Effects of Hybrid Coat on shear bond strength of five cements: an in vitro study

Yue Guo,Hou-De Zhou,Yun-Zhi Feng 대한치과보철학회 2017 The Journal of Advanced Prosthodontics Vol.9 No.6

PURPOSE. To evaluate the sealing performance of Hybrid Coat and its influence on the shear bond strength of five dentin surface cements. MATERIALS AND METHODS. Six premolars were pretreated to expose the dentin surface prior to the application of Hybrid Coat. The microscopic characteristics of the dentinal surfaces were examined with scanning electron microscopy (SEM). Then, 40 premolars were sectioned longitudinally, and 80 semi-sections were divided into a control group (untreated) and a study group (treated by Hybrid Coat). Alloy restoration was bonded to the teeth specimen using five different cements. Shear bond strength was measured by the universal testing machine. The fracture patterns and the adhesive interface were observed using a stereomicroscope. RESULTS. SEM revealed that the lumens of dentinal tubules were completely occluded by Hybrid Coat. The Hybrid Coat significantly improved the shear bond strength of resin-modified glass ionomer cement (RMGIC) and resin cement (RC) but weakened the performance of zinc phosphate cement (ZPC), zinc polycarboxylate cement (ZPCC) and glass ionomer cement (GIC). CONCLUSION. Hybrid Coat is an effective dentinal tubule sealant, and therefore its combined use with resin or resin-modified glass ionomer cements can be applied for the prostheses attachment purpose.

The Construction of the Animal Husbandry Information System Based on the Technology of Map Conflation

Yue Guo,Zhongbin Su,Weizheng Shen,Zhipeng Guo,Qingming Kong 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.3

The research aims to merge the sections of geographic information distribution of the large-scale farms information monitoring system and the farming enterprises filing system which are under the Animal Husbandry Bureau in Heilongjiang Province as a Geographic Information System (GIS) that based on the map conflation technology of topological relation. Applying a variety of algorithms of points, lines, surfaces to this study, and using optimized "Spider code" and matching algorithm based on area overlay rate to solve the map database conflation problem of two different sources but consistent geographic target. It not only improves the map accuracy and consistency, but also adds new space characteristics, and updates attribute information which associated with dataset spatial characteristics. It makes the personnel at all levels in the Animal Husbandry Bureau in Heilongjiang Province realize information sharing. It is conductive to promote the work of staff at all levels and provide decision support of data to the Animal Husbandry Bureau in Heilongjiang Province.

Synthesis of TiO₂ Nanotubes and Their Sensitivity for Toluene Gas

Yue, H.Y.,Huang, S.,Guo, E.J.,Wang, L.P.,Kang, F.W.,Yu, Z.M.,Guo, Y.K.,Sun, F.L. The Korean Powder Metallurgy Institute 2011 한국분말재료학회지 (KPMI) Vol.18 No.1

$TiO_2$ nanopowders with anatase structure were firstly prepared by controlling the pH value of a precursor solution without any heat-treatment at room temperature. The prepared $TiO_2$ nanopowders were hydrothermally treated in 10M NaOH solution at $170^{\circ}C$. Then, the samples were washed in DI water or 0.1M HCl. The $TiO_2$ nanotubes were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). The gas sensitivity of $TiO_2$ nanotubes for toluene gas was also investigated. The results show that $TiO_2$ nanotubes can be prepared by hydrothermal treatment. The morphology of $TiO_2$ nanotubes prepared by 0.1M HCl washing is destroyed to some extent. $TiO_2$ nanotubes with DI water washing show better sensitivity than that with 0.1M HCl washing.

Preparation and characteristics of carboplatin-Fe@C-loaded chitosan nanoparticles with dual physical drug-loaded mechanisms

Yue-Hua Guo,Fu-Rong Li,Shi-Yun Bao,Tao Han,Jun-Jian Cao,Han-Xin Zhou 한국물리학회 2007 Current Applied Physics Vol.7 No.s1

The present work is intended to set up the optimal carboplatin-Fe@C-loaded chitosan nanoparticles method and to compare andassess carboplatin-Fe@C-loaded with carboplatin-Fe-loaded chitosan nanoparticles. Both kinds of nanoparticles were prepared by areverse microemulsion method. The carboplatin-Fe@C-loaded chitosan nanoparticles consisted of Fe@C nanopowder with the adsorbeddrug as the magnetic core, chitosan as the matrix and carboplatin as the model drug. The core of the carboplatin-Fe-loaded chitosannanoparticles was pure iron nanopowder, which was unable to adsorb a drug. The characteristics of both kinds of nanoparticles weredetermined and compared. The results showed that both kinds of nanoparticles were spherical in shape with an average size of210 nm ± 26 nm (size range 150300 nm) and a good magnetic responsivity. The drug content of the nanoparticles wasrespectively. The cumulative release percentages of carboplatin-Fe@C-loaded chitosan nanoparticles in vitro in 1d, 2d, 3d, 4d were60%, 74%, 84%, and 92%, respectively, and those of carboplatin-Fe-loaded chitosan nanoparticles in 1d, 2d were 81% and 91%. Thus,the carboplatin-Fe@C-loaded chitosan nanoparticles with dual physical drug-loaded mechanisms (physical encapsulation and adsorp-tion of active carbon) possessed a higher drug content and showed more sustained releasing. The cooperation of multiple mechanismswas a promising feature to improve the properties of nanoparticles.

Blue shift behavior of Eu²⁺ emission in eulytite-type Sr₃La(PO₄)₃ phosphor based on the release of adjacent Eu³⁺-induced stress

Guo, Yue,Park, Sung Heum,Choi, Byung Chun,Jeong, Jung Hyun,Kim, Jung Hwan Elsevier 2018 JOURNAL OF ALLOYS AND COMPOUNDS Vol.742 No.-

<P><B>Abstract</B></P> <P>We have synthesized and investigated the eulytite-type single-phased Sr<SUB>3</SUB>La(PO<SUB>4</SUB>)<SUB>3</SUB>:Eu<SUP>2+</SUP>, Eu<SUP>3+</SUP> phosphor. GSAS Rietveld refinement, X-ray diffraction, luminescent spectra, and X-ray photoelectron spectroscopy were applied to investigate the obtained phosphor. Detailed crystal structure analysis confirmed that Eu<SUP>2+</SUP> and Eu<SUP>3+</SUP> activators were able to replace Sr<SUP>2+</SUP> and La<SUP>3+</SUP> sites, respectively. The Eu<SUP>2+</SUP> ions occupied two types of Sr/La luminescent centers exhibited blue and green emissions, while the Eu<SUP>3+</SUP> ions resided one type of Sr/La luminescent centers exhibited typical red emission. It is noteworthy that Eu-activated Sr<SUB>3</SUB>La(PO<SUB>4</SUB>)<SUB>3</SUB> phosphor had a wide absorption band at 250–450 nm, matching well with the commercial UV/near-UV chips. Interestingly, an abnormal blue shift behavior of Eu<SUP>2+</SUP> emission was observed in Sr<SUB>3</SUB>La(PO<SUB>4</SUB>)<SUB>3</SUB>:Eu<SUP>2+</SUP>,Eu<SUP>3+</SUP> system because of the strong covalent character of Eu<SUP>3+</SUP>-O<SUP>2-</SUP> bond and the release of adjacent Eu<SUP>3+</SUP>-induced stress. Therefore, the result suggests that the Eu<SUP>3+</SUP> can affect the performance of Eu<SUP>2+</SUP> ions in this system. In addition, our work can also encourage the study of the complicated luminous behavior among multi-oxidation states in single Wyckoff site with huge potential applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The phosphors is in favor of matching the commercial near-UV chips. </LI> <LI> Eu<SUP>3+</SUP> can affect the performance of Eu<SUP>2+</SUP> in Sr<SUB>3</SUB>La(PO<SUB>4</SUB>)<SUB>3</SUB>:Eu<SUP>2+</SUP>, Eu<SUP>3+</SUP>. </LI> <LI> The complex luminous behavior of multi-oxidation states in a single site. </LI> <LI> White light emission can be obtained from Sr<SUB>3</SUB>La(PO<SUB>4</SUB>)<SUB>3</SUB>:Eu<SUP>2+</SUP>,Eu<SUP>3+</SUP>. </LI> <LI> Blue shift of Eu<SUP>2+</SUP> based on the release of adjacent Eu<SUP>3+</SUP>-induced stress. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Ca₉Na_1/3M_{2(1-<i>x</i>)/3}(PO₄)₇:2<i>x</i>/3Eu³⁺ (M = Gd, Y): A promising red-emitting phosphor without concentration quenching for optical display applications

Guo, Yue,Heum Park, Sung,Kee Moon, Byung,Hyun Jeong, Jung,Hwan Kim, Jung Elsevier 2018 Journal of luminescence Vol.194 No.-

<P><B>Abstract</B></P> <P>Zero-quenching red-emitting phosphors Ca<SUB>9</SUB>Na<SUB>1/3</SUB>M<SUB>2(1-<I>x</I>)/3</SUB>(PO<SUB>4</SUB>)<SUB>7</SUB>:2<I>x</I>/3Eu<SUP>3+</SUP> (M = Gd, Y) were successfully synthesized by solid-state method. The analysis of XRD, SEM, UV–vis DRS, luminescent spectra, and the emission dynamics curves were applied to investigate the obtained powders. These results showed that Eu<SUP>3+</SUP>-activated Ca<SUB>9</SUB>Na<SUB>1/3</SUB>M<SUB>2(1-<I>x</I>)/3</SUB>(PO<SUB>4</SUB>)<SUB>7</SUB> (M = Gd, Y) phosphors can absorb the wavelength from 220 to 480nm, which is matched well with commercial near-UV chips, and emit intense red light without concentration quenching. Notably, the integral intensities calculated from Ca<SUB>9</SUB>Na<SUB>1/3</SUB>Gd<SUB>2(1-<I>x</I>)/3</SUB>(PO<SUB>4</SUB>)<SUB>7</SUB>:2<I>x</I>/3 Eu<SUP>3+</SUP> and Ca<SUB>9</SUB>Na<SUB>1/3</SUB>Y<SUB>2(1-<I>x</I>)/3</SUB>(PO<SUB>4</SUB>)<SUB>7</SUB>:2<I>x</I>/3Eu<SUP>3+</SUP> phosphors were about 3.05 and 2.64 times higher than that of commercial phosphor Y<SUB>2</SUB>O<SUB>3</SUB>:Eu<SUP>3+</SUP>, respectively. In addition, the CIE color coordinate was calculated to be (0.65, 0.34). It should be pointed out that the FWHM of <SUP>5</SUP>D<SUB>0</SUB>→<SUP>7</SUP>F<SUB>2</SUB> transition band was greatly expanded due to the presence of multi-sites for Eu<SUP>3+</SUP> ions in the hosts. These results suggest that the obtained phosphors have the potential for lighting and optical display applications.</P>

Clinical activity of Occupational Medicine in Taiwan

Yue Leon Guo 대한직업환경의학회 2009 대한직업환경의학회 학술대회 논문집 Vol.43 No.-

Color–tunable luminescence and energy transfer behaviors of Dy³⁺/Eu³⁺ co–doped SrLaMgTaO₆ phosphors for solid state lighting applications

Guo, Yue,Moon, Byung Kee,Choi, Byung Chun,Jeong, Jung Hyun,Kim, Jung Hwan Elsevier 2017 Materials research bulletin Vol.88 No.-

<P><B>Abstract</B></P> <P>A series of color–tunable SrLa<SUB>0.93-y</SUB>MgTaO<SUB>6</SUB>:0.07Dy<SUP>3+</SUP>, yEu<SUP>3+</SUP> phosphors were synthesized via solid–state reaction. The X–ray diffraction, diffuse reflectance spectra, luminescent spectra, lifetimes and thermal quenching were applied to characterize the obtained phosphors. The X–ray diffraction results revealed that the obtained phosphors possessed pure monoclinic phase. The band gap of SrLaMgTaO<SUB>6</SUB> was calculated from Vienna ab initio simulation package and diffuse reflectance spectra. The energy transfers from host to Dy<SUP>3+</SUP> and Eu<SUP>3+</SUP> ions were confirmed by the luminescence spectra. Furthermore, the SrLa<SUB>0.92</SUB>MgTaO<SUB>6</SUB>: 0.07Dy<SUP>3+</SUP>, 0.01Eu<SUP>3+</SUP> phosphor had excellent thermal stability, while the integrated PL intensity still kept about 83.34% at 150°C of that measured at room temperature (30°C). In addition, the warm and cold white light emission could be generated with different Eu<SUP>3+</SUP> contents. All the results of SrLa<SUB>0.93-y</SUB>MgTaO<SUB>6</SUB>:0.07Dy<SUP>3+</SUP>, yEu<SUP>3+</SUP> phosphors show great potential as a single–phase white–emitting phosphor for solid state lighting applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Excited by 354nm, the samples showed TaO<SUB>6</SUB> group, Dy<SUP>3+</SUP> and Eu<SUP>3+</SUP> ions emission. </LI> <LI> The band gap was calculated by VASP and diffuse reflectance spectra. </LI> <LI> The ET mechanism from Dy<SUP>3+</SUP> to Eu<SUP>3+</SUP> ions are the exchange interaction. </LI> <LI> The integral intensity kept about 83.34% at 150°C of that measured at 30°C. </LI> <LI> The warm and cold white light emission could be generated. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Elaboration, Structure and Luminescence of Sphere-Like CaF₂:RE Sub-Microparticles by Ionic Liquids Based Hydrothermal Process

Guo, Hai,Guo, Yue,Noh, Hyeon Mi,Moon, Byung Kee,Park, Sung Heum,Jeong, Jung Hyun,Kim, Kwang Ho American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.1

<P>A new and simple method for the synthesis of rare earth ion doped CaF2 (CaF2:RE3+) sub-microparticles is presented, using an ionic liquids based hydrothermal process. The structural properties of the CaF2 nanoparticles were investigated using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). The CaF2 nanoparticles exhibited a sphere-like morphology with a diameter of about 150 nm. During the synthesis, the ionic liquid [bmim]BF4 (1-butyl, 2-methylimidazolium tetrafluoroborate) acts as both a co-solvent and reactant. The crucial effect of EDTA-2Na (ethylene diamine tetra acetic acid disodium salt) on the formation of CaF2:RE sub-microparticles was explored and discussed. The strong green (513-569 nm) and strong red (636-685 nm) upconversion emissions of the CaF2:Er3+,Yb3+ nanoparticles (lambda(ex) = 980 nm) were also investigated. The luminescent properties of CaF2:Eu3+ and CaF2:Ce3+,Tb3+ were also evaluated. This work may represent a new step in synthesizing fluoride sub-nanocrystals using ionic liquids.</P>

Effect of La³⁺ ion doping on the performance of Eu²⁺ ions in novel Sr₃CeNa(PO₄)₂SiO₄ phosphors

Guo, Yue,Park, Sung Heum,Choi, Byung Chun,Jeong, Jung Hyun,Kim, Jung Hwan Elsevier 2017 Journal of alloys and compounds Vol.724 No.-

<P><B>Abstract</B></P> <P>We synthesized and investigated the effect of La<SUP>3+</SUP> ion doping in a novel phosphor-silicate apatite Sr<SUB>2.99</SUB>CeNa(PO<SUB>4</SUB>)<SUB>2</SUB>SiO<SUB>4</SUB>:0.01Eu<SUP>2+</SUP> phosphor. X-ray diffraction, GSAS Rietveld refinement, X-ray photoelectron spectroscopy, luminescent spectra, decay curves, and thermal quenching were applied to investigate the phase, structure, luminescence, and thermal stability properties of the obtained phosphor. It is noteworthy that the Eu<SUP>2+</SUP>-activated Sr<SUB>3</SUB>CeNa(PO<SUB>4</SUB>)<SUB>2</SUB>SiO<SUB>4</SUB> phosphor can match well with commercial near-UV chips, suggesting its promising application in phosphor-converted white LEDs. Interestingly, by incorporating La<SUP>3+</SUP> ions in Sr<SUB>2.99</SUB>CeNa(PO<SUB>4</SUB>)<SUB>2</SUB>SiO<SUB>4</SUB>: 0.01Eu<SUP>2+</SUP>, the regulation of Eu<SUP>2+</SUP> luminescence intensities in two centers was achieved via two methods: one is to increase the La<SUP>3+</SUP> concentration from 0 to 0.9 mol and the other is to adjust the excitation wavelength from 300 to 390 nm. More specifically, the luminescence dynamic process and internal quantum efficiency were also changed by La<SUP>3+</SUP> ion doping in Sr<SUB>2.99</SUB>CeNa(PO<SUB>4</SUB>)<SUB>2</SUB>SiO<SUB>4</SUB>:0.01Eu<SUP>2+</SUP>. Therefore, these phenomena illustrate that incorporating La<SUP>3+</SUP> ions in Sr<SUB>2.99</SUB>CeNa(PO<SUB>4</SUB>)<SUB>2</SUB>SiO<SUB>4</SUB>: 0.01Eu<SUP>2+</SUP> can affect the performance and characteristics of Eu<SUP>2+</SUP> ions. Furthermore, our work also encourages research on the luminous effect of site occupancy and the local environment of luminescence centers.</P> <P><B>Highlights</B></P> <P> <UL> <LI> By doping La<SUP>3+</SUP>, the performance and characteristics of Eu<SUP>2+</SUP> were changed. </LI> <LI> The internal quantum efficiency of SCNPS:0.01Eu<SUP>2+</SUP>,0.1La<SUP>3+</SUP> is 64.82%. </LI> <LI> These solid solutions can be properly excited by UV/near–UV LED chip. </LI> <LI> Two methods of adjusting Eu<SUP>2+</SUP> luminescence in two centers. </LI> <LI> Energy transfer from host (Ce<SUP>3+</SUP> ions) to two kinds of Eu<SUP>2+</SUP> ions. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>