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Nishant Singh Georges J. M. Formon Serena De Piccoli Thomas M. Hermans 《Advanced materials (Deerfield Beach, Fla.)》2020,32(20):1906834
Fuel-driven reaction cycles are found in biological systems to control the assembly and disassembly of supramolecular materials such as the cytoskeleton. Fuel molecules can bind noncovalently to a self-assembling building block or they can react with it, resulting in covalent modifications. Overall the fuel can either switch the self-assembly process on or off. Here, a closer look is taken at artificial systems that mimic biological systems by making and breaking covalent bonds in a self-assembling motif. The different chemistries used so far are highlighted in chronological order and the pros and cons of each system are discussed. Moreover, the desired traits of future reaction cycles, their fuels, and waste management are outlined, and two chemistries that have not been explored up to now in chemically fueled dissipative self-assembly are suggested. 相似文献
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材料设计是指通过理论与计算预报新材料的组分、结构与性能。对材料不平衡凝聚非线性行为的研究发展过程、应用前景进行了评述。介绍了非线性行为在材料设计中的理论意义,分析了几种数值计算方法的优缺点。提出了材料研究微观模拟的发展方向。 相似文献
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以海藻酸钙微核为模板,采用带正电荷的聚稀丙基铵盐酸盐(PAH)和带负电荷的肝素钠(HEP),通过层层自组装(Layer-by-layer,LbL)技术构建具有多层膜结构和抗凝血活性的药物微囊.采用荧光倒置显微镜、SEM、动态光散射仪、Zeta电位仪和抗凝血仪等进行表征.结果表明,制备的海藻酸钙微核粒径约为1.5μm,尺寸均匀、分散性佳;以ALG为模板制得的LbL微囊具备典型的核壳式结构;Zeta电位检测表明,随包膜层数的增加,微囊的电位呈正负交替的变化趋势;通过体外凝血时间(PT、APtt、TT)检测微囊抗凝血活性,比较了分别以PAH和HEP作为最外层时的生物活性,其中以HEP为最外层的显著增强了材料的抗凝血性能,同时随着组装层数的增加,也提高了微囊的抗凝血性能. 相似文献
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Mg-Mg17Al12-MgO复合材料的自组织生长合成 总被引：1，自引：0，他引：1
以纯Mg粉、Al(NO3)3·9H2O粉及Al2O3粉为原料,采用原位自组织生长的方法制备成以MgO纳米线和Mg-Mg17Al12共晶体增强的镁基复合材料.采取超声波搅拌法和一般球磨法混料,通过对试样的示差扫描分析,发现Mg与Al3O3在350℃左右发生反应.当试样在550℃烧结后冷却,两相共晶Mg-Mg17Al12自组织生长形成.采用透射电镜、扫描电镜和能谱分析对烧结后试样的微观形态做表征和分析,并测试其机械性能.结果显示:超声波搅拌混合法制得的生坯组织更为致密、维氏硬度更高.文中初步建立了增强相的原位自生长动力学模型. 相似文献
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Samuel I. Stupp 《Advanced materials (Deerfield Beach, Fla.)》2020,32(20):1906741
Ranging from 2D assemblies to peptide amphiphile-based biomaterials, Prof. Samuel Stupp and his team have enriched the scientific community with many breakthroughs in the field of supramolecular self-assembly. This Interview offers the unique possibility to share some highlights along his journey, providing also a glimpse to his vision of the future of supramolecular chemistry. Interdisciplinarity is an integral part of Prof. Stupp's research philosophy, and, using his own words, “it is the only way to understand the complex universe around us and help society along the way”. What a great guideline to us all! 相似文献
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Li-Jun Ren Hong-Kai Liu Han Wu Min-Biao Hu Wei Wang 《Advanced materials (Deerfield Beach, Fla.)》2020,32(3):1805863
Cluster materials have attracted much attention because of their unique chemical and physical properties, hitherto unseen in bulk materials. Inspired by the lipid self-assembly principle, a series of heterocluster Janus molecules (HCJMs) with atomic precision have been rationally designed and synthesized by connecting different clusters via covalent bonds for the construction of nanomaterials and nano-objects. Due to their amphiphilicity, HCJMs self-assemble into cluster-containing nanomaterials or nano-objects with versatile ordered structures beyond those observed in conventional crystals. Their hybrid composition and nanoscale size are also greatly advantageous in the study of their fine structure by electron microscopy techniques, and enable their formation mechanisms to be unraveled. Finally, the influence of the characteristics of the HCJMs on the structure and properties of the self-assembled nano-objects are explored comprehensively. This synthesis strategy will promote further development of cluster materials with advanced functions via rational molecular design toward the construction of hierarchical nanostructures via molecular self-assembly. 相似文献
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Jinwan Qi;Hongxin Zhao;Wenkai Wang;Shuitao Gao;Jianbin Huang;Yun Yan; 《Small Methods》2024,8(7):2301114
Repeated programmability has emerged as a desired property in smart device engineering, but the programmability will fatigue upon repeated applications due to the unmatched mechanical property between the layer materials and the polymeric glue that is required to integrate the two individual oriented layers. It is reported here that glue-free antifatigue programmable laminate materials can be made with films resulted from solid-phase molecular self-assembly (SPMSA). The SPMSA films are created by squeezing the precipitates of oppositely charged polyelectrolytes and DTAB with a noodle machine, where the hydrophobic DTAB molecules self-assembled into wormlike micelles and oriented along the squeezing direction. The surface molecules in this film are endowed with sufficient mobility in the presence of hydration water, so that two such films are able to be pressed into a laminate material owing to the hydrophobic and electrostatic interactions between the molecules on the two adjacent surfaces. As the water evaporated gradually, the left laminate materials are glue-free with the same composition. When many of such films are integrated with specific designs, complicated shape programming is able to be achieved, and the programmability is reversible without fatigue. The current strategy is envisioned as a potent intriguing pathway leading to advanced programable materials. 相似文献
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有机-无机杂化材料研究进展 总被引：42，自引：0，他引：42
综述了有机－无机杂化材料的制备方法及影响材料结构和性能的因素,并对有机－无机碳化材料在力学,光学,电学等领域的应用进行了简要的评述。这类性能优异的新材料在未来的高科技领域必须有广阔的应用前景。 相似文献
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Samala Murali Mohan Reddy Eileen Raßlenberg Sian Sloan-Dennison Travis Hesketh Ohad Silberbush Tell Tuttle Ewen Smith Duncan Graham Karen Faulds Rein V. Ulijn Nurit Ashkenasy Ayala Lampel 《Advanced materials (Deerfield Beach, Fla.)》2020,32(46):2003511
Melanin pigments have various properties that are of technological interest including photo- and radiation protection, rich coloration, and electronic functions. Nevertheless, laboratory-based synthesis of melanin and melanin-like materials with morphologies and chemical structures that are specifically optimized for these applications, is currently not possible. Here, melanin-like materials that are produced by enzymatic oxidation of a supramolecular tripeptide structures that are rich in tyrosine and have a 1D morphology are demonstrated, that are retained during the oxidation process while conducting tracks form through oxidative tyrosine crosslinking. Specifically, a minimalistic self-assembling peptide, Lys–Tyr–Tyr (KYY) with strong propensity to form supramolecular fibers, is utilized. Analysis by Raman spectroscopy shows that the tyrosines are pre-organized inside these fibers and, upon enzymatic oxidation, result in connected catechols. These form 1D conducting tracks along the length of the fiber, which gives rise to a level of internal disorder, but retention of the fiber morphology. This results in highly conductive structures demonstrated to be dominated by proton conduction. This work demonstrates the ability to control oxidation but retain a well-defined fibrous morphology that does not have a known equivalent in biology, and demonstrate exceptional conductivity that is enhanced by enzymatic oxidation. 相似文献
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Xiaoliang Wang Xiaoman Liu Xin Huang 《Advanced materials (Deerfield Beach, Fla.)》2020,32(25):2001436
The ability of living organisms to perform structure, energy, and information-related processes for molecular self-assembly through compartmentalization and chemical transformation can possibly be mimicked via artificial cell models. Recent progress in the development of various types of functional microcompartmentalized ensembles that can imitate rudimentary aspects of living cells has refocused attention on the important question of how inanimate systems can transition into living matter. Hence, herein, the most recent advances in the construction of protein-bounded microcompartments (proteinosomes), which have been exploited as a versatile synthetic chassis for integrating a wide range of functional components and biochemical machineries, are critically summarized. The techniques developed for fabricating various types of proteinosomes are discussed, focusing on the significance of how chemical information, substance transportation, enzymatic-reaction-based metabolism, and self-organization can be integrated and recursively exploited in constructed ensembles. Therefore, proteinosomes capable of exhibiting gene-directed protein synthesis, modulated membrane permeability, spatially confined membrane-gated catalytic reaction, internalized cytoskeletal-like matrix assembly, on-demand compartmentalization, and predatory-like chemical communication in artificial cell communities are specially highlighted. These developments are expected to bridge the gap between materials science and life science, and offer a theoretical foundation for developing life-inspired assembled materials toward various applications. 相似文献
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The model of non-equilibrium solidification based on assumption of full diffusion in liquid and its lack in the solid state has been adopted in Krupkowski's evaluation to Mg–Ag alloys to describe maximum microsegregation of components in the solid solution resulting in appearance of maximum amounts of non-equilibrium phases. The results were then compared with experimental in MgAg 2.5 wt.% alloys with and without addition of 0.6 wt.% zirconium and 2.5 wt% neodymium (RE) by means of scanning and transmission electron microscopy equipped with an energy dispersive spectrometer. It was found that zirconium entered the solid solution, while neodymium appeared as a net of the Mg–Ag–Nd ternary eutectic.The homogenisation process has been studied based on hardness measurements and structure analysis. The times and temperatures of homogenisation to receive uniform distribution of components in the solid solution have been chosen neglecting the remaining eutectic precipitates due to economical reasons. 相似文献
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Jihyeon Yeom Pedro P. G. Guimaraes Hyo Min Ahn Bo-Kyeong Jung Quanyin Hu Kevin McHugh Michael J. Mitchell Chae-Ok Yun Robert Langer Ana Jaklenec 《Advanced materials (Deerfield Beach, Fla.)》2020,32(1):1903878
Chirality is ubiquitous in nature and hard-wired into every biological system. Despite the prevalence of chirality in biological systems, controlling biomaterial chirality to influence interactions with cells has only recently been explored. Chiral-engineered supraparticles (SPs) that interact differentially with cells and proteins depending on their handedness are presented. SPs coordinated with d -chirality demonstrate greater than threefold enhanced cell membrane penetration in breast, cervical, and multiple myeloma cancer cells. Quartz crystal microbalance with dissipation and isothermal titration calorimetry measurements reveal the mechanism of these chiral-specific interactions. Thermodynamically, d -SPs show more stable adhesion to lipid layers composed of phospholipids and cholesterol compared to l -SPs. In vivo, d -SPs exhibit superior stability and longer biological half-lives likely due to opposite chirality and thus protection from endogenous proteins including proteases. This work shows that incorporating d -chirality into nanosystems enhances uptake by cancer cells and prolonged in vivo stability in circulation, providing support for the importance of chirality in biomaterials. Thus, chiral nanosystems may have the potential to provide a new level of control for drug delivery systems, tumor detection markers, biosensors, and other biomaterial-based devices. 相似文献
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Naureen Akhtar ;Graeme R. Blake ;Roberto Felici ;Heinz Amenitsch ;Thomas T. M. Palstra ;Petra Rudolf 《Nano Research》2014,(12):1832-1842
Enabling the use of rationally designed thin films in technological devices is a recognized goal in materials science. However, constructing such thin films using highly ordered supramolecular architectures with well-controlled size and growth direction has remained an elusive target. Here, we introduce a layer-by- layer protocol to grow hybrid thin films of molecule-based magnetic conductors comprising arachidic acid and donor bis（ethylenedioxy）tetrathiafulvalene （BEDO-TTF） as the organic component and Cu/Gd complexes as the inorganic component. The construction of layered hybrid thin films was achieved at ambient conditions by employing the Langmuir-Blodgett method, which provides good control over film thickness and packing of molecules in the monolayer. As demonstrated by X-ray diffraction, these films are crystalline with distinct organic and inorganic sublattices, where the BEDO-TTF molecular layer is interfaced with the inorganic layer. Due to the flexibility of the Langmuir-Blodgett deposition technique, this result indicates a route toward the preparation of well-ordered films with various functionalities, determined by the choice of the inorganic compound that is combined with the π-unit of BEDO-TFF. Moreover, the ability to deposit films on a variety of substrates establishes the potential for lower-cost device fabrication on inexpensive substrates. 相似文献
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