一种煤尘抑制剂的制备及评价

本文介绍了一种煤尘抑制剂的制备方法。制备方法是对水玻璃进行化学改性后,复合腐植酸钠、羧甲基纤维素钠、十二烷基苯磺酸钠制得。结果表明,该抑制剂具有较好的固结性能及抑尘效果,且原料易得,合成方法简单,价格低廉。     

聚乳酸/海藻酸钠共混膜的制备及性能研究

本文以聚乳酸(PLA)和海藻酸钠(SA)为原料,采用流延成膜法制备了PLA/SA共混膜,并研究了PLA/SA共混膜的吸湿、力学性能及热学性能。结果表明:PLA与SA分子之间存在着较强的氢键作用力;SA的引入,提高了共混膜的结晶性能;共混膜的吸湿率随共混膜中SA含量的增加而增加;力学性能随SA含量的增加而减少。     

十四烷基二甲基苄基氯化铵存在下1,2-萘醌-4-磺酸和氨茶碱显色反应及氨茶碱测定

氨茶碱与1,2-萘醌-4-磺酸钠和十四烷基二甲基苄基氯化铵在pH=13.0的缓冲溶液中反应生成组成比为1∶2∶2红褐色产物(λmax=455nm),表观摩尔吸光系数ε=4.97×103L·mol-1.cm-1.氨茶碱的浓度在0.73～55μg·mL-1范围内与吸光度(A)呈现良好线性关系,线性回归方程为A=0.25841+0.0497C(×10-5mol.L-1),相关系数r=0.9956.回收率在96.5%以上.该方法用于测定注射液中氨茶碱的含量,结果满意.     

脱除乙二胺盐酸盐中HCl 的新方法

采用甲醇钠为中和剂, 中和乙二胺盐酸盐的新方法来脱除HCl. 由于甲醇的沸点低, 乙二胺的分馏提纯易实现,可使能耗降低. 通过中和、脱盐、脱水、蒸馏等操作得到了高纯度的乙二胺, 回收率可达94%.     

Layered carbon-based pseudocapacitive materials for lithium/sodium-ion capacitor with high energy-power densities and long cycle life

Hybrid ion capacitors that combined high-power density of supercapacitor and high-energy density of battery are drawing attention to insufficient power densities of currently-used lithium-ion batteries(LIBs).Two kinds of layered carbon-based pseudocapacitive materials were used as both anode and cathode for lithium/sodium ion capacitors(LICs/NICs) with balanced energy/power properties.As-assembled NIC and LIC could deliver the energy densities of 125.7 Wh kg~(-1)and 119.6 Wh kg~(-1) at the power density of 7941.2 W kg~(-1) and 8823.5 W kg~(-1),respectively.The electrochemical properties of NICs were better than that of LICs when the current density was below 4 A g ~(-1) although the working voltage of LIC is higher than that of NICs,and the size of Na ~(-1) is larger than that of Li~+.Using an instantaneous potential technique,it is found that the increase of the capacity for anode material in low potential region will effectively enhance the electrochemical performance for the full device.     

聚合物溴酸根在NaHSO3作用下的氧化性能研究

强碱离子交换树脂支载溴酸根得到聚合物溴酸根氧化剂，在ＮａＨＳＯ３作用下，具有良好的氧化性能，分别将伯醇和简单醚氧化为酯，仲醇为酮，α，ω－二醇和环醚为内酯，硫（或硒）醇为二硫（硒）化合物，并得到较好的收率。     

Sodium arsenite reduces severity of dextran sulfate sodium-induced ulcerative colitis in rats

The histopathological features and the associated clinical findings of ulcerative colitis （UC） are due to persistent inflammatory response in the colon mucosa. Interventions that suppress this response benefit UC patients. We tested whether sodium arsenite （SA） benefits rats with dextran sulfate sodium （DSS）-colitis. The DSS-colitis was induced by 5% DSS in drinking water. SA （10 mg/kg; intraperitoneally） was given 8 h before DSS treatment and then every 48 h for 3 cycles of 7, 14 or 21 d. At the end of each cycle rats were sacrificed and colon sections processed for histological examination. DSS induced diarrhea, loose stools, hemoccult positive stools, gross bleeding, loss of body weight, loss of epithelium, crypt damage, depletion of goblet cells and infiltration of inflammatory cells. The severity of these changes increased in the order of Cycles 1, 2 and 3. Treatment of rats with SA significantly reduced this severity and improved the weight gain.     

火焰原子吸收光谱法测定食品中钠、钾的含量

采用钠、钾两元素的次灵敏线,摸索最佳仪器工作条件,应用火焰原子吸收光谱法测定食品中前述两种元素之含量,该法线性范围宽,回收率高,更能适应批量样品的测定.     

CdSe量子点作探针共振瑞利散射法测定葡聚糖硫酸钠

在乙酸-乙酸钠缓冲溶液中,以巯基乙胺为稳定剂在水相中合成CdSe量子点,巯基乙胺自组装在量子点的表面葡聚糖硫酸钠（Dextran Sulfate Sodium,简称DSS）靠静电引力及疏水作用力结合形成粒径较大的聚集体,这种聚集体的形成导致共振瑞利散射（Resonance Rayleigh Scattering RRS）强度显著增大,最大散射峰位于536nm．同时二级散射（second-orderscattering SOS）和倍频散射（frequency-doublingscattering FDS）的强度也显著增强,最大散射峰分别位于785nm、290nm．其中,RRS方法有较高的灵敏度和较低的检出限,它的线性范围为0．012～1．0μg·mL^-1,检出限为3．68ng·mL-1．从而建立用CdSe量子点作为探针RRS法测定葡聚糖硫酸钠的灵敏度高,简便、快速的新方法．应用于尿样的测定结果令人满意．     

HEDP钠盐及质子化双HEDP铜(II)配合物的制备及其表征

本文制备了四种ＨＥＤＰ的钠盐（ＮａＨ３）·２Ｈ２Ｏ,Ｎａ２Ｈ２Ｌ·４Ｈ２Ｏ,Ｎａ３ＨＬ·４·５Ｈ２Ｏ,Ｎａ４Ｌ·８Ｈ２Ｏ）和ＨＥＤＰ铜（ＩＩ）的配合物Ｃｕ（Ｈ３Ｌ）２·１２Ｈ２Ｏ,并用元素分析、电位滴定和红外光谱作了表征。其中Ｌ＝ＣＨ３Ｃ（ＯＨ）（ＰＯ３）２。