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Harvesting renewable mechanical energy is envisioned as a promising and sustainable way for power generation. Many recent mechanical energy harvesters are able to produce instantaneous (pulsed) electricity with a high peak voltage of over 100 V. However, directly storing such irregular high‐voltage pulse electricity remains a great challenge. The use of extra power management components can boost storage efficiency but increase system complexity. Here utilizing the conducting polymer PEDOT:PSS, high‐rate metal‐free micro‐supercapacitor (MSC) arrays are successfully fabricated for direct high‐efficiency storage of high‐voltage pulse electricity. Within an area of 2.4 × 3.4 cm2 on various paper substrates, large‐scale MSC arrays (comprising up to 100 cells) can be printed to deliver a working voltage window of 160 V at an ultrahigh scan rate up to 30 V s−1. The ultrahigh rate capability enables the MSC arrays to quickly capture and efficiently store the high‐voltage (≈150 V) pulse electricity produced by a droplet‐based electricity generator at a high efficiency of 62%, significantly higher than that (<2%) of the batteries or capacitors demonstrated in the literature. Moreover, the compact and metal‐free features make these MSC arrays excellent candidates for sustainable high‐performance energy storage in self‐charging power systems. Advanced mechanical energy harvesters, such as droplet‐based electricity generators (DEG) produce high‐voltage (>100 V) pulse electricity, whereas existing energy storage devices can only directly store such electricity at an efficiency of <2%. Here, ultrafast metal‐free large‐scale (≈100 cells) micro‐supercapacitor arrays are fully printed on paper substrates to directly store DEG‐produced high‐voltage pulse electricity at efficiency >60%.

In this article, we present the procedure of preparation of flexible electronic paper with a photosensitive azo dye layer as the key element for changing the orientation of the polarization plane. The main steps of the technology for the fabrication of flexible e-paper are reported. The possible production of Digital Mirror Devices and the roll-to-roll process is discussed. Images on flexible e-paper are demonstrated, including bank card options. The advantages of optically rewritable e-paper technology in comparison with the e-ink usually used for this purpose are highlighted. Potential applications of flexible optically rewritable e-paper include price tags for supermarkets, indoor and outdoor advertisements, smart card labels, etc.

To address the high power consumption associated with image refresh operations in EPDs, this paper proposes a low-power driving waveform that reduces the refresh power of EPDs by lowering the system’s peak power. Compared to traditional waveforms, this waveform first activates the particles before erasing them, thus reducing voltage polarity changes. Additionally, it introduces a specific duration of 0 V voltage during the activation phase based on the physical characteristics of the electrophoretic particles to reduce the voltage span. Finally, a particular duration of 0 V voltage is introduced during the erasure phase to minimize the voltage span while ensuring the stability and consistency of the reference gray scale. The experimental results demonstrate that, in standard power tests, the new driving waveform reduces the power fluctuation value by 1.33% and the energy fluctuation value by 37.24% compared to the traditional driving waveform. This reduction in refresh power also mitigates screen flicker and ghosting phenomena.

In this review we describe the reversible photoalignment effect imposed on the director in nematic liquid crystals that provides an approach for fabrication of advanced optically addressed devices. Several new concepts have been developed to render photosensitive materials during the past decade. Functional soft azo dye compounds exhibiting distinct functionalities in response to polarized light are highly desirable for fabrication of optically rewritable electronic paper. An optically rewritable element base using simple and inexpensive materials can potentially enable the development of novel environmentally friendly, paper-like gadgets with improved functionality over regular electronic paper. We argue that an optically rewritable technique is relevant for some applications, where conventional paper might be irrelevant. In particular, we have tested and discussed several techniques of color and 3D image formation. This strategy for fabrication of novel devices offers versatile methods for visualization. We also show that the intensity modulation of the irradiation light has a potential to generate improved grayscale visualization. This principle is based on the statistical distribution control of photosensitive azo dye molecules, driven by the incident polarized light. Additionally, we discuss the functional characteristics of the developed prototypes.

[Purpose/Significance] With the rapid development of international academic digital publishing, ebook sales have surpassed those of print books since 2020. Many academic libraries in the USA are adopting e-preferred book collection development policies. In recent years, China's academic ebook market has been growing rapidly, as the well-known academic publishers such as Science Press and Tsinghua University Press have successively launched their own ebook platforms, and high-quality ebook integrator platforms such as Keledge and Cxstar have emerged, leading to a qualitative leap in both the quality and quantity of Chinese academic ebooks. The rapid development of the Chinese and English ebook markets has made collaborative collection development of print and ebooks feasible, which is considered to be a good solution to the tight collection budget and insufficient library space for Chinese academic libraries. The paper aims to propose a strategic direction and implementation path for collaborative collection d

A comprehensive theory of light-reflective characteristics and experimental technique of liquid crystal layer thickness control for flexible optically rewritable electronic paper is presented. Cylindrical pillars were used to control the gap between flexible substrates. The introduced prototype of optically rewritable electronic paper has shown very promising performance. In this regard, we report theoretical results of structural photosensitive alignment of nematic liquid crystals on flexible substrate. The focus of theoretical study is on understanding the self-assembled complex structure, governed by the interplay between surface anchoring and liquid crystal elasticity. Mueller matrix spectroscopic ellipsometry was used to study light-reflecting characteristics and polarization properties of the twisted nematic film.

A method is proposed to impregnate regular cellulosic paper with semi-conductive particles of copper sulfide. The method consists of a simple two-step procedure: first, metal (Cu) ions in solution are applied to the paper, and second, the aqueous application of a source of sulfide ions, which leads to the spontaneous formation of metal sulfides in the pores of the paper matrix, as evidenced by a color change. This methodology is easy to implement and involves very low-cost and easily available chemical agents, leading to the production of low-price semiconductor devices. In this work, the microscopic morphology and crystalline structures of films were studied, as well as their optical and electrical properties. The proposed sample preparation route could potentially be implemented in further research using different metals in order to obtain tunable physical properties, such as band gap, conductivity and conductivity carrier types.

[目的/意义]针对目前高校图书馆纸质图书和电子图书业务相对独立的现状，构建纸电图书协同建设的战略部署和实施路径，为“双一流”建设背景下高校图书馆资源建设高质量发展提供借鉴。[方法/过程]引入纸电图书资源协同建设绩效评价指标，以南方科技大学图书馆为例，基于协同采选、协同管理、协同服务、协同评价4个指标探讨纸电图书协同建设的实践探索。[结果/结论]图书馆应从顶层设计、业务岗位深度融合、管理平台建设3个方面重点推进纸电图书协同建设。

Here, we demonstrate a Parafilm penetration coupled with directional laser scribing, simultaneously regulating surface wettability and underwater stability of paper‐based laser‐induced graphene (PLIG). Parafilm penetration generates an asymmetric Parafilm–paper (PP) precursor comprising a Parafilm‐rich front surface (PP‐F) and a cellulose‐rich back surface (PP‐B). Subsequent laser scribing to either side yields PP‐derived LIG (PP‐LIG) with porous graphitic structures and good electrical conductivity (∼100 Ω/sq). This process produces distinct interfacial properties: a hydrophobic and water‐adhesive PP‐F‐LIG and a superhydrophobic, non‐adhesive PP‐B‐LIG. The resulting surface wettability and adhesion enable surface‐dependent electrochemical kinetics, suppress humidity‐induced resistance variations to below 0.6% at 90% relative humidity, maintain stable performance under prolonged water immersion without delamination, and exhibit consistent electrical and wetting properties across samples, indicating good reproducibility. Leveraging these tailored surface properties, PP‐LIG enables liquid sensing of various organic solvents, encapsulation‐free underwater pressure sensing with a sensitivity of 2.38 kPa−1, and self‑propelled catalytic motors operating at the liquid/air interface. This work demonstrates that stabilizing PLIG against moisture and water exposure enables reliable operation in wet environments, while the resulting asymmetric wettability and adhesion expand the scope of paper‐based devices to liquid, underwater, and dynamically changing interfaces, establishing a scalable and sustainable platform for environment‐resilient papertronics. Paper‐based electronics are attractive for sustainable and disposable devices, but often fail in wet environments. By introducing Parafilm into cellulose paper combined with laser conversion, two graphene surfaces with different water interactions are created. This design stabilizes paper‐based graphene in humid and underwater conditions and enables liquid sensing, underwater pressure sensing, and catalytic micromotors.

Paper, an inexpensive material with natural biocompatibility, non‐toxicity, and biodegradability, allows for affordable and cost‐effective substrates for unconventional advanced electronics, often called papertronics. On the other hand, polymeric elastomers have shown to be an excellent success for substrates of soft bioelectronics, providing stretchability in skin wearable technology for continuous sensing applications. Although both materials hold their unique advantageous characteristics, merging both material properties into a single electronic substrate reimagines paper‐based bioelectronics for wearable and patchable applications in biosensing, energy generation and storage, soft actuators, and more. Here, a breathable, light‐weighted, biocompatible engineered stretchable paper is reported via coaxial nonwoven microfibers for unconventional bioelectronic substrates. The stretchable papers allow intimate bioconformability without adhesive through coaxial electrospinning of a cellulose acetate polymer (sheath) and a silicone elastomer (core). The fabricated cellulose‐silicone fibers exhibit a greater percent strain than commercially available paper while retaining hydrophilicity, biocompatibility, combustibility, disposable, and other natural characteristics of paper. Moreover, the nonwoven stretchable cellulose‐silicone fibrous mat can adapt conventional printing and fabrication process for paper‐based electronics, an essential aspect of advanced bioelectronic manufacturing. Paper, an inexpensive material with natural properties, allows for cost‐effective and patternable substrates for unconventional advanced electronics, often called papertronics. However, papertronics are limited by their mechanical mismatch with the epidermal layer of skin. By integrating elastomeric properties within the paper fibers, forming networks of coaxial fibers (silicone and cellulose) reimagines paper‐based bioelectronics with stretchable characteristics for wearable applications.