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Автор(ы) : Morozov E. V., Falaleev O. V., Osipova I. V., Vnukova N. G., Churilov G. N.
Заглавие : MRI study of fresh-selected liver surface subject to plasma treatment
Коллективы : "Nuclear Magnetic Resonance in Condensed Matter", International symposium and summer school, Санкт-Петербургский государственный университет
Место публикации : Nuclear magnetic resonance in condensed matter: Intern. symp. a. summer school in Saint Petersburg, 5th meet. "NMR in heterogeneous systems", 4-5 July 2008 : book of abstracts. - 2008. - С. 261
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Morozov E. V., Shabanova O. V., Falaleev O. V.
Заглавие : MRI Comparative Study of Container Geometry Impact on the PMMA Spheres Sedimentation
Место публикации : Appl. Magn. Reson. - 2013. - Vol. 44, Is. 5. - P.619-636. - ISSN 0937-9347, DOI 10.1007/s00723-012-0432-8
Примечания : Cited References: 31
Предметные рубрики: OPAL PHOTONIC CRYSTALS
SUSPENSIONS
PARTICLES
VELOCITY
Аннотация: Nuclear magnetic resonance (NMR) imaging results are presented for the comparative study of sedimentation of the polymethylmethacrylate colloidal suspensions with spherical particle diameters of 475, 350 and 255 nm. The time evolution of the particle volume fraction in the sedimenting system, velocity of the fluid/suspension interface, interface broadening, and sediment growth velocity are measured against the system concentration as well as the container geometry. Using the experimental data the hindered settling function is evaluated. The influence of the container geometry on the parameters defining the hindered settling function in different approaches is evaluated for the first time. The limiting value of the particle diameter is estimated at which the container geometry has no impact any longer. This effect can be explained by the microscale structure persisting at low Peclet numbers. In addition, the influence of the container geometry on interface broadening and sediment formation for different particle diameters and volume fractions is studied. Spontaneous sediment packing induced by a modified container geometry has been found. NMR imaging has proven to be a highly efficient research tool for studying sedimentation at low Peclet numbers.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Morozov E. V.
Заглавие : MRI defectoscopy of polymer composites and materials
Коллективы : "Euromar", International Conference
Место публикации : Euromar. Denmark 2016: book of abstracts. - 2016. - Ст.M14
Примечания : References: 5. - The work is supported by Russian Foundation for Basic Research (project #14-29-10178 ofi_m).
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Morozov E. V., Novikov M. M., Bouznik V. M.
Заглавие : MRI monitoring and non-destructive quality measurement of polymeric patterns manufactured via stereolithography
Место публикации : Addit. Manuf.: Elsevier, 2016. - Vol. 12. - P.16-24. - ISSN 22148604 (ISSN), DOI 10.1016/j.addma.2016.05.015
Ключевые слова (''Своб.индексиров.''): aging--build parameters--mri--polymers--stereolithography
Аннотация: The use of Magnetic Resonance Imaging (MRI) for monitoring, studying and performing output quality measurements of the acrylate-based polymeric patterns manufactured using stereolithography (SL) was introduced in this work. The effects of build parameters and humid environment on sample homogeneity, distribution of crosslink density, stability and defect formation were examined. The spatial resolution of the method was found to be sufficient to identify patterns according to the build parameters used and to detect specific hatch-predicted crosslink density variations. Qualitative information obtained using MRI visualisation was supplemented by quantitative measurements of Nuclear Magnetic Resonance (NMR) relaxation times and 1H NMR spectra. NMR spectroscopy confirmed the identity of the chemical composition among the patterns and showed that the crosslink density variation observed via spatially resolved T2-profiles stems from the difference of the build parameters. Different types of defects in the samples were observed and classified; some defects originated from local matrix continuity failures (partially cured resin trapping within the polymer or bubbles formation), while other defects were found in the form of bulk layering. MRI visualisation coupled with relaxometry and 1H spectroscopy of patterns during their interaction with humidity allowed tracking water distribution inside the sample and observing effects of swelling, fracturing and chemical decomposition. It was found that the initial inhomogeneous structure of the specimen has a crucial role in subsequent fracturing due to non-uniform expansion of the swollen parts. As a result, the approach presented in this work improves the output quality control and current testing techniques, provides insight how physical properties of the 3D parts are affected by different technical parameters, and eventually can help the use of SL technologies for a variety of applications. © 2016 Elsevier B.V.
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