荷兰Inkless发明无墨盒打印技术

日前,荷兰公司Inkless发明了一种创新性的打印技术,无需使用硒鼓/墨盒即可进行打印。将会给市值约1400万美元的黑白墨盒市场带来极大冲击。Arnaudvander Veen介绍道：“我们的打印技术有很多优势,不仅能实现耗材的零花费,而且还很环保。

The guest CH_(3)CN molecule triggers solid-state photochromism in a Cu_(2)I_(2)-based MOF for advanced time-dependent encryption and inkless erasable printing

It remains a big challenge to develop solid-state stimuli-responsive materials for time-dependent information encryption and inkless erasable printing with long retention times.Herein,a 2D Cu_(2)I_(2)-based MOF with photoresponsive spiropyran(SP)groups orderly installed on its skeleton is developed.The structural isomerization from SP to colored merocyanine(MC)form can be triggered by removing the CH_(3)CN guests.Besides,the degree of structural isomerization and the retention time can be adjusted by controlling the amount of CH_(3)CN guests,exhibiting dynamic photochromic behavior with multicolor states and tunable retention time.Based on these advantages,time-dependent information encryption is successfully achieved.Furthermore,the long retention time(>72 h)of the MC form under daylight conditions in the CH_(3)CN-removed Cu_(2)I_(2)-based MOF and good repeatability make it promising in various applications,such as temporary calendars,price-cards,billboards,and reusable identity cards.This work provides a novel design strategy to fabricate multi-functional MOF-based smart materials for challenging applications of time-dependent information encryption and inkless erasable printing.

无墨印刷技术在绿色包装中的应用研究

文章介绍了无墨印刷技术的发展历程和分类,阐述了无墨印刷技术的工作原理及其在绿色包装中的应用现状,并结合绿色包装的相关理念详细分析了数种无墨印刷技术的应用场景与优劣势,旨在为印刷包装领域的从业者提供一种新思路。

利用动态微纳结构调控颜色方法的仿真研究

随着微纳米技术的进步,利用人工制备的微纳米结构实现颜色的呈现成为了可能,开辟了无油墨印刷的新思路,＂结构色＂的研究迅速成为该领域的焦点。提出了一种基于动态周期性微纳结构阵列的颜色调控新方法。设计在周期性微结构阵列中,填充一定厚度的功能材料薄膜,通过实时控制功能材料的外部电压,精确调控微结构上下表面的高度差,以实现在同一器件表面不同预期颜色的呈现和切换。建立了微结构的物理模型,并用时域有限差分方法（finite difference time domain,FDTD）进行了仿真研究,光源采用垂直入射的线偏振光,对微纳结构阵列上下表面高度差及结构周期进行了参数扫描,获得了系列反射光谱,并用光谱功率积分的方法计算得到了相应的颜色系列,直观地标注在CIE1931颜色空间色品图上。仿真结果表明,当微纳结构阵列周期在100-300nm范围内时,通过调节电压改变填充的功能材料的高度,可实现全光谱范围的颜色动态调控,且反射光谱的相对峰值强度在60%左右,效率可观。该方法原理新颖,为研制动态颜色调控微器件提供了理论基础,有望在无油墨印刷、显示技术等领域获得广泛应用。

Self-erasable dynamic surface patterns via controllable elastic modulus boosting multi-encoded and tamper-proof information storage

Dynamic surface patterns(DSPs)have attracted significant interest in anti-counterfeiting,enabling information to be stored,encrypted and decrypted in response to external stimuli.However,creating dynamic surface patterns,capable of controlling wrinkling time and independently modulating different information in both wrinkled and fluorescent states,remains a tremendous challenge.These limit DSPs to further enhance tamper-proofing capacity and extend the information storage density.Here,a rationally designed patterning strategy based on controllable elastic modulus was demonstrated to fabricate self-erasable dynamic surface patterns(S-DSPs)that increase information storage density.These novel S-DSPs strategically integrated amino co-oligomers(ACOs)with the 9-anthracenemethanol(9-AM)as skin layers,designing a bilayer multi-encoding system which could carry several different types of information with wrinkled and fluorescent patterns.The ACOs with relatively low molecular weight can endow the elastic modulus of skin layers with a wide range of regulation.As a result,the difference between the compressive strain and the critical wrinkle strain in the bilayer system would be precisely modulated by photo-dimerization to form quick-response(minimum<1 min)and self-erasable(3 min–8 days)wrinkled patterns for S-DSPs.Meanwhile,the fluorescence pattern could be independently erased and reprogrammed without affecting the change in the wrinkle pattern under modulus-controlled conditions.Moreover,controllable self-erasure in S-DSPs significantly develops tamper-proof capabilities in a supply chain.This original strategy could provide a new approach to the tamper-proof,high-density,and multi-encoded information storage in the product security or inkless printing.

A Photo-Responsive Charge-Assisted Hydrogen-Bonded Organic Network with Ultra-Stable Viologen Radicals

Hydrogen-bonded organic networks(HONs)have attracted intense research interest due to their mild synthesis conditions,good solvent processability and strong reproducibility.Most HONs are constructed by electrically neutral organic ligands through intermo-lecular interactions such as weak hydrogen bonding,n-n stacking.But there are a few charge-assisted hydrogen-bonding networks(CAHONs)constructed by oppositely charged organic components.Under hydrothermal conditions,we successfully synthesized a 3D CAHON(H2CV)(H2BTEC)(1)constructed by H2CV(CV=N,N′-4,4′-bipyridine dipropionate)and H4BTEC(H_(4)BTEC=1,2,4,5-benzene-tetracarboxylic acid)through multiple charge-assisted hydrogen bonding.Upon soft X-ray,ultraviolet light or sunlight irradiation under ambient conditions,1 quickly changes from colorless to blue(IP),and kinetic calculations show that its photochromism meets first-order dynamics.Interestingly,the colored crystals IP with long-lived colored radicals will not fade after being placed for more than two months at room temperature in air,owing to the fact that the photogenerated viologen radicals can be stabilized by the abundant hydrogen bonds,the coplanar pyridinium rings and the slow electron-hole recombination.Moreover,1 is a typical direct band gap semiconductor,evidenced by the calculated band gap of 3.24 eV,in agreement with the experimental value of 3.40 eV.In view of its strong colored stability,1 is designed for distinctive inkless printing.