Academic literature on the topic 'Mesoporous silica sphere'
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Journal articles on the topic "Mesoporous silica sphere"
Jung, Eun Jin, Yoon Joo Lee, Woo Teck Kwon, Y. Kim, Dong Geun Shin, and Soo Ryong Kim. "The Synthesis of High-Surface Area Silicon Carbide by Conversion Method Using Carbosilane Polymer." Defect and Diffusion Forum 353 (May 2014): 244–47. http://dx.doi.org/10.4028/www.scientific.net/ddf.353.244.
Full textLee, Dong-Wook, Son-Ki Ihm, and Kew-Ho Lee. "Mesoporous silica framed by sphere-shaped silica nanoparticles." Microporous and Mesoporous Materials 83, no. 1-3 (September 2005): 262–68. http://dx.doi.org/10.1016/j.micromeso.2005.05.004.
Full textDas, D. P., K. M. Parida, and B. K. Mishra. "Synthesis and Surface Properties of Silica Spheres with Core Shell Structure by One Convenient Method." Research Letters in Materials Science 2009 (2009): 1–5. http://dx.doi.org/10.1155/2009/328508.
Full textGao, Qiang, Zong Wei Chen, Jun Xu, and Yao Xu. "pH-Controlled Drug Release from Mesoporous Silica Spheres with Switchable Gates." Advanced Materials Research 236-238 (May 2011): 2142–45. http://dx.doi.org/10.4028/www.scientific.net/amr.236-238.2142.
Full textMou, Chung-Yuan, and Hong-Ping Lin. "Control of morphology in synthesizing mesoporous silica." Pure and Applied Chemistry 72, no. 1-2 (January 1, 2000): 137–46. http://dx.doi.org/10.1351/pac200072010137.
Full textXiong, Chengjia, Jiupeng Zhao, Lebin Wang, Hongbin Geng, Hongbo Xu, and Yao Li. "Trace detection of homologues and isomers based on hollow mesoporous silica sphere photonic crystals." Materials Horizons 4, no. 5 (2017): 862–68. http://dx.doi.org/10.1039/c7mh00447h.
Full textZheng, Xiao-Yu, Juan Pellico, Alexandr A. Khrapitchev, Nicola R. Sibson, and Jason J. Davis. "Dy-DOTA integrated mesoporous silica nanoparticles as promising ultrahigh field magnetic resonance imaging contrast agents." Nanoscale 10, no. 45 (2018): 21041–45. http://dx.doi.org/10.1039/c8nr07198e.
Full textSakamoto, Yasuhiro, Osamu Terasaki, Hiromitsu Furukawa, and Miyoko Shimizu. "3D Reconstruction of Silica Mesoporous Sphere using Electron Tomography." Materia Japan 46, no. 12 (2007): 797. http://dx.doi.org/10.2320/materia.46.797.
Full textRoque-Malherbe, Rolando, and Francisco Marquez. "Synthesis and characterization of silica sphere-packing mesoporous materials." Surface and Interface Analysis 37, no. 4 (2005): 393–97. http://dx.doi.org/10.1002/sia.2011.
Full textHao, Nanjing, Xuan Chen, Kalana W. Jayawardana, Bin Wu, Madanodaya Sundhoro, and Mingdi Yan. "Shape control of mesoporous silica nanomaterials templated with dual cationic surfactants and their antibacterial activities." Biomaterials Science 4, no. 1 (2016): 87–91. http://dx.doi.org/10.1039/c5bm00197h.
Full textDissertations / Theses on the topic "Mesoporous silica sphere"
Nyalosaso, Likoko Jeff. "Synthèse et caractérisation de sphères monodisperses de silice à porosité radiale (multi)fonctionnelles et étude de leur performance en catalyse en phase liquide et en vectorisation de principes actifs." Thesis, Montpellier 2, 2011. http://www.theses.fr/2011MON20218.
Full textA novel approach of synthesis has been developed in order to control simultaneously the morphology, size and textural parameters of silica particles, as well as to incorporate one or more functional groups in the pore walls. In this approach, based on the modified Stöber method and in-situ functionalization, emphasis is put on the spherical morphology, the particle monodispersity, the radially disposed porous structure, and the appropriate dispersion and accessibility of surface functional groups. Two potential applications have been selected so as to verify the feasibility of the approach. In view of materials use for heterogenous catalysis in the liquid phase, the monodisperses mesoporous silica spheres were derivatized with metallic species (e.g., Al and Cu) by direct incorporation in the synthesis stage. The second type of applications concerned the use of silica spheres as sensitive nanomachines for the controlled drug release and required grafting of appropriate organic molecules onto the silica surface
Chen, Chau-Nan, and 陳朝楠. "Synthesis of uniform mesoporous silica sphere." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/dgrf8v.
Full text國立成功大學
化學系碩博士班
92
On the bases of theory of self-assemble chemistry, we proposed new chemical compositions to synthesize the uniform mesoporous silica spheres with different diameters using alkyltrimethylammonium surfactant as structure-directing agent and sodium silicate as silica source in neutral condition (pH=7.0-9.0). In order to simulate opal with photonic crystal structure in nature, our mesoporous silica spheres must have high uniformity (< 10%) and nice order packing. The diameters of the mesoporous silica spheres can be controlled with pH value and the amount of cosolvent, and we can gain opaline flake from suitable centrifugation. However, the color of the opaline flake varies with particle sizes. The bigger particle sizes (160-180 nm) show light blue color, and the smaller ones (< 100 nm) show transparence. Besides, we also confer the effect of size and concentration of inorganic silicate precursor. The vesicle-like mesoporous silica has been synthesized using block copolymer as surfactant and sodium silicate as silica source at pH value around 5.0. The effect of silica concentration on the mesostructure was discussed. Moreover, the vesicle-like mesoporous silica with high porosity was used as a template to prepare mesocarbon of high surface area, and porosity. Based on the concepts of coprecipitation, we successfully incorporate titanium and zirconium oxide into mesoporous silica framework. Finally, we use titanium oxide incorporated mesoporous silica as solar catalyst to convert NO into NO3-, and its conversion is up to 60%.
Li-MingChen and 陳立敏. "Using Surface-Activation and Hard-Templating Methods to Prepare CNT@ or Silica Sphere@Mesoporous Silica, Mesoporous Zeolite and Mesoporous Carbon and Metal Oxide Hollow Spheres." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/67671370026638677935.
Full text國立成功大學
化學系碩博士班
100
Mesoporous silicas and carbons with high surface area, large porosity, high thermal stability, are of the great interest of its extensive applications, such as catalyst, adsorbents, hard templates and electrode materials. In this research, gelatin was used as surface-activation agent and silica sphere (SS) synthesized using Stöber method and carbon nanotubes (CNT) was used as hard-template to prepare silica sphere@ or CNT@mesoporous silica composites. Combining with impregnation or steaming methods, mesoporous carbon and metal oxides hollow spheres were conveniently synthesized using silica sphere@mesoporous silicas as hard template. In the first part of this thesis, we focused on selection of surface activation agent to induce silicate/surfactant assembly and condensation on the surface of silica sphere. After the pre-products was carried out in a PP bottle at 100℃ for 24 h, the well-dispersed SS@MS with core-shell structure was prepared. Using the SS@MS as hard temple, the mono-dispersed hollow carbon sphere can be obtained from impregnation of phenol-formaldehyde resin, high-temperature pyrolysis and silica removal by 5% HF etching. Finally, using the hollow carbon sphere as hard temple again, the metal oxide hollow spheres can also be prepared by impregnating a proper amount of the precursor metal ion, high-temperature calcination. The results show that thermally stable aluminum oxide replicate the hollow sphere, but zirconia oxide with a less thermal stability show the fragments of the hollow spheres. The second part of this thesis will demonstrate the preparation of CNTs@mesoporous silica. Using the similar synthetic procedures and compositions, the CNTs@mesoporous silica was obtained from a simple mixing of the CNT-gelatin solution and a sodium silicate solution at pH of 4.0, hydrothermal treatment, and 450oC-calcination to remove the gelatin. A versatile mesoporous silica shell have been thoroughly coated onto the surface of CNTs. Due to the polar mesoporous silica shell, the CNTs@mesoporous silica can be easily dispersed into an epoxy matrix. The mesopores structure of silica layer provides multi-functions on tuning modulus matching, improving interaction and disperse-ability between epoxy and CNTs. The epoxy/CNTs@SiO2 composites showed a superior effect on thermal conductivity than epoxy/CNTs. In addition, the preparation of CNT mesoporous carbon composites, using the CNT@mesoporous silica as hard temple, and impregnating with a carbon precursor followed by carbonization and the use HF for etching the silica shell. Through CV analysis, CNT@MC composite materials had better capacitive performance than commercial active carbon, and capacitive retention maintain near 80% at high scan rate, In the future, these materials have opportunity to replace conventional capacitors as energy storage device. In order to reduce the diffusion path length of the microporous zeolite, introducing the intracrystal mesopores is practicable. Because of high thermal stability of the CNT, the mesoporous ZSM-5 can be obtained from a steaming and calcination on the CNTs@MS composites. In addition to using CNTs@MS composites, other carbon/silica composites, such as cracked rice husk and PF/silica, can also be used to prepare the mesoporous zeolite. The results show that crystals size of zeolite synthesized with CNT@MS and cracked rice husk are large than that with cracked PF/silica. Mesoporous zeolite of high surface area and porosity would offer the possibility for improving catalytic performance.
Liou, Jia-Shin, and 柳佳欣. "Effect of Anion on the Formation of Mesoporous Silica and Synthesis of Metal Modified Hollow Silica Sphere." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/74201315505056095785.
Full text國立臺灣大學
化學研究所
98
Using amphiphilic triblock copolymers [poly (methyl acrylate)-b- (ethylene oxide)-b- (methyl acrylate)] as templates, we have investigated the anion effect toward the porosity of mesoporous silicas. Under high concentration of potassium salts, pore diameters of the obtained silicas increases in the following order: no salt added < KNO3 < KBr < KCl. However, different hysteresis loops of the nitrogen adsorption diagrams were observed when adopting the low concentration of these salts. Different morphology of mesoporous silica with high loading of transition metal ions can be achieved by the co-condensation method. A simple co-condensation of iron(III) acetylacetone, 3-aminopropyltrimethoxysilane, and TEOS in the presence of triblock copolymers provided the mesoporous silicas in hollow spheres (MSHs) with the diameters in the range of 100-400nm, possessing uniform shell with the thickness of 35-40nm. After removal of the surfactants, iron oxide nano-particles (< 5 nm) were well-dispersed on the surface of meso-channels. Even for the higher concentration of metal ions used, the pore channels remain unblocked. The BET surface area was about 378 m2/g and the pore volume was 0.450 cm3/g.
Shu-NingYang and 楊書寧. "The correlation between the scattering mechanism of mesoporous silica hollow sphere in LCs and temperature." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/qnwq8m.
Full text國立成功大學
物理學系
104
Mesoporous silica hollow spheres (MPSHSs) doped in liquid crystals (MPSHSs-LCs) exhibits no aggregation and well-dispersed phenomenon, which reveals some new physics among MPSHSs and LCs. There should be different type of anchoring originated from the surface structure of MPSHSs. In order to realize the phenomenon, we perform the scattering measurement of MPSHSs-LCs with varied temperature to study the correlation between scattering domain and environment temperature, and discuss the dependence of the MPSHS concentration. Besides, dielectric measurement also performed to assist the study the phase transition during the temperature variation, especially in the temperature of phase transition. The real part and the image part of dielectrics result reflect the corresponding relaxation frequency of LCs and isotropic state, respectively. Polymer-dispersed in LCs (PDLCs), chiral LCs (CLCs) and solid silica spheres (SSSs) doped in LCs were also adopted in this work for comparison. We also use the mean field theory to explain our experimental results. The assumption of anisotropic anchoring in the mean field theory can well explain the relation between Tni (nematic-isotropic transition temperature) and the size and concentration of MPSHSs. MPSHS with small size has larger curvature and lead anchoring from the pores of MPSHSs to be strong and random. Thus, larger affected area around MPSHSs is formed at the case of small MPSHSs. We also find the similar behavior in DCS experiments by scattering experiment. A dip appears in the scattering experiment with scan temperature. An opaque state exists on the period of nematic-isotropic transition, which is a transparent nematic state in DSC experiment. In the case of MPSHSs, the dip is quite small and is suppressed as the disorder state overcome the transparent nematic state at larger size or higher concentration. By using two series experiments with different kind of LC scattering devices, the correlation with MSPHS and scattering were confirmed.
Ruo-TongGu and 顧若桐. "The novel behavior of mesoporous silica hollow sphere in nematic liquid crystals and its application." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/3tuw3m.
Full textHung-RuHuang and 黃弘儒. "The scattering mechanism of Mesoporous silica hollow sphere and the development of new type smart window." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/46516082136930599517.
Full text國立成功大學
物理學系
103
Over the past several years of research liquid crystals (LCs), the most fascinating field is that the anisotropic characteristic, indicating the perpendicular direction of dielectric constant or refractive index is different from the direction of parallel. Due to the intrinsic anisotropic characteristic, the application of liquid crystal in the display field is attracting researchers and the display industry. However, the behavior of innate anisotropic fluid, such as nanoparticles or colloidal particles is hard to well disperse in LCs. As the restored elastic continuum of LCs and generated topological defects, the doped nanoparticles couldn’t uniformly disperse in LCs and will gradually aggregate with the time or applied voltage. However, Mesoporous silica hollow sphere (MPSHS) is a candidate artificial material to solve particles aggregation in LCs and also make the controllable scattering effect for further application. The subject of this thesis is to study the scattering phenomenon of MPSHSs and make a better performance of scattering devices, such as smart window. MPSHS-LCs exhibit uniform opaque in the naked eye and optical microscope images. Contrary, in the silica solid spheres (SSS) which without mesoporous on the surface of SSS and hollow structure, the opaque is not uniformly distributed in the naked eye and optical microscope images. In addition, with the increasing applied electric field, the dark section would be disappeared likely to the polymer dispersed liquid crystal. Noticing the particular phenomenon, we proposed the mechanism of light scattering and compare to the scattering phenomena of the polymer dispersed liquid crystals (PDLCs) and cholesteric liquid crystals (CLCs). According to the specific electro-optical behavior of MPSHSs, we improve the performance of the smart window and we also propose the mixture of polymer (NOA61) and chiral (S811) to enhance the electro-optical property of MPSHSs. Besides measuring the transmittance, we also measure the response time and hysteresis effect which involve the anchoring of MPSHSs In order to find out more detailed about the light scattering mechanism and the orientation of liquid crystal surrounding to the MPSHSs so we use the azo dye (Methyl Red) which could induce the transient reorientation of liquid crystal by photoisomerization. Based on the dynamics transmittance after the photoisomerzation of azo dye (Methyl Red), we could infer the reorientation of liquid crystal and the light scattering structure. In addition, we compare this phenomenon with PDLCs and CLCs. Moreover, the intensity of excitation laser energy is changed to observe the corresponding response about MPSHSs.
Chia-ShengChang and 張家勝. "Synthesis of Mesoporous Silica Hollow Sphere by Hard-Templating Technology for Application in Liquid Crystal Displayer." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/43601352950123527215.
Full text國立成功大學
化學系碩博士班
101
Hard-templating method has been widely used to prepare the material with hollow interior. Herein, we use the PMMA beads as sacrificial hard templates to synthesize the mesoporous silica hollow spheres. To induce silica condensation on the PMMA beads, an appropriate amount of nature polymer gelatin is needed to be added for surface-activation of the PMMA beads. Consequently, the mesoporous silica hollow spheres were obtained from silicification on the gelatin-activated PMMA beads, and calcination for the removal the organic parts. The resulted mesoporous silica hollow spheres possess high surface area and large and tunable pore size. We can control the diameter and thickness of mesoporous silica hollow spheres by using PMMA beads of different sizes and repeating silicification procedures. In addition to the PMMA beads, we can also use other polymer beads as sacrificial hard templates. By adding appropriate amount of surfactant for surface-activation, the mesoporous silica hollow spheres were synthesized as well. Distinct from previous reports including complicated surface activation procedures, we proposed provides a convenient method to prepare mesoporous silica hollow spheres in high yield and reproducibility. Different from the general polymer-based smart windows (e.g. PDLC), we use the mesoporous silica hollow spheres as the additives to form scattering domains. Owing to the mesoporous shell, the hollow interiors of the silica hollow spheres are accessible to the environments. In addition, the pore size of the silica shell is larger than the dimension of the liquid crystal molecules, interiors in the mesoporous silica hollow spheres after hydrophobic silane modification would be fully filled with the liquid crystals. Thus, the hollow porous-silica spheres well disperse in the liquid crystal matrixes to form homogenous HSS-LC slurry. The HSS-LC slurry can be embedded between two transparent conductive glasses to create a HSS-LC displayer. The electro-optical device showed an opaque state with a light transmittance of about 10 %. The application of low effective voltages (= 60 V) resulted in a fast transition into a clear transparent state (T = 80 %) in millisecond range.
Li-JieLin and 林莉婕. "Realization of Smart Window with Memory Effect by Mixing Hollow Sphere Mesoporous Silica with Nematic Liquid Crystal." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/svyt4t.
Full text國立成功大學
化學系
105
Existing liquid crystal smart windows require a continuous power supply to maintain a transparent state, and therefore incur a high power consumption. In this study, a practical energy-saving strategy is demonstrated by mixing 5CB nematic liquid crystal with hollow sphere mesoporous silica (HSMS) synthesized using a soft-templating method under pH=5.5–6.0 and then hydrophobically modified by chlorotrimethylsilane. The optical microscopy observations show that the hierarchical sphere structure divides the 5CB molecules into a large number of scattering regions, and therefore produces a dense opaque state. For example, 7.5 wt% HSMS addition results in an opaque state with a transmittance as low as 23%. However, given an applied voltage of 80 V, the 5CB molecules are almost perfectly aligned and a transparent state with a saturated transmittance of 100% is obtained. Notably, the weak anchoring force between the hydrophobically modified HSMS and the liquid crystal material resists the realignment of the 5CB molecules following the removal of the electrical field and results in a residual transmittance of over 90% for more than 2 hours. Overall, the results presented in this study show that the addition of HSMS material to 5CB liquid crystal enhances the memory effect and therefore makes possible the realization of smart windows with a reduced energy consumption.
Dai-YanLu and 呂岱諺. "The physical phenomena and application of Mesoporous silica hollow sphere in nematic and chiral nematic liquid crystal." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/hx6cnf.
Full text國立成功大學
物理學系
107
Mesoporous silica hollow spheres (MPSHSs) is a kind of hollow microsphere that have large surface/volume ratio, the pore on the silica hollow spheres let the liquid crystals molecular arrange disorderly. There is a thin and disorder liquid crystals layer around the MPSHSs called that disorder layer (DOL). The order parameter in the DOL is low. The outer liquid crystals layer cannot feel the director axis from the DOL, so the anchoring of the MPSHSs is weak. According the topological defect theorem, topological defect won’t exist when R≪K/W , R is the radius of the sphere, K is the elastic constant of the liquid crystals, W is the surface anchoring of the sphere. MPSHSs will disperse in the nematic liquid crystals. DOL will not distort the surrounding director axis, the liquid crystals go through nothing. Base on the weak anchoring of MPSHSs, when we apply voltage on liquid crystal bulk, the brightness of the MPSSSs is smaller than SSS. When apply 20 V, the brightness of MPSSS is larger than SSS, because the DOL on MPSSS’s surface. On the other hand, we reduce the size of MPSHSs to 100 nm, 150 nm and 300 nm, and mixed MPSHSs with blue phase liquid crystals (BPLC) by different weight percent. The temperature range of BPLC will extend. The most effective one is 300nm MPSHSs, the temperature range increased by a factor of 1.2 in average.
Book chapters on the topic "Mesoporous silica sphere"
Yano, Kazuhisa, Tadashi Nakamura, Hiroshi Nozaki, Noritomo Suzuki, and Yuusuke Akimoto. "Synthesis of Highly Monodispersed Core/Shell Mesoporous Silica Spheres." In Advances in Science and Technology, 814–18. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/3-908158-01-x.814.
Full textLuo, Qian, Li Li, Zhiyuan Xue, and Dongyuan Zhao. "Synthesis of Nanometer-sized Mesoporous Silica and Alumina Spheres." In Nanoporous Materials II, Proceedings of the 2nd Conference on Access in Nanoporous Materials, 37–43. Elsevier, 2000. http://dx.doi.org/10.1016/s0167-2991(00)80194-9.
Full textVan Grieken, R., D. P. Serrano, C. Martos, and A. M. Melgares. "06-P-13 - Preparation and characterization of mesoporous silica spheres." In Studies in Surface Science and Catalysis, 200. Elsevier, 2001. http://dx.doi.org/10.1016/s0167-2991(01)81390-2.
Full textJin, Hongxiao, Qingyin Wu, Chao Chen, Daliang Zhang, and Wenqin Pang. "Synthesis of highly ordered large pore mesoporous silica SBA-16 spheres." In Recent Progress in Mesostructured Materials - Proceedings of the 5th International Mesostructured Materials Symposium (IMMS2006), Shanghai, P.R. China, August 5-7, 2006, 611–15. Elsevier, 2007. http://dx.doi.org/10.1016/s0167-2991(07)80396-x.
Full textLee, C. I., S. W. Lee, Y. Lee, Y. H. Chang, and Y. M. Hahm. "Preparation and sharacterization of mesoporous silica spheres by polymerization induced colloid aggregation method." In Nanotechnology in Mesostructured Materials, Proceedings of the 3rd International Materials Symposium, 193–96. Elsevier, 2003. http://dx.doi.org/10.1016/s0167-2991(03)80360-9.
Full textEtienne, M., S. Sayen, B. Lebeau, and A. Walcarius. "Organically-modified mesoporous silica spheres with MCM-41 architecture as sorbents for heavy metals." In Nanoporous Materials III, Proceedings of the 3rdInternational Symposium on Nanoporous Materials, 615–22. Elsevier, 2002. http://dx.doi.org/10.1016/s0167-2991(02)80597-3.
Full textNozaki, Hiroshi, Noritomo Suzuki, Tadashi Nakamura, Yuusuke Akimoto, and Kazuhisa Yano. "Formation mechanism of monodispersed mesoporous silica spheres and its application to the synthesis of core/shell particles." In Recent Progress in Mesostructured Materials - Proceedings of the 5th International Mesostructured Materials Symposium (IMMS2006), Shanghai, P.R. China, August 5-7, 2006, 629–32. Elsevier, 2007. http://dx.doi.org/10.1016/s0167-2991(07)80400-9.
Full textZhang, P., N. Bai, X. meng, and W. Pang. "07-P-07 - Synthesis and characterization of mesoporous Cu-silica spheres via a novel co-assemble route." In Studies in Surface Science and Catalysis, 249. Elsevier, 2001. http://dx.doi.org/10.1016/s0167-2991(01)81527-5.
Full textConference papers on the topic "Mesoporous silica sphere"
Chokkalingam, Venkatachalam, Boris Weidenhof, Wilhelm F. Maier, Stephan Herminghaus, and Ralf Seemann. "Platinum Supported Mesoporous Silica Spheres by Optimized Microfluidic Sol-Gel Synthesis Scheme." In ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels collocated with 3rd Joint US-European Fluids Engineering Summer Meeting. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30783.
Full textYing-Min Gu, Mei-Yun Tsai, Yi-Hua Tsai, Guan-Tsen Liu, Kai-Wen Chang, Hong-Ping Lin, Chih-Yuan Tang, and Ching-Yen Lin. "Synthesis of mono-dispersion mesoporous silica vesicles and spheres in 50–200 nm by using cationic-anionic binary surfactant as mesostructural template." In 2009 IEEE 3rd International Conference on Nano/Molecular Medicine and Engineering (NANOMED). IEEE, 2009. http://dx.doi.org/10.1109/nanomed.2009.5559073.
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