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Equipment for Multiple Projects: Cisorp Water Sorption Analyser.

适用于多个项目的设备：Cisorp 水吸附分析仪。

基本信息

批准号：
EP/F037813/1
负责人：
Moira Wilson
金额：
$ 8.5万
依托单位：
University of Manchester
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2008
资助国家：
英国
起止时间：
2008 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FF037813%2F1
关键词：
Equipment Multiple Projects Cisorp Water

项目摘要

The purpose of the CI water sorption analyser microbalance is to support a number of ongoing funded research activities and to enable a wide range of further work within the Construction Science Research Group at the University of Manchester and its wider associated network (Centre for Materials Science and Engineering, The University of Edinburgh; the Interface Analysis Centre, University of Bristol). The microbalance will have substantial input into currently funded work on lime mortar systems and will enable studies not only of carbonation rates but also of hydration rates in these materials. The applicants recently published a new kinetic law which shows that the mass gain and associated expansive strain caused by the chemisorption of atmospheric moisture by fired clay ceramics are both proportional to (time)1/4. This progressive chemically driven process indicates a very remarkable rehydroxylation of the fired clay which is so slow that it continues certainly over all practical historical timescales. Indeed we have found residual reactivity in 2000 year old ceramic. The extremely slow progress of the reaction appears to be fundamental to these materials and must be scientifically significant. The underlying mechanisms of this reaction are as yet far from understood. It is the exploitation of this (time)1/4 law as a method of archaeological dating that forms the core of the proposed microbalance work. We have shown that it is possible to estimate the age of a ceramic artefact by measuring its mass prior to reheating and comparing this with the subsequent mass gain from the same sample following reheating. Measurement of the mass gain provides calibration data that define the rate of mass gain with time for that particular material. The specimen's age may therefore be established by extrapolation of the data to determine the time at which the measured long-term mass would be attained. Since the method is self-calibrating, the effects of differences in firing temperature, mineralogy, composition etc are eliminated. This work requires the extremely high-accuracy weighing of ceramic samples under precisely controlled conditions of temperature and relative humidity. In parallel with this, such a measurement technique is a powerful means of gaining insight into the underlying chemisorptive mechanisms. Further, the instrument will enable a diverse range of studies which would otherwise be inaccessible with conventional measurement techniques. These include the investigation of chemisorption reactions in glasses (particularly in polluting atmospheres) and investigations of the degradation mechanisms in natural building stones - in this case with a focus on urban atmospheric pollutants.

CI水吸附分析仪微量天平的目的是支持一些正在进行的资助研究活动，并在曼彻斯特大学的建筑科学研究小组及其更广泛的相关网络（爱丁堡大学材料科学与工程中心;布里斯托大学界面分析中心）内开展广泛的进一步工作。微量天平将为目前资助的石灰砂浆系统工作提供大量投入，并将使这些材料不仅能够研究碳酸化速率，而且能够研究水合速率。申请人最近公布了一个新的动力学定律，该定律表明，由烧制的粘土陶瓷对大气水分的化学吸附引起的质量增加和相关的膨胀应变都与（时间）1/4成比例。这种渐进的化学驱动过程表明烧制粘土的非常显著的再羟基化，其是如此缓慢，以至于在所有实际的历史时间尺度上肯定会继续。事实上，我们已经在2000年的陶瓷中发现了残留的反应性。反应的极其缓慢的进展似乎是这些材料的基础，必须具有科学意义。这种反应的基本机制还远未被理解。正是利用这个（时间）1/4定律作为考古学定年的方法，形成了拟议中的微量天平工作的核心。我们已经证明，通过测量再加热前的质量并将其与再加热后同一样品的质量增加进行比较，可以估计陶瓷制品的年龄。质量增加的测量提供了校准数据，该校准数据定义了该特定材料随时间的质量增加速率。因此，样品的年龄可以通过数据的外推来确定，以确定获得测量的长期质量的时间。由于该方法是自校准的，因此消除了烧制温度、矿物学、成分等差异的影响。这项工作需要在精确控制的温度和相对湿度条件下对陶瓷样品进行极高精度的称重。与此同时，这种测量技术是深入了解潜在化学吸附机制的有力手段。此外，该仪器将能够进行各种各样的研究，否则传统测量技术无法进行这些研究。其中包括研究玻璃中的化学吸附反应（特别是在污染的大气中）和研究天然建筑石材的降解机制-在这种情况下，重点是城市大气污染物。