Hydrated negative air ions generated by air–water collision with TiO<sub>2</sub> photocatalytic materials

Zhang, Chaoying; Wu, Zengnan; Wang, Chang; Li, Haifang; Li, Zenghe; Lin, Jin‐Ming

doi:10.1039/d0ra08693b

Cited by 9 publications

(8 citation statements)

References 19 publications

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“…Therefore, the above results deduce that as the ambient relative humidity increased, the concentration gradient of NAIs decreased which ultimately mean that the effective operating range of the ionizer was reduced. This is because higher relative humidity means the presence of more water molecules in the air, and these water molecules would surround and combine with the NAIs released from the ionizer, forming hydrated NAIs [18]. Hydrated NAIs are essentially heavy ions which result in lower electrical mobility or in other words, slower ions [19].…”

Section: Effect Of Humidity On Distribution Of Naismentioning

confidence: 99%

The effect of air velocity and indoor ambient properties on the effective operating range of an air ionizer device

Karim¹,

Nagentrau²,

Ling³

et al. 2023

J. Phys.: Conf. Ser.

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Air ionizers are devices that purify the indoor air by artificially generating negative air ions (NAIs) which are proven to improve air quality and well-being of humans. Hence, more ionizers are being incorporated into heating, ventilation and air conditioning (HVAC) applications nowadays. . Every ionizer has its effective range of operation, which is the area inside a room that can potentially be covered by significant concentration of NAIs compared to the general concentration of ions naturally present in the room. This range may change depending on the indoor temperature, humidity and fan speed of the HVAC unit as preferred by the room occupants. Present research intends to design an experimental setup that could measure negative air ion (NAI) concentration at varying distances from an ionizer under different values of the aforementioned parameters. The experiment was conducted inside an indoor psychrometric test room to allow controlling of ambient temperature and humidity. Air velocity through the ionizer was varied from 1.5 m/s to 4.5 m/s, whereas the range of temperature and relative humidity were set from 25°C to 31°C and 60% to 80% respectively. To evaluate the ionizer’s operating range, NAI concentration was measured at every preset longitudinal (0 cm to 75 cm), lateral (-25 cm to 25 cm) and elevation (-15 cm to 15 cm) distance relative to the ionizer for 6 minutes using an ion counter named “Air Ion Counter Model AIC2”. The results reveal that the ionizer’s effective operating range increased with velocity, with the furthest range recorded at 4.5 m/s. Whereas a negative correlation was found between the ionizer’s effective operating range with temperature and humidity, with the furthest range recorded at 25°C and 60% respectively. The results also show that most ions were distributed in areas below and towards the right side from the ionizer’s perspective.

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Section: Effect Of Humidity On Distribution Of Naismentioning

confidence: 99%

The effect of air velocity and indoor ambient properties on the effective operating range of an air ionizer device

Karim¹,

Nagentrau²,

Ling³

et al. 2023

J. Phys.: Conf. Ser.

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“…However, when the temperature exceeded 45 C, the growth of NAI concentration slowed down again due to the NAI saturation capacity of germanium. 19 The NAI production curves of germanium-PA6 fibers at varying pressures are shown in Figure 5(b). Unlike the effect of varying temperatures on the NAI release property, the growth of NAI concentration showed an approximate linear growth with the increase of pressure applied to germanium-PA6 fibers from 10 N to 30 N, indicating that the stimulation of pressure to the extranuclear electrons of germanium is more sensitive than that of thermo energy, leading to an even growth of NAIs.…”

Section: Nai Release Propertymentioning

confidence: 99%

Novel germanium-polyamide6 fibers with negative air ions release and far-infrared radiation as well as antibacterial property

Zhi

Wang

et al. 2022

Textile Research Journal

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There has been much concern about germanium because of its special atomic nuclear structure to generate negative electrons and far-infrared ray. In this study, novel germanium-polyamide6 fibers were prepared by using micro–nano structured germanium particles as a functional component via melt spinning. The effects of germanium concentration on the morphology, mechanical, negative air ion-releasing, and far-infrared radiation properties of the germanium-polyamide6 fibers were systematically investigated. Besides, the antibacterial activity and mechanism of the fibers against Staphylococcus aureus and Escherichia coli were also discussed. Even though the added germanium particles negatively affected the mechanical performance of the fiber, they were distributed well in the polyamide6 substrate when the concentration was increased from 2% to 6%. Increasing the temperature and pressure induced the germanium-polyamide6 fibers to produce more negative air ions and high far-infrared emissivity. The negative air ion-releasing property of the fiber led to antibacterial performance against S. aureus with more than 99% antibacterial rate. The results confirmed the great application potential of germanium in healthcare, medical, home, and apparel textiles.

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“… 9 In recent years, many successful approaches have been developed to purify indoor air. 10 − 12 Physical filtration is one of the typical methods, and the purification efficiency depends on the performance of the filtration materials, such as glass fiber, polyester fiber, and needle-punched fiber. 13 , 14 However, it is difficult to widely apply these advanced purification materials in residential spaces due to the limitations of lifetime and maintenance cost.…”

Section: Introductionmentioning

confidence: 99%

“…Indoor air quality, especially the concentration of fine particulate matter, is associated with the increased risk of some respiratory diseases. − The suspended particles are composed of volatile organic compounds (VOCs), heavy metals, silicate, black carbon, and nitrate, which can cause serious health problems, such as asthma, lung cancer, and even mortality. − Since people spend the majority of their time indoors, scientifically controlling particulate exposure can help eliminate the potential safety risks associated with the particulate matter in an indoor environment . In recent years, many successful approaches have been developed to purify indoor air. − Physical filtration is one of the typical methods, and the purification efficiency depends on the performance of the filtration materials, such as glass fiber, polyester fiber, and needle-punched fiber. , However, it is difficult to widely apply these advanced purification materials in residential spaces due to the limitations of lifetime and maintenance cost. Another commonly used air purification technology, electrostatic precipitator (ESP), has been extensively used for cleaning the air in buildings and has a high purification efficiency for fine particles .…”

Section: Introductionmentioning

confidence: 99%

Nickel Coated Polyester Sponge for Delaying the Specific Aggregation of Fine Particles Induced by Negative Air Ions

Zhang

Lin

et al. 2022

ACS Omega

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Negative air ions (NAIs) produced by corona discharge is often used for indoor air purification; however, the specific aggregation of suspended particles caused by NAIs, especially fine particles (FPs), needs to be considered. Here, a nickel coated conductive sponge (NCCS) was used as the main adsorption interface for delaying the obstinate aggregation caused by NAIs on another surface. The specific aggregation of FPs is caused by the directional transfer of electric charge, and the oxidation characteristic of NAIs results in the surface reaction of FPs simultaneously. The conductivity and roughness of the adsorption interface determine the migration direction and enrichment number of FPs, respectively. Nickel coated conductive sponge with high conductivity and high specific surface area can effectively adsorb the FPs affected by NAIs and can effectively delay the specific aggregation on the surface of indoor objects.

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Hydrated negative air ions generated by air–water collision with TiO₂ photocatalytic materials

Abstract: Illustration of a hydrated negative air ion generation system, water droplets and O2 molecular capture electrons generated by TiO2 to form water cluster ions.

Cited by 9 publications

References 19 publications

The effect of air velocity and indoor ambient properties on the effective operating range of an air ionizer device

The effect of air velocity and indoor ambient properties on the effective operating range of an air ionizer device

Novel germanium-polyamide6 fibers with negative air ions release and far-infrared radiation as well as antibacterial property

Nickel Coated Polyester Sponge for Delaying the Specific Aggregation of Fine Particles Induced by Negative Air Ions

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Hydrated negative air ions generated by air–water collision with TiO2 photocatalytic materials

Abstract: Illustration of a hydrated negative air ion generation system, water droplets and O2 molecular capture electrons generated by TiO2 to form water cluster ions.

Cited by 9 publications

References 19 publications

The effect of air velocity and indoor ambient properties on the effective operating range of an air ionizer device

The effect of air velocity and indoor ambient properties on the effective operating range of an air ionizer device

Novel germanium-polyamide6 fibers with negative air ions release and far-infrared radiation as well as antibacterial property

Nickel Coated Polyester Sponge for Delaying the Specific Aggregation of Fine Particles Induced by Negative Air Ions

Contact Info

Product

Resources

About

Hydrated negative air ions generated by air–water collision with TiO₂ photocatalytic materials