载银纳米TiO2表面改性对抗菌涂料性能的影响

以硅烷偶联剂(KH-570)对纳米TiO2/Ag+进行表面处理,对处理后的纳米TiO2/Ag+进行表征后证实,硅烷偶联剂以化学键的形式键合在纳米TiO2的表面。采用原位乳液聚合方法制得载银纳米TiO2/苯乙烯-丙烯酸酯复合乳液,TEM测试表明纳米TiO2被均匀地包覆在乳液中。采用该复合乳液为基料与各助剂等原料按一定比例配制成涂料,经性能测试后表明,与普通共混制得的涂料相比,该涂料的抗菌性能得到明显的提高,并且有很强的紫外光吸收性能。     

纳米羧甲基壳聚糖抗菌纸的制备及其力学性能研究

目的研究羧甲基壳聚糖纳米颗粒的制备以及抗菌纸的力学性能。方法以Ca Cl2为离子交联剂,通过离子交换反应,将羧甲基壳聚糖制成纳米颗粒,然后将纳米羧甲基壳聚糖水溶液涂布在纸张表面,制备成抗菌纸并检测其力学性能。结果随着羧甲基壳聚糖溶液浓度的升高,所需的交联剂钙离子浓度也有所升高,抗菌纸的环压强度、耐破度及撕裂度随着涂布纳米羧甲基壳聚糖浓度的增加均有所增加,厚度没有明显变化,能满足包装需求。结论经过纳米羧甲基壳聚糖的涂布,抗菌纸的机械强度均有所增加,能满足抗菌纸的力学性能要求。     

羧甲基壳聚糖/Ce^3＋掺杂TiO2复合抗菌材料的研究

采用溶胶-凝胶法制备稀土（Ce^3＋）掺杂纳米TiO2（纳米Ce/TiO2）,借助XRD、BET、SEM对Ce/TiO2进行表征。结果表明纳米Ce/TiO2晶型为锐钛矿,平均晶粒大小为19.95nm,比表面积为43.302m^2/g。采用超声波催化法合成了羧甲基壳聚糖（CMC）,并与Ce/TiO2复配制得羧甲基壳聚糖/Ce3＋掺杂纳米TiO2复合材料（CMC/Ce/TiO2）,借助FT-IR对CMC及CMC/Ce/TiO2复合材料进行了结构表征。初步研究了纳米Ce/TiO2、普通纳米TiO2、CMC/Ce/TiO2、CMC的抗菌性能,结果显示纳米Ce/TiO2对大肠杆菌和金黄色葡萄球菌的抗菌率分别为55%和53%,普通纳米TiO2对两种菌的抗菌率分别为50%和45%,Ce^3＋的掺杂可提高纳米TiO2的抗菌性能;CMC/Ce/TiO2对大肠杆菌和金黄色葡萄球菌的抗菌率分别达到99%和95%,CMC对两种菌的抗菌率分别为90%和80%,Ce/TiO2的复合可显著提高CMC的抗菌性能。     

壳聚糖/纳米TiO2杂化材料的制备及抗菌性能表征

制备了壳聚糖/纳米TiO2杂化膜,表征了其抗菌性能,分析了影响TiO2纳米粒子在壳聚糖溶液中分散性的影响因素。FT-IR、AFM分析了杂化膜的结构与形态。表明促进TiO2颗粒良好分散有四个主要因素:(1)表面电荷的重新分布;(2)空间保护作用;(3)化学键的相互作用;(4)超声分散。抗菌实验表明壳聚糖/纳米TiO2杂化膜具有很强的抗菌性能,细菌的形态学变化具有两个显著的特点:(1)细胞内物质渗漏,在细胞周围形成了环状结构;(2)细胞表面囊泡的形成。     

TiO2/聚乳酸复合纳米纤维膜的制备及其抗菌性能

采用静电纺丝技术,分别制备了纯聚乳酸(PLA)纳米纤维膜和不同TiO2含量的TiO2/PLA复合纳米纤维膜。利用扫描电子显微镜、傅里叶红外光谱和电子万能试验机分别对复合纳米纤维膜进行了形貌表征、成分分析和力学性能测试,用改良的振荡烧瓶法测试了复合纳米膜的抗菌性能。结果表明:随TiO2含量的增加,纤维直径减小而CV值和表面颗粒尺寸有所增加;复合纳米纤维膜中含有TiO2成分,证明TiO2与聚乳酸能够物理复合;添加适量的TiO2能够提高纳米纤维膜的断裂强度;在光催化条件下,TiO2/PLA复合纳米纤维膜对大肠杆菌和金黄色葡萄球菌表现出良好的抗菌性能,当TiO2含量为1%时,对两种菌的抑菌率分别达到92.9%和92.2%。     

纳米二氧化钛抗菌包装用纸的性能研究

目的研究不同种类以及不同质量分数的纳米TiO_2抗菌剂对包装用纸抗菌效果和物理力学性能的影响。方法向抗菌纸表面涂布纳米TiO_2抗菌剂悬浮液,并进行干燥处理,再进行抗菌性能及物理力学性能测试,研究纳米TiO_2对抗菌纸抗菌性能和物理力学性能的影响。结果纳米TiO_2抗菌纸对金黄色葡萄球菌和大肠杆菌均有抑制作用,不同种类的纳米TiO_2抗菌纸达到最佳抗菌效果的浓度值不同;此外,纳米TiO_2抗菌剂对于纸张的白度、耐折度、撕裂度和耐破度无显著影响。结论纳米TiO_2抗菌纸在保持原有物理力学性能的基础上,可有效抑制细菌的繁殖生长,可作为具有抗菌效果的包装用纸推广使用。     

多糖-植物蜡-纳米二氧化硅防水防油包装纸制备与性能

随着社会的发展，人们对无毒环保食品包装材料的需求不断增加。现阶段，兼顾防水防油性能的无氟食品包装纸研究较少。本文以壳聚糖溶液与海藻酸钠溶液为原料，通过阿魏酸交联制备复合防油剂，并涂布在食品包装原纸上，制备防油纸；然后以巴西棕榈蜡与纳米二氧化硅为原料，制备复合防水剂，采用浸渍的方法，制备防水防油纸，探究不同配比及涂布量对纸张防水防油效果与纸张性能的影响。结果表明：当壳聚糖与海藻酸钠复配质量比为8∶2、涂布量为4 g/m²时，防油纸可达到最高防油等级(12级)；当巴西棕榈蜡与纳米二氧化硅复配质量比为4∶3、浸渍量为3 g/m²时，纸张表面吸水量(Cobb)值为5.93 g/m²，水接触角为158.40°，显著提升了原纸的防油性能与防水性能。此外，与未涂布纸相比，防水防油纸的抗张强度提升了30%，透气度下降了60%。本文制备工艺简单、原材料无氟环保、纸张防水防油性能较好，有望在食品包装得到应用。     

镁合金Ni-Cu-P/纳米TiO2化学复合镀层性能探究

对镁合金表面化学镀Ni-Cu-P进行改进,在其镀液中加入纳米粒子TiO2,在镁合金AZ91D上获得耐磨耐蚀性能优良且兼具有抗菌性能的化学复合镀层.对此镀层表面形貌、组织结构、抗菌、耐磨、耐蚀性能进行了分析,结果表明:该镀层均匀、致密,结合力优良;Ni-Cu-P/纳米TiO2化学复合镀层磨料磨损最佳耐磨性是基材的1.69倍,粘着磨损最佳耐磨性是基材的1.63倍;耐氯化钠和醋酸溶液腐蚀结果均显示该镀层具有较好的耐蚀性;抗菌性能中最佳杀菌率为99.7%,达到了理想的效果.     

CNC−CTS复合阴离子淀粉表面涂布剂对牛皮纸印刷适性的影响

目的 采用改性环境友好型涂料对牛皮纸表面进行涂布，以改善其水性油墨柔性版印刷效果。方法 采用表面涂布法，使用15 μm的线棒，以42 mm/s的速度，在牛皮纸表面均匀涂布纳米纤维素(CNC)复合壳聚糖(CTS)阴离子淀粉涂料，然后对涂布前和涂布后的牛皮纸水性油墨的印刷适性进行对比分析。结果 与未涂布牛皮纸相比，涂布后牛皮纸的平滑度提高了约28.6%，光泽度提高了近1倍，撕裂度提高了约19.3 %，耐折度提高了约15.2 %，吸水性由196.2 g/m²降至174.2 g/m²，印刷图文的密度得到显著提高，耐摩擦性较好，同时还提高了牛皮纸的抗菌性。结论 CNC−CTS阴离子淀粉涂料可以在不增加环境压力的情况下，有效提高牛皮纸的撕裂度、耐折度等力学性能，平滑度、光泽度等光学性能，以及抗水性和抗菌性，从而提高了印刷图文的印刷密度、耐摩擦性，以及印刷品的抗霉菌能力。     

纳米氯化银/壳聚糖抗菌敷料的制备及功能评价

以壳聚糖纤维为基底材料,经表面处理,采用硝酸银多步浸渍和快速氯化反应的方法,制备均匀嵌合纳米氯化银颗粒的壳聚糖纤维复合抗菌敷料。银负载量小于60mg/10*10cm2时,壳聚糖纤维表面可观察到均匀的氯化银纳米粒子,粒径分布20~80nm。氯化银纳米粒子结构和抑菌性具良好的稳定性,对大肠杆菌、金黄色葡萄球菌和绿脓杆菌的抑菌率均可达到99.99%。氯化银纳米粒子在经预处理的壳聚糖纤维表面具有良好的固着性。纳米氯化银/壳聚糖纤维供试样品对深二度烧伤伤口愈合没有不良作用,相对于生理盐水/纱布和磺胺吡啶银/纱布对照组,供试样品组的愈合率更高。本研究成果为新型氯化银抗菌敷料研发提供了重要依据。     

壳聚糖双胍盐酸盐抑菌剂的合成及在包装上的应用

以壳聚糖和双氰胺为原料,制备了应用于肉禽类包装的壳聚糖双胍盐酸盐抑菌剂。利用正交实验优化设计了制备壳聚糖双胍盐酸盐的工艺条件,发现当盐酸浓度为0.40 mol/L,反应官能团物质的量比为1∶5,反应时间为20 min时,产物产率达到92.96%。红外光谱证明,壳聚糖的氨基和双氰胺的氰基已进行了亲核加成反应,合成了双胍产物壳聚糖双胍盐酸盐;抑菌试验表明,壳聚糖双胍盐酸盐的抑菌性明显优于壳聚糖,且对金黄葡萄球菌的抑菌性优于对大肠杆菌的抑菌性。加入10%(质量分数)抑菌剂的聚乙烯醇复合膜,对大肠杆菌和金黄葡萄球菌的抑菌率分别达到95.67%和97.45%。     

Effect of surface fluorination of TiO2 particles on photocatalitytic activity of a hybrid multilayer coating obtained by sol-gel method

A multilayer photoactive coating containing surface fluorinated TiO(2) nanoparticles and hybrid matrices by sol gel approach based on renewable chitosan was applied on poly(lactic acid) (PLA) film by a step wise spin-coating method. The upper photoactive layer contains nano-sized functionalized TiO(2) particles dispersed in a siloxane based matrix. For the purpose of improving TiO(2) dispersion at the air interface coating surface, TiO(2) nanoparticles were modified by silane coupling agent 1H,1H,2H,2H-perfluorooctyltriethoxysilane (FTS) with fluoro-organic side chains. An additional hybrid material consisting of chitosan (CS) cross-linked with 3-glycidyloxypropyl trimethoxy silane (GOTMS) was applied as interlayer between the PLA substrate and the upper photoactive coating to increase the adhesion and reciprocal affinity. The multilayer TiO(2)/CS-GOTMS coatings on PLA films showed a thickness of ~4-6 μm and resulted highly transparent. Their structure was exhaustively characterized by SEM, optical microscope, UV-vis spectroscopy and contact angle measurements. The photocatalytic activity of the multilayer coatings were investigated using methyl orange (MeO) as a target pollutant; the results showed that PLA films coated with surface fluorinated particles exhibit higher activity than films with neat particles, because of a better dispersion of TiO(2) particles. The mechanical properties of PLA and films coated with fluorinated particles, irradiated by UV light were also investigated; the results showed that the degradation of PLA substrate was markedly suppressed because of the UV adsorptive action of the multilayer coating.     

Packaging‐related properties of protein‐ and chitosan‐coated paper

The mechanical and gas‐barrier properties of paper and paperboard coated with chitosan–acetic acid salt (chitosan), whey protein isolate, whey protein concentrate and wheat gluten protein were studied. Paper sheets were solution‐coated using a hand applicator. In addition, bi‐layer composites of wheat gluten and paper or paperboard were produced by compression moulding, and the chitosan solution was also applied on paperboard using curtain coating. Young's modulus, fracture stress, fracture strain, tearing strength, air permeance and oxygen permeability were assessed. The mechanical and air permeance measurements of solution‐coated paper showed that chitosan was the most effective coating on a coat weight basis. This was due to its high viscosity, which limited the degree of penetration into the paper. The proteins, however, also enhanced the strength and toughness of the paper. Compression‐moulded wheat gluten/paper or paperboard, as well as curtain‐coated chitosan paperboard laminates, showed oxygen barrier properties comparable to those of paper and paperboard coated with commercial barrier materials. None of the composites could be delaminated without fibre rupture, indicating good adhesion between the coatings and the substrates. Copyright © 2005 John Wiley & Sons, Ltd.     

纳米和微米TiO_2对铜版纸涂层性能的影响

利用红外光谱（FT-IR）、X射线粉末衍射（XRD）和热失重（TG）等分析手段对纸张涂料用纳米TiO2样品进行了表征,并与微米TiO2的微晶结构进行比较研究。FT-IR和TG分析结果确证了改性纳米TiO2表面包覆约有12.43%的有机改性剂。对比研究发现TiO2微晶纳米化后,由Ti—O—Ti键的晶格振动引起的620cm-1附近强而宽的吸收峰出现约40cm-1的蓝移现象。制备了纳米TiO2改性纸张涂料,对纳米粒子改性的铜版纸涂层性能进行了探讨。实验结果表明随着改性纳米TiO2用量的增加,铜版纸的白度大大提高,铜版纸的表面强度改善尤为明显,当改性纳米TiO2用量为10%时,纸张涂层的表面强度提高15%以上。但是,不断增加改性纳米TiO2用量,涂料空隙基本被颗粒细小的纳米粒子所占据,铜版纸的平滑度呈现急剧下降趋势。     

铜掺杂纳米 TiO2 的制备及其抗菌性能研究

目的制备铜掺杂纳米二氧化钛抗菌材料,测定其金属溶出率,研究该材料的光催化活性及抗菌性能。方法通过水热合成法制备掺铜二氧化钛(TiO_2Cu)纳米材料,采用催化动力学法测定该材料Cu~(~(2+))溶出率,以亚甲蓝为光催化降解材料测定其光催化活性,以金黄色葡萄球菌为目标物,研究在紫外光和非光条件下TiO_2Cu纳米材料的抗菌性能。结果 TiO_2Cu纳米材料Cu~(2+)溶出率最大值为72.36%,在自然光和紫外灯光照下对亚甲蓝光催化降解率分别为95.06%和85.08%,光照下TiO_2Cu材料质量浓度达到10 mg/m L,与细菌共培养90 min后,抑菌率可达94%。结论采用冷冻干燥法制备的含铜量为0.2%的TiO_2Cu材料具有良好的光催化活性,在暗光和紫外光照下均具有一定的抗菌性能。     

二氧化钛-二氧化硅复合材举制备研究及应用

对TiO2-SiO2复合材料的的制备方法进行了综述，同时讨论了在化妆品、涂料、食品抗菌、光催化、亲水薄膜等方面的应用，总结了针对不同的使用目的进行的TiO2包覆SiO2、TiO2包覆SiO2、TiO2与SiO2相互交联反应，并对其机理和应用进行了简单的介绍。     

Antibacterial hydroxyapatite/chitosan complex coatings with superior osteoblastic cell response

Chitosan was widely used as an antibacterial component. While most antibacterial materials also possess cytotoxicities, we hypothesize that selectively destruction of bacterial cells can be achieved by controlling the material parameters of chitosan, due to its intrinsic antibacterial mechanism. In this study, porous hydroxyapatite coatings prepared by the liquid precursor plasma spraying process were used for loading the chitosan with different concentrations: 10, 20, 50, and 100 g/L, respectively. The antibacterial properties and osteoblastic cell response of the hydroxyapatite/chitosan complex coatings were studied as a function of chitosan concentration. The results indicated that the antimicrobial activity was directly proportional to the chitosan concentration, while loading of chitosan with lower concentrations (10 and 20 g/L) was even beneficial to the proliferation of osteoblastic cells. Overall, our study demonstrated that combined antibacterial activity and superior osteoblast cell response can be achieved by using hydroxyapatite/chitosan complex coatings, which have great potential in bone replacement and regeneration applications.     

Antibacterial Properties and Corrosion Resistance of Nitrogen-doped TiO_2 Coatings on Stainless Steel

The Nitrogen-doped TiO2 (N-TiO2) coatings were fabricated on 304 austenitic stainless steel (SS) substrates by oxidation of titanium nitride coatings,which were prepared by plasma surface alloying technique.Microstructural investigation,corrosion tests and antibacterial tests were conducted to study the properties of N-TiO2 coatings.Composition analysis shows that the SS substrates were shielded by the N-TiO2 coatings entirely.The N-TiO2 coatings are anatase in structure as characterized by X-ray diffraction.The corrosion properties of N-TiO2 coated SS samples in Hanks’ solution were investigated by a series of tests.The electrochemical measurements indicate that the corrosion potential positively shifts from 0.275 V for untrated SS to 0.267 V for N-TiO2,while the corrosion current density decreases from 1.3×105 A/cm to 4.1×10 6 A/cm2.The corrosion resistance obtained by fitting the impedance spectra also reveals that the N-TiO2 coatings provide good protection for SS substrate against corrosion in Hanks’ solution.Electrochemistry noise tests indicate that the N-TiO2 coatings effectively retard the local pitting and crevice corrosion of the SS substrate.The results of the antibacterial test reveal that N-TiO2 coatings give 304 austenitic SS an excellent antibacterial property.