用炭质凝胶体制备新炭球的方法

引言有关炭球体的研究,以中间相小球体为主,有大量报导。我们实验室也把粉碎了的中间相体分散在相溶性小的油中,通过高温下表面软化的表面张力成球的乳化法,成功地制得收率高,直径均匀的中间炭微珠(MCB)并对其物性及应用作了报告。     

高压处理对橡实淀粉凝胶体质构特性的影响

用TA-XT2i质构仪测定经高压处理橡实淀粉凝胶体质构体特性。结果表明,高压处理对淀粉凝胶体口感有显著影响;淀粉加工过程中,通过控制高压处理的含水率、压力大小和保压时间,得到所需特性的淀粉;高压处理各因素对淀粉凝胶体质构特性的影响力顺序为：淀粉类型〉含水率〉保压时间〉压力大小。     

Preparation of Ultrafine Tungsten Powder by Sol-Gel Method

Sol-gel method was employed for the preparation of nanoscale tungsten powder. The effects of different preparation conditions on particle size were discussed and the optimum preparation condition was found. The products were characterized by X-ray diffraction, scan electron microscopy and so on. The results show that the intermediate is monoclinic WO3, its particle shape is approximately spherical, and the particle size distribution is narrow. The average particle size is about 60 nm. After deoxidization, WO3 turns into cubic tungsten powder with small particle size （average particle size about 120 nm） and narrow size distribution.     

深井矿山全尾砂胶结充填体早期强度特性及微观影响机理分析

为研究深井矿山全尾砂胶结充填体的早期强度特性,以某铁矿全尾砂为试验材料,在分析该矿全尾砂材料的粒径级配组成、化学成分等基本物理化学特性基础上,制备了灰砂比1∶4、1∶6、1∶8和料浆浓度为59%、62%和65%的充填体试样,测定龄期为3d和7d时单轴抗压强度,并借助扫描电镜(SEM)对充填体微观结构进行观察与分析。结果表明:超细全尾砂胶结充填体早期强度较低,充填体强度与灰砂比、料浆浓度和龄期存在正指数关系,且随着龄期的增加,充填体强度增长显著。SEM显示,当充填体龄期为3d时钙钒石和C-S-H凝胶体生成量较少,胶凝物对尾砂的包裹效果较差,充填体内部存在较大空隙,结构松散,表现为强度较低;充填体龄期为7d时钙钒石被凝胶包裹,充填体内部空隙逐渐缩小,结构密实,表现为强度增长。超细全尾砂胶结充填体早期强度对龄期敏感程度最高,灰砂比次之,料浆浓度较低。     

聚合物基有机-无机纳米复合材料的制备、性能及应用

Six preparation methods for polymeric organic-inorganic nanocomposites and their respective mechanisms and features are reviewed. The extraordinary properties of polymeric organic-inorganic nanocomposites are discussed,and their potential applications are evaluated.     

化学灌浆在船闸裂缝动水封堵中的应用

分析某船闸漏水裂缝成因及危害，阐述用丙凝灌浆封堵其裂缝漏水的浆液配置及施工工艺，并说明其堵漏效果．     

炭质凝胶体的基本物性

引言两条媒性沥青物(水溶性中间相)的碱性水溶液,随时间的推移其粘度上升,最终流动性消失,成为一种凝胶状物。这样的高分子缩合多环芳烃形成的凝胶体未见报导。我们把它命名为炭质凝胶体,并作一介绍。蒸发除去这种炭质凝胶体中的溶剂,所得的干燥凝胶体与原料的水溶性中间相相比,显示了不同的物性。这种干凝胶体被认为可调制球状、膜状和块状材料。因此,充     

Preparation and H^＋ response mechanism of W/WO3 pH electrode by sol-gel method

1 INTRODUCTION Acidityis one of the most i mportant parame- ters in aqueous samples . Although the glass elec- trodeis byfar the most commonly used pHsensor , li mitations of the glass electrode ,such as acid and alkaline error , high i mpedance , high temperature instability and mechanical fragility restrict its fur- ther application to pH determination in the wider range[1]. Therefore ,the researchinterest has been directed toward the development of alternatives to conventional glass el…     

明胶与к-卡拉胶交互作用特性及机理的研究——明胶与卡拉胶共凝胶体的力学特性

本文对明胶与卡拉胶共凝胶体的力学特性进行了研究,小变形实验发现随体系卡拉胶百分数的增加,贮能模量在增加。大变形实验发现共凝胶体的破裂强度及质构随体系两种大分子的配比、体系的pH值、离子强度的变化而变化。