复合纳米TiO2薄膜银钛协同抗菌与净化研究

通过水热法制备了Mo、N共掺杂的TiO2纳米管,再将其分散制备成溶胶,用电泳沉积在氧化铝基材上成膜,再将薄膜经AgCl溶胶浸泡后紫外光照制备Ag／Agcl／TiO2薄膜。考查在银钛协同效应下复合材料的光催化活性与抗菌性能。结果表明,复合后的Ag／Agcl／TiO2薄膜通过银钛协同作用极大地提高了其抗菌和净化性能。     

纳米V_2O_5/TiO_2-SiO_2复合材料的抗菌性能

以高比表面多孔纳米TiO2-SiO2为载体,用浸渍法制备纳米V2O5/TiO2-SiO2复合材料,考察了其抗菌性能,采用TEM、FTIR、XPS、XRD等手段对产物进行了表征。结果表明,复合材料不需紫外光照射即具有较强的抗菌性能,对大肠杆菌和金黄葡萄球菌产生透明抑菌圈,直径达11~13 mm。复合材料中V以V5+和V4+形式存在,部分V5+已进入TiO2晶格取代Ti4+,发生了氧化还原反应,产生了电子转移,形成了新键;O1s电子结合能和Ti2p结合能增大;掺杂促进TiO2-SiO2从锐钛型向金红石相转化,抑制粒径的长大,使复合材料活性提高。     

纳米二氧化钛对竹粉/PVC抗菌性能的影响

制备了添加不同纳米二氧化钛(TiO2)含量的竹粉/聚氯乙烯(PVC)复合材料,研究纳米TiO2对复合材料力学性能和抗菌性能白子影响,结果表明,纳米TiO2能显著提高复合材料的力学性能,且赋予材料对大肠杆菌和金黄色葡萄球菌很好的抗菌性能;当纳米TiO2质量分数为1.2%时,复合材料的抗菌率大于90%,抗菌效果显著;当纳米TiO2质量分数为1.6%时,复合材料的抗菌率均超过了99%,且复合材料具有良好的抗菌长效性.     

载银TiO2/碳纳米管复合材料的制备及其催化杀菌性能

采用溶胶-凝胶法, 在450℃下煅烧制备载银TiO₂/碳纳米管纳米复合材料;采用XRD、SEM以及N₂吸脱附对样品的晶体结构及样品微观形貌进行表征;通过UV-vis漫反射光谱表征了复合材料对紫外可见光的吸收性能;以甲基橙为模型污染物, 评价了样品紫外光光催化降解甲基橙的活性, 以大肠杆菌和枯草芽孢杆菌为菌种, 采用抑菌圈法表征样品的杀菌性能。结果表明, 载银TiO₂/碳纳米管纳米复合材料比纯TiO₂纳米颗粒有更好的紫外光光催化活性, 其中掺碳纳米管(CNTs)1%(质量分数)的效果最好, 紫外光照射150min, 降解率达到76.5%;载银TiO₂/碳纳米管纳米复合材料比TiO₂纳米颗粒、Ag纳米粒子、CNTs(纯化处理后)的杀菌效果都要好很多, 其中掺CNTs 10%(质量分数)的样品的杀菌效果最好, 抑菌圈直径达到25.8mm。     

二氧化钛负载细菌纤维素纳米复合材料的抗菌性及细胞相容性的研究

利用细菌纤维素的超精细网络结构和持水率高的特点,通过钛酸异丙酯水解在细菌纤维素上原位负载了TiO2颗粒,并对其微观结构等进行表征,同时对二氧化钛负载细菌纤维素纳米复合膜的抗菌性能和生物相容性进行研究.抗菌实验结果说明TiO2/BC纳米复合材料具有很强的抗菌性能,对大肠杆菌和金黄色葡萄球菌的抑菌圈直径分别达到15 mm和...     

纳米二氧化钛复合材料的抗菌性能研究

以钛酸丁酯为主要原料,采用金属离子掺杂、复合半导体等方法制备不同的纳米二氧化钛复合材料,研究复合后对其抗菌性能的影响。结果表明:Ag+/TiO2 SiO2和V2O5/TiO2 SiO2两种材料不需紫外光照射即具有较强的抗菌性能,应用其制备的陶瓷对大肠杆菌和金黄葡萄球菌的杀抑率均在99%以上。对其抗菌机理进行了初步的分析。     

燃烧合成Ag、La掺杂纳米TiO2及光催化性能研究

采用燃烧合成法制备了Ag、La掺杂纳米TiO2.XRD实验表明,La掺杂TiO2为单一相锐钛矿结构,Ag掺杂TiO2中出现了少量金红石相,与未掺杂纳米TiO2比较,Ag、La掺杂使TiO2晶体粒度更小,约8 nm.TEM实验表明,产物粒度分布均匀.用掺杂纳米TiO2降解罗丹明B,研究了元素掺杂量对TiO2催化性能的影响.结果表明,当Ag和TiO2摩尔比为1∶150、La和TiO2摩尔比为1∶75时,两种材料的催化能力最好,均优于未掺杂TiO2.比较Ag、La掺杂TiO2的催化性能,La掺杂TiO2的催化能力更强,在实验条件下,紫外光照射1.5 h,罗丹明B的降解率为99.0%.     

Al_2O_3/TiO_2纳米抗菌剂的制备及性能

以TiC l4、A l2(SO4)3为原料,控制n(A l2O3)/n(TiO2)=0.2,采用液相共沉淀法制备了A l2O3/TiO2纳米抗菌剂,并用DSC-TG、XRD、UV-vis等手段研究了A l2O3复合对TiO2抗菌性能的影响。结果表明,复合A l2O3后,TiO2纳米抗菌剂经900℃煅烧后完全是锐钛矿结构;950~1 050℃为良好的混晶结构,其中,经950℃煅烧后,混晶结构中锐钛矿相质量分数约占77%,平均粒径约20 nm,可见光吸收带边红移显著,光吸收阈值由纯TiO2的380 nm红移至430 nm左右,抗菌性能好,在荧光灯下对大肠杆菌和金黄色葡萄球菌的抑菌圈直径达15mm左右。     

载银纳米二氧化钛对聚丙烯结晶性能影响

熔融挤出制备载银纳米二氧化钛(TiO2/Ag+)/聚丙烯(PP)复合材料,采用差示扫描量热仪研究纳米(TiO2/Ag+)对PP结晶性能的影响。结果表明:少量纳米TiO2/Ag对PP有成核促进作用,提高了结晶速率,使结晶度增大;当纳米TiO2/Ag十质量份数超过1%时,PP结晶陛减弱,甚至起一定的抑制作用;纳米TiO2/Ag+能提高PP结晶温度,而对PP熔融温度影响不大。     

载银纳米二氧化钛在抗菌塑料中的应用研究进展

对载银纳米二氧化钛(Ag/TiO2)抗菌剂的抗菌性能、制备方法以及抗菌机理等进行了分析与总结。根据Ag/TiO2抗菌剂的特点,介绍了添加Ag/TiO2抗菌剂的抗菌塑料的一般制备方法,最后介绍了该类抗菌塑料的潜在应用。     

Antibacterial activity of silver photodeposited nepheline thin film coatings

Antibacterial characteristic of silver makes this material very appealing for surface coating on various substrates. In this study, we investigated different silver containing powder for this purpose. Specifically we examined the antibacterial activity of Ag/nepheline compared with Ag/TiO₂ and Ag/SiO₂. Our analysis suggested “Ag/nepheline” composite thin film is an appropriate coating for production of antibacterial ceramic tiles in large scale. In our investigation, FactSage software was used for the thermodynamic analysis. Nano-silver was obtained from silver nitrate solution by ultraviolet illumination of distilled water. In this process, silver was doped on micronized TiO₂, SiO₂, or nepheline. The silver composites and monolithic silver were sprayed with water on raw tiles and sintered in a furnace. Exploring the results suggested the best component for achieving antibacterial tile is Ag/nepheline.     

Studies on the synthesis of electrospun PAN‐Ag composite nanofibers for antibacterial application

We have successfully synthesized polyacrylonitrile (PAN) nanofibers impregnated with Ag nanoparticles by electrospinning method at room temperature. Briefly, the PAN‐Ag composite nanofibers were prepared by electrospinning PAN (10% w/v) in dimethyl formamide (DMF) solvent containing silver nitrate (AgNO₃) in the amounts of 8% by weight of PAN. The silver ions were reduced into silver particles in three different methods i.e., by refluxing the solution before electrospinning, treating with sodium borohydride (NaBH₄), as reducing agent, and heating the prepared composite nanofibers at 160°C. The prepared PAN nanofibers functionalized with Ag nanoparticles were characterized by field emission scanning electron microscopy (FESEM), SEM elemental detection X‐ray analysis (SEM‐EDAX), transmission electron microscopy (TEM), and ultraviolet‐visible spectroscopy (UV‐VIS) analytical techniques. UV‐VIS spectra analysis showed distinct absorption band at 410 nm, suggesting the formation of Ag nanoparticles. TEM micrographs confirmed homogeneous dispersion of Ag nanoparticles on the surface of PAN nanofibers, and particle diameter was found to be 5–15 nm. It was found that all the three electrospun PAN‐Ag composite nanofibers showed strong antibacterial activity toward both gram positive and gram negative bacteria. However, the antibacterial activity of PAN‐Ag composite nanofibers membrane prepared by refluxed method was most prominent against S. aureus bacteria. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

Synergism in novel silver-copper/hydroxyapatite composites for increased antibacterial activity and biocompatibility

This study develops a novel silver-copper/hydroxyapatite composite (Ag–Cu/HA) with high biocompatibility and antibacterial activity. Two different materials were synthesized, namely silver-hydroxyapatite (Ag-HA) and copper-hydroxyapatite (Cu-HA) composites, with 0.1%, 0.5%, and 1.0% (mol) of each metal. These materials were mixed in a planetary mill to obtain the Ag–Cu/HA composites. The results of our characterization demonstrated the low cytotoxicity and hemolytic response. The composite showed higher percent-inhibition for bacterial growth compared to those in separated composites of silver or copper with hydroxyapatite. Hence, these new materials promise higher efficacy as antibacterial hydroxyapatites.     

Enhanced the dispersibility and permeability of silver nanoparticles over rGO grafted by positively-charged polyethyleneimine toward broad-spectrum sterilization

Silver nanoparticles (Ag NPs) are used as antimicrobial agents due to their high-efficiency, broad-spectrum disinfection activity. However, the agglomeration and stability problems caused by excessive release of silver ions (Ag⁺) have severely restricted their developments. Herein, a novel silver/polyethyleneimine/reduced graphene oxide (Ag/PEI/rGO) antibacterial material featuring good dispersibility and permeability was rationally designed, thus benefiting for the capture of bacteria due to the introducing of highly-cationic PEI modifier and controllable release of biocidal agents (Ag⁺). Compared with Ag/rGO, the Ag/PEI/rGO has excellent stability and shows a more efficient sterilization efficacy against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) with 100% germicidal efficiency with low orders of dozens of ppm. In addition, the outstanding biocompatibility of this Ag/PEI/rGO antibacterial material endows it with promising potential in sterilization applications, which is expected to solve the infection problem caused by bacterial biofilm formation.     

Silver-doped pseudowollastonite synthesized from rice husk ash: Antimicrobial evaluation,bioactivity and cytotoxic effects on human mesenchymal stem cells

Research into biomaterials has grown rapidly in recent years due to the clinical need for organ and tissue replacement and regeneration. One of the most serious complications in orthopaedic implants is surgical site infection. Therefore, many attempts have been made to develop biocompatible materials with antibacterial properties. In this study, a newly-synthesized pseudowollastonite (PSW), synthesized from rice husk ash and a limestone precursor, was incorporated with different concentrations of silver (Ag) and sintered to enhance the antimicrobial activity and biocompatibility of pseudowollastonite-silver (PSW/Ag) biocomposites. The antibacterial test revealed that PSW, with the addition of silver up to 5?wt%, was able to inhibit the growth and reproduction of bacteria. The bioactivity test for the PSW/5?wt% Ag biocomposite also displayed the existence of an apatite peak in the X-ray diffraction pattern. The apatite microstructure was observed with FESEM-EDX after seven days of immersion in simulated body fluid (SBF) solutions. Cytotoxic effects of the composite were observed after 24?h of incubation in 10% leachate containing hMSC cells. After 72?h of incubation, the survival cells were proliferated considerably. The viability was shown with the positive increment after 72?h of incubation for PSW with the addition of 5?wt% Ag. Thus, although PSW/5?wt% Ag synthesized from the rice husk ash and limestone was shown to be bioactive and have good antimicrobial properties, the composite still needs to be optimized to control cytotoxic effects.     

Fabrication of silver-doped apatite powders from silver-substituted octacalcium phosphate powders via solid–solid phase-conversion process

The excellent biocompatibility of apatite (hydroxyapatite, HAp; carbonate apatite, CO₃Ap) materials makes them suitable candidates as bone substitutes. However, they have no antibacterial ability. Meanwhile, silver (Ag) exhibits excellent antibacterial properties across a wide antibacterial spectrum. However, soluble Ag salts exhibit cytotoxicity and poor aesthetic properties. We dope Ag into an apatite unit lattice in order for the composite material to exhibit antibacterial contact abilities while simultaneously limiting the release of Ag⁺, which is the primary cause of the unwanted color changes and cytotoxicity. When a crystal structure in which silver ions are substituted for Ca in octacalcium phosphate (OCP) (Ag-OCP) is immersed in water and/or (NH₄)₂CO₃-containing solutions, Ag-OCP is converted into an apatite containing Ag via a solid–solid phase-transformation process. The Ag contents of the apatite and precursor Ag-OCP are the same. The CO₃ content of apatite samples depends on the (NH₄)₂CO₃ concentration of the treated solutions. A single-pot, single-step treatment enables the synthesis of both Ag-containing HAp and CO₃Ap. Further, these Ag-containing HAp and CO₃Ap samples show little color change from that of the precursor Ag-OCP.     

Variations of antibacterial activity and silver characteristic of silver‐containing activated carbon fibers undergoing cyclic antibacterial tests

Seven cycles of antibacterial tests were performed on silver‐containing activated carbon fibers derived from liquefied wood (WACF/Ag) to investigate the variations of their antibacterial activity and silver characteristics. The results showed that all the WACF/Ag had the excellent antibacterial durability. Less silver ions were released from WACF/Ag prepared at the soaking concentration of 0.2 mol/L. Both silver and silver ion content followed a decreasing trend with an increase in cycle number of antibacterial tests, and the significant drop occurred in the first cycle. The silver on the surface and in mesopores was almost removed in the first cycle of antibacterial tests, while that in micropores was released slowly with increasing cycle number of antibacterial tests. The schematic illustrations for WACF/Ag revealed that the number of silver nanoparticles in micropores had the determined effect on the antibacterial durability. POLYM. COMPOS., 38:1404–1411, 2017. © 2015 Society of Plastics Engineers     

含银复合乳液对混凝土表面抗菌性能的影响

海工混凝土是海洋开发必需的基础材料,然而海工混凝土服役寿命易受微生物腐蚀(MIC)的不良影响。本研究制备、表征并评价了一种新型Ag/TEOS/IBTS复合乳液 (ATS),该乳液可涂覆在混凝土表面预防MIC。与Ag/TEOS复合乳液(AT)和Ag/IBTS复合乳液(AS)相比,ATS防水性能最好,其接触角可达119.67°。激光共聚焦扫描显微镜(CLSM)结果表明,ATS、AT和AS具有良好的抗菌黏附性能,其中银粒子赋予了乳液优良的杀菌能力。FT-IR和SEM结果表明,砂浆表面的疏水层是由Si—O—Si交联形成的。这种新型涂料对提高海工混凝土的使用寿命具有重要意义。     

Adsorption and antibacterial activity of silver‐dispersed carbon aerogels

Silver‐dispersed carbon aerogels (Ag/CAs) were obtained by the direct immersion of organic aerogels in aqueous AgNO₃ solutions and then carbonization of the resulting material under a nitrogen atmosphere. The adsorption and antibacterial activity of Escherichia coli and Staphylococcus aureus on Ag/CAs were studied by the measurement of the amount of viable bacteria in suspensions and scanning electron microscopy (SEM) observations. The adsorbed amount of bacteria on samples without silver increased with an increase in the carbonization temperature and contact time. SEM studies showed that the adsorption capacity of Ag/CAs decreased with an increase in the silver content; this was considered to be mainly due to the dissolution behavior of bacteria by silver ions. The antibacterial test showed that 2.5 mg of Ag/CAs with more than 3.6% Ag could inhibit the growth of 10⁵ cfu/mL E. coli in 10 mL of a Mueller–Hinton broth culture, but in the case of S. aureus, 10‐mg samples just got the same antibacterial effect. An antibacterial persistency test showed that 25 mg of Ag/CAs with 6.5% Ag could kill 50 mL of 10⁵ cfu/mL E. coli eight times. These results indicate that Ag/CAs possess strong and long‐term antibacterial activity. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 1030–1037, 2006     

Ag NPs改性鱼鳞明胶-琼脂复合膜的制备及性能表征

利用鱼鳞明胶作为还原剂和稳定剂制备银纳米颗粒（silver nanoparticles, Ag NPs），研究Ag NPs添加量（0.04wt%-0.2wt%）对鱼鳞明胶-琼脂复合膜的理化性能和抗菌性能的影响。通过透射电子显微镜和X射线粉末衍射对合成的Ag NPs进行表征，结果表明制得Ag NPs为球形形貌，平均粒径为9.3 ?1.8 nm。随着Ag NPs添加量的增加，鱼鳞明胶-琼脂复合膜的色泽变黄渐深，透明度下降，对紫外和可见光的吸收增强，同时，复合膜的断裂延展性、水蒸气阻隔性能和耐水性能显著增强，而厚度和抗拉强度却无明显变化。FTIR和热重分析结果表明，Ag NPs与膜基质间存在化学相互作用，并在一定程度上改善了复合膜的热稳定性。抑菌环实验结果显示，复合膜可以在0.04wt%-0.2wt%较低的银浓度下实现良好的抗菌效果。研究结果将为鱼鳞明胶可降解抗菌包装材料的开发提供新思路。