LitCovid-sentences  

PMC:7796291 / 13443-17117 JSONTXT 2 Projects

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Id Subject Object Predicate Lexical cue
T120 0-4 Sentence denotes 3.1.
T121 5-63 Sentence denotes Filtration Performance with Varied Disinfection Treatments
T122 64-187 Sentence denotes Varied disinfection methods accessible to the general public were investigated for their effects on filtration performance.
T123 188-287 Sentence denotes Without disinfection treatments, both respirators showed very high filtration efficiency of ≥99.5%.
T124 288-503 Sentence denotes It should be noted that the filtration efficiency was measured after challenging the respective aerosols for 3 min (by the KF standard) [35], which corresponded to about 2.7 mg of NaCl and 8 mg of paraffin oil mass.
T125 504-686 Sentence denotes The filtration performance against NaCl and paraffin oil aerosols were comparable, and the effects of various treatments on filtration of either aerosol were very similar (Figure 2).
T126 687-843 Sentence denotes The resistances of respirators were mostly consistent regardless of treatments, except that laundering treatments slightly decreased the resistance of Resp.
T127 844-846 Sentence denotes A.
T128 847-962 Sentence denotes The physical characteristics of respirators before and after treatment were further investigated in later sections.
T129 963-1124 Sentence denotes As for the filtration efficiency, the organic solvents such as IPA and EtOH, and detergent-laundering deteriorated the filtration efficiency of both respirators.
T130 1125-1218 Sentence denotes Particularly for IPA and EtOH treatments, up to ~28% of efficiency was lost after treatments.
T131 1219-1481 Sentence denotes Considering that the resistance of the solvent-treated samples was unchanged, it can be inferred that the solvents caused the reduction of filtration performance by affecting the electrostatic filtration capacity, rather than disrupting the structural integrity.
T132 1482-1571 Sentence denotes Similarly, the filtration efficiency was notably reduced after laundering with detergent.
T133 1572-1764 Sentence denotes As laundering with water barely affected the filtration efficiency, this indicates that the detergent negatively affected it, probably through an impact on the electrostatic capture mechanism.
T134 1765-1911 Sentence denotes Physical treatments employing UV irradiation, oven-dry, and microwave irradiation caused little impact on the filtration efficiency or resistance.
T135 1912-2169 Sentence denotes Previous studies reported the deteriorated performance with thermal treatment of electret filters [10,41], but most of the performance deterioration occurred with harsher conditions (120 °C, 48 h) and especially for materials with high dielectric constants.
T136 2170-2367 Sentence denotes Aging the electret filter at an extremely high temperature can trigger the mobility of polymer chains and charge carriers, leading to the loss of charges and increased particulate penetration [41].
T137 2368-2606 Sentence denotes In this study, the polypropylene electret filters were treated by the oven-dry condition that was relatively mild and short-term (90 °C, 1 h); and for this reason, the oven-dry treatment caused negligible effect on the performance change.
T138 2607-2852 Sentence denotes UV irradiation may influence the performance by causing the surface oxidation, turning the surface hydrophilic [42]; and the increased conductivity in a humid condition can lead to the loss of charges, reducing the filtration efficiency [43,44].
T139 2853-3000 Sentence denotes However, UV irradiation, at the level of 10 W power with 253.7 nm wavelength, of this study did not significantly affect the filtration efficiency.
T140 3001-3231 Sentence denotes The results in Figure 2 show that thermal (oven-dry and microwave) and UV treatments hardly affected the filtration performance, aside from the fact that microwaving is not recommended for the safety reasons with metal components.
T141 3232-3310 Sentence denotes Samples laundered with water maintained the performance as the untreated ones.
T142 3311-3429 Sentence denotes However, the probable structural change, the torn coverweb (Figure S3), during the laundering procedure is of concern.
T143 3430-3553 Sentence denotes Thickness and porosity of filter webs after treatments showed little differences compared to the untreated webs (Table S1).
T144 3554-3674 Sentence denotes The residues on fibers after detergent-laundering is also of concern in the regard of environmental impacts (Figure S5).