Electrostatic effect and Donnan effect could effectively improve the separation performance of nanofiltration membrane. Polyions were grafted from graphene oxide (GO) nanosheets to prepare the nanofiltration membrane, and the electrostatic effect and Donnan effect in the membrane pores could be greatly improved. The GO was modified by introducing double bonds. Then, polyanionic poly(acrylic acid) (PAA) and polycationic diallyldimethylammonium chloride (PDDA) were grafted from GO nanosheets, which were employed to fabricate the nanofiltration membranes, respectively. Therefore, nanofiltration membranes GO-PAA and GO-PDDA with cross-linked structure and pH responsiveness were prepared. The separation effect of the anionic dyes was over 99%, and the membrane had perfect adsorption effect on cationic dyes. The cross-linked structure formed between GO nanosheets inhibited the change of the interlayer spacing of the nanofiltration membrane. The conformation of the graft chains could be adjusted by the pH value of the solution, by adjusting the size of the nanochannel. The rejection rates of the nanofiltration membranes for the cationic dyes could reach more than 98%, and the membrane had perfect adsorption effect on anionic dyes. Similar to the grafted polyanion, the grafted polycation also formed a cross-linked structure between the graphene nanosheets, thereby inhibiting the change of the nanochannels with the pH value to a certain extent. Polyionic nanofiltration membranes have excellent selectivity and could be widely used in the treatment of dye wastewater and other fields.
环氧树脂(EP)具有优良的综合性能,在电子封装等领域应用广泛,但其自身热导率较低,如何提升环氧树脂的热导率成为了近年来的研究热点.根据制备工艺,目前主要有本征型和填充型两种制备方法.文章综述了填充型导热环氧树脂复合材料研究进展,从填料类别、填料处理方法以及导热机理与路径进行介绍,最后总结了该领域研究的不足,并对其发展趋势进行了展望.
组织育人是构建新时代高校大思政格局的新形式、新探索.为提高区域高校组织育人工作成效,基于60余项浙江省高校的组织育人工作案例,从新时代高校组织育人的背景与定位、主体与功能、实施路径等维度深度探析高校组织育人的体系建设,提炼了浙江省高校组织育人的经验与启示.浙江省高校组织育人的核心是加强党对高校各类组织的全面领导,本质是强化各类组织立德树人的职责,基础是加强组织自身建设,基本方式是将组织建设与教育引领相结合,保障是加强体制机制建设,特色是与地域实际有机融合.该研究对高校落实立德树人根本任务、构建大思政新格局具有参考意义.
校企地党建共同体融合发展是新时代基层党建工作理念追求的产物,也是高校党建创新亟需解决的现实问题.论文从新时代经济社会发展对高校党建要求出发,论证了校企地党建共同体融合发展的必然性;从高校党建自身发展需求出发,探讨了校企地党建共同体融合发展的必要性;以浙江理工大学的探索为个案,从协同理论的视角分析了校企地党建共同体融合发展的可行性与内在逻辑,提出可以从目标协同、主体协同、载体协同和路径协同等方面着手,切实提升党建共同体建设的成效.
农村文化礼堂是满足基层群众精神文化需求和振兴乡村文化的重要媒介.全面建成小康社会后,相对贫困治理成为治国理政面临的长期性问题,作为农村公共服务的新载体,农村文化礼堂发挥出的整合乡村文化资源、激发基层社会治理效能和维系社会关联等功能,对守护农民精神家园、提振农村精神活力、摆脱相对精神贫困和深化农村改革发挥了不可替代的作用.同时需看清,农村文化礼堂建设也面临着资源分配不均、政府外部输入与村庄内部建构之间难以协调和内生动力不足等现实问题,对此可以通过挖掘地域特色、完善配套保障和强化需求导向等途径来优化农村文化礼堂建设.
