热处理对多孔玻璃性能的影响

采用Na2O-B2O3-SiO2系统制备了多孔玻璃.采用氮吸附静态容量法,研究了多孔玻璃的氮吸附特性、比表面积和孔分布曲线.讨论了热处理时间和温度对多孔玻璃的孔径和孔隙率分布的影响.结果表明,多孔玻璃随着热处理温度的增加,气孔率增大,孔径增大.在520℃下进行分相处理12h后,放入1mol/L的盐酸中浸析24h获得最佳多孔玻璃样品,样品的孔径分布可从10(A)到100(A),对应的孔容为80.95116 cm2·g-1.     

纳米多孔玻璃的制备与孔径影响因素的研究

采用Na2O-B2O3-SiO2系统制备了基体玻璃,经分相和酸浸析等处理,制得了纳米多孔玻璃.采用扫描电镜(SEM)、氮吸附静态容量法(BET),测得了多孔玻璃的表面微观结构、氮吸附等温线、比表面积和孔分布曲线.探讨了组分掺杂、酸溶工艺、分相时间和温度对多孔玻璃孔径的影响,研究结果显示在SiO2含量及Na2O/BzO3保持不变的条件下,组分掺杂是调整多孔玻璃孔径方便而有效的途径.     

分相温度及时间对CPG孔径影响的研究

采用Na2O-B2O3-SiO2玻璃,经分相、酸溶清洗后,得到高硅氧孔径可控的纳米多孔玻璃（CPG）,CPG的孔径为50nm~100nm,同时研究了分相温度、分相时间对孔径的影响。     

酸溶工艺对多孔玻璃性能的影响研究

采用硼硅酸盐玻璃经熔融、磨、成珠、分相、酸溶和膜化等处理方法.制得了多孔玻璃微珠.讨论了酸溶温度、酸浓度和浸析时间对多孔玻璃微珠浸析过程的影响.通过对多孔玻璃微珠组分对比,分相温度、时间的对比,酸溶时间的对比,得到控制多孔玻璃微珠最佳工艺,总结出了多孔玻璃微珠孔径的控制方法.     

高强度多孔玻璃基片的制备条件研究

详细探讨了高强度无裂纹多孔玻璃基片的组成、制备工艺和制作技术,分析了母体玻璃分相过程中的影响因素,酸浸析中玻璃碎裂的原因以及酸浸蚀过程中酸浓度对多孔玻璃孔径的影响,提出了采用1%～2%的Na2SiO3处理多孔玻璃有利于新生态孔道的修饰和片体强度的提高的新见解.     

多孔玻璃的性质、用途及制备

介绍了多孔玻璃在科学技术及国民生产中的各种用途.对多孔玻璃的制备工艺原理作了论述,并从玻璃组成、热处理时间和温度、酸度处理以及掺杂等角度阐述了制备工艺中影响孔径大小和分布的因素.比较了康宁工艺和PPG工艺.最后,列举了多孔玻璃的一些性质,指出多孔玻璃研究和应用中尚需解决的问题.     

多孔玻璃的性质,用途及制备

介绍了多孔玻璃在科学技术及国民生产中的各种用途,对多孔玻璃的制备工艺原理作了论述,并从玻璃组成,热时间和温度、酸度处主掺杂等角度阐述了制备工艺中影响孔径大小和分布的因素,比较了康宁工艺和ＰＰＧ工艺,最后,列举了多孔玻璃的一些性质,指出忆玻璃研究和应用中尚需解决的问题。     

液氨介质中多孔硅粉对钙和铕的吸附性能

通过吸附钙和铕来改变多孔硅的表面状态,以提高其发光效率。采用金属辅助化学腐蚀法制备多孔硅粉,以液氨为介质溶解金属钙和铕,使钙和铕吸附在多孔硅表面。利用扫描电子显微镜、傅里叶变换红外光谱仪、能谱仪对多孔硅粉特性以及多孔硅粉在液氨介质中对金属钙和铕的吸附性能进行表征。结果表明:金属辅助化学腐蚀硅粉表面的孔径受腐蚀液温度的影响,当腐蚀液温度为40℃时,硅表面孔径最均匀且孔径最大;在液氨介质的作用下,多孔硅粉吸附氨分子基团,形成Si—(NH2)2;多孔硅通过液氨介质能够吸附金属离子,使金属胺钙均匀沉积在多孔硅粉表面,金属胺铕非均匀沉积在多孔硅表面。     

宏孔性多孔玻璃载体颗粒的制备

利用填充法直接制备宏孔的多孔玻璃载体颗粒，探讨了造孔剂的种类及含量和烧结过程对颗粒的粒度分布、孔隙率、孔径分布及机械强度的影响，确定了复配造孔剂的适宜比例和工艺条件。结果表明，采用复配造孔剂解决了宏孔颗粒的强度与孔隙率、孔径的矛盾，在烧结温度800℃左右，保温时间2h的条件下，保证孔径在60－180μm，孔隙率稳定在40％以上，而强度达到2.4MPa以上。     

多孔玻璃制造中的应力分析

对多孔玻璃制备中的应力进行了分析，产生应力的主要原因是：分相玻璃热膨胀系数不匹配；离子交换；毛细管力和水合力的作用。分相玻璃在浸析过程中由于组成、分相制度、冷却速度的不同，而使多孔玻璃受到拉应力或压应力，通过改善浸析条件可制得具有一定强度、没有裂纹的多孔玻璃。     

Effect of Thermal Treatment and Acid Leaching Process on Pore Characteristics of Nanometer Porous Glass

Porous glass was prepared by thermally treating sodium borosilicate glass for different time, the effect of thermal treatment on pore size distribution was discussed and the pore size of the prepared porous glass was measured by scanning electron microscopy （SEM） and differential thermal analysis （DTA）. The results show that the optimum porous glass with an average diameter of 80 nm can be prepared by thermal treatment at 600℃ for 12 h and then acid treatment for 12 h in 2 mol·L^-1 hydrochloric acid solution.     

Synthesis and structural characterization of macroporous bioactive glass

Porous sol-gel glass of CaO-SiO2-P2O5 system with macropores larger than 100 μm was prepared by adding stearic acid as pore former when the sintering was carried out at 700 ℃ for 3 h. The sol-gel porous glass shows an amorphous structure. The diameter of the pore created by pore former varies from 100 to 300 μm, and macroporous glass has a narrow and small pore size distribution in mesoporous scale. The porosity and pore size ofmacroporous bioactive glass can be controlled.     

Preparation and bioactivity of sol-gel macroporous bioactive glass

Bioactive glass is well known for its ability of bone regeneration,and sol-gel hioactive glass has many advantages com- pared with melt-derived bioactive glass.3-D scaffold prepared by the sol-gel method is a promising substrate material for bone tissue engineering and large-scale bone repair.Porous sol-gel glass in the CaO-SiO_2-P_2O_5 system with macropores larger than 100μm was prepared by the addition of stearic acid as a pore former.The diameter of the pore created by the pore former varied from 100 to 300μm.The formation of a hydroxyapatite layer on the glass was analyzed by studying the surface of the porous glass by scanning elec- tron microscopy,energy dispersive spectroscopy,X-ray diffraction,and Raman spectra after they had been immersed in simulated body fluid(SBF)for some time,and the porous glass shows good bioactivity.     

管式硅基裂解膜陶瓷支撑体的制备

以二氧化硅粉为无机粉料,玻璃粉为粘合剂,通过改变组分配比,实现了对陶瓷支撑体热膨胀系数的调节,从而使支撑体与表层硅基裂解膜热膨胀系数保持一致,以防止在高温条件下膜的龟裂．同时,通过调节无机粉料及成孔剂等组分粒径的大小及其分布,控制陶瓷支撑体的孔结构．制备出孔结构、强度,以及热膨胀系数等多方面,满足要求的多孔陶瓷支撑体．     

Dynamic Adsorption of Toluene on Hierarchical Porous Carbons with Varying Pore Structure

Hierarchical porous carbon material (MMC) was successfully fabricated via hard template synthesis method by carbonization of furfury alcohol within the template (MCM-41).The prepared MMC was studied with characterization methods including scanning electron microscopy (SEM),transmission electron microscopy (TEM),nitrogen adsorption-desorption analyses,and infrared spectral analysis (FTIR).To investigate kinetics of toluene adsorption of hierarchical porous carbon materials,the adsorption performances of these carbon samples with varying pore structure (MC-1,MMC,MMHPC) were analyzed via dynamic adsorption.And the Langmuir model and Freundlich equation were employed to correspond with adsorption isotherms to study the adsorption mechanism.The experimental results demonstrate that the Langmuir model is more appropriate to describe the adsorption process.The capacities of toluene adsorption follow the order of MMC MMHPC (micro-meso hierarchical porous carbon) MC-1(microporous carbon).MC-1 has satisfactory absorption performance due to its large pore volume and high ratio of micropores.MMHPC has excellent toluene adsorption performance for proper amounts of surface oxygen containing groups.Long saturation time,interconnected hierarchical pore channels,and large specific surface area make MMC also a promising material for VOCs treatment.These data reveal that the pore channel structure,rational pore distribution,high surface area and reasonable amounts of surface oxygen groups are the main factors contributed to excellent toluene adsorption performance,which proposes theoretical basis for hierarchical porous carbon materials to further engineering application.     

Pore structure of new composite adsorbent SiO_2·_xH_2O· yCaCl_2 with high uptake of water from air

The adsorption/desorption property of adsorbent is crucial to the performance and efficiency of a system of extracting water from atmosphere. Several kinds of adsorbent can adsorb water vapor in air, such as molecular sieve and silica gel. But their equilibrium uptake is not high. The authors have prepared a new composite adsorbent——SiO2·xH2O·yCaCl2, which is composed of macro-porous silica gel and calcium chloride. The preparation process is as follows: immerge macro-porous silica gel …     

隐框玻璃幕墙温度应力的有限元分析

为进一步了解隐框玻璃幕墙温度应力的分布规律,采用ANSYS有限元分析软件,对单块隐框玻璃在内外温差作用下的应力分布进行了模拟分析,并分析了玻璃尺寸对温度应力分布的影响.结果表明:在内外温差作用下,玻璃板角部的应力最大,且在室外温度为-30,℃时应力最大;随长宽比的增大,玻璃板长边应力、短边应力以及板中心应力均逐渐增大,且板中心应力增大较快,水平向线应变逐渐增大,而竖直向线应变逐渐减小,玻璃板心挠度先增大后略微减小.     

强化甲醇制氢反应的酚醛树脂基炭膜制备

为了强化甲醇制氢反应,分别以酚醛树脂和间苯二酚-甲醛为前驱体,制备了炭膜及复合炭膜.采用扫描电镜和氮气物理吸附等手段对炭膜及复合炭膜的微观形貌与孔径分布进行了分析.考察了原料粒度及固化剂用量对炭膜孔结构以及涂膜次数对复合膜分离性能的影响,并将所制备的炭膜与复合炭膜耦合在反应器内用于强化甲醇水蒸汽重整制氢反应.结果表明,当固化剂质量分数为6%时,炭膜孔径分布最窄,且平均孔径为0.16μm.随涂膜次数从1次增至3次,复合炭膜的透气性先降低后增大.对于甲醇水蒸汽重整制氢反应的转化率而言,炭膜与复合炭膜反应器分别比传统固定床提高了1.6倍和1.9倍.