The present invention provides a formulation and method for preparing a fibrous material comprising nanofibers. The formulation comprises (a) at least one polymer, (b) at least one solvent in which the at least one polymer is dissolved to provide a polymer solution, and (c) at least one functional additive that imparts functionality to the fibrous material. The at least one functional additive is dissolvable or suspensible in the polymer solution. The formulation is able to remove or reduce the concentration of bacteria, viruses and heavy metals while maintaining high filtration efficiency. The invention also relates to a fibrous material prepared by the formulation and applications of the fibrous material.

Filter media comprising water-repellent additives having minimal or no fluorine atoms are generally provided. In some embodiments, the water-repellent additives comprise one or more water-repellent functional groups. The water-repellent functional groups may comprise a carbon chain including three or more carbon atoms. In some embodiments, some or all of the water-repellent functional group(s) are bonded to a silicon atom and/or a metal atom. It is also possible for some or all of the water-repellent functional group(s) to form side chain(s) attached to a polymer backbone.

The disclosure discloses an anti-haze anti-harmful gas air filter membrane as well as a preparation method and application thereof. The air filter membrane comprises a nano fiber membrane made of nano fibers and having a two-dimensional or three-dimensional network structure. The nano fiber membrane can be a high-molecular polymer nano fiber membrane prepared by utilizing an electrostatic spinning process, and can also be doped with an organic or inorganic additive capable of adsorbing and absorbing harmful gases, such as VOCs, NO.sub.x, SO.sub.x and NH.sub.3, in the air and/or a photocatalyst capable of degrading these harmful gases in a photocatalysis manner, or the like. The anti-haze anti-harmful gas air filter membrane disclosed by the disclosure can efficiently filter PM2.5 and PM10 particulate pollutants and the like in the air and simultaneously can efficiently identify and clear multiple harmful gases in the air. The anti-haze anti-harmful gas air filter membrane has a wide application prospect in the field of air purification, for example, can be applied to air purification devices, such as screen windows, gauze masks and filter screens.

The present invention relates to a mask comprising a mask body for covering a wearer's face and wearing straps coupled to both sides of the mask body, the mask body comprising a filter member having: a support layer having a mesh structure; and a filter coating layer formed on the outer surface of the support layer and for filtering contaminants, wherein the filter coating layer is formed from a microfiber web eletrospinned on the support layer.

Embodiments herein relate to medical devices and methods for monitoring and/or treatment including the use of synthetic polymers exhibiting specific binding for compounds such as disease state markers or toxic substances. In an embodiment, a method of testing a patient for a disease state is included, the method can include withdrawing a fluid sample from the patient and contacting the fluid sample with an extracorporeal monitoring device. The extracorporeal monitoring device can include a microporous membrane. The microporous membrane can include a synthetic polymer, wherein the synthetic polymer exhibits binding specificity with a disease state marker. The method can further include evaluating the extracorporeal monitoring device for the presence of the disease state marker. Other embodiments are included herein.

The invention relates to a respiratory protection mask made of polyvinylidene fluoride and to a method for manufacturing said mask. The invention also relates to a method for reconditioning said mask. The invention also relates to a method for recycling this respiratory protection mask.

Disclosed herein is a degradable filter structures and protective coverings including degradable filter structures. The filter structures comprise cellulose acetate and optionally plasticizer. The filter structures and protective coverings described herein degrade more rapidly than other known protective coverings.

Filter media comprising polyethersulfone, related components, and related methods are generally described.

A high-adsorption-performance nanofiber filter medium includes a support material and a composite nanofiber filtration layer that includes multiple nanometer composite nanofiber layers deposited and stacked on the support material. The nanometer composite nanofiber layer includes first, second, and third nano-powder composite nanofibers, which are uniformly mixed by means of an airflow or are sequentially laminated to form the nanometer composite nanofiber layer. The nanometer composite nanofiber layer formed through sequential lamination includes first, second, and third nanofiber layers. The first nanofiber layer includes multiple first nano-powder composite nanofibers. The second nanofiber layer is stacked on the first nanofiber layer and includes multiple second nano-powder composite nanofibers. The third nanofiber layer is stacked on the second nanofiber layer and includes multiple third nano-powder composite nanofibers. The composite nanofiber filtration layer is formed of multiple nanometer composite nanofiber layers, so that the high-adsorption-performance nanofiber air filter medium shows improved performance.

Filter media comprising a pre-filter layer and related components, systems, and methods associated therewith are provided. In some embodiments, the pre-filter layer may be designed to impart desirable properties to the filter media, such as a high gamma and/or long service life, while having relatively minimal or no adverse effects on another property of the filter media that is important for a given application. For instance, a pre-filter layer may be used to improve the upstream removal of fine particulate matter, which may clog a downstream efficiency layer comprising submicron fibers and reduce filtration performance. The pre-filter layer may be configured to increase service life and/or increase the gamma of the filter media. Filter media, as described herein, may be particularly well-suited for applications that involve filtering air, though the media may also be used in other applications.