UV光引发表面接枝两性离子水凝胶层的制备及抗细菌黏附性能

采用聚合和交联的SiO₂有机/无机杂化溶胶作为基材, 通过与两性离子单体层之间的过渡层, 在紫外光作用下引发杂化溶胶和两性离子单体溶液中的双键反应, 使生成的杂化层在基材和表面的两性离子聚合物之间形成辅助性黏接作用, 从而在基材表面构筑两性离子水凝胶层. 通过傅里叶红外光谱(FTIR)、 原子力显微镜(AFM)和接触角测试等方法对所制备的两性离子水凝胶层和杂化层的表面进行了表征. 以空白玻璃片为对照样品, 以金黄色葡萄球菌和大肠杆菌为试验菌, 研究了用两性离子凝胶层修饰的玻璃表面的抗细菌黏附性能. 结果表明, 在SiO₂杂化过渡层中引入线型-Si-(CH₂)₂-O-链段可有效提高杂化过渡层对基材的附着力, 并改善其柔韧性. 与对照样品相比, 用两性离子凝胶层修饰的玻璃表面具有优异的抗菌黏附性能.     

基于一维双螺旋链的锌配合物的合成与荧光性能

选择配体N,N'-双(3-吡啶)丙二酰胺(3-bpma)、1,4-对苯二乙酸(H₂pda)和硝酸锌在水热条件下,自组装制备了一个基于双螺旋链的三维超分子锌配合物[Zn(3-bpma)(pda)]_n(1),并通过红外光谱、元素分析、热重分析和X射线单晶衍射分析进行了晶体结构表征。 单晶结构分析表明标题锌配合物是正交晶系,Pna21空间群,晶胞参数a=1.62512(11) nm,b=1.15947(8) nm,c=1.19282(8) nm,α=90°,β=90°,γ=90°,V=2.2476(3) nm³,M_r=513.80,D_c=1.518 g/cm³,Z=4,F(000)=1056,R₁=0.0381,wR₂=0.0669。 金属锌离子被两种桥连配体3-bpma和pda连接形成一种一维双螺旋链状结构,相邻的链间进一步通过氢键作用拓展成为三维超分子网络结构。 标题锌配合物具有强荧光发射特性,而且其对不同的有机溶剂分子和金属离子有显著的荧光传感特性,可以作为检测硝基苯的高灵敏性荧光传感材料。 CCDC:1811967     

超声刻蚀法构建分级结构的超疏水表面

在湿法刻蚀和超声空化的基础上, 采用超声刻蚀法制备了具有微纳米分级结构的超疏水表面. 以等体积比的硝酸/乙醇(体积分数为4%)和双氧水(质量分数为30%)的混合溶液作为刻蚀剂, 在室温下对60Si2Mn钢、 60^#钢、 T10钢、 Cr06钢、 65Mn钢和硅钢表面超声刻蚀2~10 min, 构建出多种形貌的微纳米分级结构. 上述表面经氟硅烷修饰后具有超疏水性, 水的表观接触角高达157.0°, 155.8°, 157.4°, 154.9°, 157.6°和156.8°, 滚动角分别为6.5°, 19.2°, 6.1°, 7.8°, 6.7°和7.2°. 与常规刻蚀方法相比, 超声刻蚀的化学刻蚀作用因与空化作用耦合而得到强化和改变, 从而在钢表面构建出分级结构. 由于材料表面微结构形貌和固/液界面接触状态不同, 制得的超疏水表面表现出的润湿行为也不同. 超声刻蚀法简单易行, 成本低廉, 适用于其它金属表面构建微纳米分级结构和超疏水表面.     

OTS自组装单分子膜在玻璃表面形成程的AFM研究

运用原子力显微镜研究了十八烷基三氯硅烷在玻璃表面自组装形成单分子膜的过程.通过对样品表面的显微图像、表面平均粗糙度及前进接触角的测量分析,揭示了自组装单分子膜在玻璃表面的生长规律,并探索反应初期玻璃表面的吸附特点.     

单宁酸/两性离子改性油-水分离膜的制备及性能

以不锈钢网为基材, 利用单宁酸对不锈钢网进行表面预处理并功能化接枝两性离子基团, 制备了新型亲水和水下超疏油的单宁酸/两性离子改性油-水分离膜(TA-ZW-SSM). 利用X射线光电子能谱仪(XPS)、 扫描电子显微镜(SEM)及接触角测量仪等表征了其化学结构、 形态和润湿性. 研究结果表明, 两性离子基团通过化学键接枝在单宁酸预处理的不锈钢网表面. 油-水分离实验结果表明, 对于不同类型的油-水混合物, 本文制备的超亲水和水下超疏油特性的TA-ZW-SSM可实现重力驱动的高效油-水分离, 并具有较好的化学稳定性及再循环性.     

OTS自组装单分子膜在玻璃表面形成过程的AFM研究

运用原子力显微镜研究了十八烷工碱氯硅烷在玻璃表面自组装形成单分子膜的过程。通过对样品表面的显微图像,表面平均粗糙度及前进接触角的测量分析,揭示了自组装单分子膜在玻璃表面的生长规律,并探索反应初期玻璃表面的吸附特点。     

基于分子间卤键的超分子平面大环自组装

本工作报道了含卤键供体和受体片段的三种芳酰胺分子(化合物1~3)的设计和合成, 并对固相中卤键的不同作用模式进行了探索和分析. 化合物1的晶体数据显示, 由于没有分子内氢键, 组成分子的三个芳环相互扭转一定角度, 并且在分子间交替排列的N···I和O···I卤键的控制下, 组装成了一条线型的超分子组装体. 由于酰胺羰基和两个紧邻的氟原子之间的排斥作用, 化合物2未能形成分子内三中心氢键. 在此基础上, 将三氟碘代苯作为卤键供体片段引入到化合物3中, 并且在折叠体骨架中嵌入了嘧啶单元. 化合物3的晶体数据显示, 基于多组有效的分子内三中心氢键和分子间较强的卤键作用, 双分子间形成了[1+1]的超分子大环. 另外, 由于嘧啶环的引入, 使得该超分子大环接近共平面.     

基于聚琥珀酰亚胺衍生物仿生超亲水表面的制备及性能

利用对聚琥珀酰亚胺(PSI)的亲核加成反应,仿生设计合成侧基带有多巴胺和磺酸甜菜碱两性离子基团的新型聚琥珀酰亚胺衍生物(PSI-DA-ZW);通过聚琥珀酰亚胺衍生物中多巴邻苯二酚基团的氧化自聚和沉积,制备了仿生超亲水功能涂层表面(PSI-DA-ZW/glass).利用X射线光电子能谱仪(XPS)、扫描电子显微镜(SEM...     

基于L/D-赖氨酸盐酸盐和光活化AIE分子共组装实现圆偏振发光及动态调控

近年来, 基于分子组装产生圆偏振发光(CPL)的有机手性材料得到了迅猛的发展. 然而, 目前有机材料体系的CPL信号整体仍然较弱, 且缺乏精准的调控手段. 为此, 本工作以具有光活性的聚集诱导荧光增强(AIE)性质的多硫苯基化合物(M-1)为荧光染料, 以手性氨基酸L/D-赖氨酸盐酸盐(L/D-Lys)为手性模板, 通过分子间氢键作用, 在N,N-二甲基甲酰胺(DMF)/H₂O的混合溶剂中形成超分子L/D-Lys@M-1共组装体. 共组装体在不良溶剂水的溶剂作用下诱导产生CPL, 且在紫外光激发下具有自聚集效应, 产生持续增强的荧光发射和圆二色(CD)信号. 通过荧光光谱、紫外吸收光谱和动态光散射(DLS)对组装体在光激发下的结构和光物理性质进行表征, 利用CD光谱以及CPL光谱等对基态和激发态手性性质进行研究. 结果表明, 在溶剂诱导和光激发下实现了L/D-Lys@M-1组装体的手性传递和放大, 且不对称因子(|g_lum|)达到了0.3×10^-2. 该研究策略为非手性的荧光分子构建CPL体系及动态调控提供了策略.     

水黾多腿并排表面的疏水性能

通过体视显微镜、 扫描电子显微镜、 傅里叶变换红外光谱对水黾腿表面的形态、 结构和成分进行了定性定量研究, 采用视频光学接触角测量仪以及Cassie模型对水黾多腿并排的表面润湿性能进行了测量与分析. 结果表明, 水黾腿表面均匀分布有刚毛, 刚毛表面有螺旋状沟壑; 水黾多腿并排后的表面接触角达(152.9±1.0)°, 表明该表面具有超疏水性; Cassie模型计算结果表明, 水黾多腿并排后的超疏水性是其腿部表面有机物质和表面微观结构耦合作用的结果, 并排测量方式对其影响较小.     

Surface modification of SPEU films by ozone induced graft copolymerization to improve hemocompatibility

Surface modification of segmented poly(ether urethane) (SPEU) by graft copolymerization with N,N′-dimethyl-N-methacryloyloxyethyl-N-(3-sulfopropyl) ammonium (DMMSA), a zwitterionic sulfobetaine structure, was conducted. A simple two-step procedure for grafting of DMMSA onto the surface of SPEU film was used. The surface was first treated with ozone to introduce active hydroperoxide groups. The active surface was then exposed to the DMMSA solution in the sealed tube. Grafted SPEU film was characterized by ATR–FTIR, XPS and contact angle measurement. ATR–FTIR and XPS investigations confirmed the graft copolymerization. The monomer concentration, copolymerization temperature and time were varied to maximize the efficiency of DMMSA grafting. The equilibrium water content (EWC) and contact angle measurements showed that the hydrophilicity of the film had been greatly improved. The blood compatibility of the grafted films was evaluated by platelet adhesion in platelet rich plasma (PRP), deposits in blood control and protein adsorption in bovine fibrinogen using SPEU film as the control. No platelet adhesion and no thrombus were observed for the grafted films incubated in PRP for 300 min and in blood for 120 min, respectively. The protein adsorption was reduced on the grafted films after incubation in bovine fibrinogen for 120 min. These results proved that improved blood compatibility was obtained by grafting this new zwitterionic sulfobetaine structure monomer onto SPEU film.     

海藻糖改性聚乙烯醇及其防雾/防霜涂层

以聚乙烯醇和羧基化海藻糖为原料合成了聚乙烯醇-g-海藻糖(PVA-g-Tre), 将接枝物与少量乙二醇二甲基丙烯酸酯混合, 通过光引发聚合制备了亲水性半互穿网络防雾/防霜涂层. 通过核磁共振氢谱和傅里叶变换红外光谱对PVA-g-Tre的化学结构进行了表征, 利用原子力显微镜、 水接触角测试仪、 拉曼光谱等分析了涂层表面的粗糙度、 润湿性及水与大分子之间的氢键作用, 并考察了涂层的透光性和防雾及防霜性能. 结果表明, 含有不同海藻糖接枝率PVA-g-Tre的涂层表面粗糙度较低且透光率好, 与含有PVA的涂层相比, 引入海藻糖提高了PVA-g-Tre涂层的亲水性和润湿性, 使其同时具有良好的防雾和防霜性能.     

Preparation of antifog and antibacterial coatings by photopolymerization

This paper contains a kind of ultraviolet‐cured antifogging and antibacterial coating. A quaternary ammonium salt (14QAS), which was synthesized in this paper, has been implemented as a monomer. The chemical structure of 14QAS has been confirmed by Fourier transform infrared spectroscopy and nuclear magnetic resonance. The nitrogen atom on the surface of the coatings with 14QAS was observed by X‐ray photoelectron spectroscopy. The Surface wettability of the polymer film was studied by contact angle analysis, which confirmed the hydrophilicity of the coatings with low water contact angle (~25°). The antifog properties were evaluated under different conditions. The antibacterial activity of coatings with 14QAS reached 99.9% against S. aureus and E. coli. Copyright © 2014 John Wiley & Sons, Ltd.     

Effect of ethylene glycol-bis(2-aminoethylether)-N,N,N′,N′-tetraacetic acid (EGTA) on the growth, stabilization and morphology of silver nanoparticles

The effect of ethylene glycol-bis(2-aminoethylether)-N,N,N′,N′-tetraacetic acid (EGTA) in stabilizing different shapes of silver nanoparticles have been examined by electronic absorption spectroscopy and transmission electron microscopy. The silver nanoparticles were prepared by two methods, i.e. γ-irradiation and chemical reduction method. Two types of effects of EGTA were identified which lead to the formation of truncated triangular silver nanoplates and chain—like silver aggregates respectively. Time-dependent infrared attenuated total reflectance (ATR-FTIR) studies showed that the nature of adsorption of EGTA on the silver nanoparticle surface influences the shape of the nanoparticles. Pulse radiolysis studies showed the mechanism of formation of the initial silver nanoclusters.     

一种阳离子Gemini型沥青乳化剂的合成及性能

以苯胺、环氧氯丙烷和十四烷基二甲基叔胺为原料,合成了含有苯环的阳离子Gemini型沥青乳化剂3,3'-苯基亚氨基-(二(2-羟基丙基-十四烷基二甲基)氯化铵)(G-T)。 采用傅里叶红外光谱(FT-IR)、质谱(MS)和核磁共振谱(¹H NMR)对产物进行了结构表征。 研究了其Krafft点、乳化性能和乳化沥青时的相关性能,并测定了25~40 ℃的临界胶束浓度(cmc)、平衡表面张力(γ_cmc)及计算了相应的热力学函数。 结果表明,G-T的Krafft点低于0 ℃,乳化分水时间为309 s。 25 ℃时,cmc为1.269×10^-3 mol/L,γ_cmc为38.33 mN/m。 随着温度的升高,cmc增大、γ_cmc减小、饱和吸附量(Γ_max)减小、极限占有面积(A_min)增大。 乳化沥青测试表明,G-T拌和时间为255 s,是慢裂型沥青乳化剂。 所制备的乳化沥青满足微表处技术规范。     

Physicochemical aspects of microbial adhesion — Influence of antibody adsorption on the deposition ofStreptococcus sobrinus in a parallel-plate flow chamber

Deposition of the oral bacteriumStreptococcus sobrinus HG977 onto glass (water contact angle 0°) and onto FEP-Teflon (fluoroethylenepropylene; water contact angle 110°) was studied in a parallel-plate flow chamber in the presence and absence of polyclonal antibodies (pAb) and monoclonal antibodies (mAbs) adsorbed onto the cells. The zeta potentials of the bacteria ranged from −7.1 to −8.5 mV at pH 6.8 and were not affected by the presence of pAb or mAbs. Hydrophobicity (by water contact angles) increased from 30° (no antibodies) to 88° in the presence of pAb adsorbed onto the bacterial cell surface. The untreatedS. sobrinus had a greater tendency to adhere to glass (44.5 × 10⁶ cm⁻²) than to FEP-Teflon (18.3 × 10⁶ cm⁻²), in accordance with thermodynamic modelling. After preincubation ofS. sobrinus with pAb, its clear preference for adhesion to glass disappeared as expected from its increased hydrophobicity. Although forS. sobrinus preincubated with OMVU10 no difference was found in hydrophobicity in comparison to the untreated bacteria, the number of bacteria adhering to glass decreased to 10.2 ¢ 10⁶ cm⁻². Formation of bacterial aggregates was found whenS. sobrinus, preincubated with pAb or OMVU10, adhered to glass and FEP. This was also observed when untreated bacteria adhered to glass coated with OMVU10, or to FEP coaled with OMVU10 or pAb. Adhesion in these experiments is therefore thought to occur via near-neighbour collection induced by the presence of pAb or mAbs. Low numbers of bacteria were removed from glass after draining the flow cell, whereas high numbers of untreated bacteria and bacteria preincubated with OMVU10 were removed from FEP.S. sobrinus cells preincubated with pAb were not removed but piled up. It was concluded that the adhesion of untreatedS. sobrinus andS. sobrinus preincubated with pAb is in accordance with thermodynamic modelling, based on the overall wettability of the cell surfaces, whereas the adhesion ofS. sobrinus preincubated with OMVU10 may be through localized interactions, not expressed in overall surface properties.     

采用层层自组装与光化学修饰法在聚氨酯表面固定生物多糖衍生物

采用层层自组装技术与光化学修饰方法相结合在聚氨酯材料表面固定生物多糖衍生物,首先合成具有光反应活性的叠氮壳聚糖,再在聚氨酯基材表面进行叠氮壳聚糖与香菇多糖硫酸酯的层层自组装,然后通过光化学反应对自组装多层膜修饰层进行交联,制备得到生物多糖衍生物层层自组装与光化学表面修饰的聚氨酯材料.通过红外光谱、X射线光电子能谱、水接触角测量仪、抗菌活性测试、溶血试验和血小板黏附测试等方法对被修饰聚氨酯材料的表面性能和生物性能进行了分析,测试结果表明修饰后的聚氨酯材料表面的亲水性和血液相容性得到改善,并且被修饰材料对大肠杆菌具有良好的抑制效果.