JOURNAL OF PROSTHETIC DENTISTRY
·
2023
·
IF 4.6
Yaoxin Wang,Zijing Chang,Ning Ding,Zutai Zhang
Statement of problem Secondary caries is a major factor in the failure of dental restorations . However, studies on the fabrication of acid-resistant and antibacterial dentin to improve dentin bonding are sparse. Purpose The purpose of this in vitro study was to compare the effects of 2 types of fluoride-containing etchants on dentin bonding and explore the feasibility of formulating an altered dentin substrate to improve dentin bonding. Material and methods NaF-containing and SnF 2 -containing etchants were developed by adding sodium fluoride and stannous fluoride to a 35% phosphoric acid aqueous solution. Two groups (N1 and N2) containing NaF, 10 and 30 mg/mL respectively, and 2 groups (S1 and S2) containing SnF 2, 18.6 and 55.8 mg/mL respectively, were formulated. The etchant of the control group (C) was 35% phosphoric acid gel. Scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), Fourier transform infrared spectroscopy (FTIR), microhardness, antierosion, and antibacterial tests were performed on the treated dentin. Moreover, the microtensile bond strength (µTBS) of each group was tested, and the fracture mode was determined after testing. Statistical analysis was performed with the 2-way ANOVA test (α=.05). Results The exposed collagen fiber was observed in group C, and minerals were formed on the dentin in the experimental groups. SEM, FTIR, and the microhardness test indicated more remineralization in the SnF 2 -containing etchant groups. The µTBS of S1 (77.5 ±10.36 MPa) was the highest in all groups, and group C (38.5 ±9.01 MPa) was the lowest. Moreover, the antierosion and antibacterial properties of the S2 group were the best among all groups ( P <.05). Conclusions Compared with NaF-containing etchant, SnF 2 -containing etchant could improve the dentin substrate, increase remineralization, improve bonding strength, and enhance antibacterial ability, especially by increasing resistance to acid erosion.
研究领域:
牙科学
·
材料科学
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
SYNTHESIS-STUTTGART
·
2024
·
IF 2.2
Taijie Guo,Wei Wang,Long Xu,Jiajia Dong
Here we report the utilization of NH-sulfamoyl fluorides (RNHSO2F) as reliable SuFEx synthons for the construction of various sulfamate esters. By using potassium fluoride as base, we are able to convert RNHSO2F to azasulfene intermediates under mild conditions and guarantee their further efficent ligation with phenols and alcohols.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2020
·
IF 9.567
Minqiang Gai,Tinghao Tong,Ying Wang,Zhihua Yang,Shilie Pan
By the selective fluorination of IO4 in iodates, SrI2O5F2 (SIOF) and Ba(IO2F2)2 (BIOF) were synthesized successfully. They are the first reported cases of alkaline-earth metal fluoroiodates, and the (IO3F)2– units in SIOF were discovered for the first time to the best of our knowledge. BIOF possesses the shortest UV cutoff edge (230 nm), and SIOF has the largest birefringence (cal. 0.203 at 532 nm) among the reported fluoroiodates. The highly polarizable (IO3F)2–, with high polarizability anisotropy, induces a large birefringence in SIOF by theoretical calculation. This work will contribute to enlarge the structural diversity and provide a good choice for the material design in fluoroiodates.
研究领域:
无机化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Runfa Liu,Yue Pan,Jia Zhang,Xincui Zhuang,Yangbo Wang,Xufeng Zhou,Shanshan Du,Huaiyong Li,Wei Li
Ratiometric luminescence thermometry is awfully applicable for non-contact temperature detection. Lanthanide luminescent materials available for high-performance ratiometric thermometry are still highly desirable until now. Herein, two novel upconversion phosphors, Yb 3+ /Ho 3+ co-doped BiOF and BiF 3 microcrystals , were synthesized and investigated systematically in terms of their crystalline structure, room temperature and temperature-dependent upconversion properties. Under 980 nm laser excitation, both microcrystals bring forth the characteristic emissions of Ho 3+ , with an identical overall luminescent color of green, while the intensity is much higher in BiF 3 :Yb/Ho microcrystals. When increasing temperature, the upconversion intensity at various wavelengths for both microcrystals is reduced, meanwhile fluorescence intensity ratios of both 545/656 nm and 752/656 nm decrease highly regularly, establishing a ratiometric thermometry therefore. BiF 3 :Yb/Ho microcrystals were demonstrated to have significantly superior thermometric performance than BiOF:Yb/Ho, and a high relative sensitivity up to 5.41% K −1 as well as a wide temperature sensing range of 298–673 K were obtained.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Liqin Yao,Shengan He,Wendong Nie,Lei Fu,Zhijian Liao,Wenting Cai,Ruixiang Wang,Jiaqing Peng,Xinyu Ye
Mn 4+ -activated (oxy)fluoride-based red phosphors have received extensive attention. In this work, a phase transformation from K 2 NbF 7 to K 3 HF 2 NbOF 5 was successfully achieved by stoichiometric control during coprecipitation process, resulting in a novel red phosphor K 3 HF 2 NbOF 5 :Mn 4+ with narrow-band emission. A systematic study was carried out on its crystal structure and luminescent properties. By introducing O ions into the local coordinated structure, the emission intensity of K 3 HF 2 NbOF 5 :Mn 4+ phosphors is 2.15 times as high as that of K 2 NbF 7 :Mn 4+ with a photoluminescence internal quantum yield (IQE) of 73.28% and absorption efficiency (AE) of 49.68%, which could be attributed to the layered structure of the oxyfluoride host. High quenching concentration of 8.39 mol% and short decay lifetime of 4.19 ms are realized. Based on K 3 HF 2 NbOF 5 :Mn 4+ and commercial YAG:Ce 3+ , a white light-emitting diode (WLED) for solid state lighting was fabricated, which has low CCT of 3802 K, high Ra of 86.3 and high luminous efficiency (LE) of 126.23 lm/W. Moreover, by employing commercial β-sialon:Eu 2+ and K 3 HF 2 NbOF 5 :8.39%Mn 4+ , another WLED with high LE of 95.78 lm/W and wide color gamut of 108.6% National Television Standard Committee (NTSC) standard for backlight lighting was packaged, indicating a great potential of K 3 HF 2 NbOF 5 :Mn 4+ as a red component in the application of backlight lighting.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Mengting Wang,Han Ye,Xiongkai Zheng,Siyuan Chen,Huanhuan Xing,Xueqin Tao,Zhi Dang,Guining Lu
Cadmium (Cd 2+ ) and fluoride (F - ) are frequently detected simultaneously in wastewater. Simultaneous removal of Cd 2+ and F - in wastewater is urgent. In this study, bovine bone meal (BBM), mainly consisted of hydroxyapatite , was used as a green adsorbent for Cd 2+ and F - adsorption in single and binary solutions. The results showed that with the increase of pH, the uptake ability of BBM towards Cd 2+ and F - showed an upward and downward trend, respectively, suggesting that electrostatic interaction was an important mechanism. Cl - and NO 3 - had little effect on Cd 2+ and F - adsorption, while H 2 PO 4 - enhanced adsorption capacities. The kinetic data of Cd 2+ and F - removal were successfully described by pseudo-second order model. The maximum adsorption capacity (q m ) of Cd 2+ obtained from the Langmuir model was 78.969 mg/g. The adsorption isotherm of F - was consistent with S-type and satisfied with the Brunauer, Emmett, and Teller (BET) model. In the binary system, F - slightly decreased the adsorption capacity of BBM on Cd 2+ , while Cd 2+ increased the adsorption capacity of BBM on high-concentration F - from 38.724 to 86.966 mg/g. This study provides a cost-effective and environmentally friendly method for separate and simultaneous removals of Cd 2+ and F - from water, which provides a practicable way for the treatment of cadmium-fluorine wastewater and resource utilization of bovine bone.
研究领域:
环境科学
·
废水处理
✓ 已验证
产品关联
DOI
高影响因子
JOM
·
2019
·Vol. 72
·期 1
·239-246
·
IF 2.305
Peng Jianping,Wei Zheng,Di Yuezhong,Wang Yaowu,Sun Ting
NaF-KF-LiF-AlF 3 -based low-temperature electrolytes have attracted great interest because of their potential to optimize and improve current industrial aluminum production methods. In the present study, the saturated alumina solubility in quaternary NaF-KF-LiF-AlF 3 -based melts (total cryolite molar ratio \( {\text{CR}} = \left( {n_{\text{NaF}} + n_{\text{KF}} + n_{\text{LiF}} } \right)/n_{{{\text{AlF}}_{3} }} \) of 1.3) with both KF and LiF content of 0 mol.% to 20 mol.% were evaluated by measuring the weight loss of a rotating corundum disk over the temperature range of 800–920°C. The effects of the KF content, LiF content, and temperature on alumina solubility are discussed in detail. The results fit well with the following empirical equation within the temperature of 830–890°C: ω (Al 2 O 3 ) sat = A × ( t /1000) B , where A = 0.3101[KF] − 0.1254[LiF] − 0.0057[KF] 2 + 0.0028[LiF] 2 + 4.486, B = 0.3839[KF] + 0.0368[LiF] − 0.0140[KF] 2 + 0.0057[LiF] 2 + 4.913, and t is the temperature in Celsius. Alumina solubility diagrams at various temperatures are illustrated based on the empirical regression equation obtained. Finally, some problems and challenges preventing the application of these low-temperature melts in industry are discussed.
研究领域:
冶金学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 3
·1658-1665
·
IF 3.119
Pengfei Shuai,Dan Yang,Libing Liao,Qingfeng Guo,Lefu Mei,Yidi Zhang,Haikun Liu
Cryolite is a suitable host for up-conversion luminescent materials due to its low phonon energy and good optical transparency. In this work, a novel up-conversion material K3YF6:Yb3+, Er3+ with a cryolite structure was prepared successfully by a solid state method. The crystal structure, morphology, composition and up-conversion luminescence properties of the as-prepared sample were characterized by X-ray diffractometry (XRD), field emission scanning electron microscopy (SEM) and fluorescence spectrometer in detail. K3YF6:Er3+, Yb3+ has a cryolite structure. Under 980 nm excitation, the as-prepared sample can generate slight green emission at 524 and 546 nm (attributed to 2H11/2 → 4I15/2 transition, 4S3/2→4I15/2 transition of Er3+) and strong red emission at 661 and 672 nm (corresponding to 4F9/2 → 4I15/2 transition, 4I9/2 → 4I15/2 transition of Er3+). All the green and red up-conversion emission of K3YF6:Er3+, Yb3+ transfer and electronic transition process of the red and green light the sample emitted, the possible luminescence mechanism is discussed in this paper.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
DESALINATION
·
2024
·
IF 8.3
Lei Huang,Lei Sheng,Kuilin Wan,Meicong Wang,Hongguo Zhang,Jia Yan,Yonghui Liu,Sikpaam Issaka Alhassan,Yongsheng Chen,Samuel Raj Babu Arulmani
Fluoride is a common pollutant from nature, normal life, and production. Adsorption, electro-adsorption, and precipitation are dominant mechanisms corresponding to the adsorption and electro-adsorption technologies for removing fluoride. This paper presents Ti 3 AlC 2 as an effective reagent for removing fluoride under acidic conditions. The adsorption mechanisms of adsorption and electro-adsorption were compared to sedimentation at pH 2 and 1, leading to a higher removal rate of adsorption by pH 2 than at pH 1. The adsorptive behavior of Ti 3 AlC 2 with fluoride includes both multilayer sorption and chemisorption. Furthermore, the precipitation reaction induced a partial change of Ti 3 AlC 2 to MXene. Notably, electro-adsorption was more effective rather than sedimentation at pH 1 in capacitive deionization technology. The Al adsorption sites made it easier to combine fluoride than Ti, and aluminum fluoride was easier to produce than titanium (III) fluoride. These adsorption and electro-adsorption experiments were carried out to elucidate and delineate the performance of Ti 3 AlC 2 for removing fluoride. A molecular model of Ti 3 AlC 2 was also built to calculate adsorption using the density functional theory. Hence, the Ti 3 AlC 2 molecular model combined with XPS and other characterizations of materials provided an effective, easy-to-understand combinative mechanism for removing fluoride.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
INORGANICA CHIMICA ACTA
·
2023
·
IF 2.8
Yanhui Zhang,Yun Yang,Xifa Long,Hualing Tian,Xiaofeng Gu,Zhi Su
A new alkali/alkali-earth metal pyrophosphate fluoride Na 2 Mg 2 P 2 O 7 F 2 without the structural disorder in the cuspidine family has been successfully prepared in the sealed system. Na 2 Mg 2 P 2 O 7 F 2 crystallizes in the space group P 2 1 / c (No. 14) of the monoclinic crystal system . The structure of Na 2 Mg 2 P 2 O 7 F 2 is shown to be an intricate three-dimensional (3D) framework that consists of the 2D layers [Mg 4 O 12 F 2 ] ∞ and the 1D chain [Na 2 O 8 F 3 ] ∞ interlinked by isolated P 2 O 7 groups, which demonstrates the precise coordination environment of cations and the framework in inorganic alkali/alkaline earth metal pyrophosphate fluoride. By comparing with other phosphate structures, we found that the introduction of F is conducive to the consistent arrangement of anionic group P 2 O 7 and enriches the diversity of cationic polyhedra. In addition, first-principle theoretical studies were also carried out to aid the understanding of microstructures, and Na 2 Mg 2 P 2 O 7 F 2 possesses a large band gap (7.1 eV) and has potential applications in the deep ultraviolet region.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2023
·Vol. 11
·期 1
·172-185
·
IF 7
Kejie Li,Mengmeng Dai,Zuoling Fu,Zhiying Wang,Hanyu Xu,Rong Wang
Fluorides have garnered tremendous attention in rare-earth-doped fluorescent probes owing to their low phonon energy and excellent optical transparency. However, the latest generation of fluorides, LiYF4, is plagued by extremely complex and uncontrollable synthesis methods, which greatly restricts its further exploration and application. Herein, a straightforward one-step method for the synthesis LiYF4:Ln3+ with micron-sized cones and nano-spheres is reported. Astonishingly, self-sensitized luminescence was achieved under multi-wavelength excitation when Er3+ was singly doped. LiYF4:Yb3+,Er3+ demonstrated superior luminescence intensity to those of commercial green phosphors (NaYF4:Yb3+,Er3+); this ultra-efficient photoluminescence was confirmed from the crystal structure, electronic band properties, morphological analysis and Debye temperature calculations. Further, by constructing cross-relaxation between the Ce3+ and Er3+ ions (4I11/2 + 2F5/2 → 4I13/2 + 2F7/2), the specific four-peak emission (SFPE) intensity of Er3+ in NIR-IIb was significantly increased, further enhancing the relative sensitivity of thermally coupled temperature sensing based on SFPE. Subsequently, non-thermally coupled temperature sensing based on SFPE was also achieved through the construction of phonon-assisted energy transfer between Ho3+ 5I6 and Er3+ 4I13/2. In summary, this paper not only puts forward theoretical and experimental arguments for the use of LiYF4 to replace the conventional NaYF4, but also substantiates the extraordinary prospects of LiYF4 as a temperature-sensitive fluorescent probe in nanomedicine.
研究领域:
材料科学
·
纳米医学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Yitong Guo,Sen Jin,Libo Wang,Pingge He,Qianku Hu,Li-Zhen Fan,Aiguo Zhou
In this study, highly pure Mo 2 CT x MXene was successfully synthesized from Mo 2 Ga 2 C by etching in hydrothermal conditions for 24 h at 140–180°C. The etching solutions were lithium fluoride (LiF), sodium fluoride (NaF), potassium fluoride (KF) or ammonium fluoride (NH 4 F) mixed with hydrochloric acid (HCl). The temperature to obtain pure Mo 2 CT x MXene in NH 4 F + HCl solution was 140°C, lower than that in other etching solutions. The thickness of as-prepared monolayer Mo 2 CT x nanosheet was measured to be 1.5 ± 0.3 nm by atomic force microscope. From thermogravimetry and differential thermal analysis, Mo 2 CT x MXene was found to be stable in argon atmosphere at a temperature of up to 500°C. As the temperature increased, Mo 2 CT x MXene gradually transformed, and β-Mo 2 C/MoC/Mo 3 C 2 was eventually formed to coexist with Mo 2 CT x MXene at 700°C. In air atmosphere, Mo 2 CT x MXene was stable at 200°C. At 590°C, Mo 2 CT x MXene was completely oxidized to MoO 3 .
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）