{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2017:H6UVK4VKPPYEE7LIUREVYPML6U","short_pith_number":"pith:H6UVK4VK","schema_version":"1.0","canonical_sha256":"3fa95572aa7bf0427d68a4495c3d8bf516d3bec2c49edba871b693b495dc3a87","source":{"kind":"arxiv","id":"1705.07060","version":1},"attestation_state":"computed","paper":{"title":"H4-Alkanes: A new class of hydrogen storage material?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"D. Harrison, E. Welchman, T. Thonhauser","submitted_at":"2017-05-19T15:45:57Z","abstract_excerpt":"The methane-based material (H$_2$)$_4$CH$_4$, also called H4M for short, is in essence a methane molecule with 4 physisorbed H$_2$ molecules. While H4M has exceptionally high hydrogen storage densities when it forms a molecular solid, unfortunately, this solid is only stable at impractically high pressures and/or low temperatures. To overcome this limitation, we show through simulations that longer alkanes (methane is the shortest alkane) also form stable structures that still physisorb 4 H$_2$ molecules per carbon atom; we call those structures H4-alkanes. We further show via molecular dynami"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1705.07060","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2017-05-19T15:45:57Z","cross_cats_sorted":[],"title_canon_sha256":"158edbf19c637d984649766c173666c8410d21036b7f09809f2f324a666b21a0","abstract_canon_sha256":"20ece810a6e2b76f90a177b94a708faa1a90e39ea1e56d3ffee4e1296fd17ca2"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:44:10.706912Z","signature_b64":"OaRH+PGl8b88y392iUE/J7D083vq4Trh0CiwkffaOEWJYyqAHYkX++kLbKY74bPPj00MxRlIvpubmUMrImvYDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3fa95572aa7bf0427d68a4495c3d8bf516d3bec2c49edba871b693b495dc3a87","last_reissued_at":"2026-05-18T00:44:10.706275Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:44:10.706275Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"H4-Alkanes: A new class of hydrogen storage material?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"D. Harrison, E. Welchman, T. Thonhauser","submitted_at":"2017-05-19T15:45:57Z","abstract_excerpt":"The methane-based material (H$_2$)$_4$CH$_4$, also called H4M for short, is in essence a methane molecule with 4 physisorbed H$_2$ molecules. While H4M has exceptionally high hydrogen storage densities when it forms a molecular solid, unfortunately, this solid is only stable at impractically high pressures and/or low temperatures. To overcome this limitation, we show through simulations that longer alkanes (methane is the shortest alkane) also form stable structures that still physisorb 4 H$_2$ molecules per carbon atom; we call those structures H4-alkanes. We further show via molecular dynami"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1705.07060","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"aliases":[{"alias_kind":"arxiv","alias_value":"1705.07060","created_at":"2026-05-18T00:44:10.706400+00:00"},{"alias_kind":"arxiv_version","alias_value":"1705.07060v1","created_at":"2026-05-18T00:44:10.706400+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1705.07060","created_at":"2026-05-18T00:44:10.706400+00:00"},{"alias_kind":"pith_short_12","alias_value":"H6UVK4VKPPYE","created_at":"2026-05-18T12:31:18.294218+00:00"},{"alias_kind":"pith_short_16","alias_value":"H6UVK4VKPPYEE7LI","created_at":"2026-05-18T12:31:18.294218+00:00"},{"alias_kind":"pith_short_8","alias_value":"H6UVK4VK","created_at":"2026-05-18T12:31:18.294218+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/H6UVK4VKPPYEE7LIUREVYPML6U","json":"https://pith.science/pith/H6UVK4VKPPYEE7LIUREVYPML6U.json","graph_json":"https://pith.science/api/pith-number/H6UVK4VKPPYEE7LIUREVYPML6U/graph.json","events_json":"https://pith.science/api/pith-number/H6UVK4VKPPYEE7LIUREVYPML6U/events.json","paper":"https://pith.science/paper/H6UVK4VK"},"agent_actions":{"view_html":"https://pith.science/pith/H6UVK4VKPPYEE7LIUREVYPML6U","download_json":"https://pith.science/pith/H6UVK4VKPPYEE7LIUREVYPML6U.json","view_paper":"https://pith.science/paper/H6UVK4VK","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1705.07060&json=true","fetch_graph":"https://pith.science/api/pith-number/H6UVK4VKPPYEE7LIUREVYPML6U/graph.json","fetch_events":"https://pith.science/api/pith-number/H6UVK4VKPPYEE7LIUREVYPML6U/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/H6UVK4VKPPYEE7LIUREVYPML6U/action/timestamp_anchor","attest_storage":"https://pith.science/pith/H6UVK4VKPPYEE7LIUREVYPML6U/action/storage_attestation","attest_author":"https://pith.science/pith/H6UVK4VKPPYEE7LIUREVYPML6U/action/author_attestation","sign_citation":"https://pith.science/pith/H6UVK4VKPPYEE7LIUREVYPML6U/action/citation_signature","submit_replication":"https://pith.science/pith/H6UVK4VKPPYEE7LIUREVYPML6U/action/replication_record"}},"created_at":"2026-05-18T00:44:10.706400+00:00","updated_at":"2026-05-18T00:44:10.706400+00:00"}