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苎麻残胶率测试结果的影响因素及测试方法优化

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印染助剂 2024年第3期41卷 48-53页

作者：刘桂凤郑琰珍武雪泰安市食品药品检验检测研究院(泰安市纤维检验所) 山东泰安271000

按照GB/T 5889—1986中的方法对测试步骤进行了优化改进,按照优化改进后的测试方案测试苎麻样品的残胶率,并对实验数据进行统计分析及不确定度评估。结果表明,改进后的测试方法测试数据更加准确,测试时间大幅缩短,有效提高了工作效率。

关键词：苎麻残胶率不确定度改进方法

Physiological and psychological responses to tended plant communities with varying color characteristics

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Journal of Forestry Research 2024年第1期35卷 183-201页

作者： Siyuan zheng yanzhen Zhou Haiyan Qu School of Architecture and Urban Planning Shenyang Jianzhu UniversityShenyang 110168People’s Republic of China

Exposure to plants has been reported to promote health and reduce stress,and plant color has direct impacts on physical and mental *** used images of common types of tended plant communities in Shenyang,China,with combinations of yellow,green,and red foliage,as experimental stimuli.A total of 27 images were used as visual *** used electroencephalography to measureαwave activity(8-13 Hz)in 40 subjects while they viewed visual *** data were combined with subjective questionnaire data to analyze the relaxing effect of images of tended plant communities with different color types and proportions on *** results revealed that,although there were slight differences between the electroencephalography and psychological findings,women were significantly more relaxed than men after viewing the *** and psychological responses varied with the types and proportions of colors in the tended plant communities:those of foliage with combinations of two or three colors induced stronger responses than images with a single ***,(1)for one-color plant communities,green or yellow plant communities induced a stronger relaxation effect than red plant communities;(2)for two-color plant communities,the optimal color proportion was 55%+45%,and the green+yellow and green+red color combinations induced a stronger relaxation effect;(3)for three-color plant communities,the relaxation effect was strongest when the color proportion was 55%green+25%yellow+20%*** data would provide a plant color matching in future plant landscape design,which may be helpful for creating healthy and relaxing environments.

关键词： Plant community Color type Color ratio Electroencephalography Subjective questionnaire

Computational studies of the structure and cation-anion interactions in 1-ethyl-3-methylimidazolium lactate ionic liquid

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Science China Chemistry 2012年第8期55卷 1548-1556页

作者： HE HongYan zheng yanzhen CHEN Hui ZHANG XiaoChun YAO XiaoQian ZHANG SuoJiang Beijing Key Laboratory of Ionic Liquids Clean Process Chinese Academy of SciencesBeijing 100190China College of chemistry and Chemical Engineering Graduate University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Bioorganic Phosphorous Chemistry and Chemical Biology Department of ChemistryTsinghua UniversityBeijing 100084China

Quantum chemical calculations of the structures and cation-anion interaction of 1-ethyl-3-methylimidazolium lactate ([Emim][LAC]) ion pair at the B3LYP/6-31++G** theoretical level were performed. The relevant geometrical characteristics, energy properties, intermolecular H-bonds (H-bonds), and calculated IR vibrations with respect to isolated ions were systematically discussed. The natural bond orbital (NBO) and atoms in molecule (AIM) analyses were also employed to understand the nature of the interactions between cation and anion. The five most stable geometries were verified by analyzing the relative energies and interaction energies. It was found that the most of the C-H···O intermolecular H-bonds interactions in five stable conformers have some covalent character in nature. The elongation and red shift in IR spectrum of C-H bonds which involve in H-bonds is proved by electron transfers from the lone pairs of the carbonyl O atom of [LAC] to the C-H antibonding orbital of the [Emim]+. The interaction modes are more favorable when the carbonyl O atoms of [LAC] interact with the C2-H of the imidazolium ring and the C-H of the ethyl group through the formation of triple H-bonds.

关键词： interionic interaction structure hydrogen bond lactate-based ionic liquid quantum chemical calculations

Hendecanuclear [Cu_(6)Gd_(5)] magnetic cooler with high molecular symmetry of D_(3h)

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Chinese Chemical Letters 2021年第2期32卷 838-841页

作者： Weipeng Chen Guojun Zhou Zhuolun Gou Sen Wang Yuanqi Zhai Tian Han Jurgen Schnack yanzhen zheng Shenzhen Research School and Frontier Institute of Science and Technology(FIST) State Key Laboratory for Mechanical Behavior of MaterialsMOE Key Laboratory for Nonequilibrium Synthesis of Condensed MatterXi'an Key Laboratory of Sustainable Energy and Materials Chemistry and School of ScienceXi'an Jiaotong University.Xi'an 710054China School of Chemistry and Chemical Engineering Shaanxi Normal UniversityXi'an 710119China Faculty of Physics Bielefeld UniversityD-33501 BielefeldPO Box 100131Germany

A new family of isostructural 3 d-4 f polymetallic complexes,formulated as [Cu_(6)Ln_(5)(μ_(3)OH)_(9)(C_(4)H_(8)O_(2)N)_(6)(C_(5)H_(4)ON)_(6)(H_(2)O)_(9)]·(ClO_(4))_(6)·(H_(2)O)_(22)(Ln=Pr,1;Nd,2;Sm,3;Eu,4;Gd,5),was successfully isolated through the simple hydrolysis reaction of 2-aminoisobutyric acid,2-hydroxypyridine,Cu(CH_(3)COO)_(2)·H_(2)O,and Ln(ClO_(4))_(3)·6 H_(2)***,the [Cu_(6)Ln_(5)] clusters with high molecular symmetry of D_(3h) are rare examples of2-aminoisobutyric acid-based 3 d-4 f *** successful theoretical modeling of 5 yielded that the Gd-Gd exchange is of order 0.2 K,whereas the Gd-Cu exchange is an order of magnitude *** data collected for comp lex 5 yield a magnetic entropy change(-ΔSm) of 19.6 J kg^(-1) K^(-1)<1 at 3 K and 7 T,which may be attributed to the weak magnetic interactions between the component metal ions.

关键词： Polymetallic complexes Lanthanide elements Hydrothermal reaction Magnetic interactions Magnetic refrigeration

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甲酸/氯化锌法定量分析棉氨纶产品的探讨

棉纺织技术 2024年第9期52卷 60-63页

作者：刘桂凤郑琰珍张琪杜学慧朱振泰安市食品药品检验检测研究院山东泰安271000 泰安市质量技术检验检测研究院山东泰安271000

针对目前棉氨纶产品检测过程中拆分法费时、费力、检测效率低下,二甲基甲酰胺溶解法测试时间长,测试结果偏差大的问题,采用甲酸/氯化锌溶液对氨纶进行溶解,以便更加准确、快捷地测定棉氨纶产品的混纺比,对溶解温度、溶解时间、棉纤维的... 详细信息

针对目前棉氨纶产品检测过程中拆分法费时、费力、检测效率低下,二甲基甲酰胺溶解法测试时间长,测试结果偏差大的问题,采用甲酸/氯化锌溶液对氨纶进行溶解,以便更加准确、快捷地测定棉氨纶产品的混纺比,对溶解温度、溶解时间、棉纤维的修正系数进行了试验验证,确定最佳的试验参数组合,检测结果与拆分法和二甲基甲酰胺溶解法进行比较,对偏差产生的原因进行了分析,并通过实验室间比对,对测试方法的可行性和再现性进行了验证。结果表明:棉氨纶织物用甲酸/氯化锌法进行定量测试是准确、可行的;试验温度为(50±2)℃、试验时间为25min,该方法溶解时间短、操作简便,准确度与精密度高,再现性良好。

关键词：棉/氨纶纤维含量定量分析甲酸/氯化锌法二甲基甲酰胺法

Rigid Dysprosium(Ⅲ)Single-Molecule Magnets Exhibit Preserved Superparamagnetism in Solution

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Chinese Journal of Chemistry 2022年第5期40卷 563-570页

作者： Xiali Ding Qiancheng Luo Yuanqi Zhai Xufeng Zhang Yi Lv Xinliang Zhang Chao Ke Chao Wu yanzhen zheng Frontier Institute of Science and Technology(FIST) State Key Laboratory of Mechanical Behavior for MaterialsMOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed MatterXi'an Key Laboratory of Sustainable Energy and Materials ChemistrySchool of Chemistry and School of PhysicsXi'an Jiaotong University99 Yanxiang RoadXi'anShaanxi710054 China Department of Hepatobiliary Surgery and The First Affiliated Hospital of Xi'an Jiaotong University 277 West Yanta RoadXi'anShaanxi710061 China Department of Spine Surgery Honghui HospitalXi'an Jiaotong University76 Nanguo RoadXi'anShaanxi710054 China Department of Orthopaedics and Trauma Hong Hui HospitalCollege of MedicineXi'an Jiaotong University555 East Youyi RoadXi'anShaanxi710054 China

Molecules with long preserved magnetic moments are perceived as the smallest units for storing bytes,which could bring a new revolution for information ***,the rational design of such molecules remains *** two rigid adamantanol ligand based dysprosium(III)complexes([Dy(1-AdO)_(2)(py)_(5)]BPh_(4)-1 and[Dy(2-AdO)_(2)(py)_(5)]BPh_(4)-2)with pentagonal-bipyramidal coordination geometry and local D5h symmetry were successfully prepared,which display excellent single-molecule magnet(SMM)behavior(U_(eff)≈1835 K,T_(B)_(ZFC)≈24 K,T_(B)^(100s)≈17 K and T_(B)^(H)=23 K for 1;U_(eff)≈1756 K,T_(B)^(ZFC)≈20 K,T_(B)^(100s)≈16 K and T_(B)^(H)=23 K for 2)due to the much weakened vibration in low energy ***,the large energy barriers and high blocking temperatures for these two complexes in solid states are well preserved in *** is never observed in previous studies of SMMs,indicating that the adamantanol is rigid and can be introduced to make the composed molecules stable enough to maintain the solid state magnetic property in solution.

关键词： Molecularmagnets Lanthanide D_(sh)-symmetry Superparamagnetism Solution

Hybrid Bioelastomer Reinforced by Ultrathin Nanowires of Lanthanide Hydroxycarbonates for Promising Biomedical Applications

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CCS Chemistry 2022年第3期4卷 926-937页

作者： Xinyu Zhang Yannan Li Juan Ge Lei Qin yanzhen zheng Bo Lei Zhiping zheng Yaping Du Frontier Institute of Science and Technology Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine ResearchCollege of StomatologyXi’an Jiaotong UniversityXi’anShaanxi 710054 Department of Chemistry and Shenzhen Grubbs Institute Southern University of Science and TechnologyShenzhen 518000 School of Physical Science and Technology Inner Mongolia UniversityHohhot 010021 Tianjin Key Lab for Rare Earth Materials and Applications Center for Rare Earth and Inorganic Functional MaterialsSchool of Materials Science and EngineeringNational Institute for Advanced MaterialsNankai UniversityTianjin 300350

Hybrids composed of biocompatible polymers reinforced with inorganic nanomaterials are useful for many biomedical applications including implantation and tissue regeneration and *** this work,we report a new type of hybrid prepared by doping ultrathin nanowires of lanthanide hydroxycarbonates into classical biocompatible poly(citrates-siloxane).The doping of the inorganic nanowires imparts the hybrids with excellent miscibility with the polymeric matrix,producing hybrids with high elasticity and high tensile *** hybrids containing Eu(III)and Gd(III)display their respective luminescence and magnetic properties and thus,offer opportunities to monitor the fate of such hybrids when used in *** degradation and excellent biocompatibility of these hybrids have also been ***,these favorable traits portend useful applications of the newly developed hybrid elastomers.

关键词： lanthanides hybrid elastomer ultrathin nanowires biomedical application

A perfect linear dimer bridged by one chloride seven-coordinate DyⅢ single-molecule magnet

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A perfect linear dimer bridged by one chloride seven-coordin...

化学气相沉积低温各向同性热解炭微观结构及沉积机制

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作者： Xiali Ding yanzhen zheng Frontier Institute of Science and Technology (FIST) Xi’an Jiaotong University

A single chloride-bridged centrosymmetric dimer {[Dy(OBu)(4-NHPy)](μ-Cl)}[(BPh)] with each Dy being seven-coordinated has been isolated using bulky hindered sodium tert-butoxide as axial ligands and neutral 4-aminopyridine as equatorial plane ligands by one-pot method. The configuration is quite regular composed with two C local-symmetry structures, exhibiting perfect linear linking coordinated with an axial Dy1-Cl-Dy2 angles is 179.4°. Magnetic studies revealed that this complex exhibits a slow magnetic relaxation of a single-ion origin together with a S-shape magnetic hysteresis of the magnetic coupled cluster. The thermal relaxation barrier of magnetization is 371 K in the absence of a static magnetic field, while the intramolecular magnetic interaction is weaker by one Cl-ion transmitted in the dimer.

关键词： single-molecule magnet dinuclear DyⅢ chloride-bridged magnetization

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复合材料学报 2016年第8期33卷 1812-1818页

作者：张建辉郑艳真杭州电子科技大学机械工程学院杭州310018

为了研究低温各向同性热解炭(LTIC)的微观结构及沉积机制,采用不同体积分数的丙烷为碳源,在不同的沉积温度下进行稳态流化床化学气相沉积实验制备LTIC,借助SEM和TEM对不同沉积条件下制备的LTIC微观结构进行表征和分析。结果表明:不同沉... 详细信息

为了研究低温各向同性热解炭(LTIC)的微观结构及沉积机制,采用不同体积分数的丙烷为碳源,在不同的沉积温度下进行稳态流化床化学气相沉积实验制备LTIC,借助SEM和TEM对不同沉积条件下制备的LTIC微观结构进行表征和分析。结果表明:不同沉积条件下制备的LTIC由类球形颗粒状和片层状炭结构组成,沉积温度升高,降低了热解炭在气相中的形核势垒,LTIC中类球形颗粒数量增多,尺寸变小,且类球形颗粒内包围炭黑颗粒的炭层织构逐渐降低;丙烷体积分数升高,热解炭沉积过程逐渐由以表面生长机制为主转变为以气相形核机制为主,所制备的LTIC中类球形颗粒形貌越来越明显,而片层状炭结构逐渐减少甚至完全消失。

关键词：化学气相沉积流化床低温各向同性热解炭沉积条件微观结构沉积机制