检索结果-南通市图书馆

Recent advances in nanoporous graphene membrane for gas separation and water purification

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2015年第21期60卷 1807-1823页

作者： chengzhen sun Boyao Wen Bofeng Bai State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University

Graphene is a one-atom-thick sheet of graphite comprising sp2-hybridized carbon atoms arranged in the hexagonal honeycomb lattices. By removing the honeycomb lattices and forming nanopores with specific geometry and size, nanoporous graphene has been demonstrated as a very high-efficiency separation membrane, due to the ultrafast molecular permeation rate for its one-atom thickness. This review focuses on the recent advances in nanoporous graphene membrane for the applications of gas separation and water purification, with a major emphasis on the molecular permeation mechanisms and the advanced fabrication methods of this state-of-the-art membrane. We highlight the advanced theoretical and experimental works and discuss the gas/water molecular transport mechanisms through the graphene nanopores accompanied with theoretical models. In addition, we summarize some representative membrane fabrication methods, covering the graphene transfer to porous substrates and the pore generation. We anticipate that this review can provide a platform for understanding the current challenges to make the conceptual membrane a reality and attracting more and more attentions from scientists and engineers.

关键词： Nanoporous graphene Gas separationWater purification Molecular permeationmechanism Membrane fabrication

Semiempirical equations of state of H_(2)O/CO_(2) binary mixtures in graphite nanoslits

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2023年第8期66卷 83-92页

作者： Haoxuan Li Bin Zhao chengzhen sun Bofeng Bai State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'an 710049China

The existence of confining walls limits the prediction accuracy of nanoconfined fluids using macroscopic equations of state(EOSs);moreover,appropriate EOSs for multicomponent mixture fluids in nanoconfined spaces are ***,we derive the EOS of multicomponent mixture fluids confined in nanospaces at high temperatures and pressures,mainly considering the nanoconfinement effect and the competitive adsorption effect between different ***,the EOSs are validated through comparison with the molecular dynamics-simulated Pv T data of CO_(2)/H_(2)O mixtures in graphite *** consider the above effects,we derive two EOSs via two modeling methods:EOS I is obtained through modification of the actual component occupation volume in the Peng-Robinson equation of state(PR EOS)by fitting the binary component interaction coefficient and the number of adsorbed molecules according to a selectivity coefficient,while EOS II is obtained by considering the decreased pressure of the fluids in PR EOS by adding an attractive term between components and *** the simulation results as a benchmark,the two EOSs exhibited good prediction accuracies under low CO_(2) concentrations,and generally,EOS II was more accurate than EOS *** study fills the gap in the EOSs of nanoconfined mixture fluids,and the obtained equations can help to further describe the thermodynamic properties of confined mixture fluids.

关键词： confined fluid mixtures equation of state nanoconfined spaces molecular dynamics simulation

Comparative proteomic profiles of resistant/susceptible cucumber leaves in response to downy mildew infection

在线全文

学校读者我要写书评

暂无评论

Horticultural Plant Journal 2021年第4期7卷 327-340页

作者： chengzhen sun Xiaofei Song Jinshuang Zheng Xiaoli Li Zhihong Feng Liying Yan Hebei Key Laboratory of Horticultural Germplasm Excavation and Innovative Utilization QinhuangdaoHebei 066004China College of Horticulture Science and Technology Hebei Normal University of Science and TechnologyQinhuangdaoHebei 066004China

Downy mildew is a serious disease in cucumber production worldwide,which is caused by Pseudoperonospora cubensis(Berk.&Curt.)*** the mechanism of cucumber response to downy mildew infection is important for breeding improvement and production;however,the research remains largely elusive.A comparative proteomic approach was used to reveal the differential accumulation of the proteomes from leaves of cucumber(susceptible line and resistant line)that were inoculated with *** or not by two-dimensional electrophoresis and MALDI-TOF/TOF MS.A total of 76 protein spots were successfully identified with significant changes in abundance(>2-fold,P<0.05)in downy mildew infected or not leaves for the susceptible line and resistant *** the functional annotation,these proteins were classified into 8 groups including photosynthesis(29%),energy and metabolism(29%),cell rescue and defense(17%),and protein biosynthesis,folding and degradation(13%),unclassified(7%),nucleotide metabolism(3%),signal transduction(1%)and cellular process(1%).Among the 17 differentially expressed proteins between the resistant and susceptible cucumber line,most of the protein spots were concentrated in cell rescue and defense(4)and energy and metabolism(4).Moreover,a schematic diagram containing majority of the metabolic pathways of cucumber leaves in response to downy mildew was *** network revealed the positive effect of several functional components in cucumber seedlings’resistant to downy mildew such as accumulation of energy supply and resistance-related proteins,hastened protein metabolism and photorespiratory,inhibited photosynthesis,and triggered photosystem repair and programmed cell *** together,these results have advanced a further understanding of the key metabolic pathways of cucumber resistance to downy mildew and pathogen control in the proteomic level.

关键词： Defense response Downy mildew Proteomics Cucumber

CsIPT1b and CsUGT85A2 delay female corolla opening in cucumber by regulating the content of cytokinins

在线全文

学校读者我要写书评

暂无评论

Horticultural Plant Journal 2023年第4期9卷 754-762页

作者： Xiaoli Li Haonan Cui Xiaofei Song chengzhen sun Zhuo Ding Xueyun Zhu Xiaofeng Liu Liying Yan Hebei Key Laboratory of Horticultural Germplasm Excavation and Innovative Utilization College of Horticulture Science and TechnologyHebei Normal University of Science and TechnologyQinhuangdaoHebei 066004China College of Horticulture Qingdao Agricultural UniversityQingdaoShandong 266109China Engineering Laboratory of Genetic Improvement of Horticultural Crops of Shandong Province QingdaoShandong 266109China

Corolla opening is essential for the propagation of unisexual flowering plants,meanwhile commodity fruits with opening corolla have higher commodity value in cucumber fresh food *** now,there is little research on the mechanism of corolla opening in *** a previous paper,we identified a unique cucumber(Cucumis sativus)line(‘6457’)that possesses super ovaries and shows delayed corolla opening when nutrient supplies are *** also previously showed that the expression of CsIPT1b(isopentenyl transferase)and CsUGT85A2(cytokinin glycosyltransferase)is correlated with the delayed opening of the female ***,we investigated the mechanism of delayed female corolla opening in cucumber by conducting transgenic experiments,hormone assays,and yeast one-hybrid ***1b and CsUGT85A2 positively and negatively regulated delayed female corolla opening,*** CsIPT1b-overexpressing plants and CsUGT85A2 knockout plants,the content of the trans-zeatin riboside,trans-zeatin,and N6-isopentenyladenosine was ***,our findings indicate that CsIPT1b and CsUGT85A2 were important regulators of the timing of female corolla *** genes could thus be targets to cucumber molecular breeding of fruit with flowers remaining on the tip.

关键词： Cucumis sativus CsIPT1b CsUGT85A2 Corolla opening

CsTRM5 regulates fruit shape via mediating cell division direction and cell expansion in cucumber

在线全文

学校读者我要写书评

暂无评论

Horticulture Research 2023年第3期10卷 151-163页

作者： Yang Xie Xiaofeng Liu chengzhen sun Xiaofei Song Xiaoli Li Haonan Cui Jingyu Guo Liu Liu Ao Ying Zeqin Zhang Xueyun Zhu Liying Yan Xiaolan Zhang Hebei Key Laboratory of Horticultural Germplasm Excavation and Innovative Utilization College of Horticulture Science and TechnologyHebei Normal University of Science and TechnologyQinhuangdao 066004China State Key Laboratories of Agrobiotechnology Joint International Research Laboratory of Crop Molecular BreedingBeijing Key Laboratory of Growth and Developmental Regulation for Protected Vegetable CropsDepartment of Vegetable SciencesChina Agricultural UniversityBeijing 100193China Engineering Laboratory of Genetic Improvement of Horticultural Crops of Shandong Province College of HorticultureQingdao Agricultural UniversityQingdao 266109China

Fruit shape and size are important appearance and yield traits in cucumber,but the underlying genes and their regulatory mechanisms remain poorly *** we identified a mutant with spherical fruits from an Ethyl Methane Sulfonate(EMS)-mutagenized library,named the qiu *** with the cylindrical fruit shape in 32X(wild type),the fruit shape in qiu was round due to reduced fruit length and increased fruit *** analysis narrowed the candidate gene in the 6.47 MB range on Chr2,harboring the FS2.1 locus reported previously.A single-nucleotide polymorphism(SNP)(11359603)causing a truncated protein of CsaV3_2G013800,the homolog of tomato fruit shape gene SlTRM5,may underlie the fruit shape variation in the qiu *** of CsTRM5 by the CRISPR-Cas9 system confirmed that CsaV3_2G013800/CsTRM5 was the causal gene responsible for *** analysis showed that the spherical fruit in qiu resulted mainly from increased and reduced cell division along the transverse and longitudinal directions,***,the repressed cell expansion contributed to the decreased fruit length in *** profiling showed that the expression levels of cell-wall-related genes and abscisic acid(ABA)pathway genes were significantly upregulated in *** measurements indicated that ABA content was greatly increased in the qiu *** ABA application reduced fruit elongation by inhibiting cell expansion in *** together,these data suggest that CsTRM5 regulates fruit shape by affecting cell division direction and cell expansion,and that ABA participates in the CsTRM5-mediated cell expansion during fruit elongation in cucumber.

关键词： expansion shape media

气体分子在二维石墨烯纳米孔中的选择性渗透特性（英文）

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

物理化学学报 2018年第10期34卷 1136-1143页

作者：孙成珍白博峰西安交通大学动力工程多相流国家重点实验室西安710049

二维石墨烯纳米孔中气体分子的选择性渗透对多孔石墨烯分离膜非常重要。本文采用分子动力学方法研究了气体分子在氮氢修饰石墨烯纳米孔中的渗透特性,从分子的大小和结构、纳米孔的构型以及分子与石墨烯之间的作用强度等角度阐明了分子... 详细信息

二维石墨烯纳米孔中气体分子的选择性渗透对多孔石墨烯分离膜非常重要。本文采用分子动力学方法研究了气体分子在氮氢修饰石墨烯纳米孔中的渗透特性,从分子的大小和结构、纳米孔的构型以及分子与石墨烯之间的作用强度等角度阐明了分子出现选择性渗透的原因。结果表明,不同分子的渗透率不同,即H_2O> H_2S> CO_2> N_2> CH_4。渗透率跟分子的质量和直径以及分子在石墨烯表面上的吸附密度有关;根据气体分子动理学理论,渗透率跟分子质量成反比关系;而分子在石墨烯表面上的高吸附密度对渗透起促进作用。对于H_2O和CH4分子,分子直径起主导作用;H_2O分子直径最小,其渗透率最大;同理,CH_4分子的渗透率最小。对于H_2S和CO_2分子,H_2S分子的直径较大,但其与石墨烯之间的作用强度较大(吸附密度较高),导致渗透率较高;对于CO_2和N_2分子,CO_2分子的直径较小,并且与石墨烯之间的作用强度较大,渗透率较高。同时发现,分子在纳米孔中的渗透使得其在石墨烯表面的密度分布极不均匀。纳米孔左右两侧的功能化氮原子使CH_4分子容易从孔两侧区域穿过,而其它分子由于直径较小在纳米孔中心区域穿过的概率最大。分子与石墨烯之间的作用越强,导致分子在石墨烯表面区域内停留的时间越长,最终使其在渗透纳米孔的过程中所经历的时间越长。本文所采用的氮氢修饰石墨烯纳米孔中,分子渗透速率达到~10^(-3)mol·s^(-1)·m^(-2)·Pa^(-1),并且其它分子相对于CH_4分子的选择性也很高,说明基于该类型纳米孔的多孔石墨烯分离膜在天然气处理等工业气体分离领域具有很好的应用前景。

关键词：石墨烯纳米孔选择性渗透气体分子分子动力学

在线全文

学校读者我要写书评

暂无评论

石墨烯基分离膜可行吗?

科学通报 2020年第1期65卷 3-5页

作者：孙成珍白博峰西安交通大学动力工程多相流国家重点实验室

提高膜材料的分子渗透速率对于膜分离技术在气体分离和水净化等领域的高效应用至关重要.通常认为,膜的渗透率与其厚度成反比例关系.因此,石墨烯及其衍生物由于原子尺度的厚度成为了理想的分离膜材料.从石墨烯被发现开始,石墨烯基分离膜... 详细信息

提高膜材料的分子渗透速率对于膜分离技术在气体分离和水净化等领域的高效应用至关重要.通常认为,膜的渗透率与其厚度成反比例关系.因此,石墨烯及其衍生物由于原子尺度的厚度成为了理想的分离膜材料.从石墨烯被发现开始,石墨烯基分离膜是否可行的问题就成为了人们关注和研究的热点.

关键词：气体分离原子尺度渗透速率分离膜水净化膜分离技术石墨烯高效应用

在线全文

学校读者我要写书评

暂无评论

二维材料气体分离膜及其应用研究进展

科学通报 2023年第1期68卷 53-71页

作者：孙成珍罗东白博峰西安交通大学动力工程多相流国家重点实验室西安710049

二维材料气体分离膜由于其独特的分子输运特性,在渗透率、选择性方面表现出优于传统薄膜的优势,具有巨大的发展潜力.石墨烯类、二维金属有机骨架、二维过渡金属碳化物/碳氮化物等二维材料中存在的亚纳米尺度空间为分子输运提供了特殊的... 详细信息

二维材料气体分离膜由于其独特的分子输运特性,在渗透率、选择性方面表现出优于传统薄膜的优势,具有巨大的发展潜力.石墨烯类、二维金属有机骨架、二维过渡金属碳化物/碳氮化物等二维材料中存在的亚纳米尺度空间为分子输运提供了特殊的通道,包括纳米孔和纳米通道,它们是高渗透性和高选择性分子筛选的根本原因.然而,二维材料薄膜在复杂工业环境中的不稳定性、难以进行大面积制备等使其实际应用受到了很大的局限,目前二维材料膜尚未大规模应用于工业生产中.本文选择性地对当前研究的热点二维材料气体分离膜研究现状进行总结,同时对其在CO_(2)捕获和分离、H_(2)分离和提纯、天然气提氦等领域的具体应用进行阐述,并且探讨了二维材料气体分离膜当前所面临的挑战与未来发展前景.

关键词：膜分离二维材料膜纳米孔纳米通道气体分离

多层级纳米通道实现高效离子选择性输运及盐差能发电

在线全文

学校读者我要写书评

暂无评论

中国科学：物理学、力学、天文学 2024年第2期54卷 100-110页

作者：马欣怡孙成珍西安交通大学动力工程多相流国家重点实验室西安710049

盐差能广泛存在于江河入海口处,蕴藏量巨大.通过反向电渗析法可将盐差能直接转化为电能,因其利用过程简单无污染,近年来受到广泛关注.二维材料的出现为盐差能发电带来新的契机,规则的纳米孔道与丰富的官能团使得其对外输出功率超过了可... 详细信息

盐差能广泛存在于江河入海口处,蕴藏量巨大.通过反向电渗析法可将盐差能直接转化为电能,因其利用过程简单无污染,近年来受到广泛关注.二维材料的出现为盐差能发电带来新的契机,规则的纳米孔道与丰富的官能团使得其对外输出功率超过了可商业化功率5 W m^(-2);但目前大多研究中盐差能性能测试膜面积仅为3×10^(4)μm^(2),且当测试面积增加时,功率会大幅下降.本文通过简单的真空抽滤法构筑氧化石墨烯与二硫化钼(GOMoS_(2))的2D-2D多层级结构,该结构使得离子选择性膜在较大的面积下仍能保持有序的层状结构,实现高通量高选择性的离子输运,最终输出较高的发电功率.同时,2D-2D结构有效地控制了二维材料膜入水溶胀的问题,提供丰富的表面孔洞与多级层间距,有利于离子的快速选择性运输.大面积膜(面积为3.14 mm^(2),为传统研究的100倍)渗透能测试结果表明,GO-MoS_(2)复合膜的渗透电压与渗透电流都表现优异,在100倍浓度梯度下可获得0.57 W m^(-2)的功率,相较于纯GO薄膜提高了92.7%.2D-2D多层级结构为构筑大面积且制备简单的高效离子选择性薄膜提供了新思路,可为二维材料在盐差能发电乃至海水淡化、气体分离、生物医学等领域的工业化应用提供参考.

关键词：盐差能发电反向电渗析氧化石墨烯二维材料