A new electrostatic theory is presented which quantitatively explains the chromatographic separation of the hydrogen isotopes on an alumina column at low temperatures. The theory is based on the interaction of the surface electric fields of the alumina with the polarizable hydrogen isotopes. By calculating the electric fields over an adopted Al2O3 surface, it is found that there are two active adsorption sites at 77.4°K, one over a vacancy in the Al2O3 structure, and the other over an Al3+. The total interaction potential over either site is a function of the polarizabilities of the adsorbed molecules and the distance the molecules are from the surface. A 5–9 potential over a vacancy site gives results which favorably agree with experimental values. The rotational barrier, necessary to explain the separation of the ortho and para species, is shown to arise from the difference in the parallel and perpendicular components of the molecular polarizability of the hydrogen molecule.

The theory of the low-temperature chromato- graphic separation of the hydrogen isotopes

Publisher Summary The choice of the mobile and stationary phases is determined by experience in the appropriate field of application, and it is usually limited to several well-established systems Therefore, it can be useful to consider the range of substances that may fulfill the function of the solvent or the sorbent and attempt to classify them more rationally based on their physical nature and function during chromatographic sorption By applying such approach, it can be seen that sharp boundaries among single types of phases(gas, liquid, and adsorbent) are removed, as is well known from chromatographic practice, and a continuous transition from gases up to solid substances does indeed exist A sufficiently compressed gas in the supercritical region already has the properties of a liquid, and this applies even more to a completely liquefied gas A similar continuous transition also occurs in the construction of porous materials from strictly geometrically regular networks of porous crystals to substances with random porosity

Chapter 9 Sorbents

Handle everyday research tasks with reliable, citation-backed results

Your personal Research Agent to handle research tasks with citation-backed results

Popular Tasks used by Researchers

How can I help with your research?

Meet SciSpace

Get more enhanced response by uploading the PDFs you want me to reference.

No relevant PDFs in your library

SciSpace is the AI research assistant for academics. Run systematic literature reviews on 280M+ papers, and write papers with cited sources. Trusted by 1M+ students, PhDs & researchers.

SciSpace | AI for Research

Analyze PDFs

Code & Manuscripts

Funding & Grants

Literature & Patents

Medical & Clinical Data

Systematic Review

Visualize & Present

Web & Data

Build a Google Scholar-like website for your research.

Build a website

Create charts and images for your research

Create a Chart

Write a paper for submission to a journal

Draft a manuscript

Patent Search

Design eye-catching scientific posters in minutes.

Scientific Poster Generation

Systematic Literature Review

One task is running at the moment. Your messages will be shown right after.

Drag and drop or click here to browse

Loved by <highlight>1 million+</highlight> researchers

Extract a list of specific topics and their sources from unstructured text

Topics

Compare and analyze relevant papers that matches with your search

Papers

Get insights from PDFs and bookmarked papers from your library

My library

Recent searches

Try searching for:

Catch AI-generated content in scholarly and non-scholarly content

{ai} Detector

Ai Writer

Get PDF Summaries, highlighted text explanations 

Chat with PDF

Effortlessly create in-text citations and bibliographies in APA and 2,500 other formats

Citation generator

Get explanations, summaries, and answers on academic papers

Ease up your research workflow with {scispace}'s cohort of exciting AI tools

Elevate your academic writing skills and convey your ideas the way you want

Paraphraser

Explore our range of reading and writing tools

Your file is being prepared and should be ready in a few minutes. If it's a large file, it might take a bit longer. You can close this window, and we'll email you the file when it's done.

You have reached a maximum limit of <strong>{limit}</strong> columns in the table. Remove at least <strong>1</strong> column to add or create another one.

O. Mikeš

Author Tools

Chat about Author

Papers

Chapter 9 Sorbents