A variable-temperature single-crystal X-ray diffraction study revealed an unusual thermal expansion property of a bis(imidazolium) terephthalate salt with helical hydrogen-bonded network. The anomalous was investigated by diffraction, infrared, and Raman spectroscopy techniques. Positive, negative, near-zero were observed along the crystallographic b, c, axes, respectively. can be explained at ...

We investigate the optical property of monolayer and layered BiI$_3$ reveal presence exciton only in crystal. evaluate energy spectrum a dielectric function by using time-dependent density functional theory. Bulk crystal is an atomic semiconductor with band gap corresponding to frequency visible light. The numerical result for bulk confirmed be consistent previous experimental results it does n...

Model peptides were designed, synthesized and conducted a detailed structure-property study to unravel the molecular mechanism of goose eggshell calcification. The peptides were designed based on the primary structural features of the eggshell matrix proteins ansocalcin and OC-17. In vitro CaCO3 crystal growth experiments in presence of these peptides showed calcite crystal aggregation as obser...