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New Applications of zirconium Phosphate Nanomaterials

Accounts of Materials Research 2021年第9期2卷 793-803页

作者： Mario V.Ramos-Garcés Julissa González-Villegas Aleannette López-Cubero Jorge L.Colón Cain Department of Chemical Engineering Louisiana State UniversityBaton RougeLouisiana 70803United States Department of Chemistry University of Puerto RicoSan JuanPuerto Rico 00925-2537United States

CONSPECTUS:The 2-D layers of the inorganic ion exchangerα-zirconium phosphate(Zr(HPO_(4))2·H_(2)O,α-ZrP)make this compound particularly stable to low pH,high temperature,and ionizing *** studied for its ion exchange properties,once the conditions for its synthesis in crystalline form was accomplished by James Stynes and Abraham Clearfield in 1964,numerous other types of studies and applications *** studies in the 1960s and 1970s on the thermodynamics of ion exchange led to insights into the intercalation mechanism of this *** Clearfield group solved the crystal structure in 1968 and refined it in *** methods were pioneered by the Clearfield group to solve the structure of this type of *** 1968 Giulio Alberti reported means to prepare zirconium phosphonates expanding the chemistry of these layered *** phases of ZrP were also discovered(e.g.,γ,θ,λ,τ)and the applications ranged from heterogeneous catalysis to intercalation chemistry and solid-state proton *** to exfoliate the layers of ZrP were developed in the 1990s as interest grew in new applications of these types of *** example,protein and enzyme intercalation was accomplished starting in the 1990s by the McLendon,Mallouk,and Kumar *** the early 2000s,the Colon group pioneered the use of théθphase of ZrP for the direct intercalation of large inorganic metal complexes that could not be directly intercalated into theα*** studies in the Colon group ranged from applications of these directly intercalated ZrP derivatives in photophysics and photochemistry,́amperometric biosensors,vapochromism,and *** the past decade,new applications of these materials have been developed in anticancer drug delivery and electrocatalysis of the oxygen evolution reaction(OER).ZrP has now proven to be a promising drug nanocarrier and its unique chemical microenvironment provided by theα-type layers and the interlay

关键词： properties zirconium inorganic

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A zirconium modified Co/SiO_2 Fischer-Tropsch catalyst prepared by dielectric-barrier discharge plasma

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Journal of Energy Chemistry 2013年第3期22卷 506-511页

作者： Yunhui Jiang Tingjun Fu Jing Lü Zhenhua Li Key Lab for Green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin University

Co/SiO2 and zirconium promoted Co/Zr/SiO2 catalysts were prepared using dielectric-barrier discharge （DBD） plasma instead of the conventional thermal calcination method. Fischer-Tropseh Synthesis （FTS） performances of the catalyst were evaluated in a fixed bed reactor. The results indicated that the catalyst treated by DBD plasma shows the higher FTS activity and yield of heavy hydrocarbons as compared with that treated by the conventional thermal calcination method. Increase in CO conversion was unnoticeable on the Co/SiO2 catalyst, but significant on the Co/Zr/SiO2 catalyst, both prepared by DBD plasma. On the other hand, heavy hydrocarbon selectivity and chain growth probability （a value） were enhanced on all the catalysts prepared by the DBD plasma. In order to study the effect of the DBD plasma treatment on the FTS performance, the catalysts were characterized by N2-physisorption, H2-temperature programed reduction （H2-TPR）, H2-temperature- programmed desorption （H2-TPD） and oxygen titration, transmission electron microscope （TEM） and X-ray diffraction （XRD）. It was proved that, compared with the traditional calcination method, DBD plasma not only could shorten the precursor decomposition time, but also could achieve better cobalt dispersion, smaller Co304 cluster size and more uniform cobalt distribution. However, cobalt reducibility was hindered to some extent in the Co/SiO2 catalyst prepared by DBD plasma, while the zirconium additive prevented significantly the decrease in cobalt reducibility and increased cobalt dispersion as well as the FTS performance.

关键词： Fischer-Tropsch synthesis cobalt silica zirconium dielectric-barrier discharge plasma

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Effects of tensile temperatures on phase transformations in zirconium by molecular dynamics simulations

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Journal of Central South University 2021年第7期28卷 1932-1945页

作者： AN Ke-ying OU Xiao-qin AN Xing-long ZHANG Hao NI Song SONG Min State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China

The effects of tensile temperatures ranging from 100 K to 900 K on the phase transition of hexagonal close-packed(HCP)zirconium were investigated by molecular dynamics simulations,which were combined with experimental observation under high resolution transmission electron *** results show that externally applied loading first induced the HCP to body-centered cubic(BCC)phase transition in the Pitsch-Schrader(PS)orientation relationship(OR).Then,the face-centered cubic(FCC)structure transformed from the BCC phase in the Bain ***,the HCP-to-BCC transition was incomplete at 100 K and 300 K,resulting in a prismatic-type OR between the FCC and original HCP ***,at the temperature ranging from 100 K to 600 K,the inverse BCC-to-HCP transition occurred locally following other variants of the PS OR,resulting in a basal-type relation between the newly generated HCP and FCC phases.A higher tensile temperature promoted the amount of FCC phase transforming into the BCC phase when the strain exceeded 45%.Besides,the crystal stretched at lower temperatures exhibits relatively higher strength but by the compromise of *** study reveals the deformation mechanisms in HCP-Zr at different temperatures,which may provide a better understanding of the deformation mechanism of zirconium alloys under different application environments.

关键词： zirconium phase transformation molecular dynamics simulation deformation mechanism tensile temperature

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Deformation twinning and textural evolution of pure zirconium during rolling at low temperature

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Transactions of Nonferrous Metals Society of China 2013年第10期23卷 2890-2895页

作者：栾佰峰叶青陈建伟余泓冰邹东利信运昌重庆大学材料科学与工程学院重庆400044

Industry pure zirconium sheets with a strong c-axis fiber texture were rolled to different strains at 77 K to investigate the twinning behavior and deformation mechanism. The microstructure and texture of the rolled specimens were characterized by scanning electron microscopy （SEM） together with electron backscatter diffraction （EBSD） techniques. The results show that the {1022} （1123） compression twinning mode is the dominant deformation twin at low strains loaded along the c-axis, and the {1012} （ 10]- 1 ） tensile twinning generates as the second twin in {1022} （ 1123 ） twins. The selection of twinning modes is governed by Schmid factor （SF） due to the calculating of SF and the EBSD simulating of twinning distribution. The evolution of texture during rolling affected by twins with increase of the strain was explained.

关键词： zirconium twinning texture rolling

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Effect of RF power on the properties of transparent conducting zirconium-doped zinc oxide films prepared by RF magnetron sputtering

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Chinese Physics B 2007年第2期16卷 548-552页

作者：吕茂水庞智勇修显武戴瑛韩圣浩 School of Physics and Microelectronics State Key Laboratory of Crystal Materials Shandong University Jinan 250100 China

Transparent and conducting zirconium-doped zinc oxide films with high transparency and relatively low resistivity have been successfully prepared by radio frequency （RF） msgnetron sputtering at room temperature, The RF power is varied from 75 to 150 W. At first the crystallinity and conductivity of the film are improved and then both of them show deterioration with the increase of the RF power, The lowest resistivity achieved is 2.07 × 10^-3Ωcm at an RF power of 100W with a Hall mobility of 16cm^2V^-1s^-1 and a carrier concentration of 1.95 × 10^20 cm^-3. The films obtained are polycryetalline with a hexagonal structure and a preferred orientation along the c-axis, All the films have a high transmittance of approximately 92% in the visible range. The optical band gap is about 3.33 eV for the films deposited at different RF powers.

关键词： sputtering zirconium zinc oxide transparent conducting films

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Anodic dissolution behavior of zirconium in Bu_4~nNBr-containing isopropanol solution

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Transactions of Nonferrous Metals Society of China 2016年第10期26卷 2738-2745页

作者：杨喜云黄海强杨声海中南大学冶金与环境学院长沙410083

Anodic dissolutionbehaviorof zirconium inBu^n 4NBr-contaningisopropanol solution was investigated using cyclic voltammetry, linear sweep voltammetry and chronoamperometry, complemented with a scanning electron microscope （SEM）.The voltammograms did not exhibit active dissolutionuntil the breakdown of passive layer induced by aggressive bromide *** images confirmed the existence of pits on zirconium *** depth and breadth of pits were intensified with increasing potential. The pitting potentialshifted negatively as either temperature orBu^n 4NBr concentration was increased, while it increased with increasing scan *** corrosion current density increased with increasing temperature. The apparent activation energyof anodic dissolutionofzirconiumwas 21.88kJ/mol. The chronoamperometry revealed that increasingBu^n 4NBrconcentration shortened the incubation time for passivity breakdown and accelerated the pit nucleation and growth. The experimental results were helpfulto obtain the optimum conditions for electrosynthesis of zirconium isopropoxide.

关键词： zirconium anodic dissolution pitting corrosion isopropanol tetrabutylammonium bromide

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Effect of zirconium addition on microstructure and mechanical properties of Mg_(97)Y_2Zn_1 alloy

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Transactions of Nonferrous Metals Society of China 2012年第4期22卷 773-778页

作者：陈彬卢晨林栋樑曾小勤上海交通大学材料科学与工程学院上海200240

The effects of zirconium addition on the microstructure and mechanical properties of Mg97Y2Zn1 alloy were *** microstructure of as-cast Mg97Y2Zn1 alloy is refined by the addition of *** the extrusion,the initial nucleation sites of the alloy are mainly original grain boundaries and secondary *** addition of zirconium could stimulate the DRX process because more grain boundaries are formed,which increases the dynamic recrystallization *** the strength and elongation of the alloy are increased by the addition of zirconium.

关键词： Mg97Y2Zn1 zirconium microstructure mechanical properties

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Surface finish effect on dry sliding wear behavior of thermally oxidized commercially pure zirconium

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Transactions of Nonferrous Metals Society of China 2019年第1期29卷 88-97页

作者： A.ALANSARI Y.SUN School of Engineering and Sustainable Development Faculty of Technology De Montfort University

The effect of surface polishing on the wear behavior of thermally oxidized commercial pure zirconium (CP-Zr) under dry sliding conditions was investigated. Surface ground CP-Zr with a roughness of 0.21 μm (Ra) was thermally oxidized (TO) at 650 °C for 6 h. After TO, some samples were polished to smoothen the surface with a finish of 0.04 μm (Ra). The response of the polished and unpolished TO samples to dry sliding wear was investigated under unidirectional sliding conditions. The results show that surface polishing after TO affects the dry sliding wear behavior of TO CP-Zr in several aspects, including coefficient of friction, wear rate, crack formation and oxide layer breakdown. In particular, it is found that smoothening the TO surface favors the formation of semi-circular cracks in the wear track and accelerates oxide layer breakdown during dry sliding. A slightly rough TO surface helps to reduce the tendency of the oxide layer towards cracking and to increase the wear resistance at high contact loads. The mechanisms involved are discussed in terms of asperity contacts, crack formation, propagation and final fracture.

关键词： zirconium thermal oxidation zirconium oxide surface finish friction wear

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HYDROBORATION OF ALKENES,ALKADIENES AND OXYGEN-CONTAINING UNSATURATED COMPOUNDS WITH SODIUM BOROHY-DRIDES CATALYZED BY zirconium COMPLEX

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Chinese Science Bulletin 1988年第15期33卷 1256-1261页

作者：吴绍祖去来川觉三大辻吉男 Department of Chemistry Lanzhou University Department of Applied Chemistry College of Engineering University of Osaka Prefecture Japan

We have previously reported that the Ti complex generated from Cp2TiCl2 and LiBH4 serves as a catalyst for hydroboration of alkenes. Sodium borohydride can also be utilized as a reagent for hydroboration if reaction i... 详细信息

关键词： hydroboration alkenes alkadienes zirconium chloride catalysis

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Study on Corrosion Resistance of N36 zirconium Alloy in LiOH Aqueous Solution

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World Journal of Nuclear Science and Technology 2018年第2期8卷 30-37页

作者： Chao Sun Zhongbo Yang Zongpei Wu Science and Technology on Reactor Fuel and Materials Laboratory Nuclear Power Institute of China Chengdu China

Zr-Sn-Nb-Fe alloys are one of the important directions for continuous improvement of zirconium alloys for high burn-up fuel assemblies. The corrosion resistance of Zr-Sn-Nb-Fe alloys is closely related to the alloying element and water chemical condition. To better understand the effect of Sn on corrosion resistance of Zr-Sn-Nb-Fe alloy, the normal N36 (Zr-1Sn-1Nb-0.3Fe) and low-tin N36 (Zr-0.8Sn-1Nb-0.3Fe) alloy sheets were prepared and tested in static autoclave in both of 0.01 mol/L LiOH and 0.03 mol/L LiOH aqueous solution at 360°C and 18.6 MPa. The characteristics of the microstructure and oxide film of alloys were analyzed by TEM and SEM respectively. It was shown that that the corrosion transition of the normal N36 appears earlier and the weight gain is higher than the low-tin N36 in two corrosive mediums. The cracks paralleling to the interface of oxide/metal are formed in the fracture surface of the oxide film and the micrographs at the oxide film/substrate interface appear uneven morphology. With the increasing of corrosion gain, there are more parallel cracks in oxide film and the uneven morphology at the oxide film/substrate interface is more obvious.

关键词： N36 zirconium Alloy Corrosion Oxide Films Morphology

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