{"created":"2025-06-12T00:27:22.275882+00:00","id":2000342,"links":{},"metadata":{"_buckets":{"deposit":"e44f0374-f646-4a3d-92f4-f9726b211da2"},"_deposit":{"created_by":20,"id":"2000342","owner":"20","owners":[20],"pid":{"revision_id":0,"type":"depid","value":"2000342"},"status":"published"},"_oai":{"id":"oai:muroran-it.repo.nii.ac.jp:02000342","sets":["41:227"]},"author_link":[],"item_1716854901627":{"attribute_name":"日付","attribute_value_mlt":[{"subitem_date_issued_datetime":"2028-04-01","subitem_date_issued_type":"Available"}]},"item_81_date_granted_17":{"attribute_name":"学位授与年月日","attribute_value_mlt":[{"subitem_dategranted":"2025-03-24"}]},"item_81_degree_grantor_10":{"attribute_name":"学位授与機関","attribute_value_mlt":[{"subitem_degreegrantor":[{"subitem_degreegrantor_language":"ja","subitem_degreegrantor_name":"室蘭工業大学"},{"subitem_degreegrantor_language":"en","subitem_degreegrantor_name":"Muroran Institute of Technology"}],"subitem_degreegrantor_identifier":[{"subitem_degreegrantor_identifier_name":"10103","subitem_degreegrantor_identifier_scheme":"kakenhi"}]}]},"item_81_degree_name_11":{"attribute_name":"学位名","attribute_value_mlt":[{"subitem_degreename":"博士（工学）","subitem_degreename_language":"ja"}]},"item_81_description_7":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"本論文では、環境科学、産業、生物学の各分野における応用が期待される発光性ナノ材料\nの合成と物理化学的な特性の研究を行った。\nピレンをドープしたシリカナノ粒子（PSNPs）をマイクロエマルション法を用いて合成し\nた。ナノ粒子は平均サイズ約72 nm の球状であり、エキシマー発光を示した。蛍光量子収率\nは27%であった。PSNPs の蛍光特性が水中酸素濃度によって変化することを明らかにし、溶\n存酸素濃度の測定や水質モニタリングのためのセンサーとしての応用が期待される。さら\nに光励起により一重項酸素が発生することを明らかにし、光触媒作用や抗菌作用への応用\nの可能性が示された。\n窒素雰囲気下で様々な温度でシリカナノ粒子を焼成して室温リン光発光材料を作成した。\n合成した材料に365 nm の励起光を照射するとリン光を肉眼でも確認できた。発光のメカニ\nズムとして、シリカマトリックス中に存在する炭素原子により生成する欠陥に起因した発\n光の可能性がある。本研究で開発したナノ粒子は、長寿命の発光を示す安定な材料としてバ\nイオイメージング、バイオセンシング、偽造防止技術などへの応用が考えられる。\nリン酸カルシウムに蛍光発光体としてカーボンドット（CDs）を包含することにより、蛍\n光性リン酸カルシウムを作成した。カルシウム源として様々なカルシウム塩、およびリン酸\nを使用し、共沈法により蛍光性リン酸カルシウムを作成した。XRD およびFTIR によりブル\nシャイトおよびハイドロキシアパタイトの生成を確認した。365 nm の励起光で光励起する\nとCDs 由来の青色の蛍光が観測された。本研究で作成した蛍光ナノ材料は、生体適合性、生\n分解性を有していることから、バイオイメージングやバイオセンシングへの応用に理想的\nな材料であると考えられる。\n総括として、本研究では発光性ナノ材料を合成し、その構造および物理化学的な特性の評\n価を行い、多機能性と安定性を有することを明らかにした。多機能性と安定性を材料に付与\nすることは材料工学の分野における重要な課題であると考えられる。また本研究で合成さ\nれたナノ材料は、生物学において酸素センシング、バイオイメージングなどへの応用が期\n待されるとともに、光触媒反応を利用した工業廃水処理などを通して実社会における応用\nの可能性が示されている。","subitem_description_language":"ja","subitem_description_type":"Abstract"},{"subitem_description":"The synthesis and photophysical properties of various luminescent nanomaterials\nwith potential applications across environmental, industrial, and biomedical\nfields were studied.\nPyrene-doped silica nanoparticles (PSNPs) were synthesized using a water-in-oil\nmicroemulsion method, embedding pyrene within a silica matrix. Characterization\ntechniques confirmed the formation of spherical particles with an average size of\n72 nm and a quantum yield of 27% for excimer emission. The fluorescence property\nof PSNPs changed with oxygen concentration dissolved in water, enabling oxygen\nmonitoring, which is beneficial for measuring dissolved oxygen concentration,\nmonitoring water quality and so on. The singlet oxygen generation upon\nphotoexcitation highlights their potential in photocatalysis and antibacterial\napplications.\nRoom temperature phosphorescence (RTP) materials were prepared using silica\nnanoparticles heated under a nitrogen atmosphere at various temperatures. The\nnanoparticles showed RTP which was visible to the naked eye after the excitation\nlight at 365 nm was turned off. This RTP may be attributed to carbon substitutional\ndefects within the silica lattice. Stable long-lasting luminescence of\nnanoparticles prepared in this study is suitable for applications in bioimaging,\nbiosensing, and anti-counterfeiting technologies.\nFluorescent calcium phosphates were prepared by encapsulating carbon dots (CDs) as\nfluorescent emitters. Using calcium salts as calcium sources, and phosphoric acid,\nthe fluorescent calcium phosphates were produced via a co-precipitation method.\nXRD and FTIR confirmed the formation of brushite and hydroxyapatite. The calcium\nphosphates exhibited blue fluorescence under the excitation light at 365 nm,\noriginating from the CDs. Their biocompatibility and fluorescence characteristics\nmake them suitable for biomedical applications, particularly in bioimaging and\nbiosensing, where materials need to be safe, degradable, and interact well with\nbiological systems.\nOverall, advanced luminescent nanomaterials which were synthesized and\ncharacterized in this study possess multifunctionality and stability. These are\nchallenging properties in the field of materials engineering. The nanomaterials\nsynthesized in this study show potential for real-world applications such as\noxygen sensing and bioimaging in biology, and waste water treatment using\nphotocatalysis reactions in industry.","subitem_description_language":"en","subitem_description_type":"Abstract"}]},"item_81_dissertation_number_13":{"attribute_name":"学位授与番号","attribute_value_mlt":[{"subitem_dissertationnumber":"甲第546号"}]},"item_81_text_12":{"attribute_name":"学位の種別","attribute_value_mlt":[{"subitem_text_language":"ja","subitem_text_value":"課程博士"}]},"item_81_text_14":{"attribute_name":"報告番号","attribute_value_mlt":[{"subitem_text_language":"ja","subitem_text_value":"甲第546号"}]},"item_81_text_15":{"attribute_name":"学位記番号","attribute_value_mlt":[{"subitem_text_language":"ja","subitem_text_value":"博甲第546号"}]},"item_81_text_16":{"attribute_name":"研究科・専攻","attribute_value_mlt":[{"subitem_text_language":"ja","subitem_text_value":"工学研究科"}]},"item_81_version_type_24":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"embargoed access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_f1cf"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorAffiliations":[{"affiliationNames":[{"affiliationName":"室蘭工業大学","affiliationNameLang":"ja"},{"affiliationName":"Muroran Institute of Technology","affiliationNameLang":"en"}]}],"creatorNames":[{"creatorName":"Noor, E Ashrafi","creatorNameLang":"en"}],"familyNames":[{"familyName":"Noor","familyNameLang":"en"}],"givenNames":[{"givenName":"E Ashrafi","givenNameLang":"en"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2028-04-01"}],"filename":"A546.pdf","filesize":[{"value":"7.5 MB"}],"format":"application/pdf","url":{"objectType":"fulltext","url":"https://muroran-it.repo.nii.ac.jp/record/2000342/files/A546.pdf"},"version_id":"1f393d2b-8fcd-4607-a27c-6a0485c5dc91"},{"accessrole":"open_access","date":[{"dateType":"Available","dateValue":"2025-06-12"}],"filename":"A546_summary.pdf","filesize":[{"value":"131 KB"}],"format":"application/pdf","url":{"objectType":"abstract","url":"https://muroran-it.repo.nii.ac.jp/record/2000342/files/A546_summary.pdf"},"version_id":"18cfca6e-cd54-4d98-b78d-aa5b3229e861"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"doctoral thesis","resourceuri":"http://purl.org/coar/resource_type/c_db06"}]},"item_title":"Synthesis and Physical Chemistry of Luminescent Nanomaterials: Dye-Doped and Dye-Free Silica Nanoparticles and Carbon Dot- Encapsulated Calcium Phosphate Salts","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Synthesis and Physical Chemistry of Luminescent Nanomaterials: Dye-Doped and Dye-Free Silica Nanoparticles and Carbon Dot- Encapsulated Calcium Phosphate Salts","subitem_title_language":"en"},{"subitem_title":"発光ナノ材料の合成と物理化学：色素をドーピングおよび色素をド ーピングしないシリカナノ粒子、ならびにカーボンドットを包含した リン酸カルシウム","subitem_title_language":"ja"}]},"item_type_id":"81","owner":"20","path":["227"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2025-06-12"},"publish_date":"2025-06-12","publish_status":"0","recid":"2000342","relation_version_is_last":true,"title":["Synthesis and Physical Chemistry of Luminescent Nanomaterials: Dye-Doped and Dye-Free Silica Nanoparticles and Carbon Dot- Encapsulated Calcium Phosphate Salts"],"weko_creator_id":"20","weko_shared_id":-1},"updated":"2025-06-12T00:38:43.867549+00:00"}