检索结果-南通市图书馆

Chiral mesostructured hematite with temperature-independent magnetism due to spin confinement

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2024年第3期17卷 2019-2024页

作者： Baiwen Zhang Jing Ai Yingying Duan Te Bai Lu Han shunai che School of Physics Science and Engineering Tongji UniversityShanghai 200092China School of chemistry and chemical Engineering Tongji UniversityShanghai 200092China Wuxi Vocational College of Science and Technology Wuxi 214028China School of chemistry and chemical Engineering Frontiers Science Center for Transformative MoleculesState Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong UniversityShanghai 200240China

Hematite(α-Fe_(2)O_(3))is known to undergo conversion from weak ferromagnetic to antiferromagnetic as the temperature decreases below the Morin temperature(TM=250 K)due to spin moment rotation occurring during the Morin transition(MT).Herein,we endowed hematite with mesostructured chirality to maintain weak ferromagnetism without *** mesostructured hematite(CMH)nanoparticles were prepared by a hydrothermal method with glutamic acid(Glu)as the symmetry-breaking *** triangular bipyramidal CMH nanoparticles were composed of helically cleaved nanoflakes with twisted crystal ***-cooled(FC)magnetization measurements showed that the magnetic moments of CMH were stabilized without MT within the temperature range of 10–300 *** loop measurements confirmed the weak ferromagnetism of *** enhanced Dzyaloshinskii–Moriya interaction(DMI)was speculated to be responsible for the temperature-independent weak ferromagnetism,in which the spin configuration would be confined with canted antiferromagnetic coupling due to the mesostructured chirality of CMH.

关键词： hematite chiral mesostructure Dzyaloshinskii–Moriya interaction weak ferromagnetism antiferromagnetic material temperature-independent magnetism

Determination of multilevel chirality in nickel molybdate films by electron crystallography

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2024年第9期17卷 8571-8577页

作者： Jing Ai Yu Wang Liyuan Li Jianqiang Wang Te Bai shunai che Lu Han Sinopec(Shanghai)Research Institute of Petrochemical Technology Co. Ltd.Shanghai 201208China School of chemical Science and Engineering Tongji UniversityShanghai 200092China School of chemistry and chemical Engineering State Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong UniversityShanghai 200240China

Chiral inorganic materials have attracted great attention owning to their unique physical and chemical properties attributed to the symmetry-breaking of their *** inorganic materials can be endowed with chiral geometric configurations from achiral space group crystals through lattice twisting,screw dislocations or hierarchical self-assembled spiral morphologies,showing various characteristic chiral ***,the multilevel chirality in chiral nickel molybdate films(CNMFs)remains to be elaborately *** this paper,we report three hierarchical levels of chirality in CNMFs,spanning from the atomic to the micron scale,including primary helically coiled nanoflakes with twisted atomic crystal lattices,secondary helical stacking of layered nanoflakes,and tertiary asymmetric morphology between adjacent *** findings may enrich the chiral self-assembly structural types and provide valuable insights for the comprehensive analysis path of hierarchical chiral crystals.

关键词： chiral inorganic material nickel molybdate structural analysis transmission electron microscopy electron crystallography

Spin chiral anisotropy of diamagnetic chiral mesostructured In_(2)O_(3) films

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2024年第8期17卷 7756-7761页

作者： Ting Ji Quanzheng Deng Hao chen Lu Han Zhibei Qu shunai che Yingying Duan Frontiers Science Center for Transformative Molecules State Key Laboratory of Metal Matrix CompositesShanghai Key Laboratory for Molecular Engineering of Chiral DrugsSchool of Chemistry and Chemical EngineeringShanghai Jiao Tong UniversityShanghai 200240China School of chemical Science and Engineering Tongji UniversityShanghai 200092China Department of Medicinal chemistry School of PharmacyFudan UniversityShanghai 201203China

Spin chiral anisotropy(SChA)refers to the occurrence of different spin polarization in antipodal chiral ***,we report the SChA in diamagnetic chiral mesostructured In2O3 films(CMIFs)with manifestation of chirality-dependent magnetic circular dichroism(MCD)*** were grown on fluorine-doped tin dioxide conductive glass(FTO)substrates,which were synthesized via a hydrothermal route,with malic acid used as the symmetry-breaking *** levels of chirality have been identified in CMIFs:primary nanoflakes with atomically twisted crystal lattices and secondary helical stacking of the *** exhibit chirality-dependent asymmetric MCD signals due to the different interactions of chirality-induced effective magnetic field and external magnetic field,which distinguish from the commonly observed external magnetic fielddependent symmetric MCD *** findings provide insights into spin manipulation of spin-paired diamagnets.

关键词： chiral inorganics mesostructure diamagnet spin chiral anisotropy(SChA) magnetic circular dichroism(MCD)

Synthesis of atomically dispersed cationic nickel-confined mesoporous ZSM-48(ANMZ-48)directed by metal complexes in amphiphilic molecules

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China chemistry 2024年第1期67卷 343-350页

作者： Yu chen Quanzheng Deng Yiru Mao Yuxi Fang Zhihua Cao Honggen Peng shunai che Lu Han School of chemical Science and Engineering Tongji UniversityShanghai 200092China School of chemistry and chemical Engineering Nanchang UniversityNanchang 330031China School of chemistry and chemical Engineering Shanghai Jiao Tong UniversityShanghai 200240China School of Resources and Environment Nanchang UniversityNanchang 330031China State Key Laboratory of Metal Matrix Composites Shanghai Key Laboratory for Molecular Engineering of Chiral DrugsShanghai Jiao Tong UniversityShanghai 200240China

The synthesis of mesoporous zeolite-anchored atomically dispersed metal catalysts(ADCs)is a considerable challenge in chemistry and materials *** we report the synthesis of atomically dispersed cationic nickel-confined mesoporous ZSM-48(ANMZ-48)by in situ hydrothermal reaction employing a designed tri-functional metal complex template,by which the triquaternary ammonium groups in the hydrophilic region direct the formation of ZSM-48 zeolite;the aromatic groups in the hydrophobic tail generate the mesopores through π-π stacking;and the complexes formed by nickel ions coordinated with terpyridyl groups generate atomically dispersed Ni2+confined in zeolite frameworks due to the strong sintering resistance generated by the strong coordination *** ANMZ-48 is consisting of stacking of sheet-like ZSM-48 domains connected by multiply crystal twinning sharing the common(011)plane,generating abundant of imbedded mesopores with the uniform thickness of~2.4 nm and with the width of 10-50 *** excellent catalytic activity and stability of ANMZ-48 were also reflected in the dry reforming of methane(DRM)reaction.

关键词： atomically dispersed catalyst mesoporous zeolite ZSM-48 in situ hydrothermal synthesis the dry reforming of methane reaction

What Can Topology Bring to chemistry?

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

CCS chemistry 2024年第9期6卷 2084-2109页

作者： Wei Wang Songtao Zhou Xiujun Yu Qing-Hui Guo Yanhang Ma Jie Song Liang Zhang Xuzhou Yan Lu Han Qing Liao Xiaopeng Li Wen-Bin Zhang Yiyong Mai Shaodong Zhang shunai che Hai-Bo Yang Xuefeng Fu Mei-Xiang Wang School of chemistry and Molecular Engineering East China Normal UniversityShanghai 200062 Hangzhou Institute of Medicine Chinese Academy of SciencesHangzhou 310022Zhejiang College of chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060Guangdong MOE Key Laboratory of Bioorganic Phosphorous and chemical Biology Department of ChemistryTsinghua UniversityBeijing 100084 School of Physical Science and Technology and Shanghai Key Laboratory of High-Resolution Electron Microscopy ShanghaiTech UniversityShanghai 201210 School of chemistry and chemical Engineering Frontiers Science Center for Transformative MoleculesState Key Laboratory of Composite MaterialsShanghai Key Laboratory for Molecular Engineering of Chiral DrugsShanghai Jiao Tong UniversityShanghai 200240 School of chemical Science and Engineering Tongji UniversityShanghai 200092 Beijing Key Laboratory for Optical Materials and Photonic Devices Department of ChemistryCapital Normal UniversityBeijing 100048 Beijing National Laboratory for Molecular Sciences Key Laboratory of Polymer Chemistry and Physics of Ministry of EducationCenter for Soft Matter Science and EngineeringCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871 Department of chemical Sciences National Natural Science Foundation of ChinaBeijing 10085

The unique mathematical perspectives and principal concepts of topology have not only promoted the development of other branches of mathematics but have also deeply influenced other subjects,particularly physics and *** minireview aims to elucidate the substantial influence of topology on chemistry by critically examining both the contributions of topology to current chemical science and its potential future *** will discuss the topology of molecular structures and assemblies across various scales—from small molecules and mechanically interlocked molecules to polymers,biomacromolecules,and supramolecular *** discussion will include an exploration of cutting-edge techniques for characterizing topological features,underscoring the role of topology as a novel paradigm for the design and synthesis of new molecular ***,a critical analysis of topology’s role in the development of functional materials—such as photonic materials,polymers,biomacromolecules,and chiral materials—will demonstrate its emerging significance as a crucial parameter in unveiling novel properties and *** topology’s formidable potential,it is anticipated to be used increasingly to address pivotal challenges within chemistry and adjacent disciplines.

关键词： chemical topology topological invariants molecular graphs links and knots structureproperty relationship

Enhanced release of the poorly soluble drug itraconazole loaded in ordered mesoporous silica

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China chemistry 2015年第3期58卷 400-410页

作者： Xiao Liu shunai che State Key Laboratory of Metal Matrix Composites School of chemistry and chemical Engineering Shanghai Jiao Tong University

It is known that the energy of the amorphous state of itraconazole loaded in ordered mesoporous materials is high relative to that of the crystalline state and is responsible for enhanced solubility and dissolution rate. We investigated the effects of particle size(0.7–5μm), mesostructure(2D p6 mm, cubic Ia-3d and cubic Fm-3m) and pore size(2.2–15.4 nm) of mesoporous silicas on the release performance of itraconazole. Results indicated that the release performance was not influenced by the particle sizes tested here, that the release performance increased with increasing pore diameter due to the lower probability of drug molecules colliding to recrystallize in large pores, and that the release performance was decreased in the cage-type pore structure(Fm-3m) compared to that in the cylindrical pore structures(p6mm and Ia-3d) because of the small entrance to the cagelike pores that retards the drug release.

关键词： itraconazole poorly soluble enhanced release mesoporous silica

Mesoporous Silica Microspheres Composited with SBA-15s for Resonance Frequency Reduction in a Miniature Loudspeaker

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

chemical Research in Chinese Universities 2020年第5期36卷 760-767页

作者： ZHANG Xinyue che shunai School of chemistry and chemical Engineering State Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong UniversityShanghai 200240P.R.China

Microspheres composited with mesoporous SBA-15 particles and silica were investigated as fillers in miniature loudspeakers to study the factors influencing the resonance frequency offsets(RFOs).Mesoporous silica microspheres(MSMs)were prepared by self-assembling SBA-15 mesoporous silica in a microemulsion synthesis *** formation process involved the fabrication of a stable O/W microemulsion of tetrabutyl orthosili-cate(TBOS)and hexadecyltrimethylammonium bromide(C16TAB)and encapsulation of *** RFO increased and then decreased with increasing particle size(in the length range of 0.7—5.5 μm and in the width range of 0.2—0.45 μm),increased with increasing pore size(in the range of 7.0—9.4 nm)of SBA-15s,and increased with decreasing particle size(105—900 μm)of MSMs.

关键词： Mesoporous silica microsphere Microemulsion SBA-15 Resonance frequency offset

Electrocatalytic reduction of CO_(2) on chiral Cu surfaces

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Structural chemistry 2023年第8期42卷 1-3页

作者： Yuxi Fang Lu Han shunai che School of chemistry and chemical Engineering Frontiers Science Center for Transformative MoleculesState Key Laboratory of Metal Matrix CompositesShanghai KeyLaboratory for Molecular Engineering of Chiral DrugsShanghai Jiao Tong University800 Dongchuan RoadShanghai200240China School of chemical Science and Engineering Tongji University1239 Siping RoadShanghai200092China

Carbon dioxide reduction products ranging from small molecules tobiomolecules are highly diverse in natural *** of carbon dioxide to produce a variety of products is one of themost efficient methods to understand *** applications of CO_(2)electro-reduction products in the transportation industry include theproduction of synthetic fuels,such as methanol and ethanol,which canbe used as alternatives to fossil ***,CO_(2)electro-reductionproducts can be used to produce chemicals and materials used in manyareas in industry,such as plastics and lubricants[1].

关键词： dioxide catalytic chiral

Insight on metal ions inducing chiral self-assembly of DNA in silica mineralization

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2023年第3期16卷 3998-4003页

作者： Arepati Azhati Lu Han Zhibei Qu Zhouhong Ren Xi Liu Liwei chen shunai che School of chemistry and chemical Engineering Frontiers Science Center for Transformative MoleculesState Key Laboratory of Metal Matrix CompositesShanghai Key Laboratory for Molecular Engineering of Chiral DrugsShanghai Jiao Tong UniversityShanghai 200240China School of chemical Science and Engineering Tongji UniversityShanghai 200092China Department of Medicinal chemistry School of PharmacyFudan UniversityShanghai 201203China School of chemical Science and Engineering In-situ Center for Physical SciencesFrontiers Science Center for Transformative MoleculesShanghai Jiao Tong UniversityShanghai 200240China

The self-assembly of DNA provides an attractive approach to understanding structural formation mechanism in living organisms and to assisting applications in materials ***,we investigated the effect of metal ions on chiral self-assembly of DNA through the synthesis of chiral mesostructured silica via self-assembly of metal ions,DNA,and silica source.31 types of multivalent cationic metal ions were found to induce formation of chiral impeller-like DNA-silica complexes due to the chiral stacking of *** strength of the interaction between the metal ion and phosphate group of DNA was speculated for the chiral stacking of DNA due to close distance of adjacent DNA to assure mutual *** calculations indicated that chiral packing of DNA depends on the stability of the bridging phosphate-metal ion-phosphate bonds of DNA based on electron delocalization in d-orbital conjugation of metal ions.

关键词： chirality DNA DNA-metal ions interaction silica ultra-small metal-nanoparticle