共查询到20条相似文献,搜索用时 62 毫秒
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白光LED (light-emitting diode)因其优异的发光性能被誉为是第四代固体照明光源。本文以量子效率作为核心参数,以暖白光为最终目标,分别对蓝、绿、红三基色稀土掺杂无机荧光粉和单一基质单掺、共掺、多掺的暖白光荧光粉的研究现状进行调研。结果表明,高量子效率的近紫外激发蓝色荧光粉其激活离子主要为Eu2+、Ce3+,绿色荧光粉为Tb3+和Eu2+,红色荧光粉为Eu3+和Eu2+。现有的单一基质暖白光荧光粉仍然存在诸多技术瓶颈,如:红光不足、显色指数偏低、量子效率偏低等。基于此,建议从已有的高效红粉出发制备单一基质白光荧光粉,以消除光谱中缺乏红色成分这一难题,并适当引入除Mn之外的过渡金属元素,同时加强对基质动力学理论,以及基质和稀土之间的电子耦合作用动力学理论的研究,期望能实现稀土掺杂无机荧光粉的设计计算与可控制备。 相似文献
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DRIFTS定量分析磷酸酯包覆滑石粉表面 总被引:1,自引:0,他引:1
应用DRIFTS定量分析方法考查了热处理温度和时间对磷酸酯T10A和PNP9在滑石粉表面包覆量的影响,以及磷酸酯用量与包覆量的关系。结果表明,经水溶液法包覆,干燥后,进一步的热处理会减小T10A在滑石粉表面的包覆量,而PNP9的包覆量则在125℃左右有一最大值,热处理时间为1小时左右可使PNP9在滑石粉表面的物理吸附和化学吸附远达到最大值。PNP9用量约为6%(质量)时即出现滑石粉表面的包覆饱和, 相似文献
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以固相包覆法、气相包覆法和液相包覆法分别叙述了目前纳米颗粒表面技术的研究情况,对常用的包覆技术进行了较详细的叙述,并对纳米颗粒的表面包覆法技术进行了分析。 相似文献
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根据管道内涂层双组分涂料分输涂敷工艺的发展现状,对静态混合式涂敷器进行了研究。实验证明,该涂敷器具有效率高、结构简单、体积小、便于清洗的特点。 相似文献
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Jiahong Li Jianyu Wang Yaxuan Liu Da Bian Yongwu Zhao 《International Journal of Applied Ceramic Technology》2022,19(5):2648-2663
In this paper, a micro–nano structural ceramic coating with good hydrophobicity and wear resistance was successfully prepared by sol–gel method, which is assisted by pore-forming agent and nanoparticles 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane modified. The surface morphology, hardness, roughness, wettability, and tribological properties of three different surface coatings were characterized. With the complication of the surface structure, the roughness of the coating increases from 1.30 to 2.05 μm. Under the combined effect of roughness and long hydrophobic chains, the contact angles of the coatings before and after modification under saline conditions increased from 56.31 to 140.59° (pH4); from 55.58 to 134.40° (pH7); from 53.80 to 132.26° (pH10). Through the comparison of wear rate and wear morphology, it is found that the micro–nano structure coating has the lowest wear rate (0.705 × 10–6 mm3·N–1·s–1) and the smallest plastic deformation. This means that in addition to the good hydrophobicity and chemical stability, the micro–nano structure on the surface also improves the wear resistance of the coating. 相似文献
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为了改善氧化铝空心球的抗铝液浸润性能及强度,采用纳米硫酸钡对氧化铝空心球进行表面涂覆。以氯化钡、硫酸铵和EDTA二钠盐为原料,采用液相法在室温、pH=5.0的条件下制得纳米硫酸钡乳液,再用此乳液对氧化铝空心球进行涂覆,并分别在400、600、800、1 000℃下进行热处理。然后采用SEM观察了涂覆前后氧化铝空心球表面的显微结构特征,并进行了抗铝液浸润性及耐压强度测试。结果表明:随着热处理温度的升高,空心球表面涂层的致密度和均匀性提高,经1 000℃热处理的氧化铝空心球表面有一层均匀和完整的硫酸钡;表面涂覆硫酸钡后的氧化铝空心球具有优异的抗铝液浸润性能,且其耐压强度明显高于未涂覆的氧化铝空心球。 相似文献
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研究了热固性粉末涂料用作金属热喷涂涂层的封闭层及面层的防护技术,比较了分别喷涂环氧锌基重防腐粉末涂料、纯聚酯粉末涂料,喷涂环氧锌基重防腐粉末涂料后再喷涂纯聚酯粉末涂料以及热浸镀锌后喷涂纯聚酯粉末涂料等试样在不同盐雾和人工加速老化时间下的附着力.结果发现,只有熔融黏度偏低的环氧类粉末涂料适合用作封闭层.该复合涂层技术已应用于高速公路护栏上. 相似文献
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Anti-fog coatings have received significant attention because of their versatile applications to reduce light scattering during high humid conditions. Primarily, hydrophilic/superhydrophilic coatings are applied upon the transparent substrate to improve visibility at high humidity. The high solubility of the hydrophilic/superhydrophilic coatings in water is the main drawback for their long-term operational durability. We will report for the first time the development of functional copolymers which produces water insoluble hydrophilic coating upon application on glass surfaces. Such surfaces are commonly known as “Zwitter-Wettable” surfaces that have been developed from entirely polymeric substances using methacrylic and acrylic monomers. A series of random copolymers were synthesized using free radical polymerization of the common and commercially available monomers which were subsequently characterized using various analytical techniques, such as, GPC, 1H-NMR, and FTIR. These newly designed copolymers contained both the hydrophobic parts made up of methyl and 2-ethylhexyl groups, which provide good stability under high humid conditions and hydroxyl and carboxylic acid groups which will provide the required hydrophilicity or water absorption capacity. These polymeric coatings on the glass surfaces exhibit water advancing contact angles in the range of 57 ± 3° to 78 ± 3° with excellent anti-fog property. The anti-fog property of the polymeric films could be tuned easily by changing the ratio of hydrophobic and hydrophilic monomers. 相似文献
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微胶囊技术是21世纪重点研究开发的高新技术之一,用途广泛。将其与粘接技术相结合,不仅增加产品的附加值更是获得新特性胶粘剂的新途径。本文简要介绍了微胶囊技术在粘接涂层自修复中的应用原理及研拓进展。指出了其未来研发的难点、方向。, 相似文献
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本文综述了金融危机下世界涂料市场的发展状况,从建筑涂料、工业涂料和特种涂料等3个方面对中国涂料企业的现状、面临的机遇与挑战等进行了论述。指出中国涂料工业的前景广阔,但要赶超世界先进水平,企业需要整合、创新,建立品牌。 相似文献