1 Introduction in Fluctuation-induced Forces: A Brief Review

2 The Model

3 On the Behavior of the Model in Grand Canonical Ensemble

4 Behavior of the Casimir Force in Ising Chain with Defect Bond

5 On the Behavior of the Model in Canonical Ensemble

6 Behavior of the Helmholtz Force in Ising Chain with Defect Bond

7 Discussion and Concluding Remarks