The quest for faster and more densely packed microelectronic circuits has necessitated significant advancements in thermal management and encapsulant manufacturing technologies. This pursuit has driven the development of innovative methods to enhance heat flux and thermal transfer in microelectronics packaging. A critical issue is the thermal stress induced by the coefficient of thermal expansion (CTE) mismatch between the chip and the substrate, threatening the chip's mechanical integrity and lifespan. To address this challenge, there is a growing emphasis on using underfills to improve thermal transfer and heat dissipation. The current study focuses on using hexagonal boron nitride (h‐BN) nanofillers for robust thermal support in microelectronics packaging. This study deploys epoxy adhesives to integrate nanofillers, where precise dispersion is crucial for optimizing thermal and mechanical properties. Findings show 1500‐ and 500‐nm h‐BN enhance axial thermal conductivity and diffusivity linearly with filler content, while the 70‐nm h‐BN plateaus at 3% volume. The 70‐nm h‐BN demonstrates superior radial thermal performance.
{"title":"Enhanced Thermal Management in Microelectronics Packaging With 2D h‐BN Nanocomposite Underfills","authors":"S. A. Razgaleh, Shyam Aravamudhan","doi":"10.1002/nano.202400073","DOIUrl":"https://doi.org/10.1002/nano.202400073","url":null,"abstract":"The quest for faster and more densely packed microelectronic circuits has necessitated significant advancements in thermal management and encapsulant manufacturing technologies. This pursuit has driven the development of innovative methods to enhance heat flux and thermal transfer in microelectronics packaging. A critical issue is the thermal stress induced by the coefficient of thermal expansion (CTE) mismatch between the chip and the substrate, threatening the chip's mechanical integrity and lifespan. To address this challenge, there is a growing emphasis on using underfills to improve thermal transfer and heat dissipation. The current study focuses on using hexagonal boron nitride (h‐BN) nanofillers for robust thermal support in microelectronics packaging. This study deploys epoxy adhesives to integrate nanofillers, where precise dispersion is crucial for optimizing thermal and mechanical properties. Findings show 1500‐ and 500‐nm h‐BN enhance axial thermal conductivity and diffusivity linearly with filler content, while the 70‐nm h‐BN plateaus at 3% volume. The 70‐nm h‐BN demonstrates superior radial thermal performance.","PeriodicalId":510500,"journal":{"name":"Nano Select","volume":"6 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141927555","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. I. H. Mondal, Md. Sofiuzzaman, F. Ahmed, Volker Hessel, Mohammad Boshir Ahmed, M. Zargar
Hydrogel‐based stress‐strain sensors have attracted immense attention recently for developing wearable electronic devices and health‐monitoring systems owing to their intrinsic soft characteristics and flexible nature. Developing hydrogel that has high conductivity, better mechanical performance, and elasticity is necessary for better analysis or getting accurate measurement data. Hence, this study focuses on the development of novel conductive hydrogels with enhanced mechanical, swelling, and sensing properties targeting the advancement of stress‐strain sensitive hydrogel sensors. Polyvinyl alcohol (PVA) and citric acid (CA) have been used to prepare esterified PVA/CA hydrogels while using a simple one‐pot method followed by doping with a conductive polymer (polyaniline, PANI). The resultant PVA/CA/PANI hydrogel displayed a high water uptake capacity of ∼4200%, a high mechanical strain of 700%, high puncture resistance, large durability, and a fast response time when applied as soft human‐motion sensors in real‐time measurement of large‐scale and subtle human physiological stress activities (i.e., joint motions in the forefinger, elbow, wrist, and neck). The high strain sensitivity and ultrahigh stretchability of hydrogel sensors allow them to detect small mechanical changes caused by human movement showing their great potential for hydrogel‐based sensor device fabrication.
{"title":"Conductive hydrogel as stress‐strain sensor for human motion monitoring","authors":"M. I. H. Mondal, Md. Sofiuzzaman, F. Ahmed, Volker Hessel, Mohammad Boshir Ahmed, M. Zargar","doi":"10.1002/nano.202400057","DOIUrl":"https://doi.org/10.1002/nano.202400057","url":null,"abstract":"Hydrogel‐based stress‐strain sensors have attracted immense attention recently for developing wearable electronic devices and health‐monitoring systems owing to their intrinsic soft characteristics and flexible nature. Developing hydrogel that has high conductivity, better mechanical performance, and elasticity is necessary for better analysis or getting accurate measurement data. Hence, this study focuses on the development of novel conductive hydrogels with enhanced mechanical, swelling, and sensing properties targeting the advancement of stress‐strain sensitive hydrogel sensors. Polyvinyl alcohol (PVA) and citric acid (CA) have been used to prepare esterified PVA/CA hydrogels while using a simple one‐pot method followed by doping with a conductive polymer (polyaniline, PANI). The resultant PVA/CA/PANI hydrogel displayed a high water uptake capacity of ∼4200%, a high mechanical strain of 700%, high puncture resistance, large durability, and a fast response time when applied as soft human‐motion sensors in real‐time measurement of large‐scale and subtle human physiological stress activities (i.e., joint motions in the forefinger, elbow, wrist, and neck). The high strain sensitivity and ultrahigh stretchability of hydrogel sensors allow them to detect small mechanical changes caused by human movement showing their great potential for hydrogel‐based sensor device fabrication.","PeriodicalId":510500,"journal":{"name":"Nano Select","volume":"42 14","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141804022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Leihao Lu, Xiao Yang, Dulin Wang, Suting Zhong, Ying Zhang, Guanshan Zhou, Chenlin Li, Jie Wang, Mingying Yang
Scaffold and stem cells are the key elements in the procedure of bone repair. Bombyx mori silk fibroin (SF) is the proper material for bone tissue engineering due to its biocompatibility and its easy to obtain nanofiber structure. The suitable cell substrate is also an important factor because different cells have different adaptations to composite. For this case, selecting a scaffold that can promote osteogenic differentiation of various cells is crucial and meaningful. In this work, hydroxyapatite (HA) was deposited precisely onto each silk nanofiber by electrochemical mineralization (EC) to form SF/HA. SF/HA can promote the proliferation and osteogenic differentiation of both human bone marrow mesenchymal‐derived stem cells (hMSCs) and human adipose‐derived mesenchymal stem cells (hAMSCs). It also promot the expression of alkaline phosphatase (ALP) and osteogenic differentiation related genes. Western blot analyses show mitogen‐activated protein kinase (MAPK) signal pathway is regulated by SF/HA. Therefore, the study provides a proper method to obtain a good composite SF/HA and it promotes the osteogenic differentiation of both hMSCs and hAMSCs.
{"title":"Electrochemical Mineralization Regulates Hydroxyapatite Deposition of Silk Fibroin Nanofibers for Promoting Osteogenic Differentiation of Human Mesenchymal Stem Cells","authors":"Leihao Lu, Xiao Yang, Dulin Wang, Suting Zhong, Ying Zhang, Guanshan Zhou, Chenlin Li, Jie Wang, Mingying Yang","doi":"10.1002/nano.202400030","DOIUrl":"https://doi.org/10.1002/nano.202400030","url":null,"abstract":"Scaffold and stem cells are the key elements in the procedure of bone repair. Bombyx mori silk fibroin (SF) is the proper material for bone tissue engineering due to its biocompatibility and its easy to obtain nanofiber structure. The suitable cell substrate is also an important factor because different cells have different adaptations to composite. For this case, selecting a scaffold that can promote osteogenic differentiation of various cells is crucial and meaningful. In this work, hydroxyapatite (HA) was deposited precisely onto each silk nanofiber by electrochemical mineralization (EC) to form SF/HA. SF/HA can promote the proliferation and osteogenic differentiation of both human bone marrow mesenchymal‐derived stem cells (hMSCs) and human adipose‐derived mesenchymal stem cells (hAMSCs). It also promot the expression of alkaline phosphatase (ALP) and osteogenic differentiation related genes. Western blot analyses show mitogen‐activated protein kinase (MAPK) signal pathway is regulated by SF/HA. Therefore, the study provides a proper method to obtain a good composite SF/HA and it promotes the osteogenic differentiation of both hMSCs and hAMSCs.","PeriodicalId":510500,"journal":{"name":"Nano Select","volume":"14 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141813616","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Akram Hosen, Md Nakibul Hasan Nishat, MD. Mohaimin Hossain Soaib, Omar Sharif Sharkar, Md. Sahabuddin, Imdadul Haque Sharif, S. K. Bhajan
CRISPR Cas system is a revolutionary and precise genome editing system that induces bacterial and archaeal adaptive immunity and already has shown several promising applications in the treatment of genetic diseases and detection of nucleic acid targets. It is a complex tool, comprising diverse effector proteins and guide RNA that can be applied to dissociate and modify genes in living organisms along with the in vitro process. The review concentrates on the advances accomplished from some recent years to 2023 for the emergence of predicting actions of Cas protein with the guide RNA (gRNA), playing a key role in genome editing. This review emphasizes the effect of DNA structure and chromosomal protein on Cas 9 binding with a distinct classification of Cas types. The relevance of this review is highlighted by the significance of the rapid development of wide study methods and their potential impacts on the efficiency of the CRISPR Cas system. We have analyzed recent kinds of literature in this work to integrate a deep learning way that contributes over the next time with some important discussion about viral resistance in eukaryotes along with some cancer treatment strategies, and crop improvement by the CRISPR Cas system.
CRISPR Cas 系统是一种革命性的精确基因组编辑系统，可诱导细菌和古细菌的适应性免疫，在治疗遗传疾病和检测核酸靶标方面已显示出多种应用前景。它是一种复杂的工具，由多种效应蛋白和引导 RNA 组成，可用于在体外过程中离解和修改生物体内的基因。这篇综述集中介绍了从近几年到 2023 年在预测 Cas 蛋白与引导 RNA（gRNA）的作用方面取得的进展，Cas 蛋白在基因组编辑中发挥着关键作用。这篇综述强调了 DNA 结构和染色体蛋白对 Cas 9 结合的影响，并对 Cas 类型进行了独特的分类。广泛研究方法的快速发展及其对 CRISPR Cas 系统效率的潜在影响凸显了本综述的意义。在这项工作中，我们分析了最近的各类文献，整合了一种深度学习方法，这种方法有助于在接下来的时间里对真核生物的病毒抗性、一些癌症治疗策略以及通过CRISPR Cas系统改良作物等问题进行一些重要的讨论。
{"title":"A Review: CRISPR Cas System and the Mechanism With an Inhibition of Binding of CRISPR Cas‐9","authors":"Akram Hosen, Md Nakibul Hasan Nishat, MD. Mohaimin Hossain Soaib, Omar Sharif Sharkar, Md. Sahabuddin, Imdadul Haque Sharif, S. K. Bhajan","doi":"10.1002/nano.202400009","DOIUrl":"https://doi.org/10.1002/nano.202400009","url":null,"abstract":"CRISPR Cas system is a revolutionary and precise genome editing system that induces bacterial and archaeal adaptive immunity and already has shown several promising applications in the treatment of genetic diseases and detection of nucleic acid targets. It is a complex tool, comprising diverse effector proteins and guide RNA that can be applied to dissociate and modify genes in living organisms along with the in vitro process. The review concentrates on the advances accomplished from some recent years to 2023 for the emergence of predicting actions of Cas protein with the guide RNA (gRNA), playing a key role in genome editing. This review emphasizes the effect of DNA structure and chromosomal protein on Cas 9 binding with a distinct classification of Cas types. The relevance of this review is highlighted by the significance of the rapid development of wide study methods and their potential impacts on the efficiency of the CRISPR Cas system. We have analyzed recent kinds of literature in this work to integrate a deep learning way that contributes over the next time with some important discussion about viral resistance in eukaryotes along with some cancer treatment strategies, and crop improvement by the CRISPR Cas system.","PeriodicalId":510500,"journal":{"name":"Nano Select","volume":" 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141826204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Dulce Guzmán-Rocha, Benjamin Aranda-Herrera, Laura Susana Acosta Torres, M. C. Arenas-Arrocena, Rene Garcia-Contreras
Nanomaterials have displayed vast potential across a spectrum of biomedical applications, particularly in recent studies aimed at optimizing traditional systems. Metal oxide nanoparticles, like Magnetic nanoparticles (MNPs), offer unique physicochemical properties ideal for biomedical applications, advancing diagnostics, therapies, tissue engineering and imaging technologies in medicine. Their notable features, such as high specific surface area and porous structure, render them versatile for myriad medical and biological uses. When combined with polymers, MNPs have found utility in nano‐scale treatments targeting specific human ailments, encompassing drug delivery, tissue engineering, and wound care. This review focuses on summarizing the utilization of MNPs examining their structural attributes, magnetic properties, biocompatibility, and their role in scaffolding applications. Furthermore, within the dental domain, periodontitis presents substantial challenges, prompting research into regenerative therapies to foster the growth and specialization of key cell types crucial for effective disease management and tissue revitalization.
{"title":"Modified Scaffolds With Magnetic Nanoparticles in Periodontal Tissue Regeneration","authors":"Dulce Guzmán-Rocha, Benjamin Aranda-Herrera, Laura Susana Acosta Torres, M. C. Arenas-Arrocena, Rene Garcia-Contreras","doi":"10.1002/nano.202400077","DOIUrl":"https://doi.org/10.1002/nano.202400077","url":null,"abstract":"Nanomaterials have displayed vast potential across a spectrum of biomedical applications, particularly in recent studies aimed at optimizing traditional systems. Metal oxide nanoparticles, like Magnetic nanoparticles (MNPs), offer unique physicochemical properties ideal for biomedical applications, advancing diagnostics, therapies, tissue engineering and imaging technologies in medicine. Their notable features, such as high specific surface area and porous structure, render them versatile for myriad medical and biological uses. When combined with polymers, MNPs have found utility in nano‐scale treatments targeting specific human ailments, encompassing drug delivery, tissue engineering, and wound care. This review focuses on summarizing the utilization of MNPs examining their structural attributes, magnetic properties, biocompatibility, and their role in scaffolding applications. Furthermore, within the dental domain, periodontitis presents substantial challenges, prompting research into regenerative therapies to foster the growth and specialization of key cell types crucial for effective disease management and tissue revitalization.","PeriodicalId":510500,"journal":{"name":"Nano Select","volume":" 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141826601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zeynep Sevimli-Yurttas, Rosana G. Moreira, E. Castell‐Perez
The applications of nanoscale zeolitic imidazolate frameworks (ZIF‐8) for antimicrobial drug delivery depend on the aqueous suspension stability of the ZIF‐8 which is influenced by their crystallinity, size, shape, aggregation, and surface chemistry. This study evaluated the stability of ZIF‐8 nanoparticles in terms of their aggregation and sedimentation characteristics. ZIF‐8 nanocomposites were synthesized with methanol via sonication at 30°C for 1 h. The effect of drying methods (oven drying at 80°C, and vacuum drying at 35°C), number of washing steps (0 = no wash, 1, 2, 3), and washing medium (washing with water and ethanol instead of methanol, and redispersion in water and ethanol) on the suspension stability was evaluated. The impact of added xanthan gum (XG) and poly‐L‐lysine (PL) as suspension media was also evaluated. ZIF‐8 nanoparticles were also synthesized using ethanol and suspended in PL. % transmittance and zeta potential were measured for freshly prepared ZIF‐8 suspensions in PL and after freeze‐drying and resuspending in water. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), and x‐ray diffraction (XRD) analysis were utilized for the assessment of the crystallinity, structure, and morphology of the samples. Antibacterial activity was evaluated by disc diffusion test against Escherichia coli. Dried methanol‐synthesized ZIF‐8 nanoparticles did not suspend in water; only the ZIF‐8 nanoparticles synthesized with reduced washing times and no drying treatment were resuspended in the water, XG and PL solutions. Instead, the ethanol‐synthesized ZIF‐8 nanoparticles were resuspended in water even after being washed three times and dried in a vacuum oven. SEM and TEM images and XRD patterns showed that alcohol can form well‐defined ZIF‐8 nanoparticles. FTIR spectra showed that ZIF‐8 had typical peaks of ZIF‐8 reported by others. Although particle size increased, the PL coating provided a 32.22% increase in zeta potential of ZIF‐8 nanoparticles from 36.25 to 47.93 mV (p < 0.05) and prevented aggregation and sedimentation of the nanoparticles without changing their morphology. All the tested ZIF‐8 nanoparticles showed antibacterial activity with the PL‐coated ZIF‐8 having the highest effect followed by the ZIF‐8 nanoparticles synthesized in ethanol.
{"title":"Aggregation and Sedimentation Stability of Nanoscale Zeolitic Imidazolate Framework (ZIF‐8) Nanocomposites for Antimicrobial Agent Delivery Applications","authors":"Zeynep Sevimli-Yurttas, Rosana G. Moreira, E. Castell‐Perez","doi":"10.1002/nano.202400029","DOIUrl":"https://doi.org/10.1002/nano.202400029","url":null,"abstract":"The applications of nanoscale zeolitic imidazolate frameworks (ZIF‐8) for antimicrobial drug delivery depend on the aqueous suspension stability of the ZIF‐8 which is influenced by their crystallinity, size, shape, aggregation, and surface chemistry. This study evaluated the stability of ZIF‐8 nanoparticles in terms of their aggregation and sedimentation characteristics. ZIF‐8 nanocomposites were synthesized with methanol via sonication at 30°C for 1 h. The effect of drying methods (oven drying at 80°C, and vacuum drying at 35°C), number of washing steps (0 = no wash, 1, 2, 3), and washing medium (washing with water and ethanol instead of methanol, and redispersion in water and ethanol) on the suspension stability was evaluated. The impact of added xanthan gum (XG) and poly‐L‐lysine (PL) as suspension media was also evaluated. ZIF‐8 nanoparticles were also synthesized using ethanol and suspended in PL. % transmittance and zeta potential were measured for freshly prepared ZIF‐8 suspensions in PL and after freeze‐drying and resuspending in water. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), and x‐ray diffraction (XRD) analysis were utilized for the assessment of the crystallinity, structure, and morphology of the samples. Antibacterial activity was evaluated by disc diffusion test against Escherichia coli. Dried methanol‐synthesized ZIF‐8 nanoparticles did not suspend in water; only the ZIF‐8 nanoparticles synthesized with reduced washing times and no drying treatment were resuspended in the water, XG and PL solutions. Instead, the ethanol‐synthesized ZIF‐8 nanoparticles were resuspended in water even after being washed three times and dried in a vacuum oven. SEM and TEM images and XRD patterns showed that alcohol can form well‐defined ZIF‐8 nanoparticles. FTIR spectra showed that ZIF‐8 had typical peaks of ZIF‐8 reported by others. Although particle size increased, the PL coating provided a 32.22% increase in zeta potential of ZIF‐8 nanoparticles from 36.25 to 47.93 mV (p < 0.05) and prevented aggregation and sedimentation of the nanoparticles without changing their morphology. All the tested ZIF‐8 nanoparticles showed antibacterial activity with the PL‐coated ZIF‐8 having the highest effect followed by the ZIF‐8 nanoparticles synthesized in ethanol.","PeriodicalId":510500,"journal":{"name":"Nano Select","volume":"43 13","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141643456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
UVC‐LEDs have drawn attention recently because of their benefits to sterilization, decontamination, etc. Since the internal quantum efficiency and light extraction efficiency (LEE) of UVC‐LEDs are low, their external quantum efficiency remains unsatisfied. To enhance the LEE, this study proposes an integration design with the features of substrate‐thickness optimization, substrate shaping, diffuse‐reflective coating, an index‐matching layer, and taper‐base optimization. In addition to optical modeling via ray tracing, thermal modeling is conducted to evaluate both the optical and thermal performances of each feature. The simulation results show that, by means of the combination of these features, the LEE of the chip can be raised from 18.5% to more than 40%, and the average temperature of the device can be lowered by 2.2°C via the design of the diffuse‐reflective coating.
{"title":"Structure design for light‐extraction enhancement of UVC‐LED","authors":"Qixin Liu, An‐Chi Wei","doi":"10.1002/nano.202300179","DOIUrl":"https://doi.org/10.1002/nano.202300179","url":null,"abstract":"UVC‐LEDs have drawn attention recently because of their benefits to sterilization, decontamination, etc. Since the internal quantum efficiency and light extraction efficiency (LEE) of UVC‐LEDs are low, their external quantum efficiency remains unsatisfied. To enhance the LEE, this study proposes an integration design with the features of substrate‐thickness optimization, substrate shaping, diffuse‐reflective coating, an index‐matching layer, and taper‐base optimization. In addition to optical modeling via ray tracing, thermal modeling is conducted to evaluate both the optical and thermal performances of each feature. The simulation results show that, by means of the combination of these features, the LEE of the chip can be raised from 18.5% to more than 40%, and the average temperature of the device can be lowered by 2.2°C via the design of the diffuse‐reflective coating.","PeriodicalId":510500,"journal":{"name":"Nano Select","volume":"38 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141652321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This Special Issue is dedicated to current research activities on Advanced Porous Materials within the framework of “The NETPORE COST Action,” providing a collection of 12 outstanding contributions (four review papers and eight original research papers) from diverse research groups on the latest progresses regarding porous nano‐ and micro‐materials for diverse applications. The contributions herein address the impact of porous materials in basic science, batteries, biosensing, and translational and personalized medicine for the treatment of various diseases. Overall, this Special Issue is expected to provide important background and new knowledge on the latest advances in porous materials and their broad applications.
{"title":"Special Issue on Advances in Porous Materials","authors":"Hélder A. Santos","doi":"10.1002/nano.202400088","DOIUrl":"https://doi.org/10.1002/nano.202400088","url":null,"abstract":"This Special Issue is dedicated to current research activities on Advanced Porous Materials within the framework of “The NETPORE COST Action,” providing a collection of 12 outstanding contributions (four review papers and eight original research papers) from diverse research groups on the latest progresses regarding porous nano‐ and micro‐materials for diverse applications. The contributions herein address the impact of porous materials in basic science, batteries, biosensing, and translational and personalized medicine for the treatment of various diseases. Overall, this Special Issue is expected to provide important background and new knowledge on the latest advances in porous materials and their broad applications.","PeriodicalId":510500,"journal":{"name":"Nano Select","volume":"66 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141653440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sharnappa Chapi, G. Babaladimath, M. V. Murugendrappa, A. Raghu
In this work, novel tragacanth gum‐graft‐poly(2‐acrylamido‐2‐methylpropanesulfonic acid) (TG‐g‐PAMPS) hydrogel was synthesized via free radical copolymerization of TG, 2‐acrylamido‐2‐methylpropanesulfonic acid by using ammonium peroxodisulfate and N,N‐methylene‐bis‐acrylamide under microwave radiation, resulting in the cross‐linked graft copolymer network. Silver nanoparticles (SNs) were formed and stabilized by the reduction of silver nitrate using tri‐sodium citrate. The TG‐g‐PAMPS gel and its nanocomposite were characterized and confirmed using FTIR, TGA, XRD, SEM, EDS, and TEM techniques. It is observed that the presence of SNs significantly improves the swelling ability of the TG‐g‐PAMPS gel. Degradation studies of both hydrogels were studied using the soil burial method and determining the respective weight loss. The presence of SNs is found to impart significant antibacterial properties to the gel against Pseudomonas aeruginosa and Escherichia coli bacteria. Further, the TG‐g‐PAMPS gel and TG‐g‐PAMPS‐SN were evaluated as matrix materials for the release of the drug (diclofenac sodium) and the effect of SNs on the release was examined. The in‐vitro released data were analyzed using empirical equations to understand the mechanism of release. Among the various models, the released data were well fitted into the Korsmeyer–Peppas equation and the released kinetics followed non‐Fickian diffusion.
{"title":"Microwave‐Assisted Tragacanth Gum–Based Grafted Silver Nanocomposite Hydrogel for Sustained Release Formulations of Diclofenac Sodium and Antibacterial Assay","authors":"Sharnappa Chapi, G. Babaladimath, M. V. Murugendrappa, A. Raghu","doi":"10.1002/nano.202300200","DOIUrl":"https://doi.org/10.1002/nano.202300200","url":null,"abstract":"In this work, novel tragacanth gum‐graft‐poly(2‐acrylamido‐2‐methylpropanesulfonic acid) (TG‐g‐PAMPS) hydrogel was synthesized via free radical copolymerization of TG, 2‐acrylamido‐2‐methylpropanesulfonic acid by using ammonium peroxodisulfate and N,N‐methylene‐bis‐acrylamide under microwave radiation, resulting in the cross‐linked graft copolymer network. Silver nanoparticles (SNs) were formed and stabilized by the reduction of silver nitrate using tri‐sodium citrate. The TG‐g‐PAMPS gel and its nanocomposite were characterized and confirmed using FTIR, TGA, XRD, SEM, EDS, and TEM techniques. It is observed that the presence of SNs significantly improves the swelling ability of the TG‐g‐PAMPS gel. Degradation studies of both hydrogels were studied using the soil burial method and determining the respective weight loss. The presence of SNs is found to impart significant antibacterial properties to the gel against Pseudomonas aeruginosa and Escherichia coli bacteria. Further, the TG‐g‐PAMPS gel and TG‐g‐PAMPS‐SN were evaluated as matrix materials for the release of the drug (diclofenac sodium) and the effect of SNs on the release was examined. The in‐vitro released data were analyzed using empirical equations to understand the mechanism of release. Among the various models, the released data were well fitted into the Korsmeyer–Peppas equation and the released kinetics followed non‐Fickian diffusion.","PeriodicalId":510500,"journal":{"name":"Nano Select","volume":"55 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141663240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pittosporum resiniferum oil was extracted from the seed and the oil together with methanol was use for the production of biodiesel through transesterification process using novel solid base catalyst (K2CO3 supported on MgO). 0.6:5 (K2CO3 loaded on MgO), a 5 h calcination time, 600°C calcination temperatures were the optimum conditions under which the catalyst was prepared. FTIR, SEM, CO2‐TPD, XRD, N2 adsorption‐desorption, Hammett indicators and other techniques were used to characterize the catalyst. The molar ratio of methanol‐to‐oil, the catalyst amount, time of the reaction as well as the temperature of the reaction were examined. The study found that 16:1 methanol‐to‐oil molar ratio, 5% catalyst loading amount, a reaction time of 2.0 h, and a reaction temperature of 60°C were sufficient for a maximum yield of 97.4%. With relative high activity, the catalyst can perhaps be used again possibly for five times. The characteristics of the biodiesel produced were consistent with international standards.
{"title":"Production of Biodiesel from Crude Pittosporum resiniferum Oil Using Heterogeneous Solid Base Catalyst","authors":"Rogers Kipkoech, Mohammed Takase","doi":"10.1002/nano.202300132","DOIUrl":"https://doi.org/10.1002/nano.202300132","url":null,"abstract":"Pittosporum resiniferum oil was extracted from the seed and the oil together with methanol was use for the production of biodiesel through transesterification process using novel solid base catalyst (K2CO3 supported on MgO). 0.6:5 (K2CO3 loaded on MgO), a 5 h calcination time, 600°C calcination temperatures were the optimum conditions under which the catalyst was prepared. FTIR, SEM, CO2‐TPD, XRD, N2 adsorption‐desorption, Hammett indicators and other techniques were used to characterize the catalyst. The molar ratio of methanol‐to‐oil, the catalyst amount, time of the reaction as well as the temperature of the reaction were examined. The study found that 16:1 methanol‐to‐oil molar ratio, 5% catalyst loading amount, a reaction time of 2.0 h, and a reaction temperature of 60°C were sufficient for a maximum yield of 97.4%. With relative high activity, the catalyst can perhaps be used again possibly for five times. The characteristics of the biodiesel produced were consistent with international standards.","PeriodicalId":510500,"journal":{"name":"Nano Select","volume":"360 14","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141686412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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