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Rapid Commun."],"published-print":{"date-parts":[[2026,10]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    Structural color pigments based on block copolymer self\u2010assembly offer non\u2010fading color. However, their brightness and saturation are often limited by a low\u2010refractive index contrast and incoherent scattering arising from disorder. Here, we engineer non\u2010iridescent photonic pigments by incorporating ligand\u2010functionalized TiO\n                    <jats:sub>2<\/jats:sub>\n                    nanoparticles into the poly(2\u2010vinylpyridine) domains of onion\u2010like polystyrene\u2010\n                    <jats:italic>block<\/jats:italic>\n                    \u2010poly(2\u2010vinylpyridine) microspheres fabricated by emulsion\u2010confined self\u2010assembly. Thermally assisted solvent evaporation improves long\u2010range lamellar order at high nanoparticle loadings, suppressing disorder and enabling strong Bragg reflections in individual microspheres. Quantitative loading analysis reveals high incorporation efficiency up to large selective TiO\n                    <jats:sub>2<\/jats:sub>\n                    fractions. Ultra\u2010small angle X\u2010ray scattering and electron microscopy demonstrate that increasing the nanoparticle content reduces lamellar periodicity and couples refractive index enhancement to a blue\u2010shift. By combining selective swelling with molecular\u2010weight tuning, we shift the Bragg peak across the visible spectrum and fabricate pigments with enhanced saturation and luminance compared to nanoparticle\u2010free references. We use optical modeling with a transfer\u2010matrix method and Ewald\u2010sphere analysis to interpret the measurement geometry, guide the design process, and establish links between the objective numerical aperture, mode collection, and perceived coloration. These results provide practical design rules for high\u2010performance structural pigments by coupling control over ordering, scattering, and composite refractive index contrast.\n                  <\/jats:p>","DOI":"10.1002\/marc.70359","type":"journal-article","created":{"date-parts":[[2026,7,15]],"date-time":"2026-07-15T02:53:17Z","timestamp":1784083997000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Engineering Photonic Pigments From Titania\u2013Block Copolymer Composites"],"prefix":"10.1002","volume":"47","author":[{"given":"Niklas Rocca","family":"Schwarz","sequence":"first","affiliation":[{"name":"Adolphe Merkle Institute University of Fribourg Fribourg Switzerland"},{"name":"NCCR Bio\u2010inspired Materials University of Fribourg Fribourg Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jorge","family":"Larios","sequence":"additional","affiliation":[{"name":"Adolphe Merkle Institute University of Fribourg Fribourg Switzerland"},{"name":"NCCR Bio\u2010inspired Materials University of Fribourg Fribourg Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Antoine","family":"Scalabre","sequence":"additional","affiliation":[{"name":"NCCR Bio\u2010inspired Materials University of Fribourg Fribourg Switzerland"},{"name":"Department of Chemistry University of Fribourg Fribourg Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Matthias","family":"Saba","sequence":"additional","affiliation":[{"name":"Adolphe Merkle Institute University of Fribourg Fribourg Switzerland"},{"name":"NCCR Bio\u2010inspired Materials University of Fribourg Fribourg Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ullrich","family":"Steiner","sequence":"additional","affiliation":[{"name":"Adolphe Merkle Institute University of Fribourg Fribourg Switzerland"},{"name":"NCCR Bio\u2010inspired Materials University of Fribourg Fribourg Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1413-8508","authenticated-orcid":false,"given":"Andrea","family":"Dodero","sequence":"additional","affiliation":[{"name":"Adolphe Merkle Institute University of Fribourg Fribourg Switzerland"},{"name":"NCCR Bio\u2010inspired Materials University of Fribourg Fribourg Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,7,14]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.2307\/j.ctvcm4gz9"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.3788\/PI.2024.R03"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1039\/C2CS35309A"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1039\/C4CS00517A"},{"issue":"1","key":"e_1_2_9_6_1","article-title":"Formation and Optical Response of Self\u2010Assembled Gold Nanoparticle Lattices on Oxidized Silicon Synthesized Using Block Copolymers","volume":"38","author":"Alvarez\u2010Fernandez A.","year":"2020","journal-title":"Journal of Vacuum Science and Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phenomena"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1002\/adfm.202102237"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.201803478"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.882522"},{"key":"e_1_2_9_10_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202117275"},{"key":"e_1_2_9_11_1","doi-asserted-by":"publisher","DOI":"10.1146\/annurev.pc.41.100190.002521"},{"key":"e_1_2_9_12_1","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.1213055109"},{"key":"e_1_2_9_13_1","doi-asserted-by":"publisher","DOI":"10.1039\/D4SM01020E"},{"key":"e_1_2_9_14_1","doi-asserted-by":"publisher","DOI":"10.1039\/D5NR04162G"},{"key":"e_1_2_9_15_1","doi-asserted-by":"publisher","DOI":"10.1002\/smll.202205438"},{"key":"e_1_2_9_16_1","doi-asserted-by":"publisher","DOI":"10.1002\/adom.202100519"},{"key":"e_1_2_9_17_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.201707344"},{"key":"e_1_2_9_18_1","doi-asserted-by":"publisher","DOI":"10.1098\/rspa.1913.0040"},{"key":"e_1_2_9_19_1","doi-asserted-by":"publisher","DOI":"10.1021\/ja306430k"},{"key":"e_1_2_9_20_1","doi-asserted-by":"publisher","DOI":"10.1002\/smll.202001315"},{"key":"e_1_2_9_21_1","doi-asserted-by":"publisher","DOI":"10.1021\/ma500517e"},{"key":"e_1_2_9_22_1","unstructured":"International Organization for Standardization (ISO) and International Commission on Illumination (CIE) Colorimetry\u2014Part 4: CIE 1976 L*a*b* Colour Space ISO\/CIE 11664\u20104:2019 1st ed. 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