Soňa Malečková

• PhD.
• Slovak University of Technology in Bratislava

This study focuses on the effectiveness of a new substance in stabilizing paper information carriers - hydrotalcite applied to the paper in a partially polar environment. The effect of modification on the stabilization of paper during accelerated aging was investigated by measuring chemical (surface pH, rate of glycosidic bond cleavage), mechanical...

Traditional stabilization techniques often struggle with limitations such as the need to sort documents prior to modification, the inability to mass deacidify books for aqueous systems, economic difficulty, environmental concerns etc [1, 2]. The period in recent years on which the paper focuses highlights the current efforts to advance the resoluti...

Preservation of cellulose cultural objects, particularly books, is a field of research with about 100 years of history. The most dangerous in terms of their lifespan is the use of acidic wood-based paper which represents a problem in both quality and durability. Acid hydrolysis of polymeric cellulose chains is a key factor responsible for loss of v...

Hydrotalcite samples were prepared in the form of powder and/or sol under different conditions and characterised by various techniques. A suitable system of liquid carriers consisting of perfluoroheptane, isopropanol, and water (PFH-IPA-H 2 O) was chosen to apply HTlcs as deacidifying agents on paper. The areas of miscibility and immiscibility in t...

Stabilization and deacidification of paper information carriers is still a highly discussed topic. It is very important to continue in searching for new, more effective, and affordable methods of paper stabilization because none of the currently known processes is ideal. This study focuses on the effectiveness of a new substance in stabilizing pape...

The aim of this work is to propose the first model hypothesis and function for predicting the efficacy of deacidification. We have used the dDEA as the first basic factor influencing the efficacy. The resulting relationship is based on the best achieved reliable η data and related dDEA data, from mass deacidification technologies used for the lifet...

In protecting cultural heritage, deacidification is used to stabilize acidic papers, ensuring the neutralization of acids present in the paper. But in the process of aging, several mechanisms of degradation occur simultaneously. Therefore, substances used to stabilize the paper should contain an antioxidant component in addition to the deacidifying...

Hydrotalcite samples were prepared in the form of powder and/or sol under different conditions and characterised by various techniques. A suitable system of liquid carriers consisting of perfluoroheptane, isopropanol, and water (PFH-IPA-H2O) was chosen to apply HTlcs as deacidifying agents to paper. The areas of miscibility and immiscibility in the...

Preservation of cellulosic cultural objects, particularly books, is a field of research with about 100 years of history. The most dangerous in terms of their lifespan is the use of acidic wood-based paper, which, due to the machine production of such paper, represents a problem in terms of both quality and durability. The acid hydrolysis of polymer...

Studying of paper carriers of information has become increasingly important in forensic practice. This is caused by growing number of bogus or in other manner fraudulently alternated documents. An identification of individual paper sheets and studying their differences are the parts of forensic analysis of multiple sheets documents. This paper focu...

The project “Biomass - Source of chemicals and biofuels” has as objective basic research of upgrading waste plant biomass to valuable compounds with high added value and to biofuels. As a waste plant biomass we understand mainly forest and land biomass, as well as biomass waste from industrial processing of vegetable raw materials (e.g. from food,...

It is described the preparation, which consists of 4-amino-2,2,6,6-tetramethylpiperidine in the amount of 0.5% by weight up to 3% by weight, deacidification agent in an amount to 30% by weight. and the others to 100% by weight. is a solvent. Preparation may be in form of solution and / or suspension, so in the form of a suspension is formed by a de...

The water retention value (WRV) as a measure of the capability of cellulose fibres to retain water (swelling of fibres) was evaluated during accelerated ageing of acidic wood pulp newspaper containing 20% chemical fibres. It has been found that the WRV considerably decreases with accelerated ageing. Relations between the WRV properties and the mech...

During natural ageing, paper undergoes colour changes and becomes brittle. It is mainly due to the degradation of cellulose, the main component of paper fibres. From the viewpoint of conservation/protection of paper-based information carriers, as well as of the utilisation of secondary fibres, knowledge of the impact of a decrease of the degree of...

Xylan sulphate derivatives with degree of substitution (DS) up to 1.40 at 90% yield for film applications were prepared. The structure and substitution were confirmed by 2D NMR spectroscopy and elemental analysis. The highest DS was obtained by sulphation with sulphur trioxide pyridine complex in N,N-dimethylformamide (DMF) when the least degradati...

In the restoration of a baroque altar painting “Coronation of the Virgin Mary” originating in 18th century, selection of materials was based on the examination of their stability evaluated by objective physico-chemical methods and by visual inspection. The stability of fillings prepared by traditional recipes, and new ones based on modern, commerci...

Xylan was 2-hydroxypropylsulfonated and/or 2-hydroxypropylquaternized for film application. All the products were water soluble with molar masses of the derivatives between Mn of 3.8 and 948.9kg/mol with polydispersity index D from 1.7 to 26.8. At the range from 100 to 250μm of thickness the material developed reproducible mechanical properties. Wh...

A preparation for a chemical modification of an old paper by a technical solution consists of 4-amino-2,2,6,6-tetramethylpiperidine in quantities from 0.5 % by weight to 3 % by weight, a deacidification agent up to 30 % by weight and the remainder to 100 % by weight is a solvent. The preparation may be in form of solution and/or suspension, wherein...

The task was aimed at elaborating optimum technological procedure to preserve historical carriers of information in acidic wood-containing paper, selecting and further improving the best available technologies, and establishing conditions for their sustainable development in SR. The best available technology (BAT) for books was selected – Papersave...

The task was aimed at elaborating optimum technological procedure to preserve historical carriers of information in acidic wood-containing paper, selecting and further improving the best available technologies, and establishing conditions for their sustainable development in SR. The best available technology (BAT) for books was selected – Papersave...

The task was aimed at elaborating optimum technological procedure to preserve historical carriers of information in acidic wood-containing paper, selecting and further improving the best available technologies, and establishing conditions for their sustainable development in SR. The best available technology (BAT) for books was selected – Papersave...

The task was aimed at elaborating optimum technological procedure to preserve historical carriers of information in acidic wood-containing paper, selecting and further improving the best available technologies, and establishing conditions for their sustainable development in SR. The best available technology (BAT) for books was selected – Papersave...

The task was aimed at elaborating optimum technological procedure to preserve historical carriers of information in acidic wood-containing paper, selecting and further improving the best available technologies, and establishing conditions for their sustainable development in SR. The best available technology (BAT) for books was selected – Papersave...

The task was aimed at elaborating optimum technological procedure to preserve historical carriers of information in acidic wood-containing paper, selecting and further improving the best available technologies, and establishing conditions for their sustainable development in SR.

Generally it is believed that the visibility and recognisability of a document depend on optical contrast between the characters and the paper backround. The aim of this work was to test this hypothesis and to quantify the effect of accelerated ageing and paper modification with piperidine-based antioxidant on the visibility and recognisability of...

Modification of lignin-cellulose fibres by magnesium compounds leads to their better retention of water. Modification by magnesium compounds inhibits hornification of fibres along the process of ageing. The probable mechanism of the modification is based on reaction of magnesium compounds that are transported into the paper in organic phase by wate...

The ageing of paper has been studied for about hundred years with the aim to understand the mechanism of the degradation and to develop methods for stopping or slowing it down, in order to save paper-based cultural heritage. This paper describes an evaluation of paper ageing by the method of gel permeation chromatography (GPC) of cellulose tricarba...

Abstract The cultural heritage on paper in archives and libraries is being destroyed by ageing. The biggest problems in preservation of books and archival documents are caused in modern papers produced from the 2nd half of the 19th century up to the recent decades. The lignocellulosic carriers of information are formed and stored mostly as stacks....

Paper and other lignocellulosic materials undergo the destruction as a result of ageing, influenced by various factors and accelerated by the formation of acids from components, used during its production [S. Katuščák, Wood Res. 45 (2000) 1; S. Katuščák, L. Ďurišová, Wood Res. 118 (1988) 75]. Various deacidification processes were developed in an o...