Materials Literature
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Conjugated polymers with low band gap have been come into the spotlight for high performance of organic solar cells due to their broad absorption range in the visible and near-infrared region leading to high current density. Unfortunately, lowering band gap often lead to high HOMO level of the polymers, which makes lo…
Global warming was becoming more and more of a concern as a result of the continuing emission of a major greenhouse gas, carbon dioxide (CO₂), which is generated from fossil fuel combustion. However, fossil fuels were demanded as an essential resource. Therefore, it is essential to technology of reduced CO₂ emission.…
대표적인 전도성 고분자인 PEDOT:PSS 필름은 높은 전기적 전도도, 광투과도, 구조적 안정성 등으로 인해 유기전자 분야에서 많은 관심을 모으고 있다. 그러나 1S/cm 이하의 낮은 필름 전도도는 다양한 응용분야의 제약을 초래하고 있으며, 현재까지의 PEDOT:PSS 연구는 dimethyl sulfoxide, ethylene glycol, d-sorbitol등 높은 끓는점을 갖는 극성 용매나 황산 등을 첨가하여 전도도를 개선하는 것에 집중되어 왔다. PEDOT:PSS 필름의 전도도 향상에 대한 연구는 많이 진행된 반면, 필름의 낮은 내수성과 표면 특성에 대한 개선…
Impact de l’autoxydation sur les propriétés des tanins
수열합성법에 의해 구리(II) 착물, [Cu(4,4``-bpy)(SO4)2(H2O)3].2H20(1)(4,4-bpy=4,4-Bipyridine)을 합성하였고 원소분석과 단결정 X-선 회절법으로 구조를 확인하였다. 착물에서 구리(II) 이온들은 6-배위 구조로 되어 있으며 두개의 구리(II) 이론들은 4,4-bipyridine에 의해 연결되어 1D-골격을 가지고 있다.
Purpose: To investigate factors influencing the evaluation of background parenchymal enhancement (BPE) at follow-up breast magnetic resonance imaging (MRI) after adjuvant endocrine therapy. Materials and Methods: One hundred twelve women with breast cancer and MRI of the contralateral unaffected breast before and afte…
Polymer electrolyte membrane(PEM) fuel cells is an attractive future generation for a variety of advantages about environments. There are several fascinating reasons for operating PEMFC at high temperature and low related humidity. For these reasons, studies of proton exchange membrane with high proton conductivity an…
In this work, the electrochemical behaviors of grahphene/TiO2 composite were studied. The GO was synthesized by modified Hummers' method. The chemical composition analysis of grahphene/TiO2 composite was confirmed by X-ray photoelectron spectroscopy. The structural properties were characterized by XRD. Electrochemical…
Small interfering RNA (siRNA) has recognized as a potential drug due to its target-specific gene silencing. Due to their innate physiochemical characteristics, however, the systemic delivery of naked siRNA fails to achieve therapeutically relevant gene silencing. To this end, a variety of cationic polymers and lipids…
Different types of anion conducting membranes with low vanadium co-ion crossover were evaluated for a vanadium redox flow battery. Three kinds of polymer electrolytes consisting of anion exchangeable functionals were introduced into porous hydrocarbon substrates and crosslink-polymerized by radical polymerization in t…
Food process technology has been improved different packaging methods in improving shelf life of perishable foods such as meat and meat products. Regarding that improving of contamination have caused to develop and enhancement of active packaging in recent years, thus active packaging has been changed condition of inn…
Photo and thermal sensitive polymer was composed of 2-hydroxyethyl acrylate, acrylic coumarin and ethyl methacrylate (HEA-AC-EMA). When the contents of AC and EMA both were 2%, the lower critical solution temperature (LCST) is around 35°C. With the contents of AC together with EMA increasing, the LCST decreased effect…
We accelerate the rate of sensitizer neutralization on nanocrystalline TiO2 electrode surfaces using 3,4,5-tris-butenyloxy benzoic acid. 1H NMR and contact angle measurements revealed that the terminal double bonds reacted with I2 to form an ionic layer of I- species. Transient absorption spectroscopy and electrochemi…
A dye sensitized solar cell (DSSC) employing a polypyrrole-1 (PPy1), polypyrrole-2 (PPy2) and polypyrrole-2/multi wall carbon nanotube composite film (PPy2/MWCNT) counter electrodes (CEs) modified by different electrolyte composition. It is shown that the introduction of anionic surfactant, sodium dodecyl sulfate (SDS…
Hydrogel mask packs are attracting cosmetic materials due to it’s high elasticity and penetration properties of oxygen and nourishment that essentially need for skin. In this study, the physical properties of mask packs using natural materials such as ceratonia siliqua gum, agarose, gelatin, carrageenan, xanthan gum a…
This work describes a ternary screen-printed electrode system, composed of aqueous poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonic acid) (PEDOT:PSS), graphene, and hydrous ruthenium (IV) oxide (RuO2) nanoparticles for use in high-performance electrochemical capacitors. As a polymeric binder, PSS allows stable…
A novel alternating polymers with fluorinated quinoxaline as electrondeficient unit and five different electron-rich aromatic units were synthesized by Stille and Suzuki coupling reaction. Bis(trimethyltin)-4,8- bis(2-octyloxy)benzo[1,2-b:3,4-b']dithiophene, 4,4-bis(2-ethylhexyl)-4Hcyclopenta 4Hcyclopenta[ 1,2-b:5,4-b…
The dye-sensitized solar cell (DSSC) plays a leading role in third generation photovoltaic devices. Platinum nanoparticles-coated conducting glass has been widely used as the standard counter electrode (CE) for DSSCs. However, the high cost and the rarity of platinum limits its practical application in DSSCs. This has…
The demand of high energy storage for large grid application and transportation intensifies the interest for new materials with high energy density, long life span and low cost. Lithium sulfur (Li-S) battery is expected to promote the state-of-art battery technologies and upgrade the capability that current batteries…
Hierarchically structured polyaniline decorated reduced graphene oxide/SiO2 (PANI/RGO-a-SiO2) nanocomposite has been prepared using in situ polymerization. The XPS and XRD analysis demonstrate that the each synthetic step was successfully accomplished, and SEM and TEM clearly show that urchin-like structure PANI/RGO-a…