2018, Volume 64(68), Issue 4 (December)
Contents
pages 1- 8 Download
Biosorbent Based on Nonliving Biomass for Textile Dye Retention from Aqueous Media
LUIZA IOANA HORCIU, "Gheorghe Asachi" Technical
University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection
ALEXANDRA CRISTINA
BLAGA, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental
Protection
CARMEN ZAHARIA, "Gheorghe Asachi" Technical
University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection
DANIELA ȘUTEU,
"Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental Protection,
dsuteu@ch.tuiasi.ro
pages 9 - 17 Download
Abstract
Due to the benefits of using microorganisms or grafting
natural materials as bio-adsorbents, the specialists’ attention has been
oriented to developing new techniques of bioremediation, as a part of the
environment biotechnologies. The article presents the results regarding the
biosorptive behavior of non-living biomass (Saccharomyces cerevisiae)
immobilized in alginate granules for removing different organic dyes (i.e.
Orange 16, Brilliant Red HE-3B, Rhodamine B, Methylene Blue) from aqueous
solution. The biosorption process has been studied in order to establish the
optimum conditions of operating process: solution pH, temperature, contact
time, initial dye concentration, and type of dye.
Keywords: aqueous
media; biosorbent; biomass; biosorption; dye.
New Materials for Bone Regeneration
MARIA SPIRIDON, "Petru Poni" Institute of Macromolecular Chemistry,
Iași, Romania,
dana_spiridon_is@yahoo.com
GRAȚIELA PIRCALABIORU, Sanimed
International Impex, București, Romania, Research Institute of University of
Bucharest, Romania
pages 19 - 25 Download
Abstract
Tissue engineering applications are being developed with the
aim to regenerate, remodel, replace or support damaged tissues and organs.
Many types of biomaterials have been studied for this purpose. The need for
development of new biomimetic materials was the answer for many researchers.
Scaffolds utilized in diverse applications of medicine, particularly, for
bone tissue engineering must include mechanical properties, integration with
host, osteoinductive (actively induce bone formation), osteoconductive
(guide and support bone regeneration) properties and material
biocompatibility. Also they can act as three-dimensional vehicles to deliver
cells.to the human body. The best selections for bone defect repair were
considered autografts (from the patient) and allografts (from the donor).
Wheter or not multiple complications and risks were connected to the use of
both types of grafts (Logeart et al., 2005), these remain the principal
options for the doctors and patients. Bone is always colonized by
osteoblasts and osteoclast cells, so it must be considered as a living
tissue.
Keywords: biomaterials; bone formation; scaffolds; tissue
engineering.
Rheological Behaviour of Some Gels Based on Gelatin
DAVID-IULIAN
LAZĂR, "Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental Protection
IULIAN AVRĂMIUC, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental
Protection
CONSTANŢA IBĂNESCU, "Gheorghe Asachi" Technical University of
Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection, "Petru Poni" Institute of Macromolecular Chemistry
of Iaşi, Romania
MARICEL DANU, "Gheorghe Asachi" Technical University of
Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection, "Petru Poni" Institute of Macromolecular Chemistry
of Iaşi, Romania, mdanu@tuiasi.ro
pages 27 - 32 Download
Abstract
Gelatin is used as
an ingredient in many foods and pharmaceuticals as a gelling and thickening
agent. The rheological properties are very important in the study of gelatin
solutions. The change in the rheological behavior of three gels with
different gelatin concentration is investigated. Adding different amount of
gelatin in the solution causes a variation of storage modulus (G'), loss
modulus (G'') and apparent viscosity when measured as a function of strain
or frequency. The results show that rheological techniques can be used to
determine gel strength.
Keywords: viscoelastic properties; structural
stability; gel strength; gelatin; rheology.
Thermal Characterization of Chocolate. The Polymorphism of Cocoa Butter
VICTORIA BEJENARI, "Gheorghe
Asachi" Technical University of Iași, Romania, "Cristofor Simionescu"
Faculty of Chemical Engineering and Environmental Protection
LAURA MIHĂILĂ,
"Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental Protection
ANDREEA-IOANA PRISACARIU, "Gheorghe Asachi" Technical University of Iași,
Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection
GEORGIANA TĂRĂBOANŢĂ, "Gheorghe Asachi" Technical
University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection
GABRIELA LISA,
"Gheorghe Asachi"
Technical University of Iași, Romania, "Cristofor Simionescu" Faculty of
Chemical Engineering and Environmental Protection,
gapreot@ch.tuiasi.ro
pages 33 - 45 Download
Abstract
The thermal behavior of seven chocolate samples from
various countries of origin, which cover all the three types of chocolate –
dark, with milk and white – was analyzed. They revealed the influence of
composition on thermal stability. Also, it was set out that the presence of
coffee in the composition leads to a different decomposition mechanism,
respectively, to an additional stage with the Tpeak of approximately 462ºC.
The differential calorimetry emphasized the butter cocoa polymorphism in the
composition of mass chocolate. It was concluded that a proper storage of
chocolate was urgently needed in order to avoid the emergence of the fat
bloom phenomenon.
Keywords: chocolate; TG; DTG; DSC; polymorphism.
Inorganic Transparent Pigments - Optical Properties
NICOLAE APOSTOLESCU,
"Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental Protection
CORINA CERNĂTESCU, "Gheorghe Asachi" Technical University of Iași, Romania,
"Cristofor Simionescu" Faculty of Chemical Engineering and Environmental
Protection
CLAUDIA COBZARU, "Gheorghe Asachi" Technical University of Iași,
Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection
RAMONA-ELENA TĂTARU-FĂRMUȘ, "Gheorghe Asachi"
Technical University of Iași, Romania, "Cristofor Simionescu" Faculty of
Chemical Engineering and Environmental Protection
MIHAELA AURELIA VIZITIU,
"Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental Protection
GABRIELA ANTOANETA APOSTOLESCU, "Gheorghe Asachi" Technical University of
Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection, ganto@ch.tuiasi.ro
pages 47 - 60 Download
Abstract
Requirements for high performance pigments and special pigments led to the
development of materials that must comply with the increasingly demanding
economic market. Manufacturers of these categories of materials work to
produce excellent durability, high colour strength, the excellent
dispensability across a wide range of binders, chemical stability and low
solubility. The paper presents the current literature information on
transparent inorganic pigments and their optical properties. Also, the main
classes of transparent inorganic pigments are presented with synthesis,
structural properties and applications.
Keywords: transparent inorganic
pigments; refractive index; iron oxides; ZnO; TiO2.
DANIEL MARECI in memoriam
by ADRIAN CĂILEAN
pages 61 - 62 Download