Application of quasi-elastic neutron scattering to dynamics study of confined water

LI Hua; ZHANG Lili; YI Zhou

doi:10.11889/j.0253-3219.2014.hjs.37.020604

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Application of quasi-elastic neutron scattering to dynamics study of confined water

更新时间：2021-03-03

- Application of quasi-elastic neutron scattering to dynamics study of confined water
- NUCLEAR TECHNIQUES Vol. 37, Issue 2, Article number: 020604(2014)
- 作者机构：
  
  暨南大学物理系,广州,510632
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2014.hjs.37.020604
  CLC：
- Published：19 February 2014
- 稿件说明：
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LI Hua, ZHANG Lili, YI Zhou. Application of quasi-elastic neutron scattering to dynamics study of confined water[J]. Nuclear techniques, 2014, 37(2): 020604
DOI：

LI Hua, ZHANG Lili, YI Zhou. Application of quasi-elastic neutron scattering to dynamics study of confined water[J]. Nuclear techniques, 2014, 37(2): 020604 DOI： 10.11889/j.0253-3219.2014.hjs.37.020604.

摘要

准弹性中子散射(Quasi-elastic neutron scattering

QENS)实验是研究受限水动态的一种重要实验手段。水泥样品中存在有结合水和受限水，各自的含量随着水泥样品的老化时间、环境温度、水和水泥(w/c)质量比、添加剂等因素的不同而变化，处于强受限状态的水的动态特性影响着水泥石的耐久性和力学特性，因此，水泥样品中受限水动态的研究具有重要的意义。本文综述了近年来水泥样品中受限移动水含量比例和受限水动态的QENS实验研究，着重介绍采用弛豫盒子模型(Relaxing cage model

RCM)，对QENS谱实验数据的拟合分析，得到描述水泥样品中受限水动态相关信息的关键物理参数：受限移动水比例系数1?p，微纳孔中受限水分子在某位置上的诱捕(俘获)时间?0、受限水平均迁移弛豫时间

Abstract

Background: Quasi-elastic neutron scattering (QENS) is an important experiment for dynamics study of confined water. It is significant to study the dynamics of confined water in cement paste. Purpose: In this paper

we have two aims. One is to present a reviewer of QENS study on dynamics of confined water in cement paste in recent years. The other is to illustrate the QENS application to the study on dynamics of confined water based on cement paste. Method: Relaxing cage model (RCM) is specially introduced for the analyses of QENS spectra. Results: Based on RCM

several parameters for describing the dynamics of confined water in cement paste

can be obtained from the analyses of QENS spectra: a fraction of mobile ‘glassy’ water molecules embedded in amorphous gel region surrounding the hydration products

1-p

the capture time of confined water molecule in some place-?0

the average translational relaxation time-Cited

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