水性UV导电油墨的研制

以水合肼(N2H4·H2O)为还原剂,PVP(聚乙烯吡咯烷酮)为分散剂,通过液相化学还原硝酸银溶液制备用于导电填料的纳米银粉。以制备的银粉为填料,水性聚氨酯丙烯酸树脂为连接料,乙醇和去离子水为稀释剂并辅以其他助剂,制备出水性UV导电油墨。经SEM表征和纳米粒度及电位分析仪测试,纳米银粉的平均粒径为23.67 nm。最后测试了油墨的导电性能、耐摩擦性能以及附着力。结果表明:所研制的水性UV导电油墨的电阻率为3.5×10-4Ω·m,印制的电路板经过2 500次以上的反复摩擦后,导电性能无明显变化,印刷后墨膜经3M胶带撕拉,不发生脱落现象。     

铝和硼共掺杂ZnO陶瓷的制备、表征和性能研究

本文首先采用传统的无压烧结工艺制备了高密度导电的铝和硼共掺杂ZnO陶瓷（ABZO），采用相似的工艺合成了单掺铝的ZnO陶瓷（AZO），并对两种方法制备的样品进行了表征。研究了陶瓷的致密化行为、晶体结构、形貌、成分和电性能。结果表明，AZO陶瓷仅在1350℃烧结4h时获得相对密度最高为99.01%的陶瓷，但由于陶瓷中形成的绝缘ZnAl₂O₄相增多，电导率下降。而在1100℃时，ABZO陶瓷达到了98.84%的最大相对密度，比AZO陶瓷低250℃。随着烧结温度的升高和绝缘ZnAl₂O₄相的增加，ABZO陶瓷的电导率显著提高。     

基于五轴联动曲面3D打印设备的纳米银导电材料固化工艺研究

利用自主研发的五轴联动曲面3D打印设备,在曲面上打印导电图形。以纳米银导电墨水为实验材料,探究了烧结功率、扫描速度、扫描间隔对导电图形制品表面质量、烧结制品线条宽度、电导率等的影响。结果表明:在烧结功率为2 W、扫描速度为4 mm/s、扫描间隔为0.3 mm的条件下,导电图形表面光滑,烧结制品线条宽度合适,电导率最高。     

二次掺杂聚3,4-乙撑二氧噻吩分散体的制备及其在水性导电涂料中的应用

以甲基丙烯酸缩水甘油酯(GMA)接枝对苯乙烯磺酸钠(SS)与丙烯酸(AA)共聚物合成制备光敏性掺杂剂G-PSA,并以G-PSA为水性分散剂和电荷平衡掺杂剂制备PEDOT(聚3,4-乙撑二氧噻吩)/G-PSA,采用多羟基醇二次掺杂增强其导电性,并对其进行一系列表征分析。将其与水性丙烯酸乳液共混制备导电涂料。研究发现,对比商品级水性掺杂剂聚对苯乙烯磺酸钠(PSS),PEDOT/G-PSA薄膜经UV固化后形成交联网状结构,其耐水性和环境稳定性有较大的提高,同时也具有较高的电导率;由其制备的抗静电涂料具有良好的透明性、附着力与电导率。     

环境友好型纳米银／氟碳抗菌涂料的研究

采用纳米银粉为抗菌材料,水性氟碳乳液为基料,添加润湿荆、分散剂和消泡剂等助剂,制备抗菌涂料。该涂料性能优良,经灭菌率测试,含有0．03％纳米银粉的涂料在2h内的灭菌率达到90％。     

生物基高效脱墨剂的制备及应用研究

采用廉价及可再生的脂松香、椰子油酸、棕榈酸为原料,制备生物基脱墨剂,并应用于废纸脱墨。采用FT-IR对原料进行了表征,以正交试验法优化了生物基脱墨剂的制备工艺,探讨了生物基脱墨剂的最佳用量及脱墨性能,并与传统脱墨剂做脱墨性能对比。FT-IR结果表明,生物质原料中既有饱和的脂肪酸也有不饱和的脂肪酸。生物基脱墨剂优化的制备条件为时间30min、温度90℃、m（脂松香）：m（椰子油酸）：m（棕榈酸）为2.5：3.5：4.0、NaOH溶液的质量分数40%。生物基脱墨剂是一种高效脱墨剂,最适加入量为0.20%;在加入量为0.20%,浮选温度为40℃,浮选时纸浆质量分数1.0%,浮选pH值为9,浮选时间为20min时,脱墨后废纸浆白度可达58.67%（ISO）,残余油墨值达274.42mm²/m²,油墨去除率达57.81%;实际应用结果表明生物基脱墨剂的脱墨性能优于传统的S型和天小脱墨剂。     

巯基丙酸保护的纳米银制备及热分解行为研究

以双官能团配体巯基丙酸(MPA)为保护剂, 通过配体置换法和液相化学还原法制备得到纳米银.考察了双官能团配体对纳米银的制备及热分解的影响.配体置换法制备的纳米银粒径为50 nm左右,化学还原法制备的纳米银粒径为10 nm左右.元素分析结果和X射线光电子能谱表明MPA通过S原子与Ag原子形成共价键,同时通过烷基链之间的氢键作用及范德华力形成多层保护剂保护的纳米银.将纳米银在200 ℃下烧结并对烧结产物进行表征,结果表明加热使得C-S键断裂,Ag/MPA热分解形成硫化银.     

溶胶凝胶法制备Ce_(0.8)Y_(0.15)M_(0.05)O_(2-δ)电解质材料及其性能研究

文章以Ce0.8Y0.15M0.05O2-δ(M=Fe、Co、Mg)为主要研究对象。通过红外、致密度分析、X射线衍射、扫描电镜、交流阻抗、热膨胀等测试方法对试样进行测试和分析,对实验得到的电解质粉及相应的电解质材料的性能进行表征。实验结果表明:溶胶-凝胶法经700℃煅烧成功制备出了单相立方萤石结构的超细粉末,具有良好的烧结活性。1300℃下烧结后相对密度达到97%以上。电导率的测试表明,电解质材料在中温范围有较高的电导率,其中,Ce0.8Y0.15Mg0.05O1.9在800℃时,电导率达到了0.0661 S/cm。     

基于超声喷涂法的柔性印刷电路制备

介绍了一种基于超声喷涂的电路印刷方法,适用于各种柔性材质的基体,可以更高效、更环保地完成柔性印刷电路(FPC)的制造。其主要思想是:纳米银导电油墨通过超声喷头雾化,进而喷涂在覆盖有金属掩膜版的聚酰亚胺(PI)膜基体上,低温烧结(125℃×20 min)之后就得到柔性电路。测试结果表明,图案化的导电线路(宽度为500mm)经过多次弯曲后仍能保持良好的导电性,其表面方阻随喷涂层数的增多而稳定地减小,8层涂覆所得线路的方阻为(21±2)mΩ/sq。扫描电镜观察表明,导电线路平整光滑,毛边误差在50mm以内。     

用银油墨打印及化学镀铜法制备印制电路板电路图形

先在普通打印机上把线路图用纳米银导电油墨打印在聚酰亚胺基板上,再通过化学镀铜制得印制电路板。研究了化学镀铜时间对沉积速率的影响,以及银导电油墨的固化温度对铜镀层耐磨性、附着力、厚度、电阻率等性能的影响。施镀时间为40min时,化学镀铜的沉积速率最大(为13.58μm/h)。银导电油墨的适宜固化温度为300℃,对应的铜镀层电阻率最小(为1.889×107/m),耐磨性和附着力最佳。     

A green method of reducing silver nanoparticles based on bagasse pulp extract for preparing ultraviolet (UV)‐curable conductive ink

The silver nanoparticles are gaining extensive attention due to their tremendous applications in conductive field. In this article, we reported a green method of preparing silver nanoparticles (AgNPs) with bagasse pulp extract acting as reducing agents. In this article, ultrasonic extraction method was adopted. This extraction method has the advantages of simple operation and less impurity content in the extract. Silver nitrate (AgNO₃) solution, bagasse extract, and polyvinyl pyrrolidone (PVP) were used as the silver precursor, reducing agent, and protection agent, respectively. Next, hyperbranched polyurethane acrylate (HPUA) as waterborne resin was mixed with AgNPs to prepare UV‐curable conductive ink. The UV‐curable conductive ink synthesized by the AgNPs showed high conductivity, and the obtained conductive ink had very low resistance (1.06 Ω) and resistivity (2.6 × 10^?5 Ω·m), good electronic stability, showing the great advantage in the field of UV‐curable conductive ink. In addition, we tested the AgNPs conductive ink of tearing resistance, rubbing fastness, and bending strength. The results showed the nanosilver conductive ink had good mechanical properties. J. VINYL ADDIT. TECHNOL., 26:90–96, 2020. © 2019 Society of Plastics Engineers     

羧甲基纤维素钠对纳米银导电墨水性能的影响

通过液相化学还原法,以聚乙烯吡咯烷酮（PVP）为保护剂,甲醛为还原剂制备得到粒径为70 nm左右的纳米银溶胶。离心洗涤得到高纯度和高浓度的纳米银水溶胶,添加羧甲基纤维素钠（CMC）及其它助剂后,在超声处理下获得了水基导电墨水。该墨水的Zeta电位值为(-42.8±0.96) mV,表明其具有较高稳定性。用热泡式按需喷墨打印机,在相纸基材上印制导电图案,并在150 ℃下加热处理30 min后,其方块电阻值由处理前的38.48 kΩ骤降至0.87 Ω。撕拉试验表明,加入CMC后的纳米银导电墨水,在基材上有很好的附着力。     

Use of Nanocellulose to Produce Water-Based Conductive Inks with Ag NPs for Printed Electronics

The need for more sustainable printed electronics has emerged in the past years. Due to this, the use of nanocellulose (NC) extracted from cellulose has recently been demonstrated to provide interesting materials such as functional inks and transparent flexible films due to its properties. Its high specific surface area together with the high content of reactive hydroxyl groups provide a highly tailorable surface chemistry with applications in ink formulations as a stabilizing, capping, binding and templating agent. Moreover, NC mechanical, physical and thermal properties (high strength, low porosity and high thermal stability, respectively) provide an excellent alternative for the currently used plastic films. In this work, we present a process for the production of water-based conductive inks that uses NC both as a template for silver nanoparticles (Ag NPs) formation and as an ink additive for ink formulation. The new inks present an electrical conductivity up to 2 × 10⁶ S/m, which is in the range of current commercially available conductive inks. Finally, the new Ag NP/NC-based conductive inks have been tested to fabricate NFC antennas by screen-printing onto NC-coated paper, demonstrating to be operative.     

紫外光固化导电胶的老化性能研究

以环氧丙烯酸树脂和聚丙烯酸树脂,铜粉和镀银铜粉制备了四种不同品种的紫外光固化导电胶。对导电胶的耐热老化性能和时间老化性能进行了研究,发现镀银铜粉导电胶的老化性能较好,耐热老化温度可以达到200℃,在60d的老化期内导电性仍在10-4Ω．cm数量级,导电胶性质稳定。     

溶胶-凝胶-微波法制备银掺杂TiO_2光催化剂及其光催化性能

用硝酸银和钛酸正丁酯为原料,采用溶胶-凝胶-微波辐射干燥法合成银掺杂TiO_2光催化剂TiO_2-Ag。为了提高催化剂的光催化活性和降解有机污染物的速率,用微波辅助Ti O2-Ag光催化剂降解有机污染物。通过扫描电子显微镜、红外光谱法、紫外可见光谱法和荧光光谱法对TiO_2-Ag催化剂进行测试和表征。以甲基橙为有机污染物,分别在太阳光照射和微波、紫外、紫外-微波条件下降解甲基橙以考察催化剂的光催化活性。结果表明,TiO_2-Ag光催化剂最佳制备条件为:银掺杂量n(Ag+)∶n(Ti~(4+))=0.003,离子液体用量3.0 m L,微波干燥功率210 W,微波干燥时间20 min,焙烧温度650℃,焙烧时间3 h,此条件下制备的TiO_2-Ag光催化剂在太阳光照射4 h下,紫外光照、微波辐射和紫外光照-微波辐射分别辐射55 min后,甲基橙降解率分别为98.70%、98.79%和99.05%。     

On the Use of Silver Plated Nano Aluminum Nitride and Silver Plated Chopped Carbon Fiber to Prepare Electrically Conductive Adhesives with High Thermal Conductivity

To satisfy the high electrical and thermal conductivity required for the development of microelectronic products, silver plated aluminum nitride (Ag/AlN) and silver plated chopped carbon fiber (Ag/CF) were added into an acrylate resin to prepare electrically conductive adhesives (ECAs) with high thermal conductivity. The Ag/AlN was prepared by subjecting AlN to an electroless silver plating using a Pb-free activation method. The Ag/AlN has good electrical and thermal conductivity compared to the AlN without treatment. When the weight fraction of Ag/AlN is 45 ωt%, the electrical conductivity of ECAs based on acrylate resin filled with Ag/AlN is 1.5 S/cm, and the thermal conductivity reaches 2.1 W/(m · K). With the addition of 3 ωt% Ag/CF as supplement filler, the electrical conductivity has a sharp increase to 17.8 S/cm because of the formation of conductive networks in the ECAs. However, the shear strength has an apparent loss, falling from 4.2 to 1.1 MPa.     

Na2HPO4?12H2O相变储能复合材料制备及热物性

十二水磷酸氢二钠的过冷度、相分离以及热导率低等问题影响了其在低温蓄热场合的应用,因此需要对其进行相关的改性研究。本文通过成核剂和增稠剂的筛选实验及添加导热增强剂纳米氧化铁（α-Fe₂O₃）,制备了质量分数为Na₂HPO₄·12H₂O+2% Na₄P₂O₇·10H₂O+1%黄原胶（GX）+0.2%α-Fe₂O₃复合相变储能材料,并对其进行了凝固放热测试、热物性测试及循环稳定性测试。结果表明：2%的Na₄P₂O₇·10H₂O抑制过冷效果最好,成核效果不随循环次数的增加而减小,过冷度维持在2℃左右;GX可以有效抑制Na₂HPO₄·12H₂O的相分离现象,且质量分数为0.75%～1.25%是较合适的剂量;α-Fe₂O₃可以有效地提高Na₂HPO₄·12H₂O的热导率,添加0.2%α-Fe₂O₃使热导率提高了90.8%;循环150次后,复合相变储能材料的相变潜热值为252J/g,相比于循环前衰减了7.4%,相变温度为35.4℃,过冷度为1.3℃,热导率为2.054W/(m·K),相比纯材料提高了100.2%。改性后的复合相变储能材料相变温度适宜,潜热值大,热导率高,热性能稳定,可推广应用到热泵蓄热、温室生产和电子器件散热等领域。     

Spark Plasma Sintered Silicon Nitride Ceramics with High Thermal Conductivity Using MgSiN2 as Additives

Silicon nitride ceramics were prepared by spark plasma sintering (SPS) at temperatures of 1450°–1600°C for 3–12 min, using α-Si₃N₄ powders as raw materials and MgSiN₂ as sintering additives. Almost full density of the sample was achieved after sintering at 1450°C for 6 min, while there was about 80 wt%α-Si₃N₄ phase left in the sintered material. α-Si₃N₄ was completely transformed to β-Si₃N₄ after sintering at 1500°C for 12 min. The thermal conductivity of sintered materials increased with increasing sintering temperature or holding time. Thermal conductivity of 100 W·(m·K)⁻¹ was achieved after sintering at 1600°C for 12 min. The results imply that SPS is an effective and fast method to fabricate β-Si₃N₄ ceramics with high thermal conductivity when appropriate additives are used.     

Preparation of vapreotide-templated silver nanocages and their photothermal therapy efficacy

Vapreotide acetate(Vap) was used as a biotemplate to synthesize silver nanocages through direct co-incubation of a AgNO_3 solution, following by reduction using fresh NaBH_4. The characterized vapreotide-templated silver nanocages(Vap-Ag ) presented a wide and red shifted absorption band with a maximum between 480 nm and 800 nm and possessed a uniform structure with a face-centered cubic crystal structure. The biocompatibility of Vap-AgN Cs was assessed using the MTT method, indicating Vap-AgN Cs had better biocompatibility when its concentration was lower than 2.5 × 10~(-4) mmol·L~(-1). The photothermal characteristics of Vap-Ag NCs were analyzed with laser irradiation(808 nm, 1.5 W·cm~(-2)) and the results showed that the temperature of the VapAg NCs solution reached 45 °C starting from 25 °C within 5 min. Additionally, Vap-Ag NCs with a laser led to HeL a cell death. Therefore, the prepared Vap-AgN Cs is expected to be an effective photothermal therapy agent.     

聚氨酯/镀银纳米石墨导电胶的制备与性能研究

以聚氨酯(PU)预聚体为基体,以镀银纳米石墨为导电填料,采用共混法制备PU/镀银纳米石墨导电胶,并与PU/纳米石墨导电胶进行电学性能、力学性能和热稳定性能对比。结果表明:PU/镀银纳米石墨导电胶和PU/纳米石墨导电胶的导电渗流阈值分别为3%和9%,此时对应的电导率分别为0.044 S/cm和0.012 S/cm;前者的力学性能(最大剪切强度为5.76 MPa)高于后者(最大剪切强度为3.65 MPa),并且前者的起始分解温度比后者提高了近10℃,说明前者的应用前景比后者更广阔。