Ree M. – TechConnect Briefs

Characterization of Nanaoporous Low-Dielectric Constant SiCOH Films using Organosilane Precursor

Heo K., Jin K.S., Jin S., Park S.-G., Ree M., Rhee S.W., Yoon J., Pohang University of Science and Technology, KR

The grazing incidence small-angle X-ray scattering (GISAXS) and X-ray reflectivity (XR) analysis were performed to investigate the nanoporous structure of low dielectric constant carbon-doped silicon oxide (SiCOH) films, which were deposited with plasma enhanced chemical [...]

Synchrotron X-Ray Scattering Studies of Star-Shape Polymers

Heo K., Higashihara T., Hirao A., Jin K.S., Jin S., Kim J., Kim K.W., Ree M., Yoon J., Pohang University of Science and Technology, KR

The physical properties of well-defined star-shape polystyrenes with high number of arms (6 to 57 arms) in good and theta solvents were studied using synchrotron X-ray scattering. The scattering profiles for multi-armed polystyrenes shown the [...]

Quantitative Synchrotron Grazing Incidence X-ray Scattering Analysis of Cylindrical Nanostructure in Supported Thin Films

Heo K., Joo W.-C., Kim J.K., Lee B., Ree M., Yang S.-Y., Yoon J., Pohang University of Science and Technology, KR

Grazing incidence X-ray scattering (GIXS) has emerged as a powerful technique for characterizing internal structure of hin film. The X-ray beam impinges at a grazing angle onto the sample slightly above the critical angle, so [...]

Quantitative Synchrotron Grazing Incidence X-ray Scattering and Reflectivity Analysis of Nano-structures and Patterns Supported with Substrates

Chang T., Choi S.C., Heo K., Hwang Y., Jin K.S., Jin S., Kim G., Kim H., Kim J-S, Kim J., Kim K.W., Lee B., Oh W., Park I., Park Y.H., Ree M., Yoon J., Pohang University of Science & Technology, KR

Single-layer, multi-layer, and patterned nanostructures were fabricated with aids of substrates from various material systems (polymers, diblock copolymers, polymer blends, alumina precursors, silane precursor, etc.) using wet spin-coating and subsequent dry and thermal process, chemical [...]

Carbonate ion sensing electrode membrane based on poly(vinyl chloride) and its property characteristics

Byun G., Kim D., Kim H-C, Park S-D., Ree M., POETECH, KR

A series of poly(vinyl chloride) (PVC) membranes containing a carbonate ion sensible ionophore, a lipophilic additive, and a plasticizer in various compositions was prepared and then investigated in detail in the aspects of properties and [...]

Biocompatibilities of some synthetic polymers in films

Kim G., Kim H., Ree M., Yoon J., Pohang University of Science and Technology, KR

Materials for artificial devices require biocompatibility with the human body. Moreover, it has been well known that the implants are facilely tainted with pathogenic bacteria during surgical processes and that a few bacteria circulate in [...]

A Synchrotron X-ray Scattering Study on the Structure of Pepsin in Solution

Heo K., Jin K.S., Jin S., Kim J., Ree M., Yoon J., Pohang University of Science and Technology, KR

To understand the conformational behavior of a protein, it is necessary to define not only the structure of its native state but also that of various denatured states. Recent studies have revealed the biological significance [...]

Polyimides with Fluorenyl Side Groups and Their Unusual, Unique Alignability of Liquid Crystals at the Film Surface

Hahm S.G., Lee T.J., Ree M., Pohang University of Science and Technology, KR

Polyimides (PIs) have been widely used in the microelectronics industry as dielectric materials because of their advantageous properties. In the present study, we synthesized CBDA-FDA and its analogue, poly(4,4’-(9,9-fluorenyl)diphenylene pyromellitimide) (PMDA-FDA) and then investigated quantitatively [...]

Anchoring and alignment behavior of liquid crystals on poly(vinyl cinnamate) thin films

Hahm S.G., Lee S-W., Lee T.J., Ree M., Pohang University of Science and Technology, KR

At present, a rubbing process using a fabric is the only technique adopted in the LC display industry to treat PI film surfaces for the mass-production of flat-panel LC display devices. However, this process has [...]