http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
- 검색키워드
- 주제어 : Sol-gel phase transition (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
-
Choi, Hyun Jun,Kim, So Young,Gong, Min Kyung,Vignesh, Hari,Aravindan, Vanchiappan,Lee, Young Gi,Lee, Yun-Sung Elsevier 2017 Journal of Alloys and Compounds Vol.729 No.-
<P><B>Abstract</B></P> <P>We prepared and optimized the ionically conducting perovskite-type Li<SUB>0.33</SUB>La<SUB>0.56</SUB>TiO<SUB>3</SUB> by an adipic acid-assisted sol-gel process. A high ionic conductivity of 0.131 mS cm<SUP>−1</SUP> was obtained at an ambient temperature by adjusting the synthesis temperature, holding time, and cooling process. A dramatic improvement in the Li<SUB>0.33</SUB>La<SUB>0.56</SUB>TiO<SUB>3</SUB> conductivity was noted in each step. Interestingly, a tetragonal-to-cubic structural transition was evident during the quenching process unlike in the conventional slow cooling process. An increase in the bottleneck site volume was observed that facilitated Li<SUP>+</SUP> ion migration for enhanced conductivity.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Adipic acid assisted sol-gel process is utilized to prepare Li<SUB>0.33</SUB>La<SUB>0.56</SUB>TiO<SUB>3</SUB>. </LI> <LI> High ambient temperature ionic conductivity of 0.131 mS cm<SUP>−1</SUP> is realized. </LI> <LI> Transition from tetragonal to cubic is one of the main reason for such conductivity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
-
1P-189 Preparation of thermo-sensitive hydrogel for drug delivery
구현철,한가득,손태일 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Stimuli-sensitive hydrogel has various types of pH-sensitive, thermosensitive, electric-sensitive and light-sensitive etc. The hydrogel which happen to physical or chemical change due to each external stimulus can be applied to a medical and cosmetic fields such as sustained release drug delivery, wound dressing, and skin care. Many studies have been carried out on application of drug delivery due to the characteristics of sensitive polymers to temperature. Some polymers such as Methoxypoly(ethylene glycol)-Poly(caprolactone)(mPEG-PCL), poly(lactic acid-co-glycolic acid)(PLGA-PEG-PLGA), and poly(ethylene oxide-propylene oxide-ethylene oxide) (PEO-PPO-PEO) have a reversible sol-gel phase transition at a specific temperature. For in vivo application, the phase transition temperature of the thermo-sensitive polymer was prepared to be 37°C, body temperature, and had fast gel formation time. The drug release time of prepared hydrogel was evaluated to suit the purpose of the drug.
-
Preparation of Thermo-Sensitive Hydrogel for Drug Delivery
한가득,손태일,구현철 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Thermo-sensitive hydrogel which happen to physical or chemical change in specific temperature can be applied to a medical and cosmetic fields such as sustained release drug delivery, wound dressing, and skin care. Many references about thermos-sensitive hydrogels have studied the reversible sol-gel phase transition at specific temperatures using polymers such as Methoxypoly(ethylene glycol)-Poly (caprolactone)(mPEG-PCL), poly(lactic acid-co-glycolic acid)(PLGAPEG- PLGA), and poly(ethylene oxide-propylene oxide-ethylene oxide) (PEO-PPO-PEO). We have conducted study using poloxamer 407 with PEO-PPO-PEO structure and gelling agent. For in vivo application, the Sol-Gel phase transition time of the thermo-sensitive polymer was determined at body temperature of 37°C. Physicochemical properties and drug release pattern of the hydrogel was evaluated to suit the purpose of the drug delivery device.
-
Preparation and Field-Induced Electrical Properties of Perovskite Relaxor Ferroelectrics
Huiqing Fan,Biaolin Peng,Qi Zhang 한국전기전자재료학회 2015 Transactions on Electrical and Electronic Material Vol.16 No.1
(111)-oriented and random oriented Pb0.8Ba0.2ZrO3 (PBZ) perovskite relaxor ferroelectric thin films were fabricatedon Pt(111)/TiOx/SiO2/Si substrate by sol-gel method. Nano-scaled antiferroelectric and ferroelectric two-phasecoexisted in both (111)-oriented and random oriented PBZ thin film. High dielectric tunability (η = 75%, E = 560 kV/cm ) and figure-of-merit (FOM ~ 236) at room temperature was obtained in (111)-oriented thin film. Meanwhile,giant electrocaloric effect (ECE) (ΔT = 45.3 K and ΔS = 46.9 JK-1kg-1 at 598 kVcm-1) at room temperature (290 K), ratherthan at its Curie temperature (408 K), was observed in random oriented Pb0.8Ba0.2ZrO3 (PBZ) thin film, which makesit a promising material for the application to cooling systems near room temperature. The giant ECE as well as highdielectric tunability are attributed to the coexistence of AFE and FE phases and field-induced nano-scaled AFE to FEphase transition.
-
Effect of affinity on the structure formation in highly size asymmetric bimodal suspensions
Jung, Yoon Se,Lee, Joo Young,Ahn, Kyung Hyun,Lee, Seung Jong Elsevier 2018 Colloids and surfaces. A, Physicochemical and engi Vol.538 No.-
<P><B>Abstract</B></P> <P>We investigate the influence of inter-particle affinity on the microstructure and rheological behavior in the bimodal suspension systems. For this purpose, we design the suspensions using two kinds of polystyrene beads (PS, size ∼530nm) as a large particle which are electrostatically stabilized and are different in surface properties only, while keeping unstable alumina coated silica (Al-silica, size ∼12nm) as a small particle. To change the affinity, hydrogen bonding is induced by modifying surface of PS as poly (vinyl pyrrolidone) (PVP). The influence of affinity between large and small particles is investigated by observing the changes in rheological properties and microstructure. Even with the same, the formation of Al-silica cluster which connects large particles is dominant when sulfate modified PS is used and the affinity between the particles is not strong. On the contrary, the Al-silica particles cover the surface of large particles rather than making bridges when PVP modified PS is used and the affinity is strong. The phase map which shows fluid-gel transition according to the composition of the suspension is also obtained. The affinity is found to affect the shape of the phase map too. This research explains how the differences in affinity between large and small particles affect the bimodal suspensions according to the surface properties of the particles, and provides an insight on the complex behavior of particulate fluids.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
