Seoul National University – TechConnect Briefs

The characterization and reductive degradation behavior study of bioreducible crosslinked polypropylenimine dendrimers for gene delivery systems

Lee G.J., Ryu K., Kim T.I., Seoul National University, KR

Polypropylenimine (PPI) dendrimers and their derivatives have been used for gene delivery because of their properties such as cationic charge, equivalent surface functionalities, and internal cavities [1–4]. However, high generation PPIs made high cytotoxicity induced [...]

Self-assembling peptide dimers with multifunctionalities for gene delivery systems

Ryu K., Lee G.J., Kim T.I., Seoul National University, KR

Peptides have been used in various biomedical fields including gene and drug delivery systems [1]. There are many peptide sequences which can interact with cellular molecules or components. These biological interactions of peptide represented many [...]

Nitrogen-doped porous carbon for the removal of Cr or As in aqueous solutions

Han J.S., Ha D.G., Han J.S., Kang S-H, Seoul National University, KR

The removal of hexavalent chromium and arsenic from aqueous solutions was investigated with nitrogen-doped porous carbon. Excellent adsorption behavior was obtained due to the strong attraction between [HCrO4]- or [H2AsO4]- and nitrogen sites under weak [...]

Hollow Granules of Nitrogen/Boron co-doped Carbon for CO2 Capture

Kim J., Han J., Ha D., Han J., Kang S., Seoul National University, KR

Carbide-derived carbon (CDC) has been examined due to its useful conformal character. However, its variety of chemical composition is limited because functionalized atoms in its carbonaceous structure, especially with nitrogen, are unstable during high-temperature processing. [...]

Hydrothermal synthesis of uniform porous carbon nanospheres and their gas storage capacity

Lee M.K., Nam S.W., Han J.S., Kang S., Seoul National University, KR

Highly porous nano carbon materials have been widely developed due to their advanced physical characteristics such as morphology, light weight, but more interestingly the possibility of designing the level of porosity as well as the [...]

Investigation on capillary force of nanoscale water cluster using a Hybrid AFM-MEMS System

Kwon S., Kim B., Jhe W., Seoul National University, KR

The interaction force between surfaces has a major effect on the behavior of the materials, such as nanoparticles, proteins, various bio-molecules, and so on. The phenomenon of stiction influenced by interaction forces impacts the repetitive [...]

Direct Observation of Nanofabrication using the Optical Microscope combined with Nanopipette/QTF-AFM System

An S., Stambaugh C., Kwon S., Lee K., Kim B., Kim Q., Kim B., Kim Q., Jhe W., Seoul National University, KR

We demonstrated direct observation of nanofabrication using the optical microscope (OM) combined with nanopipette/QTF-AFM (Quartz Tuning Fork-Atomic Force Microscopy) system. Various solutions are ejected onto the substrate through the nano-/micro-aperture of the pulled pipette, and [...]

Electric Double Layer Simulation on Transient State for Sensitivity Enhancement of Affinity-Based Biosensor

Woo J-M, Kim S-H, Park Y.J., Seoul National University, KR

We have presented a numerical simulation for the affinity-based electrical biosensor system on the steady and transient state. Considering the screening length in the solutions, the solution with low ion concentration can be better measurement [...]

A study of the Demolding Force in Nano Imprint Lithography For Different Surface Treatments

Moon S.N., Jung J-M, Lee K.M., Lee W.I., Lee K.M., Lee W.I., Seoul National University, KR

The NIL process can be divided into two steps: the pressing and demolding stages. In the pressing stage, micro/nano scale patterns on a mold are transferred to a polymer resist. During this stage, there are [...]

Investigation of Metal Nano Layer Formation by the Tunneling Current through the Thin Oxide Film in the Electrolyte–Oxide–Silicon System

Lee S-H., Cheon J-H, Choi S., Choi Y., Choi S., Choi Y., Park Y.J., Seoul National University, KR

In the researches on Electrolyte–Oxide–Silicon (EOS) system, tunneling current through the gate insulator has been considered as an undesirable factor causing reliability issues such as gate insulator degradation and interface state generation. In this work, [...]