{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2022:H26PZJIXQ6W5EF6QOIZYUEVEL7","short_pith_number":"pith:H26PZJIX","canonical_record":{"source":{"id":"2202.10648","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2022-02-22T03:25:35Z","cross_cats_sorted":["physics.optics"],"title_canon_sha256":"aa52e111c51c264f2dc1891d3fcd20d12aeb15784f673338c4619e8a88f4058e","abstract_canon_sha256":"06dc5ab0bdc4ad97678aeec171a39f40351e043d539fbff4b402e91a9f29c991"},"schema_version":"1.0"},"canonical_sha256":"3ebcfca51787add217d072338a12a45fe6c854d3e5a492cadd2907e0e0d1af8d","source":{"kind":"arxiv","id":"2202.10648","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2202.10648","created_at":"2026-07-05T03:59:28Z"},{"alias_kind":"arxiv_version","alias_value":"2202.10648v2","created_at":"2026-07-05T03:59:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2202.10648","created_at":"2026-07-05T03:59:28Z"},{"alias_kind":"pith_short_12","alias_value":"H26PZJIXQ6W5","created_at":"2026-07-05T03:59:28Z"},{"alias_kind":"pith_short_16","alias_value":"H26PZJIXQ6W5EF6Q","created_at":"2026-07-05T03:59:28Z"},{"alias_kind":"pith_short_8","alias_value":"H26PZJIX","created_at":"2026-07-05T03:59:28Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2022:H26PZJIXQ6W5EF6QOIZYUEVEL7","target":"record","payload":{"canonical_record":{"source":{"id":"2202.10648","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2022-02-22T03:25:35Z","cross_cats_sorted":["physics.optics"],"title_canon_sha256":"aa52e111c51c264f2dc1891d3fcd20d12aeb15784f673338c4619e8a88f4058e","abstract_canon_sha256":"06dc5ab0bdc4ad97678aeec171a39f40351e043d539fbff4b402e91a9f29c991"},"schema_version":"1.0"},"canonical_sha256":"3ebcfca51787add217d072338a12a45fe6c854d3e5a492cadd2907e0e0d1af8d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:59:28.200871Z","signature_b64":"yoDFnMyg5uPWQhl2r33Z7hvw7pXHzmi6ykijVOnAXr2Z9m7FBnj+Obv/bVwRRE/o/KY8l1OH/HS1c/rNoKZVAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3ebcfca51787add217d072338a12a45fe6c854d3e5a492cadd2907e0e0d1af8d","last_reissued_at":"2026-07-05T03:59:28.200459Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:59:28.200459Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2202.10648","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T03:59:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2NvErI+CsI/n7PuoYwjjkvpO5H9h85vfqB2JBbD9QiivPKIA4ibtkHpFeqB0EFMenIo4SLukjDxWLhZCyA9XCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T14:26:21.629047Z"},"content_sha256":"150cbd18d476ff4f5917ca2c0a27ebba0898a563cef5bf7751fb2525bbe2e02e","schema_version":"1.0","event_id":"sha256:150cbd18d476ff4f5917ca2c0a27ebba0898a563cef5bf7751fb2525bbe2e02e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2022:H26PZJIXQ6W5EF6QOIZYUEVEL7","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Overcoming Van der Waals Forces in reconfigurable nanostructures","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.optics"],"primary_cat":"physics.app-ph","authors_text":"Alvin T. L. Tan, Anupama Sargur Ranganath, Biao Zhang, Dong Wang, Hailong Liu, Hao Wang, Hongtao Wang, Hong Yee Low, Joel K.W. Yang, John You En Chan, Qifeng Ruan, Son Tung Ha, Venkat K. Ravikumar, Wang Zhang","submitted_at":"2022-02-22T03:25:35Z","abstract_excerpt":"Reconfigurable metamaterials require constituent nanostructures to demonstrate switching of shapes with external stimuli. For generality, such nanostructures would touch and stick to other surfaces in one of its configurations. Yet, a longstanding challenge is in overcoming this stiction caused by Van der Waals forces, which impedes shape recovery. Here, we introduce a stiff yet self-recovering material system based on acrylic acid, and tested it in high-aspect ratio structures, where recovery is weak. This designer material has a storage modulus of ~5.2 GPa at room temperature and ~90 MPa in "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2202.10648","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2202.10648/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T03:59:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nrOTSqca24iAapybdERDTZA5earzAsG7NwuQIjThodXGx8gHfBWfIbLR/lHHrtVrj2qGYBBpL+KZ00Ybl6stCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T14:26:21.629437Z"},"content_sha256":"28e404d3d2b1ec726bc0cd7af3be790707b1565779d07350e23727cee58094ce","schema_version":"1.0","event_id":"sha256:28e404d3d2b1ec726bc0cd7af3be790707b1565779d07350e23727cee58094ce"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/H26PZJIXQ6W5EF6QOIZYUEVEL7/bundle.json","state_url":"https://pith.science/pith/H26PZJIXQ6W5EF6QOIZYUEVEL7/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/H26PZJIXQ6W5EF6QOIZYUEVEL7/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-07-07T14:26:21Z","links":{"resolver":"https://pith.science/pith/H26PZJIXQ6W5EF6QOIZYUEVEL7","bundle":"https://pith.science/pith/H26PZJIXQ6W5EF6QOIZYUEVEL7/bundle.json","state":"https://pith.science/pith/H26PZJIXQ6W5EF6QOIZYUEVEL7/state.json","well_known_bundle":"https://pith.science/.well-known/pith/H26PZJIXQ6W5EF6QOIZYUEVEL7/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2022:H26PZJIXQ6W5EF6QOIZYUEVEL7","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"06dc5ab0bdc4ad97678aeec171a39f40351e043d539fbff4b402e91a9f29c991","cross_cats_sorted":["physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2022-02-22T03:25:35Z","title_canon_sha256":"aa52e111c51c264f2dc1891d3fcd20d12aeb15784f673338c4619e8a88f4058e"},"schema_version":"1.0","source":{"id":"2202.10648","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2202.10648","created_at":"2026-07-05T03:59:28Z"},{"alias_kind":"arxiv_version","alias_value":"2202.10648v2","created_at":"2026-07-05T03:59:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2202.10648","created_at":"2026-07-05T03:59:28Z"},{"alias_kind":"pith_short_12","alias_value":"H26PZJIXQ6W5","created_at":"2026-07-05T03:59:28Z"},{"alias_kind":"pith_short_16","alias_value":"H26PZJIXQ6W5EF6Q","created_at":"2026-07-05T03:59:28Z"},{"alias_kind":"pith_short_8","alias_value":"H26PZJIX","created_at":"2026-07-05T03:59:28Z"}],"graph_snapshots":[{"event_id":"sha256:28e404d3d2b1ec726bc0cd7af3be790707b1565779d07350e23727cee58094ce","target":"graph","created_at":"2026-07-05T03:59:28Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2202.10648/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Reconfigurable metamaterials require constituent nanostructures to demonstrate switching of shapes with external stimuli. For generality, such nanostructures would touch and stick to other surfaces in one of its configurations. Yet, a longstanding challenge is in overcoming this stiction caused by Van der Waals forces, which impedes shape recovery. Here, we introduce a stiff yet self-recovering material system based on acrylic acid, and tested it in high-aspect ratio structures, where recovery is weak. This designer material has a storage modulus of ~5.2 GPa at room temperature and ~90 MPa in ","authors_text":"Alvin T. L. Tan, Anupama Sargur Ranganath, Biao Zhang, Dong Wang, Hailong Liu, Hao Wang, Hongtao Wang, Hong Yee Low, Joel K.W. Yang, John You En Chan, Qifeng Ruan, Son Tung Ha, Venkat K. Ravikumar, Wang Zhang","cross_cats":["physics.optics"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2022-02-22T03:25:35Z","title":"Overcoming Van der Waals Forces in reconfigurable nanostructures"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2202.10648","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:150cbd18d476ff4f5917ca2c0a27ebba0898a563cef5bf7751fb2525bbe2e02e","target":"record","created_at":"2026-07-05T03:59:28Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"06dc5ab0bdc4ad97678aeec171a39f40351e043d539fbff4b402e91a9f29c991","cross_cats_sorted":["physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2022-02-22T03:25:35Z","title_canon_sha256":"aa52e111c51c264f2dc1891d3fcd20d12aeb15784f673338c4619e8a88f4058e"},"schema_version":"1.0","source":{"id":"2202.10648","kind":"arxiv","version":2}},"canonical_sha256":"3ebcfca51787add217d072338a12a45fe6c854d3e5a492cadd2907e0e0d1af8d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3ebcfca51787add217d072338a12a45fe6c854d3e5a492cadd2907e0e0d1af8d","first_computed_at":"2026-07-05T03:59:28.200459Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:59:28.200459Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"yoDFnMyg5uPWQhl2r33Z7hvw7pXHzmi6ykijVOnAXr2Z9m7FBnj+Obv/bVwRRE/o/KY8l1OH/HS1c/rNoKZVAg==","signature_status":"signed_v1","signed_at":"2026-07-05T03:59:28.200871Z","signed_message":"canonical_sha256_bytes"},"source_id":"2202.10648","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:150cbd18d476ff4f5917ca2c0a27ebba0898a563cef5bf7751fb2525bbe2e02e","sha256:28e404d3d2b1ec726bc0cd7af3be790707b1565779d07350e23727cee58094ce"],"state_sha256":"7f2037ec1f8d8c09a13ea78407f39a479f27aad8c7cf2b627733ae08e57c9ba2"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vE6TnnW/mXaFvb7CWgY9tUwHUcmmWPqsLc8K3+c9YBwltKP480iSONmyciyg64+aVubnctf71RaOfsqtmC4SDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-07T14:26:21.631511Z","bundle_sha256":"e82ecad76e5c80c1487a1d62d55ac35449f13fd980be7bfb13735f0e984f68ec"}}