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无机抗菌粉体中银价态与抗菌性能研究 总被引:35,自引:2,他引:35
以SiO2为基体,Ag^ 作为主要抗菌成分的无机抗菌剂粉体,控制银离子的含量为n(Ag):n(Si)=0.0286时,在无机抗菌剂中分别引入摩尔分数约30%的Al^3 或60%的Zn^2 ,用于稳定无机抗菌剂中银价态,制备出不变色的无机抗菌粉末。利用XPS技术分析和抗菌性能测试,研究不同温度下抗菌粉体的抗菌性能和银价态关系,揭示含银无机抗菌剂银价态和抗菌性能关系及其机制。研究发现:银离子的价态对粉体的抗菌性能影响很大,当银离子以AgO状态存在时,粉体的抗菌性能较好,若为银单质存在,则抗菌性能下降。Zn^2 的加入,有利于稳定高温时抗菌粉体中的银离子仍以银的氧化物状态存在。 相似文献
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蒋志敏;季君晖;李焕新 《中国塑料》2009,23(6):86-89
研究了玻璃载体银系抗菌剂IONPURE、磷酸锆载体银系抗菌剂NOVRAN和CONVAL等3种银系抗菌剂在水中的银离子释放过程,发现IONPURE在水中的银离子释放速度最快。进一步研究了低密度聚乙烯中添加3种银系抗菌剂后的抗菌性能,结果表明,与NOVRAN和CONVAL相比,IONPURE的杀菌速度更快,然而在有水存在的情况下,IONPURE的抗菌性能下降得更快,即抗菌长效性较差。 相似文献
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利用熔融共混的方法制备了抗菌滑石粉填充聚丙烯(PP)材料,研究无机银离子抗菌剂含量对滑石粉填充PP材料力学性能、抗菌效果、耐划擦性能、长效抗菌性能和散发特性的影响.结果表明:添加1%(质量分数)的无机银离子抗菌剂,材料弯曲模量和缺口冲击强度略有增加,增加幅度约为5%;当抗菌剂添加质量分数超过0.7%时,抗菌效率均超过9... 相似文献
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研究考察了银离子抗菌剂、有机防霉剂、色粉类型对聚丙烯材料抗菌效果的影响。结果表明,银离子抗菌剂对金黄色葡萄球菌、大肠杆菌具有优异的抗菌效果,但在含有卤素色粉的聚丙烯材料中对白色念珠菌抗菌效果较差。有机防霉剂对白色念珠菌抗菌效果优异。优选抗菌剂和防霉剂制备的抗菌聚丙烯材料具有优异的抗白色念珠菌性能,可应用在多种颜色的医用周转箱。 相似文献
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以加成型双组分硅橡胶作制造导尿管的材料,在其表面涂覆含磷酸锆负载银离子的双组分硅凝胶;硫化后浸泡饱和季铵盐溶液,再经等离子处理,接枝上季铵盐,制得有机/无机抗菌剂复合改性硅橡胶.考察了有机/无机抗菌剂复合改性对硅橡胶力学性能、疏水性能、抗菌性能的影响,并用扫描电镜和红外光谱对改性硅橡胶进行了表征.结果表明,无机抗菌粉体在硅橡胶表面的分散比较均匀,季铵盐接枝到硅橡胶表面;硅凝胶涂层对硅橡胶力学性能影响很小;有机/无机抗菌剂复合改性能降低硅橡胶的表面接触角,等离子体处理距离为25 mm时含无机抗菌粉体的硅橡胶的表面接触角均≤90°;有机/无机复合改性硅橡胶对绿脓杆菌的抑制率比传统导尿管大大提高,其中含30%无机抗菌粉体的硅橡胶的抑制率到达87%,达到国家标准要求. 相似文献
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聚丙烯(PP)在使用过程中容易受到有害微生物的污染,采用双螺杆挤出机将纳米无机抗菌剂与聚丙烯进行熔融共混制备了抗菌PP,研究了抗菌PP的力学性能和抗菌性能。采用扫描电镜观察纳米无机抗菌剂在PP中的分散情况;通过原子吸收分光光度计测定了抗菌剂中银离子的溶出量。结果表明:添加4种纳米无机抗菌剂的PP均具有抗菌效果。其中,当RHA-M型抗菌剂添加量为0.2%时,抑菌环直径最小,为8.5 mm;当RHA-M型抗菌剂添加量为1.0%时,抑菌环直径最大,为30.1 mm;银离子溶出实验说明PP复合材料具有一定的抗菌持久性;通过测试该抗菌PP的拉伸强度和冲击强度,表明4种抗菌剂的加入对PP的性能影响较小。 相似文献
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采用碱处理、偶联剂处理、醋酸处理等方法,对剑麻柄进行处理,再与自行合成的脲醛树脂(UF)进行捏合、模压,制成剑麻纤维/脲醛树脂共混复合材料。研究了碱处理最佳工艺以及不同处理方法对复合材料的力学性能、耐磨性、耐水性、电性能和热性能的影响,并与木粉/UF复合材料的性能进行了对比。结果表明:剑麻柄的处理方法对复合材料的电性能、热性能和吸水性影响不大;采用乙酰化处理剑麻柄时,复合材料强度较高。耐磨性好,此时剑麻纤维/UF复合材料的各项性能接近木粉/UF复合材料的性能 相似文献
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通过化学共聚改性的方法在粉末涂料聚酯树脂中引入有机硅,合成了粉末涂料用有机硅改性聚酯树脂,研究了有机硅中间体用量对改性聚酯树脂黏度、相对分子质量及其分布、玻璃化转变温度和热失质量的影响。并用其制备了平面和消光 2种粉末涂料,研究了不同有机硅中间体加量对涂层性能的影响。结果表明:有机硅中间体加量为 42%的改性聚酯树脂具有合适的玻璃化转变温度和黏度,制备的粉末涂层具有良好的附着力;在 350℃左右的高温下平面涂层具有优秀的保光率,加入云母粉的消光涂层则具有更好的弯曲性能。有机硅改性聚酯树脂在兼顾耐热性和平面高光的同时,又解决了使用纯有机硅树脂的价格偏高的问题,为市场提供了耐高温粉末涂料用聚酯树脂的更多选择性。 相似文献
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以双酚A环氧树脂(E20)为主要成膜物,层片状玻璃鳞片和云母氧化铁为主要填料,辅助以铝粉、氧化铁红颜料,以及各种助剂和溶剂,再分别加入固化剂脂肪族胺加成物、聚酰胺TY-650,制得高固体分厚浆型环氧玻璃鳞片涂料。通过常规的力学性能(涂层的硬度、耐冲击性、柔韧性、附着力等)和耐腐蚀性测试,对比了不同固化剂对环氧玻璃鳞片涂层性能的影响。研究结果表明,脂肪族胺加成物与环氧树脂交联固化的玻璃鳞片涂层的硬度、附着力以及交流阻抗值都较高,具有良好的综合性能,加入铝粉对基体可起到阴极保护作用。 相似文献
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Polyamide/silver (PA/Ag) composite materials are regarded as potential antimicrobials by virtue of their efficacy to release the Ag+ ions in an aqueous medium. The effects of the matrix crystallinity on the Ag+ ion release characteristics of PA/Ag composites are discussed. It is found that matrix crystallinity is very decisive for the silver ion releasing properties and hence the antimicrobial efficacy of silver‐based antimicrobial polyamides. The crystallinities of the composites were evaluated using differential scanning calorimetry. The silver ion release characteristics of these composites were measured by anode stripping voltammetry. Silver ion release was higher in systems possessing lower degrees of crystallinity. Water‐diffusion characteristics of the composites control the silver ion release. The effect of crystallinity on silver ion release rate depends on the time of soaking of the specimens in water. Copyright © 2005 Society of Chemical Industry 相似文献
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以2种不同玻璃化转变温度的乳液共混作为成膜物质,加入防火助剂、无机填料和增强材料,制备了一种水性防火阻尼双功能涂料。采用防火性能测试装置、动态黏弹谱仪(DMA)和扫描电镜(SEM)等手段研究了乳液和碱式硫酸镁晶须(MHSH)对涂料防火及阻尼性能的影响。结果表明:低玻璃化转变温度乳液的加入可以提高涂料低温区的阻尼性能,但会降低涂料的防火性能。在此基础上加入适量MHSH,涂料的防火性能和阻尼性能均有提升。当乳液加入量为24%,MHSH加入量为3%时,可得到防火和阻尼综合性能均较优的双功能涂料。 相似文献
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P. Tatar N. Kiraz M. Asiltürk F. Sayılkan H. Sayılkan E. Arpaç 《Journal of Inorganic and Organometallic Polymers and Materials》2007,17(3):525-533
Antibacterial transparent thin films, containing different amounts of silver ion, have been prepared on a glass substrate
by the sol–gel process. Thin films were obtained from inorganic-organic hybrid sols derived from 3-(glicydiloxypropyl)trimethoxy
silane, N-(2-aminoethyl)-3-aminopropyl-trimethoxysilane and aluminium-sec-butoxide/ethylaceto-acetate complex and doped with
silver ions. The films were characterized by Scanning Electron Microscopy and Raman Spectroscopy. The physical properties
of the films were studied by solar-box, taber abraser, hardness test pencil, scratch-adhesion test and spectroscopy. The antibacterial
activity of the coatings were investigated against gram negative Escherichia coli and gram positive Staphylococcus aureus.
The results showed that 1% doping of the transparent hybrid thin film with silver ions resulted in high antibacterial properties
of the film. 相似文献
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Gordon Armstrong Roibeard Thornton Michael P. Ryan Fathima Laffir Ronald J. Russell Tanushree Bala Christopher Keely Ramesh Babu 《Polymer Bulletin》2012,68(7):1951-1963
Current interest in antimicrobial coatings is driven by an urgent need for more effective strategies to control microbial
infection. In this study, antimicrobial nanoclays were prepared by ion-exchange of sodium montmorillonite (MMT) with silver
ions which have been previously reported to exhibit biocidal activity. The extent of ion-exchange achieved was estimated by
X-ray photoelectron spectroscopy. The silver-modified nanoclay (AgMMT) fully inhibited growth of Gram-negative bacterium Escherichia coli DH5α (E. coli) over 24 h; annealing AgMMT under typical conditions used to prepare polymer composites did not reduce its antimicrobial
efficacy. However, powder coatings of AgMMT dispersed in epoxy/polyester resin exhibited no antimicrobial effect on E. coli. This is believed to be caused by poor wetting of the polymer coating, which restricted the diffusion of silver ions from
the coating. 相似文献
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采用高温熔融法制备了SiO2-Al2O3-MgO系统的S级高强玻璃纤维,研究了不同玻璃组分对玻璃耐酸性能的影响,利用扫描电镜(SEM)、红外光谱(IR)和核磁共振(NMR)等手段分析了酸侵蚀前后纤维的表面形貌和微观结构,进而分析了S级高强玻璃纤维在酸腐蚀环境下的破坏机理.结果表明:S高强玻璃的结构主要由硅氧四面体[SiO4]和铝氧四面体[AlO4]等构成,随着酸蚀的进行,玻璃网络结构被破坏,Si-O-Si断裂形成Si-OH键并形成凝胶附着在纤维表面;而铝氧多面体中Al-O键断裂,Al3+逐渐从玻璃结构中被置换出来,导致玻璃网络中Al3+浓度大大降低;高强系列玻璃的耐酸性能与玻璃表面的化学组成以及玻璃内部的微观结构关系密切.致密的玻璃网络结构有利于抑制H+对玻璃结构破坏,抑制阳离子与H+的置换作用;此外引入离子场强高的Ti4+,由于"积聚"作用而使玻璃结构致密,提高玻璃纤维的耐酸性. 相似文献
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Sílvia R. Gavinho Pedro R. Prezas Diogo J. Ramos Isabel Sá-Nogueira Joao P. Borges M. Carmo Lança Jorge C. Silva Célia M. R. Henriques Eduardo Pires Jakka Suresh Kumar M. P. F. Graça 《International Journal of Applied Ceramic Technology》2019,16(5):1885-1894
Bacterial infections affect about 1 in 5 patients who receive a dental implant within 5 years of surgery. To avoid the implant rejection it is necessary for the development of innovative biomaterials, with addition or substitution of the ions, for implant coatings that promote a strong bond with the new host bone and antibacterial action. The objective of this work was to synthesize a bioactive glass with different silver concentrations to evaluate their antibacterial performance. The glasses were synthesized with up to 2% silver content by melt-quenching. Structural, morphological, biological, and electrical properties of all samples were studied. The biological behavior was evaluated through cytotoxicity tests and antibacterial activity. The structural analysis shows that the introduction of silver do not promote significant changes, not altering the advantageous properties of the bioglass of the bioglass. It was verified that the glasses with a silver content from 0.5% to 2%, completely prevented the growth of both Staphylococcus aureus and Escherichia coli while being nontoxic toward mammalian cells. Therefore, these bioglasses are promising materials to be used in the production of dental implants with antimicrobial activity. 相似文献