용융법과 졸겔법을 이용하여 4티탄산칼륨(K₂Ti₄O_9)을 합성하여 형상 및 표면적 변화를 연구하였다. 용융법으로 생성한 K₂Ti₄O_9보다 졸겔법의 경우 더 길고 얇은 섬유상인 길이 7-10㎛, L/D가 40-50 K₂Ti₄O_9가 성장되었다. 초임계 건조를 적용한 졸겔법으로부터 초임계 건조 후 섬유상의 중간체가 형성이 되었고 이를 다시 소성시킴에 따라 길이 0.5-1 ㎛, L/D는 10-300의 K₂Ti₄O_9 섬유를 얻을 수 있었다. 표면적은 초임계 건조를 행한 졸겔법의 경우 가장 큰 20-25 ㎡/g를 나타내었다. 형성된 K₂Ti₄O_9의 형태와 표면적은 합성방법과 조건에 영향을 받는 것으로 나타났다.

Potassium tetratitanate(K₂Ti₄O_9) was synthesized by melting method and sol-gel method. Changes of morphology and surface area of K₂Ti₄O_9 were also investigated. In sol-gel method, K₂Ti₄O_9 fiber was formed with 7-10 ㎛ in length and L/D was 40-50 which is higher than that of melting method. Intermediate phase was obtained by sol-gel method adopted with supercritical drying. After calcination of the intermediate phase, K₂Ti₄O_9 fibers were formed with 0.5-1 ㎛ in length and L/D was 10-300, which is thinner and shorter than that of melting and sol-gel method. By using so1-gel method adopted supercritical drying, the highest surface area of 20-25 ㎡/g was obtained. The morphology and surface area of K₂Ti₄O_9 were affected by synthetic methods and conditions.