Collaborative Research: Structure and Dynamics of Metal Soap Aggregates at the Pigment/Binder Interface. A Multinuclear Solid-State NMR Study

合作研究：颜料/粘合剂界面金属皂聚集体的结构和动力学。

• 批准号: 1139180
• 负责人: Silvia Centeno
• 金额: $ 37.87万
• 依托单位: Metropolitan Museum of Art
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-10-01 至 2016-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1139180&HistoricalAwards=false
• 关键词: Collaborative; Research; Structure; Dynamics; Metal

With support from the Chemical Measurement and Imaging program in the Division of Chemistry, Dr. Silvia Centeno of the Metropolitan Museum of Art in New York City and Prof. Cecil Dybowski of the University of Delaware, will study the mechanism of aggregation of lead carboxylates (lead soaps) in oil paintings. Aggregation of lead carboxylates in oil paintings is known to lead to the formation of protrusions and paint loss in most cases, and to increased transparency of the paint films in others, resulting in damage to the integrity of the artworks. While widely observed, the phenomenon is not well understood. The collaborating investigators, their students and postdoctoral trainees will determine the structure, molecular dynamics, and phase behavior of lead carboxylates using solid state 13C,207Pb magic-angle-spinning (MAS) nuclear magnetic resonance (NMR), 1H-207Pb and 13C-207Pb dipolar re-coupling experiments, and deuterium NMR along with other analytical tools. They will elucidate the mechanism of aggregate formation/migration and based on the results, recommend procedures to arrest the deterioration process of oil paintings.The solid state NMR experiments have the potential to transform the field of cultural heritage science since they will provide molecular information, which is not currently available to the cultural heritage science community. The experiments are a gateway to the application of emerging minimally invasive NMR methods like micro-MAS NMR to study cultural heritage objects. Advancing the state of the art for 207Pb solid-state NMR also has broader implications for understanding the structure of lead-containing electronic and optoelectronic materials, high-Tc superconducting materials, and the speciation and reaction of lead in environmentally contaminated materials. The project will provide excellent training opportunities to students and postdoctoral researchers who wish to train in state of the art solid state NMR methods and cultural heritage science. Results of this study will be widely disseminated to the public through museum programs and publications.

在化学部化学测量和成像项目的支持下，纽约市大都会艺术博物馆的Silvia Centeno博士和特拉华州大学的塞西尔Dybowski教授将研究油画中羧酸铅（铅皂）的聚集机制。已知油画中羧酸铅的聚集在大多数情况下会导致突起的形成和油漆损失，并且在其他情况下会增加漆膜的透明度，从而导致对艺术品完整性的损害。虽然这一现象被广泛观察到，但人们并不十分了解。合作的研究人员，他们的学生和博士后学员将使用固态13 C，207 Pb魔角旋转（MAS）核磁共振（NMR），1H-207 Pb和13 C-207 Pb偶极再偶联实验，以及氘NMR沿着与其他分析工具一起确定羧酸铅的结构，分子动力学和相行为。他们将阐明聚集体形成/迁移的机制，并根据结果提出阻止油画劣化过程的方法。固态核磁共振实验具有改变文化遗产科学领域的潜力，因为它们将提供文化遗产科学界目前无法获得的分子信息。这些实验是应用新兴微创NMR方法（如micro-MAS NMR）研究文化遗产对象的门户。推进207 Pb固态NMR的最新技术水平也对理解含铅电子和光电材料、高Tc超导材料的结构以及环境污染材料中铅的形态和反应具有更广泛的意义。该项目将为希望在最先进的固态NMR方法和文化遗产科学方面接受培训的学生和博士后研究人员提供极好的培训机会。 这项研究的结果将通过博物馆项目和出版物向公众广泛传播。