Preparation and characterizations of interpenetrating polymer network hydrogels of poly(ethylene oxide) and poly(methyl methacrylate)

Interpenetrating polymer network (IPN) hydrogels based on poly(ethylene oxide) and poly(methyl methacrylate) were prepared by radical polymerization using 2,2‐dimethyl‐2‐phenylacetophenone and ethylene glycol dimethacrylate as initiators and crosslinkers, respectively. The IPN hydrogels were analyzed for sorption behavior at 25°C and at a relative humidity of 95% using dynamic vapor sorption. The IPN hydrogels exhibited a relatively high equilibrium water content in the range of 13–68%. The state of water in the swollen IPN hydrogels was investigated using differential scanning calorimetry. The free water in the hydrogels increased as the hydrophilic content increased. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 258–262, 2003     

硫铁矿烧渣制高纯氧化铁红的研究

研究了以广东云浮硫铁矿烧渣经浮选法制得的铁红五级品为原料,采用化学絮凝法除二氧化硅,制取高纯度的氧化铁红的工艺技术。其过程主要包括:硫酸亚铁的合成,絮凝除二氧化硅等杂质,碳酸亚铁的合成,后处理。考察了制备过程中,氨水的加料次序、pH、反应温度和时间、搅拌速度等因素对产品收率和纯度的影响。结果表明,所得产品三氧化二铁质量分数为99.45%,二氧化硅质量分数<0.0096%。产品可用作软磁铁氧体的原料。     

有机金属先驱体分解制备铟和氧化铟纳米颗粒

介绍了有机金属先驱体In(η5-C5H5)分解制备铟(In)和氧化铟(In2O3)纳米颗粒的实验方法,并利用透射电子显微镜(TEM)观察制备的In和In2O3纳米颗粒的微观结构.     

利用翅片管束外表面降膜反应脱除烟气中SO2的实验研究

A new wet flue gas desulfurization method by reaction across the falling liquid film on the outside surface of axial finned-tube bundle and its principles of removal of SO₂ are presented in this paper.The effects of different styles of tube bundle,and the pitch of tubes,flue gas velocity,gas-liquid ratio and flue gas temperature on desulphurization efficiency and the moisture content of flue gas are studied.The experiment results show that desulphurization effect is better for flue gas at 65℃,4.0m·s^-1 against the tube bundle of 10 rows with relative pitch of staggered rows S₁/d=2.1,S₂/d=1.8.     

铝合金6061在低硫酸浓度硬质氧化过程中氧化膜微观组织的演变

采用自制的阳极氧化试验装置和扫描电子显微镜分别对铝合金6061在硫酸浓度为1%、2%、3%、4%和5%H2SO4(W t.%)的氧化液中形成的硬质阳极氧化膜进行研究。结果表明:随着硫酸浓度的增大,氧化膜的显微硬度和表面粗糙度降低,氧化膜中的孔洞逐渐变大;与硫酸浓度为1%和2%相比,3%左右硫酸浓度的氧化液所得到的氧化膜的均匀程度较好,以3%左右硫酸浓度的氧化液对铝合金6061进行硬质氧化较为理想。     

脉冲电子束系统沉积高温超导薄膜研究

高温超导薄膜生长是研究超导现象和超导器件的基础,一直是凝聚态物理研究的一个重要课题。各种各样的薄膜生长方法都被应用于高温超导薄膜的生长研究。采用一种崭新的薄膜沉积设备——脉冲电子束沉积系统(PED)成功制备出了NCCO、LSCO高温超导薄膜,并通过优化沉积参数,获得了具有良好表面形貌和超导转变特性的高温超导薄膜。     

Preparation of micro-patterned surfaces of Si-N-O films and their influence on adhesion behavior of endothelial cells

Microgrooves were prepared on Si(100) surface by photolithography and wet etching.Subsequently,Si-N-O films were deposited on the microgrooves by unbalanced magnetron sputtering(UBMS) and micro-patterned surfaces of Si-N-O films were obtained.The size of the micropatterns was measured by surface profilometer.The chemical composition of Si-N-O films were characterized by X-ray photoelectron spectrometry(XPS) and the wettability of the micropatterned surfaces was evaluated by contact angle measurement.The beh...     

Enhancing diamond drilling performance by the addition of non-ionic polymer to the flushing media

Drilling is a most important and crucial operation in the excavation industries.With the objective of looking into the enhancement of diamond drilling performance detailed laboratory investigations were carried out on phosphate rock.The effect of Poly (Ethylene Oxide) (PEO) added to the drilling water was studied by varying machine parameters and PEO concentration.The responses were rate of penetration and torque at the bit rock interface.Slake durability tests were also performed to understand the slaking behavior of phosphate rock in PEO solutions.     

聚酰亚胺的制备及其性能表征

以均苯四酸二酐(PMDA)为二酐单体,对苯二胺(PDA)为二胺单体,通过低温缩聚合成一系列聚酰胺酸(PAA)和聚酰亚胺(PI)薄膜,对其结构和力学性能进行表征。结果表明,聚酰胺酸的酰亚胺化较完全,PMDA-PDA聚酰亚胺薄膜的拉伸强度达到290 MPa。     

赤泥中氧化铝和氧化铁的浸出

为回收赤泥中的铝和铁,解决赤泥污染和占地问题,研究了用盐酸溶出废赤泥中的氧化铝和氧化铁的工艺,考察了赤泥的焙烧、盐酸与赤泥的液固比、盐酸的浓度、酸浸时间、酸浸温度及酸浸方式对赤泥中氧化铝、氧化铁浸出率的影响.结果表明：赤泥不需要焙烧,盐酸与赤泥的液固比4∶1,盐酸的浓度为6mol/L,酸浸温度在109℃左右,酸浸时间为60 min,酸浸方式为二次浸出,氧化铝和氧化铁的浸出率分别为89.00%和98.39%.