无墨喷水可重复打印纸工业化制备

“无墨喷水打印”技术因其绿色环保的特点引起了广泛关注,推进无墨喷水可重复打印纸的产业化具有重要的意义。 本文以具有水致变色性质的吲哚并[2,1-b]噁唑啉染料分子(TM)为例,选定聚对苯二甲酸乙二醇酯(PET)代替滤纸基材,通过筛选合适的表面活性剂、调整染料用量以及涂层厚度,探究并得到了一种无墨喷水可重复打印纸的工业化制备工艺。 结果表明,利用优化后的制备工艺得到的无墨喷水可重复打印纸具有良好的可重复书写性能,并通过小量生产测试验证该制备工艺可以应用于实际工业生产。     

荧烷染料的光诱导显色反应和机制的研究

荧烷染料是一类重要的功能性染料,广泛地应用于热敏和压敏记录材料.通常采用在酸作用下,使荧烷染料发生显色反应,由内酯环结构的无色体生成开环结构的有色体.并且通过吨环上不同取代基得到各种色调.荧烷染料有色体不稳定,在一般有机介质中容易发生褪色反应,使得荧烷染料作为记录介质普遍存在着色稳定性差、保存期短的缺点.为了改善有色体的稳定性,人们进行了大量的工作^[1-3],但均未取得重要进展.考虑到荧烷染料母核上带有烷胺基取代基,具有电子给体特性,有可能通过电子转移反应的途径进行显色反应.实现这种电子转移显色过程的关键问题是选择合适的电子受体.为此采用盐类化合物如碘盐和硫盐作为电了受体,因为它们容易和不同电子给体组成电子转移光敏反应体系^[4-6].因此,本文研究了以荧烷染料为电子给体和碘盐为电子受体的光致电子转移显色反应,并提出了显色反应机制.     

磷腈-紫精聚合物的合成与电致变色性能

以六氯环三磷腈作为核心、 紫精为电致变色活性基, 合成了一种新型有机-无机杂化电致变色材料——六(1-乙基-4,4'-联吡啶-甲基苯氧基)环三磷腈(PHV ²⁺). 通过傅里叶变换红外光谱(FTIR)、 X射线衍射(XRD)及核磁共振氢谱( ¹H NMR)表征了PHV ²⁺的结构. 优良的水溶性使得该化合物可以通过简单的方法构造一个以聚乙烯醇(PVA)为凝胶基质的电致变色水凝胶, 具有成本低廉及无毒害的优点. 以氟掺杂氧化锡(FTO)涂层玻璃作为电极材料, PHV ²⁺作为电致变色材料制备了PHV ²⁺/PVA/KCl电致变色器件(PHV ²⁺/PVA/KCl ECD). 该电致变色器件在2.1 V电压下由淡黄色变为紫色, 颜色变化明显, 并且该颜色变化可以循环500次; 器件在526 nm处的光学对比度达到62.19%. 良好的电致变色性质使该化合物在电致变色器件方面具有潜在应用价值.     

荧烷内酯染料的溶剂、热和光致变色性能

荧烷染料的发展已经历了一百多年的历史,而把荧烷内醋应用在热敏变色记录材料上,则是本世纪七十年代开始的,经20多年的研究开发,已广泛应用于热打印纸、传真用纸及压敏记录纸等方面,其研究的热点主要集中在改善耐光、耐油、耐溶剂等性能及提高记录材料及信息材料的储存稳定性方面。     

基于荧烷的一种化学反应型探针对S~(2-)的识别研究

通过自制荧烷化合物(Flu)合成了一种基于荧烷染料的新型S~(2-)(H_2S)探针Flu-S,并利用核磁共振及高分辨质谱对其结构进行表征、确认。在含0.001 mol/L十六烷基三甲基溴化铵(CTAB)的0.01 mol/L磷酸盐缓冲溶液(pH=7.4)中,考察了Flu-S对S~(2-)的紫外-可见吸收光谱、荧光发射光谱响应。研究表明,Flu-S在众多分析物中对S~(2-)具有高选择性光谱响应,响应时间为30 min,在波长551 nm处其吸光度与S~(2-)的浓度(3～50μmol/L)之间线性关系良好,检测限可达1.5μmol/L,检测pH范围为4～8。将该探针用于实际纯净水、自来水及化肥厂废水水样中S~(2-)的测定,回收率在97.75%～102.16%之间。     

荧烷染料/二芳基碘鎓盐同步光生色和光聚合体系

荧烷染料(FR)和二芳基碘盐(On⁺X^-)组成的体系,在光作用下,通过激发态的荧烷染料与碘盐之间发生电子转移反应,生成开环结构的荧烷染料有色体,伴随发生盐的光解反应,生成活性引发自由基碎片。该体系不仅可有效地引发烯类单体的聚合反应,也可同步发生光生色作用,产生较高的色密度。进一步研究了二芳基碘盐的取代基不同碳链长度和不同对离子及浓度诸因素,在光固化体系中对生色反应的影响。同时FR/On⁺X^-体系引发光交联形成的有色薄膜具有良好的色稳定性。     

有机荧光分子2-氰基-3-(3, 4-二甲氧基苯基)-2-丙烯酰胺的可逆压致变色和质子刺激响应性能

设计合成了3-芳基-2-腈基丙烯酰胺类有机发光小分子2-氰基-3-(3, 4-二甲氧基苯基)-2-丙烯酰胺(CDMPA)。经研究发现, CDMPA化合物具有明显的压致变色和酸致变色现象。在外力刺激下,化合物CDMPA荧光最大发射峰发生20 nm的红移,经过加热或蒸汽处理后可恢复初始状态。对样品研磨前后粉末的X射线衍射图谱及荧光寿命衰减曲线进行测试分析得出, CDMPA压致变色现象归因于分子构型由晶态到无定形态的转化。另外,在酸刺激下CDMPA发光颜色由蓝光红移至黄光,最大发射波长红移33 nm。经过二甲基甲酰胺(DMF)处理后可恢复到初始状态。由测试得到的红外光谱及分子轨道理论计算推测,酸致变色现象是由氨基取代基的质子化影响了CDMPA前线分子轨道引起的。本研究可使人们深入了解这种类型材料的多刺激响应发光机制,且显著的颜色变化性能使CDMPA在传感器和检测装置方面具有潜在的应用前景。     

芳吡唑啉乙烯基(口恶)唑烷并二氢吲哚的合成和变色性

某些芳乙烯基取代的(口恶)唑烷并二氢吲哚具有光(热)和电致变色性质,在非银盐成像等领域有应用价值.芳基吡唑啉是较强的电子给体,若用它替换上述化合物中的芳基,可能对其光谱及变色性产生有益的影响。为此,我们用Vilsmeier反应将3种芳基吡唑琳甲酰化得到醛     

有机荧光分子2-氰基-3-(3,4-二甲氧基苯基)-2-丙烯酰胺的可逆压致变色和质子刺激响应性能（英文）

设计合成了3-芳基-2-腈基丙烯酰胺类有机发光小分子2-氰基-3-(3,4-二甲氧基苯基)-2-丙烯酰胺(CDMPA)。经研究发现,CDMPA化合物具有明显的压致变色和酸致变色现象。在外力刺激下,化合物CDMPA荧光最大发射峰发生20 nm的红移,经过加热或蒸汽处理后可恢复初始状态。对样品研磨前后粉末的X射线衍射图谱及荧光寿命衰减曲线进行测试分析得出,CDMPA压致变色现象归因于分子构型由晶态到无定形态的转化。另外,在酸刺激下CDMPA发光颜色由蓝光红移至黄光,最大发射波长红移33 nm。经过二甲基甲酰胺(DMF)处理后可恢复到初始状态。由测试得到的红外光谱及分子轨道理论计算推测,酸致变色现象是由氨基取代基的质子化影响了CDMPA前线分子轨道引起的。本研究可使人们深入了解这种类型材料的多刺激响应发光机制,且显著的颜色变化性能使CDMPA在传感器和检测装置方面具有潜在的应用前景。     

含萘酰亚胺基元的水杨醛席夫碱的合成及其溶致变色效应

将N-2-（-2-羟乙氧基）乙基4肼基-1,8-萘酰亚胺与水杨醛缩合得到-种新型席夫碱化合物N-（2-（2-羟乙氧基）乙基）4-（2-羟基苯甲醛腙肼基）-1,8-萘酰亚胺（Ⅰ）,对化合物Ⅰ在不同溶剂中的光谱性质研究发现,其表现出特殊的紫外吸收和荧光双重溶致变色效应,可作为荧光分子探针获得应用．对化合物Ⅰ在不同pH值的乙醇水溶液中的光谱性质进行研究,发现该化合物不仅表现出酸碱变色行为,而且具有质子调控荧光分子开关功能及化学荧光传感器特性,有望在酸碱指示剂、分子开关和化学荧光传感器等方面获得应用．     

Off-on/On-off Dual-Mode Hydrochromic Materials：Water-Induced Acidity Changes in the Microenvironment Regulate the Color Switching of Rhodamine Derivatives北大核心CSCD

Based on the phenomenon that rhodamine derivatives（4-N-acrylamide-（3',6'-bis（diethylamino）-spiro［isobenzofuran-1,9'-xanthene］-3-one）（AM-RhB）will open the lactone ring to display color or emit fluorescence under moderate acidic conditions（4. 425%） and fluorescence intensity modulation（>700） before and after stimulating with water,and good reversibility （> 5 times）. This work will provide a promising way for the development of new hydrochromic materials. © 2022, Science Press (China). All rights reserved.     

The Unusual Photochromic and Hydrochromic Switching Behavior of Cellulose-Embedded 1,8-Naphthalimide-Viologen Derivatives in the Solid-State

Stimuli-responsive chromic materials such as photochromics, hydrochromics, thermochromics, and electrochromics have a long history of capturing the attention of scientists due to their potential industrial applications and novelty in popular culture. However, hybrid chromic materials that combine two or more stimuli-triggered color changing properties are not so well known. Herein, we report a design strategy that has led to a series of emissive 1,8-naphthalimide-viologen dyads which exhibit unusual dual photochromic and hydrochromic switching behavior in the solid-state when embedded in a cellulose matrix. This behavior manifests as reversible solid state fluorescence hydrochromism upon changes in atmospheric relative humidity (RH), and reversible solid state photochromism upon generation of a cellulose-stabilized viologen radical cation. In this design strategy, the bipyridinium unit serves as both a water-sensitive receptor for the hydrochromic fluorophore-receptor system, and a photochromic group, capable of eliciting its own visible colorimetric response, generating a fluorescence quenching radical cation with prolonged exposure to ultraviolet (UV) light. These dyes can be inkjet-printed onto cellulose paper or drop-cast as cellulose powder-based films and can be unidirectionally cycled between three different states which can be characteristically visualized under UV light or visible light. The material's photochromism, hydrochromism, and underlying mechanism of action was investigated using computational analysis, dynamic vapor sorption/desorption isotherms, electron paramagnetic resonance spectroscopy, and variable humidity UV-Vis adsorption and fluorescence spectroscopies.     

A cationic amphiphilic tetraphenylethylene derivative with hydrochromic sensitive property: Applications in anti-counterfeiting ink and rewritable paper

Since the discovery of aggregation induced emission (AIE) phenomenon, various stimuli-responsive materials have been rapidly developed, but there are still great challenges in the application of ink printing due to the bad water solubility. In this research, a new cationic amphiphilic TPE-functionalized pyridine salt (TPE-OTs) was designed, which shows good water solubility and hydrochromic properties. The optical properties of the compound have been studied, which is equipped with the typical AIEE characteristics and TICT effect. The compound can self-assemble to form aggregates with a particle size of about 30 nm in water. What is more, the compound is responsive to the environmental humidity, whose fluorescent color changes from green to yellow as the humidity gradually increased. Based on this characteristic, we applied it to the fluorescent anti-counterfeiting ink, realizing the protection and encryption of information.     

Characterization of sulfonated azo dyes and aromatic amines by pyrolysis gas chromatography/mass spectrometry

Sixteen sulfonated and unsulfonated azo dyes as well as eleven sulfonated and unsulfonated aromatic amines were analyzed and qualitatively characterized by means of pyrolysis gas chromatography/mass spectrometry at different temperatures. Aniline and aminonaphthalene were found to be the dominant pyrolysis products of sulfonated aromatic amines and dyes. Azo dye and dye class specific key compounds such as benzidine, vinyl-p-base and 4-aminoazobenzene could be identified by pyrolysis gas chromatography/mass spectrometry of commercial acid, cationic, direct, reactive and solvent dyes. 500 degrees C was the optimal pyrolysis temperature for most of the pyrolyzed compounds. The method was applied to a dried sample of a textile wastewater concentrate from a dyeing process. Reactive azo dyes of the group of Remazol dyes and anthraquinone dyes could be identified as the major compounds of the sample. The finding of caprolactam (a printing additive) suggests that the wastewater contained effluent from a process of heat-activated printing with reactive dyes. p-Chloraniline, a banned aromatic amine, was identified. Chemical reduction of the wastewater sample prior to pyrolysis resulted in the release of volatile aromatic amines and aided the classification of several products of pyrolysis.     

A Study of Surfactants'Role in the Synthetic System of Anthraquinone-Series Colors

Solubility of dyes has been paid attention to since successive dyeing and printing operation of dyes widely applied in textile industry is carried out. However, solubility improvement of the studied dyes has seldom been reported with consideration of added relevant surfactants in the synthetic system of the dyes.     

有机染料及其在染料敏化太阳电池中的应用

在染料敏化太阳电池中,染料敏化剂分成无机染料与有机染料两大类。无机染料受稀有金属钌的制约而成本较高,开发有机染料是降低染料敏化太阳电池成本的有效手段,成为目前研究的热点。本文从有机染料敏化剂的分子设计入手,简述了染料敏化太阳电池中有机染料敏化剂的基本结构,将有机染料敏化剂分为吲哚啉类染料、香豆素类染料、三苯胺类染料、菁...     

Thioxanthylium Cations: Highly Reversible Hydrochromic Mate-rials with Tunable Color and Moisture Sensitivity

Hydrochromic materials, which change color in response to moisture, are highly sought-after due to some unique applications such as moisture detection, humidity monitoring, anti-counterfeiting, and sweat-pore mapping. We herein report a new thioxanthene-9-ols/thioxanthylium cations hydrochromic system. The hydrochromic thioxanthylium cations can be generated/regenerated by exposing a chemically stable thioxanthene-9-ol to trifluoroacetic acid (TFA). The intensely colored thioxanthylium cations can be chemically reverted to the colorless thioxanthene-9-ol. Interestingly, the conversion between thioxanthene-9-ol and its cation species was found to be highly reversible in most cases (up to 50 activation-deactivation cycles). The color and moisture-sensitivity of thioxanthylium cations were also validated to be tunable via functionalization of the thioxanthene core with different aliphatic and aromatic groups at its 9 or 2,7-positions. Finally, paper probes were prepared using solution-immersion and inkjet-printing techniques to demonstrate the system's potential applications in humidity sensing and anti-counterfeiting     

Graphene-Oxide-Based Fluoro- and Chromo-Genic Materials and Their Applications

Composite materials and their applications constitute a hot field of research nowadays due to the fact that they comprise a combination of the unique properties of each component of which they consist. Very often, they exhibit better performance and properties compared to their combined building blocks. Graphene oxide (GO), as the most widely used derivative of graphene, has attracted widespread attention because of its excellent properties. Abundant oxygen-containing functional groups on GO can provide various reactive sites for chemical modification or functionalization of GO, which in turn can be used to develop novel GO-based composites. This review outlines the most recent advances in the field of novel dyes and pigments encompassing GO as a key ingredient or as an important cofactor. The interactions of graphene with other materials/compounds are highlighted. The special structure and unique properties of GO have a great effect on the performance of fabricated hybrid dyes and pigments by enhancing the color performance of dyes, the anticorrosion properties of pigments, the viscosity and rheology of inks, etc., which further expands the applications of dyes and pigments in dyeing, optical elements, solar-thermal energy storage, sensing, coatings, and microelectronics devices. Finally, challenges in the current development as well as the future prospects of GO-based dyes and pigments are also discussed. This review provides a reference for the further exploration of novel dyes and pigments.     

四甲川苯乙烯菁染料的合成及其激光性能

合成了一系列四甲川苯乙烯菁染料。以Nd:YAG锁模激光倍频(532nm)作泵浦源,测定了染料的激光性能,包括激光调谐范围、中心激光波长、激光转换效率及稳定性。探讨了该类分子结构与其激光性能之间的关系。