Letno poročilo 2005

Cement:
V sklopu raziskav za SALONIT Anhovo smo
zaklju~ili raziskave vplivov razli~no topnih
karbonatov na hidratacijo ter nastanek
hidratiziranih faz v portland cementu. Topnostni
parametri karbonatov vplivajo na nastanek
specifi~nih faz, ~as hidratacije pa na kon~no
fazno sestavo hidratiziranega cementa.
Sintetizirali smo ~ist tetrakalcijev monokarboaluminat
11-hidrat, ki se pojavlja v
hidratiziranih cementih z apnencem, in ga
okarakterizirali s termi~no analizo, pra{kovno
rentgensko difrakcijo ter FTIR spektroskopijo.
Strukturna analiza drugih materialov:
Z jedrsko magnetno resonanco smo prou~evali
tudi z biolo{kega stali{~a zelo zanimive myoinositol
heksafosfatne spojine. Te spojine igrajo
pomembno vlogo v prehrani, pri zdravju in tudi
na podro~ju konzervatorstva. Posebej zanimivo
je delovanje fitatne kisline kot antioksidanta, ki
z veliko afiniteto ve`e nase `elezo. S spektroskopijo
fosforjevih jeder smo dobili vpogled v
tvorbo vezi med atomi `eleza, kisika in fosforja
in v lokalno strukturo v amorfnih paramagnetnih
`elezovih fitatih.
Jedrsko magnetno resonanco smo uporabljali
tudi za {tudij ionskih teko~in in karakterizacijo
trdnih farmacevtskih vzorcev industrijskih
partnerjev.
Vzporedno smo ves ~as razvijali NMR metode
za {tudij strukture anorganskih materialov.
SODELOVANJE Z INDUSTRIJSKIMI
IN DRUGIMI PARTNERJI
- Salonit Anhovo d.d., Deskle: raziskave in
razvoj cementov z apnencem in mineralnimi
dodatki
- Lek d.d., Ljubljana: rentgenska pra{kovna
analiza in dolo~anje specifi~ne povr{ine
- Krka d.d., Novo mesto: rentgenska pra{kovna
analiza in dolo~anje specifi~ne povr{ine
MEDNARODNO SODELOVANJE
- [esti okvirni program Evropske unije, NoE FP6
INSIDE PORES (2004 - 2008), koordinator:
Laboratorij za anorgansko kemijo in tehnologijo
Laboratory for Inorganic Chemistry and Technology
sition in portland cement. Carbonate solubility
parameters were shown to influence the
formation of hydrated phases to various extents
and hydration time dependencies were
assessed.
Tetracalcium monocarboaluminate 11-hydrate,
the compound that appears in hydrated
limestone–containing portland cement, was
synthesised and characterised by thermal
analysis, X-ray powder diffraction and FTIR
spectroscopy.
Structural analysis of other materials:
Application of broadline phosphorus NMR
spectroscopy was extended to biologically relevant
myo-inositol hexaphosphate (phytate)
compounds. These compounds play an important
role in nutrition, health and conservation
sciences. Especially remarkable is an
antioxidant property of the phytic acid, which
derives from the high binding affinity of this
acid for iron. Broadline phosphorus NMR provided
insight into formation of bonds between
phosphorus, oxygen, and iron atoms and offered
a picture of a short-range structure
within amorphous paramagnetic ironphytates.
Several solid-state NMR measurements were
performed also on samples of ionic liquids and
on pharmaceutical samples from industrial
partners.
In parallel, the methodology for structural
description of inorganic materials was being
developed.
COLLABORATION WITH INDUSTRIAL AND
OTHER PARTNERS
- Salonit Anhovo d.d., Deskle, Slovenia; Investigations
and development of cements
with limestone and mineral additives
- Lek d.d., Ljubljana, Slovenia: X-ray powder
diffraction analyses and determination of
specific surface areas
- Krka d.d., Novo mesto, Slovenia: X-ray powder
diffraction analyses and determination
of specific surface areas
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