Preparation and Characterization of the HA/MWNTs and HA/TiO2 Nanotubes Composite Biomaterials

羟基磷灰石（HA）是人体骨骼和牙齿的最主要无机成分，人工合成的HA具有良好的生物相容性和生物活性，但HA脆性大、强度低，抗折强度和断裂韧性指标均低于人工致密骨的特性，限制了它在临床的实际应用。医用金属钛表面涂覆HA可结合金属材料的良好力学性能和HA良好生物性能，已被广泛地用作人体硬组织替代材料。然而，HA与钛基底热膨胀系数失配造成的残余应力，降低了涂层与基底之间的结合力，临床应用中常出现涂层脱落或植入体松动现象。二氧化钛纳米管具有良好的生物活性、抗腐蚀性及耐磨损性，因此，发展HA/二氧化钛纳米管复合增强体，可望起到增韧补强作用，提高HA涂层的力学性能，具有重要的临床应用价值。磷酸钙骨水泥（CP...Hydroxyapatite (Ca10(PO4)6(OH)2, HA) is the main inorganic component in natural bone and tooth. The synthetic form of HA has good biocompatibility and bioactivity, unfortunately, its mechanical properties including brittleness, low strength, flexural strength and fracture toughness all are lower than that of natural bone, which inhibits its clinical applications. Conducting HA coatings on biomedic...学位：理学硕士院系专业：化学化工学院化学系_物理化学(含化学物理)学号：2052006115200

Preparation and Characterization of the HA/MWCNTs Composites

为了赋予碳纳米管(CnTS)表面良好的生物性能,拓展CnTS在硬组织生物材料及组织工程支架材料中的应用,采用化学共沉淀和水热后处理法宏量制备了羟基磷灰石(HA)/多壁碳纳米管(MWCnTS)复合材料,通过调节制备过程中浓硝酸纯化的MWCnTS加入量,考察不同MWCnTS含量的HA/MWCnTS复合材料的结合形式.扫描电子显微镜(SEM)和透射电镜(TEM)表征结果表明,当ω(MWCnTS)=15%时,MWCnTS表面均匀地包覆了一层由纳米HA晶粒紧密相连的膜层,在此情况下MWCnTS与纳米HA形成最佳结合状态.体外细胞培养实验表明,制备的HA/MWCnTS复合材料具有良好的生物相容性.In order to get a good biological performance for carbon nanotubes,in this work,multi-walled carbon nano-tubes(MWCNTs) were purified by the nitric acid,and purified MWCNTs were treated by a chemical coprecipitation of hydroxyapatite(HA) under the hydrothermal reaction.By changing the content of MWCNTs,a series of HA/MWCNTs composites with various percentages of MWCNTs were successfully prepared.The results characterized by SEM,TEM and spectroscopic measurements revealed that the MWCNTs could be well coated with a dense nano-hydroxyapatite coating when the content of MWCNTs was about 15%(by mass).In this case,the optimal combination between HA and MWCNTs can be achieved.In vitro cell culture demonstrates that the prepared HA/MWCNTs nano-composites with 15%(by mass) MWCNTs exhibit a good biocompatibility.国家自然科学基金(20773100)资

Electrochemical Corrosion Behavior of Copper Clad Laminate in NaC1 Solution

应用线性极化、循环伏安(CV)及电化学阻抗谱(EIS)等电化学方法对覆铜板(CCL)和纯铜的腐蚀电化学行为进行了研究和比较.结果表明,覆铜板的耐蚀性弱于纯铜,其阳极溶解过程与纯铜有所不同;在较低电位下,CCL以铜的氯化络合物的形式溶解,CuCl_2~-的扩散为该过程的控制步骤;随着电位的升高,腐蚀产物CuCl在电极表面形成疏松多孔的膜,Cl~-在膜中的传输成为溶解过程的控制步骤.电极表面CuCl膜的消长过程是产生感抗弧的主要原因.Comparing with pure copper,the corrosion behavior of copper clad laminate(CCL)in NaCl solution was studied by using linear polarization,cyclic voltammetry(CV)and electrochemical impedance spectroscopy(EIS).It was shown that CCL had a different corrosion behavior and showed a lower corrosion resistance compared with the pure copper.At low polarization potential,CCL dissolves through the formation of CuCl_2~-,which may be a determined step in the anodic process.And when the polarization potential increased,a porous film containing CuCl formed on the CCL surface,and the transportation of Cl~- in the film became the controlling step in the corrosion process.An inductive loop at low frequency was observed in the EIS measurement,which was attributed to the modulation of CuCl film due to the competition between dissolution and growth processes on CCL surface.国家自然科学基金(50571085)资助项

Electrochemical corrosion behavior of copper clad laminate in NaCl solution

Comparing with pure copper, the corrosion behavior of copper clad laminate (CCL) in NaCl solution was studied by using linear polarization, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). It was shown that CCL had a different corrosion behavior and showed a lower corrosion resistance compared with the pure copper. At low polarization potential, CCL dissolves through the formation of CuCl2-, which may be a determined step in the anodic process. And when the polarization potential increased, a porous film containing CuCl formed on the CCL surface, and the transportation of Cl- in the film became the controlling step in the corrosion process. An inductive loop at low frequency was observed in the EIS measurement, which was attributed to the modulation of CuCl film due to the competition between dissolution and growth processes on CCL surface

新疆棉蚜生态治理技术

该成果属于农业技术领域，是农业害虫无公害防治技术方向的实用技术成果。该成果根据新疆植棉历史与棉花害虫发生规律的研究，揭示了新疆棉蚜成为主要害虫的原因是冬小麦种植面积大量减少，从而导致棉田棉蚜的天敌来源减少，充足的食物和不足的自然天敌造成了新疆棉蚜成灾;经过多年探索和深入研究，发现苜蓿、苦豆子等具有最大的食物昆虫涵养量并且可以作为自然天敌繁殖库，发现这些植物生长期早而造成了其涵养天敌被利用中最关键的时间优势;创造了诱导棉田边缘植物带自然天敌进入棉田控制棉蚜的简便途径，从而达到了人为协助情况下充分利用自然天敌控制棉花蚜虫的高效生态控制目的;巧妙地利用了长期以来一直得不到充分利用的农田林网林阴带种植耐阴牧草植物苜蓿，提高了土地利用率，并且为农村发展畜牧业提供了条件，探索出适合农业产业结构调整的农、林、牧相结合的害虫治理新模式;创造性地提出了植物应当并且可以作为生物防治因素加以利用的“相生植保”害虫防治新思路。该项成果适合新疆棉区棉蚜无公害控制，同时也为其他农业害虫防治提供了参考

新疆棉花可持续优质高产综合技术集成示范工程

该项目通过技术综合集成,分别形成早熟棉区、中低产棉区、风沙土棉区相应的100、120、150、200和250kg棉花优质高产栽培技术模式与配套技术体系;根据种植区光热、土壤条件,创立增株增铃为主的技术路线,将亩株数从认为已达极限的1.1万株增至1.8-2.2万株;利用农区多样性生物相生相克关系,首创种植苜蓿带防治棉蚜“生态棉田”新模式,实现无害化生产;根据新疆早熟棉区冬寒多雪,利用长效肥缓释特点,改基肥＋追肥的传统施肥为秋季一次性全耕层施肥技术;建立性诱剂、赤眼蜂、病毒杀虫剂、瓢虫扩繁等研制、开发及其综防体系,并加以应用;其脱落酸研究成果具有我国自主知识产权,在棉花种植中应用,可促进根系发育、..