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Preparation and Structure-Property Regulation Mechanism of Reversible Thermochromic Polydiacetylene

Chinese Journal of Polymer Science 2024年第8期42卷 1111-1121页

作者： Zhi-Qing Ge Shuo Yan Zu-Xiong Pan Shan Lei Xuan-Zhi Mao Chu Zhao Mo-Zhen Wang Xue-Wu Ge Key Laboratory of Precision and Intelligent Chemistry Department of Polymer Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026China Marshall Laboratory of biomedical Engineering International Cancer CenterLaboratory of Evolutionary Theranostics(LET)School of Biomedical EngineeringShenzhen University Medical SchoolShenzhen UniversityShenzhen 518055China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of sciences Beijing 100049China

The thermochromic mechanism and the structure-property regulation principle of reversible thermochromic polydiacetylene(PDA)materials have always been a challenging *** this work,a series of diacetylene monomers(m-PCDA)containing phenyl and amide or carboxyl groups were synthesized from 10,12-pentacosadiynoic acid(PCDA)through the esterification or amidation *** effects of the number and the distribution of the functional groups in m-PCDA molecules on their solid-state polymerization capability,and the thermochromic mechanism of their corresponding polymers(m-PDA)were investigated and discussed in *** results show that the m-PCDA monomers containing both benzene ring and groups that can form hydrogen bonding interactions have strong intermolecular interaction,and are easy to carry out the solid phase polymerization under 254-nm UV irradiation to obtain the corresponding new thermochromic m-PDA *** thermochromic behavior of m-PDA depends on its melting *** initial color-change temperature(blue to red)is determined by the onset melting tem perature,and the temperature range in which reversible color recovery can be achieved by repeat heating-cooling treatment is determined by its melting *** to the proposed thermochromic mechanism of PDA,various new PDA materials with precise thermochromic temperatu res and reversible thermochromic temperature ra nges can be designed and synthesized through the appropriate introduction of benzene ring and groups that can form hydrogen bonding interactions into the molecular structure of linear diacetylene *** work provides a perspective to the precise molecular structure design and the property regulation of the reversible thermochromic PDA materials.

关键词： Polydiacetylene Thermochromism Hydrogen bonding Chemical modification

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Memory-enhanced text style transfer with dynamic style learning and calibration

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Science China(Information sciences) 2024年第4期67卷 181-196页

作者： Fuqiang LIN Yiping SONG Zhiliang TIAN Wangqun CHEN Diwen DONG Bo LIU College of Computer Science and technology National University of Defense Technology department of Computer Science and Engineering The Hong Kong University of Science and Technology Strategic Assessments and Consultation Institute Academy of Military Sciences

Text style transfer aims to rephrase a sentence to match the desired style while retaining the original content. As a controllable text generation task, mainstream approaches use content-independent style embedding as control variables to guide stylistic generation. Nonetheless, stylistic properties are contextsensitive even under the same style. For example, “delicious” and “helpful” convey positive sentiments,although they are more likely to describe food and people, respectively. Therefore, desired style signals must vary with the content. To this end, we propose a memory-enhanced transfer method, which learns fine-grained style representation concerning content to assist transfer. Rather than employing static style embedding or latent variables, our method abstracts linguistic characteristics from training corpora and memorizes subdivided content with the corresponding style representations. The style signal is dynamically retrieved from memory using the content as a query, providing a more expressive and flexible latent style space. To address the imbalance between quantity and quality in different content, we further introduce a calibration method to augment memory construction by modeling the relationship between candidate *** results obtained using three benchmark datasets confirm the superior performance of our model compared to competitive approaches. The evaluation metrics and case study also indicate that our model can generate diverse stylistic phrases matching context.

关键词： style transfer memory-enhanced method text generation deep learning text representation

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Displacement-pressure biparametrically regulated softness sensory system for intraocular pressure monitoring

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National Science Review 2024年第6期11卷 159-168页

作者： Yu Cheng Yifei Zhan Fangyi Guan Junli Shi Jingxiao Wang Yi Sun Muhammad Zubair Cunjiang Yu Chuan Fei Guo department of Materials Science and Engineering Southern University of Science and Technology department of Engineering Science and Mechanics Pennsylvania State University department of biomedical Engineering Pennsylvania State University department of Materials Science and Engineering Materials Research Institute Pennsylvania State University

High intraocular pressure(IOP) is one of the high-risk pathogenic factors of glaucoma. Existing methods of IOP measurement are based on the direct interaction with the cornea. Commercial ophthalmic tonometers based on snapshot measurements are expensive, bulky, and their operation requires trained *** contact lenses are easy to use, but they may block vision and cause infection. Here, we report a sensory system for IOP assessment that uses a soft indentor with two asymmetrically deployed iontronic flexible pressure sensors to interact with the eyelid-eyeball in an eye-closed situation. Inspired by human fingertip assessment of softness, the sensory system extracts displacement-pressure information for soft evaluation, achieving high accuracy IOP monitoring(>96%). We further design and custom-make a portable and wearable ophthalmic tonometer based on the sensory system and demonstrate its high efficacy in IOP screening. This sensory system paves a way towards cost-effective, robust, and reliable IOP monitoring.

关键词： intraocular pressure tonometer deep learning softness iontronic sensor

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Soft,body conformable electronics for thermoregulation enabled by kirigami

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Bio-Design and Manufacturing 2024年第4期7卷 453-462页

作者： Lung Chow Guangyao Zhao Pengcheng Wu Xingcan Huang Jiyu Li Jian Li Wanying Wang Guihuan Guo Zhiyuan Li Jiachen Wang Jingkun Zhou Yawen Yang Yuyu Gao Binbin Zhang Qiang Zhang Dengfeng Li Ya Huang Kuanming Yao Jian Lu Xinge Yu department of biomedical Engineering City University of Hong KongHong Kong 999077China Hong Kong Centre for Cerebro-Cardiovascular Health Engineering Hong Kong 999077China department of biomedical sciences City University of Hong KongHong Kong 999077China department of Mechanical Engineering City University of Hong KongHong Kong 999077China

The application of thermoelectric devices(TEDs)for personalized thermoregulation is attractive for saving energy while balancing the quality of *** that directly attach to human skin remarkably minimized the energy wasted for cooling the entire ***,facing the extreme dynamic geometry change and strain of human skin,conventional TEDs cannot align with the contour of our bodies for the best thermoregulation ***,we designed a kirigami-based wearable TED with excellent water vapor permeability,flexibility,and *** analysis and experimental results reveal that our product can withstand various types of large mechanical deformation without circuit *** stated outcome and proposed facile approach not only reinforce the development of wearable TEDs but also offer an innovative opportunity for different electronics that require high conformability.

关键词： Thermoregulation Thermoelectric Kirigami Body conformable Wearable

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Tetherless Optical Neuromodulation:Wavelength from Orange-red to Mid-infrared

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Neuroscience Bulletin 2024年第8期40卷 1173-1188页

作者： Chao Sun Qi Fan Rougang Xie Ceng Luo Bingliang Hu Quan Wang Key Laboratory of Spectral Imaging technology Xi'an Institute of Optics and Precision Mechanics(XIOPM)Chinese Academy of SciencesXi'an 710119China Key Laboratory of biomedical Spectroscopy of Xi'an Key Laboratory of Spectral Imaging TechnologyXIOPMChinese Academy of SciencesXi'an 710119China department of Neurobiology School of Basic MedicineFourth Military Medical UniversityXi'an 710032China

Optogenetics,a technique that employs light for neuromodulation,has revolutionized the study of neural mechanisms and the treatment of neurological disorders due to its high spatiotemporal resolution and cell-type ***,visible light,particularly blue and green light,commonly used in conventional optogenetics,has limited penetration in biological *** limitation necessitates the implantation of optical fibers for light delivery,especially in deep brain regions,leading to tissue damage and experimental *** overcome these challenges,the use of orange-red and infrared light with greater tissue penetration has emerged as a promising approach for tetherless optical *** this review,we provide an overview of the development and applications of tetherless optical neuromodulation methods with long *** first discuss the exploration of orange-red wavelength-responsive rhodopsins and their performance in tetherless optical ***,we summarize two novel tetherless neuromodulation methods using near-infrared light:upconversion nanoparticle-mediated optogenetics and photothermal *** addition,we discuss recent advances in mid-infrared optical neuromodulation.

关键词： Optical neuromodulation Tetherless Orange-red wavelength responding rhodopsins Upconversion nanoparticle-mediated optogenetics Photothermal neuromodulation

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A comprehensive review on surface modifications of black phosphorus using biological macromolecules

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Frontiers of Materials Science 2024年第2期18卷 37-59页

作者： Chaiqiong Guo Xuhong He Xuanyu Liu Yuhui Wang Yan Wei Ziwei Liang Di Huang department of biomedical Engineering Research Center for Nano-biomaterials&Regenerative MedicineCollege of Biomedical EngineeringTaiyuan University of TechnologyTaiyuan 030024China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030032China

Black phosphorus(BP),a novel two dimensional material,exhibits remarkable photoelectric characteristics,ultrahigh photothermal conversion efficiency,substantial specific surface area,high carrier mobility,and tunable band gap *** attributes have positioned it as a promising candidate in domains such as energy,medicine,and the ***,its vulnerability to light,oxygen,and water can lead to rapid degradation and loss of crystallinity,thereby limiting its synthesis,preservation,and ***,BP has demonstrated cytotoxic tendencies,substantially constraining its viability in the realm of ***,the imperative for surface modification arises to bolster its stability and biocompatibility,while concurrently expanding its utility *** macromolecules,integral components of living organisms,proffer innate advantages over chemical agents and polymers for the purpose of the BP *** review comprehensively surveys the advancements in utilizing biological macromolecules for the modifications of *** doing so,it aims to pave the way for enhanced stability,biocompatibility,and diversified applications of this material.

关键词： blackphosphorus tumor therapy biocompatibility surface modification biomacromolecule

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Praseodymium metal nanorods as a 5-fluorouracil carrier

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Journal of Rare Earths 2024年第7期42卷 1328-1336,I0005页

作者： Varnitha Manikantan Govindaraj Sri Varalakshmi Ujma Ashapak Tamboli Archana Sumohan Pillai Aleyamma Alexander Anushka Lucas Bose Allben Akash Israel V.M.V.Enoch Centre for Nanoscience and Genomics Karunya Institute of Technology and Sciences(Deemed University)Coimbatore641114Tamil NaduIndia department of Applied Chemistry Karunya Institute of Technology and Sciences(Deemed University)Coimbatore641114Tamil NaduIndia

Interest in metal nanoparticles as nanoscale drug-carrying vehicles has been *** such an aspect,lanthanide metal nanoparticles are particularly ***,we report praseodymium nanoparticles as a novel anticancer therapeutic transporting *** material was made as a composite with the supramolecular host polymer,poly-β-*** praseodymium nanorods were characterized using standard analytical techniques,including X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),and thermogravimetric analysis(TGA).In addition,they were imaged using transmission electron *** nanostructures are a long rod-shaped material with 2.0±0.1μm in length and 230±10 nm in *** material shows a saturation magnetization value above 30 emu/g with a coercivity value of 130 *** nanocarrier is freighted with the drug 5-fluorouracil,and the encapsulation efficiency is 76.09%.The drug release is continuous from the nanocarrier(polymer-containing praseodymium nanoparticles)and proceeds for above 250 *** in vitro cytotoxicities of the blank nanocarrier and the 5-fluorouracil-loaded one are deduced by testing them on MCF-7 and Vero(non-cancerous)cell *** cytotoxicity on the cancerous cell lines is observed,whereas the non-cancerous cells are *** IC_(50)values on the cell lines are reported.

关键词： Metal nanoparticles Praseodymium Poly-cyclodextrin Drug delivery Anticancer activity Rare earths

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Wireless powering solution for implantable electronics based on ultra-low frequency magnetic energy focusing

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National Science Review 2024年第6期11卷 92-93页

作者： Haoyu Wang Xinge Yu department of biomedical Engineering City University of Hong Kong

Implantable electronic devices play a crucial role at the frontiers of human health monitoring, disease diagnosis and medical treatment. With the development of their functionality, powering strategies have become a critical issue. However, with existing powering solutions,batteries have a limited lifetime [1]; selfpowered devices exhibit unstable and constrained output [2];

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Recent advances in droplet-based microfluidics in liquid biopsy for cancer diagnosis

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Droplet 2024年第1期3卷 1-27页

作者： Jingyu Shi Yu Zhang Yadi Fan Yi LiuMo Yang department of biomedical Engineering The Hong Kong Polytechnic UniversityHong KongChina department of Mechanical and Automotive Engineering Royal Melbourne Institute of TechnologyMelbourneAustralia

Liquid biopsy,a noninvasive technique to obtain tumor information from body fluids,is an emerging technology for cancer diagnosis,prognosis,and monitoring,providing crucial support for the realization of precision *** main biomarkers of liquid biopsy include circulating tumor cells,circulating tumor DNA,microRNA,and circulating tumor *** liquid biopsy detection methods include flow cytometry,immunoassay,polymerase chain reaction(PCR)-based methods,and next-generation sequencing(NGS)-based methods,which are time-consuming,labor-intensive,and cannot reflect cell ***-based microfluidics with high throughput,low contamination,high sensitivity,and single-cell/single-molecule/single-exosome analysis capabilities have shown great potential in the field of liquid *** review aims to summarize the recent development in droplet-based microfluidics in liquid biopsy for cancer diagnosis.

关键词： diagnosis biopsy fluid

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Spatiotemporal Distributions of Bacterioplankton Communities in the Qiantang River(Hangzhou Section),China

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Journal of Ocean University of China 2024年第4期23卷 1102-1114页

作者： XU Jiaojiao ZHAO Li LUKWAMBE Betina NICHOLAUS Regan ZHU Jinyong YANG Wen ZHENG Zhongming School of Marine sciences Ningbo UniversityNingbo 315211China School of Aquatic sciences and Fisheries technology University of Dar es SalaamDar es SalaamTanzania department of Natural sciences Mbeya University of Science and TechnologyMbeyaTanzania

The spatial and temporal distribution of bacterioplankton communities plays a vital role in understanding the ecological dynamics and health of aquatic *** this study,we conducted a comprehensive investigation of the bacterioplankton communities in the Qiantang River(Hangzhou section).Water samples were collected quarterly from seven sites over a one-year *** and chemical parameters,including dissolved oxygen(DO),water temperature(WT),chemical oxygen demand(COD),nitrite(NO_(2)^(-)),active phosphate(PO_(4)^(3-))and other indices were *** this study,theαdiversity,βdiversity and abundance differences of bacterial communities were investigated using 16S rRNA high-throughput sequencing *** spatial and temporal distribution characteristics and main driving factors of the bacterioplankton community structure and diversity were *** results showed that a total of 57 phyla were detected in the bacterioplankton community,among which Proteobacteria and Actinomycetes were the two dominant groups with the highest relative *** results of PCoA based on Bray-Curtis distance showed that the sampling season had a slightly greater effect on the changes in bacterioplankton community structure in the Qiantang *** and partial Mantel test showed that environmental variables(Mantel r=0.6739,P<0.0001;partial Mantel r=0.507,P=0.0001)were more important than geographical distance(Mantel r=0.5322,P<0.001;partial Mantel r=0.1563,P=0.001).The distance attenuation model showed that there was significant distance attenuation in all four seasons,and the maximum limit of bacterial community diffusion was found in *** analysis showed that nine environmental factors,including COD,WT and DO,significantly affected community distribution(P<0.05).This study provides valuable insights into the spatial and temporal distribution characteristics of bacterioplankton communities,shedding light on their ecological roles in the Qiantang R

关键词： Qiantang River bacterioplankton community spatial and temporal distribution 16S rRNA range attenuation

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