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Mei Y Wu T Xu C Langenbach KJ Elliott JT Vogt BD Beers KL Amis EJ Washburn NR 《Langmuir : the ACS journal of surfaces and colloids》2005,21(26):12309-12314
A simple yet versatile method was developed to prepare a low-density polymerization initiator gradient, which was combined with surface-initiated atom transfer radical polymerization (ATRP) to produce a well-defined poly(2-hydroxyethyl methacrylate) (HEMA) gradient substrate. A smooth variation in film thickness was measured across the gradient, ranging from 20 A to over 80 A, but we observed a nonmonotonic variation in water contact angle. Fits of X-ray reflectivity profiles suggested that at the low graft density end, the polymer chain structure was in a "mushroom" regime, while the polymer chains at high graft density were in a "brush" regime. It was found that the "mushroom" region of the gradient could be made adhesive to cells by adsorbing adhesion proteins, and cell adhesion could be tuned by controlling the density of the polymer grafts. Fibroblasts were seeded on gradients precoated with fibronectin to test cellular responses to this novel substrate, but it was found that cell adhesion did not follow the expected trend; instead, saturated cell adhesion and spreading was found at the low grafting density region. 相似文献
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The electronegativity differences, N, between the anions and the cations in suggested resonating elements of some representative high-temperature superconductors with T
c - 10 K are evaluated adopting Pauling's scale. The relationship between N and T
c was found to separate all the examined high-T
csuperconductors onto two curves: One for the cuprate superconductors having two-dimensional layered structures was a straight line, T
c=29.8+4.1N; the other correlation curve representing the remaining compound superconductors including the doped 113 perovskite and the perovskite-related 214 structures was at lower T
c values but also suggested that increasing electronegativity differences was related to increasing T
c.This work was supported by the Director, Office of Energy Research, Office of Basic Energy Sciences, Materials Sciences Division of the U.S. Department of Energy under Contract No. DE-AC03-76SF00098 相似文献
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Wu G Cai ZW Bednarz MS Kocy OR Gavai AV Godfrey JD Washburn WN Poss MA Sher PM 《Journal of combinatorial chemistry》2005,7(1):99-108
Benzylic and allylic organozinc and Grignard reagents have been added to resin-bound imines to provide alpha-branched secondary amines. Many functional groups, including electrophilic groups, were compatible with this methodology. Three modules--a resin-bound primary amine, an aromatic aldehyde, and the organometallic--were independently varied to produce a combinatorial library of alpha-branched secondary amines designed as beta-3 adrenergic receptor agonists. 相似文献
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We report measurements of the shear modulus of each shell and the friction between the two shells of double-shell carbon nanotubes in single nanotube-based nanoelectromechanical devices operated in a transmission electron microscope. In situ nanobeam electron diffraction is applied to obtain the chiral indices of each shell of the nanotube and it allows us to establish a quantitative correlation between the atomic structure and properties of the nanotube under investigation. 相似文献
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S. Ruvimov Z. Liliental-Weber J. Washburn N. N. Ledentsov V. M. Ustinov V. A. Shchukin P. S. Kop’ev Zh. I. Alferov D. Bimberg 《Physics of the Solid State》1998,40(5):781-783
Self-organized nano-objects fabricated in different semiconductor systems are currently at the focus of scientific interest
because of their unique electronic properties. Transmission electron microscopy and high-resolution electron microscopy have
been used to study the InAs quantum dots grown by molecular-beam epitaxy (MBE) on GaAs and InP substrates. Optimal imaging conditions for visualization of quantum dots were established. Size, shape,
and stability of the equilibrium island arrays were analyzed with respect to the growth conditions. Both decrease and increase
of the As pressure compared to the optimal value were shown to destroy the regular arrangement of the islands. Energy benefit
due to the strain relaxation in the InAs islands is likely to be the driving force for their formation.
Fiz. Tverd. Tela (St. Petersburg) 40, 849–851 (May 1998)
Published in English in the original Russian journal. Reproduced here with stylistic changes by the Translation Editor. 相似文献
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