Devices and methods are provided that permit efficient and selective separation of liquid biological specimens into at least two constituent components to facilitate subsequent quantitative and qualitative analysis on at least one analyte of interest in at least one of the components. The devices generally include one or more sample deposition regions supported on a base. Each sample deposition region includes a separation membrane for separating the liquid biological specimen into two different fractions. The first fraction is trapped by the separation membrane while the second fraction passes through the separation membrane and into a respective collection membrane. The separation and collection membranes are easily separable from the devices and can be utilized for further processing and analysis.

Devices and methods are provided that permit efficient and selective separation of liquid biological specimens into at least two constituent components to facilitate subsequent quantitative and qualitative analysis on at least one analyte of interest in at least one of the components. The devices generally include one or more sample deposition regions supported on a base. Each sample deposition region includes a separation membrane for separating the liquid biological specimen into two different fractions. The first fraction is trapped by the separation membrane while the second fraction passes through the separation membrane and into a respective collection membrane. The separation and collection membranes are easily separable from the devices and can be utilized for further processing and analysis.

An object of the present invention is to provide a method for producing a treatment liquid, having excellent filterability.

The method for producing a treatment liquid of an embodiment of the present invention is a method for producing a treatment liquid, the method including filtering an object to be purified including a surfactant, using a first filter having a first filter medium, to produce a treatment liquid for a semiconductor substrate, in which the first filter medium includes at least one selected from the group consisting of a nylon, a polyallyl sulfonic acid, a perfluoroalkoxy alkane which has been subjected to a hydrophilization treatment, a polytetrafluoroethylene which has been subjected to a hydrophilization treatment, a polyolefin which has been subjected to a hydrophilization treatment, and a polyvinylidene fluoride which has been subjected to a hydrophilization treatment, and the surfactant includes at least one selected from the group consisting of a nonionic surfactant including a group represented by Formula (1) and an anionic surfactant including a group represented by Formula (1).

Formula (1) (LO).sub.n

L represents an alkylene group, and n represents 3 to 55.

An object of the present invention is to provide a method for producing a treatment liquid, having excellent filterability.

The method for producing a treatment liquid of an embodiment of the present invention is a method for producing a treatment liquid, the method including filtering an object to be purified including a surfactant, using a first filter having a first filter medium, to produce a treatment liquid for a semiconductor substrate, in which the first filter medium includes at least one selected from the group consisting of a nylon, a polyallyl sulfonic acid, a perfluoroalkoxy alkane which has been subjected to a hydrophilization treatment, a polytetrafluoroethylene which has been subjected to a hydrophilization treatment, a polyolefin which has been subjected to a hydrophilization treatment, and a polyvinylidene fluoride which has been subjected to a hydrophilization treatment, and the surfactant includes at least one selected from the group consisting of a nonionic surfactant including a group represented by Formula (1) and an anionic surfactant including a group represented by Formula (1).

Formula (1) (LO).sub.n

L represents an alkylene group, and n represents 3 to 55.

The disclosure provides a porous polymeric membrane having ionizable nitrogen functional groups at least at its surface, wherein such groups are associated with a hydroxide anion. The membranes are useful in the purification of polar solvents such as water and alcohols and are capable of removing trace amounts of anionic contaminants such as halides, phosphates, nitrates, nitrites, sulfites, and sulfates.

The present disclosure relates to hollow fiber tangential flow filters, including hollow fiber tangential flow depth filters, for various applications, including bioprocessing and pharmaceutical applications, systems employing such filters, and methods of filtration using the same.

The present disclosure relates to hollow fiber tangential flow filters, including hollow fiber tangential flow depth filters, for various applications, including bioprocessing and pharmaceutical applications, systems employing such filters, and methods of filtration using the same.

A monolayer membrane containing gelling polymer particles having at least one of a basic functional group and an acidic functional group, and having a thickness of less than 5 μm. A composite having a porous carrier and gelling polymer particles having at least any one of a basic functional group and an acidic functional group and filling up the surface pores of the porous carrier. The invention can provide a novel material capable of efficiently separating an acid gas from a mixed gas.

A monolayer membrane containing gelling polymer particles having at least one of a basic functional group and an acidic functional group, and having a thickness of less than 5 μm. A composite having a porous carrier and gelling polymer particles having at least any one of a basic functional group and an acidic functional group and filling up the surface pores of the porous carrier. The invention can provide a novel material capable of efficiently separating an acid gas from a mixed gas.

Cationic polymers are provided that comprise monomeric units of Formula (V). (V) Each asterisk (*) indicates an attachment position to another monomeric unit; R is hydrogen or methyl; each R.sup.2 is each independently an alkyl, aryl, or a combination thereof; L is a linking group comprising an alkylene group; and +R.sup.3 is a cationic nitrogen-containing group free of any N—H bonds. Membranes formed from said cationic polymers, devices including such membranes, and methods of making such cationic polymers are also provided.

##STR00001##