4-Cyano-4'-n-octylbiphenyl, commonly known as 8CB, is one of the most widely recognized and frequently cited liquid crystal compounds in materials science literature. The molecule comprises a rigid biphenyl core, a highly polar terminal cyano group, and a straight octyl chain consisting of eight carbon atoms. This particular chain length is what distinguishes 8CB, as the compound is renowned for exhibiting a smectic A phase in addition to a nematic phase, making it a primary model material for investigating layered structures, interphase transitions, and partial ordering phenomena within soft matter systems.
The advantages that make 8CB a preferred choice lie in its rich yet thoroughly documented phase behavior, which allows experimental results to be readily validated against established literature references. The cyano group provides positive dielectric anisotropy, enabling molecules to be easily oriented by electric fields, while the biphenyl core produces high birefringence and distinctive optical textures characteristic of each phase. The tendency of the molecules to form antiparallel pairs has also become a dedicated topic of study in understanding the origin of smectic layering, further cementing the role of 8CB as a benchmark compound in liquid crystal research.
In Indonesian laboratories, 8CB is frequently employed as an internal standard when a research group calibrates new liquid crystal characterization setups or validates measurement protocols. Universities and research institutions across Indonesia utilize this compound for teaching and investigating soft matter physics, display technology fundamentals, and advanced materials characterization. Its well-established properties make it an ideal reference material for graduate research projects and collaborative studies in condensed matter science.
- Liquid crystal phase transition studies, because 8CB exhibits both smectic A and nematic phases with well-documented transition temperatures that enable reproducible experimental observations.
- Soft matter physics research, as the compound serves as a model system for investigating partial ordering phenomena and layered molecular structures in condensed matter systems.
- Dielectric anisotropy measurements, since the polar cyano group provides positive dielectric anisotropy that allows researchers to study molecular orientation under applied electric fields.
- Optical texture characterization using polarized light microscopy, because the biphenyl core produces high birefringence and distinctive textures that are unique to each mesophase.
- Calibration and validation of new analytical instruments, given that the extensive published literature on 8CB allows laboratories to benchmark their measurement results against established reference data.
| Brand | TCI |
|---|---|
| CAS number | 52709-84-9 |
| Molecular formula | — |
| Purity | — |
| Category | Materials Science > Electronic Materials > Liquid Crystal (LC) Materials |
| Pack sizes | Available in standard laboratory quantities; refer to current product listing for details |
| Physical form | — |
| Storage | Store in a cool, dry place away from direct light; refer to the manufacturer safety data sheet for detailed conditions |
- Product Code: C3156
Store 4-Cyano-4'-n-octylbiphenyl in a tightly sealed container in a cool, dry environment away from direct sunlight and heat sources. Suitable containers include amber glass bottles or the original manufacturer packaging to minimize exposure to light and moisture. Always handle the compound while wearing appropriate personal protective equipment, including gloves, safety goggles, and a laboratory coat. Work in a well-ventilated area or fume hood when handling fine powders or performing heating procedures. Consult the manufacturer safety data sheet for complete handling precautions and disposal guidelines before use.
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