore generator(UiO-66-NH_(2)-E-PDMS,denoted by P-UiO-66).Then,P-UiO-66 is dispersed into different types and amounts of sterically hindered solvents(PDMS400 or PDMS6000),obtaining a series of type III PLs(denoted by P-UiO-66-PLs)with permanent cavities and low *** gas sorption-desorption test shows that P-UiO-66-PLs have an enormous potential for CO_(2)/N_(2) selective ***,the porosity of P-UiO-66-PLs and the CO_(2)sorption mechanism are demonstrated by molecular ***,the generality of the synthesis strategy is confirmed by the successful construction of PLs using two other amino-metal-organic frameworks(MOFs)(MIL-53(Al)-NH_(2)and MIL-88B(Fe)-NH_(2)).Importantly,it’s worth noting that the strategy based on the rule of“like dissolves like”sheds light on the preparation of other types of PLs for task-specific applications.

关键词： porous liquids like dissolves like CO_(2)capture low viscosity

Phase-feeding strategy for Chlorella vulgaris to enhance biomass and lipid productivity

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International Journal of Agricultural and Biological Engineering 2017年第2期10卷 205-215页

作者： Chang Haixing Liao Qiang Fu Qian Huang Yun Xia Ao zheng yaping Sun Yahui Zhu Xun Key Laboratory of Low-grade Energy Utilization Technologies and Systems Chongqing UniversityMinistry of EducationChongqing 400030China Institute of Engineering Thermophysics Chongqing UniversityChongqing 400030China

A phase-feeding strategy of nutrients based on requirements of Chlorella vulgaris in different physiological phases was examined to maximize the biomass and lipid *** strategy includes reduction of duration in adaption phase(stage-I),enhancement of biomass in growth phase(stage-II)and improvement of lipid productivity in stationary phase(stage-III).The duration of microalgae in adaption phase was reduced from 52 h to 34 h at nitrogen and phosphorus feeding rates of 5.11 mg/(L·d)and 0.54 mg/(L·d),whereas the maximum biomass concentration during growth phase was improved to(4.03±0.25)g/L at nitrogen and phosphorus feeding rates of 20.04 mg/(L·d)and 4.21 mg/(L·d).In stationary and decline phases,a maximum lipid productivity of 132.30 mg/(L·d)was achieved when nutrients supply was stopped at 128 h,which was 28.86 mg/(L·d)higher than that when nutrients supply was stopped at 104 *** multi-phase cultivation could be a promising strategy for simultaneous enhancement of microalgae biomass and lipid productivity.

关键词： cultivation strategy lipid productivity microalgae nutrients regulation

Fe_3O_4-MWCNTs在环氧树脂中的定向排列

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复合材料学报 2013年第6期30卷 54-59页

作者：陈伟郑亚萍西北工业大学理学院西安710072

用共沉淀法制备了具有超顺磁性Fe3O4-MWCNTs(多壁碳纳米管)复合粒子,加入环氧树脂(EP)中,在0.6T的弱定磁场下固化成型。采用TEM研究其定向程度及分散性,并进行动态热机械分析、差热分析和导热率测试。结果表明,MWCNTs表面包覆了磁性Fe3O... 详细信息

用共沉淀法制备了具有超顺磁性Fe3O4-MWCNTs(多壁碳纳米管)复合粒子,加入环氧树脂(EP)中,在0.6T的弱定磁场下固化成型。采用TEM研究其定向程度及分散性,并进行动态热机械分析、差热分析和导热率测试。结果表明,MWCNTs表面包覆了磁性Fe3O4纳米粒子,Fe3O4-MWCNTs复合物按照首尾衔接的方式沿着磁场方向定向排列。Fe3O4-MWCNTs/EP纳米复合材料表现出明显的各向异性,垂直于Fe3O4-MWCNTs轴向导热率低于平行方向的导热率,Fe3O4-MWCNTs的加入对于平行方向的导热率影响不大。Fe3O4-MWCNTs的加入使环氧树脂的储能模量变小,损耗模量变大,损耗因子均大于纯环氧树脂,表现出良好的阻尼性能。当Fe3O4-MWCNTs与EP质量比为0.3%时,损耗因子在20℃的温域内大于0.7,最高值达到1.16。

关键词：磁性碳纳米管 Fe3O4 纳米粒子磁场定向导热率环氧树脂

Study on Physiological Characteristics and Supporting Techniques of Huayu 22 Peanut

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Asian Agricultural Research 2015年第10期7卷 74-76 82,82页

作者： yaping zheng Yongmei zheng zhengfeng WU Xuewu SUN Caibin WANG Shandong Peanut Research Institute

Huayu 22 Peanut( Arachis hypogaea L.) belongs to ordinary large variety of peanut with high quality,high yield potential and high stress resistance. Study on nutrition characteristics,stress physiology and supporting techniques of Huayu 22 Peanut is conducive to further developing its application value in breeding and exploiting its high yield potential. Compared with Baisha 1016 Peanut,Huayu 22 Peanut has greater shade tolerance. In weak light,both the leaf area and rate of photosynthesis of Huayu 22 Peanut decline slightly,and damage of chloroplast ultramicrostructure is less,light compensation point and chloroplast a / b are lower,and capturing and utilization efficiency of weak light are higher; after removal of shade,Huayu 22 Peanut plant gets recovered quickly with higher growth compensation effect but slight dropping of yield. Characteristics of N supply for Huayu 22 Peanut at different growth stages are as follows: N supply intensity of root nodule takes on unimodal curve with peak at pod bearing stage. The N supply intensity of soil takes on N shape with higher value at pegging stage and pod filling stage; N supply intensity takes on unimodal curve with peak at pegging stage. At seedling stage and pod filling stage,N is mainly supplied by soil; at pegging stage and pod bearing stage,N is supplied by root nodule. At whole growth stage,root nodule has the largest contribution to N supply,accounting for 50. 0%,followed by soil and fertilizer,and the proportion is about 5: 3: 2. The study established standardized supporting technique for simple cultivation of Huayu 22 Peanut with " single-seed planting,high effective fertilizer application,and three sprays and multi-prevention".

关键词： Peanut Huayu 22 Shade tolerance physiology Nutriti

Branched-chain fatty acids from goat milk alleviate ulcerative colitis via the TLR4/NF-κB/NLRP3 pathway

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Food Science and Human Wellness 2024年第6期13卷 3624-3632页

作者： Jiaxin Zhang Jinjing Zhong zhengying Cui Yu Shen yaping zheng Yu Zhang Chaoxin Man Yanmei Hou Qianyu Zhao Yujun Jiang Key Laboratory of Dairy Science Ministry of EducationDepartment of Food ScienceNortheast Agricultural UniversityHarbin 150030China Hyproca Nutrition Co. Ltd.Changsha 410000China

Branched-chain fatty acids(BCFAs)are new bioactive fatty acids with anti-inflammatory ***,the role of BCFAs in alleviating ulcerative colitis has not been ***,we evaluated the protective effect of BCFAs from goat milk in mice with colitis induced using dextran sodium sulfate(DSS)and explored the corresponding *** results show that BCFAs extracted from goat milk can significantly alleviate weight loss in mice,and reduce the disease activity index and the activity of myeloperoxidase while increasing the content of antioxidant enzymes in colon tissue and reducing the oxidation stress *** data also show that BCFAs can down-regulate the gene and protein expression of the toll-like receptor 4(TLR4)/nuclear factorκB p65(NF-κB p65)/NOD-like receptor thermal protein domain associated protein 3(NLRP3)signaling pathway,and at the same time significantly reduce the expression of pro-inflammatory factors tumor necrosis factorα(TNF-α),interleukin 1β(IL-1β),and IL-18 in colon tissue,and significantly increase the expression of the anti-inflammatory factor *** conclusion,these results demonstrated that BCFAs in goat milk exerted effects on colitis-related inflammatory cytokines and inhibited inflammation by inducing the TLR4/NF-κB/NLRP3 pathway to alleviate DSS-induced ulcerative *** study provides evidence for the potential of BCFAs as bioactive fatty acids in food products and to ameliorate ulcerative colitis development in mice.

关键词： Goat milk Ulcerative colitis Branch-chain fatty acids TLR4/NF-κB/NLRP3 pathway