Abstract: The present invention relates to a method for a superabsorbent polymer. The preparation method controls the time from the addition of a foaming agent to the initiation of a polymerization reaction, thereby forming an appropriate pore structure in a superabsorbent polymer. The superabsorbent polymer produced through the preparation method can exhibit a remarkably improved absorption rate while exhibiting excellent absorption performance.

Abstract: A super absorbent polymer and a method for producing the same are disclosed herein. In some embodiments, the super absorbent polymer includes a base polymer powder including a cross-linked polymer, and first and second surface cross-linked layers formed on the base polymer powder. The first and second surface cross-linked layers are formed by further cross-linking the cross-linked polymer in the presence of a surface crosslinking agent, wherein the first and second surface cross-linked layers each include a cross-linked structure derived from epoxy-based and non-epoxy-based surface crosslinking agents. The super absorbent polymer can exhibit excellent absorbent properties even in a swollen state and thus exhibit excellent anti-rewetting effects. Accordingly, when the super absorbent polymer is used, it is possible to provide a sanitary material such as a diaper or a sanitary napkin which can give a smooth touch feeling even after the body fluid is discharged.

Abstract: The present invention relates to a super absorbent polymer. In the super absorbent polymer according to the present invention, the content of each of the super absorbent polymer particles having different surface shapes among particles constituting the polymer is optimized, and this not only an absorbent capacity and an absorbency under load are excellent but also the rewetting phenomenon can be effectively prevented.

Abstract: Provided are a superabsorbent polymer and a preparation method thereof. The superabsorbent polymer may effectively avoid a rewetting phenomenon after absorbing liquid, because a saline solution hardly remains in the empty spaces between swollen gel particles. Accordingly, the superabsorbent polymer may be used to provide hygienic materials, such as diapers, sanitary napkins, etc., which have a fluffy texture even after body fluid is discharged thereto.

Abstract: The present invention relates to a method for preparing a superabsorbent polymer, and a superabsorbent polymer prepared thereby. A superabsorbent polymer prepared by the preparation method exhibits minimized deterioration of physical properties after being pulverized, and thus basic absorbance performance is excellent and an excellent liquid permeability and absorbance rate can be exhibited.

Abstract: The present invention relates to a method for preparing a superabsorbent polymer, and a superabsorbent polymer prepared thereby. A superabsorbent polymer prepared by the preparation method exhibits minimized deterioration of physical properties after being pulverized, and thus basic absorbance performance is excellent and an excellent liquid permeability and absorbance rate can be exhibited.

Abstract: The present invention relates to a method for preparing superabsorbent polymer that has not only excellent permeability and absorption speed, but also minimized absorbency under pressure decrease rate, and superabsorbent polymer prepared thereby.

Abstract: The present invention relates to a super absorbent polymer. The super absorbent polymer contains polymer particles formed of large pores in a certain amount or more, and thus can exhibit large surface area and excellent initial absorption capacity. Therefore, when the super absorbent polymer is used, it can provide a sanitary material such as a diaper or a sanitary napkin which can quickly absorb body fluids and impart a dry and soft touch feeling.

Abstract: In a method of manufacturing a vertical memory device, a first sacrificial layer including a nitride is formed on a substrate. A mold including an insulation layer and a second sacrificial layer alternately and repeatedly stacked on the first sacrificial layer is formed. The insulation layer and the second sacrificial layer include a first oxide and a second oxide, respectively. A channel is formed through the mold and the first sacrificial layer. An opening is formed through the mold and the first sacrificial layer to expose an upper surface of the substrate. The first sacrificial layer is removed through the opening to form a first gap. A channel connecting pattern is formed to fill the first gap. The second sacrificial layer is replaced with a gate electrode.

Abstract: Provided is a method of preparing a superabsorbent polymer which exhibits more improved liquid permeability and absorption rate while maintaining excellent absorption performance. The method of preparing the superabsorbent polymer may include the steps of: performing crosslinking polymerization of water-soluble ethylene-based unsaturated monomers having acidic groups which are at least partially neutralized in the presence of an internal crosslinking agent to form a water-containing gel polymer including a crosslinked polymer; drying, pulverizing, and size-sorting the water-containing gel polymer to form a base polymer powder; performing surface-crosslinking of the base polymer powder using a surface-crosslinking solution including one or more surface-crosslinking agents in the presence of first alumina particles; and adding second alumina particles to the surface-crosslinked base polymer powder and then mixing them with each other.

Abstract: The present invention provides a method for preparing a superabsorbent polymer, the method comprising the steps of: forming a function gel polymer by cross-linked polymerization of a monomer mixture under the presence of an internal cross-linking agent, the monomer mixture including a water-soluble ethylene-based unsaturated monomer having an acid group at least part of which is neutralized, a carbonate, a volatile organic solvent, a surfactant, and a bubble promoting agent; forming a base resin powder by drying, grinding, and classifying the function gel polymer; and forming a surface cross-linked layer by additional cross-linking of the surface of the base resin powder under the presence of a surface cross-linking agent. The method for preparing a superabsorbent polymer may provide a superabsorbent polymer which has a porous structure, thereby exhibiting an excellent absorption rate while exhibiting excellent gel strength.

Abstract: The present invention relates to a method for preparing superabsorbent polymer that has not only excellent permeability and absorption speed, but also minimized absorbency under pressure decrease rate, and superabsorbent polymer prepared thereby.

Abstract: A SAP evaluation apparatus includes: a main body installed with a lifting bar that is raised or lowered; a container portion installed under the lifting bar in the main body and having an internal containing space for containing an absorber; an operating portion connected to the lifting bar and having a lifting plate that is raised or lowered within the containing space and applies pressure to the absorber and an injection portion for injecting an ink in the direction of the absorber; a dispersion measurement portion for measuring the dispersion of the ink through the absorber; and a controller installed at the main body to measure absorption of the ink into the absorber and measure swelling capacity of the absorber while the ink is injected into the absorber.

Abstract: Various embodiments of the present disclosure provide an antenna device and/or an electronic device including the antenna device. The antenna device may include: a circuit board; a conductive layer disposed in a partial region of the circuit board; a first radiation conductor disposed at one side of the conductive layer on the circuit board; and second radiation conductors disposed at one side of the conductive layer on the circuit board, the second radiation conductors being respectively disposed at opposite sides of the first radiation conductor to be symmetrical to each other. The first radiation conductor may transmit or receive a wireless signal in a first frequency band, and the second radiation conductors may transmit or receive a wireless signal in a second frequency band that is different from the first frequency band.

Abstract: A caisson block construction method, including: manufacturing a plurality of bottom caisson blocks having a plurality of first unit compartments disposed consecutively in a horizontal direction; manufacturing a plurality of upper caisson blocks having a plurality of second unit compartments; forming a bottom caisson block structure by installing the plurality of bottom caisson blocks side by side in the horizontal direction; installing the plurality of upper caisson blocks above the installed bottom caisson blocks; filling with rubble the second unit compartment of the upper caisson block positioned above the first unit compartment for rubble and exposed upward; inserting a vertical reinforcing bar module after the upper caisson blocks are installed; and forming a vertical concrete column for joining by casting concrete into the upper part of the second unit compartment in which the vertical reinforcing bar module is inserted.

Abstract: The present invention relates to a base station antenna comprising: a reflective plate; at least one first band radiation element positioned on the upper surface of the reflective plate, including a first power feed unit, and having a first wavelength (?H); and at least one second band radiation element positioned on the upper surface of the reflective plate, including a second power feed unit, and having a second wavelength (?L), wherein the first power feed unit is connected to a power feed line on the lower surface of the reflective plate, and the power feed line is shorted with the reflective plate at a short point spaced apart at a preset interval from the first band radiation element.

Abstract: The present invention relates to an olefin polymer and a method for producing the same. The super absorbent polymer can exhibit excellent absorbent properties even in a swollen state and thus exhibit excellent anti-rewetting effects. Accordingly, when the super absorbent polymer is used, it is possible to provide a sanitary material such as a diaper or a sanitary napkin which can give a smooth touch feeling even after the body fluid is discharged.

Abstract: A voltage generator configured to generate a plurality of voltage groups, each of the plurality of voltage groups including a plurality of reference voltages, and a decoder having an output node configured to output one of the plurality of reference voltages is disclosed. The decoder includes switch blocks that correspond to the plurality of voltage groups. Each of the switch blocks includes transistors that are turned on or off by or in response to a control signal, and each transistor in one of the switch blocks has a channel width different from a channel width of each transistor in another one of the switch blocks.

Abstract: A method is provided for preparing a super absorbent polymer capable of exhibiting an excellent absorption rate by including a uniform porous structure through a simple and economical process. The method includes: performing a crosslinking polymerization of a water-soluble ethylenically unsaturated monomer to form a hydrogel polymer; drying and pulverizing the hydrogel polymer; classifying the pulverized polymer into polymer particles having a particle size of at least 10 to 150 ?m, polymer particles having a particle size of 150 to 200 ?m, and polymer particles having a particle size of 200 to 850 ?m to form a base polymer powder having a particle size of 150 to 850 ?m; and surface-crosslinking the base polymer powder, wherein in the crosslinking polymerization step, the foaming polymerization proceeds in the presence of polymer particles having an average particle size of 10 to 200 ?m obtained in the classifying step and an anionic surfactant.

Abstract: Disclosed are an optical input/output device and an opto-electronic system including the same. The device includes a bulk silicon substrate, at least one vertical-input light detection element monolithically integrated on a portion of the bulk silicon substrate, and at least one vertical-output light source element monolithically integrated on another portion of the bulk silicon substrate adjacent to the vertical-input light detection element. The vertical-output light source element includes a III-V compound semiconductor light source active layer combined with the bulk silicon substrate by a wafer bonding method.