{'fraction_non_alphanumeric': 0.032133676092544985, 'fraction_numerical': 0.0012853470437017994, 'mean_word_length': 5.601694915254237, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Surface freezing in binary mixtures of alkanes: New phases and phase transitions.

Surface freezing of a crystalline monolayer has been observed at the free surface of liquid binary mixtures of normal alkanes by x-ray and surface tension measurements. Two dramatically different behaviors are found for the monolayer properties depending on {Delta}{ital n}, the difference in the components` carbon numbers. For small {Delta}{ital n}, the variation with temperature and concentration is continuous. For large {Delta}{ital n}, the variation is discontinuous, exhibiting surface segregation and 2D structural phase transitions. A theory based on competition between entropic mixing and a repulsive interaction due to chain length mismatch accounts well for the observed phenomena.