有机粘结剂替代膨润土制备氧化球团

为了提高球团矿铁品位,研究新型有机粘结剂D替代膨润土对球团制备的影响。研究结果表明:采用有机粘结剂D完全替代膨润土,当其用量为0.25%~0.30%(质量分数)时,即可获得满足要求的生球性能及成品球强度,但预热球强度很低,只有100 N/个左右,只能用于对预热球强度要求不高的球团生产工艺;而有机粘结剂D部分替代膨润土时,不仅可以获得良好的生球性能及成品球强度,预热球强度也可满足生产要求;在0.10%有机粘结剂D和0.50%膨润土的条件下,生球落下强度大于3次/(0.5 m),且爆裂温度大于600℃,成品球强度达到2.6~2.9 kN/个,预热球强度大于400 N/个;有机粘结剂D的应用使球团铁品位明显提高,用0.30%有机粘结剂D完全替代膨润土时,球团铁品位为64.07%,比1.0%膨润土的球团提高0.76%;采用0.10%有机粘结剂D和0.50%膨润土时,球团铁品位为63.74%,比1.0%膨润土球团提高0.43%。     

有机粘结剂强化烧结制粒

研究了添加有机粘结剂Ｇ对制粒过程的影响．结果表明，添加有机粘结剂Ｇ使水在矿粉颗粒表面的润湿角降低，提高了矿粉的亲水性，强化了制粒过程；似粒子内部颗粒间受力分析表明，由于润湿角的降低使作用在润湿周边的界面张力以及毛细作用力增大，从而提高了似粒子的强度     

涂料胶粘剂在涂层成形时的作用原理

从胶体化学角度，综述了胶乳和淀粉作为造纸涂料胶粘剂时对粘结强度的影响因素，以及涂料体系中颜料粒子的吸附和成膜过程的低表面张力现象。当颜料对胶粘剂吸附力强，同时胶粘剂体系的表面张力小时，则涂层粘胶强度大。     

胶粘剂迁移的影响因素及迁移机理

涂布加工过程中胶粘剂的迁移对涂布纸的质量有关重要的影响，掌握胶粘剂迁移的影响因素及迁移机理有助于对其进行有效的控制。本文评述了国内外对影响胶粘剂迁移的因素以及迁移机理的研究现状，并对今后的研究方向提出了建议。     

有机物对磷酸铝型砂的抗湿机理的初探

探讨了有机物 PP改善磷酸铝砂抗湿性的机理 ,认为在稍高于软化点的温度下加热固化 ,可使有机物 PP包裹在砂粒表面 ,在一定程度上阻止了水分子进攻阳离子与“O—”之间的化学键 ,结果使磷酸铝砂的抗湿性大大提高。     

羧甲基淀粉钠提高球团强度的机理

对市售食用红薯淀粉进行羧甲基化,制备出羧甲基淀粉钠,并对合成反应机理进行了分析.以羧甲基淀粉纳为有机粘结剂进行造球试验,冷固球团干球抗压强度达322.8N/个,落下强度为16.18次/m,生球爆裂温度为820℃.此外,对羧甲基淀粉纳提高球团强度的机理进行了研究,发现当生球中加入羧甲基淀粉钠0.4%(质量分数)时,颗粒表面张力接触角由48°降至5°,粘滞力随之提高.光电子能谱研究表明羧甲基淀粉钠的极性基团在铁矿表面的键合使得Fe的2p轨道能由711eV降至710.2eV;极性基团的表面化学吸附是提高球团强度的重要因素,极性基团效应及有机链架的特殊空间网状结构是提高生球爆裂温度的关键.     

各种添加剂对低温陶瓷结合剂性能的影响

实验主要研究6种添加剂对陶瓷结合剂性能影响。实验证明,随着α-Al2O3加入量的增多,结合剂的熔点逐渐升高,在加入量为15%时流动度最好;CuO、Cr2O3和Zn对结合剂熔点有明显的提高作用;Sn和Cu可以降低结合剂的熔点;加入8%Cr2O3或加入6%Sn时其流动度值最佳。     

高应变率下复合炸药的细观数值模拟

针对复合炸药8701中RDX晶体与粘结剂分别对复合炸药8701平均力学性能的影响,建立了相应的细观数值计算模型.通过SHPB实验获得了8701在应变率600 s-1时的动态应力-应变曲线,根据Taylor均匀化方法得到了细观计算的宏观应力-应变曲线.结果表明:细观数值计算模型结果与8701的试验结果具有较好的一致性;在高应变率加载下,RDX晶粒和粘结剂的应力随应变都在增加,但由于RDX的强度和质量分数更大,因此对8701整体力学性能起主导作用.      

碳点修饰硅在锂离子电池中的应用研究

Silicon (Si) particles were functionalized using carbon dots (CDs) to enhance the interaction between the Si particles and the binders. First, CDs rich in polar groups were synthesized using a simple hydrothermal method. Then, CDs were loaded on the Si surface by impregnation to obtain the functionalized Si particles (Si/CDs). The phases and microstructures of the Si/CDs were observed using Fourier-transform infrared reflection, X-ray diffraction, scanning electron microscopy, and high-resolution transmission electron microscopy. Si/CDs were used as the active material of the anode for electrochemical performance experiments. The electrochemical performance of the Si/CD electrode was assessed using cyclic voltammetry, electrochemical impedance spectroscopy, and constant current charge and discharge experiment. The electrodes prepared with Si/CDs showed good mechanical structure stability and electrochemical performance. After 150 cycles at 0.2 C, the capacity retention rate of the Si/CD electrode was 64.0%, which is twice as much as that of pure Si electrode under the same test conditions.     

MGB probe assay for rapid detection of mtDNAl1778 mutation in the Chinese LHON patients by real-time PCR

Objective： Leber＇s hereditary optic neuropathy （LHON） is a maternally inherited degeneration of the optic nerve caused by point mutations of mitochondrial DNA （mtDNA）. Many unsolved questions regarding the penetrance and pathophysiological mechanism of LHON demand efficient and reliable mutation testing. This study aims to develop a minor groove binder （MGB） probe assay for rapid detection of mtDNA11778 mutation and heteroplasmy in Chinese LHON patients by real-time polymerase chain reaction （PCR）. Methods： Forty-eight patients suspected of having LHON and their maternal relatives underwent a molecular genetic evaluation, with 20 normal individuals as a control group at the same time. A real-time PCR involving two MGB probes was used to detect the mtDNA 1 1778 mutation and heteroplasmy. A linear standard curve was obtained by pUCmLHONG and pUCmLHONA clones. Results： All 48 LHON patients and their maternal relatives were positive for rntDNA11778 mutation in our assay, 27 heteroplasmic and 21 homoplasmic. Eighteen cases did not show an occurrence of the disease, while 9 developed the disease among the 27 heteroplasmic mutation cases. Eleven did not show an occurrence of the disease, while 10 cases developed the disease among 21 homoplasmic mutation cases. There was a significant difference in the incidence between the heteroplasmic and the homoplasmic mutation types. The time needed for running a real-time PCR assay was only 80 min. Conclusion： This real-time PCR assay is a rapid, reliable method for mtDNA mutation detection as well as heteroplasmy quantification. Detecting this ratio is very important for predicting phenotypic expression of unaffected carriers.