织物基UHF-RFID标签天线的制备及封装工艺初探

以常见的服装水洗唛为基材,采用丝网印刷方式印制超高频射频识别(ultra high frequency-radio frequency identification,UHF-RFID)标签天线,并与芯片连接封装制备标签,探讨丝网印刷天线的网板目数、不同类型导电油墨和天线/芯片连接封装的热压温度对印刷质量和标签读取性能的影响。试验结果表明:网版目数为300目的标签天线的印刷精度和尺寸稳定性优于350目的丝印网版;当采用8000A型导电银浆时,标签性能满足读取要求,读取距离在8 m以上;为保证标签天线与芯片形成稳定的电连接,从而使所制备的标签读取距离及外观性能最佳,连接封装时热压温度应与天线印刷固化温度一致。     

Physico-Chemical Properties of a Water-Insoluble Silk Fibroin Film

The conventional silk fibroin(SF)films obtained by casting from SF aqueous solution are amorphous,and easily dissolved in water.This defect limits the practical use of SF films in biomedical field.A new water-insoluble silk fibroin film(an SF-FA film)could be simply prepared by casting from SF formic acid solution.The physical properties and moisture permeability of SF-FA films were examined.The results show that the SF-FA film swollen in water exhibits outstanding pliability.The weight loss of SF-FA films ...     

高含量再生丝素蛋白水溶液的热性能研究

用差示扫描量热仪(DSC),对不同含量的再生丝素蛋白水溶液(质量分数为12%~42%),以及同一含量不同剪切速率(1 000 s-1和2 000 s-1)下溶液热性能的变化进行了对比研究。结果表明,随着含量的增大,再生丝素蛋白水溶液发生相转变的温度逐渐降低;同样,经剪切后的溶液发生相转变的温度均向低温漂移,且随着剪切作用的加强,向低温的漂移越明显。试验表明,丝素水溶液含量的增加和剪切作用可加速溶液从无规线团或α-螺旋向β-折叠构象的转变速度,且随着剪切速率的提高,构象转变的速度也加快。     

基因重组蛛丝蛋白仿生纤维的制备研究

以甲酸为溶剂,制备质量浓度为70 g/mL基因重组蛛丝蛋白纺丝液.分别以甲醇、硫酸铵为凝固浴,经一段拉伸、二段拉伸制备仿生纤维,分析仿生纤维的水溶性、密度、比强度等物理和机械特性,并考察加入高分子材料聚乙烯醇及纤维后处理对纤维性能结构的影响.     

几种玉米须黄酮分子结构性质及抗氧化活性的量子化学研究

采用理论计算化学手段结合分子动力学与量子化学方法,对玉米须相关的几种黄酮类化合物槲皮素、木犀草素、芹菜素分子结构和活性进行了理论计算.从几何结构、自由基稳定性、前线轨道能等角度分析了影响黄酮类化合物抗氧化活性的因素.在分子层面上探讨了玉米须黄酮的抗氧化作用机理,预测的黄酮类化合物的抗氧化活性与实验结果一致.     

Structure and Properties of Porous Silk Fibroin Materials

In this article the structure and properties of freeze-dried porous silk fibroin materials were tested and analyzed.The results indicated that for porous silk fibroin materials prepared by means of freeze-drying,if freez-ing temperature was below —20℃,the structure of silk fibroin was mainly amorphous with a little silk Ⅱ crystal structure,and if freezing temperature was above —20℃,quite a lot of silk Ⅰ crystal structure formed.Porous silk fibroin materials,with average pore diameter be-     

再生丝素固体的微细结构

研究了蚕丝丝素水溶液经不同方式干燥后，所得到的再生丝素固体的微细结构，以及存放过程中丝素的结构变化，指出经30℃热风干燥或经高于－20℃冷冻干燥后，所得到的丝素固体的结构是无定形和Silk I共存，在室内温度湿度环境中存放后，部分无定形结构转化为Silk I；蚕丝丝素水溶液经－80－－20℃冷冻干燥后，所得到的丝素膜的结构主要是无定形，含少量Silk II，存放过程中部分无定形结构转化为SilkI；室温放所自然形成的丝素凝胶中，丝素的结构是无定形和Silk Ⅱ共存；丝素水溶液表面膜中甘氨酸和丙氨酸的含量较高，表面膜的结构主要是Silk I和Tilk Ⅱ结晶度高。     

Biological and mechanical investigation of novel flax/silk protein-based nanofibrous scaffold for bone regeneration

The process of bone tissue regeneration involves an intricate network of a biological macromolecules that includes proteins and peptides to support stimulation and healing response. Here, we have fabricated a novel flaxseed/silk fibroin based (dual protein) composite nanofibers using β-TCP to improve the biological properties and promote cartilage tissue regeneration along with a controllable rate of biodegradation. The physiochemical properties of PVA/β-TCP/FP:SF were characterized by FTIR, XRD, SEM, porosity, contact angle measurements and mechanical evaluation etc. This study demonstrates the biological performance of the developed nanofibers by using hemocompatibility, biodegradation ability, and apatite deposition in stimulated body fluid. Moreover, the cell viability assay was performed on MG-63 osteoblast cells and long-term antibacterial rate against E. coli and S. aureus was analysed. Docking results of flax protein and silk fibroin protein further confirmed the stable modes of intramolecular bonding and the most stable electrostatic values using theoretical calculations. Taken together, the experimental results proved that the dual protein-based fibrous scaffold was found to be up-regulated in terms of biological activity with enhanced cell adhesion and proliferation.     

Control of Deposition Processes and Structures of Fibroin Nanofilms by IR Pulsed Laser Ablation

1 Results Protein thin films gather increasing interests in various biomedical-related materials including surface treatment of implants and bio-tips.Processes via colloid chemical routes such as simple adsorption,dip-or spin coating enable formation of protein thin films on various substrates.Related methods are facile andconvenient without sophisticated instrumentation but not without restriction.Typical drawbacks are limited solubility of the film-forming species and wettability determined by the com...