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Le, Thai Minh Duy,Duong, Huu Thuy Trang,Thambi, Thavasyappan,Giang Phan, V.H.,Jeong, Ji Hoon,Lee, Doo Sung American Chemical Society 2018 Biomacromolecules Vol.19 No.8
<P>Despite great potential, the delivery of genetic materials into cells or tissues of interest remains challenging owing to their susceptibility to nuclease degradation, lack of permeability to the cell membrane, and short in vivo half-life, which severely restrict their widespread use in therapeutics. To surmount these shortcomings, we developed a bioinspired in situ-forming pH- and temperature-sensitive injectable hydrogel depot that could control the delivery of DNA-bearing polyplexes for versatile biomedical applications. A series of multiblock copolymer, comprised of water-soluble poly(ethylene glycol) (PEG) and pH- and temperature-responsive poly(sulfamethazine ester urethane) (PSMEU), has been synthesized as in situ-forming injectable hydrogelators. The free-flowing PEG-PSMEU copolymer sols at high pH and room temperature (pH 8.5, 23 °C) were transformed to stable gel at the body condition (pH 7.4, 37 °C). Physical and mechanical properties of hydrogels, including their degradation rate and viscosity, are elegantly controlled by varying the composition of urethane ester units. Subcutaneous administration of free-flowing PEG-PSMEU copolymer sols to the dorsal region of Sprague-Dawley rats instantly formed hydrogel depot. The degradation of the hydrogel depot was slow at the beginning and found to be bioresorbable after two months. Cationic protein or DNA-bearing polyplex-loaded PEG-PSMEU copolymer sols formed stable gel and controlled its release over 10 days in vivo. Owing to the presence of urethane linkages, the PEG-PSMEU possesses excellent adhesion strength to wide range of surfaces including glass, plastic, and fresh organs. More importantly, the hydrogels effectively adhered on human skin and peeled easily without eliciting an inflammatory response. Subcutaneous implantation of PEG-PSMEU copolymer sols effectively sealed the ruptured skin, which accelerated the wound healing process as observed by the skin appendage morphogenesis. The bioinspired in situ-forming pH- and temperature-sensitive injectable adhesive hydrogel may provide a promising platform for myriad biomedical applications as controlled delivery vehicle, adhesive, and tissue regeneration.</P> [FIG OMISSION]</BR>
Duy, Le Thai,Lee, Gyuyeon,Kim, Jinseo,Ahn, Byungmin,Cho, In Sun,Yu, Hak Ki,Seo, Hyungtak Elsevier 2019 JOURNAL OF ALLOYS AND COMPOUNDS Vol.774 No.-
<P><B>Abstract</B></P> <P>Detection of hydrogen (H<SUB>2</SUB>) over a wide concentration range (from parts-per-million levels to 4%) is necessary for safety in using hydrogen-fuel cell systems. For this purpose, our development of H<SUB>2</SUB> sensitive nanohybrids of reduced graphene oxide (rGO) and chemochromic palladium-decorated molybdenum trioxide (Pd:MoO<SUB>3</SUB>) nanoflakes is presented. Additionally, the nanohybrids were employed as the active channel in a thin film transistor platform to invest informative characteristics for understanding their electrical properties and sensing mechanism. Through sensing measurements, (i) phenomena relating to response saturation and reversed behavior of gas sensors towards high exposure doses (i.e., p-to-n transition) and (ii) doping effects on the p-to-n transition and detection range of the hybrid materials are clarified. With combining electrical and visual output signals, the bimodal devices using the hole-doped nanohybrids can detect H<SUB>2</SUB> over a wide concentration range (from 10 ppm to over 10%) at room temperature. Our results reveal opportunities for further development and improvement of hybrid nanomaterials and chemical sensors having a large sensing capability.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Our nanohybrids have two sensing capabilities towards hydrogen. </LI> <LI> Transistor sensors provide information for understanding phenomena and mechanism. </LI> <LI> Effect of hole-doping on the detection range is explored. </LI> <LI> The bimodal sensors can detect hydrogen from 10 ppm to over 10%. </LI> <LI> Transition from p-to n-type behavior of the nanohybrid can cause its response saturation. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Duy, Le Thai,Kalanur, Shankara S.,Cho, In Sun,Seo, Hyungtak Elsevier 2018 Materials chemistry and physics Vol.218 No.-
<P><B>Abstract</B></P> <P>Deoxygenation of graphene oxide is a low-cost and effective way to yield graphene (i.e., reduced graphene oxide - RGO) for many applications. However, choices of reduction approach and reduction time need consideration due to damaging pre-existing materials on electronic devices. Here, we found a facile and eco-friendly route that was based on the photo-oxidation of ethanol (diluted in water) on a catalytic TiO<SUB>2</SUB> film to rapidly induce the formation of RGO within 15 min under UV (20 mW/cm<SUP>2</SUP>) or sun lights (1 sun = 100 mW/cm<SUP>2</SUP>). Our reduction route was indirectly activated by chain reactions of ethanol and TiO<SUB>2</SUB> (so-called domino effect) because the GO deoxygenation occurred even when the samples were placed around and not in contact with TiO<SUB>2</SUB> film. To obtain the highest reduction, the samples should stay on the catalytic film to receive lights for activation and acceleration of reactions. Furthermore, effects of exposure time (1–20 min), ethanol concentration (14.3–100%), and light intensity on RGO quality explored with the use of chemiresistive devices. The results of demonstrative sensing measurements towards NO<SUB>2</SUB> and NH<SUB>3</SUB> indicate that our method is promising for electrical applications using solution processable RGO.</P> <P><B>Highlights</B></P> <P> <UL> <LI> RGO can be rapidly formed through ethanol photolysis. </LI> <LI> Sunlight is used for activating and accelerating chain reactions. </LI> <LI> The reduction route is not based on the direct charge transfer between GO and TiO<SUB>2</SUB>. </LI> <LI> The domino effect of catalysis is promising for exploring further applications. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>An economical and rapid approach to reduce graphene oxide is developed for electronic applications. It is based on a domino effect that can extend the function as well as possible applications of a catalyst.</P> <P>[DISPLAY OMISSION]</P>
Le Thai Nam,Dao Duy Thang 한국유통과학회 2017 한국유통과학회 학술대회 논문집 Vol.2017 No.-
This study is empirically to examine relationship of Vietnam Online Shopping Mall Characteristic, System Quality and Consumer Reuse. Data was collected by administering a survey to consumer used online shopping mall. The survey questionnaire comprised of a 5-point Likert scale. The demographic analysis was conducted using the frequency analysis method and relationship of variable was conducted using the EFA analysis, reliability analysis, multiple regression analysis. The results of study are “online shopping mail characteristic effect to consumer satisfaction”, “system quality effect to consumer reliability” but “System interactivity don’t effect to consumer Reliability”, and “consumer reliability and satisfaction effect to Consumer reuse Intention”.
Nguyen Ngoc Duy Phuong,Mai Ngoc Khuong,Thai Hoang Quoc,Le Nguyen Thanh Dong 한국유통과학회 2017 KODISA ICBE (International Conference on Business Vol.2017 No.-
The purpose of this study was to examine the direct and indirect effect of ethical leadership, organizational justice, organizational support on employee satisfaction and employee engagement. Very little research has been conducted to study those relationships in the socialization context. This paper attempts to fill the gap by analyzing data from a survey of 677 employees from industrial parks. This study used a survey instrument that consists of 2 sections. To ensure content validity, the survey items were derived from those used in previous studies. Each item was measured using a 5-point Likert scale. Ethical leadership scale with ten items were adopted from Toor and Ofori (2009). Partial least square structural equation modeling (PLS-SEM) is employed for testing the structural models and exploratory study is also identified to evaluate the relationship among variables. The findings provided evidence that employee satisfaction is the most important to predict employee engagement. The results also reveal the important effect of ethical leadership, organizational justice and supporting environment on job satisfaction. Implications for public policy practice and further research are also suggested based on the results of structural analysis.