| 单词 | diazo |
| 例句 | So I think the room where they kept the diazo machine became like my studio. Arlene Shechet Creates Beauty Out of Chaos 2020-02-27T05:00:00Z Bichromates, although containing much available oxygen, form but feeble explosive mixtures, but some compounds of chromic acid with diazo compounds and some acetylides are extremely powerful as well as sensitive. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 1 "Evangelical Church Conference" to "Fairbairn, Sir William" 2011-07-16T02:00:16.387Z A diazo salt is formed, and is then made to react in solution with a hydroxy compound or an amino compound, &c., with the formation of a highly coloured azo compound. The New Gresham Encyclopedia Volume 4, Part 1: Deposition to Eberswalde 2011-04-14T02:00:57.977Z The necessary diazo compound is prepared by allowing a solution containing nitrous acid to act upon a solution of a primary aromatic amine. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 8 "Dubner" to "Dyeing" 2010-12-26T03:00:17.840Z These compounds may be divided into two classes, namely, the true diazo compounds, characterized by the grouping −N = N−, and the diazonium compounds, characterized by the grouping N ∶ N <. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 4 "Diameter" to "Dinarchus" Somewhat later, they found that it could be prepared from diazobenzene imide, provided a nitro group were present in the ortho or para position to the diazo group. Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 1 "Austria, Lower" to "Bacon" By the action of nitrous acid at low temperatures on aromatic amines, e.g. aniline, C6H5NH2, diazo compounds are produced. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 1 "Evangelical Church Conference" to "Fairbairn, Sir William" 2011-07-16T02:00:16.387Z The diazo compound is then said to be coupled. The New Gresham Encyclopedia Volume 4, Part 1: Deposition to Eberswalde 2011-04-14T02:00:57.977Z It is usually desirable to keep the solutions cool with ice, owing to the very unstable nature of the diazo compounds produced. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 8 "Dubner" to "Dyeing" 2010-12-26T03:00:17.840Z The constitution of the isomeric diazo hydroxides has given rise to much discussion. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 4 "Diameter" to "Dinarchus" The diazo compounds formed on the fibre are not very stable bodies. The Dyeing of Cotton Fabrics A Practical Handbook for the Dyer and Student As many of these diazo compounds contain no oxygen their explosive nature must be ascribed to the peculiar state of union of the nitrogen. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 1 "Evangelical Church Conference" to "Fairbairn, Sir William" 2011-07-16T02:00:16.387Z For this purpose it is usually only necessary to prepare a solution containing the diazo compound. The New Gresham Encyclopedia Volume 4, Part 1: Deposition to Eberswalde 2011-04-14T02:00:57.977Z The colour obtained varies according to the particular diazo compound, as well as the amine or phenol employed, β-naphthol being the most useful among the latter. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 8 "Dubner" to "Dyeing" 2010-12-26T03:00:17.840Z In the azo group some colors are fugitive, others are moderately fast, and it is generally recognized that certain classes of the tetrazo compounds are distinctly faster than the ordinary diazo colors. Scientific American Supplement, No. 810, July 11, 1891 The presence of an excess of nitrite can be determined by testing the diazo solution with potassium iodide starch paper, which in the presence of excess of nitrite gives the blue iodine starch reaction. The Dyeing of Cotton Fabrics A Practical Handbook for the Dyer and Student The dyed colour here plays the part of a phenol or amine, and reacts with the diazo compound to produce a new colour. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 8 "Dubner" to "Dyeing" 2010-12-26T03:00:17.840Z Now the diazo compounds are rather unstable bodies, but they have a great affinity for other compounds, such as naphthol, phenylene diamine, phenol, and combine easily with them when brought into contact with them. The Dyeing of Cotton Fabrics A Practical Handbook for the Dyer and Student The same coloured precipitates are produced upon the cotton fibre if the material is first impregnated with an alkaline solution of the phenol, then dried and passed into a cold solution of the diazo solution. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 8 "Dubner" to "Dyeing" 2010-12-26T03:00:17.840Z This diazo liquor will keep for some days, but it decomposes in time, so that it should not be kept too long. The Dyeing of Cotton Fabrics A Practical Handbook for the Dyer and Student Some dyers use ice in preparing their diazo solutions, and certainly the best results are attained thereby, but with paranitroaniline the ice can be dispensed with. The Dyeing of Cotton Fabrics A Practical Handbook for the Dyer and Student The diazotisation is better carried out and the diazo solution rendered more stable if another molecule of hydrochloric acid and an excess of nitrite of soda are used. The Dyeing of Cotton Fabrics A Practical Handbook for the Dyer and Student By the action of nitrous acid upon the salts of the primary organic amines the so-called diazo compounds are formed. The Dyeing of Cotton Fabrics A Practical Handbook for the Dyer and Student The following Direct Colours, after being applied to cotton, may be submitted to the above treatment, the colours produced being chiefly blue, brown and black:— Blue.—Diazurine, diazo blue, diamine blue, diaminogene. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 8 "Dubner" to "Dyeing" 2010-12-26T03:00:17.840Z As the cotton yarn is being passed through the developing bath, the latter is freshened up from time to time by suitable additions of the diazo and acetate liquors in the proportions given above. The Dyeing of Cotton Fabrics A Practical Handbook for the Dyer and Student |
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