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Wester de Poel Sander J. T. Brugman Kim H. A. van de Ven Anouk Gasseling Jordi de Lange Eleanor R. Townsend Anthonius H. J. Engwerda Maciej Jankowski Melian A. R. Blijlevens Ben L. Werkhoven Jakub Drnec Francesco Carl Roberto Felici Aashish Tuladhar Narendra M. Adhikari James J. De Yoreo Johannes A. A. W. Elemans Willem J. P. van Enckevort Alan E. Rowan Elias Vlieg 《Angewandte Chemie (International ed. in English)》2020,59(6):2323-2327
Organothiol monolayers on metal substrates (Au, Ag, Cu) and their use in a wide variety of applications have been extensively studied. Here, the growth of layers of organothiols directly onto muscovite mica is demonstrated using a simple procedure. Atomic force microscopy, surface X‐ray diffraction, and vibrational sum‐frequency generation IR spectroscopy studies revealed that organothiols with various functional endgroups could be self‐assembled into (water) stable and adaptable ultra‐flat organothiol monolayers over homogenous areas as large as 1 cm2. The strength of the mica–organothiol interactions could be tuned by exchanging the potassium surface ions for copper ions. Several of these organothiol monolayers were subsequently used as a template for calcite growth. 相似文献
53.
Santanu Bhattacharya Anindya Datta Sandip Dhara Dipankar Chakravorty 《Journal of Raman spectroscopy : JRS》2011,42(3):429-433
Raman scattering studies were performed in GaN nanoribbons grown along [1 0 0]. These samples were prepared inside Na‐4 mica nanochannels by the ion‐exchange technique and subsequent annealing in NH3 ambient. Detailed morphological and structural studies including the crystalline orientation were performed by analyzing the vibrational properties in these GaN nanoribbons. Pressure in the embedded structure was calculated from the blue shift of the E2(high) phonon mode of GaN. Possible red shift of optical phonon modes due to the quantum confinement is also discussed. In addition to the optical phonons allowed by symmetry, two additional Raman peaks were also observed at ∼633 and 678 cm−1 for these nanoribbons. Calculations for the wavenumbers of the surface optical (SO) phonon modes in GaN in Na‐4 mica yielded values close to those of the new Raman modes. The SO phonon modes were calculated in the slab (applicable to belt‐like nanoribbon) mode, as the wavenumber and intensity of these modes depend on the size and the shape of the nanostructures. The effect of surface‐modulation‐assisted electron–SO phonon scattering is suggested to be responsible for the pronounced appearance of SO phonon modes. A scaling factor is also estimated for the interacting surface potential influencing the observed SO Raman scattering intensities. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
54.
The interfacial interaction and orientation of filler play important roles in the enhancement of mechanical performances for polymer/inorganic filler composites. Shear has been found to be a very effective way for the enhancement of interfacial interaction and orientation. In this work, we will report our recent efforts on exploring the development of microstructure of high density polyethylene (HDPE)/mica composites in the injection‐molded bars obtained by so‐called dynamic packing injection molding (DPIM), which imposed oscillatory shear on the melt during the solidification stage. The mechanical properties were evaluated by tensile testing and dynamic mechanical analysis (DMA), and the crystal morphology, orientation, and the dispersion of mica were characterized by scanning electron microscopy and two‐dimensional wide‐angle X‐ray scattering. Compared with conventional injection molding, DPIM caused an obvious increase in orientation for both HDPE and mica. More importantly, better dispersion and epitaxial crystallization of HDPE was observed on the edge of the mica in the injection‐molded bar. As a result, increased tensile strength and modulus were obtained, accompanied with a decrease of elongation at break. The obtained data were treated by Halpin–Tsai model, and it turned out that this model could be also used to predict the stiffness of oriented polymer/filler composites. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
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采用液相沉积法制备了氧化锌(ZnO)纳米棒负载云母复合粉体,其合成工艺分为:(1)云母粉体表面沉积ZnO纳米粒子,并经煅烧制得表面晶种化的云母粉体;(2)以七水硫酸锌(ZnSO4·7H2O)为前驱体,乙醇胺和氨水为络合剂,制得液相沉积前驱体溶液,并在晶种化的云母粉体表面沉积ZnO纳米棒。利用X-射线衍射(XRD)、ζ电位仪、扫描电子显微镜(SEM)以及红外发射率测试仪对氧化锌/云母复合粉体进行了测试与表征。结果表明,云母分散于乙醇水体积比为1∶1的混合溶液中,其表面带负电(-37 mV),而ZnO粒子表面则带正电(16 mV);两种粒子混合时,可通过静电引力实现ZnO纳米粒子在云母表面沉积;随着云母表面ZnO纳米棒沉积密度的增大,复合粉体在8~14μm波段内的红外发射率逐渐增大,从0.800增加至0.863;对比棒状ZnO球体,结构单元聚集状态的变化对最终红外发射性能的影响不大。 相似文献
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58.
S. R. Hashemi-Nezhad 《Radiation measurements》1997,28(1-6):167-170
Studies on the shape of etched fission tracks in crystalline detectors show that the track geometry carries valuable information on the crystal structure of the detector involved. The geometry of the etched tracks in crystalline detectors is a prism formed of certain crystal planes. In mica detectors, for given etching conditions the type and number of the planes depend on the incident angle and the extent of the radiation damage along the track. In a single track the type of crystal planes forming the track prism may change along the track resulting in dramatic variations of the track geometry at certain depth of focus. 相似文献
59.
Dr. Wester de Poel Dr. Johannes A. A. W. Elemans Dr. Willem J. P. van Enckevort Prof. Dr. Alan E. Rowan Prof. Dr. Elias Vlieg 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(15):3756-3760
Two-dimensional polymers (2DP) are a new class of materials that consist of a monolayer of ordered molecular building blocks, which have been covalently linked. One of these monomers was self-assembled on a flat muscovite mica scaffold and subsequently the organic layer was polymerized. The resulting flat and stable 2DP layer was used as a template for protein crystallization. Crystals of insulin were epitaxially grown on the template, whereas insulin crystals grown on clean muscovite mica had a random orientation. The template was selective, considering that no epitaxially ordered crystals formed of hen egg white lysozyme, bovine serum albumin, or talin. 相似文献
60.
We report that the surface chemical properties of muscovite mica [KAl2(Si3Al)O10(OH)2] like important multi-elemental layered substrate can be precisely tailored by ion bombardment. The detailed X-ray photoelectron spectroscopic studies of a freshly cleaved as well as 12-keV Ar+ and N+ ion bombarded muscovite mica surfaces show immense changes of the surface composition due to preferential sputtering of different elements and the chemical reaction of implanted ions with the surface. We observe that the K atoms on the upper layer of mica surface are sputtered most during the N+ or Ar+ ions sputtering, and the negative aluminosilicate layer is exposed. Inactive Ar atoms are trapped, whereas chemically reactive N atoms form silicon nitride (Si3N4) and aluminum nitride (AlN) during implantation. On exposure to air after ion bombardment, the mica surface becomes more active to adsorb C than the virgin surface. The adsorbed C reacts with Si in the aluminosilicate layer and forms silicon carbide (SiC) for both Ar and N bombarded mica surfaces. Besides the surface chemical change, prolonged ion bombardment develops a periodic ripple like regular pattern on the surface. 相似文献