The Experts below are selected from a list of 1701 Experts worldwide ranked by ideXlab platform
Wah Chiu - One of the best experts on this subject based on the ideXlab platform.
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decontamination of sars cov 2 and other rna viruses from n95 level meltblown Polypropylene Fabric using heat under different humidities
ACS Nano, 2020Co-Authors: Rafael K Campos, Grace H Rafael, Mervin Zhao, Lei Liao, Graham Simmons, Scott C Weaver, Wah ChiuAbstract:In March of 2020, the World Health Organization declared a pandemic of coronavirus disease 2019 (COVID-19), caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The pandemic ...
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decontamination of sars cov 2 and other rna viruses from n95 level meltblown Polypropylene Fabric using heat under different humidities
ACS Nano, 2020Co-Authors: Rafael K Campos, Grace H Rafael, Mervin Zhao, Lei Liao, Graham Simmons, Scott C Weaver, Wah Chiu, Jing Jin, Steven Chu, Yi CuiAbstract:In March of 2020, the World Health Organization declared a pandemic of coronavirus disease 2019 (COVID-19), caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The pandemic led to a shortage of N95-grade filtering facepiece respirators (FFRs), especially surgical-grade N95 FFRs for protection of healthcare professionals against airborne transmission of SARS-CoV-2. We and others have previously reported promising decontamination methods that may be applied to the recycling and reuse of FFRs. In this study we tested disinfection of three viruses, including SARS-CoV-2, dried on a piece of meltblown Fabric, the principal component responsible for filtering of fine particles in N95-level FFRs, under a range of temperatures (60-95 °C) at ambient or 100% relative humidity (RH) in conjunction with filtration efficiency testing. We found that heat treatments of 75 °C for 30 min or 85 °C for 20 min at 100% RH resulted in efficient decontamination from the Fabric of SARS-CoV-2, human coronavirus NL63 (HCoV-NL63), and another enveloped RNA virus, chikungunya virus vaccine strain 181/25 (CHIKV-181/25), without lowering the meltblown Fabric's filtration efficiency.
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decontamination of sars cov 2 and other rna viruses from n95 level meltblown Polypropylene Fabric using heat under different humidities
medRxiv, 2020Co-Authors: Rafael K Campos, Grace H Rafael, Mervin Zhao, Lei Liao, Graham Simmons, Scott C Weaver, Wah ChiuAbstract:In March of 2020, the World Health Organization declared a pandemic of coronavirus disease 2019 (COVID-19), caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The pandemic led to a shortage of N95-grade filtering facepiece respirators (FFRs), especially for protection of healthcare professionals against airborne transmission of SARS-CoV-2. We and others have previously reported promising decontamination methods that may be applied to the recycling and reuse of FFRs. In this study we tested disinfection of three viruses including SARS-CoV-2, dried on a piece of meltblown Fabric, the principal component responsible for filtering of fine particles in N95-level FFRs, under a range of temperatures (60-95°C) at ambient or 100% relative humidity (RH) in conjunction with filtration efficiency testing. We found that heat treatments of 75°C for 30 min or 85°C for 20 min at 100% RH resulted in efficient decontamination from the Fabric of SARS-CoV-2, human coronavirus NL63 (HCoV-NL63) and chikungunya virus vaccine strain 181 (CHIKV-181), without lowering the meltblown Fabric9s filtration efficiency.
Weizhong Chen - One of the best experts on this subject based on the ideXlab platform.
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developing a Polypropylene Fabric silica fume and redispersible emulsion powder cementitious composite for dynamic water environment
Polymers, 2018Co-Authors: Jinquan Liu, Pooya Saffari, Qichao Liang, Weizhong ChenAbstract:In the dynamic water environment, grouting requires a material with higher strength and anti-washout performance to prevent groundwater inrush. This study aims to develop a dynamic water slurry by mixing Polypropylene fiber (PP fiber), silica fume (SF) and the polymer material of redispersible emulsion powder (REP) to the Portland cement. Towards this aim, a series of tests, including strength, gel time, bleeding rate, fluidity, and anti-washout, were conducted to evaluate the effects of SF, PP fiber, and REP on the slurry properties. The test results show that: (1) SF displays significant effects on strength, gel time, fluidity, and bleeding rate of cement slurry. Differently, PP fiber mainly affects the stress–strain behavior of the slurry and can improve the ductility significantly. (2) By mixing SF and fiber simultaneously, the slurry strength can increase by about 30%, and its strain can extend by more than 70%. Meanwhile, the composite slurry possesses great anti-washout properties at a low flow velocity (v ≤ 0.4 m/s), and the grouting retention rate (GRR) can reach up to 98.7%. However, the GRR decreases to a maximum value of 31.3% when v = 0.6 m/s. (3) By mixing the REP into the fiber-SF composite slurry, the GRR can further increase, reaching more than 60% even when v = 0.6 m/s. As a result, the developed fiber-SF cementitious composite slurry, which when mixed with REP, presents a favorable performance in the dynamic water environment.
Rafael K Campos - One of the best experts on this subject based on the ideXlab platform.
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decontamination of sars cov 2 and other rna viruses from n95 level meltblown Polypropylene Fabric using heat under different humidities
ACS Nano, 2020Co-Authors: Rafael K Campos, Grace H Rafael, Mervin Zhao, Lei Liao, Graham Simmons, Scott C Weaver, Wah ChiuAbstract:In March of 2020, the World Health Organization declared a pandemic of coronavirus disease 2019 (COVID-19), caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The pandemic ...
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decontamination of sars cov 2 and other rna viruses from n95 level meltblown Polypropylene Fabric using heat under different humidities
ACS Nano, 2020Co-Authors: Rafael K Campos, Grace H Rafael, Mervin Zhao, Lei Liao, Graham Simmons, Scott C Weaver, Wah Chiu, Jing Jin, Steven Chu, Yi CuiAbstract:In March of 2020, the World Health Organization declared a pandemic of coronavirus disease 2019 (COVID-19), caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The pandemic led to a shortage of N95-grade filtering facepiece respirators (FFRs), especially surgical-grade N95 FFRs for protection of healthcare professionals against airborne transmission of SARS-CoV-2. We and others have previously reported promising decontamination methods that may be applied to the recycling and reuse of FFRs. In this study we tested disinfection of three viruses, including SARS-CoV-2, dried on a piece of meltblown Fabric, the principal component responsible for filtering of fine particles in N95-level FFRs, under a range of temperatures (60-95 °C) at ambient or 100% relative humidity (RH) in conjunction with filtration efficiency testing. We found that heat treatments of 75 °C for 30 min or 85 °C for 20 min at 100% RH resulted in efficient decontamination from the Fabric of SARS-CoV-2, human coronavirus NL63 (HCoV-NL63), and another enveloped RNA virus, chikungunya virus vaccine strain 181/25 (CHIKV-181/25), without lowering the meltblown Fabric's filtration efficiency.
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decontamination of sars cov 2 and other rna viruses from n95 level meltblown Polypropylene Fabric using heat under different humidities
medRxiv, 2020Co-Authors: Rafael K Campos, Grace H Rafael, Mervin Zhao, Lei Liao, Graham Simmons, Scott C Weaver, Wah ChiuAbstract:In March of 2020, the World Health Organization declared a pandemic of coronavirus disease 2019 (COVID-19), caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The pandemic led to a shortage of N95-grade filtering facepiece respirators (FFRs), especially for protection of healthcare professionals against airborne transmission of SARS-CoV-2. We and others have previously reported promising decontamination methods that may be applied to the recycling and reuse of FFRs. In this study we tested disinfection of three viruses including SARS-CoV-2, dried on a piece of meltblown Fabric, the principal component responsible for filtering of fine particles in N95-level FFRs, under a range of temperatures (60-95°C) at ambient or 100% relative humidity (RH) in conjunction with filtration efficiency testing. We found that heat treatments of 75°C for 30 min or 85°C for 20 min at 100% RH resulted in efficient decontamination from the Fabric of SARS-CoV-2, human coronavirus NL63 (HCoV-NL63) and chikungunya virus vaccine strain 181 (CHIKV-181), without lowering the meltblown Fabric9s filtration efficiency.
Jinquan Liu - One of the best experts on this subject based on the ideXlab platform.
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developing a Polypropylene Fabric silica fume and redispersible emulsion powder cementitious composite for dynamic water environment
Polymers, 2018Co-Authors: Jinquan Liu, Pooya Saffari, Qichao Liang, Weizhong ChenAbstract:In the dynamic water environment, grouting requires a material with higher strength and anti-washout performance to prevent groundwater inrush. This study aims to develop a dynamic water slurry by mixing Polypropylene fiber (PP fiber), silica fume (SF) and the polymer material of redispersible emulsion powder (REP) to the Portland cement. Towards this aim, a series of tests, including strength, gel time, bleeding rate, fluidity, and anti-washout, were conducted to evaluate the effects of SF, PP fiber, and REP on the slurry properties. The test results show that: (1) SF displays significant effects on strength, gel time, fluidity, and bleeding rate of cement slurry. Differently, PP fiber mainly affects the stress–strain behavior of the slurry and can improve the ductility significantly. (2) By mixing SF and fiber simultaneously, the slurry strength can increase by about 30%, and its strain can extend by more than 70%. Meanwhile, the composite slurry possesses great anti-washout properties at a low flow velocity (v ≤ 0.4 m/s), and the grouting retention rate (GRR) can reach up to 98.7%. However, the GRR decreases to a maximum value of 31.3% when v = 0.6 m/s. (3) By mixing the REP into the fiber-SF composite slurry, the GRR can further increase, reaching more than 60% even when v = 0.6 m/s. As a result, the developed fiber-SF cementitious composite slurry, which when mixed with REP, presents a favorable performance in the dynamic water environment.
Scott C Weaver - One of the best experts on this subject based on the ideXlab platform.
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decontamination of sars cov 2 and other rna viruses from n95 level meltblown Polypropylene Fabric using heat under different humidities
ACS Nano, 2020Co-Authors: Rafael K Campos, Grace H Rafael, Mervin Zhao, Lei Liao, Graham Simmons, Scott C Weaver, Wah ChiuAbstract:In March of 2020, the World Health Organization declared a pandemic of coronavirus disease 2019 (COVID-19), caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The pandemic ...
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decontamination of sars cov 2 and other rna viruses from n95 level meltblown Polypropylene Fabric using heat under different humidities
ACS Nano, 2020Co-Authors: Rafael K Campos, Grace H Rafael, Mervin Zhao, Lei Liao, Graham Simmons, Scott C Weaver, Wah Chiu, Jing Jin, Steven Chu, Yi CuiAbstract:In March of 2020, the World Health Organization declared a pandemic of coronavirus disease 2019 (COVID-19), caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The pandemic led to a shortage of N95-grade filtering facepiece respirators (FFRs), especially surgical-grade N95 FFRs for protection of healthcare professionals against airborne transmission of SARS-CoV-2. We and others have previously reported promising decontamination methods that may be applied to the recycling and reuse of FFRs. In this study we tested disinfection of three viruses, including SARS-CoV-2, dried on a piece of meltblown Fabric, the principal component responsible for filtering of fine particles in N95-level FFRs, under a range of temperatures (60-95 °C) at ambient or 100% relative humidity (RH) in conjunction with filtration efficiency testing. We found that heat treatments of 75 °C for 30 min or 85 °C for 20 min at 100% RH resulted in efficient decontamination from the Fabric of SARS-CoV-2, human coronavirus NL63 (HCoV-NL63), and another enveloped RNA virus, chikungunya virus vaccine strain 181/25 (CHIKV-181/25), without lowering the meltblown Fabric's filtration efficiency.
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decontamination of sars cov 2 and other rna viruses from n95 level meltblown Polypropylene Fabric using heat under different humidities
medRxiv, 2020Co-Authors: Rafael K Campos, Grace H Rafael, Mervin Zhao, Lei Liao, Graham Simmons, Scott C Weaver, Wah ChiuAbstract:In March of 2020, the World Health Organization declared a pandemic of coronavirus disease 2019 (COVID-19), caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The pandemic led to a shortage of N95-grade filtering facepiece respirators (FFRs), especially for protection of healthcare professionals against airborne transmission of SARS-CoV-2. We and others have previously reported promising decontamination methods that may be applied to the recycling and reuse of FFRs. In this study we tested disinfection of three viruses including SARS-CoV-2, dried on a piece of meltblown Fabric, the principal component responsible for filtering of fine particles in N95-level FFRs, under a range of temperatures (60-95°C) at ambient or 100% relative humidity (RH) in conjunction with filtration efficiency testing. We found that heat treatments of 75°C for 30 min or 85°C for 20 min at 100% RH resulted in efficient decontamination from the Fabric of SARS-CoV-2, human coronavirus NL63 (HCoV-NL63) and chikungunya virus vaccine strain 181 (CHIKV-181), without lowering the meltblown Fabric9s filtration efficiency.