Application Of Ink Research Articles

Monoazo (Monohydrazone) pigments based on 2-naphthol and derivatives

Abstract This chapter describes the range of industrial monoazo pigments based on the 2-naphthol (β-naphthol) ring system. This group includes some of the earliest organic pigments introduced commercially and is also numerically the largest group of products currently described in the Colour Index. Most of the pigments within this group are red (with a few oranges), thus complementing the azoacetoacetanilides, which are mostly yellows. Three groups of monoazonaphthol-based pigments may be identified categorized according to the chemical structure of the coupling components used in their synthesis. The first group contains products based on 2-naphthol itself, a second is based on amide derivatives of 3-hydroxy-2-naphthoic acid (naphtharylamides), and the third is a series of metal salt azo pigments. The historical development of these pigments, outlined in an early section of this chapter, originated in the late 19th century with pigments described as ‘lakes’, derived from water-soluble anionic dyes absorbed on to inert colorless substrates, which were the forerunners of products now referred to as metal salt pigments. The non-ionic 2-naphthol-based pigments were introduced soon after. In the early to mid-20th century, a series of monoazonaphtharylamide (Naphthol AS) pigments were developed and introduced commercially. The pigments of this type that are currently manufactured can be sub-divided into products containing a single amide group (group 1) and higher performance products containing more than one amide or sulfonamide groups. Several group 1 pigments have diminished in importance over the years, while some higher performing group 2 pigments have grown in importance. The molecular and crystal structures of the range of pigments are presented and discussed in relation to their performance characteristics. The manufacture of the pigments involves the reaction of a diazotized aromatic amine with the appropriate 2-naphthol-based coupling component, using synthesis conditions typical of phenolic coupling components, followed by conditioning aftertreatments that are typical for azo pigments in general. Finally, there is an extensive discussion of the wide-ranging applications in which the individual pigments are used. While the pigments are especially well-suited to printing ink applications, many products also find use in paints and a few in plastics.

Approaching Classical Japanese Haiku Poetry through the Perspective of Ink Painting Art and Application to Teaching Foreign Literature for Literature Pedagogy Students at Dong Thap University

Exploring the culture and literature of countries around the world is increasingly important in the current trend of international exchange and integration. Therefore, foreign literature disciplines, including Japanese literature, occupies an increasingly essential position in the curriculum of Dong Thap University. However, the perception and teaching of Japanese Haiku poems have long been challenged due to language barriers as well as cultural differences. In order for enhancing the quality of teaching Haiku poetry to Literature Pedagogy majors at Dong Thap University, the article presents a new approach towards classical Haiku poetry through the perspective of ink painting art (aka painting art). With the aim of observing the beauty of Japanese literature and culture, the study analyzes the causes and some specific manifestations of the similarities between Japanese ink painting art and classical Haiku poetry in terms of artistic methods. The root cause lies in the influence of Zen, as a cultural characteristic of the Japanese spirit, and the specific manifestations include the technique of empty spaces in ink painting art, and the empty poetic strategy in classical Haiku poetry, the features of the conception scenery and the moment characteristic in both Oriental art genres.

Cationic (Basic) dye complex pigments

Abstract Cationic (or basic) dye complex pigments are classical organic pigments obtained from water-soluble cationic dyes for textiles, mainly of triarylmethine (arylcarbonium ion) types, which are precipitated using large inorganic counterions, especially those derived from heteropolyacids such as phosphotungstomolybdic acid or, to a certain extent, using the counteranion derived from copper ferrocyanide. This range of pigments includes red, violet, blue and green products, offering brilliant shades, high color strength and good transparency. They are well suited to printing ink applications, although they provide only moderate levels of fastness properties. The pigments are synthesized by treating aqueous solutions of the dyes under highly controlled conditions with solutions of the heteropolyacids, prepared in situ. The copper ferrocyanide salts are obtained by treatment of potassium ferrocyanide with sodium sulfite in water, and subsequently with solutions of the cationic dye and copper (II) sulfate. The pigments are primarily used in inks for packaging and advertising materials. However, they have little use outside printing inks. Reflex or alkali blue pigments are structurally related cationic dye derivatives which are inner salts of the dye structures and are also used in printing inks.

Development and scale‐up of thermoplastic poly(ether‐ester) glycol polyurethanes for flexography

AbstractThis study presents an experimental essay on the production of thermoplastic polyurethanes for flexographic printing ink applications. Four formulations were obtained by step‐growth polymerization reactions having the pre‐polymer 4,4′‐diphenylmethylene diisocyanate and Voranol 2120 L® catalyzed by dibutyltin dilaurate as common ground. In the chain extension step, ethanol or ethyl acetate was used as solvent, and the use or not of castor oil as a chain extender in addition to hexanedioic acid and 2,2′‐oxydi(ethan‐1‐ol) was evaluated. The chemical structures of the synthesized thermoplastic polyurethanes (TPUs) were evaluated by Fourier transform infrared spectroscopy, 1H NMR, gel permeation chromatography, differential scanning calorimetry, and rheological features were assessed by density and viscosity analysis. The TPU resins were used to produce flexographic printing inks and further tested by friction, adhesion, gloss, and Gardner viscosity essays. It was found that the castor oil presence enhanced ink viscosity in 66% (from 26,790 to 44,440 Pa s) as well as improved strength. Formulations using ethanol as solvent showed the best results. The experiments were carried in a 250 ml reactor and then, scaled up to 2000 ml, keeping the power transfer per unit of volume constant at around 0.8 W/L. The analytical results from the larger scale were as good as the obtained in scale one, showing promising application.

Approaching classical Japanese Haiku poetry through the perspective of ink painting art and application to teaching foreign literature for Literature Pedagogy students at Dong Thap University

Exploring the culture and literature of countries around the world is increasingly important in the current trend of international exchange and integration. Therefore, foreign literature disciplines, including Japanese literature, occupies an increasingly essential position in the curriculum of Dong Thap University. However, the perception and teaching of Japanese Haiku poems have long been challenged due to language barriers as well as cultural differences. In order for enhancing the quality of teaching Haiku poetry to Literature Pedagogy majors at Dong Thap University, the article presents a new approach towards classical Haiku poetry through the perspective of ink painting art (aka painting art). With the aim of observing the beauty of Japanese literature and culture, the study analyzes the causes and some specific manifestations of the similarities between Japanese ink painting art and classical Haiku poetry in terms of artistic methods. The root cause lies in the influence of Zen, as a cultural characteristic of the Japanese spirit, and the specific manifestations include the technique of empty spaces in ink painting art, and the empty poetic strategy in classical Haiku poetry, the features of the conception scenery and the moment characteristic in both Oriental art genres.

Multifunctional N-Doped Carbon Dots for Bimodal Detection of Bilirubin and Vitamin B12, Living Cell Imaging, and Fluorescent Ink.

A N-doped carbon dot (NCD) has been synthesized via a simplistic one-step hydrothermal technique using l-aspartic acid and 3,6-diaminoacridine hydrochloride. The NCDs exhibit a high quantum yield (22.7%) and excellent optical stability in aqueous media. Additionally, NCDs display good solid-state yellowish-green emission and are suitable for security ink applications. The remarkable fluorescence (FL) properties of NCDs are further applied to develop a multifunctional sensor for bilirubin (BR) and vitamin B12 (VB12) via fluorescence quenching. We have systematically studied the FL quenching mechanisms of the two analytes. The primary quenching mechanism of BR is via the Förster resonant energy transfer (FRET) pathway facilitated by the H-bonding network between the hydrophilic moieties existing at the surface of BR and NCDs. In contrast, the inner filter effect (IFE) is mainly responsible for the recognition of VB12. The practicability of the nanoprobe NCDs is further tested in real-sample analysis for BR (human serum and urine samples) and VB12 (VB12 tablets, human serum, and energy drink) with a satisfactory outcome. The in vitro competency is also verified in the human cervical cancer cell line (HeLa cell) with negligible cytotoxicity and significant biocompatibility. This result facilitates the application of NCDs for bioimaging and recognition of VB12 in a living organism.

A study of carbon nanodots (carbon quantum dots) synthesized from tangerine juice using one-step hydrothermal method

Carbon nanodots are one of the latest intriguing members of the nanocarbon family due to their improved aqueous solubility, low-cost production, good conductivity, nontoxic behavior, high biocompatibility, and eco-friendly nature in contrast to chemically derived carbon nanomaterials. In the present study, the water-soluble carbon nanodots were synthesized by using the one-step hydrothermal method. Tangerine juice was used as a carbon source. The synthesized carbon dots were characterized by X-ray diffraction, high-resolution transmission electron microscopy, UV-Vis spectrum and fluorescence spectra. DFT-based ab initio material modeling technique including the Van der Waals interactions was applied. The electronic properties were examined by DOS analysis. Although the geometrical shapes of carbon nanodots are known as quasi-spherical, according to the HR-TEM results, carbon nanodot particles that consist of cuboidal geometric shapes were found for the first time in this study. Moreover, the usability of the synthesized carbon nanodots in security ink applications has been investigated.

Synthesis of polyacrylate dispersant by DPE method and its application in inkjet ink of titanium dioxide

In this article, we synthesized a series of poly butyl acrylate-co-methacrylic acid-2-acrylamido-2-methyl propanesulfonic acid (PBAS) with different molecular weight and monomer molar ratios by 1,1-diphenylethene (DPE) method on industrial scale. The PBAS was applied as a dispersant for waterborne TiO2 paste to prepare waterborne inkjet ink. The successful synthesis of PBAS was confirmed by FTIR and 1H-NMR. To evaluate the printability and storage properties of pastes and inks, we characterized the particles, particle distribution, the storage modulus, viscosity, precipitation coefficient, and delamination height. The method creatively used in our study to characterize the printing smoothness of the ink in the industrial practical application was the filter rate of ink. We also proposed a method of using soft and hard precipitation to characterize the precipitation situation. The results of the experiment indicated that compared with commercial dispersants, PBAS5/6 had excellent performance in printing flow and anti-settling performance. This paper demonstrates the optimum dispersibility of PBAS was obtained when the molecular weight was 8500, the acid value was 100 mg KOH/g, and the 2-acrylamido-2-methylpropanesulfonic acid (AMPS) content was 20%. This fruitful work pointed out the great prospects of industrial synthetic water-based dispersants.

Particle-free compositions for printing dense 3D ceramic structures by digital light processing

ABSTRACT UV-curable particle-free ceramic compositions for stereolithography-based 3D printing technologies present a promising alternative to the commonly used particle-based compositions. So far, such compositions were mainly based on solutions of pre-ceramic polymers which limit their applications to silicon-containing materials. However, the application of particle-free inks for the fabrication of other ceramic materials, in particular dense polycrystalline ones, is very little explored. We present a new and general fabrication approach based on all-solution compositions, by combining sol–gel chemistry and photopolymerization, for obtaining dense 3D ceramic structures by DLP printing. The process is demonstrated here for the fabrication of barium titanate (BaTiO3). By using chelating solvent and monomer, a stable UV-curable solution is obtained. An aging period of 8–14 days was crucial for obtaining dense ceramic objects without any secondary phases. The heat treatment was found to affect the microstructure, density and hardness of the resulting ceramics. The presented process enables obtaining objects free of carbon materials, having a density as high as 98% of the theoretical value, and a hardness of 4.3 GPa.

Excitation-dependent multiple luminescence emission of nitrogen and sulfur co-doped carbon dots for cysteine sensing, bioimaging, and photoluminescent ink applications

The concentration of L-cysteine (Cys), a sulfur-containing amino acid, acts as an indicator and biomarker for various diseases in humans. Therefore, the identification and detection of abnormal concentrations of Cys are critically important for determining human health. In this study, excitation-dependent multiple emission nitrogen and sulfur co-doped carbon dots (NS-CDs) are synthesized using a one-pot hydrothermal method. The prepared NS-CDs exhibit a small particle size, good optical properties with high quantum yield, excellent stability, and excitation-dependent photoluminescence (PL) property. The synthesized NS-CDs display a narrow diameter ranging from 3 to 7 nm with a relatively higher quantum yield (QY) up to 11.4%. Under optimal conditions, these NS-CDs show good selectivity for Cys over other biologically relevant species and even other similar (di)thiols (GSH/DTT). The synthesized NS-CDs show excellent selectivity and sensitivity to Cys, with a low detection limit of 23 nM and a linear detection range from 0 to 10 μM. The NS-CDs and NS-CDs/Cys are used for cell imaging, showing low toxicity to HCT116 cells and exhibits green fluorescence when observed by confocal microscopy. Furthermore, the controllable and strong photoluminescent emission properties of the NS-CDs and NS-CDs/Cys are visualized as green photoluminescent ink under UV light illumination. The present study is an attractive and innovative perception into the biomedical applications of NS-CDs with controllable photoluminescence.

Improvement of the mechanical and aesthetic properties of a coating by inkjet technology

AbstractDifferent amounts of ink, made up almost entirely of a frit that devitrified abundant small crystals of anorthoclase, were applied by inkjet printing onto a traditional unfired glaze substrate. The rheological properties of the ink and porous texture of the unfired glaze substrate were characterized. The fired coatings were analyzed by SEM–EDX to determine the elemental composition at different surface depths, and their microstructure was observed. The results confirmed the validity of the ink penetration model, developed in a previous study, for describing the composition profile in inkjet coatings as a function of the applied amount of ink and pore size and volume in the unfired glaze substrate relative to average ink particle size. Microhardness and indentation modulus of the fired glaze substrate without an ink application and of the fired ink‐containing coatings were determined. The values of these properties were verified to fit a Weibull distribution function. The coatings containing an ink application at 400 and 600 dots per inch (dpi), respectively, displayed the best mechanical behavior. The study confirmed that inkjet printing a suspension with appropriate physico‐chemical characteristics onto an unfired glaze substrate substantially improved the aesthetic characteristics and mechanical properties of the resulting fired coating.

Green Synthesis of Self-Passivated Fluorescent Carbon Dots Derived from Rice Bran for Degradation of Methylene Blue and Fluorescent Ink Applications

Recently, natural products are the powerful carbon source to synthesize carbon dots (CDs) with interesting physical and chemical properties. In this present work, we report a facile hydrothermal synthesis method for preparing fluorescent carbon dots using a biogenic precursor of rice bran without any surface passivation agent. The synthetic methodology was easy, simple, environmental friendly and convenient. Structural and optical properties of the RB-CDs have been studied by UV-visible, Fourier transform infrared spectroscopy (FTIR), Field emission scanning electron microscopy (FESEM), Fluorescence spectra and X-ray photoelectron spectroscopy (XPS) techniques. The prepared RB-CDs exhibited green emission upon irradiation with UV light and the calculated fluorescence quantum yield (QY) was found to be 7.4%. The morphological features of the synthesized RB-CDs were characterized by High-Resolution Transmission Electron Microscopy (HR-TEM), the average size of the RB-CDs was found to be 2.96nm. The synthesized RB-CDs were beneficially applied as a catalyst for the catalytic degradation of methylene blue (MB) dye using NaBH4 as the reducing agent in the ambient conditions. The degradation of MB dye under light illumination was 89.20% in 30min. Further, the obtained highly fluorescent RB-CDs were efficiently utilized as a fluorescent ink for luminescent pattern printing (patterning agent) in the anti-counterfeiting applications.

Cyan color-emitting nitrogen-functionalized carbon nanodots (NFCNDs) from Indigofera tinctoria and their catalytic reduction of organic dyes and fluorescent ink applications.

The present study reports the synthesis of nitrogen-functionalized carbon nanodots (NFCNDs) by a low-cost hydrothermal method using the leaf extract of Indigofera tinctoria as a novel carbon precursor. The synthesized NFCNDs were characterized by diverse spectroscopic techniques. The optical properties of N-CNDs were analyzed by UV-visible and fluorescence spectroscopic studies. The quantum yield (QY) for the prepared NFCNDs was found to be 12.6%. The surface morphology, functional groups, and crystallinity of NFCNDs were evaluated by HR-TEM, FT-IR, XRD and Raman spectroscopic methods, respectively. The Raman results revealed the moderate graphite structure of NFCNDs, and the calculated ID/IG value was 0.49. The spherical appearance of the synthesized NFCNDs was confirmed by HR-TEM, and the calculated size of the NFCNDs was 4 nm. The XRD and SAED pattern results gives an evidence for the amorphous nature of the prepared NFCNDs. The thermal stability of NFCNDs was studied by TGA analysis. The resulting NFCNDs acted as a green nanocatalyst and thus efficiently improved the reducing capability of sodium borohydride (NaBH4) in the catalytic reduction of methylene blue (MB) and methyl orange (MO) dyes. Furthermore, the bright cyan emission characteristics of synthesized NFCNDs were utilized as a labeling agent in anti-counterfeiting applications.

Simple Vanilla Derivatives for Long-Lived Room-Temperature Polymer Phosphorescence as Invisible Security Inks.

Developing novel long-lived room-temperature polymer phosphorescence (RTPP) materials could significantly expand their application scope. Herein, a series of RTPP materials based on eight simple vanilla derivatives for security ink application are reported. Attributed to strong mutual hydrogen bonding with polyvinyl alcohol (PVA) matrix, vanilla-doped PVA films exhibit ultralong phosphorescence emission under ambient conditions observed by naked eyes, where methyl vanillate shows the longest emission time up to 7 s. Impressively, when vanilla-doped PVA materials are utilized as invisible security inks, and the inks not only present excellent luminescent emission stability under ambient conditions but also maintain perfect reversibility between room temperature and 65°C for multiple cycles. Owing to the unique RTPP performance, an advanced anticounterfeiting data encoding/reading strategy based on handwriting technology and complex pattern steganography is developed.

Synthesis of high quality 2D carbide MXene flakes using a highly purified MAX precursor for ink applications.

The practical application of 2D MXenes in electronic and energy fields has been hindered by the severe variation in the quality of MXene products depending on the parent MAX phases, manufacturing techniques, and preparation parameters. In particular, their synthesis has been impeded by the lack of studies reporting the synthesis of high-quality parent MAX phases. In addition, controllable and uniform deposition of 2D MXenes on various large-scale substrates is urgently required to use them practically. Herein, a method of pelletizing raw materials could synthesize a stoichiometric Ti3AlC2 MAX phase with high yield and processability, and fewer impurities. The Ti3AlC2 could be exfoliated into 1–2-atom-thick 2D Ti3C2Tx flakes, and their applicability was confirmed by the deposition and additional alignment of the 2D flakes with tunable thickness and electrical properties. Moreover, a practical MXene ink was fabricated with rheological characterization. MXene ink exhibited much better thickness uniformity while retaining excellent electrical performances (e.g., sheet resistance, electromagnetic interference shielding ability) as those of a film produced by vacuum filtration. The direct functional integration of MXenes on various substrates is expected to initiate new and unexpected MXene-based applications.

Nanostructures derived from expired drugs and their applications toward sensing, security ink, and bactericidal material

In this research, a facile and economical route is introduced for the transformation of pharmaceutical waste (i.e., expired medicines) into value-added fluorescent carbon quantum dots (pharmaceutically derived CQDs abbreviated as ‘P-CQDs’). The synthesized P-CQDs were identified to have surface functionalities of –OH, C=O, and C=C with an average size of ~2–3 nm and a high quantum yield of 35.3%. The photoluminescence of P-CQDs recorded a maximum optical emission intensity at 2.8 eV (425 nm). The binding of Cu (II) ions by -COOH functionalities on the surface of P-CQDs led to its fluorescence quenching (turn-off) over a wide Cu (II) concentration range of 0.25–50 ppm. The P-CQDs exhibited the detection limit of 0.66 ppm (well below the WHO permissible limit of 2 ppm). The fluorescence intensity of the P-CQDs-Cu (II) complex was recovered from NaHCO3.Hence, their “off-on” behavior was also explored for security ink applications for information encryption and decryption. Moreover, the rich oxygenated groups on the surface of the P-CQDs were utilized for green synthesis of plasmonic Ag@P-CQDs nanostructures, which were also demonstrated to have enhanced potential as bactericidal materials (e.g., against both E. coli and S. aureus). The overall results of this study are demonstrated to help create new and diverse routes for converting expired drugs into value-added nanostructures.

Circularly polarized lanthanide luminescence for advanced security inks.

Authenticating products and documents with security inks is vital to global commerce, security and health. Lanthanide complexes are widely used in luminescent security inks owing to their unique and robust photophysical properties. Lanthanide complexes can also be engineered to undergo circularly polarized luminescence (CPL), which encodes chiral molecular fingerprints in luminescence spectra that cannot be decoded by conventional optical measurements. However, chiral CPL signals have not yet been exploited as an extra security layer in advanced security inks. This Review introduces CPL and related concepts that are necessary to appreciate the challenges and potential of lanthanide-based, CPL-active security inks. We describe recent advances in CPL analysis and read-out technologies that have expedited CPL-active security ink applications. Further, we provide a systematic meta-analysis of strongly CPL-active Euiii, Tbiii, Smiii, Ybiii, Cmiii, Dyiii and Criii complexes, discussing the suitability of their photophysical properties and highlighting promising candidates. We conclude by providing key recommendations for the development and advancement of the field.

Isostructural Lanthanide Coordination Polymers with High Photoluminescent Quantum Yields by Effective Ligand Combination: Crystal Structures, Photophysical Characterizations, Biologically Relevant Molecular Sensing, and Anti-Counterfeiting Ink Application

Characteristically strong photoluminescence with high quantum yield and long emission lifetime plays vital roles for the sensing performance of functional lanthanide complexes. To enhance the energ...

Preparation of 1, 3, 6, 8-Pyrenesulfonic Acid Tetrasodium Salt Dye-Doped Silica Nanoparticles and Their Application in Water-Based Anti-Counterfeit Ink.

In order to improve the luminescent stability of water-based anti-counterfeit ink, a new fluorescent material is prepared by doping dye into silica nanoparticles. Water soluble anionic dye 1, 3, 6, 8-pyrenesulfonic acid sodium salt (PTSA) is selected as the dopant. In this work, PTSA is successfully trapped into silica nanoparticles (SiNPs) by the reverse microemulsion method using cationic polyelectrolyte poly (dimethyl diallyl ammonium chloride; PDADMAC) as a bridge. The UV absorption spectra, fluorescence emission spectra and fluorescent decay curves are used to describe the luminescent properties of the PTSA-doped silica nanoparticles (PTSA-SiNPs). In addition, the as-prepared PTSA-SiNPs and polyurethane waterborne emulsion are used to prepare water-based anti-counterfeit ink, and fluorescent patterns are successfully printed through screen-printing. The samples printed by the ink exhibit desirable fluorescence properties, heat stability, robust photostability, and a fluorescent anti-counterfeit effect, which makes the PTSA-SiNPs promising luminescent materials for anti-counterfeit applications.

Combining phytate treatment and nanocellulose stabilization for mitigating iron gall ink damage in historic papers

Because of its acidic and oxidative nature, iron gall ink promotes the endogenous degradation of paper manuscripts. Mechanical damage in areas of concentrated ink application or along mechanically stressed edges or folds results in problems during storage and handling. So far, such strongly degraded areas have usually been stabilized locally with thin Japanese paper and adhesives. A new and innovative material—nanocellulose—is being evaluated as a stabilizer for manuscripts that have been degraded by iron gall ink. The aim of this study is to integrate the nanocellulose application into a multi-stage calcium phytate/calcium hydrogencarbonate treatment to combine deacidification and stabilization, thus avoiding an additional stabilization and drying step. Two different types of fibrillated nanocelluloses were applied on manuscripts damaged by iron gall inks in different treatment steps. The newly formed, interlinked network of nanocellulose and paper was characterised before and after accelerated degradation in closed vials. The effects on the paper cellulose were studied by size exclusion chromatography and light scattering with carbonyl group profiling to follow cellulose hydrolysis and oxidation pathways. In addition, the migration behavior of iron ions was examined by laser ablation coupled with metal analysis (ICP-MS). This paper discusses the applicability and stability of nanocellulose on paper damaged by iron gall ink with regard to its long-term performance. Advantages and limitations are covered in detail.