扫描隧道显微镜（STM）靠什么“看见”原子？
How does STM 'see' atoms?
针尖与样品间的隧穿电流随间距指数变化，可对表面电子态成像，甚至移动单个原子。
The tunneling current between tip and sample is exponentially sensitive to distance, imaging surface electron states and even moving single atoms.
难度 专业 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#STM #隧穿 #表面
为什么硅胶能吸潮？
Why does silica gel absorb moisture?
硅胶多孔，表面能吸附大量水分子。
Silica gel is porous and adsorbs many water molecules on its surface.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
傅献彩 等,《物理化学》第5版,高等教育出版社,2005
Fu Xiancai et al., Physical Chemistry, 5th ed., Higher Education Press, 2005
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040167696（按标识回读: 物理化学(第五版)上册）
#硅胶 #吸附 #干燥
朗缪尔吸附等温式假设什么？
What does the Langmuir adsorption isotherm assume?
它假设单层、位点均匀、吸附质间无相互作用；覆盖度 θ=KP/(1+KP) 随压力增大而饱和。
It assumes a monolayer, uniform sites and no adsorbate interactions; coverage θ=KP/(1+KP) saturates as pressure rises.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#朗缪尔 #吸附 #单层
净水器和防毒面具里的活性炭为什么能吸附杂质？
Why does activated carbon in purifiers and masks trap impurities?
活性炭有大量微米级孔隙，表面积极大，靠物理吸附把气体分子或色素困在孔隙里。
Activated carbon has huge microscopic surface area from pores, physically adsorbing gas molecules or pigments into them.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
傅献彩 等,《物理化学》第5版,高等教育出版社,2005
Fu Xiancai et al., Physical Chemistry, 5th ed., Higher Education Press, 2005
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040167696（按标识回读: 物理化学(第五版)上册）
#活性炭 #吸附 #净水
为什么肥皂能去污？
Why does soap remove dirt?
肥皂分子一头亲水一头亲油，能把油污包成小滴随水冲走。
Soap molecules grab oil and let water carry it away.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
傅献彩 等,《物理化学》第5版,高等教育出版社,2005
Fu Xiancai et al., Physical Chemistry, 5th ed., Higher Education Press, 2005
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040167696（按标识回读: 物理化学(第五版)上册）
#表面张力 #乳化 #油污
肥皂为什么能洗掉油污？
Why does soap remove grease?
肥皂是脂肪酸盐，分子一端亲水（羧酸根），另一端是长链疏水烃基。在水中，疏水端插入油滴、亲水端留在水里，形成胶束把油污包在内部，使油污被水冲走。胶束外壳亲水、内核疏水，油污因此能稳定地悬浮在水中。
Soap is a fatty-acid salt with a hydrophilic carboxylate head and a long hydrophobic hydrocarbon tail. In water, the tails embed in grease while the heads stay in the water, building micelles that encapsulate the oil so it can be rinsed away. Because the micelle has a hydrophilic shell and hydrophobic interior, the grease stays suspended in water.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
《普通化学》(Atkins) 表面活性剂章节
General Chemistry (Atkins), surfactants; Royal Society of Chemistry
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL8206954W：General Chemistry Ise A
#胶束 #表面活性剂 #去污
乳化剂为什么能让油和水混合？
Why can emulsifiers mix oil and water?
乳化剂是两性分子，亲水头伸入水相、亲油尾伸入油相，降低油水界面张力并在液滴表面形成膜，阻止其聚并，从而稳定乳液（如蛋黄中的卵磷脂稳定蛋黄酱）。
Emulsifiers are amphiphilic: hydrophilic heads face water and lipophilic tails face oil, lowering interfacial tension and forming a film around droplets that prevents coalescence, stabilizing emulsions (e.g., lecithin in egg yolk stabilizes mayonnaise).
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#乳化剂 #两性分子 #乳液
接触角滞后现象是如何产生的,前进角和后退角之差反映了界面的什么性质?
What causes contact angle hysteresis, and what does the difference between advancing and receding angles reflect about an interface?
当液体在三相线上移动时,表面化学不均匀性和微米/纳米级粗糙度会钉扎三相线,使润湿存在多个亚稳态。缓慢加液测得的前进角对应能量势垒较高的一侧,缓慢抽液测得的后退角对应另一侧,两者之差即滞后。滞后越大说明表面越"脏"或粗糙度梯度越大,因此它常被用作表面均匀性与洁净度的敏感判据。
As the three-phase contact line moves, chemical heterogeneity and micro/nanoscale roughness pin it, creating many metastable wetting states. Slowly adding liquid yields the advancing angle on the high-barrier side; slowly withdrawing gives the receding angle on the opposite side, and their gap is the hysteresis. Larger hysteresis signals greater contamination or roughness gradients, so it serves as a sensitive probe of surface uniformity and cleanliness.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
de Gennes《Capillarity and Wetting Phenomena》第四章滞后与接触角去钉扎讨论, 2004
P.-G. de Gennes et al., Capillarity and Wetting Phenomena, Springer, 2004, Ch. 4 on hysteresis and depinning
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-387-00592-8 (2004, Springer)
#接触角 #润湿性
水滴在荷叶上滚动时,前缘和后缘的接触角并不相同,这背后是什么界面现象?
When a water droplet rolls across a lotus leaf, its leading and trailing edges meet the surface at different angles — what interfacial phenomenon lies behind this?
前进角大于后退角,两者之差称为接触角滞后,来源于表面化学组成的不均一与微纳粗糙结构对三相接触线的钉扎。在Cassie-Baxter复合润湿态下,截留的空气进一步放大这种前后不对称。滞后足够小时液滴便能轻易滚离并携带尘粒,这就是自清洁的界面学基础。
The advancing angle exceeds the receding angle, and their gap is the contact angle hysteresis, rooted in chemical heterogeneity plus pinning of the three-phase contact line by micro/nano roughness. In the Cassie-Baxter composite state the trapped air amplifies this fore-aft asymmetry further. Once hysteresis is small enough, drops roll off readily and carry dust away — the interfacial basis of self-cleaning.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
P.-G. de Gennes《Wetting: statics and dynamics》,Reviews of Modern Physics 57 (1985) 827
P.-G. de Gennes, Wetting: statics and dynamics, Reviews of Modern Physics 57 (1985) 827
独立核验依据 · Independent verification: 核验依据 1 CROSSREF 标识 10.1103/revmodphys.57.827：Wetting: statics a
#接触角滞后 #自清洁效应
往水里加一点点十二烷基硫酸钠,表面张力就骤降,可继续加却几乎不再变化,这条曲线的转折点意味着什么?
A pinch of sodium dodecyl sulfate slashes the surface tension of water, yet adding more barely moves it afterward — what does the turning point on that curve signify?
两亲分子优先占据气液界面:硫酸根基团留在水中,十二条碳的长尾探向空气,替换掉一部分表面能很高的裸露水面,Gibbs吸附等温式定量描述了这一界面富集过程。当浓度抵达临界胶束浓度(约8 mmol/L),界面已经饱和,新增分子只能转入体相聚集成胶束,表面张力随之走平。胶束同时充当油污的容器,这正是洗涤剂增溶作用的出发点。
Amphiphiles crowd preferentially onto the air-water interface: sulfate heads stay submerged while twelve-carbon tails reach for air, displacing bare high-energy water surface, a process Gibbs adsorption isotherms quantify. Once concentration reaches the critical micelle concentration near 8 millimolar the interface saturates, newcomers can only aggregate into bulk micelles, and surface tension flattens out. Those micelles double as containers for oily soil — the starting point of detergent solubilization.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
M. J. Rosen 与 J. T. Kunjappu《Surfactants and Interfacial Phenomena》第4版,Wiley,2012
M. J. Rosen and J. T. Kunjappu, Surfactants and Interfacial Phenomena, 4th ed., Wiley, 2012
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-1-118-22902-6 (2012, Wiley)
#表面过剩 #胶束化
铝比铁活泼得多，为什么日常生活中铝制品却几乎不生锈？
Since aluminum is far more reactive than iron, why does it hardly ever corrode in daily life?
因为铝有很强的钝化本领。新暴露的铝一接触空气便立即与氧化合，生成仅几纳米厚的致密氧化铝膜，它结合牢固、无缝隙地盖住表面，切断氧气和水汽进入内部的通道，使腐蚀停留在表层；即使被划伤，膜也会在空气中迅速重建。不锈钢抗锈同理，靠铬形成富铬钝化膜。而铁的锈层疏松多孔，无法隔离内部，腐蚀才不断向深处推进。
Aluminum protects itself with a passive film. The moment freshly exposed metal meets air it oxidizes into an alumina layer only a few nanometers thick, which clings tightly and covers the surface completely, denying oxygen and moisture any path to the metal underneath; scratched spots repair themselves almost at once. Stainless steel works the same way through a chromium-rich passive film. Ordinary iron, by contrast, grows loose porous rust that shields nothing, so the attack digs ever deeper.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
M. G. Fontana，《腐蚀工程（Corrosion Engineering）》第3版，McGraw-Hill，1986
M. G. Fontana, Corrosion Engineering, 3rd edition, McGraw-Hill, 1986
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-07-100360-5 (1986, McGraw-Hill)
#金属钝化 #致密氧化膜 #不锈钢
为什么零食袋里的小包能吸水，有的还会变色？
Why do the little packets in snacks absorb water, some even changing color?
硅胶多孔，靠物理吸附吸水防潮；有的掺氯化钴，无水时蓝、吸水后变粉红，用来指示湿度。
Silica gel's pores physically adsorb moisture; some is doped with cobalt chloride that is blue when dry, pink when wet, indicating humidity.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
傅献彩 等,《物理化学》第5版,高等教育出版社,2005
Fu Xiancai et al., Physical Chemistry, 5th ed., Higher Education Press, 2005
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040167696（按标识回读: 物理化学(第五版)上册）
#硅胶 #干燥剂 #吸附
研磨药品为什么用研钵和杵？
Why grind chemicals with a mortar and pestle?
研磨把固体磨细，增大表面积，使后续溶解或反应更快更充分。
Grinding increases surface area, speeding up and improving dissolution or reaction.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
傅献彩 等,《物理化学》第5版,高等教育出版社,2005
Fu Xiancai et al., Physical Chemistry, 5th ed., Higher Education Press, 2005
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040167696（按标识回读: 物理化学(第五版)上册）
#研磨 #表面积 #实验室
为什么水银洒地变成小圆珠乱滚？
Why does spilled mercury form rolling beads?
汞内聚力（金属键）远大于它与玻璃等的附着力，表面张力大，所以缩成圆珠；汞有毒，泄漏要用硫粉覆盖处理。
Mercury's cohesion (metallic bonding) far exceeds adhesion to surfaces, and high surface tension makes it ball up; it's toxic, so spills are covered with sulfur powder.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
傅献彩 等,《物理化学》第5版,高等教育出版社,2005
Fu Xiancai et al., Physical Chemistry, 5th ed., Higher Education Press, 2005
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040167696（按标识回读: 物理化学(第五版)上册）
#汞 #表面张力 #有毒
表面活性剂为什么能降低表面张力？
Why can surfactants lower surface tension?
它们富集在界面，用疏水尾顶替表面分子，减弱表面的净吸引力，使润湿和铺展更容易。
They accumulate at interfaces, replacing surface molecules with hydrophobic tails and weakening net surface attraction, easing wetting and spreading.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#表面活性剂 #表面张力 #界面
肥皂泡为什么是圆的,还会飘在天上不掉下来?
Why are soap bubbles round and floating in the air?
泡泡皮想让自己最省力,而圆球形用的「皮」最少、装得气最多,所以泡泡总是圆圆的。它那么轻,风一吹就飘起来了。对着它轻轻看,还能看见彩虹的颜色在上面流动呢!
Bubble skin wants the laziest shape: a sphere uses least skin for most air, so bubbles stay round. They weigh almost nothing so breezes carry them up. Look closely and rainbow colors swim across the surface!
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 2 条独立证据
来源 · Source
《十万个为什么》第六版化学分册,少年儿童出版社,2013
Ten Thousand Whys: Chemistry volume, 6th ed., Juvenile and Children Publishing House, 2013
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-7-5324-9328-9 · 核验依据 2 ISBN 9787532493289
#肥皂泡 #圆形 #表面张力
装过番茄酱的塑料盒为什么染上洗不掉的红色？
Why do plastic containers stay stained red after tomato sauce?
番茄里的番茄红素等色素会渗进塑料微小的孔隙里，所以很难洗掉。
Lycopene and other pigments seep into the tiny pores of plastic, making stains hard to wash out.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
傅献彩 等,《物理化学》第5版,高等教育出版社,2005
Fu Xiancai et al., Physical Chemistry, 5th ed., Higher Education Press, 2005
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040167696（按标识回读: 物理化学(第五版)上册）
#塑料 #色素 #吸附
肥皂是怎么做出来的，为什么能去油？
How is soap made, and why does it remove grease?
用碱(氢氧化钠)煮动植物油脂得到脂肪酸钠(皂化)；它一头亲水、一头亲油，能把油污包成胶束随水冲走。
Boiling fats with alkali (NaOH) yields sodium fatty-acid salts (saponification); one end loves water, one loves oil, so it wraps grease into micelles washed away.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
傅献彩 等,《物理化学》第5版,高等教育出版社,2005
Fu Xiancai et al., Physical Chemistry, 5th ed., Higher Education Press, 2005
独立核验依据 · Independent verification: 核验依据 2 DOUBAN ISBN 标识 9787040167696（按标识回读: 物理化学(第五版)上册）
#肥皂 #皂化 #胶束