An indoor air cleaning system is disclosed and includes at least one gas detector, at least one cleaning device and a cloud computing server. The gas detector is disposed in an indoor space for detecting air pollution and outputting an air pollution information. The cleaning device includes a fan, a filter and a sterilization component. The fan is enabled to guide airflow passing through the filter and the sterilization component. The cloud computing server receives the air pollution information, stores to a database, and intelligently outputs a control command to the cleaning device according to the air pollution information, so that the fan of the cleaning device generates a directional circular airflow, and the air pollution is rapidly guided to pass through the filter and the sterilization component multiple times for filtration and sterilization. Consequently, gas state in the indoor space reaches the cleanliness of the clean room classes.

Devices are provided for remote environmental and atmospheric testing that can be deployed without personnel entering a potentially dangerous area. The device can detect and automatically analyze biological and chemical agents and then automatically report if any of these agents are present without the intervention of public safety or military personnel. During sample collection and analysis, the device deploys a sample-collecting pad, tape, or filter which is then retracted with captured samples (liquid or solid) obtained from either surfaces or as aerosols from the air. The captured samples may be retracted into an enclosed vessel which will then extract the sample off of the pad, tape, or filter into a liquid carrier, and this liquid carrier is delivered to a downstream process for further analysis. The steps between sample collection and analysis are completely automated and include solvent washes, extractions, centrifugations, or other steps that are not normally readily amenable to totally-hands-off automation.

A filtration barrier comprises at least one barrier layer which includes polymeric nanofibers interlaced with microfibers, and at least one substrate layer which includes polymeric microfibers. The filtration barrier can be made by electrospinning process.

A filtration barrier comprises at least one barrier layer which includes polymeric nanofibers interlaced with microfibers, and at least one substrate layer which includes polymeric microfibers. The filtration barrier can be made by electrospinning process.

An air filter unit may include at least one ionization unit and at least one filter medium arranged downstream of the ionization unit. The ionization unit may include at least one corona discharge electrode, at least one counter-electrode, and at least one voltage source. The at least one filter medium may include at least one electret layer, at least one mechanically separating layer, and at least one electrically conductive layer adjoining the mechanically separating layer. In an airflow direction extending from an inflow side toward an outflow side, the electret layer, the mechanically separating layer, and the electrically conductive layer may be arranged one after another in this order.

In an aspect, there is provided a hybrid pad set for providing concurrent active and passive filtering in an air filter housing. The hybrid pad set may include a non-pleated active filter media and a pleated passive filter media. The pleated passive filter media may be constructed of a nano-engineered material.

A filter and a method for manufacturing same are disclosed. The filter including nanofibers formed by electrospinning comprises: a base having conductivity; and a nanofiber web formed by attaching the nanofibers on the base. The method for manufacturing the filter by attaching nanofibers on a base comprises the steps of: filling a syringe having a nozzle with a polymer solution, which is a raw material of the nanofibers; applying a +high voltage to the nozzle; and spinning the nanofibers from the nozzle toward the base. The base functions as a counter electrode of the nozzle.

Decontaminating materials and methods of making and using the same are provided. The material comprises a network comprising electrospun polymeric nanofibers and at least 50 grams of metal organic framework (MOF) microparticles per m.sup.2 of the network based on the entire area of the network. A composition of the polymeric nanofibers comprises a hydroscopic polymer. An area of the material is defined by an outer surface of the network. The MOF microparticles are retained between the polymeric nanofibers in the network and are configured to decontaminate a chemical threat agent in contact with the material.