MCM—41介孔分子筛结构的XRD表征

在碱性条件下,采用水热晶化法,以水玻璃为硅源,表面活性剂十六烷基甲基溴化铵为结构模板剂,成功合成出MCM－41介孔分子筛。采用XRD表征手段研究了合成条件（PH值）、凝胶配比（表面活性剂／SiO2,H2O/SiO2)和凝胶后处理条件（老化时间、晶化时间和焙烧温度）对MCM－41结构的影响。     

双峰纳晶介孔TiO2的制备及在染料敏化太阳电池中的应用

采用水热法,以三嵌段共聚物聚氧化乙烯-聚氧化丙烯-聚氧化乙烯(EO20PO70EO20,P123)为模板剂,钛酸四丁酯为前驱体,制备了双峰纳晶介孔TiO2,分别利用X射线衍射(XRD)、比表面积与孔径分析、场发射扫描电子显微镜(SEM)以及透射电子显微镜(TEM)对制备的介孔TiO2的相结构、比表面积、孔径和形貌进行了表征,探讨了P123用量对纳晶TiO2微结构的影响。以双峰纳晶介孔TiO2作为染料敏化太阳电池的光阳极材料组装的太阳电池的光电转化效率达5.18%,与相同条件下以P25作光阳极材料组装的电池效率(4.02%)相比提高了28.85%,初步显示了双峰纳晶介孔TiO2在太阳电池领域中的应用潜力。     

氨基官能化的硅基介孔材料的合成与表征

分别以十六烷基三甲基溴化铵(CTAB)和三嵌段共聚物(P123)为模板剂,正硅酸乙酯(TEOS)为硅源,合成两种硅基介孔材料MCM-41和SBA-15.通过有机硅烷偶连法将3-氨丙基三乙氧基硅烷(APTES)嫁接到已合成的两种介孔材料上,得到氨基官能化的硅基介孔材料.利用XRD、FT-IR、N2吸附-脱附和ICP含量测定对合成的材料进行表征.     

介孔二氧化硅微球的制备

以正硅酸乙酯为硅源,氨水为催化剂,通过改变表面活性剂,我们可以在碱性条件下合成不同介孔形貌的二氧化硅微球.这些粒子可以通过透射电子显微镜得到表征.在采用带电荷模板十六烷基三甲基溴化铵的水溶液的条件下将生成具有高度有序介孔通道的不规则球形粒子.在以酒精/水为共溶剂条件下将生成表面更光滑的介孔微球.在均相不带电模板十二烷基胺的条件下可以得到无序介孔通道的球形粒子.     

Synthesis and characteristics of mesoporous silica aerogels with one-step solvent exchange/surface modification

The synthesis procedures and physical properties of the ambient dried hydrophobic silica aerogels by using different contents of ethanol (EtOH)/trimethylchlorosilane (TMCS)/n-Hexane as surface modification agent were investigated. One-step solvent exchange and surface modification were simultaneously progressed by immersing silica hydrogels in EtOH/TMCS/n-Hexane solution. It is found that microstructures as well as properties of silica aerogels like porosity, specific density and specific surface area are affected by the contents of surface modification agent in the sol from the results of SEM, TEM morphology, FT-IR chemical structure, BET surface area and BJH pore size analyses. The volume of TMCS is of 10% and 20% of hydrogels, and the final product is hydrophilic xerogels. When TMCS’s percent (v/v) is elevated to 75%–100%, hydrophobic silica aerogels with good performance are synthesized, the porosities of aerogels are in the range of 93.5%–95.8% and the average pore size diameter is less than 20 nm. Funded by the National Mega-Project of Scientific & Technical Supporting Programs, Ministry of Science & Technology of China (No.2006BAJ04A 04), and the Science Foundation of Liaoning Province, China (No.20062147)     

温度响应性纳米介孔硅的制备、表征及其载药性能

以正硅酸乙酯、十六烷基三甲基溴化铵以及N-异丙基丙烯酰胺等为原料合成了一种新型的温度响应性介孔硅纳米粒,利用TEM、SEM、XRD、TG和氮气吸附脱附等温线对其结构进行了表征。结果表明:介孔硅微粒具有规则的介孔结构,温敏性物质N-异丙基丙烯酰胺成功嫁接于介孔硅表面。以红景天苷为模型药物,温度响应性介孔硅的载药率和包埋率分别为62.08μg/mg和31.04%。温度响应性介孔硅对红景天苷释放具有一定温度响应性。     

Synthesis and characterization of multi-walled carbon nanotube doped silica aerogels

Multi-walled carbon nanotube doped silica aerogels(MWCNT-SAs) were synthesized from a wet gel of well-dispersed MWCNT by one-step solvent exchange/surface modification and ambient pressure drying(APD). Waterglass was employed as a precursor to prepare wet gel. The content of MWCNT varied from 0 to 15% volume by wet gel. The surface group, thermal stability and microstructure of pure silica aerogel and MWCNT-SAs were investigated by FTIR, DTA, and TEM. Experimental results show that MWCNT-SAs are hydrophobic when the temperature is below 400 ℃, MWCNT-SAs exhibit a mesoporous network structure, and they achieve the largest scale with least shrinkage and lowest density when doped with 5 vol% MWCNT.     

碱性条件下介孔二氧化硅的制备

以十六烷基三甲基溴化铵作为模板剂,在不同碱性条件下合成介孔二氧化硅材料,并对它的合成方法、合成因素的影响等方面进行阐述.     

Synthesis and characterization of pure mesoporous zirconia thin film with two-dimensional hexagonal framework

Sincethediscoveryofanewfamilyofsilica basedmesoporousmaterialsdesignatedasM41Sbyresearchers atMobilOilCorporationin1992[1,2],avarietyofmeso porousmaterialshavebeenpreparedusingstructure di rectingagents,suchasionicornonionicsurfactants,as templates[3-9].M…     

Synthesis and Characterization of Mesoporous Silicon Oxynitride MCM-41 with High Nitrogen Content

Mesoporous silicon oxynitrides MCM-41 were synthesized saccessfully. The resulttng materials not only have high nitrogen contents and good structural characteristics of MCM-41 ( high surface area, narrow pore size distribution and good order), but also are amorphous. The composition and structure of the materials were investigated by CNH elemera analysis, XPS, Si MAS NMR, XRD , HRTEM and N2 sorption, respectively.Mesoporous silicon oxynitrides MCM-41 with a high nitrogen contera are still non-crystal (amorphous).     

复合模板剂合成介孔二氧化硅

介孔材料具有非常广阔的应用前景，以具有无毒1生物降解特性的叶温－20为模板剂，在少量十六烷基三甲基溴化铵的复合作用下，合成了具有均一孔径的介孔二氧化硅材料。     

复合模板剂合成介孔二氧化硅

介孔材料具有非常广阔的应用前景.以具有无毒、生物降解特性的吐温-20为模板剂,在少量十六烷基三甲基溴化铵的复合作用下,合成了具有均一孔径的介孔二氧化硅材料.     

常压干燥法制备介孔SiO_2气凝胶

以硅酸钠为硅源,三甲基氯硅烷为表面修饰剂,采用浸泡老化、表面改性、溶剂置换和分级干燥等措施,避免了常压干燥过程中的体积收缩,制备出具有高比表面积的介孔SiO2气凝胶.所得SiO2气凝胶密度为0.128～0.139 g/cm3,比表面积为617～656 m2/g,平均孔径为14.49～20.20 nm.红外光谱分析表明气凝胶表面已被甲基所覆盖.     

Synthesis,structural characterization and hydrogen storage of nickel-containing mesoporous MCM-48 by electroless plating

Hydrogen is a promising fuel for it is clean, highly abundant and non-toxic, but on-board storage of hydrogen is still a challenge. So it is imperative to have an efficient method of hydrogen storage. The mesoporous MCM-48 especially the nickel-containing MCM-48 has great potential in hydrogen storage. MCM- 48 was prepared by hydrothermal synthesis. Then electroless plating technology was used to deposit Ni on the surface of MCM-48 under ultrasonic environment. Powder X-ray diffraction (XRD), transmission electron microscopy (TEM), and N₂ adsorption-desorption were employed to investigate the pore structure properties. The results showed that all the samples had Ia3d cubic structure and pore channels were highly ordered. Hydrogen adsorption studies showed that the MCM-48 after nickel plating adsorbed nearly twice the amount of hydrogen than pure MCM-48 at 2.0 MPa, 263 K. So we believe that a small amount of Ni can improve the capacity of hydrogen adsorption of MCM-48 efficiently.     

酸性条件下介孔二氧化硅材料的制备

非离子表面活性剂为结构模板剂,在高于硅的等电点条件下（pH=2—5）,采用预水解法,合成了介孔氧化硅材料．分析了介孔氧化硅材料的合成过程,认为酸度、反应温度等因素对合成出的介孔材料具有重要作用．     

Low-cost preparation of mesoporous silica with high pore volume

Mesoporous silica materials with high pore volume were successfully prepared by the chemical precipitation method, with water glass and a biodegradable nonionic surfactant polyethylene glycol （PEG）. The obtained materials were characterized by transmission electron microscopy （TEM）, scanning electron microscopy （SEM）, thermo gravimetric analyzer and differential scanning calorimetry （TG-DSC）, nitrogen adsorption-desorption measurements, and X-ray diffraction （XRD）. The results showed that the changes of the pore parameters depended on both the surfactant content and heat treatment temperature. When the content of PEG was 10wt% and the obtained PEG/SiO2 composite was heated at 600℃, the mesoporous silica with a pore volume of 2.2 cma/g, a BET specific surface area of 361.55 m^2/g, and a diameter of 2-4 μm could be obtained. The obtained mesoporous silica materials have potential applications in the fields of paint and plastic, as thickening, reinforcing, and flatting agents.     

可循环利用介孔SiO2材料的制备及其对染料的吸附性能

以CTAB为模板,TEOS为硅源,P25和Fe3O4纳米颗粒为功能性纳米颗粒,通过水热法一步制备出具有可回收性、光降解性和高吸附效率的介孔染料吸附材料.结果表明:所制备的材料对染料的吸附效果很好,吸附率可达99.0%;在光照下,染料可以在10 min内迅速降解;在磁场作用下,材料得以回收,并且经焙烧处理后可以重复利用;材料在重复利用5次后,吸附率为59.4%,染料在60min内可以完全降解,符合工业染料废水处理剂的要求.     

MCM-41介孔薄膜的制备与表征

以十六烷基三甲基溴化铵(CTAB)为模板剂,正硅酸乙酯（TEOS）为硅源,在极稀溶液、室温、大量氨水体系中,采用水热沉积法制备了MCM-41介孔薄膜,通过X射线衍射（XRD）、透射电（TEM）、红外光谱（IR）和Roman光谱等技术表征了其结构.XRD测试表明,合成的薄膜具有MCM-41介孔结构特征,基底的性质对介孔薄膜的生长有一定程度的影响.TEM 图像对介孔薄膜晶胞参数的估算基本与XRD结果吻合,表明制备的薄膜均匀,有一定取向性且孔道平行于基底表面.对单晶硅基底上生长的MCM-41介孔薄膜的光学性能考察表明,该薄膜对1.06μm 的激光有二次谐波效应.     

PO4^3-／Al—MCM-41介孔分子筛合成及表征

通过液晶模板机理合成了Al-MCM-41介孔分子筛,并用磷酸浸渍法制备PO4^3-/Al—MCM-41。通过X射线衍射（XRD）、氮气吸附-脱附、红外光谱、Hammer指示剂胺滴定等方法对所合成样品进行了表征。XRD和N2吸附脱附研究结果表明,PO4^3-／Al-MCM-41有较规则的孔道结构。平均孔径3．10nm,比表面积为560m^2／g。酸量滴定分析表明,PO4^3-／Al-MCM-41具有较强的酸性。     

Preparation and characterization of silica gel powders

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