The construction of high-strength hydrogels is essential for engineering applications but is often limited by poor durability under stress. Current post-treatment methods are inefficient and time consuming. Inspired by muscle building, we propose a green, efficient, and synergistic enhancement method. The dynamic stretching of the PVA hydrogel in LS solution promotes the formation of an ordered polymer network, while LS can fix the ordered structure. After 500 stretching cycles (approximately 16.7 min), the tensile strength, toughness, and Young’s modulus increase by 76-fold, 117-fold, and 304-fold, respectively, outperforming single treatments such as soaking or training. Multitechnique analyses reveal that nanoscale crystalline domains and microscale-ordered polymers drive these macroscopic improvements. Notably, the LS solution can be substituted with other solvents to achieve similar effects, demonstrating excellent adaptability, scalability, and efficiency. This rapid and straightforward synergistic enhancement technology holds great promise for overcoming the challenges of constructing and applying high-strength hydrogels.
{"title":"Accelerated Hydrogel Strengthening: Synergy between Mechanical Training and Lignin Intake","authors":"Xiaofeng Pan, Xiang Li, Rui Wang, Zhongkai Wang, Yonghao Ni, Qinhua Wang","doi":"10.1021/acs.nanolett.5c00272","DOIUrl":"https://doi.org/10.1021/acs.nanolett.5c00272","url":null,"abstract":"The construction of high-strength hydrogels is essential for engineering applications but is often limited by poor durability under stress. Current post-treatment methods are inefficient and time consuming. Inspired by muscle building, we propose a green, efficient, and synergistic enhancement method. The dynamic stretching of the PVA hydrogel in LS solution promotes the formation of an ordered polymer network, while LS can fix the ordered structure. After 500 stretching cycles (approximately 16.7 min), the tensile strength, toughness, and Young’s modulus increase by 76-fold, 117-fold, and 304-fold, respectively, outperforming single treatments such as soaking or training. Multitechnique analyses reveal that nanoscale crystalline domains and microscale-ordered polymers drive these macroscopic improvements. Notably, the LS solution can be substituted with other solvents to achieve similar effects, demonstrating excellent adaptability, scalability, and efficiency. This rapid and straightforward synergistic enhancement technology holds great promise for overcoming the challenges of constructing and applying high-strength hydrogels.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"17 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143575516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-08DOI: 10.1021/acs.nanolett.5c00751
Yangrui Liu, Jianxiong Zhang, Ying Liu, Jiadong Dan, Luyang Wang, Wei Liu, Lei Zhang, Fengshan Zheng, Haifeng Du, Binghui Ge, Jin-Zhu Zhao, Dongsheng Song
The intercalation of magnetic atoms into van der Waals (vdW) gaps offers a unique opportunity to manipulate the Dzyaloshinskii–Moriya interaction (DMI) and magnetic structures by modifying the local atomic structures in vdW magnets. Herein, a new strategy is proposed for modifying DMI by disrupting the atomic-scale order within the Cr sublattice of Cr-intercalated 2H-TaS2, i.e., Cr1/3TaS2, which enables significant and efficient DMI modulation across a wide range by controlling the degree of atomic disorder. Lorentz transmission electron microscopy reveals pronounced variations in spin-helix periods, which are correlated with changes in the degree of Cr ordering within the vdW gaps, as shown by atomic-resolution imaging and principal component analysis. First-principles calculations confirm that this structural ordering affects the DMI strength, thereby notably altering the spin textures and magnetic transition behaviors. These findings are further supported by macroscopic magnetic measurements and micromagnetic simulations, highlighting new pathways for controlling magnetic properties of vdW materials.
{"title":"Modifying the Dzyaloshinskii–Moriya Interaction via Disruption of Ordered Intercalation in a van der Waals Magnet","authors":"Yangrui Liu, Jianxiong Zhang, Ying Liu, Jiadong Dan, Luyang Wang, Wei Liu, Lei Zhang, Fengshan Zheng, Haifeng Du, Binghui Ge, Jin-Zhu Zhao, Dongsheng Song","doi":"10.1021/acs.nanolett.5c00751","DOIUrl":"https://doi.org/10.1021/acs.nanolett.5c00751","url":null,"abstract":"The intercalation of magnetic atoms into van der Waals (vdW) gaps offers a unique opportunity to manipulate the Dzyaloshinskii–Moriya interaction (DMI) and magnetic structures by modifying the local atomic structures in vdW magnets. Herein, a new strategy is proposed for modifying DMI by disrupting the atomic-scale order within the Cr sublattice of Cr-intercalated 2H-TaS<sub>2</sub>, i.e., Cr<sub>1/3</sub>TaS<sub>2</sub>, which enables significant and efficient DMI modulation across a wide range by controlling the degree of atomic disorder. Lorentz transmission electron microscopy reveals pronounced variations in spin-helix periods, which are correlated with changes in the degree of Cr ordering within the vdW gaps, as shown by atomic-resolution imaging and principal component analysis. First-principles calculations confirm that this structural ordering affects the DMI strength, thereby notably altering the spin textures and magnetic transition behaviors. These findings are further supported by macroscopic magnetic measurements and micromagnetic simulations, highlighting new pathways for controlling magnetic properties of vdW materials.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"212 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143575518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-07DOI: 10.1021/acs.nanolett.5c00285
Yue Liu, Fei Li, Yan Lyu, Fengshuo Wang, Leo Tsz On Lee, Shasha He, Zhong Guo, Jingchao Li
Clustered regularly interspaced short palindromic repeat (CRISPR) gene editing has poor efficacy and off-target side effect concerns. We herein report a semiconducting polymer (SP)-based nanoCRISPR system to improve CRISPR delivery efficacy and allow for near-infrared (NIR) photoactivatable gene editing for cancer therapy. An amphiphilic SP acts as a photothermal converter, and its backbone is grafted with single-stranded deoxyribonucleic acid (DNA), which enables hybridization with single guide ribonucleic acid (sgRNA) via complementary base pairing to form sgRNA/SP-DNA. This sgRNA/SP-DNA nanosystem (nanoCRISPR) can effectively deliver sgRNA into cells and generate heat under NIR laser irradiation via the photothermal effect. The localized heat triggers the dissociation of single-stranded DNA and sgRNA to control the release of sgRNA, thereby achieving precise regulation of CRISPR activity. This NIR photoactivatable gene editing technology is able to precisely regulate the expression of green fluorescent protein (GFP) and polo-like kinase 1 (PLK1) gene for precision gene therapy.
{"title":"A Semiconducting Polymer NanoCRISPR for Near-Infrared Photoactivatable Gene Editing and Cancer Gene Therapy","authors":"Yue Liu, Fei Li, Yan Lyu, Fengshuo Wang, Leo Tsz On Lee, Shasha He, Zhong Guo, Jingchao Li","doi":"10.1021/acs.nanolett.5c00285","DOIUrl":"https://doi.org/10.1021/acs.nanolett.5c00285","url":null,"abstract":"Clustered regularly interspaced short palindromic repeat (CRISPR) gene editing has poor efficacy and off-target side effect concerns. We herein report a semiconducting polymer (SP)-based nanoCRISPR system to improve CRISPR delivery efficacy and allow for near-infrared (NIR) photoactivatable gene editing for cancer therapy. An amphiphilic SP acts as a photothermal converter, and its backbone is grafted with single-stranded deoxyribonucleic acid (DNA), which enables hybridization with single guide ribonucleic acid (sgRNA) via complementary base pairing to form sgRNA/SP-DNA. This sgRNA/SP-DNA nanosystem (nanoCRISPR) can effectively deliver sgRNA into cells and generate heat under NIR laser irradiation via the photothermal effect. The localized heat triggers the dissociation of single-stranded DNA and sgRNA to control the release of sgRNA, thereby achieving precise regulation of CRISPR activity. This NIR photoactivatable gene editing technology is able to precisely regulate the expression of green fluorescent protein (GFP) and polo-like kinase 1 (PLK1) gene for precision gene therapy.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"132 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143575517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-07DOI: 10.1021/acs.nanolett.4c05199
Zheng Zhang, Xiaoxi Liu, Baoyong Sha, Yu Zhang, Lingzhu Zhao, Guoqing Zhao, Jinteng Feng, Ying Zhang, Jin Yang, Zheng Wang, Feng Xu, Tian Jian Lu, Min Lin
Cells sense and respond to the matrix by exerting traction force through binding of integrins to an integrin-specific ligand. Here, Arg−Gly−Asp (RGD) peptide is covalently conjugated to the double-stranded DNA (dsDNA) and stem-loop DNA (slDNA) tethers with a tension tolerance of 43pN and immobilized on a PEG substrate. Unlike dsDNA, which is ruptured under high tension, leading to the removal of RGD, slDNA remains bound even when ruptured. Our results suggest that cells adapt their adhesion state by modulating actin filament polymerization and cofilin phosphorylation, effectively balancing the talin conformation to prevent dsDNA rupture and maintain normal adhesion. This phenomenon, termed integrin–ligand coupling strength, mediated cellular adaptive mechanosensing. Furthermore, we demonstrate that positive durotaxis can shift to negative durotaxis, depending on the integrin–ligand coupling strength. This study highlights the significance of the coupling strength in cell–extracellular matrix (ECM) interactions and offers new insights into designing biomaterials with tunable adhesive properties for cell-based applications.
{"title":"Tunable Integrin–Ligand Coupling Strength Modulates Cellular Adaptive Mechanosensing","authors":"Zheng Zhang, Xiaoxi Liu, Baoyong Sha, Yu Zhang, Lingzhu Zhao, Guoqing Zhao, Jinteng Feng, Ying Zhang, Jin Yang, Zheng Wang, Feng Xu, Tian Jian Lu, Min Lin","doi":"10.1021/acs.nanolett.4c05199","DOIUrl":"https://doi.org/10.1021/acs.nanolett.4c05199","url":null,"abstract":"Cells sense and respond to the matrix by exerting traction force through binding of integrins to an integrin-specific ligand. Here, Arg−Gly−Asp (RGD) peptide is covalently conjugated to the double-stranded DNA (dsDNA) and stem-loop DNA (slDNA) tethers with a tension tolerance of 43pN and immobilized on a PEG substrate. Unlike dsDNA, which is ruptured under high tension, leading to the removal of RGD, slDNA remains bound even when ruptured. Our results suggest that cells adapt their adhesion state by modulating actin filament polymerization and cofilin phosphorylation, effectively balancing the talin conformation to prevent dsDNA rupture and maintain normal adhesion. This phenomenon, termed integrin–ligand coupling strength, mediated cellular adaptive mechanosensing. Furthermore, we demonstrate that positive durotaxis can shift to negative durotaxis, depending on the integrin–ligand coupling strength. This study highlights the significance of the coupling strength in cell–extracellular matrix (ECM) interactions and offers new insights into designing biomaterials with tunable adhesive properties for cell-based applications.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"57 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143570136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The anomalous Hall effect (AHE) is a transport phenomenon typically observed in ferromagnetic materials with broken time-reversal symmetry . Recently, the AHE has been observed in several archetype antiferromagnets (AFMs), including altermagnets, and AFMs with noncollinear, noncoplanar or canted Néel order, due to the breaking of joint symmetry of sublattice-transposing and time-reversal operation. However, the AHE is generally not allowed in collinear AFMs due to symmetry constraints. Here, we report the observation of the AHE in a collinear AFM L10-IrMn (001) film. Scanning transmission electron microscopy investigation shows the presence of (200)-oriented grains in the L10-IrMn (001)-oriented film due to the large lattice mismatch between the films and substrate. Consequently, the joint symmetry, with being the translation operation, may be locally broken in our samples, thus enabling the AHE, which is further supported by ab initio calculations. Our work provides a novel way to generate the AHE in AFMs by engineering the local symmetry.
{"title":"Observation of Anomalous Hall Effect in Collinear Antiferromagnet IrMn","authors":"Daoqian Zhu, Jiaqi Lu, Yuhao Jiang, Zhenyi Zheng, Di Wang, Chenghang Zhou, Jing Zhou, Shaohai Chen, Youdi Gu, Liang Liu, Ping Yang, Kewen Shi, Shouzhong Peng, Guozhong Xing, Weisheng Zhao, Jingsheng Chen","doi":"10.1021/acs.nanolett.4c06271","DOIUrl":"https://doi.org/10.1021/acs.nanolett.4c06271","url":null,"abstract":"The anomalous Hall effect (AHE) is a transport phenomenon typically observed in ferromagnetic materials with broken time-reversal symmetry <i></i><math display=\"inline\"><mi mathvariant=\"script\">T</mi></math>. Recently, the AHE has been observed in several archetype antiferromagnets (AFMs), including altermagnets, and AFMs with noncollinear, noncoplanar or canted Néel order, due to the breaking of joint symmetry of sublattice-transposing and time-reversal operation. However, the AHE is generally not allowed in collinear AFMs due to symmetry constraints. Here, we report the observation of the AHE in a collinear AFM L1<sub>0</sub>-IrMn (001) film. Scanning transmission electron microscopy investigation shows the presence of (200)-oriented grains in the L1<sub>0</sub>-IrMn (001)-oriented film due to the large lattice mismatch between the films and substrate. Consequently, the <i></i><math display=\"inline\"><msub><mrow><mi>t</mi></mrow><mrow><mrow><mn>1</mn></mrow><mo>/</mo><mrow><mn>2</mn></mrow></mrow></msub><mi mathvariant=\"script\">T</mi></math> joint symmetry, with <i></i><math display=\"inline\"><msub><mrow><mi>t</mi></mrow><mrow><mrow><mn>1</mn></mrow><mo>/</mo><mrow><mn>2</mn></mrow></mrow></msub></math> being the translation operation, may be locally broken in our samples, thus enabling the AHE, which is further supported by ab initio calculations. Our work provides a novel way to generate the AHE in AFMs by engineering the local symmetry.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"39 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143570135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-07DOI: 10.1021/acs.nanolett.5c00064
Penghui Zhu, Andrea Vo, Xia Sun, Hannah Kho, Yeling Zhu, Hao Sun, Pu Yang, Zhengyang Yu, Jiaying Zhu, Feng Jiang
Biodegradable cellulose films are promising alternatives to plastics, but achieving stretchable all-cellulose composites (ACCs) remains challenging. Here, we present a scalable strategy for creating stretchable yet mechanically strong ACCs. This approach integrates swollen-regenerated microfibers with dissolution-regenerated cellulose to form multiscale architectures, achieved through mechanical pretreatments and cold NaOH treatment of kraft pulp, followed by vacuum filtration and press-drying. Swollen-regenerated microfibers establish preferential sacrificial networks that enhance mechanical strength through nanofiber pull-out, while dissolution-regenerated cellulose matrix facilitates nanoscale load transfer, maintaining ductility. The ACC achieves a tensile strength of 89.0 MPa, a strain to failure of 24.7%, and a work of fracture of 17.3 MJ m–3─1.3 times stronger, 1.5 times more stretchable, and 3.8 times tougher than microfibrillated cellulose films. With added benefits of wet strength, grease resistance, oxygen barrier property, and biodegradability, this work demonstrates a scalable approach to engineering multiscale cellulose networks for sustainable packaging.
{"title":"Cold Alkali Treatment Enabled Stretchable yet Mechanically Strong All-Cellulose Composite","authors":"Penghui Zhu, Andrea Vo, Xia Sun, Hannah Kho, Yeling Zhu, Hao Sun, Pu Yang, Zhengyang Yu, Jiaying Zhu, Feng Jiang","doi":"10.1021/acs.nanolett.5c00064","DOIUrl":"https://doi.org/10.1021/acs.nanolett.5c00064","url":null,"abstract":"Biodegradable cellulose films are promising alternatives to plastics, but achieving stretchable all-cellulose composites (ACCs) remains challenging. Here, we present a scalable strategy for creating stretchable yet mechanically strong ACCs. This approach integrates swollen-regenerated microfibers with dissolution-regenerated cellulose to form multiscale architectures, achieved through mechanical pretreatments and cold NaOH treatment of kraft pulp, followed by vacuum filtration and press-drying. Swollen-regenerated microfibers establish preferential sacrificial networks that enhance mechanical strength through nanofiber pull-out, while dissolution-regenerated cellulose matrix facilitates nanoscale load transfer, maintaining ductility. The ACC achieves a tensile strength of 89.0 MPa, a strain to failure of 24.7%, and a work of fracture of 17.3 MJ m<sup>–3</sup>─1.3 times stronger, 1.5 times more stretchable, and 3.8 times tougher than microfibrillated cellulose films. With added benefits of wet strength, grease resistance, oxygen barrier property, and biodegradability, this work demonstrates a scalable approach to engineering multiscale cellulose networks for sustainable packaging.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"20 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143570140","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-07DOI: 10.1021/acs.nanolett.5c00539
Wenxuan Wei, Yijing Du, Xiaomei Kang, Yilin Liu, Yujia Liu, Qian Guo, Qun He, Jun Wang, Shoujun Zhu, Jin Yuan Zhou, Weifeng Bu
Although luminescent metal–organic frameworks (MOFs) have been widely reported, rare examples were found to emit in the second near-infrared (NIR-II, 1000–1700 nm) window. In this work, two nanoscale rhodium(I)-based MOFs (Rh-1@SDS and Rh-1@DSPE-PEG) have been controllably constructed in the aqueous dispersions of sodium dodecyl sulfate (SDS) and 1,2-distearoyl-sn-glycero-3-phosphoethanolamine-N-methoxy-poly(ethylene glycol) (DSPE-PEG), wherein micelle- and vesicle-like aggregates form, respectively, with high colloidal stability. The vesicular dispersion of Rh-1@DSPE-PEG exhibits intense NIR-II luminescence at 1125 (1245, shoulder) nm. Consequently, this nanoMOF was used as an NIR-II luminescence probe, indicative of high-resolution systemic and local vascular imaging, where the postoperative recovery process of flap transplantation was clearly visualized. Meanwhile, it also demonstrates superior tumor targeting in the NIR-II window. To the best of our knowledge, this research represents the first example of nanoMOFs having intense NIR-II luminescence and excellent imaging capabilities.
{"title":"Nanoscale Rhodium(I) Based Metal–Organic Framework Demonstrating Intense NIR-II Luminescence for Bioimaging","authors":"Wenxuan Wei, Yijing Du, Xiaomei Kang, Yilin Liu, Yujia Liu, Qian Guo, Qun He, Jun Wang, Shoujun Zhu, Jin Yuan Zhou, Weifeng Bu","doi":"10.1021/acs.nanolett.5c00539","DOIUrl":"https://doi.org/10.1021/acs.nanolett.5c00539","url":null,"abstract":"Although luminescent metal–organic frameworks (MOFs) have been widely reported, rare examples were found to emit in the second near-infrared (NIR-II, 1000–1700 nm) window. In this work, two nanoscale rhodium(I)-based MOFs (<b>Rh-1@SDS</b> and <b>Rh-1@DSPE-PEG</b>) have been controllably constructed in the aqueous dispersions of sodium dodecyl sulfate (SDS) and 1,2-distearoyl-<i>sn</i>-glycero-3-phosphoethanolamine-<i>N</i>-methoxy-poly(ethylene glycol) (DSPE-PEG), wherein micelle- and vesicle-like aggregates form, respectively, with high colloidal stability. The vesicular dispersion of <b>Rh-1@DSPE-PEG</b> exhibits intense NIR-II luminescence at 1125 (1245, shoulder) nm. Consequently, this nanoMOF was used as an NIR-II luminescence probe, indicative of high-resolution systemic and local vascular imaging, where the postoperative recovery process of flap transplantation was clearly visualized. Meanwhile, it also demonstrates superior tumor targeting in the NIR-II window. To the best of our knowledge, this research represents the first example of nanoMOFs having intense NIR-II luminescence and excellent imaging capabilities.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"49 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143570141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Daytime radiative cooling dissipates heat from surfaces by reflecting sunlight and emitting infrared radiation to outer space, featuring zero-energy consumption. Wood-based coolers have received more attention due to their high infrared emissivity, sustainability, and low cost. However, they often degrade under ultraviolet (UV) radiation exposure, resulting in a poor cooling efficiency. Herein, inspired by the structure–functionality relationship in Saharan silver ants, an outdoor durable cooling wood (DCW) is developed that achieves excellent comprehensive performance via the assembly of the photonic structure of Mica@TiO2 on the structure of delignified wood, including both high solar reflectance (0.958), infrared emittance (0.95), mechanical strength (47 MPa), and UV resistance. The unique structure can prevent breaking of the C–O–C skeleton of wood under direct sunlight; the daytime cooling efficiency of DCW can maintain 4.5 °C after 720 h of UV exposure. This work paves the way for the development of durable daytime radiative cooling materials for energy savings.
{"title":"Bioinspired Durable Daytime Radiative Cooling Wood: Realizing Outdoor Longtime Use","authors":"Chenyang Cai, Xin Zhao, Chao Miao, Xinyi Tian, Feiyang Xie, Faming Luo, Meng Zhang, Xiaodan Wu, Jing Liu, Bowen Jiang, Yu Fu","doi":"10.1021/acs.nanolett.4c06496","DOIUrl":"https://doi.org/10.1021/acs.nanolett.4c06496","url":null,"abstract":"Daytime radiative cooling dissipates heat from surfaces by reflecting sunlight and emitting infrared radiation to outer space, featuring zero-energy consumption. Wood-based coolers have received more attention due to their high infrared emissivity, sustainability, and low cost. However, they often degrade under ultraviolet (UV) radiation exposure, resulting in a poor cooling efficiency. Herein, inspired by the structure–functionality relationship in Saharan silver ants, an outdoor durable cooling wood (DCW) is developed that achieves excellent comprehensive performance via the assembly of the photonic structure of Mica@TiO<sub>2</sub> on the structure of delignified wood, including both high solar reflectance (0.958), infrared emittance (0.95), mechanical strength (47 MPa), and UV resistance. The unique structure can prevent breaking of the C–O–C skeleton of wood under direct sunlight; the daytime cooling efficiency of DCW can maintain 4.5 °C after 720 h of UV exposure. This work paves the way for the development of durable daytime radiative cooling materials for energy savings.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"38 5 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143570137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-07DOI: 10.1021/acs.nanolett.4c06408
Xia Chen, Xi Zhang, Wenjie He, Yu Li, Jiating Lu, Dinghua Yang, Deren Li, Li Lei, Yong Peng, Gang Xiang
Despite the tremendous progress in spintronic studies of the van der Waals (vdW) room-temperature ferromagnet Fe3GaTe2, much less effort has been spent on studying its lattice dynamics and possible interaction with spintronic degrees of freedom. In this work, by combining Raman spectroscopy in a wide range of pressures (atmospheric pressure ∼19.5 GPa) and temperature (80–690 K) with first-principles calculations, we systematically studied the lattice dynamics and phonon dispersion of Fe3GaTe2. Our results show that the phonon energies of Fe3GaTe2 located at 126.0 and 143.5 cm–1 originate from the anharmonic E2g2 and harmonic A1g1 vibration modes, respectively. Furthermore, the first room-temperature spin-phonon coupling in the vdW ferromagnet is observed with a strength of ∼0.81 cm–1 at 300 K, by identifying Raman anomalies in both phonon energy and full width at half-maximum of E2g2 below the Curie temperature of Fe3GaTe2. Our findings are valuable for fundamental and applied studies of vdW materials under variable conditions.
{"title":"Lattice Dynamics and Phonon Dispersion of the van der Waals Layered Ferromagnet Fe3GaTe2","authors":"Xia Chen, Xi Zhang, Wenjie He, Yu Li, Jiating Lu, Dinghua Yang, Deren Li, Li Lei, Yong Peng, Gang Xiang","doi":"10.1021/acs.nanolett.4c06408","DOIUrl":"https://doi.org/10.1021/acs.nanolett.4c06408","url":null,"abstract":"Despite the tremendous progress in spintronic studies of the van der Waals (vdW) room-temperature ferromagnet Fe<sub>3</sub>GaTe<sub>2</sub>, much less effort has been spent on studying its lattice dynamics and possible interaction with spintronic degrees of freedom. In this work, by combining Raman spectroscopy in a wide range of pressures (atmospheric pressure ∼19.5 GPa) and temperature (80–690 K) with first-principles calculations, we systematically studied the lattice dynamics and phonon dispersion of Fe<sub>3</sub>GaTe<sub>2</sub>. Our results show that the phonon energies of Fe<sub>3</sub>GaTe<sub>2</sub> located at 126.0 and 143.5 cm<sup>–1</sup> originate from the anharmonic <i>E</i><sub>2<i>g</i></sub><sup>2</sup> and harmonic <i>A</i><sub>1<i>g</i></sub><sup>1</sup> vibration modes, respectively. Furthermore, the first room-temperature spin-phonon coupling in the vdW ferromagnet is observed with a strength of ∼0.81 cm<sup>–1</sup> at 300 K, by identifying Raman anomalies in both phonon energy and full width at half-maximum of <i>E</i><sub>2<i>g</i></sub><sup>2</sup> below the Curie temperature of Fe<sub>3</sub>GaTe<sub>2</sub>. Our findings are valuable for fundamental and applied studies of vdW materials under variable conditions.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"8 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143570139","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-07DOI: 10.1021/acs.nanolett.5c01254
Salvatore Di Marco, Jana Aupič, Giovanni Bussi, Alessandra Magistrato
RNA–membrane interactions are starting to emerge as an important organizing force in both natural and synthetic biological systems. Notably, RNA molecules were recently discovered to be present on the extracellular surface of living cells, where they mediate intercellular signaling. Furthermore, RNA–membrane interactions influence the efficacy of lipid-based RNA delivery systems. However, the molecular terms driving RNA localization at the membrane remain poorly understood. In this work, we investigate how RNAs bind and interact with phospholipid membranes via all-atom simulations. We find that among RNA nucleobases guanine exhibits the most favorable membrane binding free energy due to extensive hydrogen bond formation. Additionally, we show that intra-RNA base pairing, present in organized RNA structures, significantly hinders RNA–membrane binding. Elucidating the molecular details of RNA–membrane association will importantly contribute to improving the design of RNA-based drugs as well as lipid-based RNA delivery systems and to parsing out RNA transport and localization mechanisms.
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