| 单词 |
hydrocolloid |
| 释义 |
hydrocolloid|haɪdrəʊˈkɒlɔɪd|
Also (with hyphen) hydro-colloid.
[f. hydro- + colloid a. and n.]
Any substance that will form a gel on the addition of water; a gel so produced. Also attrib. or as adj.
1926Brit. Pat. 271,306, The subject matter of the present invention is a reversible hydro-colloid mass which may serve for..enabling castings to be taken from the oral cavity for dental purposes. 1946C. K. Tseng in J. Alexander Colloid Chem., Theoret. & Appl. VI. xxxi. 717 Agar is a reversible hydrocolloid and materials made with it must be warmed to a solution and cooled to a gel. 1954Adv. Chem. Ser. XI. 92 Irish moss extractive, also known as carrageenin,..is a hydrocolloid gum. 1955Sturdevant & Brauer in J. C. Brauer Dental Asst. xx. 287 The reversible hydrocolloids are used for tray impressions to form casts of the teeth and jaws.
Hence ˌhydrocoˈlloidal a.
1928Chem. Abstr. XXII. 1659 A mixt. of rubber, fatty substances and resins is incorporated, in fine distribution, in a hydrocolloidal mucilaginous basic substance such as sea weeds or algaceous plants. 1947J. C. Rich Materials & Methods Sculpture v. 96 Commercial hydrocolloidal compositions. 1956J. N. Anderson Appl. Dental Materials xx. 240 All hydrocolloidal gels consist largely of water enclosed rather loosely within the gel fibrils. |
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