Daguerre

Studies of surfaces and surface properties can be traced to the early 1800s [1]. Processes that involved surfaces and surface chemistry, such as heterogeneous catalysis and Daguerre photography, were first discovered at that time. Since then, there has been a continual interest in catalysis, corrosion and other chemical reactions that involve surfaces. The modem era of surface science began in the late 1950s, when instmmentation that could be used to investigate surface processes on the molecular level started to become available. 

L. J. M. Daguerre s photographic process (silver plate sensitized by exposure to iodine vapour)... 

The first permanent images were obtained by the French landowner . N. Niepce using bitumcn-coated pewter (bitumen hardens when expo.sed to light for several hours and the unexposed portions can then be dissolved away in oil of turpentine). He then helped the portrait painter, L. J. M. Daguerre, to perfect the daguerreotype process which utilized plates of copper coated with silver sensitized with iodine vapour. The announcement of this process in 1839 was greeted with enormous enthusiasm but it. suffered from the critical drawback that each picture was unique and could not be duplicated. 

Py X., Daguerre E., Menard D. Composites of expanded natural graphite and in situ prepared activated carbons. Carbon 2002 40 1255-65. 

Although silver halide photography dates from 1839 when Daguerre and Talbot disclosed their inventions, there is no general agreement on the mechanism of latent image formation. 

In the 1830s L. J. M. Daguerre solved the problem of photo permanency. His specially treated plate was a sheet of copper (Cu) plated on one side with silver. The silver was oxidized with iodine (I) vapor to produce silver ions ... 

Daguerre used sodium thiosulfate (Na2S203) to make the photo permanent. Today we still use sodium thiosulfate for this purpose, but we call it hypo. The sodium thiosulfate removes unexposed silver bromide (AgBr) as follows ... 

In 1839, Romantic painter and printmaker Louis-Jacques-Mande Daguerre revealed an invention to the... 

Many years ago, a Frenchman named Louis Daguerre discovered how to do just what you have done, but instead of paper he used pieces of silver. Later photographers made tintypes, which were simply Daguerrotypes made on tin plates instead of silver ones. 

The possibility of developing the latent image was discovered by Daguerre, who at first employed a silver plate coated with the iodide, development being effected by exposing the plate to the action of mercury-vapour. Later, he substituted glass for silver, and developed with a mixture of silver nitrate and ferrous sulphate. His discovery led to the introduction of the wet collodion-process with silver iodide as the sensitive material. 

We may add that the polynomials / are known as Daguerre s polynomials these, however, we shall not discuss in more detail here, except to mention that their zeros determine the position of the nodal surfaces r = const. in fact, R has % nodes, not counting the zeros for r = 0 (in the case where I > 0) and r = oo,... 

L. J. M. Daguerre s photographic process (silver plate sensitized by exposure to iodine vapour) Introduction of (light sensitive) AgBr into photography Iodine (as iodate) found in Chilean saltpetre by A. A. Hayes... 

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