Highly concentrated graphene oxide ink for facile 3D printing of supercapacitors

3D printing of functional energy storage devices is receiving escalating attention over the years due to the customizable manufacturing flexibility and imparted high areal and gravimetric energy density of three-dimensional structured devices, which contribute to the creation of numerous new opportunities for futuristic electronics. Graphene-based inks are ideal elements for the realization of 3D printed energy storage devices if the attractive intrinsic physiochemical properties of graphene could be preserved. However, it is still a great challenge to prepare uniformly dispersed graphene-based materials with desired rheological properties for 3D printing. Here we report a facile strategy for 3D printing of supercapacitors from a highly concentrated graphene oxide (GO) ink. The GO is properly dispersed and the ink fulfills the stringent rheological specifications for 3D printing. The printed GO electrode is functionalized with enhanced structural stability for proper reduction to graphene. The printed supercapacitors deliver the potential to linearly scale up in areal capacitance without jeopardizing the gravimetric capacitance when increasing printed layers. The results hold great promise for the construction of 3D structured energy storage devices that cater to the challenges from next-generation electronics.

Preparation of PDOT:PSS Transparent Conductive Film Using Ink-Jet Printing

Flexible devices produced using organic materials have attracted the attention of many researchers. Important components of these flexible devices include transparent electrodes, which transmit visible light and possess conductivity. The present study improved the characteristics of a transparent conductive film that was made of poly(3, 4 ethylenedioxythiophene):poly(styrenesul-fonate) (PEDOT:PSS), an organic conductive material, and that had been prepared using ink-jet printing. To improve the resistance value and visible light transmittance of the film, the film substrate was first cleaned with ultraviolet/ozone treatment, and then the film was annealed after it was deposited on the substrate and dipped into a polar solvent. Consequently, the resistance value of the thin film decreased. However, the surface state of the film changed according to the treatment method and affected its visible light transmittance. Thus, the surface state of the film substrate, the annealing temperature after film deposition, and the dipping treatment with a polar solvent influenced the characteristics of a thin film.

Characteristics Improvement of PEDOT:PSS Transparent Conductive Film Prepared by Ink-Jet Printing

Recently, a high-performance and low-priced transparent conductive film has been expected to be developed because flexible devices produced using organic materials have been actively studied. An indium tin oxide (ITO) thin film, which has been generally used as a material for a transparent conductive film, has problems, such as fragility to bending stress and depletion of the resource. The present study used poly(3, 4-ethylenedioxythiophene)/poly(styrenesulfonate) (PEDOT:PSS), an organic electroconductive material, and examined the improvement in the resistance value and visible light transmittance of a transparent conductive film produced using the ink-jet method. In previous studies, we reported that, to improve the resistance value and visible light transmittance of a thin film, it was effective to clean the film substrate with ultraviolet/ozone (UV/O3) treatment, anneal the film after it was deposited on the substance, and dip the annealed film into a polar solvent. Focusing on the thin film processing between printing operations, the present study improved resistance value and visible light transmittance by examining both the application methods of a polar solvent and the annealing time between printing operations. As a result, the resistance value and visible light transmittance of a PEDOT:PSS thin film were 390.4 Ω and 86.6%, respectively. This film was obtained by applying a polar solvent and performing annealing for 30 min between printing operations. The printing was performed three times.

The Effect of Silica Particle Size on the Performance of Color Ink-jet Printing Paper

In this paper,the effects of four sorts of silica with the particle size range of 4～10μm on coated paper properties and printing performance were studied.The results showed that the smaller particle size silica can provide the coated paper with higher density and contrast, better definition and good printing performance.

Application of nonlinear color matching model to four-color ink-jet printing

Through discussing the color matching technology and its application in printing industry the conventional approaches commonly used in color matching, and the difficulties in color matching, a nonlinear color matching model based on two step learning is established by finding a linear model by learning pure color data first and then a nonlinear modification model by learning mixed color data. Nonlinear multiple regression is used to fit the parameters of the modification model. Nonlinear modification function is discovered by BACON system by learning mixture data. Experiment results indicate that nonlinear color conversion by two step learning can further improve the accuracy when it is used for straightforward conversion from RGB to CMYK. An improved separation model based on GCR concept is proposed to solve the problem of gray balance and it can be used for three to four color conversion as well. The method proposed has better learning ability and faster printing speed than other historical approaches when it is applied to four color ink jet printing.

Fuzhou Printing Ink Factory

Found in 1958, Fuzhou Printing inkhas a long history of more than 40 years.It mainly produces various printing ink,interrelated synthetized resin, vehicleand inside coatings and outside coatingsfor three-piece metallic containersincluding food tin cans of the

Investigation of Electrical Stability of Nonwovens with Conductive Circuits Using Printed Conductive Inks

In this work, we study the stability of a class of materials obtained by printing a textile with conductive inks using a method called screen printing. Under the action of a certain external factors, the printed circuit suffers deterioration and the conductivity decreases considerably. In this work, we propose to model the overall damage of the textile sheet in terms of the partial damages of the conductive lines. We also apply this approach to evaluate the damage of a system being made of transmission lines printed into nonwoven substrates using different conductive inks.

Research on HCI Prototype Design of Ink Automatic Control System for Offset Printer

In order to solve the low efficiency and poor precision problems of traditional ink control methods on domestic offset printers,developing modern ink automatic control system has become more and more urgent.As an important subsystem,the hu- man computer interface (HCI) is a key function for the wholly automatic control.Once this goal is obtained,all the printing pro- cedures especially the automatic control of ink volume should be finished with human computer interface in different areas.consid- ering the HCI design theory and structure characteristics of domestic printers comprehensively,the HCI prototype for automatic ink control system has been developed based on Visual Basic platform.As the individual ink key is instead of the integrated key,the di- vision result of ink fountain can be displayed on the interface.Through the interface,the dynamic adjusting functions such as mod- ifying ink volume,locking or unlocking each ink key and real-time displaying the adjusting results etc.can be completed.The sim- ulation test has shown that the opening and practical feature of the prototype is satisfactory.

Carbon-Based Flexible and All-Solid-State Micro-supercapacitors Fabricated by Inkjet Printing with Enhanced Performance

By means of inkjet printing technique, flexible and all-solid-state micro-supercapacitors(MSCs) were fabricated with carbon-based hybrid ink composed of graphene oxide(GO,98.0vol.%) ink and commercial pen ink(2.0vol.%). A small amount of commercial pen ink was added to effectively reduce the agglomeration of theGO sheets during solvent evaporation and the following reduction processes in which the presence of graphite carbon nanoparticles served as nano-spacer to separate GO sheets. The printed device fabricated using the hybrid ink,combined with the binder-free microelectrodes and interdigital microelectrode configuration, exhibits nearly 780%enhancement in areal capacitance compared with that of pure GO ink. It also shows excellent flexibility and cycling stability with nearly 100% retention of the areal capacitance after 10,000 cycles. The all-solid-state device can be optionally connected in series or in parallel to meet the voltage and capacity requirements for a given application.This work demonstrates a promising future of the carbonbased hybrid ink for directly large-scale inkjet printing MSCs for disposable energy storage devices.

Forming mechanism of ink layer on the printing plate in inking process and influencing factors of its thickness

Ink layer thickness on the printing plate greatly influences uniformity of ink transferred to the substrates,which is an important indicator of printing quality,so the study of ink layer and its thickness is important for improving the quality of printing products. Ansys CFX is used here to build a model of ink fluid adhering to lower vibrator roller,form inking roller,and printing plate for analyzing ink transferring in inking process. Ink layer thickness on each position of the model is acquired to analyze the forming mechanism of ink layer on printing plate,as well as the influence of oscillation speed of lower vibrator roller and dot area percentage of plate on ink layer thickness of printing plate. It can be concluded that,in the case of fixed ink supplying amount,ink layer thickness increases along with the increasing of oscillation speed,and decreases when the dot area percentage is getting larger and the minimum is got when the dot area percentage is 100%. At last,experiment of plate inking on print ability tester verifies the correctness of the simulation analysis.

An Example of Machine Vision Applied in Printing Quality Checking——Research on the Checking of Printing Quality by Image Processing

The traditional printing checking method always uses printing control strips,but the results are not very well in repeatability and stability. In this paper,the checking methods for printing quality basing on image are taken as research objects. On the base of the traditional checking methods of printing quality,combining the method and theory of digital image processing with printing theory in the new domain of image quality checking,it constitute the checking system of printing quality by image processing,and expound the theory design and the model of this system. This is an application of machine vision. It uses the high resolution industrial CCD(Charge Coupled Device) colorful camera. It can display the real-time photographs on the monitor,and input the video signal to the image gathering card,and then the image data transmits through the computer PCI bus to the memory. At the same time,the system carries on processing and data analysis. This method is proved by experiments. The experiments are mainly about the data conversion of image and ink limit show of printing.

3D打印生物墨水在组织修复与再生医学中的应用

背景:通过选用合适的生物墨水,3D打印技术可用以制造人体组织和器官的代替物,并在人体内发挥作用。近些年来3D打印技术发展迅速,在再生医学中有着巨大的应用潜力。目的:介绍3D打印用生物墨水的类型,并综述生物墨水的分类、应用、优缺点及未来愿景。方法:以“3D printing,Biological ink,Tissue engineering,hydrogel,Synthetic material,Cytoactive factor,3D打印、生物墨水、组织工程”为检索词,运用计算机检索2000-2022年以来发表在PubMed、CNKI数据库中的相关文献,最终纳入83篇进行综述。结果与结论:在过去的几十年里,生物3D打印技术发展迅速,在组织工程和生物医学等各个领域都受到了极大的关注。相对于传统生物支架制造方法在功能性及结构方面受到的限制,3D打印可以更好地模拟生物组织复杂的结构,并且具有合适的力学、流变学和生物学特性。生物墨水是3D打印中必不可少的一部分,通过生物材料制备的生物墨水,经打印后产生的生物支架在组织修复和再生医学等方面有着巨大的科研潜力及临床意义,其材料的研究本身也越来越受到专家们的重视。3D打印生物墨水的材料各种各样,有天然材料也有合成材料,还有一些不需要任何额外生物材料的细胞聚集体,并且各种材料在实际运用中的功效各不相同。未来会有越来越多的生物墨水被研制用于组织工程,需要通过充足的实验模拟及设备测试来对生物墨水的可打印性进行分析,从而满足实际的医用需求。

STUDY ON FACTORS INFLUENCING INK ABSORPTION OF COATED PAPER

Ink absorption is one of the most important factors which influence printing properties. This article had discussed the influence of coating properties, technologies of heating and pressure etc. on ink absorption and showed that ink absorption can be adjusted and coating surface structure can be improved when technologies of heating and pressure change, pigment and adhesive altered.

Preparation of Cu@Ag Nanoparticles for Conductive Ink

In order to overcome the shortcomings of low-cost anti-oxidation conductive ink and its preparation method in the field of printing electronics, core-shell coated Cu@Ag nanoparticles were used to prepare conductive ink, and a printed circuit was obtained by inkjet printing. Copper nanoparticles were prepared by a chemical reduction method and then coated with Cu@Ag particles by a copper-based self-catalytic reaction. Conductive ink was prepared by ball milling and dispersion and printed on PI film to form a conductive coating. After characterization and analysis, the particle size and dispersion of the obtained Cu@Ag meet the requirements and can be stored stably under normal atmospheric conditions. The resistivity of the conductive film sintered at 300˚C is only 10.6 μΩ∙cm.

Formation of Copper Nickel Bimetallic Nanoalloy Film Using Precursor Inks

Precursor (Metal-organic decomposition (MOD)) inks are used to fabricate 2D and 3D printed conductive structures directly onto a substrate. By formulating a nanoalloy structure containing multiple metals, the opportunity to modify chemical and physical properties exists. In this paper, a copper-nickel bimetallic nanoalloy film was fabricated by mixing copper and nickel precursor inks and sintering them in vacuum. The individual elemental inks were formulated and characterized using SEM, EDS, and XRD. During thermal processing, elemental copper forms first and is followed by the formation of bimetallic copper-nickel alloy. The encapsulation of the underlying copper by the nickel-rich alloy provides excellent oxidation resistance. No change in film resistance was observed after the film was exposed to an oxygen plasma. Nanoalloy films printed using reactive metallic inks have a variety of important applications involving local control of alloy composition. Examples include facile formation of layered nanostructures, and electrical conductivity with oxidative stability.

温度对植物蛋白基油墨3D打印性能的影响

为了开发新型食品类3D打印材料,本文以大豆分离蛋白-谷朊粉-大米蛋白(SPI-WG-RP)复合糊状物为对象,探究不同打印温度(25、30、35、40℃)对复合植物蛋白基油墨的流变性能、3D打印性能和结构特性的影响。结果表明,所有温度下SPI-WG-RP油墨均表现出剪切稀化行为(R^(2)≥0.98),具有3D打印可行性。打印温度的升高降低了SPI-WG-RP油墨的屈服应力和黏度。当温度达到40℃时,蛋白基油墨材料的挤出恢复最好(>62.79%),SPI-WG-RP油墨具有出色的自支撑行为。此外,打印温度的升高促进了三种蛋白之间的紧密连接,40℃时样品微观结构更加致密均匀,在一定程度上提升了3D打印性能。本研究为制备具有打印性能良好的植物蛋白基油墨提供了理论依据,这有利于拓展3D打印技术在植物蛋白领域的应用。

用于智能包装及物流监控的PVDF压电薄膜传感器研究

在物联网+时代,物流运输监管需要包装智能化。智能包装能够记录运输过程中的物流信息,并提供给用户及监管部门。结合现有包装生产技术,研制一种低成本、一次性使用、可量产的柔性压电传感器十分必要。用PVDF压电墨水,通过涂布的方法在柔性基底上制备了高性能压电薄膜。实验证明,不同溶剂对PVDF薄膜的结晶度及晶相形成有较大影响。晶相优化后的压电薄膜经过进一步电晕极化,其压电性能提高了一倍。用极化后的压电薄膜制备的压电传感器具有良好的柔性/共型性、优异的耐弯曲性和鲁棒性。其循环冲击测试结果证明压电传感器具有可重复和持久使用性。这一PVDF柔性压电薄膜传感器可直接印刷在包装箱体或包装膜上,用于智能物流监测。

基于压电喷墨技术3D打印纳米银墨水的固化工艺研究

为了改善喷墨3D打印纳米银墨水的导电性,研究热台固化、近红外固化和光热耦合固化对纳米银墨水固化后微观形貌和电导率的影响。通过压电喷墨打印纳米银墨水,并用热台和近红外灯对纳米银薄膜进行固化。结果表明:热台固化时,纳米银薄膜的电阻率随固化时间和固化温度的升高而降低,在固化时间25 min,固化温度140℃时下降至99μΩ·cm;近红外固化时,固化功率1000 W,固化时间4 min的条件下,电阻率为33.2μΩ·cm;光热耦合固化时,纳米银薄膜的电阻率随扫描功率和固化时间的增加而降低,基板加热温度160℃、扫描功率为1000 W、固化时间60 s的条件下,电阻率为3.75μΩ·cm。光热耦合固化烧结颈的生长速度明显优于热固化及光固化。