Wollastonite to hinder growth of Aspergillus niger fungus on cotton textile

Taghiyari, Hamid Reza; Majidinajafabadi, Reza; Vahidzadeh, Reza

doi:10.1590/0001-3765201820170914

Cited by 13 publications

(14 citation statements)

References 23 publications

(10 reference statements)

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“…The increase was attributed to the deteriorating effect of Aspergillus niger on textile fibers, decreasing their integrity and eventually, allowing a larger volume of air to pass through. The same deteriorating effect was reported to have caused considerable decline in tensile stress of cotton textile [18]. The similar increase in fluid flow rate in the control and NW-10% specimens indicated that 10% of NW is not enough to significantly hinder the growth of A. niger on cotton textile.…”

Section: Resultssupporting

confidence: 63%

“…The r-square value of 66% between fluid flow values versus tensile stress indicated that although fluid flow in cotton textile as a porous media was closely in relation with the integrity of the overall matrix, other elements were also involved in the process (Figure 10). In this connection, considering highly significant decreasing effect of fungal exposure on tensile stress and tensile strain values in a previous study [18], higher increase in fluid flow was expected. However, it is to be noted that growth of thick mycelium network on and within voids and spaces of control specimens partially blocked the way through transfer of fluid (Figure 9a).…”

Section: Resultsmentioning

confidence: 71%

“…On the other hand, higher NW concentrations (NW-20%, NW-30%, and NW-40%) demonstrated a decrease in flow rates ( Figure 6). A previous research project demonstrated that NW concentration of 20% significantly improved the biological resistance of cotton textile in a way that tensile stress values in the fungal-exposed NWimpregnated specimens were significantly similar to those of the control specimens [18]. Based on the above discussion, it was concluded that higher NW concentrations preserved the overall structure of cotton textile in a way that fungi mycelium could not penetrate deeply into textile structure and deteriorate it; instead the mycelium had to spread on the outer layer of textile specimens.…”

Section: Resultsmentioning

confidence: 86%

“…Mycelia that were grown on the specimens were then carefully removed and specimens were dried again before the final fluid flow measurement. Though previous studies have already illustrated the effectiveness of nano-wollastonite (NW) in preserving ligno-cellulose materials, including some textiles that are used in museums [9,10,17,18], further studies should be done to investigate other properties of currently used textiles as to the importance of artistic objects in museums. Therefore, the present project was carried out to elaborate on permeability, as an important physical property that ultimately affects dying and printability in textiles.…”

Section: Fungal Exposurementioning

confidence: 99%

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Fluid Flow in Cotton Textile: Effects of Wollastonite Nanosuspension and Aspergillus Niger Fungus

et al. 2019

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Aspergillus niger is a common contaminant in food industry, laboratories, and also a potential threat to biological works of art in museums. Cotton textiles have frequently been used in museums for canvas paintings. In the present project, the effect of Aspergillus niger on fluid flow rate of nanowollastonite-impregnated cotton textile specimens was investigated. Cotton specimens were impregnated with nanowollastonite (NW) suspension at four concentrations of 10%, 20%, 30%, and 40% to be further compared with control specimens. Results showed that fluid flow in cotton textile was as high as 361.3 cm3·s−1 due to its high porous structure and very low compactness of fibers (low density). Impregnation with NW did not have a significant effect on fluid flow in cotton textile. Exposure to Aspergillus niger increased fluid flow in control specimens as a result of deterioration of cotton fibers. Exposure of NW-impregnated specimens at concentrations more than 20% to Aspergillus niger did not have any significant effect on fluid flow. In control specimens, fungus mycelium penetrated deep into the texture of textile. However, in NW-impregnated specimens, the fungus could not penetrate into the texture and deteriorate the specimens. It was concluded that NW can be recommended for textile industry and also works of art as they protect cotton textiles against Aspergillus niger while, do not diminishi its dying and paintability properties.

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Section: Resultssupporting

confidence: 63%

Section: Resultsmentioning

confidence: 71%

Section: Resultsmentioning

confidence: 86%

Section: Fungal Exposurementioning

confidence: 99%

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Fluid Flow in Cotton Textile: Effects of Wollastonite Nanosuspension and Aspergillus Niger Fungus

et al. 2019

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“…Nanotechnology has been reported to improve the properties and eliminate some drawbacks in many composites and materials [9][10][11][12][13], although changes can occur in the material properties when the size range is reduced to nanometer scale [14]. For wood and wood-composites, different nanomaterials were utilized to further improve fire retardancy, biological resistance, water repellency, and mechanical properties [15][16][17][18][19][20][21][22][23]. Recently, nanowollastonite was applied with urea formaldehyde resin, which improved the thermal conductivity coefficient and, consequently, the mechanical and physical properties of OSL [12].…”

Section: Introductionmentioning

confidence: 99%

Improving Thermal Conductivity Coefficient in Oriented Strand Lumber (OSL) Using Sepiolite

et al. 2020

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An issue in engineered wood products, like oriented strand lumber (OSL), is the low thermal conductivity coefficient of raw material, preventing the fast transfer of heat into the core of composite mats. The aim of this paper is to investigate the effect of sepiolite at nanoscale with aspect ratio of 1:15, in mixture with urea-formaldehyde resin (UF), and its effect on thermal conductivity coefficient of the final panel. Sepiolite was mixed with UF resin for 20 min prior to being sprayed onto wood strips in a rotary drum. Ten percent of sepiolite was mixed with the resin, based on the dry weight of UF resin. OSL panels with two resin contents, namely 8% and 10%, were manufactured. Temperature was measured at the core section of the mat at 5-second intervals, using a digital thermometer. The thermal conductivity coefficient of OSL specimens was calculated based on Fourier’s Law for heat conduction. With regard to the fact that an improved thermal conductivity would ultimately be translated into a more effective polymerization of the resin, hardness of the panel was measured, at different depths of penetration of the Janka ball, to find out how the improved conductivity affected the hardness of the produced composite panels. The measurement of core temperature in OSL panels revealed that sepiolite-treated panels with 10% resin content had a higher core temperature in comparison to the ones containing 8% resin. Furthermore, it was revealed that the addition of sepiolite increased thermal conductivity in OSL panels made with 8% and 10% resin contents, by 36% and 40%, respectively. The addition of sepiolite significantly increased hardness values in all penetration depths. Hardness increased as sepiolite content increased. Considering the fact that the amount of sepiolite content was very low, and therefore it could not physically impact hardness increase, the significant increase in hardness values was attributed to the improvement in the thermal conductivity of panels and subsequent, more complete, curing of resin.

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