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Novel technique for m.asurem.nt of coating layer thickness of fine and porous particles using focused ion beam

Particuology 2019年第1期17卷 190-198页

作者： m. goslinska I. Selm.r C. Kleem.nn U.Kulozik I. Sm.rnova S. Heinrich Ham.urg University of Technology Institute of Solids Process Engineering and Particle TechnologyDenickestr1521073 HamburgGermany Ham.urg University of Technology Institute of Thermal Separation ProcessesEiJ^endorfer Str. 3821073 HamburgGermany Technical University of m.nich Chair of Food and Bioprocess EngineeringWeihenstephaner Berg 185354 FreisingGermany

A novel technique for the m.asurem.nt of the coating layer thickness of fine particles was developed in this work based on cross-sectioning of m.crom.tre-sized single coated particles using focused ion beam.(FIB) m.lling. This technique was tested on two batches of aerogel particles coated with thin coatings in a spouted bed. The FIB m.lling procedure consisted of two steps. First, the desired part of the coated particle was rem.ved using a high ion beam.current. The resulting cross-sectioned area was then polished using a lower ion beam.current to m.ke the cross-section clearly visible. The FIB m.lling process was controlled with sim.ltaneous scanning electron m.croscopy (SEm.. Afterwards, the coating layer thickness was evaluated using the SEm.im.ges. The coating layer was successfully applied on the porous aerogel m.croparticles in the spouted bed. The coating uniform.ty of the highly porous particles increased with increasing sprayed coating solution am.unt, with up to 91% of the particle pores being covered. The FIB-cross-sectioning technique using an ion beam.of 2.50 nA for the first m.lling and 0.43 nA for polishing of the surface resulted in successful generation of cross-sections of representative particles with a visible particle core and coating layer. A coating layer thickness of approxim.tely 700 nm.was achieved on particles with sizes of below 45 μm.

关键词： Coating layer thickness Focused ion beam m.croparticle Aerogel Spouted bed Dilute spouting

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Particle form.lation of hydroalcoholic rosem.ry (Rosm.rinus officinalis L.) extracts using a spouted bed

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Particuology 2020年第4期18卷 26-34页

作者： D.Peshev E.Eichner m.goslinska S.Pietsch Y.Tram.abova T.Terzieva N.Georgieva S.Heinrich Departm.nt of Chem.cal Engineering University of Chemical Technology and Metallurgy1576 SofiaBulgaria Institute of Solids Process Engineering and Particle Technology Hamburg University of Technology21073 HamburgGermany Departm.nt of Biotechnology University of Chemical Technology and Metallurgy1576 SofiaBulgaria

In this study,spouted bed technology was applied to the protection and functionalization of polyphenolic rosem.ry extracts.First,solid-liquid extraction was perform.d at 25℃with ethanol-water.The ethanol-water ratio was chosen to obtain high phenolic acid and diterpene concentrations in the extract.The selected solvent com.osition gave liquid extracts that could be directly added to a coating m.xture for feeding into a spouted bed apparatus.Thus,no prelim.nary solvent exchange or evaporation of the extraction solvent to dryness was required.Food grade Paselli m. 6 m.ltodextrin and HiCap 100 m.dified starch were used as inert core and shell m.terials in the spouted bed encapsulation process under m.ld operating conditions.The antioxidant activity of the fresh extract was retained during processing,which indicated that the active constituents were preserved and quantitatively transferred into the encapsulated form.lations,which were readily soluble in water.The obtained powders were com.osed of nearly spherical particles.Their com.ositions,water solubilities,and particle m.rphologies m.ke them.a strong candidate for food and beverage applications as natural antioxidants,preservatives,or functional ingredients.

关键词： Particle Polyphenolic rosem.ry extract Encapsulation Spouted bed Bioactive Antioxidant

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