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Coal fly ash-ZIF composites for enhanced and stable carbon capture—an in-depth study† 用于增强和稳定碳捕集的粉煤灰-ZIF 复合材料--一项深入研究†。
IF 5.2
Materials Advances Pub Date : 2024-10-08 DOI: 10.1039/D4MA00597J
Ramadurgam Aniruddha, Satyapaul A Singh, Benjaram M Reddy, Akula Venugopal and Inkollu Sreedhar
{"title":"Coal fly ash-ZIF composites for enhanced and stable carbon capture—an in-depth study†","authors":"Ramadurgam Aniruddha, Satyapaul A Singh, Benjaram M Reddy, Akula Venugopal and Inkollu Sreedhar","doi":"10.1039/D4MA00597J","DOIUrl":"https://doi.org/10.1039/D4MA00597J","url":null,"abstract":"<p >Composites possess significant potential to mitigate the shortcomings of their individual components, offering a measure of reinforcement. In this study, composites based on CFA based Na-A and ZIF-8 were synthesized and subjected to CO<small><sub>2</sub></small> adsorption tests. The composites were identified as a class of ZIF-8@Na-A. These composites retained the physical attributes of their parent materials. Notably, the CO<small><sub>2</sub></small> uptake performance of ZIF-8@Na-A (1 : 5) was particularly high, recording values around 3.48 mmol g<small><sup>−1</sup></small> at 298 K and 1 bar. Hierarchical three step process optimization has been done to achieve the highest carbon capture and stability. Different synthesis protocols have been compared too. TGA studies have been used to validate the amine loading on the adsorbent. Among the factors influencing CO<small><sub>2</sub></small> uptake, temperature and pressure emerged as the most influential, while the time of carbonation exhibited minimal impact. Kinetic analysis revealed that the optimized adsorbent adhered to Avrami kinetics, displaying high <em>R</em><small><sup>2</sup></small> values of 0.994. The Sips adsorption model demonstrated the best fit for explaining the adsorption behavior of the adsorbents. The average heat of adsorption for ZIF-8@Na-A was measured at −11 kJ mol<small><sup>−1</sup></small>. During a 50-cycle stability assessment, the adsorbent exhibited robust performance, retaining approximately 92% of its initial CO<small><sub>2</sub></small> uptake. However, a subtle change in appearance was observed in the ZIF-8@Na-A adsorbent, which turned slightly pale yellowish after the completion of 50 cycles.</p>","PeriodicalId":18242,"journal":{"name":"Materials Advances","volume":null,"pages":null},"PeriodicalIF":5.2,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ma/d4ma00597j?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142524281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Enhanced piezo-response of mixed-cation copper perovskites with Cl/Br halide engineering† 利用 Cl/Br 卤化物工程增强混合阳离子铜包荧光体的压电响应†。
IF 5.2
Materials Advances Pub Date : 2024-10-07 DOI: 10.1039/D4MA00970C
Amr Elattar, Christopher Munoz, Libor Kobera, Andrii Mahun, Jiri Brus, Mohammed Jasim Uddin, Yasuhiko Hayashi, Okenwa Okoli and Tarik Dickens
{"title":"Enhanced piezo-response of mixed-cation copper perovskites with Cl/Br halide engineering†","authors":"Amr Elattar, Christopher Munoz, Libor Kobera, Andrii Mahun, Jiri Brus, Mohammed Jasim Uddin, Yasuhiko Hayashi, Okenwa Okoli and Tarik Dickens","doi":"10.1039/D4MA00970C","DOIUrl":"https://doi.org/10.1039/D4MA00970C","url":null,"abstract":"<p >Halide and cation engineering of organic–inorganic hybrid perovskites has shown a great potential for structural modulation of perovskites and enhancing their optoelectronic properties. Here, we studied the impact of Cl/Br halide engineering on the structural and piezoelectric properties of MA/Cs mixed-cation Cu-perovskite crystals. X-ray diffraction, Raman spectroscopy, and <small><sup>133</sup></small>Cs solid-state NMR were utilized to find out the nature of the perovskite crystal structure formation. Three distinct crystal structures were obtained depending on the Cl/Br content. High Cl content resulted in the formation of Br-doped (Cs/MA)CuCl<small><sub>3</sub></small> perovskite with the presence of paramagnetic Cu<small><sup>2+</sup></small> ions. High Br content led to the formation of Cl-doped (MA/Cs)<small><sub>2</sub></small>CuBr<small><sub>4</sub></small> perovskite with the presence of diamagnetic Cu<small><sup>+</sup></small> ions. Equimolar Cl/Br perovskite content gave a novel crystal structure with the formation of well-dispersed diamagnetic domains. Compared to the high Cl/Br containing perovskites, the equimolar Cl/Br perovskite revealed the highest potential for piezoelectric applications with a maximum recordable piezoelectric output voltage of 5.0 V. The results provide an insight into the importance of mixed-halide and mixed-cation engineering for tailoring the perovskite structural properties towards a wide range of efficient optoelectronics.</p>","PeriodicalId":18242,"journal":{"name":"Materials Advances","volume":null,"pages":null},"PeriodicalIF":5.2,"publicationDate":"2024-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ma/d4ma00970c?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142598759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Synthesis of gum tragacanth-starch hydrogels for water purification 合成用于水净化的鱼胶-淀粉水凝胶
IF 5.2
Materials Advances Pub Date : 2024-10-07 DOI: 10.1039/D4MA00536H
Sana Ahmad and Saleha Imran
{"title":"Synthesis of gum tragacanth-starch hydrogels for water purification","authors":"Sana Ahmad and Saleha Imran","doi":"10.1039/D4MA00536H","DOIUrl":"https://doi.org/10.1039/D4MA00536H","url":null,"abstract":"<p >The increasing demand for environmentally friendly materials to address environmental toxicity has prompted a shift towards natural products. This study focuses on the development of biodegradable starch-based (ST) hydrogels modified with gum tragacanth (GT) using polyvinyl alcohol (PVA) as a cross-linker. These hydrogels were utilized as efficient adsorbents for the removal of methylene blue (MB) and congo red (CR) dyes from aqueous solutions. The hydrogels were synthesized <em>via</em> the solution casting method, yielding four variants by adjusting the weights of ST and GT in ratios of ST/GT (2 : 0, 1.5 : 0.5, 1 : 1, and 0.5 : 1.5). Characterization of the hydrogels was performed using FTIR, FESEM, and TGA-DSC. During MB dye adsorption, ST/GT (0.5 : 1.5) exhibited a remarkable removal efficiency of 97.6% within 90 minutes, at pH 10 and an initial dye concentration of 30 ppm. Similarly, for CR dye, the highest removal efficiency of 93.7% was observed with ST/GT (0.5 : 1.5) under optimal conditions of 90 minutes, pH 2, and a dye concentration of 10 ppm. Kinetic studies indicated that the adsorption process followed a pseudo-second order model. Biodegradability tests confirmed the complete breakdown of the hydrogels in soil. This study successfully demonstrates the potential of using plant-based hydrogels for efficient pollutant removal and sustainable water treatment.</p>","PeriodicalId":18242,"journal":{"name":"Materials Advances","volume":null,"pages":null},"PeriodicalIF":5.2,"publicationDate":"2024-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ma/d4ma00536h?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142598720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
DNAsome with self-boosting ROS generation via tumour acidosis for enhanced and targeted chemodynamic cancer therapy† 通过肿瘤酸中毒自我增强 ROS 生成的 DNAsome,用于增强癌症化学动力学靶向治疗†。
IF 5.2
Materials Advances Pub Date : 2024-10-04 DOI: 10.1039/D4MA00822G
Gowtham Raj, Justin Prasad, Tamraparni Ghosh, Vasudev D. S., Athul V. B., Joyraj Kalita, Devu B. Kumar and Reji Varghese
{"title":"DNAsome with self-boosting ROS generation via tumour acidosis for enhanced and targeted chemodynamic cancer therapy†","authors":"Gowtham Raj, Justin Prasad, Tamraparni Ghosh, Vasudev D. S., Athul V. B., Joyraj Kalita, Devu B. Kumar and Reji Varghese","doi":"10.1039/D4MA00822G","DOIUrl":"https://doi.org/10.1039/D4MA00822G","url":null,"abstract":"<p >The anticancer efficacy of chemodynamic therapy (CDT) is significantly reduced owing to the mild acidic nature of the tumour microenvironment (TME). Typically, Fenton catalysts require a strong acidic microenvironment for effective radical generation at the tumour site. Hence the development of new strategies to achieve efficient Fenton reactions by increasing the acidity of the TME is highly demanded for the advancement of CDT-based cancer treatment. Herein, we demonstrate that the loading of the pH-regulator tamoxifen (<strong>TAM</strong>) into a CDT nanoagent (<strong>DNA1some</strong>) could significantly boost the efficiency of CDT action by increasing the acidity at the TME. The integration of nucleolin specific aptamer DNA (<strong>DNA2</strong>) onto the surface of <strong>DNA1some</strong> (<strong>DNA1some/TAM/DNA2</strong>) permitted the targeted internalization of the nanoformulation selectively into cancer cells, and consequently, a very efficient Fenton reaction was demonstrated inside the cancer cells selectively, which reduced the “off-target” toxicity of the nanoformulation to the surrounding normal cells. Enhanced cytotoxicity was observed for the <strong>TAM</strong>-loaded <strong>DNA1some</strong> compared to <strong>DNA1some</strong> and <strong>TAM</strong> alone, which was attributed to the very efficient Fenton reaction by <strong>DNA1some</strong> due to the increase in acidity caused by the release of <strong>TAM</strong>. Hence, the pH-regulator-loaded CDT-active DNAsome can potentially overcome the intrinsically insufficient acidity of the TME for enabling efficient Fenton reactions.</p>","PeriodicalId":18242,"journal":{"name":"Materials Advances","volume":null,"pages":null},"PeriodicalIF":5.2,"publicationDate":"2024-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ma/d4ma00822g?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142524280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Introduction to ‘Conducting ceramic membranes for energy conversion and storage’ 用于能量转换和储存的导电陶瓷膜 "简介
IF 5.2
Materials Advances Pub Date : 2024-10-04 DOI: 10.1039/D4MA90116A
Kyle Brinkman, Fanglin (Frank) Chen, Dong Ding and Xiao-Dong Zhou
{"title":"Introduction to ‘Conducting ceramic membranes for energy conversion and storage’","authors":"Kyle Brinkman, Fanglin (Frank) Chen, Dong Ding and Xiao-Dong Zhou","doi":"10.1039/D4MA90116A","DOIUrl":"https://doi.org/10.1039/D4MA90116A","url":null,"abstract":"<p >A graphical abstract is available for this content</p>","PeriodicalId":18242,"journal":{"name":"Materials Advances","volume":null,"pages":null},"PeriodicalIF":5.2,"publicationDate":"2024-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ma/d4ma90116a?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142430901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Introduction to ‘Multimodal remote actuation and sensing in polymer nanocomposites for advanced applications’ 用于先进应用的聚合物纳米复合材料中的多模式远程致动和传感 "简介
IF 5.2
Materials Advances Pub Date : 2024-10-03 DOI: 10.1039/D4MA90117G
Vinay Deep Punetha, Lorenzo Bardella and Mohammad Luqman
{"title":"Introduction to ‘Multimodal remote actuation and sensing in polymer nanocomposites for advanced applications’","authors":"Vinay Deep Punetha, Lorenzo Bardella and Mohammad Luqman","doi":"10.1039/D4MA90117G","DOIUrl":"https://doi.org/10.1039/D4MA90117G","url":null,"abstract":"<p >A graphical abstract is available for this content</p>","PeriodicalId":18242,"journal":{"name":"Materials Advances","volume":null,"pages":null},"PeriodicalIF":5.2,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ma/d4ma90117g?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142430900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Enhancing thermometric precision: modulating the temperature of maximum sensitivity via erbium dopant addition in Ba2GdV3O11:Tm3+/Yb3+ nano phosphors† 提高测温精度:通过在 Ba2GdV3O11:Tm3+/Yb3+ 纳米荧光粉中添加铒掺杂剂调节最大灵敏度温度†。
IF 5.2
Materials Advances Pub Date : 2024-10-03 DOI: 10.1039/D4MA00699B
Ikhlas Kachou, Kamel Saidi, Christian Hernández-Álvarez, Mohamed Dammak and Inocencio R. Martín
{"title":"Enhancing thermometric precision: modulating the temperature of maximum sensitivity via erbium dopant addition in Ba2GdV3O11:Tm3+/Yb3+ nano phosphors†","authors":"Ikhlas Kachou, Kamel Saidi, Christian Hernández-Álvarez, Mohamed Dammak and Inocencio R. Martín","doi":"10.1039/D4MA00699B","DOIUrl":"https://doi.org/10.1039/D4MA00699B","url":null,"abstract":"<p >Developing luminescence sensors often prioritizes maximizing relative sensitivity to achieve optimal performance. However, a critical parameter often overlooked is the temperature at which maximum sensitivity occurs. In this study, we delve into this crucial aspect by exploring the impact of erbium doping in Tm<small><sup>3+</sup></small>/Yb<small><sup>3+</sup></small> co-doped Ba<small><sub>2</sub></small>GdV<small><sub>3</sub></small>O<small><sub>11</sub></small> nano phosphors. The crystal structure, microscopic morphology, and luminescence mechanism of BGVO:Yb<small><sup>3+</sup></small>/Tm<small><sup>3+</sup></small> and Er<small><sup>3+</sup></small>/Tm<small><sup>3+</sup></small>/Yb<small><sup>3+</sup></small> up conversion nanoparticles, as well as the temperature sensing characteristics are investigated. Under 975 nm laser excitation, the BGVO:Yb<small><sup>3+</sup></small>/Tm<small><sup>3+</sup></small> and BGVO:Er<small><sup>3+</sup></small>/Tm<small><sup>3+</sup></small>/Yb<small><sup>3+</sup></small> nano phosphors exhibited strong blue and green upconversion luminescence, respectively. The luminescence intensity ratio (LIR) approach was used to analyze the temperature-dependent luminescence spectra in the 300–600 K temperature range. The thermometry strategies were based on thermally coupled energy levels (TCLs) and non-thermally coupled energy levels (NTCLs) of Er<small><sup>3+</sup></small> and Tm<small><sup>3+</sup></small> for temperature sensing performance. In the Tm<small><sup>3+</sup></small>/Yb<small><sup>3+</sup></small> codoped samples, the relative sensitivity typically peaks around 350 K, attributed to TCLs (1.7% K<small><sup>−1</sup></small>, 700 nm/800 nm) with generally lower relative sensitivity compared to non-TCLs (5.39% K<small><sup>−1</sup></small>, 700 nm/475 nm). However, non-TCL sensitivities in the 300–600 K range lack a clear maximum. In contrast, Er<small><sup>3+</sup></small>/Tm<small><sup>3+</sup></small>/Yb<small><sup>3+</sup></small> samples exhibit distinct maxima in non-TCL sensitivities within this temperature range (1.91% K<small><sup>−1</sup></small>, 700 nm/550 nm), offering precise temperature determination for specific applications. Our findings underscore the potential of erbium doping to modulate temperature sensitivity peaks, crucial for optimizing performance in tailored luminescence nanosensors and offering fresh concepts for investigating alternative superior optical temperature sensing nano materials.</p>","PeriodicalId":18242,"journal":{"name":"Materials Advances","volume":null,"pages":null},"PeriodicalIF":5.2,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ma/d4ma00699b?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142430929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The effect of low temperature on poly(3-methyl-N-vinylcaprolactam)-b-poly(N-vinylpyrrolidone) diblock copolymer nanovesicles assembled from all-aqueous media† 低温对在全水介质中组装的聚(3-甲基-N-乙烯基己内酰胺)-b-聚(N-乙烯基吡咯烷酮)二嵌段共聚物纳米微粒的影响†。
IF 5.2
Materials Advances Pub Date : 2024-10-03 DOI: 10.1039/D4MA00831F
Veronika Kozlovskaya, Yiming Yang, Shuo Qian and Eugenia Kharlampieva
{"title":"The effect of low temperature on poly(3-methyl-N-vinylcaprolactam)-b-poly(N-vinylpyrrolidone) diblock copolymer nanovesicles assembled from all-aqueous media†","authors":"Veronika Kozlovskaya, Yiming Yang, Shuo Qian and Eugenia Kharlampieva","doi":"10.1039/D4MA00831F","DOIUrl":"https://doi.org/10.1039/D4MA00831F","url":null,"abstract":"<p >Nanosized polymeric vesicles (polymersomes) self-assembled from double hydrophilic copolymers of poly(3-methyl-<em>N</em>-vinylcaprolactam)<small><sub><em>n</em></sub></small>-<em>b</em>-poly(<em>N</em>-vinylpyrrolidone)<small><sub><em>m</em></sub></small> (PMVC<small><sub><em>n</em></sub></small>-<em>b</em>-PVPON<small><sub><em>m</em></sub></small>) using all aqueous media are a promising platform for biomedical applications, because of their superior stability over liposomes <em>in vivo</em> and high loading capacity. Herein, we explored the temperature-sensitive behavior of PMVC<small><sub>58</sub></small>-<em>b</em>-PVPON<small><sub>65</sub></small> vesicles using transmission electron microscopy (TEM), dynamic light scattering (DLS), atomic force microscopy (AFM), and small-angle neutron scattering (SANS) in response to lowering the solution temperature from 37 to 25, 20, 14 and 4 °C. The copolymer vesicles with an average size of 350 nm at 37 °C were assembled from the diblock copolymer dissolved in aqueous solution at 4 °C. We show that while the polymersome's size gradually decreases upon the temperature decrease from 37 to 4 °C, the average shell thickness increases from 17 nm to 25 nm, respectively. SANS study revealed that the PMVC<small><sub>58</sub></small>-<em>b</em>-PVPON<small><sub>65</sub></small> vesicle undergoes a gradual structure evolution from a dense-shell vesicle at 37–25 °C to a highly-hydrated shell vesicle at 20–14 °C to molecular chain aggregates at 4 °C. From SANS contrast matching study, this vesicle behavior is found to be driven by the gradual rehydration of PMVC block at 37–14 °C. The shell hydration at 20–14 °C also correlated with the 4.4-fold decrease in the relative fluorescence intensity from vesicle-encapsulated fluorescent dye, indicating ∼80% of the dye release within 12 hours after the vesicle exposure to 14 °C. No significant (&lt;5%) dye release was observed for the vesicle solutions at 37–20 °C, indicating excellent cargo retention inside the vesicles. Our study provides new fundamental insights on temperature-sensitive polymer vesicles and demonstrates that the copolymer assembly into polymersomes can be achieved by decreasing a copolymer aqueous solution temperature below 14 °C followed by solution exposure to ≥20 °C. This type of all-aqueous assembly, instead of nanoprecipitation from organic solvents or solvent exchange, can be highly desirable for encapsulating a wide range of biological molecules, including proteins, peptides, and nucleic acids, into stable polymer vesicles without a need for organic solvents for dissolution of the copolymers that are amphiphilic at physiologically relevant temperatures of 20–37 °C.</p>","PeriodicalId":18242,"journal":{"name":"Materials Advances","volume":null,"pages":null},"PeriodicalIF":5.2,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ma/d4ma00831f?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142524261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Doping stimulated ferromagnetic ordering and tailoring of the dielectric properties of Ba1−xCexTiO3† 掺杂激发铁磁有序和定制 Ba1-xCexTiO3† 的介电性能
IF 5.2
Materials Advances Pub Date : 2024-10-02 DOI: 10.1039/D4MA00593G
Rahul Sharma, Shreya Sinha, Rahul Singh, Saurabh Pathak, Barsha Borgohain, Noor Jahan and N. S. Negi
{"title":"Doping stimulated ferromagnetic ordering and tailoring of the dielectric properties of Ba1−xCexTiO3†","authors":"Rahul Sharma, Shreya Sinha, Rahul Singh, Saurabh Pathak, Barsha Borgohain, Noor Jahan and N. S. Negi","doi":"10.1039/D4MA00593G","DOIUrl":"https://doi.org/10.1039/D4MA00593G","url":null,"abstract":"<p >The concurrent integration of ferroelectricity and ferromagnetism in BaTiO<small><sub>3</sub></small> (BT) introduces a promising paradigm for multifunctional applications. This study delves into the structural, magnetic, and dielectric characteristics of Ba<small><sub>1−<em>x</em></sub></small>Ce<small><sub><em>x</em></sub></small>TiO<small><sub>3</sub></small> (BCT) ceramics with Ce substitution varying from 0 to 2%. Notably, BT in its pristine state exhibited weak ferromagnetism at a lower applied magnetic field. However, the introduction of Ce<small><sup>3+</sup></small> led to an augmentation in the <em>M</em><small><sub>s</sub></small> values, attributed to the elevated presence of oxygen vacancies. Rietveld analysis of the X-ray diffraction patterns and the Raman spectra of all the samples revealed the unaltered tetragonal structure of BT despite increasing the Ce content to 1.5%. Simultaneously, an increase in the unit cell volume and crystalline size was noted, whereas the tetragonality factor (<em>c</em>/<em>a</em>) diminished with increasing Ce substitution. Field emission scanning electron microscopy (FESEM) analysis highlighted a transition in the average grain size from 738 nm to 899 nm with increasing Ce content. The investigation of dielectric properties showed a proportional reduction in the dielectric constant with increasing Ce concentration. Additionally, dielectric measurements revealed that AC conductivity increased with frequency, and Ce doping further enhanced the conductivity by introducing additional charge carriers. Despite the reduction in the dielectric constant, the minimal dielectric loss made these materials highly suitable for high-frequency applications. This study underscores the significance of Ce incorporation into BT, introducing magnetic behaviour to an otherwise non-magnetic, lead-free BT system. The observed phenomena open avenues for exploring previously limited multiferroic and magnetoelectric properties of BT ceramics, a promising direction in the realm of lead-free ferroelectrics.</p>","PeriodicalId":18242,"journal":{"name":"Materials Advances","volume":null,"pages":null},"PeriodicalIF":5.2,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ma/d4ma00593g?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142524277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Eradication of planktonic bacteria by shape-tailored gold nanoparticle photothermia† 通过形状定制的金纳米粒子光热技术消灭浮游细菌†。
IF 5.2
Materials Advances Pub Date : 2024-10-02 DOI: 10.1039/D4MA00821A
Zhendong Peng, Laurent Royon, Yun Luo, Philippe Decorse, Sarra Gam Derouich, Michaël Bosco, Christine Gravier-Pelletier, Romain Briandet, John S. Lomas, Claire Mangeney and Miryana Hémadi
{"title":"Eradication of planktonic bacteria by shape-tailored gold nanoparticle photothermia†","authors":"Zhendong Peng, Laurent Royon, Yun Luo, Philippe Decorse, Sarra Gam Derouich, Michaël Bosco, Christine Gravier-Pelletier, Romain Briandet, John S. Lomas, Claire Mangeney and Miryana Hémadi","doi":"10.1039/D4MA00821A","DOIUrl":"https://doi.org/10.1039/D4MA00821A","url":null,"abstract":"<p >Bacterial antimicrobial resistance (AMR) has emerged as a global challenge, exacerbated by the formation of biofilms. To address this issue, the bactericidal effect of gold nanoparticle photothermia has been explored. Gold nanoparticles with different morphologies: spherical (AuNSP), rods (AuNRO), stars (AuNST), and flower-shaped (AuNFL) were synthesised and characterised. Scanning and transmission electron microscopy images confirm the morphologies and give dimensions for the different types of nanoparticles in good agreement with those from dynamic light scattering measurements. Their photothermal capacities under irradiation at 808 and 1064 nm were assessed. The specific absorption rates were determined, and light-to-heat conversion efficiencies evaluated in the heating and cooling phases. Phothermally induced localized hyperthermia significantly increased the mortality rate of planktonic <em>Escherichia coli</em> in the stationary phase, approaching 100% for AuNRO, AuNST, and AuNFL, while AuNSP was ineffective. This demonstrates that bactericidal efficacy is highly dependent on nanoparticle morphology. These findings highlight the potential of shape-tailored gold nanoparticles for developing effective antibacterial treatments.</p>","PeriodicalId":18242,"journal":{"name":"Materials Advances","volume":null,"pages":null},"PeriodicalIF":5.2,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ma/d4ma00821a?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142524323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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