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Polyelectrolyte Complex Coacervates: Recent Developments and New Frontiers 聚电解质复合物凝聚体:最新进展和新领域
IF 22.6 1区 物理与天体物理 Q1 PHYSICS, CONDENSED MATTER Pub Date : 2021-03-10 DOI: 10.1146/annurev-conmatphys-042020-113457
A. Rumyantsev, N. Jackson, J. Pablo
Polyelectrolyte complex coacervates represent a wide class of materials with applications ranging from coatings and adhesives to pharmaceutical technologies. They also underpin multiple biological processes, which are only now beginning to be deciphered. The means by which molecular-scale architecture propagates into macroscopic structure, thermodynamics, and dynamics in complex coacervates is of central concern in physics, chemistry, biology, and materials science. How does polyion charge sequence dictate thermodynamic behavior? How does one tailor rheology or interfacial tension using macromolecular architecture? What emergent functionality from polymer complex coacervates has biological consequences? Recent developments in coacervate science shed light on many of these issues and raise exciting new challenges for the close integration of theory, simulations, and experiment.
聚电解质复合凝聚层代表了一类广泛的材料,其应用范围从涂料、粘合剂到制药技术。它们还支撑着多种生物过程,而这些过程现在才刚刚开始被破译。分子尺度结构在复杂凝聚层中传播到宏观结构、热力学和动力学的方式是物理学、化学、生物学和材料科学的核心问题。聚离子电荷序列如何决定热力学行为?如何使用大分子结构调整流变学或界面张力?聚合物复合物凝聚层的哪些新兴功能具有生物学后果?凝聚科学的最新发展揭示了其中的许多问题,并为理论、模拟和实验的紧密结合提出了令人兴奋的新挑战。
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引用次数: 63
On the Role of Competing Interactions in Charged Colloids with Short-Range Attraction 关于竞争相互作用在短程吸引带电胶体中的作用
IF 22.6 1区 物理与天体物理 Q1 PHYSICS, CONDENSED MATTER Pub Date : 2021-03-10 DOI: 10.1146/annurev-conmatphys-061020-053046
J. Ruiz-Franco, E. Zaccarelli
In this review, we discuss recent advances in the investigation of colloidal systems interacting via a combination of short-range attraction and long-range repulsion. The prototypical examples of t...
在这篇综述中,我们讨论了最近的研究进展在胶体系统相互作用的组合通过近距离吸引和远程排斥。的典型例子……
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引用次数: 21
Director Deformations, Geometric Frustration, and Modulated Phases in Liquid Crystals 液晶中的定向变形、几何挫折和调制相位
IF 22.6 1区 物理与天体物理 Q1 PHYSICS, CONDENSED MATTER Pub Date : 2021-03-05 DOI: 10.1146/annurev-conmatphys-031620-105712
Jonathan V Selinger
This article analyzes modulated phases in liquid crystals, from the long-established cholesteric and blue phases to the recently discovered twist-bend, splay-bend, and splay nematic phases, as well as the twist-grain-boundary (TGB) and helical nanofilament variations on smectic phases. The analysis uses the concept of four fundamental modes of director deformation: twist, bend, splay, and a fourth mode related to saddle-splay. Each mode is coupled to a specific type of molecular order: chirality, polarization perpendicular and parallel to the director, and octupolar order. When the liquid crystal develops one type of spontaneous order, the ideal local structure becomes nonuniform, with the corresponding director deformation. In general, the ideal local structure is frustrated; it cannot fill space. As a result, the liquid crystal must form a complex global phase, which may have a combination of deformation modes, and may have a periodic array of defects. Thus, the concept of an ideal local structure under geometric frustration provides a unified framework to understand the wide variety of modulated phases. Expected final online publication date for the Annual Review of Condensed Matter Physics, Volume 13 is March 2022. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.
本文分析了液晶中的调制相,从长期建立的胆甾醇相和蓝相,到最近发现的扭曲弯曲、张开弯曲和张开向列相,以及近晶相上的扭曲晶界(TGB)和螺旋纳米丝的变化。该分析使用了指向矢变形的四种基本模式的概念:扭曲、弯曲、张开,以及与鞍形张开相关的第四种模式。每种模式都与一种特定类型的分子序耦合:手性、垂直和平行于指向矢的偏振以及八极序。当液晶发展出一种自发有序时,理想的局部结构变得不均匀,并伴有相应的指向矢变形。一般来说,理想的局部结构会受挫;它无法填充空间。因此,液晶必须形成复杂的全局相,其可能具有变形模式的组合,并且可能具有缺陷的周期性阵列。因此,几何挫折下的理想局部结构的概念为理解各种调制相位提供了一个统一的框架。《凝聚态物理学年度评论》第13卷预计最终在线出版日期为2022年3月。请参阅http://www.annualreviews.org/page/journal/pubdates用于修订估算。
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引用次数: 30
Band Representations and Topological Quantum Chemistry 能带表示与拓扑量子化学
IF 22.6 1区 物理与天体物理 Q1 PHYSICS, CONDENSED MATTER Pub Date : 2020-06-08 DOI: 10.1146/annurev-conmatphys-041720-124134
Jennifer Cano, B. Bradlyn
In this article, we provide a pedagogical review of the theory of topological quantum chemistry and topological crystalline insulators. We begin with an overview of the properties of crystal symmetry groups in position and momentum space. Next, we introduce the concept of a band representation, which quantifies the symmetry of topologically trivial band structures. By combining band representations with symmetry constraints on the connectivity of bands in momentum space, we show how topologically nontrivial bands can be cataloged and classified. We present several examples of new topological phases discovered using this paradigm and conclude with an outlook toward future developments.
在本文中,我们提供了拓扑量子化学理论和拓扑晶体绝缘体的教学综述。我们首先概述了晶体对称群在位置和动量空间中的性质。接下来,我们引入带表示的概念,它量化了拓扑平凡带结构的对称性。通过将带表示与动量空间中带连通性的对称约束相结合,我们展示了拓扑非平凡带如何被编目和分类。我们提出了几个使用这种范式发现的新拓扑阶段的例子,并对未来的发展进行了展望。
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引用次数: 53
Modeling Grain Boundaries in Polycrystalline Halide Perovskite Solar Cells 多晶卤化物钙钛矿太阳能电池的晶界模拟
IF 22.6 1区 物理与天体物理 Q1 PHYSICS, CONDENSED MATTER Pub Date : 2020-04-09 DOI: 10.1146/annurev-conmatphys-042020-025347
Ji-Sang Park, A. Walsh
Solar cells are semiconductor devices that generate electricity through charge generation upon illumination. For optimal device efficiency, the photogenerated carriers must reach the electrical contact layers before they recombine. A deep understanding of the recombination process and transport behavior is essential to design better devices. Halide perovskite solar cells are commonly made of a polycrystalline absorber layer, but there is no consensus on the nature and role of grain boundaries. This review concerns theoretical approaches for the investigation of extended defects. We introduce recent computational studies on grain boundaries, and their influence on point-defect distributions, in halide perovskite solar cells. We conclude with a discussion of future research directions.
太阳能电池是一种半导体装置,在光照下通过电荷产生电能。为了获得最佳的器件效率,光产生的载流子必须在重新组合之前到达电接触层。对复合过程和输运行为的深刻理解对于设计更好的器件是必不可少的。卤化物钙钛矿太阳能电池通常由多晶吸收层制成,但对晶界的性质和作用尚未达成共识。本文综述了研究扩展缺陷的理论方法。我们介绍了最近在卤化物钙钛矿太阳能电池中晶界的计算研究及其对点缺陷分布的影响。最后,对未来的研究方向进行了展望。
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引用次数: 19
The Fracture of Highly Deformable Soft Materials: A Tale of Two Length Scales 高变形软质材料的断裂:两个长度尺度的故事
IF 22.6 1区 物理与天体物理 Q1 PHYSICS, CONDENSED MATTER Pub Date : 2020-04-07 DOI: 10.1146/annurev-conmatphys-042020-023937
Rong Long, C. Hui, J. Gong, E. Bouchbinder
The fracture of highly deformable soft materials is of great practical importance in a wide range of technological applications, emerging in fields such as soft robotics, stretchable electronics, and tissue engineering. From a basic physics perspective, the failure of these materials poses fundamental challenges due to the strongly nonlinear and dissipative deformation involved. In this review, we discuss the physics of cracks in soft materials and highlight two length scales that characterize the strongly nonlinear elastic and dissipation zones near crack tips in such materials. We discuss physical processes, theoretical concepts, and mathematical results that elucidate the nature of the two length scales and show that the two length scales can classify a wide range of materials. The emerging multiscale physical picture outlines the theoretical ingredients required for the development of predictive theories of the fracture of soft materials. We conclude by listing open challenges and directions for future investigations.
高度可变形软材料的断裂在软机器人、可拉伸电子和组织工程等领域的广泛技术应用中具有重要的实际意义。从基础物理学的角度来看,这些材料的破坏由于涉及强烈的非线性和耗散变形而带来了根本性的挑战。在这篇综述中,我们讨论了软质材料中裂纹的物理特性,并强调了表征这种材料中裂纹尖端附近的强烈非线性弹性和耗散区的两个长度尺度。我们讨论了物理过程、理论概念和数学结果,阐明了两种长度尺度的本质,并表明两种长度尺度可以对各种材料进行分类。新兴的多尺度物理图景概述了软材料断裂预测理论发展所需的理论成分。最后,我们列出了未来研究的挑战和方向。
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引用次数: 85
Statistical Mechanics of Deep Learning 深度学习统计力学
IF 22.6 1区 物理与天体物理 Q1 PHYSICS, CONDENSED MATTER Pub Date : 2020-03-16 DOI: 10.1146/annurev-conmatphys-031119-050745
Yasaman Bahri, Jonathan Kadmon, Jeffrey Pennington, S. Schoenholz, Jascha Narain Sohl-Dickstein, S. Ganguli
The recent striking success of deep neural networks in machine learning raises profound questions about the theoretical principles underlying their success. For example, what can such deep networks...
最近,深度神经网络在机器学习领域取得了惊人的成功,这引发了人们对其成功背后的理论原理的深刻质疑。例如,这样的深度网络……
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引用次数: 171
Smart Responsive Polymers: Fundamentals and Design Principles 智能响应聚合物:基本原理和设计原则
IF 22.6 1区 物理与天体物理 Q1 PHYSICS, CONDENSED MATTER Pub Date : 2020-03-10 DOI: 10.1146/annurev-conmatphys-031119-050618
D. Mukherji, C. Marques, K. Kremer
In this review, we summarize recent theoretical and computational developments in the field of smart responsive materials, together with complementary experimental data. A material is referred to as smart responsive when a slight change in external stimulus can drastically alter its structure, function, or stability. Because of this smart responsiveness, these systems are used for the design of advanced functional materials. The most characteristic properties of smart polymers are discussed, especially polymer properties in solvent mixtures. We show how multiscale simulation approaches can shed light on the intriguing experimental observations. Special emphasis is given to two symmetric phenomena: co-non-solvency and co-solvency. The first phenomenon is associated with the collapse of polymers in two miscible good solvents, whereas the latter is associated with the swelling of polymers in poor solvent mixtures. Furthermore, we discuss when the standard Flory–Huggins-type mean-field polymer theory can (or cannot) be applied to understand these complex solution properties. We also sketch a few examples to highlight possible future directions, that is, how smart polymer properties can be used for the design principles of advanced functional materials.
在这篇综述中,我们总结了最近在智能响应材料领域的理论和计算发展,以及补充的实验数据。当外界刺激的微小变化可以剧烈地改变材料的结构、功能或稳定性时,这种材料被称为智能响应材料。由于这种智能响应,这些系统被用于设计先进的功能材料。讨论了智能聚合物最典型的性质,特别是聚合物在溶剂混合物中的性质。我们展示了多尺度模拟方法如何揭示有趣的实验观察结果。特别强调了两种对称现象:共同不偿债和共同偿债。前一种现象与聚合物在两种可混溶的良好溶剂中的坍塌有关,而后一种现象与聚合物在不良溶剂混合物中的膨胀有关。此外,我们讨论了标准的flory - huggins型平均场聚合物理论何时可以(或不可以)应用于理解这些复杂的溶液性质。我们还概述了几个例子,以突出可能的未来方向,即如何将智能聚合物特性用于高级功能材料的设计原则。
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引用次数: 55
Bubbly and Buoyant Particle–Laden Turbulent Flows 充满气泡和浮力粒子的湍流
IF 22.6 1区 物理与天体物理 Q1 PHYSICS, CONDENSED MATTER Pub Date : 2020-03-10 DOI: 10.1146/annurev-conmatphys-031119-050637
V. Mathai, D. Lohse, Chao Sun
Fluid turbulence is commonly associated with stronger drag, greater heat transfer, and more efficient mixing than in laminar flows. In many natural and industrial settings, turbulent liquid flows contain suspensions of dispersed bubbles and light particles. Recently, much attention has been devoted to understanding the behavior and underlying physics of such flows by use of both experiments and high-resolution direct numerical simulations. This review summarizes our present understanding of various phenomenological aspects of bubbly and buoyant particle–laden turbulent flows. We begin by discussing different dynamical regimes, including those of crossing trajectories and wake-induced oscillations of rising particles, and regimes in which bubbles and particles preferentially accumulate near walls or within vortical structures. We then address how certain paradigmatic turbulent flows, such as homogeneous isotropic turbulence, channel flow, Taylor–Couette turbulence, and thermally driven turbulence, are modified by the presence of these dispersed bubbles and buoyant particles. We end with a list of summary points and future research questions.
与层流相比,流体湍流通常与更强的阻力、更大的传热和更有效的混合有关。在许多自然和工业环境中,湍流的液体流动包含分散的气泡和轻颗粒的悬浮液。近年来,通过实验和高分辨率直接数值模拟来理解这种流动的行为和潜在的物理特性得到了很多关注。这篇综述总结了我们目前对气泡和浮力粒子负载湍流的各种现象学方面的理解。我们首先讨论不同的动力学机制,包括交叉轨迹和尾迹诱导的上升粒子振荡,以及气泡和粒子优先积聚在壁面附近或垂直结构内的机制。然后,我们讨论了某些典型的湍流,如均匀各向同性湍流、通道流、泰勒-库埃特湍流和热驱动湍流,是如何被这些分散的气泡和浮力粒子的存在所改变的。最后,我们列出了总结要点和未来的研究问题。
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引用次数: 92
Majorana Zero Modes in Networks of Cooper-Pair Boxes: Topologically Ordered States and Topological Quantum Computation 铜对盒网络中的Majorana零模式:拓扑有序态和拓扑量子计算
IF 22.6 1区 物理与天体物理 Q1 PHYSICS, CONDENSED MATTER Pub Date : 2020-03-10 DOI: 10.1146/annurev-conmatphys-031218-013618
Y. Oreg, F. Oppen
Recent experimental progress introduced devices that can combine topological superconductivity with Coulomb-blockade effects. Experiments with these devices have already provided additional evidence for Majorana zero modes in proximity-coupled semiconductor wires. They also stimulated numerous ideas for how to exploit interactions between Majorana zero modes generated by Coulomb charging effects in networks of Majorana wires. Coulomb effects promise to become a powerful tool in the quest for a topological quantum computer as well as for driving topological superconductors into topologically ordered insulating states. Here, we present a focused review of these recent developments, including discussions of recent experiments, designs of topological qubits, Majorana-based implementations of universal quantum computation, and topological quantum error correction. Motivated by the analogy between a qubit and a spin-1/2 degree of freedom, we also review how coupling between Cooper-pair boxes leads to emergent topologically ordered insulating phases.
最近的实验进展介绍了可以将拓扑超导性与库仑封锁效应结合起来的装置。这些器件的实验已经为接近耦合半导体线中的马约拉纳零模式提供了额外的证据。他们还激发了许多关于如何利用马约拉纳线网络中库仑充电效应产生的马约拉纳零模式之间相互作用的想法。库仑效应有望成为探索拓扑量子计算机以及驱动拓扑超导体进入拓扑有序绝缘状态的强大工具。在这里,我们重点回顾了这些最新的发展,包括最近实验的讨论,拓扑量子比特的设计,基于马约拉纳的通用量子计算实现,以及拓扑量子纠错。基于量子比特和自旋1/2自由度之间的类比,我们还回顾了库珀对盒之间的耦合如何导致出现拓扑有序的绝缘相。
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引用次数: 41
期刊
Annual Review of Condensed Matter Physics
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