{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2015:KEMSB3UGVPQADY3NOOLYEQA7DR","short_pith_number":"pith:KEMSB3UG","schema_version":"1.0","canonical_sha256":"511920ee86abe001e36d739782401f1c4bcc4d17fd3344fa46b2307135c057a4","source":{"kind":"arxiv","id":"1509.07889","version":1},"attestation_state":"computed","paper":{"title":"Isotropic Negative Thermal Expansion Metamaterials","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Bo Li, Ji Zhou, Lingling Wu","submitted_at":"2015-09-24T15:13:22Z","abstract_excerpt":"Negative thermal expansion materials are important and desirable in science and engineering applications. However, natural materials with isotropic negative thermal expansion are rare and usually unsatisfied in performance. Here, we propose a novel method to achieve negative thermal expansion via a metamaterial approach. The metamaterial is constructed with unit cells that combine bi-material strips and anti-chiral structures. Both experimental and simulation results display isotropic negative thermal expansion properties. The coefficient of negative thermal expansion of the metamaterials is d"},"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":"1509.07889","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-09-24T15:13:22Z","cross_cats_sorted":[],"title_canon_sha256":"a06b1eda62fef39c7ae8ea10c79fab54c2e6afeb1a53e13613b7b1332f44ba9a","abstract_canon_sha256":"5aaccbb4c9d97d21e81f01a66b44c302fc30e4e603d6013d556b78b16cc5640c"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:31:59.825478Z","signature_b64":"jo+FAYssHBG7+hVsAAqcXiayQ1Z05klnm9GgBwGPqe0aGKGjp5n+d66+QgLvPw3T/D9o7ul6p3/avXlSzZXdCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"511920ee86abe001e36d739782401f1c4bcc4d17fd3344fa46b2307135c057a4","last_reissued_at":"2026-05-18T01:31:59.824921Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:31:59.824921Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Isotropic Negative Thermal Expansion Metamaterials","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Bo Li, Ji Zhou, Lingling Wu","submitted_at":"2015-09-24T15:13:22Z","abstract_excerpt":"Negative thermal expansion materials are important and desirable in science and engineering applications. However, natural materials with isotropic negative thermal expansion are rare and usually unsatisfied in performance. Here, we propose a novel method to achieve negative thermal expansion via a metamaterial approach. The metamaterial is constructed with unit cells that combine bi-material strips and anti-chiral structures. Both experimental and simulation results display isotropic negative thermal expansion properties. The coefficient of negative thermal expansion of the metamaterials is d"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.07889","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":"1509.07889","created_at":"2026-05-18T01:31:59.824993+00:00"},{"alias_kind":"arxiv_version","alias_value":"1509.07889v1","created_at":"2026-05-18T01:31:59.824993+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.07889","created_at":"2026-05-18T01:31:59.824993+00:00"},{"alias_kind":"pith_short_12","alias_value":"KEMSB3UGVPQA","created_at":"2026-05-18T12:29:27.538025+00:00"},{"alias_kind":"pith_short_16","alias_value":"KEMSB3UGVPQADY3N","created_at":"2026-05-18T12:29:27.538025+00:00"},{"alias_kind":"pith_short_8","alias_value":"KEMSB3UG","created_at":"2026-05-18T12:29:27.538025+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/KEMSB3UGVPQADY3NOOLYEQA7DR","json":"https://pith.science/pith/KEMSB3UGVPQADY3NOOLYEQA7DR.json","graph_json":"https://pith.science/api/pith-number/KEMSB3UGVPQADY3NOOLYEQA7DR/graph.json","events_json":"https://pith.science/api/pith-number/KEMSB3UGVPQADY3NOOLYEQA7DR/events.json","paper":"https://pith.science/paper/KEMSB3UG"},"agent_actions":{"view_html":"https://pith.science/pith/KEMSB3UGVPQADY3NOOLYEQA7DR","download_json":"https://pith.science/pith/KEMSB3UGVPQADY3NOOLYEQA7DR.json","view_paper":"https://pith.science/paper/KEMSB3UG","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1509.07889&json=true","fetch_graph":"https://pith.science/api/pith-number/KEMSB3UGVPQADY3NOOLYEQA7DR/graph.json","fetch_events":"https://pith.science/api/pith-number/KEMSB3UGVPQADY3NOOLYEQA7DR/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/KEMSB3UGVPQADY3NOOLYEQA7DR/action/timestamp_anchor","attest_storage":"https://pith.science/pith/KEMSB3UGVPQADY3NOOLYEQA7DR/action/storage_attestation","attest_author":"https://pith.science/pith/KEMSB3UGVPQADY3NOOLYEQA7DR/action/author_attestation","sign_citation":"https://pith.science/pith/KEMSB3UGVPQADY3NOOLYEQA7DR/action/citation_signature","submit_replication":"https://pith.science/pith/KEMSB3UGVPQADY3NOOLYEQA7DR/action/replication_record"}},"created_at":"2026-05-18T01:31:59.824993+00:00","updated_at":"2026-05-18T01:31:59.824993+00:00"}