Self-Organization in Network Glasses

网络眼镜中的自组织

• 批准号: 0456472
• 负责人: Punit Boolchand
• 金额: --
• 依托单位: University of Cincinnati Main Campus
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-01-15 至 2009-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0456472&HistoricalAwards=false
• 关键词: Self; Organization; Network; Glasses

Controlled laboratory experiments on network glasses have recently permitted decoding the physical principles that underlie self-organization of disordered systems. Of particular interest, is the discovery of an "intermediate phase", which is bounded by the rigidity and stress transitions. This phase displays most unusual physical behavior including glass transitions (Tg) that are almost completely thermally reversing in character and not aging with time at T Tg. This award will focus on sulfide- and oxide-glasses, in which the nature of the intermediate phases will be explored using Raman scattering and modulated Differential Scanning Calorimetric experiments. These glasses are widely used in photonic and electronic applications, and the discovery of such phases in these systems will impact information storage and memory applications. Graduate, undergraduate, and high school students will participate in this project, receiving training in this field and also sharing in the excitement of discoveries of new glassy phases. An exchange of ideas and knowledge among the participants and colleagues at other US universities and abroad will be continue to strengthen the research. Certain liquids upon cooling form disordered solids that consist of networks of specific building blocks like tetrahedra or pyramids. These solids are called network glasses and silica is a familiar example. Under specific conditions network glasses can self-organize to display intriguing physical properties such as thermally reversing glass transitions and absence of time evolution in structure at temperatures below the glass transition temperature. The atomic structural arrangements that lead to self-organization of disordered networks are of scientific interest, and will be examined using sophisticated light scattering and thermal probes. This project will focus on sulfide- and oxide-glasses, in which novel glassy phases are expected. These materials are most widely used in photonic and electronic applications, and the discovery of such phases in these systems could have profound consequences on their applications. Two full time graduate students including a female student, two part-time undergraduate students, and two high-school students working in summer recess will be involved in the scientific discovery phase of this work.

网络玻璃上的受控实验室实验最近允许解码无序系统自我组织的物理原理。 特别令人感兴趣的是“中间阶段”的发现，该阶段受刚性和应力转变的界定。该阶段显示出最不寻常的身体行为，包括玻璃跃迁（TG），几乎完全在特征上完全逆转，而不会随着TG时的时间而衰老。该奖项将集中于硫化物和氧化物玻璃，其中将使用拉曼散射和调制差扫描量热实验探索中间相的性质。这些眼镜广泛用于光子和电子应用中，在这些系统中发现此类阶段将影响信息存储和内存应用。毕业生，本科和高中生将参加该项目，接受该领域的培训，并分享新玻璃阶段发现的兴奋。 美国其他大学和国外的参与者和同事之间的思想和知识交流将继续加强研究。 冷却后的某些液体形成无序的固体，这些固体由特定构件（如四面体或金字塔）组成。这些固体称为网络眼镜，二氧化硅是一个熟悉的例子。在特定条件下，网络玻璃可以自组织以显示有趣的物理特性，例如在玻璃过渡温度以下的温度下，玻璃过渡的热逆转和没有时间演变。导致无序网络自组织的原子结构排列具有科学意义，将使用复杂的光散射和热探针进行检查。该项目将集中于硫化物和氧化物玻璃，其中预期新型玻璃相。这些材料最广泛地用于光子和电子应用中，并且在这些系统中发现此类阶段可能会对它们的应用产生深远的影响。两名全职研究生，包括一名女学生，两名兼职本科生以及两名在夏季休假工作的高中生，将参与这项工作的科学发现阶段。