Fabricating a reactive surface on the fibroin film by a room-temperature plasma jet array for biomolecule immobilization

A simple dielectric barrier discharge(DBD) jet array was designed with a liquid electrode and helium gas.The characteristics of the jet array discharge and the preliminary polymerization with acrylic acid(AA) monomer were presented.The plasma reactor can produce a cold jet array with a gas temperature lower than 315 K,using an applied discharge power between 6 W and 30 W(V dis × I dis).A silk fibroin film(SFF) was modified using the jet array and AA monomer,and the treated SFF samples were characterized by atomic force microscopy(AFM),scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FTIR),and contact angle(CA).The deposition rate of the poly acrylic acid(PAA) was able to reach 300 nm/min,and the surface roughness and energy increased with the AA flow rate.The FTIR results indicate that the modified SFF had more carboxyl groups(-COOH) than the original SFF.This latter characteristic allowed the modified SFF to immobilize more quantities of antimicrobial peptide(AP,LL-37) which inhibited the Escherichia coli(E.Coli) effectively.     

二维光子晶体结构参量对光子禁带特性的影响

用多重散射法研究了二维光子晶体的结构参量对光子禁带特性的影响。发现光子晶体的晶格常数(d)和组成晶体的介质柱的半径(r)都能同样有效地改变光子禁带的位置,仅改变d时,填充系数ρ降低时光子禁带区Ω向低频区移动,而仅改变r时,ρ增加时Ω向低频区移动。在较宽的参量范围内,Ω的中心频率单独随r增加而线性下降的速度是单独随(,增加而线性下降的速度的2倍。ρ取特定值时,Ω的相对宽度取极大值,其中1次Ω只有1个极大值,而2次Ω存在2个极大值,且2次Ω极大值对应的2个ρ值中有一个刚好是1次Ω极大值对应的ρ值的2倍。     

对粤教版高中《 物理·选修3 3》表面张力 部分教学的思考

对粤教版高中《 物理·选修3 3》 表面张力部分进行了分析, 并结合教学实践对学生产生的疑惑及误解 进行了辨析     

Surface diffuse discharge mechanism of well-aligned atmospheric pressure microplasma arrays

A stable and homogeneous well-aligned air microplasma device for application at atmospheric pressure is designed and its electrical and optical characteristics are investigated. Current-voltage measurements and intensified charge coupled device(ICCD) images show that the well-aligned air microplasma device is able to generate a large-area and homogeneous discharge at the applied voltages ranging from 12 kV to 14 kV, with a repetition frequency of 5kHz, which is attributed to the diffusion effect of plasma on dielectric surface. Moreover, this well-aligned microplasma device may result in the uniform and large-area surface modification of heat-sensitive PET polymers without damage, such as optimization in hydrophobicity and biocompatibility. In the biomedical field, the utility of this well-aligned microplasma device is further testified. It proves to be very efficient for the large-area and uniform inactivation of E. coli cells with a density of 103/cm~2 on LB agar plate culture medium, and inactivation efficiency can reach up to 99% for 2-min treatment.     

温度不敏感偏振无关电光调制器设计

 利用LiNbO3晶体电光系数之间的关系,提出一种全新的温度不敏感偏振无关电光调制器。该调制器采用2块LiNbO3晶体紧密相贴的结构,2块晶体加同一横向电压,电极设计和制作相当简单,无偏振片,无偏振损耗。采用线性电光效应的耦合波理论对光在调制器中的传播进行研究,理论计算表明：光通过调制器后,其输出强度不依赖于入射光的偏振状态;另外,数值计算结果表明：当温度在-20℃到60℃之间变化时,调制器输出光强的扰动不超过1.5%。     

Characteristics of sealed plasma electrolytic oxidation coatings with electrochemical impedance spectroscopy

<正>Plasma electrolytic oxidation(PEO) coatings are prepared on aluminium with graphite powders added into the electrolyte.The scanning electron microscopy(SEM) coupled with an energy dispersive x-ray analysis system(EDX) is used to characterize the surface and the cross-section morphologies of the coatings.The electrochemical impedance spectroscopy(EIS) is used not only to evaluate the corrosion resistance but also to analyse the structure of the coating. Results show that graphite powders are embedded in the PEO coating.The corrosion resistances of both the inner barrier and the outer porous layer are greatly improved,and the EIS could give some valuable detailed information about the coating structure.     

柱前衍生化-高效液相色谱法分析缅甸刺梧桐胶多糖的单糖组成

利用1-苯基-3-甲基-5-吡唑啉酮柱前衍生化-高效液相色谱法,优化10种常见单糖的色谱分离条件,并用于不同等级的自制刺梧桐胶多糖的单糖组成分析.对自制刺梧桐胶多糖的单糖组成分析结果表明,自制刺梧桐胶多糖由葡萄糖醛酸(GlcUA)、鼠李糖(Rha)、半乳糖醛酸(GalUA)、半乳糖(Gal)、阿拉伯糖(Ara)和岩藻糖...     

内表面栅极等离子体源离子注入TiN薄膜及其特性研究

阐述了栅极增强等离子体源离子注入（GEPSII）方法的基本思想.利用GEPSII方法在45号钢 基底上生成了金黄色氮化钛（TiN_x）膜.对不同条件下的TiN膜做电化学腐蚀，X PS，AES， XRD等分析.电化学腐蚀实验显示TiN薄膜改善了45号钢的耐腐蚀性能5—10倍，且在高气压下 效果更好.结构分析显示TiN膜含有TiO₂，TiN成分，主要沿（111）和（200）晶 向生长，深度分析显示膜的厚度只有二十几纳米，膜质地均匀且在基底有一定的嵌入深度. 关键词： 腐蚀 等离子体源离子注入 薄膜 氮化钛     

沉淀介质对共沉淀法制备（Bi，Pb）2223先驱粉的影响

本文利用物理化学原理对改进的共沉淀法和传统的共沉淀法所使用的介质进行了对比研究．通过比较PH值在以水为介质的传统共沉淀法和改进的以乙醇为介质的共沉淀法的化学计量比的不同影响，我们发现传统共沉淀法不能找到合适的PH值范围来使各种金属离子完全共沉淀，也就难以维持原始的化学计量比，而改进的共沉淀法有很宽的PH值范围（PH=3～7．4），能使所要沉淀的各种金属离子完全共沉淀并维持原始的化学计量比．对改进的共沉淀法制备的前驱粉经过X光衍射分析显示，其相组成合适．扫描电镜分析显示前驱粉完全满足制备超导（Bi，Pb）2223带材的需要．     

FTIR监测金刚石薄膜生长的研究

用电子回旋共振等离子体（ECR）系统, 在气压、衬底温度以及微波功率等外界条件不变的情况下,仅改变甲烷浓度制备金刚石薄膜,利用傅里叶红外吸收光谱仪（FTIR）对甲烷浓度为6％的ECR系 统进行实时监测,分析研究了不同沉积时间条件下,甲烷和氢气产生的等离子体对薄膜早期成核、生长过程以及衬底的影响,并结合Raman光谱X射线衍射（XRD）和扫描电镜（SEM）对金刚石薄膜进行 了分析。