{'fraction_non_alphanumeric': 0.028233151183970857, 'fraction_numerical': 0.00546448087431694, 'mean_word_length': 5.28, '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}}
Straight and Branched Goethite Topology by Oriented Attachment at High pH

In this study, we report novel anisotropic nanostructures of goethite (alpha-FeOOH) nanocrystallites induced by oriented attachment at high pH in the absence of organic additives. Combined transmission electron microscopy, high-resolution transmission electron microscopy, and atomic force microscopy analyses shed new light on different stages of the oriented attachment process. It is found that a straight prerod intermediate was assembled by crystallographically aligned nanoparticles with a rectangular shape; a V-shaped structure with an angle of (118.5 ± 3.5)° was connected by apexes of two needle-shaped rods sharing three comparable dimensions, while a Y shape was constructed by a V-shaped rod and a straight one through planar stacking. This is the first example of such a straight and branched topology achieved at high pH without the assistance of organic additives. Our findings will be potentially applicable to a range of naturally abundant colloidal nanocrystallites (e.g., metal (oxyhydr)oxide and sul...