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Fabrication of UV responsive micelles-containing multilayers and their influence on cell adhesion

Science China Chemistry 2018年第1期61卷 54-63页

作者： Haolan Zhang Danyu Wang Xue Lin Nikolaos Politakos Jimena S. Tuninetti Sergio Enrique Moya Changyou Gao Key Laboratory of Macromolecular Synthesis and Functionalization Ministry of Education Department of Polymer Science and Engineering Zhej iang University Hangzhou 310027 China Centre for Cooperative Research in Biomaterials San Sebastian 20009 Gipuzkoa Spain Dr. Li Dak Sum & Iqp Chin Center for Stem Cell and Regenerative Medicine Zhejiang University Hangzhou 310058 China

multilayers incorporated with stimuli-responsive substances by means of layer-by-layer(LbL) self-assembly are much attractive due to their advantages of stimuli-responsiveness and potential applications in different fields. In this study, pyrenemethyl acrylate(PA) was synthesized, and was copolymerized with acrylic acid(AA) to obtain the amphiphilic and photodegradable P(PA-co-AA)polymers with a PA:AA molar ratio of 1.3:3, and an average molecular weight of 6.9 kDa and polydispersity index of 1.04. They formed micelles spontaneously when dispersed in aqueous solution with a size of 27.5 nm in a dry state and 136.6 nm in a wet state. The micelles were readily decomposed to form aggregates as a result of the cleavage of the pyrenemethyl ester bonds under UV-irradiation. UV-responsive micelles-containing multilayers were prepared by LbL self-assembly of the UV-responsive micelles and polyallylamine hydrochloride(PAH). UV-irradiation of the multilayers resulted in the decomposition of micelles, leading to larger surface roughness, and enhanced swelling ratio and wettability of the multilayers. In vitro culture of A549, HepG2 and endothelial cells showed significantly better adhesion at 4 h on the UV-illuminated multilayers, whereas the cell proliferation was not affected significantly until 5 d.

关键词： biomaterials multilayers surfaces photo-responsive cell adhesion

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Structure and Growth Mechanism of V/Ag multilayers with Different Periodic Thickness Fabricated by Magnetron Sputtering Deposition

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Journal of Materials Science & Technology 2014年第10期30卷 1012-1019页

作者： Hongxiu Zhang Feng Ren Mengqing Hong Xiangheng Xiao Guangxu Cai Changzhong Jiang School of Physics and Technology Center for Ion Beam Applicationand Center for Electron MicroscopyWuhan University

V/Ag multilayers with different periodic thicknesses were fabricated by magnetron sputtering deposition. The columnar structure and the orientation relationship of the multilayers were investigated by transmission electron microscopy, high resolution transmission electron microscopy, selected-area electron diffraction and X-ray diffraction. It was found that the multilayered structure became flatter as increasing individual layer thickness from 2 to 6 nm, and then became waved as the individual layer thickness increases to 8 nm. At the beginning of the growth, the morphology of the multilayers with small periodic thickness was influenced mainly by thermodynamic instabilities, and the morphology of the multilayers with larger periodic thickness was mainly influenced mainly by the columnar growth of V. When the waved interfaces were formed, the continuum growth of the multilayers was also influenced by the shadowing effect and the finite atomic size effect. All of these factors resulted in the columnar structure of the multilayers. multilayers with small periodic thickness presented strong orientation relationship. Nano-hardness tests indicated that multilayers with flat sublayer morphology and clear interfaces exhibited larger hardness.

关键词： multilayers Interfaces Columnar structure Transmission electron microscopy

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Structural transition and magnetic properties of evaporated Fe/Gd multilayers

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Rare Metals 2008年第5期27卷 484-489页

作者： YANG Peiyong SONG Cheng ZENG Fei PAN Feng Laboratory of Advanced Materials Department of Materials Science and Engineering Tsinghua University Beijing 100084 China

Fe/Gd multilayers were prepared by alternate vapor deposition of pure Fe and Gd at a rate of 0.01-0.03 nm/s in an ultra-high-vacuum elec- tron-gun evaporation system. The effects of the constituent metal layer thickness on the microstructures and magnetic properties of the films were investigated by low angle X-ray diffraction, transmission electron microscopy, and vibrating sample magnetometer. The experimental results show that a transition from the polycrystalline to amorphous state in the Fe layers occurs with the decrease of Fe layer thickness in the Fe/Gd multilayers. The saturation magnetization of the multilayers reduces significantly with decreasing Fe layer thickness and increasing Gd layer thickness. A superparamagnetic behavior at room temperature is observed for the [Fe（0.6 nm）/Gd（4.0 nm）]15 multilayer due to the formation of discontinuous Fe layers.

关键词： multilayers amorphous state magnetization microstructure thin film

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Three-and two-dimensional calculations for the interface anisotropy dependence of magnetic properties of exchange-spring Nd2Fe(14)B/α-Fe multilayers with out-of-plane easy axes

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Chinese Physics B 2020年第3期29卷 389-395页

作者： Qian Zhao Xin-Xin He Francois-Jacques Morvan Guo-Ping Zhao Zhu-Bai Li Inner Mongolia Key Laboratory for Utilization of Bayan Obo Multi-Metallic Resources Elected State Key LaboratoryDepartment of Applied PhysicsCollege of ScienceInner Mongolia University of Science and TechnologyBaotou 014010China Ningbo Institute of Industrial Technology Chinese Academy of SciencesNingbo 315201China College of Physics and Electronic Engineering Sichuan Normal UniversityChengdu 610066China

Hysteresis loops,energy products and magnetic moment distributions of perpendicularly oriented Nd2Fe(14)B/α-Fe exchange-spring multilayers are studied systematically based on both three-dimensional(3D)and one-dimensional(1D)micromagnetic methods,focused on the influence of the interface *** calculated results are carefully compared with each *** interface anisotropy effect is very palpable on the nucleation,pinning and coercive fields when the soft layer is very ***,as the soft layer thickness increases,the pinning and coercive fields are almost unchanged with the increment of interface anisotropy though the nucleation field still monotonically *** interface anisotropy decreases the maximum energy products and increases slightly the angles between the magnetization and applied *** magnetic moment distributions in the thickness direction at various applied fields demonstrate a progress of three-step magnetic reversal,i.e.,nucleation,evolution and irreversible motion of the domain *** above results calculated by two models are in good agreement with each ***,the in-plane magnetic moment orientations based on two models are *** 3D calculation shows a progress of generation and disappearance of vortex state,however,the magnetization orientations within the film plane calculated by the 1D model are *** results suggest that negative interface anisotropy is necessarily avoided experimentally.

关键词： micromagnetics interface anisotropy Nd2Fe(14)B/α-Fe multilayers magnetic properties

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Microstructure and In-plane Resistivity of Cu/Ni multilayers

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Journal of Materials Science & Technology 1999年第1期15卷 75-78页

作者： Wang, Wei Huang, Rongfang Wen, Lishi Guo, Liping Wang, Wenkui Chinese Acad Sci Inst Met Res Shenyang 110015 Peoples R China Chinese Acad Sci Inst Phys Beijing 100080 Peoples R China

The Cu/Ni multilayers were deposited using ion beam sputtering at room temperature and 250 degree C respectively. The microstructure of the multilayers including interfacial roughness, grain size and growth direction has been investigated by transmission electron microscopy and X-ray diffraction. The microstructure depends strongly on the substrate temperature and modulation wavelength, bigger grain size and larger interfacial roughness were obtained when the multilayers were deposited at 250 degree C, and the multilayers ceased to grow epitaxially due to the increasing defects in the multilayers. The resistivity of the multilayers is very sensitive to the microstructure due to the size-effect. In order to study the influence of the microstructure on the resistivity, the in-plane resistivity of Cu/Ni multilayers was measured using four-point probe. The resistivity increases with higher substrate temperature, and it decreases when the modulation wavelength becomes short. The interfacial roughness and grain size have co-contribution to the resistivity. The interface scattering is the main factor which has effect on the resistivity of Cu/Ni multilayers. (Edited author abstract) 13 Refs.

关键词： multilayers

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Giant Magnetoresistance Effect of [bcc-Fe(M)/Cu](M=Co,Ni) multilayers

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Journal of Materials Science & Technology 2000年第2期16卷 186-190页

作者： M.Matsui, M.Doi and N.Shimizu (Department of Crystalline Materials Science and Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan Department of Crystalline Materials Science and Engineering Nagoya University Chikusa-ku Nagoya 464-8603 Japan

GMR effect of multilayers of bcc-Fe(M)(M=Co, Ni) alloy and Cu layers has been investigated. The maximum MR ratio is found at 1.1 nm Fe(Co) and 1.3～1.4 nm Cu layer thickness in [Fe(Co)/CuJ, and at 1.6 nm Fe(Ni) and 1.4 nm Cu layer thickness in [Fe(Ni)/Cu]. Under the optimum annealing condition, the MR ratio increases up to 50% and 38% for Fe(Co) and Fe(Ni) systems, respectively. The origin of the increase of GMR is discussed, taking the progress of preferred orientation of Fe(Co)[100] or Fe(Ni)[100] by anneahng into account.

关键词： Giant Magnetoresistance Effect of M=Co,Ni multilayers Cu bcc-Fe

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Perpendicular exchange bias of (Pt/Co)_n/FeMn multilayers

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Journal of University of Science and Technology Beijing 2007年第6期14卷 543-546页

作者： Zhonghai Zhai Yang liu Jiao Teng Baohe Li Guanghua Yu Fengwu Zhu Materials Science and Engineering School University of Science and Technology Beijing Beijing 100083 China College of Science Shenyang Jianzhu University Shenyang 110168 China Department of Mathematics and Physics Beijing Technology and Business University Beijing 100037 China

（Pt/Co）n/FeMn multilayers with perpendicular anisotropy （PA） were prepared by magnetron sputtering with Pt as the buffer layer and the capping layer. The dependence of perpendicular exchange bias （PEB）, Hex, on the thickness of the FeMn anfiferromagnet （AFM） layer is similar to that of in-plane exchange bias. The value of Hex for the （Pt/Co）3/FeMn multilayer reaches 22.3 kA/m. A thin Pt spacer was inserted between the Co/FeMn interface to enhance PEB. The PEB reaches the largest at 39.8 kA/m when the thickness of the Pt spacer is 0.4 nm.

关键词： exchange bias perpendicular anisotropy texture multilayers

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Auto-correlation Effects on the sp^3-d Exchange Interaction in Cd1-x MnxTe/CdTe multilayers

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Chinese Physics Letters 2002年第11期19卷 1679-1682页

作者： K. Afif, A. Benyoussef and J. Diouri Laboratoire de Magnetisme Faculte des Sciences Groupe d"Electronique et de Physique du Solide Faculte des Sciences

Band offsets and total energy of Wannier excitons in multilayers are affected by dimensional and auto-correlation effects, and sp^3-d coupling is consequently modified. Thus, the calculation of the Zeeman splitting in the quantum wells has to take into account these effects, especially when the mismatch cannot be disregarded. In this work, the theoretical study of these combined effects has been performed for Cd1-xMnxTe/CdTe multilayers embedded by Cd1-yZnyTe as the substrate (or the buffer) on one side and as a cladding layer on the other side. This sample allows us to highlight the role played by the substrate (buffer) and the growth direction on the Zeeman splitting in such multilayers

关键词： multilayers

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Perpendicular magnetic anisotropy of Co_(85)Cr_(50)/Pt multilayers

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Journal of University of Science and Technology Beijing 2004年第4期11卷 319-323页

作者： PolHwang BaoheLi TaoYang ZhonghaiZhatt FengwuZhut DepartmentofPhysics KimI1SungUniversityPyongyangDPRK MaterialsScienceandEngineeringSchool UniversityofScienceandTechnologyBeijingBeijing100083China DepartmentofPhysicsandMathematics BeijingTechnologyandBusinessUniversityBeijing100037China

The CoCr/Pt bilayers and (CoCr/Pt)_(20) multilayers with Pt underlayer wereprepared by DC magnetron sputtering. The effects of prepared condition on perpendicular magneticanisotropy were investigated. The results show that the thickness of Pt under-layer has a greateffect on the microstructure and perpendicular magnetic anisotropy of CoCr/Pt bilayers and(CoCr/Pt)_(20) multilayers. When the thickness of Pt underlayer increases, Pt(lll) and CoCr(002)peaks of both CoCr/Pt bilayers and (CoCr/Pt)_(20) multilayers increase and the bilayer periodicityof the multilayers is improved. The effective magnetic anisotropy of (CoCr/Pt)_(20) multilayers withPt underlayer was much larger than that of CoCr/Pt bilayers. The (CoCr/Pt)_(20) multilayers has astronger perpendicular magnetic anisotropy than that of CoCr/Pt bilayers. This is ascribed to theinterface magnetic anisotropy of the multilayers.

关键词： multilayers perpendicular magnetic anisotropy effective magnetic anisotropyconstant interface magnetic anisotropy

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Ag/Si multilayers with nanometer sized particles of silver during annealing process

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Science China Mathematics 1998年第9期41卷 989-994页

作者：赵建华张明曹立民张湘义刘日平戴道阳陈红许应凡王文魁 1. Institute of Physics Chinese Academy of Sciences 100080 Beijing China 2. Institute of Materials Science and Engineering Yanshan University 06604 Qinhuangdao China

Thein situ low angle X-ray diffraction and transmission electron microscopy were used to monitor the interdiffusion characteristics as well as the microstructure in Ag/Si multilayers with modulated wavelength 7. 64 nm when annealing from 323 to 573 K. The interdiffusion mechanism of Ag/Si multilayers with immiscibility is different from that of other metal/Si multilayers which are miscible. Phase separation takes place at 323 K, then silicon atoms diffuse into silver sublayers through silver grain boundaries and separate silver sublayers into nanometer sized silver particles gradually at higher temperature. The mean size of silver particles is about 5 nm. The activation energy and frequency factor are determined to be 0.24 eV and 2.02 x?20m2/s, respectively.

关键词： Ag/Si multilayers with nanometer sized grains of silver diffusion in situ low angle X\|ray diffraction.

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