TY - JOUR

T1 - Sol–gel–xerogel transformations in the thin layer at the salt solution–gaseous reagent interface and the synthesis of new materials with microtubular morphology

AU - Gurenko, Vladislav

AU - Gulina, Larisa

AU - Толстой, Валерий Павлович

PY - 2019/11/1

Y1 - 2019/11/1

N2 - In this report, we consider the peculiarities of sol–gel–xerogel transformations, which occurs in the thin layer at the FeCl 2 /FeCl 3 water solution and gaseous NH 3 interface. A thin layer consisting of nanoparticles of Fe(OH) 3 and Fe 3 O 4 is formed as a result of interfacial reaction. Depending on the time of treatment with gaseous ammonia, it was possible to obtain either a freestanding layer with a thickness of 1 μm or microtubular structures (scrolls). Synthetic conditions, under which a large number of preferentially oriented microtubes are formed with diameters of about 10 and up to 200-μm long, were determined. The synthesized structures consisted of crystalline Fe 3 O 4 nanoparticles with an average diameter of about 5–10 nm incorporated in an amorphous matrix. Layers and tubes were characterized by X-ray diffraction analysis, scanning and transmission electron microscopy (SEM and TEM), and X-ray photoelectron spectroscopy. The model, concerning sol–gel–xerogel transformations in the thin layer, formed after interaction at the salt solution–gaseous reagent interface, was suggested. The magnetic properties of the products were studied. [Figure not available: see fulltext.].

AB - In this report, we consider the peculiarities of sol–gel–xerogel transformations, which occurs in the thin layer at the FeCl 2 /FeCl 3 water solution and gaseous NH 3 interface. A thin layer consisting of nanoparticles of Fe(OH) 3 and Fe 3 O 4 is formed as a result of interfacial reaction. Depending on the time of treatment with gaseous ammonia, it was possible to obtain either a freestanding layer with a thickness of 1 μm or microtubular structures (scrolls). Synthetic conditions, under which a large number of preferentially oriented microtubes are formed with diameters of about 10 and up to 200-μm long, were determined. The synthesized structures consisted of crystalline Fe 3 O 4 nanoparticles with an average diameter of about 5–10 nm incorporated in an amorphous matrix. Layers and tubes were characterized by X-ray diffraction analysis, scanning and transmission electron microscopy (SEM and TEM), and X-ray photoelectron spectroscopy. The model, concerning sol–gel–xerogel transformations in the thin layer, formed after interaction at the salt solution–gaseous reagent interface, was suggested. The magnetic properties of the products were studied. [Figure not available: see fulltext.].

KW - Interface

KW - Magnetite

KW - Microtubes

KW - Sol–gel process

KW - Thin films

KW - LAF3

KW - FE3O4 NANOPARTICLES

KW - NANOCRYSTALS

KW - FLUORIDE

KW - NANOCOMPOSITES

KW - FACILE SYNTHESIS

KW - FILMS

KW - GAS

KW - Sol-gel process

KW - TECHNOLOGY

KW - TIO2

UR - http://www.scopus.com/inward/record.url?scp=85062785709&partnerID=8YFLogxK

UR - http://www.mendeley.com/research/solgelxerogel-transformations-thin-layer-salt-solutiongaseous-reagent-interface-synthesis-new-materi

U2 - 10.1007/s10971-019-04949-w

DO - 10.1007/s10971-019-04949-w

M3 - Article

AN - SCOPUS:85062785709

VL - 92

SP - 342

EP - 348

JO - Journal of Sol-Gel Science and Technology

JF - Journal of Sol-Gel Science and Technology

SN - 0928-0707

IS - 2

ER -