use of supported thin films of peptide amphiphiles as model systems of the extracellular matrix to study the effects of structure function phenomena on cell adhesion
The Materials Science of Thin Films 2010 pptx
Ngày tải lên :
05/03/2014, 17:20
... excess of one electron beyond the bonding octet can be promoted into the conduction band As the name implies, semiconductors lie between metals and insulators insofar as their ability to conduct ... reduces the net component of electron motion in the direction of the applied electric field On the other hand, in ionic and semiconductor solids production of more charge carriers is the result of ... atom, the electron energy levels are discrete, as shown on the right-hand side of Fig 1-8a As the atoms approach one another, the individual levels split, as a consequence of an extension of the...
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Báo cáo " Growth of CdS thin films by chemical bath deposition technique " pptx
Ngày tải lên :
14/03/2014, 13:20
... respectively The measured PL excitation spectra corresponding to the two emission bands allows to fix the excitation wavelength at ca 369 nm suitable to the CdS thin films under consideration The typical ... obtained in the bath with ml of 1M CdSO4 solution for h In this case, the slow deposition rate led to the small uniform grain size and shape and the good adhesion to the substrate On the films deposited ... all samples To vary the composition of the films, different concentrates of the CdSO4 and thiourea are used The CdS formation is detailed in the following series of chemical reactions: CdSO +...
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characterizations of porous titania thin films produced by
Ngày tải lên :
19/03/2014, 16:47
... the oxide matrix along the depth of the films The incident angle variation changes the penetration depth of X-rays which increases with the increase in the value of the incident angle The XRD patterns ... with the vacancies/defects can easily migrate within the matrix thereby leading to extrinsic electronic conductivity The electron concentration in the oxide matrix is more or less proportional to ... low concentration but the uniformity of the aluminium distribution along the depth in the TiO2 matrix cannot be ensured Nevertheless, the GAXRD results indicate that the matrix is non-stochiometric...
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improved electrochromical properties of sol–gel wo3 thin films by doping
Ngày tải lên :
20/03/2014, 13:04
... CE(λ) was 35 cm2 C− for the pure WO3 thin film which decreased to cm2 C− by increasing the gold concentration in the film to 6.4 mol% This reduction agrees with the decrease of ΔOD, as the Au concentration ... porosity [44,46] of WO3 film and addition of conducting materials to it [47] facilitate the diffusion of Li+ to the layer Thus, more penetrative ions cause stronger change in the color of the film, during ... increasing the coloring voltage, the transmittance of the colored films decreased and the rate of the coloration increased When the coloring voltage exceeds a certain value, the transmission of the...
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spin-coated thin films of sio2–wo3 composites for detection
Ngày tải lên :
20/03/2014, 13:08
... and conditions of film preparation Further studies to optimize the microstructure from these viewpoints would be necessary As mentioned above, incorporation of SiO2 in the WO3 sensing film to form ... concentrations for the films of pure WO3 and SiO2 (5%)–WO3 at 350°C are shown in Fig Rg/Ra was almost linear to the NO2 concentration and the slope of SiO2 (5%)–WO3 was almost twice as steep as that of ... considered that the saturation of the first type adsorption at a low concentration of NO2 gives rise to the inflection mentioned above It follows that these two types differ in adsorption kinetics,...
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properties and sensor performance of zinc oxide thin films
Ngày tải lên :
28/05/2014, 14:44
... investigate the effect of the Ar to O2 gas ratio on the microstructure of the undoped ZnO thin films, the oxygen concentration in the Ar/O2 mixture was varied from 10 to 90% The chamber was evacuated with ... response of ZnO films sputtered onto microarrays in response to changes in the concentrations of reducing and oxidizing gases was examined and compared to other gas sensor materials (with focus on ... magnetron sputtering using a Zn metal target with 200 °C heating of the substrate As the O2/Ar gas ratio was increased, the intensity of the peak was increased and the value of FWHM was decreased...
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Báo cáo toán học: " Structural and optical properties of ZnS thin films deposited by RF magnetron sputtering" potx
Ngày tải lên :
20/06/2014, 21:20
... FESEM images as shown in Figure The morphology of the films was found to be continuous and dense The average particle sizes varied in the range of 27.2 to 69.4 nm The crystallinity of the films improved, ... 0.384° to 0.141° as the deposition temperatures increased from 100°C to 350°C However, the FWHM value of the film prepared at 400°C increased to 0.154°, indicating the deterioration of the crystallinity ... composition evolved with the growth temperatures However, as the substrate temperature increased to 400°C, the Zn/S ratio of the films also increased to 1.04 This increase can be attributed to the...
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Báo cáo hóa học: " Direct Synthesis and Characterization of Optically Transparent Conformal Zinc Oxide Nanocrystalline Thin Films by Rapid Thermal Plasma CVD" pptx
Ngày tải lên :
20/06/2014, 22:20
... fully ionized, and condense as droplets as they leave the plasma region In addition to nanoparticle synthesis, thermal plasma CVD has also found success in ZnO thin film synthesis at a subatmospheric ... we introduce a thermal plasma CVD process using only solid zinc as the source material, thereby simplifying the design of the synthesis system We demonstrate the deposition of conformal, nanocrystalline ... the experiments; Curtis Hilger for his work on the implementation and tuning of the control system; and Mark Brunson for a portion of the data collection work Acknowledgment is made to the Donors...
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Báo cáo hóa học: " Enhanced electrochemical properties of fluoride-coated LiCoO2 thin films" pot
Ngày tải lên :
20/06/2014, 23:20
... In contrast, the rate capability and cyclic performance of the AlF3- and LaF3coated films were superior to those of the pristine film Figures 2b to 2d illustrate the voltage profiles of the pristine ... surface of the pristine LiCoO2 film from the reactive electrolyte Introduction Lithium-ion batteries are used as power sources for a wide range of applications such as cellular phones, personal ... the surface of the LiCoO2 cathode film from the acidic electrolyte attack, thus preventing the deterioration of the cathode interface This is possibly the reason for the enhancement of the rate...
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Báo cáo hóa học: " Electrospray deposition of polymer thin films for organic light-emitting diodes" pot
Ngày tải lên :
20/06/2014, 23:20
... that polymer conformation of PVK thin films was affected by the processing method as well as by the solvent's molecular structure as also indicated in PL results in Figure Based on these results, ... process, the blend ink was injected through the nozzle at a rate of 30 µl/min, and about kV was applied to break the meniscus formed at the tip of the nozzle The distance between the tip of the nozzle ... 180°C) is added to CB (ε = 5, boiling point = 130°C) [17] to balance solubility and droplet control The concentration of droplets at the time of deposition is then controlled by managing the droplet...
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Báo cáo hóa học: " Ferroelectric properties of PZT/BFO multilayer thin films prepared using the sol-gel method" ppt
Ngày tải lên :
20/06/2014, 23:20
... reduction of the leakage current induced by doping and the formation of a solid solution In these investigations, the capacitor structure formed from the metal-insulator-metal structure is used ... Figure shows the dielectric constant and dielectric loss of the PZT/BFO multilayer thin films as a function of the measuring frequency from kHz to MHz The relative dielectric constant decreased with ... measurement It should be noted that current measured in the capacitor structure includes contributions of the grain boundaries or a microstructure of the films We have already reported on the...
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báo cáo hóa học: " Structural and thermal studies of silver nanoparticles and electrical transport study of their thin films" pdf
Ngày tải lên :
21/06/2014, 02:20
... state to another where the overlapping of wave functions exists The difference in corresponding eigen energies is compensated by the absorption or emission of phonons Thus, the variation of electrical ... observed The copper and the carbon peaks correspond to the carbon coated copper grid of TEM No peaks of other impurity have been detected Therefore, the EDX profile of sample (inset of Figure ... h; the smooth, uniform, and bright silver film has been obtained on the quartz substrate due to the evaporation of the solvent (ethanol) under reduced pressure The film shows good adhesion to the...
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Báo cáo hóa học: " Thickness-dependent optimization of Er3+ light emission from silicon-rich silicon oxide thin films" pdf
Ngày tải lên :
21/06/2014, 03:20
... which is based on the shift of the TO3 peak towards that of stoichiometric SiO2 [13], the detection of Si excess is limited to the Si atoms bonded to O, and does not take into account the agglomerated ... steps of the study XP carried out the TEM experiments BG participated to the finalization of the manuscript RR drafted the manuscript, together with contributions to the analysis of the results ... profiles along almost the whole thickness demonstrates that the thickness of the material has no influence on the stoichiometry of the deposited SiO x However, the x parameter was found to increase...
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Báo cáo hóa học: "Synthesis and characterization of VO2-based thermochromic thin films for energy-efficient windows" pdf
Ngày tải lên :
21/06/2014, 04:20
... single phase VO2(M) for all the films regardless of dopant element and concentration The dopants effectively decreased the transition temperature of VO whereas the thermochromism of the films was markedly ... resistivity of the films [26] The doping of VO increased the electron density in the film, which caused the Fermi energy level shift toward the conduction band Since intrinsic VO2 thin film is of n-type, ... through two gas mass flow controllers The deposition parameters chosen to deposit the three sets of films are summarized in Table The doping of the films was done by placing a number of high-purity...
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Báo cáo hóa học: " Cohesive strength of nanocrystalline ZnO:Ga thin films deposited at room temperature" pptx
Ngày tải lên :
21/06/2014, 04:20
... (ahν)2 as a function of photon energy (hν) and extrapolating the linear region of (ahν) to energy axis where (ahν) corresponds to zero Figure 2b shows the plot of (ahν)2 as a function of photon energy ... expressed as a linear The electrical resistivity, charge carrier concentration and Hall mobility as a function of the Pw, for GZO films deposited on glass, are shown in Figure The resistivity of GZO ... (hν) for GZO films From these plots, it can be seen that the value of the bandgap of GZO decreased from 3.73 eV (0.41 Pa) to 3.48 eV (0.86 Pa), which can be understood in the context of the Burstein...
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Báo cáo hóa học: " Micro-Raman Mapping of 3C-SiC Thin Films Grown by Solid–Gas Phase Epitaxy on Si (111)" docx
Ngày tải lên :
21/06/2014, 17:20
... which the central zone was heated, was used for SiC film deposition The silicon wafer was placed on a graphite holder, with a thermocouple attached to the end The sapphire tube was connected to a ... presents the peak position of the (aSi = 5.38 A TO- SiC peak as a function of distance, x From this figure, the peak position varies from 794.5 cm-1 at the middle of the void to 793.5 cm-1 outside the ... can contribute to the observed enhancement of Raman signal: (a) multiple reflection of the incident light inside the void, (b) multiple reflection of the Raman signal in the SiC layer on top of the...
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Báo cáo hóa học: " Effect of Composition on Electrical and Optical Properties of Thin Films of Amorphous GaxSe1002x Nanorods" pptx
Ngày tải lên :
21/06/2014, 17:20
... decreases on increasing Ga concentration This may be due to the decrease in the grain size, the increase in the disorderedness of these systems This may also be due to the increase in the density of ... pre-exponential factor are calculated The estimated value of activation energy decreases on increasing Ga content in the Se system On the basis of pre-exponential factor (r0), it is suggested that the ... content as shown in Table The addition of Ga in the glass structure causes deeper band tails extended in the gap and thereby, leading to a decrease in the value of optical band gap 123 Thin Films of...
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báo cáo hóa học:" Growth behavior of titanium dioxide thin films at different precursor temperatures" pptx
Ngày tải lên :
21/06/2014, 17:20
... shows the XRD patterns of the TiO2 thin films as a function of the precursor temperature All the TiO2 thin films were deposited on the glass substrate at 400°C Sample A showed the anatase phase ... amorphous phase of the TiO2 thin films on the glass substrate at 400°C exists up to the precursor temperature of 60°C The anatase phase appears at a precursor temperature of 75°C The influence of the ... deposition, and the application to large-area deposition Also, this method is of low cost, and it is easy to control the deposition growth parameters Thus, the MOCVD method is well known as one of the...
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