共查询到20条相似文献，搜索用时 0 毫秒
1.
Mohammad Mozafari Ahmad Arabi Shamsabadi Ahmad Rahimpour Masoud Soroush 《Advanced Materials Technologies》2021,6(10):2001189
Water pollution is a major global challenge, as conventional polymeric membranes are not adequate for water treatment anymore. Among emerging materials for water treatment, composite membranes are promising, as they have simultaneously improved water permeation and ions rejection. Recently, a new family of 2D materials called MXenes has attracted considerable attention due to their appealing properties and wide applications. MXenes can be incorporated into many polymeric materials due to their high compatibility. MXenes/polymer composite membranes have been found to have appealing electrical, thermal, mechanical, and transport properties, because of strong interactions between polymer chains and surface functional groups of MXenes and the selective nanochannels that are created. This article reviews advances made in the area of ion-selective MXene-based membranes for water purification. It puts the advances into perspective and provides prospects. MXenes’ properties and synthesis methods are briefly described. Strategies for the preparation of MXene-based membranes including mixed-matrix membranes, thin-film nanocomposite membranes, and laminated membranes are reviewed. Recent advances in ion-separation and water-desalination MXene-based membranes are elucidated. The dependence of ion-separation performance of the membranes on fabrication techniques, MXene's interlayer spacing, and MXene's various surface terminations are elucidated. Finally, opportunities and challenges in ion-selective MXene-based membranes are discussed. 相似文献
2.
近年来,抗生素耐药菌在全球范围内得到迅速而广泛地传播,新型抗菌药物的开发刻不容缓。随着生物纳米技术的发展,二维层状纳米材料有望成为处理耐药菌的替代选择。本文综述了石墨烯及其衍生物(GMs)、过渡金属硫化物(TMDs)、层状双氢氧化物(LDHs)及MXenes二维层状纳米材料的结构特征及其抗菌应用的最新报道,讨论了材料的抗菌机制,例如物理/机械损伤、脂质提取、氧化应激和光热/光动力效应等。最后,本文针对二维层状纳米材料的抗菌应用前景进行了展望:(1)材料特有的空间结构及优异的生物相容性决定了其可以作为抗菌药物的理想载体;(2)优异的光动力和光热杀菌效应使它具有治疗局部皮肤感染的强大潜力;(3)拥有光催化抗菌特性的2D材料可制成抗菌涂层,实现简易的原位消毒,有望应用于无菌医疗设备中。 相似文献
3.
为设计一种能够响应pH的、新型多功能创面敷料,使用季铵化壳聚糖(QCS)、接枝了磺胺嘧啶(SD)的氧化葡聚糖(Dex-CHO/SD)和妥布霉素(TOB),通过席夫碱键和氢键反应形成DSTQ水凝胶。对水凝胶的形貌、降解性、抑菌性、细胞相容性、血液相容性等性能进行研究。结果表明：具有三维孔状结构的DSTQ水凝胶可以响应感染造成的pH降低,进而发生降解,释放药物;DSTQ水凝胶对铜绿假单胞菌的抑制率显著高于金黄色葡萄球菌;DSTQ水凝胶毒性低,生物安全性高,与L929细胞共培养3 d后,细胞活力高于95%;DSTQ水凝胶具有良好的血液相容性,溶血率远小于5%;细胞在DSTQ水凝胶表面能够快速迁移,有利于伤口愈合;当DSTQ水凝胶负载生长因子后具有良好的抗炎效果。研究结果表明,DSTQ水凝胶可以作为新型创面敷料,有望应用于临床促伤口愈合。 相似文献
4.
Fangling Li Xiaoman Han Dongdong Cao Junxia Yin Li Chen Dongmei Li Lin Cui Zhiyong Liu Xuhong Guo 《材料科学前沿(英文版)》2023,17(2):230641
Hemostatic dressings with multiple functions are superior to current hemostatic dressings for use in the complex situation of emergency accidents. In particular, the existing dressings lack consideration for the prevention of hypothermic shock after massive hemorrhage. In this study, gelatin (GN) and oxidized pectin (OP) were used for Schiff base cross-linking, and then polyvinyl alcohol (PVA) solution mixed with hemostatic caffeic acid (CA) was introduced to obtain aerogel substrate material (CB) after lyophilization. Polydimethylsiloxane (PDMS) and silver nanowires (Ag NWs) were used to construct a hydrophobic layer, an antibacterial layer and an infrared reflective layer on both sides of CB to prepare a multifunctional aerogel wound dressing with heat preservation, antifouling, hemostasis and antibacterial properties (PDMS-Ag NW-CB). The results showed that the infrared transmittance of PDMS-Ag NW-CB is almost 0, so that thermal energy loss from the body is minimized. The contact angles with water and blood are 129° and 120°, respectively, which have the effect of antifouling. This dressing can absorb blood quickly within 10 min, adhere to and gather platelets, and achieve hemostasis. It has good antibacterial and biocompatibility. Therefore, PDMS-Ag NW-CB has great potential in application to emergency treatment. 相似文献
5.
Severe skin wounds cause great problems and sufferings to patients. In this study, an injectable wound dressing based on strontium ion cross-linked starch hydrogel (SSH) was developed and evaluated. The good inject-ability of SSH made it easy to be delivered onto the wound surface. The good tissue adhesiveness of SSH ensured a firm protection of the wound. Besides, SSH supported the proliferation of NIH/3T3 fibroblasts and facilitated the migration of human umbilical vein endothelial cells (HUVECs). Importantly, SSH exhibited strong antibacterial effects on Staphylococcus aureus (S. aureus), which could prevent wound infection. These results demonstrate that SSH is a promising wound dressing material for promoting wound healing. 相似文献
6.
Chuang XIAO Ge ZHANG Wencheng LIANG Zhaochuang WANG Qiaohui LU Weibin SHI Yan ZHOU Yong GUAN Meidong LANG 《材料科学前沿(英文版)》2022,16(2):220599
Managing wounds is a growing universal problem and developing effective wound dressings to staunch bleeding and protect wounds from bacterial infections is an increasingly serious challenge. In this work, a remolding electrospinning nanofiber three-dimensional structure wound dressing (CCP) was prepared with superhydrophilicity, high water absorption and absorbing capacity, excellent hemostatic capacity and antibacterial ability, and biocompatibility to promote wound healing. Polyhexamethylene guanidine hydrochloride (PHMG) was grafted to cellulose diacetate (CDA) wound dressing surface through an amide reaction. A water contact angle analysis demonstrated that CCP wound dressing could be beneficial to promote wound exudate management effectively with rapid absorption of water within 0.2 s. In vitro hemo- and cytocompatibility assay showed that a CCP wound dressing had no significant hemotoxicity or cytoxicity. Specifically, CCP wound dressings could be beneficial to accelerate wound hemostasis and further reduce mortality caused by uncontrolled bleeding. Furthermore, CCP wound dressings have an excellent antibacterial ability, which could be beneficial to inhibit wound inflammatory over-reaction and promote normal wound healing. Combined together, the prepared wound dressing in this research effort is expected to have high-potential in clinical applications. 相似文献
7.
Dong YAN Zhong-Zheng ZHOU Chang-Qing JIANG Xiao-Jie CHENG Ming KONG Ya LIU Chao FENG Xi-Guang CHEN 《材料科学前沿(英文版)》2016,10(4):358-366
A water absorption biomaterial, sodium carboxymethylation-functionalized chitosan fibers (Na-NOCC fibers) were prepared, applied for cutaneous wound repair, and characterized by FTIR and NMR. The water absorption of Na-NOCC fibers increased significantly with substitution degree rising, from 3.2 to 6.8 g/g, and higher than that of chitosan fibers (2.2 g/g) confirmed by swelling behavior. In the antibacterial action, the high degree of substitution of Na-NOCC fibers exhibited stronger antibacterial activities against E. coli (from 66.54% up to 88.86%). The inhibition of Na-NOCC fibers against S. aureus were above 90%, and more effective than E. coli. The cytotoxicity assay demonstrated that Na-NOCC2 fibers were no obvious cytotoxicity to mouse fibroblasts. Wound healing test and histological examination showed that significantly advanced granulation tissue and capillary formation in the healing-impaired wounds treated with Na-NOCC fibers, as compared to those treated with gauze, which demonstrated that Na- NOCC fibers could promote skin repair and might have great application for wound healing. 相似文献
8.
罗勒精油(Basil essential oil,BEO)是一种绿色、安全的抑菌剂。然而,BEO的强挥发性限制了其在抑菌伤口敷料领域的应用。本文采用纳米沉淀法制备了纳米罗勒精油(BEO@Zein(玉米醇溶蛋白)),然后将其负载在以聚乙烯吡咯烷酮(PVP)和聚乙烯醇(PVA)为基材的水凝胶上,通过冻融循环形成了BEO@Zein/PVP-PVA水凝胶伤口敷料,对BEO@Zein和水凝胶的微观形貌和结构进行表征,对水凝胶的抑菌性能、力学性能、溶胀保湿性、降解性、血液相容性进行研究。结果表明：BEO@Zein形成了以BEO为核、Zein为壳的纳米球形结构(平均粒径为56.3 nm),显著降低了BEO挥发性。BEO@Zein/PVP-PVA水凝胶可以缓慢释放BEO,从而表现出优异的缓释抑菌性能。因此,BEO@Zein/PVP-PVA水凝胶具有良好的抑菌持久性(超过72 h)。此外,水凝胶还表现出显著的抗细菌生物膜性能。BEO@Zein/PVP-PVA水凝胶的力学性能、溶胀保湿性、降解性和血液相容性均表现良好。研究表明：BEO@Zein/PVP-PVA水凝胶是一种良好的伤口敷料材料。 相似文献
9.
《材料科学技术学报》2024,202(35)
MXene-based 2D heterostructures have emerged as a highly promising area of research in the field of energy storage and conversion,owing to their exceptional properties and versatility.This comprehensive review aims to highlight the recent advancements and challenges associated with tailoring MXene-based heterostructures.The review focuses on the progress made in the past decade regarding 2D/2D MXene-based heterostructures for energy storage/conversion.The influence of interfacial interactions,electronic conductivity,ion diffusion pathways,and surface chemistry on the performance of these heterostructures in supercapacitors,batteries,and water-splitting reactions have been critically examined.By considering these factors,researchers gain insights into the design principles and optimization strategies for MXene-based heterostructures.By understanding the progress made and the existing challenges,researchers can further explore the vast potential of MXene heterostructures and contribute to the development of next-generation energy storage and conversion technologies. 相似文献
10.
MXenes作为一种新兴的二维层状过渡金属碳化物、氮化物和碳氮化合物, 近年来被广泛应用于物理、化学、材料科学和纳米技术领域当中。MXenes制备过程中会不可避免地出现缺陷和—O, —OH, —F官能团, 同时具备高的电导率和大的比表面积, 使得MXenes具有良好的电子转移速率, 可作为一种优良的电化学催化剂。本文综述了MXenes在电催化领域的研究进展, 介绍了MXenes多种合成方法、不同掺杂类型的发展现状, 重点讨论了其在电催化产氢、产氧、氧气还原、CO2还原以及氮气还原过程中的应用及机理研究, 并指出目前MXenes制备方法应朝着环境友好、形貌可控、难以氧化和高的可调节性方向发展, 以便应用于不同的电催化反应中。 相似文献
11.
12.
The development and applications of transition metal carbides, nitrides and carbonitrides, commonly denoted as MXenes, have during the last few years rapidly expanded in various technological fields owing to their unique and controllable properties. These materials exhibit competing performance comparing with traditional materials and have created numerous opportunities for technology markets. Taking the advantage of excellent optoelectronic features, MXenes have been utilized for the construction of photodetectors with various structures and unique functionalities. While the application of MXenes in this area can be traced back to 2016, we have during the recent three years witnessed a dramatic development of MXene-based photodetectors, calling for a timely review to guideline their future direction. In this work, synthetic strategies of pristine MXenes are briefly introduced and their properties are discussed focusing on the optoelectronic aspects that are fundamental for the photoelectric conversion. Recent advances of MXene-based photodetectors are comprehensively summarized based on different types of MXenes and innovative designs of device construction. Finally, we provide perspectives for future challenges and opportunities of MXene-based photodetectors, which may enlighten their further development. 相似文献
13.
《Current Opinion in Solid State & Materials Science》2019,23(3):149-163
In 2011, a new family of two dimensional (2D) carbides, carbonitrides and nitrides – labeled MXenes – was discovered. Since then the number of papers on these materials has increased exponentially for several reasons amongst them: their hydrophilic nature, excellent electronic conductivities and ease of synthesizing large quantities in water. This unique combination of properties and ease of processing has positioned them as enabling materials for a large, and quite varied, host of applications from energy storage to electromagnetic shielding, transparent conductive electrodes, electrocatalysis, to name a few. Since the initial synthesis of Ti3C2 in hydrofluoric acid, many more compositions were discovered, and different synthesis pathways were explored. Most of the work done so far has been conducted on top-down synthesis where a layered parent compound is etched and then exfoliated. Three bottom-up synthesis methods, chemical vapor deposition, a template method and plasma enhanced pulsed laser deposition have been reported. The latter methods enable the synthesis of not only high-quality ultrathin 2D transition metal carbide and nitride films, but also those that could not be synthesized by selective etching. This article reviews and summarizes the most important breakthroughs in the synthesis of MXenes and high-quality ultrathin 2D transition metal carbide and nitride films. 相似文献
14.
15.
16.
Ji-Hwan Ha Jae Yun Kim Dahong Kim Junseong Ahn Yongrok Jeong Jiwoo Ko Soonhyoung Hwang Sohee Jeon Young Jung Jimin Gu Hyeonseok Han Jungrak Choi Gihun Lee Moonjeong Bok Su A Park Yee Sook Cho Jun-Ho Jeong Inkyu Park 《Advanced Materials Technologies》2023,8(7):2201765
Considerable efforts have been devoted to developing wound dressings with various functions, including rapid cell proliferation, protection against infection, and wound state monitoring to minimize severe pain and the risks of wound-caused secondary infections. However, it remains challenging to diagnose wound conditions and achieve integration of the above functions without specialized equipment and expertise in wound care. This study describes an electrospun composite micro/nanofiber-based bilayer-dressing patch comprising a healing-support layer (hyaluronic acid, gelatin, and dexpanthenol) and a protective/monitoring layer (curcumin and polycaprolactone). The improved cell regeneration function and biocompatibility of the healing-support layer enable rapid healing, as evidenced by the expedited growth of fibroblasts. The superior antimicrobial properties (against Escherichia coli and Staphylococcus aureus) and visible color changes within the pH range of wound lesions (pH 6–9) of the protective/monitoring layer make the dressing suitable for advanced wound care. The wounds inflicted on BALB/c mice heal rapidly (12 days) without scars while the wound state can be diagnosed by the change in color of the dressing patch. The multifunctional wound dressing patch developed in this study is expected to promote wound healing and monitor wound state; thus, facilitating convenient wound management. 相似文献
17.
MXenes, a bourgeoning class of 2D transition metal carbides, are of considerable interest in catalysis due to their rich surface chemistry, tunable electronic structures, and thermal stability. Here, recent conceptual advances in applying MXenes and their nanocomposites in (photo)electrocatalysis and conventional heterogeneous catalysis are highlighted. In addition, the nature of active sites in the MXene‐based catalysts are discussed and the significance and challenges in the future development of catalysts using MXenes as the platforms are summarized. 相似文献
18.
Armin VahidMohammadi Mehrnaz Mojtabavi Nuala Mai Caffrey Meni Wanunu Majid Beidaghi 《Advanced materials (Deerfield Beach, Fla.)》2019,31(8)
Electrochemical capacitors (ECs) that store charge based on the pseudocapacitive mechanism combine high energy densities with high power densities and rate capabilities. 2D transition metal carbides (MXenes) have been recently introduced as high‐rate pseudocapacitive materials with ultrahigh areal and volumetric capacitances. So far, 20 different MXene compositions have been synthesized and many more are theoretically predicted. However, since most MXenes are chemically unstable in their 2D forms, to date only one MXene composition, Ti3C2Tx, has shown stable pseudocapacitive charge storage. Here, a cation‐driven assembly process is demonstrated to fabricate highly stable and flexible multilayered films of V2CTx and Ti2CTx MXenes from their chemically unstable delaminated single‐layer flakes. The electrochemical performance of electrodes fabricated using assembled V2CTx flakes surpasses Ti3C2Tx in various aqueous electrolytes. These electrodes show specific capacitances as high as 1315 F cm?3 and retain ≈77% of their initial capacitance after one million charge/discharge cycles, an unprecedented performance for pseudocapacitive materials. This work opens a new venue for future development of high‐performance supercapacitor electrodes using a variety of 2D materials as building blocks. 相似文献
19.
20.
MXenes are recently discovered 2D nanomaterial with superior mechanical, thermal, and tribological properties, being commonly employed in a wide variety of critical research areas, ranging from cancer therapy to energy and environmental applications. Due to their special properties, such as mechanoceramic nature with excellent mechanical performance, thermal stability and rich surface properties, MXenes have tremendous potential as advanced composite structures, especially those based on polymers due to a great affinity between macromolecules and the terminating groups of 2D MXenes. MXenes have been extensively explored in metal matrix nanocomposites as well as in solid- or liquid-based lubrication systems owing to the 2D structure and antifriction characteristics. The purpose of the this paper is to provide a comprehensive insight into the material, mechanical, and tribological properties of the MXene nanolayers with discussions on the recent advancements attained from MXene-reinforced nanocomposites starting with the synthesis, fabrication techniques, intricacies of the underlying physics and mechanisms, and finally focusing on the progress in computational studies. This analysis of MXene-based composites will stimulate an emerging field with innumerable opportunities and ample potentials to produce newfangled materials and structures with targeted properties. 相似文献