Materials Literature
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Nanoporous carbon with narrow pore size distribution was prepared via a nanocasting technique by direct carbonization of cyclodextrin-silica organic-inorganic hybrid composite. The obtained carbon exhibited very high BET surface area and high pore volume.
The influence of sulfonation degree (n) and central atom nature on singlet oxygen quantum yield (Φ Δ ) were studied for a series of sulfonated phthalocyanine metal complexes MPcS n mix . It was found that in DMSO, where the studied dyes exist as monomers, Φ Δ values are independent of number and position of the sulfog…
The stress–strain behavior of two single crystalline Ni–Mn–Ga alloys with martensitic transformation temperatures above the Curie temperature has been studied during uniaxial compression along the [001] and [110] axes. The superelastic effect associated to the reversible stress-induced martensitic transformation has b…
Sensory and instrumental fabric characteristics that contribute to military clothing comfort are analyzed in a series of studies. A standardized hand evaluation methodology is checked for its sensitivity and reliability and used to characterize thirteen military fabrics. A labeled magnitude scale of comfort is develop…
Abstract Flame retardant Nylon 6 (PA6)/montmorillonite (MMT) nanocomposites have been prepared using direct melt intercalation technique by blending PA6, organophilic clay and conventional fire retardants, such as the melamine cyanurate (MCA) and the combination of decabromodiphenyl oxide (DB) and antimony oxide (AO).…
The complex [Mn(12)O(12)(O(2)CCHCl(2))(16)(H(2)O)(4)] (2) in MeCN exhibits three quasi-reversible one-electron reduction processes at significantly higher potentials than [Mn(12)O(12)(O(2)CMe)(16)(H(2)O)(4)] (1). This has allowed the two-electron reduced version of 2 to be generated and isolated. Reaction of 2 with on…
Abstract The electrochemical, photochemical and chemical control of the magnetic properties in molecular compounds is described. The preparation of various thin films of CrCr and FeFe Prussian blue on a conducting electrode allowed us to control the magnetic properties by varying the oxidation state of the component m…
In this paper, we report on the local apparent dissociation constants of poly(acrylic acid) and poly(allylamine hydrochloride) incorporated in polyelectrolyte multilayer thin films. We assembled 10 polyelectrolyte layers on colloidal silica by the sequential electrostatic adsorption of the polyacid and polybase from a…
The objective of this paper is to characterise sulphate resistance of mortars made from ordinary Portland cement ( PC ) and Portland-pozzolan cement with 35 wt.% of zeolite addition (zeolite-blended cement-ZBC ). Mortars with two different cement types were tested in water and 5% sodium sulphate solution for 720 days.…
Some physical properties of three ornamental granites with different superficial finishes (polished, sawn and flamed) were quantified by standard tests. These granites are commercially known as Rosa Porrino, Rosavel and Blanco Alcazar. The determined properties were: density, open porosity, water absorption, capillari…
We have studied the physical-mechanical behaviour of solid bricks treated with consolidants and/or water-repellents in accelerated aging tests to determine their durability. The bricks were manufactured with a quartz-rich clay lacking in carbonates to which was added small amounts of different additives (calcite, dolo…
A test method for evaluating wall paints behaviour to soluble salts crystallization was developed at LNEC. in the present paper, a recent set of tests is described and discussed. The major objectives were: analysing and comparing the behaviour of a common emulsion ("plastic") paint and a silicate-based paint; observin…
Admixtures are defined as those products that are incorporated in the moment of the process of mixture of the concrete in a quantity not bigger than 5 by mass of the cement %, with relationship to the cement content in the concrete, with object of modifying the properties of the mixture in .state fresh and/or hardened…
Natural pozzolans have been used since ancient times and continues to be used today. The chemistry and morphological composition of natural pozzolans and their particle size distribution allows classifying them as more or less reactive pozzolan. In this research several techniques have been used to study the influence…
Poultry by-products are not often processed into high-value products. Rather than being transformed into meal for animal feed, a large quantity of chicken skin could be used to produce collagen, which is valued for its unique functional properties. The purpose of this research project was to extract and characterize c…
Knowledge of the petrophysical characteristics of stones used in construction is evidently advantageous in the sense that it can help avoid wasting time and future disappointments when attempting to assess the results both in restoration work and in actual construction work. However, if the material used is sandstone,…
Using numerical simulations and analytical approximations we study a modified version of the two-dimensional lattice model [R. Piasecki,phys. stat. sol. (b) 209, 403 (1998)] for random pH:(1-p)L systems consisting of grains of high (low) conductivity for H-(L-)phase, respectively. The modification reduces a spectrum o…
To examine the freezing and melting behavior of water in partially filled pores of porous silica, we performed X-ray diffraction measurements of water confined inside the cylindrical pores of SBA-15 with a pore radius of 3.9 nm as a function of temperature and pore filling. The freezing temperature increased continuou…