IF 7 1区化学

GIANT Pub Date : 2024-05-08 DOI: 10.1016/j.giant.2024.100273

Ziyue Zhao , Lingchen Kong , Jinxu Sun , Yu Li , Wei Feng

{"title":"Fluorinated polymer-derived microporous carbon spheres for CFx cathodes with high energy density","authors":"Ziyue Zhao , Lingchen Kong , Jinxu Sun , Yu Li , Wei Feng","doi":"10.1016/j.giant.2024.100273","DOIUrl":"https://doi.org/10.1016/j.giant.2024.100273","url":null,"abstract":"<div><p>Fluorinated carbon (CF<em><sub>x</sub></em>) compounds have extensive applications in lithium primary battery cathodes owing to their high energy density. In this investigation, a novel CF<em><sub>x</sub></em> compound offering superior electrochemical properties was synthesized via a low-temperature fluorination process, utilizing Pluronic F127 as a template agent and microporous carbon spheres produced through soft template-assisted high-temperature carbonization and chemical activation as precursors, and by regulating the amount of soft template F127 added. The reduction in microsphere size, narrower particle size distribution, and introduction of defects contribute to augmenting the molar ratio of F to C (F/C) of CF<em><sub>x</sub></em> while preserving the electrochemical activity of C-F bonds. The specific capacity of fluorinated polymer-derived microporous carbon spheres (FPMCSs) with a high fluorination degree rivals that of commercial fluorinated graphite (FG). The microsphere morphology and microporous structure not only furnish abundant sites for fluorination reactions in electrode processes but also facilitate Li<sup>+</sup> diffusion, ensuring ample rate capability. The synthesized FPMCSs exhibited a peak specific capacity of 1079 mAh g<sup>–1</sup> and a maximum energy density of 2679 Wh kg<sup>–1</sup> (substantially surpassing the 2180 Wh kg<sup>–1</sup> of commercial FG). Hence, the prepared FPMCSs underscore the significance of selecting suitable carbonaceous materials and designing structures deliberately, showing promising potential for achieving high energy density in CF<em><sub>x</sub></em> cathodes in the future, employing readily available and cost-effective raw materials.</p></div>","PeriodicalId":34151,"journal":{"name":"GIANT","volume":"18 ","pages":"Article 100273"},"PeriodicalIF":7.0,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666542524000389/pdfft?md5=804308d0c891d95866de51a9fe606f35&pid=1-s2.0-S2666542524000389-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140947911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Highly stretchable alginate/methylcellulose hydrogels for 3D bio-printing: photopolymerization approach enhancing structural integrity 用于三维生物打印的高伸展性藻酸盐/甲基纤维素水凝胶：增强结构完整性的光聚合方法

IF 7 1区化学

GIANT Pub Date : 2024-05-07 DOI: 10.1016/j.giant.2024.100280

Sorour Sadeghzade , Jinrui Cao , Rui Yang , Yuanlong Li , Yanping Li , Dingcong Zhang , Jingyi Liu , Ziyue Yu , Liang Fang , Hongyan Yuan

{"title":"Highly stretchable alginate/methylcellulose hydrogels for 3D bio-printing: photopolymerization approach enhancing structural integrity","authors":"Sorour Sadeghzade , Jinrui Cao , Rui Yang , Yuanlong Li , Yanping Li , Dingcong Zhang , Jingyi Liu , Ziyue Yu , Liang Fang , Hongyan Yuan","doi":"10.1016/j.giant.2024.100280","DOIUrl":"https://doi.org/10.1016/j.giant.2024.100280","url":null,"abstract":"<div><p>In recent years, 3D hydrogels based on alginate (Alg) have undergone substantial advancements, holding transformative potential for biomedicine and regenerative medicine. Nevertheless, the viscosity of Alg needs to be further increased, in order to print complex 3D structures. Attempts to adjust printability often employ rheological modifiers like methylcellulose (MC), but these still lack mechanical integrity for broader biomedical applications. Our study sought to chemically modify Alg/MC to create a photopolymerizable hydrogel by incorporating acrylate-based monomers, which would enhance the curing ability of the base hydrogel, leading to better mechanical properties of Alg/MC, such as stretchability and stability with shape recovery. Comprehensive mechanical assessments unveiled remarkable tensile properties, achieving a notable specific strength benchmark of 44.72 kPa/(g.cm<sup>-3</sup>) before reaching the point of fracture. This represents a substantial 250 % improvement compared to samples lacking the acrylate monomer. Biomedical assessments confirmed the hydrogel's promising potential, especially with the MG-63 cell line, underscoring its suitability for advanced applications like tissue engineering.</p></div>","PeriodicalId":34151,"journal":{"name":"GIANT","volume":"18 ","pages":"Article 100280"},"PeriodicalIF":7.0,"publicationDate":"2024-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666542524000456/pdfft?md5=949c89bfeaa228f9583155f05daaa8ab&pid=1-s2.0-S2666542524000456-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140909971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Incorporation of self-heating effect into a thermo-mechanical coupled constitutive modelling for elastomeric polyurethane 将自热效应纳入弹性聚氨酯的热机械耦合构造模型中

IF 7 1区化学

GIANT Pub Date : 2024-05-06 DOI: 10.1016/j.giant.2024.100278

Jie Yang , Zisheng Liao , Deepak George , Mokarram Hossain , Xiaohu Yao

{"title":"Incorporation of self-heating effect into a thermo-mechanical coupled constitutive modelling for elastomeric polyurethane","authors":"Jie Yang , Zisheng Liao , Deepak George , Mokarram Hossain , Xiaohu Yao","doi":"10.1016/j.giant.2024.100278","DOIUrl":"https://doi.org/10.1016/j.giant.2024.100278","url":null,"abstract":"<div><p>Elastomeric polyurethane (EPU) is characterised by distinctive mechanical properties, including high toughness, low glass transition temperature, and high impact resistance, that render it indispensable in diverse engineering applications from soft robotics to anti-collision devices. This study presents a thermo-mechanically coupled constitutive model for EPU, systematically incorporating hyperelasticity, viscoelasticity, thermal expansion, and self-heating effect in a thermodynamically consistent manner. Experimental data, obtained from previous studies, are then used for parameter identification and model validation, including iterative updates for temperature parameters considering the self-heating effect. Subsequently, the validated model is integrated into finite element codes, i.e., user subroutine to define a material’s mechanical behaviour (<span>UMAT</span>) based on the commercial finite element software <span>ABAQUS</span>, for the computation of three-dimensional stress-strain states, facilitating the analysis of the structural response to various mechanical loads and boundary conditions. The results obtained from simulations are compared with analytical solutions to confirm the precision of Finite Element Method (FEM) implementation. The self-heating effect is further analysed under different strain rates and temperatures. To validate the engineering significance of the FEM implementation, a plate with a hole structure is also simulated. In conclusion, this research provides a robust tool for engineers and researchers working with soft materials, enhancing their understanding and predictive capabilities, notably addressing the self-heating effect in thermo-mechanical behaviours.</p></div>","PeriodicalId":34151,"journal":{"name":"GIANT","volume":"18 ","pages":"Article 100278"},"PeriodicalIF":7.0,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666542524000432/pdfft?md5=5603cf554db170a3f50a816f1811e2c8&pid=1-s2.0-S2666542524000432-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140918429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Itaconic acid-based 3D printed nanocomposites: An in-depth study on the effect of nanoinclusions on the physicochemical properties and the printability of formulations based on polyester itaconates 基于衣康酸的 3D 打印纳米复合材料：深入研究纳米夹杂物对基于聚酯衣康酸酯的配方的理化性质和可打印性的影响

IF 7 1区化学

GIANT Pub Date : 2024-05-03 DOI: 10.1016/j.giant.2024.100275

Lazaros Papadopoulos , Lorenzo Pezzana , Natalia Malitowski , Nikolaos Kladovasilakis , Dimitrios Tzetzis , Marco Sangermano , Dimitrios N. Bikiaris , Tobias Robert

{"title":"Itaconic acid-based 3D printed nanocomposites: An in-depth study on the effect of nanoinclusions on the physicochemical properties and the printability of formulations based on polyester itaconates","authors":"Lazaros Papadopoulos , Lorenzo Pezzana , Natalia Malitowski , Nikolaos Kladovasilakis , Dimitrios Tzetzis , Marco Sangermano , Dimitrios N. Bikiaris , Tobias Robert","doi":"10.1016/j.giant.2024.100275","DOIUrl":"10.1016/j.giant.2024.100275","url":null,"abstract":"<div><p>The demand for novel bio-based materials in UV-curing additive manufacturing has surged due to increasing environmental concerns and a growing emphasis on sustainable practices in the manufacturing industry. However, at the moment, their thermomechanical performance is not equal to that of their fossil-based counterparts and this impedes the acceptance of these materials within the industrial community. Therefore, in this study, a series of nanocomposite polyesters based on itaconic acid was synthesized for the first time with <em>in-situ</em> polymerization, in an attempt to leverage the unique properties of nanofillers and improve the overall performance of the material. A variety of reinforcing agents were utilized, namely cellulose nanocrystals (CNC), montmorillonite (MMT), graphene nanoplatelets (GNP) and titanium dioxide (TiO<sub>2</sub>), to understand the effect of each filler on the physicochemical properties of the polyester. Formulations of these polyesters were then prepared and processed on a digital light processing (DLP) 3D printer to prepare test specimens. Extensive thermomechanical characterization showed that the interference of the fillers with the UV curing process was the main parameter determining the mechanical performance of the 3D printed materials.</p></div>","PeriodicalId":34151,"journal":{"name":"GIANT","volume":"18 ","pages":"Article 100275"},"PeriodicalIF":7.0,"publicationDate":"2024-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666542524000407/pdfft?md5=0f2c1408a2efe6b636093792c27970f3&pid=1-s2.0-S2666542524000407-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141047834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Advances in shape memory polymers and their composites: From theoretical modeling and MD simulations to additive manufacturing 形状记忆聚合物及其复合材料的研究进展：从理论建模和 MD 模拟到增材制造

IF 7 1区化学

GIANT Pub Date : 2024-04-30 DOI: 10.1016/j.giant.2024.100277

Yu Li, Denvid Lau

{"title":"Advances in shape memory polymers and their composites: From theoretical modeling and MD simulations to additive manufacturing","authors":"Yu Li, Denvid Lau","doi":"10.1016/j.giant.2024.100277","DOIUrl":"https://doi.org/10.1016/j.giant.2024.100277","url":null,"abstract":"<div><p>Shape memory polymers (SMPs) and their composites have broad application prospects in multiple fields due to their unique shape memory effects. However, they still face challenges in accurately controlling the shape recovery process, improving the stability of shape memory loops, and achieving the manufacturing of complex shapes and functions. At present, theoretical models, molecular dynamics (MD) simulations, and additive manufacturing technologies have been widely applied. Theoretical models and MD simulations provide theoretical foundations at both macro and micro levels, respectively. Meanwhile, by combining SMPs and their composites with additive manufacturing, some complex structures can be produced. This not only verifies the accuracy of the theoretical foundation, but also further expands its application. This review aims to review the application and intersection of theoretical models, MD simulations, and additive manufacturing in the research of SMPs and their composites, and analyze how they jointly promote the leap from theory to application, providing valuable insights for future development trends.</p></div>","PeriodicalId":34151,"journal":{"name":"GIANT","volume":"18 ","pages":"Article 100277"},"PeriodicalIF":7.0,"publicationDate":"2024-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666542524000420/pdfft?md5=da184f509252cdf893d703853d4fb1f1&pid=1-s2.0-S2666542524000420-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140913774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Highly crystalline, heat resistant and biodegradable copolyesters from fully bio-based bis(pyrrolidone) monomer 由完全生物基双吡咯烷酮单体制成的高结晶性、耐热性和可生物降解的共聚聚酯

IF 7 1区化学

GIANT Pub Date : 2024-04-29 DOI: 10.1016/j.giant.2024.100276

Hanxu Zhu , Han Hu , Qingyang Luan , Chen Lin , Juanfang Xu , Jinggang Wang , Wu Bin Ying , Jin Zhu

{"title":"Highly crystalline, heat resistant and biodegradable copolyesters from fully bio-based bis(pyrrolidone) monomer","authors":"Hanxu Zhu , Han Hu , Qingyang Luan , Chen Lin , Juanfang Xu , Jinggang Wang , Wu Bin Ying , Jin Zhu","doi":"10.1016/j.giant.2024.100276","DOIUrl":"https://doi.org/10.1016/j.giant.2024.100276","url":null,"abstract":"<div><p>Improving the heat resistance of bio-based and biodegradable polyesters is of great significance to extend their applications. Herein, N,N’-trans-1,4-cyclohexane-bis(pyrrolidone-4-methyl carboxylate) (T-CBPMC) was prepared through efficient Michael-addition reaction between dimethyl itaconate and trans-1,4-cyclohexanediamine. The obtained T-CBPMC was copolymerized into aliphatic poly(butylene succinate) (PBS), and a series of PBSPs copolymers with T-CBPMC (BP) molar percentages between 41−80 mol % and weight average molecular weight (<em>M<sub>w</sub></em>) values ranging between 5.77*10<sup>4</sup> and 6.67*10<sup>4</sup> g/mol were prepared. BP units efficiently facilitated the melting temperature (203-251 °C) and isothermal-crystallization rate (t<sub>1/2</sub> < 20 s) of PBSPs, endowing the highest heat resistance among commercial biodegradable polyesters, which helps maintain stable in pasteurization, high-temperature disinfection, and microwave environments. Moreover, these copolymers displayed remarkable mechanical, gas barrier properties and degradability. PBSP40-PBSP60 obtained high elastic modulus (335–872 MPa) and tensile strength (24.7–31.5 MPa), and good toughness simultaneously. Multiple-ring structures and large steric hindrance of BP units resulted in superior O<sub>2</sub> barrier performance than that of non-degradable PET films. Importantly, the PBSP copolyesters showed obvious degradation in water environments and relatively better enzymatic degradation. It was interesting to find that even with 70 % of the BP units, the PBSP copolyesters still retained hydrolysis ability. The resulting PBSP copolyesters open the way for alternative candidates of biodegradable packaging materials with rapid crystallization, high heat-resistance and gas barrier.</p></div>","PeriodicalId":34151,"journal":{"name":"GIANT","volume":"18 ","pages":"Article 100276"},"PeriodicalIF":7.0,"publicationDate":"2024-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666542524000419/pdfft?md5=d9808b7b5ce1ac0abad9a74a0e77ee7c&pid=1-s2.0-S2666542524000419-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140822480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Toughening poly(lactic acid) with novel polyolefin-graft-poly(lactic acid) copolymers maintaining high transparency and stiffness 用新型聚烯烃-接枝-聚（乳酸）共聚物增韧聚（乳酸），保持高透明度和硬度

IF 7 1区化学

GIANT Pub Date : 2024-04-29 DOI: 10.1016/j.giant.2024.100274

Hao Cai , Yu Cheng , Zhenli Zhang , Li Pan , Kunyu Zhang , Yuesheng Li

{"title":"Toughening poly(lactic acid) with novel polyolefin-graft-poly(lactic acid) copolymers maintaining high transparency and stiffness","authors":"Hao Cai , Yu Cheng , Zhenli Zhang , Li Pan , Kunyu Zhang , Yuesheng Li","doi":"10.1016/j.giant.2024.100274","DOIUrl":"https://doi.org/10.1016/j.giant.2024.100274","url":null,"abstract":"<div><p>The combination of well-balanced mechanical performance, high transparency and appealing eco-friendly attributes endows poly(lactic acid) (PLA) with significantly potential for wide-ranging applications in high-value packaging sectors. However, effectively toughening PLA without compromising its transparency and stiffness remains a formidable challenge. In this study, we synthesized a series of graft copolymers by incorporating hydroxyl-functionalized linear low density polyethylene (LLDPE<sub>OH</sub>) and copolymers of cycloolefin (COC<sub>OH</sub>) as the main chain and PLA as the side chain, which were subsequently employed as novel toughening agents for commercial PLA. The achievement of high-performance PLA blends with a balanced combination of toughness, strength, and transparency can be realized through meticulous tuning of the structure and mass fraction of the blended graft copolymers. The maximum elongation at break for the PLA blends increased by about 50 times that of neat PLA, reaching up to 300 %. Furthermore, these materials retained their high strength (54 MPa) and excellent transparency (light transmittance up to 90 %). The excellent properties of PLA blends could be ascribed to the well-designed chain structure of the graft copolymer which leaded to and excellent compatibility with the PLA matrix and unique phase morphology. This work is significant in guiding the design and synthesis of graft copolymers as toughening agents for PLA, thereby expanding its application range in areas where high transparency and toughness are required.</p></div>","PeriodicalId":34151,"journal":{"name":"GIANT","volume":"18 ","pages":"Article 100274"},"PeriodicalIF":7.0,"publicationDate":"2024-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666542524000390/pdfft?md5=5b165729591314c099e09330793d87f8&pid=1-s2.0-S2666542524000390-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140822481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hydrogel Nanocomposite Based Slow-Release Urea Fertilizer: Formulation, Structure, and Release Behavior 基于水凝胶纳米复合材料的缓释尿素肥料：配方、结构和释放行为

IF 7 1区化学

GIANT Pub Date : 2024-04-27 DOI: 10.1016/j.giant.2024.100270

Kezhu Lu , Ragab Abouzeid , Qinglin Wu , Qibing Chen , Shiliang Liu

{"title":"Hydrogel Nanocomposite Based Slow-Release Urea Fertilizer: Formulation, Structure, and Release Behavior","authors":"Kezhu Lu , Ragab Abouzeid , Qinglin Wu , Qibing Chen , Shiliang Liu","doi":"10.1016/j.giant.2024.100270","DOIUrl":"https://doi.org/10.1016/j.giant.2024.100270","url":null,"abstract":"<div><p>To enhance the nitrogen utilization efficiency of fertilizers, we developed a novel slow-release fertilizer hydrogel through free radical polymerization, incorporating lignin-containing cellulose nanofiber (LCNF), clinoptilolite (CL), urea, and acrylic acid (AA)-co-acrylamide (AAm) polymer. Various analytical techniques were utilized to examine the structure, swelling, and release behaviors of the fabricated hydrogels with varying LCNF concentrations. The results indicated that the addition of 10% LCNF led to a decrease in water absorption from 72.44 g g<sup>−1</sup> to 24.04 g g<sup>−1</sup>. However, re-swelling was significantly enhanced, with a reduction in re-swelling capacity loss from 32.91% to 23.52%. Concurrently, water retention capacity notably increased from 18.03% to 39.20%. The hydrogel containing 10% LCNF exhibited a slower urea release over 30 days. The kinetic studies revealed that the swelling and urea release behaviors align well with the second-order kinetics model and the Peppas-Sahlin model, respectively. In summary, the developed LCNF/CL/(AA-co-AAm)/urea hydrogel nanocomposites present a novel strategy for the future production and utilization of slow-release fertilizers in agricultural and horticultural fields.</p></div>","PeriodicalId":34151,"journal":{"name":"GIANT","volume":"18 ","pages":"Article 100270"},"PeriodicalIF":7.0,"publicationDate":"2024-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666542524000353/pdfft?md5=2506c4459221a8f7164f8a324e91588e&pid=1-s2.0-S2666542524000353-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140843740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Discotic Mesogenic near-infrared absorbing dye and its application in photo-responsive liquid crystal elastomers 一种 Discotic Mesogenic 近红外吸收染料及其在光响应液晶弹性体中的应用

IF 7 1区化学

GIANT Pub Date : 2024-04-26 DOI: 10.1016/j.giant.2024.100271

Shimin Shao , Miao Bao , Ruohan Chen , Zhenghao Zhang , Haifeng Lu , Meng Wang , Hong Yang

{"title":"A Discotic Mesogenic near-infrared absorbing dye and its application in photo-responsive liquid crystal elastomers","authors":"Shimin Shao , Miao Bao , Ruohan Chen , Zhenghao Zhang , Haifeng Lu , Meng Wang , Hong Yang","doi":"10.1016/j.giant.2024.100271","DOIUrl":"https://doi.org/10.1016/j.giant.2024.100271","url":null,"abstract":"<div><p>Near-infrared (NIR) light-responsive liquid crystal elastomers (LCEs) doped with organic small-molecule photothermal agents have garnered scientific attention. However, the challenge remains in designing and synthesizing mesogenic photothermal dyes with absorption wavelengths greater than 800 nm. In this research, we design a novel discotic mesogenic NIR absorbing dye, namely the nickel bis(dithiolene) complex YHD868, and prepare NIR-responsive LCE/YHD868 composite films. The discotic mesogenic molecule YHD868 possesses a columnar hexagonal mesophase and exhibits intense NIR absorption at 868 nm, with a photothermal conversion efficiency of about 27 % and a molar extinction coefficient of approximately 30000 M<sup>−1</sup>·cm<sup>−1</sup>. Due to the strong NIR absorption of YHD868, combined with its excellent photothermal stability, the LCE/YHD868 composite films exhibit remarkable photoresponse and mechanical properties. Even at a low doping concentration of 0.2 wt%, the composite film can achieve a tensile strength of 9.8 MPa and an elongation at break of 165 %. Under 880 nm NIR irradiation (3.3 W·cm<sup>−2</sup>), the film can complete reversible photo-induced shrinking deformation in just 2 s, with a shrinkage ratio of about 64 %. This work offers a new approach for the development of photo-responsive smart soft materials.</p></div>","PeriodicalId":34151,"journal":{"name":"GIANT","volume":"18 ","pages":"Article 100271"},"PeriodicalIF":7.0,"publicationDate":"2024-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666542524000365/pdfft?md5=328436d827e188b32fad7e281360e927&pid=1-s2.0-S2666542524000365-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140822482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multifunctional ultraflexible neural probe for wireless optogenetics and electrophysiology 用于无线光遗传学和电生理学的多功能超灵活神经探针

IF 7 1区化学

GIANT Pub Date : 2024-04-26 DOI: 10.1016/j.giant.2024.100272

Suhao Wang , Lixuan Li , Shun Zhang , Qianqian Jiang , Pengxian Li , Chengjun Wang , Rui Xiao , Xiao-Ming Li , Jizhou Song

{"title":"Multifunctional ultraflexible neural probe for wireless optogenetics and electrophysiology","authors":"Suhao Wang , Lixuan Li , Shun Zhang , Qianqian Jiang , Pengxian Li , Chengjun Wang , Rui Xiao , Xiao-Ming Li , Jizhou Song","doi":"10.1016/j.giant.2024.100272","DOIUrl":"https://doi.org/10.1016/j.giant.2024.100272","url":null,"abstract":"<div><p>Electrophysiology and optogenetics are pivotal in neuroscience for probing and modulating neural activities, playing a vital role in unraveling the complexities of brain functionality. Despite their importance, the efficacy of existing devices is hampered by insufficient functional integration, pronounced foreign body reactions, and physical constraints that impede natural animal behaviors. Here, we develop a multifunctional, ultraflexible neural probe designed for simultaneous electrophysiological monitoring and optical neural modulation, along with mechanical properties that are conducive to flexibility and compliance. By integrating a wireless neural signal acquisition and stimulation circuit, we achieved wireless recording of brain signals in mice and wireless optogenetic control over their locomotor behavior. The multifunctional ultraflexible probe presented in this study holds substantial promise for closed-loop brain-machine interfaces and deepening our understanding of neural circuit functions. This innovative approach addresses the aforementioned limitations by a comprehensive solution for in vivo neural interrogation and manipulation, marking a significant advancement in the tools available for neuroscience research.</p></div>","PeriodicalId":34151,"journal":{"name":"GIANT","volume":"18 ","pages":"Article 100272"},"PeriodicalIF":7.0,"publicationDate":"2024-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666542524000377/pdfft?md5=216656efa355addaa3e660f0f50af8f6&pid=1-s2.0-S2666542524000377-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140823968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

GIANT最新文献