SwePub - sökning: WFRF:(Niklasson GA)

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1.	ANDERSSON, SK, et al. (författare) INFLUENCE OF SURFACE-ROUGHNESS ON THE INFRARED RESTSTRAHLEN BAND 1995 Ingår i: JOURNAL OF PHYSICS-CONDENSED MATTER. - : IOP PUBLISHING LTD. - 0953-8984. ; 7:36, s. 7173-7184 Tidskriftsartikel (refereegranskat)abstract We study the influence of surface roughness on the infrared reststrahlen band in insulating materials. We model the surface features with either truncated spherical bumps on, or truncated spherical pits in, the substrate. The polarizability of the truncat
2.	Hedenus, P, et al. (författare) Characterisation of instantaneous water absorption properties of pharmaceutical excipients 2000 Ingår i: INTERNATIONAL JOURNAL OF PHARMACEUTICS. - 0378-5173. ; 202:1-2, s. 141-149 Tidskriftsartikel (refereegranskat)abstract Powders absorb water by both capillary imbibition and swelling. The capillary process is almost instantaneous but swelling occurs over. a period of time. An isothermal transient ionic current technique was used in this study to characterise the instantane
3.	Hultaker, A, et al. (författare) Electrical and optical properties of sputter deposited tin doped indium oxide thin films with silver additive 2001 Ingår i: THIN SOLID FILMS. - : ELSEVIER SCIENCE SA. - 0040-6090. ; 392:2, s. 305-310 Tidskriftsartikel (refereegranskat)abstract Tin doped indium oxide (ITO) films with a few mol% of silver were prepared by reactive DC magnetron sputtering. The purpose of adding silver is to boost conductivity. The real part of the refractive index of ITO was determined from ellipsometry data, appl
4.	Jonsson, AK, et al. (författare) Li intercalation in zirconium dioxide films 2000 Ingår i: DEFECTS AND DIFFUSION IN CERAMICS: AN ANNUAL RETROSPECTIVE II. - : SCITEC PUBLICATIONS LTD. ; 177-1, s. 51-58 Recension (övrigt vetenskapligt/konstnärligt)abstract Electronic and Li ionic conduction in sputtered transparent ZrO2 thin films intercalated with Li ions, have been studied using impedance spectroscopy, isothermal transient ionic current and galvanostatic intermittent titration measurements. The ZrO2 was f
5.	Karmhag, R, et al. (författare) Oxidation kinetics of nickel nanoparticles 2001 Ingår i: JOURNAL OF APPLIED PHYSICS. - : AMER INST PHYSICS. - 0021-8979. ; 89:5, s. 3012-3017 Tidskriftsartikel (refereegranskat)abstract The oxidation kinetics of nickel particles with an approximate median size of 15 nm was determined by thermogravimetry. The particles had a thin initial oxide shell amounting to 36 wt % of the sample. The kinetics was studied in pure oxygen in the tempera
6.	Karmhag, R, et al. (författare) Oxidation kinetics of nickel solar absorber nanoparticles 2001 Ingår i: JOURNAL OF PHYSICS D-APPLIED PHYSICS. - : IOP PUBLISHING LTD. - 0022-3727. ; 34:3, s. 400-406 Tidskriftsartikel (refereegranskat)abstract The alumina matrix of an electrolytically deposited solar absorber coating was etched away leaving nickel nanorods standing on an aluminium support. The oxidation kinetics of the nickel nanorods, with an approximate diameter of 30 nm and a height of appro
7.	Kish, LB, et al. (författare) New approach to the origin of lognormal size distributions of nanoparticles 1999 Ingår i: NANOTECHNOLOGY. - : IOP PUBLISHING LTD. - 0957-4484. ; 10:1, s. 25-28 Tidskriftsartikel (refereegranskat)abstract A new model for particle growth can predict the well known lognormal particle size distribution from first principles in a physically realistic way. The model is completely different from the usually applied coagulation models; it is based on a reside
8.	Kish, LB, et al. (författare) The real origin of lognormal size distributions of nanoparticles in vapor growth processes 1999 Ingår i: NANOSTRUCTURED MATERIALS. - : PERGAMON-ELSEVIER SCIENCE LTD. - 0965-9773. ; 12:1-4, s. 327-332 Tidskriftsartikel (refereegranskat)abstract In modern nanoparticle production methods, such as inert-gas evaporation, a strong effort is made to avoid coagulation of particles. Therefore, the classical coagulation models are not suitable for predicting the particle size distribution. This paper
9.	Lindstrom, T, et al. (författare) Surface roughness in sputtered SnO2 films studied by atomic force microscopy and spectroscopic light scattering 2000 Ingår i: JOURNAL OF APPLIED PHYSICS. - : AMER INST PHYSICS. - 0021-8979. ; 87:9, s. 4562-4571 Tidskriftsartikel (refereegranskat)abstract In this paper we study the growth of surface roughness during sputtering of transparent SnO2 films onto rough glass substrates. Films in the thickness range 50-1200 nm were produced, and the optical characterization was made with a spectroscopic total int
10.	Luo, X, et al. (författare) Transparent ion-conducting ceria-zirconia films made by sol-gel technology 1998 Ingår i: SOLAR ENERGY MATERIALS AND SOLAR CELLS. - : ELSEVIER SCIENCE BV. - 0927-0248. ; 53:3-4, s. 341-347 Tidskriftsartikel (refereegranskat)abstract Films of Ce-Zr oxide were made by sol-gel deposition according to three different routes. Cyclic voltammetry showed that Li+ intercalation/deintercalation took place if the Ce content was sufficient. The films had a high transmittance for visible ligh
11.	Mattsson, MS, et al. (författare) A new method of characterising liquid uptake within particles over short time periods 2000 Ingår i: INTERNATIONAL JOURNAL OF PHARMACEUTICS. - 0378-5173. ; 199:2, s. 179-185 Tidskriftsartikel (refereegranskat)abstract A method of measuring both the capacity and rate of absorption of liquid by powders of small particles over short time periods (of the order of a few seconds or less) is presented. The method is based on the measurement of the isothermal transient ionic c
12.	NETTELBLAD, B, et al. (författare) APPROXIMATE DETERMINATION OF SURFACE CONDUCTIVITY IN POROUS-MEDIA 1995 Ingår i: JOURNAL OF PHYSICS D-APPLIED PHYSICS. - : IOP PUBLISHING LTD. - 0022-3727. ; 28:10, s. 2037-2045 Tidskriftsartikel (refereegranskat)abstract We have studied the fluid permeability and the electrical conduction in artificially made impregnated sandstones in order to determine the surface conductivity approximately. The electrical conductivity of the impregnated porous medium is not proportional
13.	Nettelblad, B, et al. (författare) Conductivity of random sphere packings: Effects of a size distribution 1996 Ingår i: PHYSICAL REVIEW E. - : AMER INST PHYSICS. - 1063-651X. ; 53:4, s. 3864-3866 Tidskriftsartikel (refereegranskat)abstract Experimental results for the formation factor of packings of spheres with two well defined sizes, in a conducting fluid, are compared with an equation of Berryman [Phys. Rev. B 27, 7789 (1983)]. When Berryman's formula is used twice, in a repeated-mixing
14.	Nettelblad, B, et al. (författare) Dielectric relaxations in liquid-impregnated porous solids 1997 Ingår i: JOURNAL OF MATERIALS SCIENCE. - : CHAPMAN HALL LTD. - 0022-2461. ; 32:14, s. 3783-3800 Tidskriftsartikel (refereegranskat)abstract We have studied dielectric relaxation in liquid-impregnated porous solids. The samples were constructed from either glued sand grains or sintered polypropylene beads. We experimentally obtain two relaxations originating from the bulk of the sample. Electr
15.	Nettelblad, B, et al. (författare) Effects of microgeometry on the permittivity of impregnated porous media 1996 Ingår i: JOURNAL OF PHYSICS-CONDENSED MATTER. - : IOP PUBLISHING LTD. - 0953-8984. ; 8:38, s. 7049-7058 Tidskriftsartikel (refereegranskat)abstract We propose a new approximative relation for the low-frequency dielectric permittivity of liquid-filled porous materials. In this formulation, effects of microgeometry are included through the so-called Lambda parameter. Our measurements on salt-water-impr
16.	Nettelblad, B, et al. (författare) Simple expressions for the dielectric response of suspensions in an electrolyte 1996 Ingår i: JOURNAL OF COLLOID AND INTERFACE SCIENCE. - : ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS. - 0021-9797. ; 181:1, s. 165-168 Tidskriftsartikel (refereegranskat)abstract We have compared various theories for the dielectric response of suspensions of solid spheres in an electrolyte, due to electrochemical double-layer effects. We find that all theories have close to the same frequency dependence, which can be described by
17.	Nettelblad, B, et al. (författare) The dielectric dispersion of liquid-filled porous sintered materials 1996 Ingår i: JOURNAL OF PHYSICS-CONDENSED MATTER. - : IOP PUBLISHING LTD. - 0953-8984. ; 8:16, s. 2781-2790 Tidskriftsartikel (refereegranskat)abstract We have used a differential effective-medium (DEM) theory to model the dielectric properties of sintered glass beads, impregnated with salty water, in the kHz and MHz ranges. The starting point of the theory is a lattice of touching spheres in pore liquid
18.	NETTELBLAD, B, et al. (författare) THE EFFECTS OF SALINITY ON LOW-FREQUENCY DIELECTRIC-DISPERSION IN LIQUID-IMPREGNATED POROUS SOLIDS 1995 Ingår i: JOURNAL OF PHYSICS-CONDENSED MATTER. - : IOP PUBLISHING LTD. - 0953-8984. ; 7:45, s. L619-L624 Tidskriftsartikel (refereegranskat)abstract In this letter we study the dielectric properties of brine-impregnated artificial sandstones. The frequency-dependent dielectric permittivity shows a relaxation due to the electrochemical double layer at the interfaces. Good agreement was obtained with a
19.	Niklasson, GA, et al. (författare) Polaron absorption in tungsten oxide nanoparticle aggregates 2001 Ingår i: ELECTROCHIMICA ACTA. - : PERGAMON-ELSEVIER SCIENCE LTD. - 0013-4686. ; 46:13-14, s. 1967-1971 Tidskriftsartikel (refereegranskat)abstract Small tungsten oxide nanoparticles were prepared from a heated tungsten filament, by gas evaporation in air at pressures between 1 and 9 Torr. Transmission electron microscopy showed that the median particle diameter increased with pressure during evapora
20.	Niklasson, GA, et al. (författare) Surface roughness of pyrolytic tin dioxide films evaluated by different methods 2000 Ingår i: THIN SOLID FILMS. - : ELSEVIER SCIENCE SA. - 0040-6090. ; 359:2, s. 203-209 Tidskriftsartikel (refereegranskat)abstract The scaling of surface roughness in thin spray pyrolyzed fluorinated tin dioxide films of different thicknesses was obtained from atomic force microscopy. The data show that, within experimental uncertainties, the effective dimensionality of the surface i
21.	Otiti, T, et al. (författare) Anisotropic optical, magnetic, and electrical properties of obliquely evaporated Ni films 1997 Ingår i: THIN SOLID FILMS. - : ELSEVIER SCIENCE SA. - 0040-6090. ; 307:1-2, s. 245-249 Tidskriftsartikel (refereegranskat)abstract Obliquely evaporated Ni films were studied by spectrophotometry, SQUID magnetometry, and de electrical measurements. The results could be qualitatively understood from the presence of an inclined columnar microstructure with shape anisotropy governin
22.	Pustovit, VN, et al. (författare) Observability of resonance optical structure in fractal metallic clusters 2001 Ingår i: JOURNAL OF APPLIED PHYSICS. - : AMER INST PHYSICS. - 0021-8979. ; 90:3, s. 1275-1279 Language: English Tidskriftsartikel (refereegranskat)abstract We investigate optical properties of the deterministic network model for fractal metallic clusters at the percolation threshold. As input data we used the experimental bulk dielectric function of gold, aluminum, and nickel. Sharp absorption resonances in
23.	Rodriguez, J, et al. (författare) Sputter-deposited Ti oxide films used for photoelectrocatalytic degradation of 4-chlorophenol 2001 Ingår i: JOURNAL OF MATERIALS SCIENCE. - : KLUWER ACADEMIC PUBL. - 0022-2461. ; 36:15, s. 3699-3705 Language: English Tidskriftsartikel (refereegranskat)abstract Ti oxide films were made by reactive magnetron sputtering under conditions yielding "penniform" structures with large porosity. X-ray diffractometry showed that rutile-like and anatase-like films were produced depending on the oxygen content in the sputte
24.	Soderlund, J, et al. (författare) Lognormal size distributions in particle growth processes without coagulation 1998 Ingår i: PHYSICAL REVIEW LETTERS. - : AMERICAN PHYSICAL SOC. - 0031-9007. ; 80:11, s. 2386-2388 Tidskriftsartikel (refereegranskat)abstract A new model is proposed to explain lognormal particle size distributions found in vapor growth processes such as gas evaporation, without invoking coagulation. In the model, particles are moving by diffusion and drift through a finite growth region. T
25.	Sotelo, JA, et al. (författare) Optical properties of quasifractal metal nanoparticle aggregates 1999 Ingår i: NANOSTRUCTURED MATERIALS. - : PERGAMON-ELSEVIER SCIENCE LTD. - 0965-9773. ; 12:1-4, s. 135-138 Tidskriftsartikel (refereegranskat)abstract We calculate the optical extinction efficiency of two-dimensional small quasifractal aggregates consisting of metal nanoparticles. Computations were carried out in the octupolar approximation for aggregates of 25 particles. Calculations for gold particles
26.	Tesfamichael, T, et al. (författare) A feasibility study of integrally colored Al-Si as a solar selective absorber 1998 Ingår i: SOLAR ENERGY MATERIALS AND SOLAR CELLS. - : ELSEVIER SCIENCE BV. - 0927-0248. ; 55:3, s. 251-265 Tidskriftsartikel (refereegranskat)abstract The solar selective properties of integrally colored Al-Si alloy (11.6 wt% Si) have been investigated. Optical measurements showed a continuous decrease of reflectance, i.e. an increase of absorptance, with increasing film thickness. A maximum solar absor
27.	Tesfamichael, T, et al. (författare) Optical characterization and modeling of black pigments used in thickness-sensitive solar-selective absorbing paints 2000 Ingår i: SOLAR ENERGY. - : PERGAMON-ELSEVIER SCIENCE LTD. - 0038-092X. ; 69:1-6, s. 35-43 Tidskriftsartikel (refereegranskat)abstract The performance of black pigments used in thickness-sensitive solar-selective absorbing paints for solar thermal collectors depends on the optical properties of the pigments. Knowledge of the intrinsic optical properties of most paint pigments is very lim
28.	Tesfamichael, T, et al. (författare) Optical characterization method for black pigments applied to solar-selective absorbing paints 2001 Ingår i: APPLIED OPTICS. - : OPTICAL SOC AMER. - 0003-6935. ; 40:10, s. 1672-1681 Language: English Tidskriftsartikel (refereegranskat)abstract We propose a novel, to our knowledge, method for characterizing the optical properties of pigment particles or powders, Measurements of the diffuse and the total transmittance as well as the diffuse and the total reflectance are used to obtain effective s
29.	Tesfamichael, T, et al. (författare) Optical properties of silicon pigmented alumina films 1997 Ingår i: JOURNAL OF APPLIED PHYSICS. - : AMER INST PHYSICS. - 0021-8979. ; 82:7, s. 3508-3513 Tidskriftsartikel (refereegranskat)abstract Plates of Al-Si alloy were anodized in a sulfuric acid solution. This treatment provides a Si-Al2O3 coating growing at a rate of 0.14 mu m/min. The Si particles had sizes between 1 and 10 mu m, as seen by scanning electron microscopy. Optical measurements
30.	Vargas, WE, et al. (författare) Applicability conditions of the Kubelka-Munk theory 1997 Ingår i: APPLIED OPTICS. - : OPTICAL SOC AMER. - 0003-6935. ; 36:22, s. 5580-5586 Tidskriftsartikel (refereegranskat)abstract The description of optical properties of light-scattering materials has made extensive use of radiative transfer models. One of the most successful and simplest models is that of Kubelka and Munk (KM). With this model, optical properties of particulate fi
31.	Vargas, WE, et al. (författare) Forward-scattering ratios and average pathlength parameter in radiative transfer models 1997 Ingår i: JOURNAL OF PHYSICS-CONDENSED MATTER. - : IOP PUBLISHING LTD. - 0953-8984. ; 9:42, s. 9083-9096 Tidskriftsartikel (refereegranskat)abstract Optical properties of films containing spherical particles in a non-absorbing matrix have been modelled by a four-flux radiative transfer theory. In this paper we demonstrate methods to calculate all parameters in this model. Scattering and absorption coe
32.	Vargas, WE, et al. (författare) Generalized method for evaluating scattering parameters used in radiative transfer models 1997 Ingår i: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION. - : OPTICAL SOC AMER. - 0740-3232. ; 14:9, s. 2243-2252 Tidskriftsartikel (refereegranskat)abstract The effective scattering and absorption coefficients used to describe the optical properties of particulate materials in radiative transfer models are determined by the average path-length parameter of the diffuse radiation, as well as by the fraction of
33.	Vargas, WE, et al. (författare) Intensity of diffuse radiation in particulate media 1997 Ingår i: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION. - : OPTICAL SOC AMER. - 0740-3232. ; 14:9, s. 2253-2262 Tidskriftsartikel (refereegranskat)abstract A method for calculating the angular and optical depth dependencies of diffuse radiation in light scattering and absorbing particulate media is established. From the Lorenz-Mie theory, the coefficients involved in the expansion of the single particle phas
34.	Vargas, WE, et al. (författare) Light scattering in pigmented coatings: Experiments and theory 2000 Ingår i: SOLAR ENERGY. - : PERGAMON-ELSEVIER SCIENCE LTD. - 0038-092X. ; 68:6, s. 553-561 Tidskriftsartikel (refereegranskat)abstract Small silica particles uniformly coated by a shell of titania, were produced by wet chemical methods. The pigments were dispersed in polymeric hinders and were applied as paints to glass substrates. Total reflectance and transmittance were determined by i
35.	Vargas, WE, et al. (författare) Optical properties of nano-structured dye-sensitized solar cells 2001 Ingår i: SOLAR ENERGY MATERIALS AND SOLAR CELLS. - : ELSEVIER SCIENCE BV. - 0927-0248. ; 69:2, s. 147-163 Tidskriftsartikel (refereegranskat)abstract Radiative transfer computations are carried out to describe the intrinsic and effective optical properties of light diffusing and absorbing materials consisting of anatase titania pigments hosted in an electrolyte medium. The intrinsic visible absorption
36.	Vargas, WE, et al. (författare) Pigment mass density and refractive index determination from optical measurements 1997 Ingår i: JOURNAL OF PHYSICS-CONDENSED MATTER. - : IOP PUBLISHING LTD. - 0953-8984. ; 9:7, s. 1661-1670 Tidskriftsartikel (refereegranskat)abstract The reflectance and transmittance of polymer films containing colloidal particles are characterized by specular and diffuse components which, for a given wavelength of the incident radiation, depend on particle size and composition, particle concentration
37.	Vargas, WE, et al. (författare) Reflectance of pigmented polymer coatings: comparisons between measurements and radiative transfer calculations 2001 Ingår i: APPLIED OPTICS. - : OPTICAL SOC AMER. - 0003-6935. ; 40:1, s. 85-94 Tidskriftsartikel (refereegranskat)abstract Solar reflectance spectra of pigmented coatings have been obtained from spectroscopic measurements involving integrating sphere attachments. We demonstrate that measured and computed reflectances of an extended four-flux model [Appl. Opt. 37, 2615 (1998)]

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