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71.
72.
Christine M. Papadakis Kristoffer Almdal Kell Mortensen Frank Rittig Petr tpnek 《Macromolecular Symposia》2000,162(1):275-290
We report on polarized and depolarized dynamic light scattering (DLS) measurements on two asymmetric poly(ethylene‐alt‐propylene‐block‐dimethylsiloxane) (PEP‐PDMS) diblock copolymers in bulk. Apart from the disordered phase, the samples form various ordered morphologies below their respective order‐to‐disorder transition temperatures: One of the samples forms the hexagonal structure composed of PEP cylinders in a PDMS matrix, whereas the other one forms three ordered structures as a function of temperature, among them two cubic micellar structures and a non‐cubic structure. We report here on the dynamic processes found in polarized DLS measurements in the disordered, hexagonal, cubic micellar and non‐cubic structure in the same material. 相似文献
73.
I. Papadakis Christophe R. Quétel Philip D. P. Taylor Paul De Bièvre 《Accreditation and quality assurance》2000,5(5):198-204
Metrological certification through a primary method of measurement and how it can be achieved is demonstrated in this paper,
using the example of re-certification of cadmium and lead content in a biological material, the Bureau Communataire de Reference,
reference material CRM-278R mussel tissue. The measurement method used was isotope dilution in combination with inductively
coupled plasma mass spectrometry. Microwave digestion was applied to the samples prior to the measurements. A detailed uncertainty
budget was evaluated according to the International Organisation of Standardisation, Guide to the Expression of Uncertainty
and EURACHEM Guide, resulting in an expanded uncertainty.
Received: 20 August 1999 / Accepted: 3 January 2000 相似文献
74.
A. S. Merenga C. M. Papadakis F. Kremer J. Liu A. F. Yee 《Colloid and polymer science》2001,279(11):1064-1072
Broadband dielectric spectroscopy (1–106 Hz, 183–423 K) and differential scanning calorimetry are employed to analyze the inter- and intramolecular dynamics of a
series of random copolymers based on poly(ethylene terephthalate) and poly(1,4-cyclohexylene dimethylene terephthalate). In
addition to an interfacial relaxation (α*-process), three dielectric relaxation processes are observed: The α-relaxation (“dynamic
glass transition”) and two secondary relaxations (β- and β*-relaxations). The α-relaxation depends sensitively on the composition
of the copolymer and shows a rapid slowing down with increasing content of cyclohexylene dimethylene (CHDM) linkages. Besides
the β-relaxation, attributed to local motion of the ester group, an additional process (β*-relaxation) is observed on introducing
the CHDM linkages. Increasing the content of the latter reduces the strength of the β-relaxation strongly and increases its
activation energy by more than 30%. This proves that owing to interactions between the cylohexylene rings and the ester group
the β-relaxation no longer has local character only.
Received: 28 September 2000 Accepted: 29 January 2001 相似文献
75.
Stavros Argyrios Papadakis 《代数通讯》2013,41(1):313-321
In this note we deal with rational curves in ? 3 which are images of a line by means of a finite sequence of cubo-cubic Cremona transformations. We prove that these curves can always be obtained applying to the line a sequence of such transformations increasing at each step the degree of the curve. As a corollary we get a result about curves that can give speciality for linear systems of ? 3. 相似文献
76.
Raffaello Papadakis Ioanna Deligkiozi Athanase Tsolomitis 《Analytical and bioanalytical chemistry》2010,397(6):2253-2259
This work deals with the design, synthesis, and characterization of a new solvatochromic dye. The intense solvatochromic behavior
of this new synthesized non symmetric viologen was investigated using UV–Vis spectrophotometry. A further purpose was the
study of the interactions between the solvent and solute molecules responsible for the solvatochromism. Several protic and
aprotic solvents were used, and the resulting absorption maxima wavenumbers obtained via UV–Vis spectrophotometry, were correlated
with the solvent polarity parameters, E
T
(30) (Dimroth–Reichardt solvent polarity parameter) and the Gutmann’s donor number (DN) using the biparametric model introduced
by Krygowski and Fawcett. The analysis of the relative contribution of each parameter has clearly shown that the dominating
interaction responsible for the solvatochromic behavior observed is the proton donation by the solute molecules to the solvent
molecules, the latter acting as a Lewis bases. This is an interaction which can be described by DN. Additionally, the good
correlation with the Kamlet–Taft parameter β is in good agreement. 相似文献
77.
78.
Philippos Papadakis Iain Moore Ilkka Pohjalainen Jan Sarén Juha Uusitalo 《Hyperfine Interactions》2016,237(1):152
A low-energy radioactive ion beam facility for the production and study of nuclei produced close to the proton drip line is under development at the Accelerator Laboratory of the University of Jyväskylä, Finland. The facility will take advantage of the mass selectivity of the recently commissioned MARA vacuum-mode mass separator. The ions selected by MARA will be stopped and thermalised in a small-volume gas cell prior to extraction and further mass separation. The gas cell design allows for resonance laser ionisation/spectroscopy both in-gas-cell and in-gas-jet. The facility will include experimental setups allowing ion counting, mass measurement and decay spectroscopy. 相似文献
79.
Qi Zhong Weinan Wang Joseph Adelsberger Anastasia Golosova Achille M. Bivigou Koumba Andre Laschewsky Sergio S. Funari Jan Perlich Stephan V. Roth Christine M. Papadakis Peter M��ller-Buschbaum 《Colloid and polymer science》2011,289(5-6):569-581
The thermal behavior of poly(methoxydiethylenglycol acrylate) (PMDEGA) is studied in thin hydrogel films on solid supports and is compared with the behavior in aqueous solution. The PMDEGA hydrogel film thickness is varied from 2 to 422?nm. Initially, these films are homogenous, as measured with optical microscopy, atomic force microscopy, X-ray reflectivity, and grazing-incidence small-angle X-ray scattering (GISAXS). However, they tend to de-wet when stored under ambient conditions. Along the surface normal, no long-ranged correlations between substrate and film surface are detected with GISAXS, due to the high mobility of the polymer at room temperature. The swelling of the hydrogel films as a function of the water vapor pressure and the temperature are probed for saturated water vapor pressures between 2,380 and 3,170?Pa. While the swelling capability is found to increase with water vapor pressure, swelling in dependence on the temperature revealed a collapse phase transition of a lower critical solution temperature type. The transition temperature decreases from 40.6?°C to 36.6?°C with increasing film thickness, but is independent of the thickness for very thin films below a thickness of 40?nm. The observed transition temperature range compares well with the cloud points observed in dilute (0.1?wt.%) and semi-dilute (5?wt.%) solution which decrease from 45?°C to 39?°C with increasing concentration. 相似文献
80.
In this work, a new [2]rotaxane consisted of a diazobenzene containing π-conjugated linear compartment, including the 4,4′-bipyridyl moiety and α-cyclodextrin (α-CD) as the macrocyclic compartment, was synthesised with yields of nearly 57% and fully characterised. α-CD easily assembled with the linear compartment and suitable bulky ends (stoppers) in water to give a new [2]rotaxane. The characterisation of this supramolecular compound was accomplished using several spectroscopic techniques such as 1H NMR, 13C NMR and 2D NMR spectroscopy, powder X-ray diffraction, fourier transform infrared spectroscopy, induced circular dichroism and UV–vis spectrophotometry, as well as scanning electron microscopy and Energy Dispersive X-ray. Furthermore, the reversible E–Z photoisomerisation of both [2]rotaxane and its molecular dumbbell was investigated by irradiation with UV light. 相似文献