Wyniki wyszukiwania - BazTech

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Microstructure silica leached by NaOH from semi-burned rice husk ash for moisture adsorbent

A’yuni D.Q., Subagio A., Hadiyanto H., Kumoro A.C., Djaeni M.

Archives of Materials Science and Engineering

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2021

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Vol. 108, nr 1

5--15

EN

Purpose: This work aims to study the water vapor adsorption property of fine silica particles from semi-burned rice husk ash. The semi-burned rice husk ash is selected as the raw material since it contains high silica and is easily found as a by-product of pottery furnace combustion. Design/methodology/approach: The silica adsorbent from semi-burned rice husk ash was prepared through a sol-gel method using various NaOH concentrations. In doing so, the different pH precipitation was also observed. Here, the fine silica powder was obtained by pulverizing dry sol-gel. The product characterizations were conducted based on water adsorption capacity at different air relative humidity. Findings: The results show no significant effects of different treatments in the extraction and gelation process. The fine silica particles exhibit large porous surfaces with agglomerated nano-sized particles that formed pores. This porous structure is related to the distributions of pore size of each sample, which mostly obey the mesoporous characteristics. From sorption isotherm, weak adsorbent-adsorbate bonding was observed and demonstrated multilayer adsorption of mesoporous materials. Research limitations/implications: The study of water adsorption was carried out at room temperature, which can change at any time, even though has no significant effect on the humidity. However, it is needed to study the adsorption in an incubated area to receive a constant temperature. Practical implications: The products namely silica prepared from semi-burned rice husk ash show a high moisture uptake, especially at a high relative humidity region. This property can be comparable with the other silica preparation methods. So, this product can be a highly potential adsorbent for air or gas dehumidification systems. Originality/value: The silica-based semi-burned rice husk ash as a water adsorbent is more sustainable than commercial silica. This is a positive contribution to find a potentially develop water vapor adsorbent with good adsorption capacity. Besides, the synthesis process is a simple and low-cost process.

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Investigation of the mechanism of moisture absorption in colloidal museum materials in order to improve the safety of exhibits and improve the hygiene of museum rooms

Dovhaliuk Volodymyr, Ujma Adam, Chovniuk Yurii

System Safety : Human - Technical Facility - Environment

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2019

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Vol. 1, nr 1

805--809

EN

Moisture sorption is one of the most important destruction factors for colloidal capillary-porous exhibits in museums (painting, clothing etc.), which is dependent on microclimate in museum rooms. The analysis of moisture sorption properties, kinetics of sorption and swelling of textile museum exhibits is carried out. Isotherms of desorption of viscose and woollen yarns and fabrics of different density (and threads of them) are identical. The analysis of the isotherms of fabrics of various fibre cloths and threads of them shows that they all are similar in shape to the curves and have the form typical for leading capillary-porous bodies. The hysteresis loop for almost all tissues is observed throughout the range of relative humidity of the medium. In this work, the characteristics of the hysteresis loop (area, limited by it, length of the loop), which are of informational significance in the description of the processes of isothermal sorption-desorption of the materials mentioned above, are indicated. The research results allow optimizing of microclimate control in museum rooms for elimination of destruction of exhibits, improve the safety of storage and ensure the hygiene of the air indoor environmental.

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Badania właściwości cieplno–wilgotnościowych materiałów higroskopijnych z surowców pochodzenia roślinnego

Kaczorek D., Pietruszka B.

Fizyka Budowli w Teorii i Praktyce

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2015

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T. 7, nr 1

39--44

PL

W artykule przedstawiono badania podstawowych właściwości cieplno-wilgotnościowych naturalnych materiałów higroskopijnych. Uzyskane wyniki posłużyły do dalszych badań mających na celu określenie wpływu zróżnicowanych profili obciążeń wilgocią na możliwości absorpcji, magazynowania oraz oddawania wilgoci przez poszczególne materiały. Wyniki przeprowadzonych badań potwierdziły, że na zachowanie poszczególnych materiałów pod wpływem danego profilu obciążeń wilgocią mają wpływ jego właściwości sorpcyjne oraz przepuszczalność pary wodnej.

EN

This paper presents the study of basic hygrothermal properties of natural, hygroscopic materials. The results were used for further studies to determine the effect of different moisture load profiles on the possibility to absorb and release moisture by different materials. Results of this study confirmed that the behavior of individual materials under the influence of the moisture load profile is affected by the moisture sorption properties and water vapor permeability.

4

Wpływ impregnacji olejem wstępnie wysuszonej izolacji transformatora na czas i skuteczność suszenia końcowego

Krause C., Wick K., Nachtigall U., Marciniak W. R., Malewski R.

Wiadomości Elektrotechniczne

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2013

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R. 81, nr 3

15-20

PL

Przedstawiono wyniki badań doświadczalnych na dyfuzję wilgoci w suchej i zaimpregnowanej olejem celulozie.

EN

The paper presents results of experimental research regarding diffusion of humidity in cellulose, dry and impregnated with oil.

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Migracja soli rozpuszczalnych w otynkowanych, murowanych ścianach obiektów poddanych długotrwałemu zawilgoceniu

Kamiński K.

Materiały Budowlane

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2011

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nr 3

33-34

6

Water-Soluble Alginate Fibres for Medical Applications

Mikołajczyk T.

Fibres & Textiles in Eastern Europe

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2001

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Vol. 9, no. 3 (34)

20--23

EN

The paper concerns the development of conditions for the manufacture of water-soluble sodium alginate fibres with very good moisture absorption properties and a high capability to imbibe water from a wet substrate. Their tenacity at a level of 12 N/tex makes it possible to process them into medical dressing materials. Antibacterial properties of these fibres can be obtained by adding an antibiotic into the fibre-spinning solution during the technological process.

PL

Opracowano warunki wytwarzania rozpuszczalnych w wodzie włókien z alginianu sodowego o bardzo dobrych właściwościach sorpcyjnych i wysokiej zdolności do pochłaniania wody z wilgotnego podłoża. Wytrzymałość właściwa na poziomie 12 cN/tex umożliwia ich przerób włókienniczy na środki opatrunkowe. Wprowadzenie antybiotyku do roztworu przędzalniczego nadaje włóknom właściwości antybakteryjne.